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Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

MAGNESIUM MONO POTASSIUM PHOSPHATE GROUT FOR P-REACTOR VESSEL IN-SITU DECOMISSIONING  

SciTech Connect

The objective of this report is to document laboratory testing of magnesium mono potassium phosphate grouts for P-Reactor vessel in-situ decommissioning. Magnesium mono potassium phosphate cement-based grout was identified as candidate material for filling (physically stabilizing) the 105-P Reactor vessel (RV) because it is less alkaline than portland cement-based grout (pH of about 12.4). A less alkaline material ({<=} 10.5) was desired to address a potential materials compatibility issue caused by corrosion of aluminum metal in highly alkaline environments such as that encountered in portland cement grouts. Information concerning access points into the P-Reactor vessel and amount of aluminum metal in the vessel is provided elsewhere. Fresh and cured properties were measured for: (1) commercially blended magnesium mono potassium phosphate packaged grouts, (2) commercially available binders blended with inert fillers at SRNL, (3) grouts prepared from technical grade MgO and KH{sub 2}PO{sub 4} and inert fillers (quartz sands, Class F fly ash), and (4) Ceramicrete{reg_sign} magnesium mono potassium phosphate-based grouts prepared at Argonne National Laboratory. Boric acid was evaluated as a set retarder in the magnesium mono potassium phosphate mixes.

Langton, C.; Stefanko, D.

2011-01-05T23:59:59.000Z

2

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

E-Print Network (OSTI)

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...

Landua, Dennis Paul

2012-06-07T23:59:59.000Z

3

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

E-Print Network (OSTI)

allow a more adequate evaluation of the K status of an animal. Magnesium (Mg) absorption is depressed when animals are fed high levels of K (Greene, 1983a, b, c; Field and Suttle, 1979; MacGregor and Armstrong, 1979; Thomas and Potter, 1976; Suttle... reserves of K in contrast to the bone reserves of Ca, Mg, Na or P. The normal kidney functions to remove excess K from the plasma and even under dangerously low body K concentrations, renal excretion of X continues. Cowan and Phillips (1973) observed a...

Poe, Julie Hamilton

1984-01-01T23:59:59.000Z

4

Metals in the sporulation phosphorelay: manganese binding by the response regulator Spo0F  

Science Journals Connector (OSTI)

This paper reports the crystal structure of the response regulator Spo0F in complex with manganese and explores the differing possibilities for the involvement of manganese and magnesium in the phosphoryl transfer.

Mukhopadhyay, D.

2004-03-23T23:59:59.000Z

5

Femtosecond laser-induced modification of potassium-magnesium silicate glasses: An analysis of structural changes by near edge x-ray absorption spectroscopy  

SciTech Connect

The effects of femtosecond laser pulse irradiation on the glass structure of alkaline silicate glasses were investigated by x-ray absorption near edge structure spectroscopy using the beamline of the Physikalisch-Technische Bundesanstalt at the electron synchrotron BESSY II in Berlin (Germany) by analyzing the magnesium K-edge absorption peak for different laser fluences. The application of fluences above the material modification threshold (2.1 J/cm{sup 2}) leads to a characteristic shift of {approx}1.0 eV in the K-edge revealing a reduced ({approx}3%) mean magnesium bond length to the ligated oxygen ions (Mg-O) along with a reduced average coordination number of the Mg ions.

Seuthe, T.; Eberstein, M. [Fraunhofer-Institut fuer Keramische Technologien und Systeme (IKTS), Winterbergstrasse 28, 01277 Dresden (Germany); Hoefner, M.; Eichler, H. J.; Grehn, M. [Technische Universitaet Berlin, Institut fuer Optik und Atomare Physik, Strasse des 17. Juni 135, 10623 Berlin (Germany); Reinhardt, F. [Physikalisch-Technische Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin (Germany); Tsai, W. J. [ITRI South, Industrial Technology Research Institute, 8 Gongyan Rd., Liu-jia District, Tainan City 73445, Taiwan (China); Bonse, J. [BAM Bundesanstalt fuer Materialforschung und - pruefung, Unter den Eichen 87, 12205 Berlin (Germany)

2012-05-28T23:59:59.000Z

6

A SEARCH FOR MAGNESIUM IN EUROPA'S ATMOSPHERE  

SciTech Connect

Europa's tenuous atmosphere results from sputtering of the surface. The trace element composition of its atmosphere is therefore related to the composition of Europa's surface. Magnesium salts are often invoked to explain Galileo Near Infrared Mapping Spectrometer spectra of Europa's surface, thus magnesium may be present in Europa's atmosphere. We have searched for magnesium emission in the Hubble Space Telescope Faint Object Spectrograph archival spectra of Europa's atmosphere. Magnesium was not detected and we calculate an upper limit on the magnesium column abundance. This upper limit indicates that either Europa's surface is depleted in magnesium relative to sodium and potassium, or magnesium is not sputtered as efficiently resulting in a relative depletion in its atmosphere.

Hoerst, S. M. [Cooperative Institute for Research in Environmental Sciences, University of Colorado-Boulder, Boulder, CO (United States); Brown, M. E., E-mail: sarah.horst@colorado.edu [Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA (United States)

2013-02-20T23:59:59.000Z

7

Reversible Dehydrogenation of Magnesium Borohydride to Magnesium...  

NLE Websites -- All DOE Office Websites (Extended Search)

Reversible Dehydrogenation of Magnesium Borohydride to Magnesium Triborane in the Solid State Under Moderate Conditions. Reversible Dehydrogenation of Magnesium Borohydride to...

8

Potassium-magnesium antagonism in high magnesium vineyard soils.  

E-Print Network (OSTI)

??The Iowa wine and grape industry underwent a rapid phase of growth at the turn of the 21st century that is continuing to evolve and… (more)

Hannan, Joseph Michael

2011-01-01T23:59:59.000Z

9

Production of magnesium metal  

SciTech Connect

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.

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

10

Microstructural characteristics of chemically processed manganese oxide nanofibers  

SciTech Connect

Nanostructured fibrous manganese oxide cryptomelane-type hollandite powders were prepared via a chemical route. Powders were obtained by the chemical reaction of the aqueous solutions of potassium permanganate and manganese sulfate in the presence of a strong acid, followed by crystalline growth at elevated temperatures. These powders were characterized by powder X-ray diffraction (XRD), Rietveld refinement, analytical scanning electron microscopy (SEM), transmission electron microscopy (TEM) combined with micro-micro diffraction ({mu}{mu}d), and high resolution transmission electron microscopy (HRTEM). The crystalline structure, morphology, crystallite size, fiber growth direction, and structural defects are discussed.

Xiao, T.D. [CIMAV, Chihuahua (Mexico). Centro de Investigacion en Materiales Avanzados] [CIMAV, Chihuahua (Mexico). Centro de Investigacion en Materiales Avanzados; [Univ. of Connecticut, Storrs, CT (United States). Connecticut Advanced Technology Center for Precision Manufacturing; Bokhimi; Benaissa, M.; Perez, R.; Yacaman, M.J. [Univ. Nacional Autonoma de Mexico, Mexico City (Mexico). Inst. de Fisica] [Univ. Nacional Autonoma de Mexico, Mexico City (Mexico). Inst. de Fisica; Strutt, P.R. [Univ. of Connecticut, Storrs, CT (United States). Connecticut Advanced Technology Center for Precision Manufacturing] [Univ. of Connecticut, Storrs, CT (United States). Connecticut Advanced Technology Center for Precision Manufacturing

1997-04-01T23:59:59.000Z

11

Influence of Electrolyte Chemistry on Morphology and Corrosion Resistance of Micro Arc Oxidation Coatings Deposited on Magnesium  

Science Journals Connector (OSTI)

In the present work, micro arc oxidation (MAO) coatings were synthesized on magnesium...2SiO3), potassium hydroxide (KOH), and sodium aluminate (NaAlO2). The resultant coatings were subjected to coating thickness...

L. Rama Krishna; G. Poshal; G. Sundararajan

2010-12-01T23:59:59.000Z

12

Manganese carbonate additive for manganese dioxide-containing nonaqueous cells  

SciTech Connect

A nonaqueous cell employing a manganese dioxide-containing solid cathode having a minor amount of manganese carbonate to improve the pulse voltage capability of the cell at low temperatures such as -10/sup 0/ C.

Langan, R.A.

1984-10-23T23:59:59.000Z

13

Blood Serum Magnesium  

E-Print Network (OSTI)

Key Words · Blood Serum · Magnesium · Flame · Atomic Absorption Method Guide: 40162 Atomic, and magnesium is determined by flame atomic absorption spectrometry using an air-acetylene flame. Lanthanum Absorption Method Guide Mg in Blood Serum Principle The sample is diluted 1:100 with deionised water

Wells, Mathew G. - Department of Physical and Environmental Sciences, University of Toronto

14

Constraining magnesium cycling in marine sediments using magnesium isotopes  

E-Print Network (OSTI)

Constraining magnesium cycling in marine sediments using magnesium isotopes J.A. Higgins *, D Abstract Magnesium concentrations in deep-sea sediment pore-fluids typically decrease down core due to net and differentiate these processes, we have measured magnesium isotopes in pore-fluids and sediment samples from

Paytan, Adina

15

Method for production of magnesium  

DOE Patents (OSTI)

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.

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

16

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...

17

Electrodeposition of magnesium and magnesium/aluminum alloys  

DOE Patents (OSTI)

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.

Mayer, A.

1988-01-21T23:59:59.000Z

18

Electrodeposition of magnesium and magnesium/aluminum alloys  

DOE Patents (OSTI)

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.

Mayer, Anton (Los Alamos, NM)

1988-01-01T23:59:59.000Z

19

Magnesium for Future Autos  

SciTech Connect

In the quest for better fuel economy and improved environmental performance, magnesium may well become a metal of choice for constructing lighter, more efficient vehicles. Magnesium is the lightest structural metal, yet it has a high strength-to-weight ratio makes it comparable to steel in many applications. The world’s automakers already use magnesium for individual components. But new alloys and processing methods are needed before the metal can become economically and technologically feasible as a major automotive structural material. This article will explore the formation, challenges and initial results of an international collaboration—the Magnesium Front End Research and Development (MFERD) project—that is leveraging the expertise and resources of Canada, China and the United States to advance the creation of magnesium-intensive vehicles. The MFERD project aims to develop the enabling technologies and knowledge base that will lead to a vehicles that are 50-60 percent lighter, equally affordable, more recyclable and of equal or better quality when compared to today’s vehicles. Databases of information also will be captured in models to enable further alloy and manufacturing process optimization. Finally, a life-cycle analysis of the magnesium used will be conducted.

Nyberg, Eric A.; Luo, Alan A.; Sadayappan, Kumar; Shi, Wenfang

2008-10-01T23:59:59.000Z

20

Synthesis, Structure and Dehydrogenation of Magnesium Amidoborane...  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthesis, Structure and Dehydrogenation of Magnesium Amidoborane Monoammoniate. Synthesis, Structure and Dehydrogenation of Magnesium Amidoborane Monoammoniate. Abstract:...

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

It's Elemental - The Element Manganese  

NLE Websites -- All DOE Office Websites (Extended Search)

Chromium Chromium Previous Element (Chromium) The Periodic Table of Elements Next Element (Iron) Iron The Element Manganese [Click for Isotope Data] 25 Mn Manganese 54.938045 Atomic Number: 25 Atomic Weight: 54.938045 Melting Point: 1519 K (1246°C or 2275°F) Boiling Point: 2334 K (2061°C or 3742°F) Density: 7.3 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 4 Group Number: 7 Group Name: none What's in a name? From the Latin word for magnet, magnes. Say what? Manganese is pronounced as MAN-ge-nees. History and Uses: Proposed to be an element by Carl Wilhelm Scheele in 1774, manganese was discovered by Johan Gottlieb Gahn, a Swedish chemist, by heating the mineral pyrolusite (MnO2) in the presence of charcoal later that year.

22

Magnesium Research and Technology Development  

SciTech Connect

The Magnesium Research and Technical Development (MR&TD) project supports efforts to increase using magnesium in automotive applications, including improving technology, lowering costs and increasing the knowledge needed to enable alloy and manufacturing process optimization. MR&TD supports the U.S. Department of Energy (DOE)/United States Automotive Materials Partnership (USAMP) Magnesium Front End Research and Development (MFERD) project in collaboration with China and Canada. The MR&TD projects also maintains the magnesium bibliographic database at magnesium.pnl.gov.

Nyberg, Eric A.; Joost, William; Smith, Mark T.

2009-12-30T23:59:59.000Z

23

Highly Soluble Alkoxide Magnesium Salts for Rechargeable Magnesium Batteries  

SciTech Connect

A unique class of air-stable and non-pyrophoric magnesium electrolytes has been developed based on alkoxide magnesium compounds. The crystals obtained from this class of electrolytes exhibit a unique structure of tri-magnesium cluster, [Mg3Cl3(OR)2(THF)6]+ [(THF)MgCl3] . High reversible capacities and good rate capabilities were obtained in Mg-Mo6S8 batteries using these new electrolytes at both 20 and 50 oC.

Liao, Chen [ORNL] [ORNL; Guo, Bingkun [ORNL] [ORNL; Jiang, Deen [ORNL] [ORNL; Custelcean, Radu [ORNL] [ORNL; Mahurin, Shannon Mark [ORNL] [ORNL; Sun, Xiao-Guang [ORNL] [ORNL; Dai, Sheng [ORNL] [ORNL

2014-01-01T23:59:59.000Z

24

Magnesium fluoride recovery method  

DOE Patents (OSTI)

A method of obtaining magnesium fluoride substantially free from radioactive uranium from a slag containing the same and having a radioactivity level of at least about 7000 pCi/gm. The slag is ground to a particle size of about 200 microns or less. The ground slag is contacted with an acid under certain prescribed conditions to produce a liquid product and a particulate solid product. The particulate solid product is separated from the liquid and treated at least two more times with acid to produce a solid residue consisting essentially of magnesium fluoride substantially free of uranium and having a residual radioactivity level of less than about 1000 pCi/gm. In accordance with a particularly preferred embodiment of the invention a catalyst and an oxidizing agent are used during the acid treatment and preferably the acid is sulfuric acid having a strength of about 1.0 Normal.

Gay, Richard L. (Canoga Park, CA); McKenzie, Donald E. (Woodland Hills, CA)

1989-01-01T23:59:59.000Z

25

Magnesium Projects | Department of Energy  

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

Projects Magnesium Projects 2010 DOE Vehicle Technologies and Hydrogen Programs Annual Merit Review and Peer Evaluation Meeting, June 7-11, 2010 -- Washington D.C....

26

Hydrogen in magnesium palladium thin layer structures.  

E-Print Network (OSTI)

??In this thesis, the study of hydrogen storage, absorption and desorption in magnesium layers is described. The magnesium layers have a thickness of 50-500 nm… (more)

Kruijtzer, G.L.

2008-01-01T23:59:59.000Z

27

Modelling of magnesium metabolism in dairy cattle.  

E-Print Network (OSTI)

??A model of magnesium metabolism in dairy cattle has been developed by adapting and improving an earlier model of magnesium metabolism in sheep. The model… (more)

Bell, S. T.

2006-01-01T23:59:59.000Z

28

HIGH INTEGRITY MAGNESIUM AUTOMOTIVE COMPONENTS (HIMAC) | Department...  

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

HIGH INTEGRITY MAGNESIUM AUTOMOTIVE COMPONENTS (HIMAC) HIGH INTEGRITY MAGNESIUM AUTOMOTIVE COMPONENTS (HIMAC) 2009 DOE Hydrogen Program and Vehicle Technologies Program Annual...

29

Coordination Chemistry in magnesium battery electrolytes: how...  

NLE Websites -- All DOE Office Websites (Extended Search)

Chemistry in magnesium battery electrolytes: how ligands affect their performance. Coordination Chemistry in magnesium battery electrolytes: how ligands affect their performance....

30

Investigation of different manganese ores as oxygen carriers in chemical-looping combustion (CLC) for solid fuels  

Science Journals Connector (OSTI)

Abstract The chemical-looping combustion (CLC) process is a novel solution for efficient combustion with direct capture of carbon dioxide. The process uses a metal oxide as an oxygen carrier to transfer oxygen from an air to a fuel reactor, where the fuel reacts with the solid oxygen carrier. In this work, six different manganese ores are investigated as oxygen carriers for CLC application. The chemical-looping characteristics of the oxygen carriers were evaluated in a laboratory-scale fluidized-bed reactor in the temperature range of 900–970 °C during alternating reducing and oxidizing conditions. Three of the manganese ores showed a small oxygen release in inert environment between 850 and 950 °C. During reactivity tests, the gas yield with methane increased with the temperature and complete conversion of 50% CO in H2 was obtained for all of the ores. The rates of char gasification of two fuels, namely Mexican petroleum coke and Swedish wood char, were compared for the different manganese ores at 970 °C and with 50% H2O in N2 as fluidizing gas. Ilmenite and a manufactured Mn-oxide oxygen carrier consisting of Mn3O4 and MgO-stabilized ZrO2 as support were also included for comparison. The char gasification rate and the gas conversion were higher with the manganese ores and the Mn-oxide oxygen carrier compared to ilmenite. However, the higher reactivity of the manganese ores with H2 and the ensuing decrease in H2 inhibition for manganese ores is not sufficient to explain their higher rate of char gasification. Surface analysis of partially gasified petcoke particles in the presence of manganese ores showed formation of cavities and channels as well as a uniform distribution of potassium and sodium elements. The rate of char gasification also increased with the concentration of potassium and sodium impurities in the manganese ores. Thus the results suggest that the increased rate of char conversion for manganese ores is due to alkali-catalyzed steam gasification. The increase in rate of char gasification, in combination with potentially low costs of these materials suggests that manganese ores could be interesting materials for CLC with solid fuels.

Mehdi Arjmand; Henrik Leion; Tobias Mattisson; Anders Lyngfelt

2014-01-01T23:59:59.000Z

31

It's Elemental - The Element Magnesium  

NLE Websites -- All DOE Office Websites (Extended Search)

Sodium Sodium Previous Element (Sodium) The Periodic Table of Elements Next Element (Aluminum) Aluminum The Element Magnesium [Click for Isotope Data] 12 Mg Magnesium 24.3050 Atomic Number: 12 Atomic Weight: 24.3050 Melting Point: 923 K (650°C or 1202°F) Boiling Point: 1363 K (1090°C or 1994°F) Density: 1.74 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 3 Group Number: 2 Group Name: Alkaline Earth Metal What's in a name? For Magnesia, a district in the region of Thessaly, Greece. Say what? Magnesium is pronounced as mag-NEE-zhi-em. History and Uses: Although it is the eighth most abundant element in the universe and the seventh most abundant element in the earth's crust, magnesium is never found free in nature. Magnesium was first isolated by Sir Humphry Davy, an

32

Treating electrolytic manganese residue with alkaline additives for stabilizing manganese and removing ammonia  

Science Journals Connector (OSTI)

Electrolytic manganese residue (EMR) from the electrolytic manganese industry is a solid waste containing mainly calcium sulfate dihydrate and quartzite. It is impossible to directly use the EMR as a building mat...

Changbo Zhou; Jiwei Wang; Nanfang Wang

2013-11-01T23:59:59.000Z

33

Biofortifying Brassica with calcium (Ca) and magnesium (Mg)  

E-Print Network (OSTI)

zinc, copper, calcium, magnesium, selenium and iodine. NewE. 2008. Role of dietary magnesium in cardiovascular diseaseShoot calcium (Ca) and magnesium (Mg) concentrations differ

2009-01-01T23:59:59.000Z

34

New manganese catalyst for light alkane oxidation  

DOE Patents (OSTI)

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

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

35

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

Energy.gov (U.S. Department of Energy (DOE)) 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...

36

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

NLE Websites -- All DOE Office Websites (Extended Search)

Plutonium(VI) with Synthetic Manganese-Substituted Goethite. Abstract: Plutonium(VI) sorption on the surface of well-characterized synthetic manganese-substituted goethite...

37

It's Elemental - The Element Potassium  

NLE Websites -- All DOE Office Websites (Extended Search)

Argon Argon Previous Element (Argon) The Periodic Table of Elements Next Element (Calcium) Calcium The Element Potassium [Click for Isotope Data] 19 K Potassium 39.0983 Atomic Number: 19 Atomic Weight: 39.0983 Melting Point: 336.53 K (63.38°C or 146.08°F) Boiling Point: 1032 K (759°C or 1398°F) Density: 0.89 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 4 Group Number: 1 Group Name: Alkali Metal What's in a name? From the English word potash. Potassium's chemical symbol comes from the Latin word for alkali, kalium. Say what? Potassium is pronounced as poh-TASS-ee-em. History and Uses: Although potassium is the eighth most abundant element on earth and comprises about 2.1% of the earth's crust, it is a very reactive element

38

Serum magnesium level and magnesium supplementation on Type 2 Diabetes Mellitus: systematic review.  

E-Print Network (OSTI)

??Objective: To assess the association between serum magnesium levels and risk of type 2 diabetes and to evaluate the effect of magnesium supplementation on diabetes… (more)

Sefealem, Assefa Belay

2011-01-01T23:59:59.000Z

39

Drinking Water Problems: Iron and Manganese  

E-Print Network (OSTI)

Iron and manganese can give water an unpleasant taste, odor and color. In this publication you'll learn how to know whether your water contains iron or manganese and how to eliminate these contaminants with various treatment methods such as aeration...

Dozier, Monty; McFarland, Mark L.

2004-02-20T23:59:59.000Z

40

Original article Intestinal transfer of manganese  

E-Print Network (OSTI)

Original article Intestinal transfer of manganese: resemblance to and competition with calcium Y of calcium, phosphate and the sugars lactose and sorbitol on the intestinal absorption of manganese were retention of 54Mn, while phosphate decreased it. In situ ileal loop studies indicated that Mn absorption

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Magnesium outdiffusion through magnetite films grown on magnesium oxide (001) (abstract)  

E-Print Network (OSTI)

Magnesium outdiffusion through magnetite films grown on magnesium oxide (001) (abstract) K. A. Shaw of magnesium in the uppermost layers of the film, and indicate a concentration gradient, with the highest concentrations of magnesium in the surface layer. X-ray fluorescence in scanning electron microscopy

Diebold, Ulrike

42

potassium | netl.doe.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

Carbon Dioxide Capture by Absorption with Potassium Carbonate Project No.: FC26-02NT41440 Pilot Plant at the University of Texas Pilot Plant at the University of Texas The...

43

Promising Magnesium Battery Research at ALS  

NLE Websites -- All DOE Office Websites (Extended Search)

Promising Magnesium Battery Research at ALS Promising Magnesium Battery Research at ALS Print Wednesday, 23 January 2013 16:59 toyota battery a) Cross-section of the in situ...

44

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

E-Print Network (OSTI)

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

Ahmad, Sajjad

45

Cellulose-Bound Magnesium Diboride Superconductivity  

E-Print Network (OSTI)

Cellulose-Bound Magnesium Diboride Superconductivity Y.L. Lin and M.O. Pekguleryuz Department Canada Abstract--Two-phase superconductor tapes were produced by blending high purity magnesium diboride junctions. I. INTRODUCTION Magnesium diboride was found to be superconducting in 2001 by Nagamatsu et al. [1

Ryan, Dominic

46

Structural Determination of Marine Bacteriogenic Manganese Oxides  

NLE Websites -- All DOE Office Websites (Extended Search)

fig 2 Figure 2. (A) X-ray diffraction intensity data for bacteriogenic manganese oxides produced in sea water. The bottom pattern is for clean cells. (B) X-ray diffraction...

47

Climate VISION: Private Sector Initiatives: Magnesium  

Office of Scientific and Technical Information (OSTI)

Letters of Intent/Agreements Letters of Intent/Agreements International Magnesium Association Logo In response to President Bush's challenge to reduce greenhouse gas emissions, fifteen U.S. companies along with the International Magnesium Association (IMA) have voluntarily committed to eliminate SF6 emissions by 2010. This commitment builds on the efforts of the SF6 Emission Reduction Partnership for the Magnesium Industry, a partnership program that EPA has had with the industry since 1999. These industry leaders represent 100% of domestic primary magnesium production and 90% of U.S. magnesium casting capacity. In addition, the IMA's members operate on five continents and represent 80% of the global magnesium industry. The magnesium industry commonly uses a potent and long-lived greenhouse

48

Stark broadening of potassium lines  

Science Journals Connector (OSTI)

Recently published Stark broadening data of potassium ns-4p and nd-4p lines have been reexamined. Newly derived data are compared with theoretical results obtained from a simple approximative formula. The experiment agrees with theoretical results, in average, within ±20%.

N. Konjevi?

1985-07-01T23:59:59.000Z

49

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

DOE Patents (OSTI)

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.

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

2007-11-13T23:59:59.000Z

50

Method for magnesium sulfate recovery  

DOE Patents (OSTI)

A method of obtaining magnesium sulfate substantially free from radioactive uranium from a slag containing the same and having a radioactivity level of at least about 7000 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 1000 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.

Gay, Richard L. (Canoga Park, CA); Grantham, LeRoy F. (Calabasas, CA)

1987-01-01T23:59:59.000Z

51

Promising Magnesium Battery Research at ALS  

NLE Websites -- All DOE Office Websites (Extended Search)

Promising Magnesium Battery Research Promising Magnesium Battery Research at ALS Promising Magnesium Battery Research at ALS Print Wednesday, 23 January 2013 16:59 toyota battery a) Cross-section of the in situ electrochemical/XAS cell with annotations. b) Drawing and c) photograph of the assembled cell. Alternatives to the current lithium-ion-based car batteries are at the forefront of the automotive industry's research agenda-manufacturers want to build cars with longer battery life, and to do that they're going to have to find new solutions. One promising battery material is magnesium (Mg)-it is more dense than lithium, it is safer, and the magnesium ion carries a two-electron charge, giving it potential as a more efficient energy source. Magnesium has a high volumetric capacity, which could mean

52

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

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Promises and Challenges of Lithium- and Manganese-Rich Transition-Metal Layered-Oxide Cathodes Promises and Challenges of Lithium- and Manganese-Rich Transition-Metal Layered-Oxide...

53

Multivalent Manganese Hydrazide Gels for Kubas-Type Hydrogen Storage  

Science Journals Connector (OSTI)

Manganese(II) hydrazide gels designed for Kubas-type hydrogen storage were synthesized from the reaction between bis(trimethylsilylmethyl) manganese and anhydrous hydrazine. The synthetic materials were characterized by X-ray powder diffraction, nitrogen ...

Tuan K. A. Hoang; Leah Morris; Jeremy M. Rawson; Michel L. Trudeau; David M. Antonelli

2012-04-09T23:59:59.000Z

54

Magnesium Isotope Effects in Enzymatic Phosphorylation  

Science Journals Connector (OSTI)

So far as magnesium isotope effect in phosphorylation is an unexpected and unusual phenomenon, it is worthy to shortly describe materials and technologies used in isotopic biochemical experiments. ... Isotope-containing MgCl2 samples were obtained using treatment of magnesium oxides 24MgO, 25MgO, 26MgO, and *MgO with analytically pure HCl (*Mg means magnesium with natural abundance of the three isotopes; see Table 1). ...

Anatoly L. Buchachenko; Dmitry A. Kouznetsov; Natalia N. Breslavskaya; Marina A. Orlova

2008-02-05T23:59:59.000Z

55

Laser Brazing of Magnesium to Steel Sheet.  

E-Print Network (OSTI)

??The ability to effectively join magnesium alloys to steel will facilitate increased application and use of Mg alloys in the automotive and aerospace industries where… (more)

Nasiri, Ali Mohamad

2013-01-01T23:59:59.000Z

56

Precipitation of petroleum sulfonates by magnesium ions  

SciTech Connect

The precipitation of petroleum sulfonates was accomplished by the addition of magnesium ions. The magnesium tolerance, defined as the total magnesium concentration at which 5% of the total sulfonate was precipitated, was determined in aqueous solution for 20 commercial petroleum sulfonates. The magnesium tolerances ranged from essentially zero up to 2300 ppM of magnesium. The level of magnesium tolerated increases as the average equivalent weight of the sulfonate decreases. The precipitate formed during the reaction includes a high percentage of sodium sulfonate as well as magnesium sulfonate. All of the samples were prepared to contain 3% active sulfonate, and the reaction temperature was 30/sup 0/C. The precipitate was removed by centrifuging and filtering. The amount of unreacted sulfonate remaining in the filtrate was determined indirectly by measuring the magnesium and sodium remaining in the filtrate. The viscosities of the filtrates were found to change as the amount of magnesium added was increased. The viscosity goes through at least one maximum before rapid precipitation of sulfonate occurs. 5 figures, 2 tables.

French, T.R.; Collins, A.G.

1980-05-01T23:59:59.000Z

57

Structural Cast Magnesium Development (SCMD) AMD 111  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

* Redesign an existing aluminum engine cradle to magnesium for the 2006 Corvette ZO6 vehicle at no cost penalty and no changes to vehicle build cradle installation sequence. *...

58

Climate VISION: Private Sector Initiatives: Magnesium: Results  

Office of Scientific and Technical Information (OSTI)

website and on the SF6 Emission Reduction Partnership for the Magnesium Industry website. Please check back on this website and the Energy Information Agency website for updates...

59

Magnesium Research in the Automotive Lightweighting Materials...  

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

in the Automotive Lightweighting Materials Program Magnesium Research in the Automotive Lightweighting Materials Program Presentation from the U.S. DOE Office of Vehicle...

60

MAGNESIUM-TITANIUM ALLOYS FOR BIOMEDICAL APPLICATIONS.  

E-Print Network (OSTI)

??Magnesium has been identified as a promising biodegradable implant material because it does not cause systemic toxicity and can reduce stress shielding. However, it corrodes… (more)

Hoffmann, Ilona

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Diffusion of sodium, potassium, calcium, manganese, and radon in tuff and clinoptilolite under leaching  

Science Journals Connector (OSTI)

Nuclear physics methods are used to determine the diffusion coefficients of Na, Ca, Mn, K, and 222Rn in clinoptilolite (Sokirnitsa occurrence, Ukraine) and in natural tuff (Yucca Mountain, Nevada, United States) ...

N. P. Dikii; A. N. Dovbnya; Yu. V. Lyashko; D. V. Medvedev…

2011-07-01T23:59:59.000Z

62

THE STATE OF MANGANESE IN THE PHOTOSYNTHETIC APPARATUS. II. X-RAY ABSORPTION EDGE STUDIES ON MANGANESE IN PHOTOSYNTHETIC MEMBRANES  

E-Print Network (OSTI)

oxygen evolving capabilities ed X) These preparations are reported to have 4-6 manganese atoms per photochemical reaction center(

Kirby, J.A.

2013-01-01T23:59:59.000Z

63

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

NLE Websites -- All DOE Office Websites (Extended Search)

Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. Abstract: As a...

64

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

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

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

65

Degradation mechanism and surface modification of biomedical magnesium alloy.  

E-Print Network (OSTI)

???The degradability of magnesium and magnesium alloys in a physiological environment makes them desirable biodegradable biomaterials in many applications. However, their fast degradation rates in… (more)

Xin, Yunchang (???)

2010-01-01T23:59:59.000Z

66

Local environment and composition of magnesium gallium layered...  

NLE Websites -- All DOE Office Websites (Extended Search)

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

67

Scale-Up of Magnesium Production by Fully Stabilized Zirconia...  

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

Scale-Up of Magnesium Production by Fully Stabilized Zirconia Electrolysis Scale-Up of Magnesium Production by Fully Stabilized Zirconia Electrolysis 2012 DOE Hydrogen and Fuel...

68

Magnesium Front End Development (AMD 603/604/904) | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Magnesium Front End Development (AMD 603604904) Magnesium Front End Development (AMD 603604904) 2011 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program...

69

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

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

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

70

Alloys as Anode Materials in Magnesium Ion Batteries.  

E-Print Network (OSTI)

?? This thesis is a feasibility study of the possible application of magnesium alloys forfuture magnesium-ion batteries. It investigates dierent alloys and characterizesthem with respect… (more)

Syvertsen, Alf Petter

2012-01-01T23:59:59.000Z

71

Climate VISION: Private Sector Initiatives: Magnesium: Work Plans  

Office of Scientific and Technical Information (OSTI)

Work Plans EPA's SF6 Emission Reduction Partnership for the Magnesium Industry in cooperation with the International Magnesium Association has developed a work plan for achieving...

72

Magnesium energy cycle system for the power product  

Science Journals Connector (OSTI)

The energy storage of solar radiation with magnesium as an energy reservoir is proposed for renewable energy cycle. Magnesium reaction with water generating hydrogen and residual...

Sakurai, Yasutaka; Yabe, Takashi; Ikuta, Kazunari; Ishioka, Manabu; Ogata, Yoichi; Sato, Yuji

2007-01-01T23:59:59.000Z

73

The TMS Magnesium Committee: Committed to the Advancement of Global Magnesium Technology  

SciTech Connect

The TMS Magnesium Committee was established in the year 2000 as a spin-off of the Reactive Metals Committee, triggered by the strong global growth of magnesium being used in a variety of structural lightweight applications since the mid-1990’s. Since then the committee has seen a distinct development in terms of size, participation and focus. The article at hand outlines this development by recapitulating the output of its two main activities: the annual Magnesium Technology Symposia and the JOM Special Issues dedicated to magnesium research and development. Further records on the Magnesium Committee are available from the committee homepage (accessible through http://members.tms.org).

Sillekens, Wim H.; Nyberg, Eric A.

2011-04-21T23:59:59.000Z

74

Metallic bonding in magnesium microclusters  

Science Journals Connector (OSTI)

We investigate the size evolution of bonding in magnesium clusters Mgn, with n?20. Computations are performed in the density-functional scheme with two prescriptions for the exchange-correlation energy: the local-density approximation (LDA), and an improved scheme including gradient corrections (GC). The LDA results show that Mg10 clusters already have acquired several of the characteristic features of metallic aggregates. GC significantly decrease the cohesive energies, and predict a slower convergence with n to the bulk, without changing, however, the qualitative picture given by LDA.

P. Delaly; P. Ballone; J. Buttet

1992-02-15T23:59:59.000Z

75

METHODS FOR THE MICROFABRICATION OF MAGNESIUM Melissa Tsang1  

E-Print Network (OSTI)

was investigated. Boutry et al. fabricated magnesium-based RLC resonators using electric discharge machining (EDM

76

REVIEW ARTICLE A review on magnesium alloys as biodegradable materials  

E-Print Network (OSTI)

REVIEW ARTICLE A review on magnesium alloys as biodegradable materials Xue-Nan GU, Yu-Feng ZHENG 100871, China © Higher Education Press and Springer-Verlag Berlin Heidelberg 2010 Abstract Magnesium of biomedical magnesium alloys is based on the industrial magnesium alloys system, and another is the self

Zheng, Yufeng

77

Viscosity of Liquid Sodium and Potassium  

Science Journals Connector (OSTI)

2 November 1936 research-article Viscosity of Liquid Sodium and Potassium Y. S. Chiong The Royal Society is collaborating with JSTOR to digitize, preserve, and extend...

1936-01-01T23:59:59.000Z

78

First-principles characterization of potassium intercalation...  

NLE Websites -- All DOE Office Websites (Extended Search)

intercalation in the hexagonal 2H-MoS2. Abstract: Periodic density functional theory calculations were performed to study the structural and electronic properties of potassium...

79

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

E-Print Network (OSTI)

to the deceleration of lipid movement (137). The cholesterol content of the plasma membrane is also believed to affect the permeability and fluidity of the membrane by affecting the degree of "tightness" of the lipid components. Kroes and Ostwald demonstrated a...

Wehrman, Noreen Elaine

1993-01-01T23:59:59.000Z

80

Magnesium-Isotope Fractionation During Plant Growth  

Science Journals Connector (OSTI)

With three stable isotopes naturally abundant (24Mg, 78.992%; 25Mg, 10.003%; 26Mg, 11.005%), magnesium stable isotope fractionation may provide insights into these cycles. ... Measurements of the magnesium isotopic composition of chlorophylls, seeds, shoots, roots, leaves, exudates, and the limiting nutrient solution over time show that the plant appears to establish an isotopic equilibrium with the nutrient available to it and that the plant (in particular, the seeds and exudates) becomes enriched in the heavy isotopes of magnesium in a mass-dependent relationship as the plant reaches maturity. ...

Jay R. Black; Emanuel Epstein; William D. Rains; Qing-zhu Yin; William H. Casey

2008-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Evaluating the In Vitro Corrosion Behavior and Cytotoxicity of Vapor Deposited Magnesium Alloys.  

E-Print Network (OSTI)

??Magnesium alloys are emerging as a promising class of bioabsorbable implant materials due to magnesium’s biocompatibility and propensity for corrosion. These alloys are useful for… (more)

Petrilli, John

2009-01-01T23:59:59.000Z

82

Controlling the Biodegradation of Magnesium Implants Through Nanostructured Calcium-Phosphate Coating  

E-Print Network (OSTI)

phosphate coating on magnesium alloy for modification ofof calcium-containing magnesium alloys in modified-simulatedMazaki N. Surface reaction of magnesium in Hank’s solutions.

Iskandar, Maria Emil

2012-01-01T23:59:59.000Z

83

The Effect of Processing Parameters on the Thermoelectric Properties of Magnesium Silicide  

E-Print Network (OSTI)

bulk nanostructured magnesium silicide (Mg2Si) compounds,”physical metallurgy of magnesium and its alloys. Pergamonthe Thermoelectric Properties of Magnesium Silicide A Thesis

Fong, Anthony

2012-01-01T23:59:59.000Z

84

An experimental study of magnesium-isotope fractionation in chlorophyll-a photosynthesis  

E-Print Network (OSTI)

phosphorylation is a magnesium nuclear spin controlledMagnetic isotope effect of magnesium in phosphoglycerateexchange activities in magnesium chelatase subunits of

Black, J R; Yin, Q Z; Casey, W H

2006-01-01T23:59:59.000Z

85

Synthesis and Evaluation of Poly(3,4-ethylenedioxythiophene) (PEDOT) Coated Magnesium for Nerve Regeneration  

E-Print Network (OSTI)

biodegradation of biocompatable magnesium alloys. Corrosion7th International Conference on Magnesium Alloys and theirapplications. 2007. 1126. Magnesium. obtained from http://

Sebaa, Meriam Amel

2012-01-01T23:59:59.000Z

86

Climate VISION: Private Sector Initiatives: Magnesium  

Office of Scientific and Technical Information (OSTI)

Federal/State Programs Federal/State Programs U.S. EPA's SF6 Emission Reduction Partnership for the Magnesium Industry Leading magnesium producers and casting companies are working with the U.S. Environmental Protection Agency (EPA) to alleviate the global environmental threat of climate change. EPA is very proud to cooperate with the industry through the SF6 Emission Reduction Partnership for the Magnesium Industry and the International Magnesium Association (IMA) to protect the climate. This voluntary initiative is guiding research of new technologies, promoting environmental stewardship, and providing a valuable forum to freely exchange technical information. Significant progress has been made to identify and implement SF6 emission reduction strategies since the partnership's inception.

87

Corrosion Analysis of Biodegradable Magnesium Implants.  

E-Print Network (OSTI)

??The purpose of this research is to investigate the micro-galvanic corrosion behavior of the pure magnesium in aqueous solutions, especially in DI water and NaCl… (more)

Lee, Namheon

2009-01-01T23:59:59.000Z

88

Laser Ignition of Single Magnesium Particles  

Science Journals Connector (OSTI)

The minimum ignition temperature and minimum ignition energy of single magnesium particles was determined ... levitated ultrasonically and was ignited by a short laser pulse. The temperature transient of the part...

J. F. Zevenbergen; A. E. Dahoe…

2000-01-01T23:59:59.000Z

89

Magnesium Front End Design and Development  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

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...

90

$?$ hyperonic effect on the magnesium dripline  

E-Print Network (OSTI)

Neutron dripline calculations for both magnesium nuclei and magnesium + $\\Lambda$ hypernuclei have been carried out in a microscopic framework using a chiral effective model. The results are compared with two other relativistic mean field models, SPL-40 and NL3. All three models describe the $\\Lambda$ separation energy of known hypernuclei adequately. The extrapolation to the driplines for moderately heavy hypernuclei are found to be strongly model-dependent.

Torsten Schürhoff; Stefan Schramm; Chhanda Samanta

2014-05-28T23:59:59.000Z

91

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

SciTech Connect

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.

None

2012-01-01T23:59:59.000Z

92

Magnesium phosphate glass cements with ceramic-type properties  

DOE Patents (OSTI)

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.

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

1984-03-13T23:59:59.000Z

93

Magnesium-phosphate-glass cements with ceramic-type properties  

DOE Patents (OSTI)

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.

Sugama, T.; Kukacka, L.E.

1982-09-23T23:59:59.000Z

94

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

E-Print Network (OSTI)

of nanograined free-standing magnesium–nickel ?lms MatthewAbstract Free-standing magnesium–nickel (Mg–Ni) ?lms withfree- standing magnesium–nickel ?lms. Magnesium hydride (MgH

2009-01-01T23:59:59.000Z

95

The magnesium nutrition of American upland and Egyptian cottons  

E-Print Network (OSTI)

. Magnesium n1trate, sulfate, and chloxide ax'e highly soluble in water and are read1ly leached from the soil ~ Albert and Armstrong (l) grew cotton plants in nutrient solutions containing two levels of magnesium and found that greater top and root gx... on maturity of cotton X the rate of growth was not afflicted by magnesium supply but symptoms of magnesium deficien)y were present in the foliage of the low magnesium plants ~ Schappelle, Armstrong and Hollis (52) studied the effect of high magnesium...

Helmy, Hussein

1956-01-01T23:59:59.000Z

96

Fabrication and properties of syntactic magnesium foams  

SciTech Connect

Syntactic magnesium foams which consist of thin-walled hollow alumina spheres embedded in a magnesium matrix were fabricated by infiltrating a three-dimensional array of hollow spheres with a magnesium melt by using a gas pressure-assisted casting technique. The resulting composite contains closed cells of homogeneous and isotropic morphology. The densities of the syntactic magnesium foams were between 1.0 and 1.4 g/cm{sup 3}. The densities were controlled by variations in the bulk density of the hollow spheres with the volume fraction of spheres kept constant at approximately 63%. Compressive deformation characteristics of the composites were evaluated with respect to the influence of matrix strength and sphere wall thickness on characteristic variables such as compressive strength, plateau stress and energy absorption efficiency. Differences in the strength of the magnesium-based matrix materials investigated (cp-Mg, AM20, AM50, AZ91) had little influence on the compressive strength of the syntactic foam. However, an increasing relative wall thickness of the hollow ceramic spheres led to a significant strength enhancement. In all cases the ratio between compressive and plateau strength rose with increasing composite strength resulting in decreasing energy absorption efficiency.

Hartmann, M.; Reindel, K.; Singer, R.F. [Univ. of Erlangen (Germany). Dept. of Material Science

1998-12-31T23:59:59.000Z

97

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...

98

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

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

AMD 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...

99

Magnesium content of calcite in carapaces of benthic armine Ostracoda  

E-Print Network (OSTI)

difference in magnesium content among superfamily groups is not known but may be due to the fact that the cytheraceans are more highly evolved than the other groups studied. Variation of water temperature was judged to be a significant source of variation... control of the magnesium content of calcite. He believed that phyla considered more advanced might be better able to discriminate against magnesium during precipitation of calcite. Blatt, Middleton, and Murray (1972) suggested that magnesium causes a...

Cadot, H. M.; Kaesler, R. L.

1977-07-22T23:59:59.000Z

100

REGULAR ARTICLE Why calcium inhibits magnesium-dependent enzyme  

E-Print Network (OSTI)

REGULAR ARTICLE Why calcium inhibits magnesium-dependent enzyme phosphoserine phosphatase. Keywords Phosphoserine phosphatase Á Magnesium Á Calcium Á Density functional calculations Á Inhibition mechanism 1 Introduction Phosphoserine phosphatase (PSP, EC 3.1.3.3) is a mono- nuclear magnesium

Liao, Rongzhen

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

The Microstructure of Mechanically Alloyed Nanocrystalline Aluminium-Magnesium  

E-Print Network (OSTI)

The Microstructure of Mechanically Alloyed Nanocrystalline Aluminium-Magnesium Jen Gubicza1 analysis. Magnesium gradually goes into solid solution during ball milling and after 3 h almost all. Experimental A series of aluminium-magnesium samples were prepared from high purity aluminium (99.9%) powder

Gubicza, Jenõ

102

The influence of magnesium deficiency on inflammatory reaction in rats  

E-Print Network (OSTI)

The influence of magnesium deficiency on inflammatory reaction in rats Régine DELAIGUE, P. DUCHENE, France. Summary. The inflammatory reactions obtained in magnesium-deficient rats, by injecting of inflammatory reactions observed in magnesium- deficient rats could not be explained only by histamine

Paris-Sud XI, Université de

103

NUCLEATION PHENOMENON IN SiC PARTICULATE REINFORCED MAGNESIUM COMPOSITE  

E-Print Network (OSTI)

NUCLEATION PHENOMENON IN SiC PARTICULATE REINFORCED MAGNESIUM COMPOSITE Y. Cai, D. Taplin, M.J. Tan performance of matrix metals and alloys. Most magnesium alloy based MMCs are produced via a casting process into the last freezing interdendritic regions. For magnesium based composites, both particle pushing (or capture

Zhou, Wei

104

The Bolting of Magnesium Components in Car Engines  

E-Print Network (OSTI)

1 The Bolting of Magnesium Components in Car Engines Sarennah J.P. Longworth Newnham College vehicles. At present this is achieved through the use of ultralight steels, aluminium alloys and magnesium alloys for some body parts. Magnesium has the highest strength-to-weight ratio of any structural metal

Cambridge, University of

105

BAND STRUCTURE AND OPTICAL PROPERTIES OF MAGNESIUM FLUORIDE  

E-Print Network (OSTI)

595 BAND STRUCTURE AND OPTICAL PROPERTIES OF MAGNESIUM FLUORIDE C. JOUANIN, J. P. ALBERT and C'autres transitions expéri- mentales. Abstract. 2014 The electronic band structure of magnesium fluoride is calculated, only some qualitative investigations exist for the calcium and magnesium fluorides [1, 2]. This lack

Paris-Sud XI, Université de

106

Distribution of Grain Boundary Planes and Misorientations in Magnesium Oxide  

E-Print Network (OSTI)

Distribution of Grain Boundary Planes and Misorientations in Magnesium Oxide D.M. Saylor 1 , A distribution, magnesium oxide. Abstract. We have developed a technique that allows the geometry of polycrystalline magnesium oxide. Using these data, we have specified the distribution of grain boundaries within

Rohrer, Gregory S.

107

SOLID STATE JOINING OF MAGNESIUM TO STEEL  

SciTech Connect

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.

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

2012-06-04T23:59:59.000Z

108

Solvation of Magnesium Dication: Molecular Dynamics Simulation and Vibrational Spectroscopic Study of Magnesium Chloride in Aqueous Solutions  

E-Print Network (OSTI)

Solvation of Magnesium Dication: Molecular Dynamics Simulation and Vibrational Spectroscopic Study of Magnesium Chloride in Aqueous Solutions Karen M. Callahan, Nadia N. Casillas-Ituarte, Martina Roeselova 26, 2010 Magnesium dication plays many significant roles in biochemistry. While it is available

109

Direct Hydrogenation Magnesium Boride to Magnesium Borohydride: Demonstration of >11 Weight Percent Reversible Hydrogen Storage  

SciTech Connect

We here for the first time demonstrate direct hydrogenation of magnesium boride, MgB2, to magnesium borohydride, Mg(BH4)2 at 900 bar H2-pressures and 400°C. Upon 14.8wt% hydrogen release, the end-decomposition product of Mg(BH4)2 is MgB2, thus, this is a unique reversible path here obtaining >11wt% H2 which implies promise for a fully reversible hydrogen storage material.

Severa, Godwin; Ronnebro, Ewa; Jensen, Craig M.

2010-11-16T23:59:59.000Z

110

Assessment of the magnesium primary production technology. Final report  

SciTech Connect

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.

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

1981-02-01T23:59:59.000Z

111

Development of Integrated Die Casting Process for Large Thin-Wall Magnesium Applications Enabling Production of Lightweight Magnesium Parts for Near-Term Automotive Applications, April 2013  

Energy.gov (U.S. Department of Energy (DOE))

Development of Integrated Die Casting Process for Large Thin-Wall Magnesium Applications Enabling Production of Lightweight Magnesium Parts for Near-Term Automotive Applications

112

Why sequence freshwater manganese depositing β-proteobacterium  

NLE Websites -- All DOE Office Websites (Extended Search)

freshwater manganese depositing β-proteobacterium freshwater manganese depositing β-proteobacterium (Siderocapsaceae)? Stream biofilms are key component of stream food webs and contain bacteria that contribute to the carbon and nitrogen cycles. A slow-growing bacterium isolated from a freshwater stream biofilm has potential bioenergy and bioremediation applications. JOSHI_001 is part of a class of bacteria that deposit iron and manganese precipitates externally to the colony early in its life cycle and could be used for fuel cells and to help clean up manganese contaminated water. Members of the Siderocapsaceae family to which JOSHI_001 belongs have been observed in biofilms for the past century, but have never before been isolated and cultivated in a laboratory environment. As a result, researchers have not been able to learn about the

113

Neutron Activation Analysis of Manganese and Sodium in Bacterial Cells  

Science Journals Connector (OSTI)

...research-article Metabolism and Products Neutron Activation Analysis of Manganese and Sodium...Columbus, Ohio 43210. The application of neutron activation analysis for mineral determinations...two elements. The results indicate that neutron activation analysis is readily applicable...

Woodrow B. Krueger; Walter E. Carey; Bruno J. Kolodzeij

1970-12-01T23:59:59.000Z

114

Studies of potassium-promoted nickel catalysts for methane steam reforming: Effect of surface potassium location  

Science Journals Connector (OSTI)

Abstract The effect of potassium addition to the Ni/Al2O3 steam reforming catalyst has been investigated on several model systems, including K/Al2O3 with various amounts of alkali promoters (1–4 wt% of K2O), a model catalyst 90%NiO-10%Al2O3 promoted with potassium and a commercial catalyst. The potassium surface state and stability were investigated by means of the Species Resolved Thermal Alkali Desorption method (SR-TAD). The activity of the catalysts in the steam reforming of methane and their coking-resistance were also evaluated. The results reveal that the beneficial effect of potassium addition is strongly related to its location in the catalysts. The catalyst surface should be promoted with potassium in order to obtain high coking-resistant catalysts. Moreover, the catalyst preparation procedure should ensure a direct interaction of potassium with the Al2O3 support surface. Due to the low stability of potassium on ?-Al2O3 this phase is undesirable during the preparation of a stable steam reforming catalyst.

Tadeusz Borowiecki; Andrzej Denis; Micha? Rawski; Andrzej Go??biowski; Kazimierz Sto?ecki; Jaromir Dmytrzyk; Andrzej Kotarba

2014-01-01T23:59:59.000Z

115

Laser-induced magnesium production from magnesium oxide using reducing agents  

SciTech Connect

Experiments for laser induced production of magnesium (Mg) from magnesium oxide (MgO) using reducing agents (R) were conducted. In these experiments, continuous wave CO{sub 2} focused laser is focused on a mixture of magnesium oxide and reducing agent. High power density of focused laser leads to high temperature and the reduction reaction resulting in Mg production. The resultant vapor is collected on a copper plate and analyzed in terms of magnesium deposition efficiency. Deposition efficiencies with various reducing agents such as Zr, C, and Si have been measured to be 60, 9.2, and 12.1 mg/kJ respectively. An excess addition of reducing agent over their corresponding reaction stoichiometric amounts is found to be optimum condition for the most of performed laser induced reactions. In addition, utilizing solar-pumped laser in Mg production with reducing agent will reduce CO{sub 2} emission and produce magnesium with high-energy efficiency and large throughput.

Mohamed, M. S.; Yabe, T.; Baasandash, C.; Sato, Y.; Mori, Y.; Shi-Hua, Liao; Sato, H.; Uchida, S. [Entropia Laser Initiative, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8552 (Japan)

2008-12-01T23:59:59.000Z

116

Lead magnesium niobate actuator for micropositioning  

DOE Patents (OSTI)

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.

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

1994-01-01T23:59:59.000Z

117

Lead magnesium niobate actuator for micropositioning  

DOE Patents (OSTI)

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.

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

1994-10-25T23:59:59.000Z

118

Proton conductivity of potassium doped barium zirconates  

SciTech Connect

Potassium doped barium zirconates have been synthesized by solid state reactions. It was found that the solubility limit of potassium on A-sites is between 5% and 10%. Introducing extra potassium leads to the formation of second phase or YSZ impurities. The water uptake of barium zirconates was increased even with 5% doping of potassium at the A-site. The sintering conditions and conductivity can be improved significantly by adding 1 wt% ZnO during material synthesis. The maximum solubility for yttrium at B-sites is around 15 at% after introducing 1 wt% zinc. The conductivity of Ba{sub 0.95}K{sub 0.05}Zr{sub 0.85}Y{sub 0.11}Zn{sub 0.04}O{sub 3-{delta}} at 600 deg. C is 2.2x10{sup -3} S/cm in wet 5% H{sub 2}. The activation energies for bulk and grain boundary are 0.29(2), 0.79(2) eV in wet 5% H{sub 2} and 0.31(1), 0.74(3) eV in dry 5% H{sub 2}. A power density of 7.7 mW/cm{sup 2} at 718 deg. C was observed when a 1 mm thick Ba{sub 0.95}K{sub 0.05}Zr{sub 0.85}Y{sub 0.11}Zn{sub 0.04}O{sub 3-{delta}} pellet was used as electrolyte and platinum electrodes. - Graphical abstract: Potassium doped barium zirconates have been synthesized by solid state reactions. It was found that the solubility limit of potassium on A-sites is between 5% and 10 %. The sintering conditions and conductivity can be improved significantly by adding 1 wt% ZnO during material synthesis. Five percent doping of potassium at A-site can double the total conductivity.

Xu Xiaoxiang [School of Chemistry, University of St. Andrews, Fife KY16 9ST (United Kingdom); Tao Shanwen, E-mail: s.tao@hw.ac.u [School of Chemistry, University of St. Andrews, Fife KY16 9ST (United Kingdom); Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); Irvine, John T.S. [School of Chemistry, University of St. Andrews, Fife KY16 9ST (United Kingdom)

2010-01-15T23:59:59.000Z

119

The Oxygen core inside the Magnesium isotopes  

E-Print Network (OSTI)

We have studied the ground state bulk properties of magnesium isotopes using axially symmetric relativistic mean field formalism. The BCS pairing approach is employed to take care of the pairing correlation for the open shell nuclei. The contour plot of the nucleons distribution are analyzed at various parts of the nucleus, where clusters are located. The presence of an $^{16}$O core along bubble like $\\alpha$-particle(s) and few {\\it nucleons} are found in the Mg isotopes.

Bhuyan, M

2013-01-01T23:59:59.000Z

120

Impurity control and corrosion resistance of magnesium-aluminum alloy  

SciTech Connect

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.

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

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Reversible Dehydrogenation of Magnesium Borohydride to Magnesium Triborane in the Solid State Under Moderate Conditions  

SciTech Connect

Thermal decomposition of magnesium borohydride, Mg(BH4)2, in the solid state was studied by a combination of PCT, TGA/MS and NMR spectroscopy. Dehydrogenation of Mg(BH4)2 at 200 °C, results in the highly selective formation of magnesium triborane, Mg(B3H8)2. This process is reversible at 250 °C under 120 atm H2. Dehydrogenation at higher temperature, > 300 °C, produces a complex mixture of polyborane species. Solution phase 11B NMR spectra of the hydrolyzed decomposition products reveals the formation of the B3H8 anion, boric acid from hydrolysis of the unstable polyboranes (BnHx) (n = 3-11, x >8), and the closoborane B12H12 dianion as a minor product. A BH condensation mechanism involving metal hydride formation is proposed to explain the limited reversible hydrogen storage in magnesium borohydride.

Chong, Marina; Karkamkar, Abhijeet J.; Autrey, Thomas; Orimo, Shin-ichi; Jalisatgi, Satish; Jensen, Craig M.

2011-02-17T23:59:59.000Z

122

E-Print Network 3.0 - anhydrous magnesium chloride Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

magnesium ion concentration dependence of strand exchange... M Tris-acetate or Tris-HCI (pH 7.5), IO mM magnesium acetate or magnesium chloride, 3.7% glycerol, 1 m... and...

123

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

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

More Documents & Publications Development of High-Volume Warm Forming of Low-Cost Magnesium Sheet Development of High-Volume Warm Forming of Low-Cost Magnesium Sheet Magnesium...

124

Rapidly solidified magnesium: nickel alloys as hydrogen storage materials.  

E-Print Network (OSTI)

??Due to high hydrogen capacity, good reversibility and low cost, magnesium hydride is one of the most promising hydrogen storage materials. However, the high desorption… (more)

Yi, Xiaodong

2014-01-01T23:59:59.000Z

125

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...

126

Failure of extruded magnesium alloy tubes during hydroforming.  

E-Print Network (OSTI)

??Research is currently being conducted on the feasibility of hydroforming extruded magnesium tubes to integrate multiple parts into a single hydroformed section. Among other advantages,… (more)

Hiscocks, Jessica.

2006-01-01T23:59:59.000Z

127

Magnesium Front End Design and Development | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Design and Development Magnesium Front End Design and Development 2009 DOE Hydrogen Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting, May...

128

Magnesium Front End Development (AMD 603/604/904) | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Development (AMD 603604904) Magnesium Front End Development (AMD 603604904) 2012 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and...

129

Xenon in Mercury-Manganese Stars  

E-Print Network (OSTI)

Previous studies of elemental abundances in Mercury-Manganese (HgMn) stars have occasionally reported the presence of lines of the ionized rare noble gas Xe II, especially in a few of the hottest stars with Teff ~ 13000--15000 K. A new study of this element has been undertaken using observations from Lick Observatory's Hamilton Echelle Spectrograph. In this work, the spectrum synthesis program UCLSYN has been used to undertake abundance analysis assuming LTE. We find that in the Smith & Dworetsky sample of HgMn stars, Xe is vastly over-abundant in 21 of 22 HgMn stars studied, by factors of 3.1--4.8 dex. There does not appear to be a significant correlation of Xe abundance with Teff. A comparison sample of normal late B stars shows no sign of Xe II lines that could be detected, consistent with the expected weakness of lines at normal abundance. The main reason for the previous lack of widespread detection in HgMn stars is probably due to the strongest lines being at longer wavelengths than the photographic blue. The lines used in this work were 4603.03A, 4844.33A and 5292.22A.

M. M. Dworetsky; J. L. Persaud; K. Patel

2008-01-16T23:59:59.000Z

130

Substantiation of proposals on standardization of the manganese content in water supplied for electrodyalysis treatment  

Science Journals Connector (OSTI)

The results of systematic investigations of the electrodialysis process of manganese-containing solutions and the impact of manganese compounds on electrochemical characteristics of ion-exchange membranes have...

L. A. Mel’nik

2011-02-01T23:59:59.000Z

131

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

NLE Websites -- All DOE Office Websites (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...

132

E-Print Network 3.0 - annealed magnesium silicate Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

341, 2005 Summary: to predict the infrared spectrum of an amorphous magnesium silicate condensate after thermal annealing over... to anneal on the same timescale as magnesium...

133

Magnesium isotopic fractionation in chondrules from the Murchison and Murray CM2 carbonaceous chondrites  

E-Print Network (OSTI)

Magnesium isotopic fractionation in chondrules from the Murchison and Murray CM2 carbonaceous. Investigation of the magnesium isotopic compositions of chondrules can place stringent constraints on the timing

Grossman, Lawrence

134

AN X-RAY ABSORPTION SPECTROSCOPY STUDY OF MANGANESE CONTAINING COMPOUNDS AND PHOTOSYNTHETIC SPINACH CHLOROPLASTS  

E-Print Network (OSTI)

oxygen evolving capabilities. These preparations are reported to have 4-6 manganese atoms per photochemical reaction center(

Kirby, Jon Allan

2012-01-01T23:59:59.000Z

135

Joining of highly aluminum-doped lanthanum strontium manganese oxide with tetragonal zirconia by plastic deformation  

E-Print Network (OSTI)

Joining of highly aluminum-doped lanthanum strontium manganese oxide with tetragonal zirconia February 2008; accepted 24 March 2008 Abstract Aluminum-doped lanthanum strontium manganese oxide, La0.77Sr at the interface. © 2008 Elsevier B.V. All rights reserved. Keywords: Lanthanum strontium aluminum manganese oxide

Dutta, Prabir K.

136

Manganese-Containing Cathode-Active Materials for Lithium-Ion Batteries  

Science Journals Connector (OSTI)

Manganese, which has a Clarke number of 0.06%,1...is the tenth-most abundant element in the earth’s crust, and has been utilized as a cathode-active material for manganese, alkaline-manganese, and lithium ... , f...

Koichi Numata

2009-01-01T23:59:59.000Z

137

Nano-sized manganese oxides as biomimetic catalysts for water oxidation in artificial photosynthesis: a review  

Science Journals Connector (OSTI)

...review-article Review articles 1004 30 36 15 Nano-sized manganese oxides as biomimetic...of about approximately 0.5 nm. Thus, nano-sized manganese compounds might be good...particles. In this paper, we focus on nano-sized manganese oxides as functional...

2012-01-01T23:59:59.000Z

138

Cell cycle-regulated manganese superoxide dismutase activity via reversible  

NLE Websites -- All DOE Office Websites (Extended Search)

cycle-regulated manganese superoxide dismutase activity via reversible cycle-regulated manganese superoxide dismutase activity via reversible phosphorylation Demet Candas University of California Davis Abstract The constant stress environment that the cells live in required the development of defense systems against free radical and radiation insults. One of the major antioxidant enzymes responsible for detoxifying free radical species is manganese superoxide dismutase (MnSOD, Sod2), which is specifically localized into the mitochondria of cells. MnSOD catalyzes the conversion of two molecules of superoxide anion into water and hydrogen peroxide, the latter of which is then further oxidized to water. The significance of the role of MnSOD activity was shown by the studies showing that the loss or deficiency of MnSOD sensitize cells to ionizing

139

Nano-engineering of magnesium hydride for hydrogen storage  

Science Journals Connector (OSTI)

The destabilization of magnesium hydride (MgH"2) by solid-state reaction with Si in a nanoscale under vacuum was studied. The nanostructured Si films were deposited on the nanocrystalline MgH"2/Mg composite substrate by the pulsed laser deposition (PLD). ... Keywords: Destabilization, Magnesium hydride, Microstructure, Nano-engineering, Silicon

J. Bystrzycki; T. P?oci?ski; W. Zieli?ski; Z. Winiewski; M. Polanski; W. Mróz; Z. Bojar; K. J. Kurzd?owski

2009-04-01T23:59:59.000Z

140

Product development of FGD recovered magnesium hydroxide  

SciTech Connect

The ThioClear FGD processes developed by the Dravo Lime Company (DLC) produce a high brightness gypsum and magnesium hydroxide (Mg(OH){sub 2}) by-product. Both originate as white precipitates from a solution of magnesium sulfate. The use of magnesium-enhanced lime avoids the mineral impurities from direct neutralization when using pulverized limestone rock. White, pure FGD synthetic gypsum can be used to produce higher value products such as mineral fillers and industrial plasters. This paper focuses on the product development of the Mg(OH){sub 2} by-product. Commercial Mg(OH){sub 2} sells at over $200/Ton for a variety of uses, most of which is wastewater treatment and a feedstock to make magnesium chemicals and refractories. Beneficial uses in the power plant are pH control of acidic coal pile stormwater runoff and bottom ash quench water. A future use being explored is injection into coal fired boilers to neutralize sulfur trioxide (SO{sub 3}) to prevent stack gas opacity related emission problems and minimize air preheater corrosion and fouling. The objective of this project is to improve the purity and solids content of the by-product after it is separated from the gypsum. Several options were investigated to convert it into a more marketable or usable form. Test results and economic evaluations are reported during the different process steps needed to improve the product quality: (1) dissolving or washing out the gypsum impurity; (2) thickening the washed solids and using the overflow for makeup water within the FGD water balance; (3) finding the best means to dewater the washed, thickened slurry; and (4) repulp the dewatered cake into a stabilized slurry or dry it to powder. Flash drying the dewatered cake is compared to spray drying the thickened slurry. FGD Mg(OH){sub 2} is shown to have equal reactivity as an acid neutralization reagent on a Mg(OH){sub 2} molar basis to commercial Mg(OH){sub 2} products and other alkaline reagents. Its use for pH control in wastewater treatment is shown to produce a much smaller sludge volume than lime or sodium hydroxide.

Beeghly, J.H.; Babu, M.; Smith, K.J.

1999-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Scattering of Fast Neutrons by Magnesium  

Science Journals Connector (OSTI)

Angular distributions for the scattering of fast neutrons by magnesium have been obtained for incident neutron energies of 2.0, 3.0, 4.0, and 5.0 Mev. The results for the elastic scattering have been compared with optical model calculations. The results for the inelastic scattering have been compared with calculations based on Hauser-Feshbach theory, and with direct interaction predictions. Over the range of conditions investigated, compound nucleus formation appears to be the dominant mechanism for the inelastic scattering.

D. B. Thomson; L. Cranberg; J. S. Levin

1962-03-15T23:59:59.000Z

142

Fabrication of faceted nanopores in magnesium  

SciTech Connect

In this paper, using high resolution transmission electron microscopy, we showed the fabrication of faceted nanopores with various shapes in magnesium by focused electron beam (e-beam). The characteristics of nanopore shapes and the crystallographic planes corresponding to the edges of the nanopores were discussed in detail. Interestingly, by manipulating the e-beam (e.g., irradiation direction and duration), the nanopore shape and size could be effectively controlled along different directions. Our results provide important insight into the nanopore patterning in metallic materials and are of fundamental importance concerning the relevant applications, such as nanopore-based sensor, etc.

Wu, Shujing; Cao, Fan; Zheng, He; Sheng, Huaping; Liu, Chun; Liu, Yu; Zhao, Dongshan; Wang, Jianbo, E-mail: wang@whu.edu.cn [School of Physics and Technology, Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-Structures, Wuhan University, Wuhan 430072 (China)] [School of Physics and Technology, Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-Structures, Wuhan University, Wuhan 430072 (China)

2013-12-09T23:59:59.000Z

143

Transuranic interfacial reaction studies on manganese oxidemineral surfaces  

SciTech Connect

Several DOE sites have been contaminated by transuranicradionuclide (TRU) discharges including neptunium and plutonium. Theirinteraction with the surrounding geological media can affect thetransport and remediation of these radionuclides in the environment.Manganese based minerals, present as minor phases in the vadose zone, canpreferentially sequester TRU over other minerals present in largerquantities. The objective of this project is to understand theinteractions between plutonium and neptunium and manganese oxyhydroxideminerals to predict potential hazards they represent to the environment,as well as to provide important scientific information for the design ofeffective remediation strategies for contaminated DOE sites.

Shaughnessy, Dawn A.; Nitsche, Heino; Serne, R. Jeffrey; Shuh,David K.; Waychunas, Glenn A.; Booth, Corwin H.; Cantrell, Kirk J.

2002-05-15T23:59:59.000Z

144

Climate VISION: Private Sector Initiatives: Magnesium: Resources and Links  

Office of Scientific and Technical Information (OSTI)

Technical Information Technical Information Publications CD-ROMs Publications The following publications are available for download as Adobe PDF documents. Download Acrobat Reader Cooperative Study of Magnesium Melt Protection Technologies: Emissions Characterization and Occupational Exposure. (PDF 275 KB) EPA Conference on SF6 and the Environment (2006) presentation by Holger Brandt, Lunt Manufacturing, and Scott Bartos, U.S. EPA. The Alternatives to SF6 for Magnesium Melt Protection brochure, published in Chinese, English, and Japanese language versions, was first introduced to the industry and public at the 63rd Annual World Magnesium Conference in Beijing, China on May 21, 2006. EPA collaborated with the International Magnesium Association (IMA), China Magnesium Association (CMA), and Japan

145

THE STATE OF MANGANESE IN THE PHOTOSYNTHETIC APPARATUS. I. EXAFS STUDIES ON CHLOROPLASTS AND di-u-oxo BRIDGED di-MANGANESE MODEL COMPOUNDS  

SciTech Connect

Extended X-ray Absorption Fine Structure (EXAFS) studies on the manganese contained in spinach chloroplasts and on certain di-u-oxo bridged manganese dimers of the form (X{sub 2}Mn)O{sub 2}(MnX{sub 2} (X=2,2'-bypyridine and 1,10-phenanthroline) are reported. From these studies, the manganese associated with photosynthetic oxygen evolution is suggested to occur as a bridged transition metal dimer with most likely another manganese. Extensive details on the analysis are included.

Kirby, J.A.; Robertson, A.S.; Smith, J.P.; Thompson, A.C.; Thompson, A.C.; Klein, M.P.

1980-11-01T23:59:59.000Z

146

First-principles calculations of twin-boundary and stacking-fault energies in magnesium  

E-Print Network (OSTI)

First-principles calculations of twin-boundary and stacking-fault energies in magnesium Y. Wang and stacking faults in metal magnesium have been calculated using first-principles supercell approach. Four. Keywords: Magnesium; Interfaces; Twinning; First-principles calculation Magnesium alloys are increasingly

Chen, Long-Qing

147

Sulfates on Mars: A systematic Raman spectroscopic study of hydration states of magnesium sulfates  

E-Print Network (OSTI)

Sulfates on Mars: A systematic Raman spectroscopic study of hydration states of magnesium sulfates of magnesium sulfates on the martian surface. In situ identification of the hydration states of magnesium of magnesium sulfate. Characteristic and distinct Raman spectral patterns were observed for each of the 11

148

Spinelolivine magnesium isotope thermometry in the mantle and implications for the Mg isotopic composition of Earth  

E-Print Network (OSTI)

Spinel­olivine magnesium isotope thermometry in the mantle and implications for the Mg isotopic: magnesium isotopes mantle geochemistry meteorites MC-ICPMS The magnesium isotopic composition of Earth., 2004; Poitrasson et al., 2005; Georg et al., 2007; Poitrasson, 2007; Weyer et al., 2007). Magnesium

Manning, Craig

149

Manganese Based Oxidative Technologies For Water/Wastewater Treatment  

E-Print Network (OSTI)

NaNO3. The vessel was then spiked with manganese oxide to achieve a specified oxide concentration. The reactor solution was stirred using a Teflon coated magnetic stirrer for an hour before the reaction’s initiation. This process ensured...

Desai, Ishan

2013-08-27T23:59:59.000Z

150

Manganese-oxidizing photosynthesis before the rise of cyanobacteria  

E-Print Network (OSTI)

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

Fischer, Woodward

151

Potassium emission absorption system. Topical report 12  

SciTech Connect

The Potassium Emission Absorption System is one of the advanced optical diagnostics developed at Mississippi State University to provide support for the demonstration of prototype-scale coal-fired combustion magnetohydrodynamic (MHD) electrical power generation. Intended for application in the upstream of an MHD flow, the system directly measures gas temperature and neutral potassium atom number density through spectroscopic emission absorption techniques. From these measurements the electron density can be inferred from a statistical equilibrium calculation and the electron conductivity in the MHD channel found by use of an electron mobility model. The instrument has been utilized for field test measurements on MHD facilities for almost a decade and has been proven to provide useful measurements as designed for MHD nozzle, channel, and diffuser test sections. The theory of the measurements, a system description, its capabilities, and field test measurement results are reported here. During the development and application of the instrument several technical issues arose which when addressed advanced the state of the art in emission absorption measurement. Studies of these issues are also reported here and include: two-wavelength measurements for particle-laden flows, potassium D-line far wing absorption coefficient, bias in emission absorption measurements arising from dirty windows and misalignments, non-coincident multiwavelength emission absorption sampling errors, and lineshape fitting for boundary layer flow profile information. Although developed for NLHD application, the instrument could be applied to any high temperature flow with a resonance line in the 300 to 800 nm range, for instance other types of flames, rocket plumes or low temperature plasmas.

Bauman, L.E.

1995-04-01T23:59:59.000Z

152

An EPR study of ¹?O? on magnesium oxide  

E-Print Network (OSTI)

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...

Wong, Ning-Bew

2012-06-07T23:59:59.000Z

153

Process for converting magnesium fluoride to calcium fluoride  

DOE Patents (OSTI)

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.

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

1984-12-21T23:59:59.000Z

154

It's Elemental - Isotopes of the Element Magnesium  

NLE Websites -- All DOE Office Websites (Extended Search)

Sodium Sodium Previous Element (Sodium) The Periodic Table of Elements Next Element (Aluminum) Aluminum Isotopes of the Element Magnesium [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 24 78.99% STABLE 25 10.00% STABLE 26 11.01% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 19 4.0 picoseconds Double Proton Emission 100.00% 20 90.8 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission ~ 27.00% 21 122 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission 32.60% Electron Capture with delayed Alpha Decay < 0.50%

155

E-Print Network 3.0 - aluminum potassium sulfate Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Kelvin KOH potassium hydroxide KOtBu potassium-tert-butoxide KPA potassium... Light Emitting Diode LiAlH4 lithium aluminum hydride LiF lithium ... Source: Groningen,...

156

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

ScienceCinema (OSTI)

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

Bruce Cook

2013-06-05T23:59:59.000Z

157

Magnesium-Intensive Front End Sub-Structure Development  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Project ID "LM077" USAMP AMP800 1 2013 DOE Merit Review Presentation Alan A. Luo General Motors Global Research and Development May 16, 2013 Magnesium-Intensive Front End...

158

Microplasticity and fatigue of some magnesium-lithium alloys  

Science Journals Connector (OSTI)

Cyclic stress-strain curves have been obtained for a series of magnesium-lithium alloys with lithium contents up to 12. 5wt%. The ... hardening exponents for stresses leading to failure in excess of 104...cycles ...

R. E. Lee; W. J. D. Jones

1974-03-01T23:59:59.000Z

159

Magnesium Front End Research And Development (AMD604) | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Research And Development (AMD604) Magnesium Front End Research And Development (AMD604) Presentation from the U.S. DOE Office of Vehicle Technologies "Mega" Merit Review 2008 on...

160

Magnesium and Copper (II) Chloride: A Curious Redox Reaction .  

E-Print Network (OSTI)

??The focus of this research is to follow the oxidation-reduction reaction of solid magnesium metal and an aqueous solution of copper (II) chloride (CuCl2), both… (more)

Mannard, Moira

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

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

SciTech Connect

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

Bruce Cook

2012-08-18T23:59:59.000Z

162

E-Print Network 3.0 - acid potassium glycyrrhetinate Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

provides some chemicals which are incompatible with other compounds. Summary: Potassium carbon tetrachloride, carbon dioxide, water Potassium chlorate sulfuric and other acids...

163

Determination of boron in aluminum and aluminum-magnesium alloy by charged particle activation analysis  

SciTech Connect

Charge particle activation analysis is applied to the determination of boron in aluminum and aluminum-magnesium alloy. The /sup 10/B(p,..cap alpha..)/sup 7/Be, the /sup 10/B(d,..cap alpha..n)/sup 7/Be, and the /sup 10/B(d,n)/sup 11/C reactions are used. Proton activation allows an instrumental determination. When the /sup 10/B(d,..cap alpha..n)/sup 7/Be reaction is used, beryllium-7 is separated from the matrix by liquid-liquid extraction; beryllium acetylacetonate is extracted with carbon tetrachloride after complexation of other metal ions with ethylenediaminetetraacetic acid. After back extraction beryllium is precipitated as beryllium hydroxide and heated to beryllium oxide. When the /sup 10/B(d,n)/sup 11/C reaction is used, carbon-11 is separated as carbon dioxide by dissolution of the sample in a mixture of sulfuric acid, phosphoric acid, water, and potassium dichromate. The chemical yield of both separation methods was determined. The results obtained have a relative standard deviation of 5-9% at the 1-33 ..mu..g/g concentration. The different nuclear reactions yield results that are in good mutual agreement and also agree satisfactorily with those of nonnuclear analytical methods.

Mortier, R.; Vandecasteele, C.; Strijckmans, K.; Hoste, J.

1984-10-01T23:59:59.000Z

164

Reversible oxidation and rereduction of magnesium phthalocyanine electrodes. Electrochemical behavior and in situ Raman spectroscopy  

SciTech Connect

Reversible oxidation and rereduction of magnesium phthalocyanine (MgPc) thin films (1000-2000 A thick) on gold electrodes have been observed in the potential range from 0.0 to 0.9 V vs. SCE in various electrolytes, including aqueous NaCl, NaNO/sub 3/, NaClO/sub 4/, and potassium hydrogen phthalate (KHP). In situ Raman spectra recorded during oxidation and rereduction show spectral changes in the 400-1800-cm/sup -1/ range that can be related to the vibrational modes of ring structures in MgPc, hence the oxidation seems to occur in the ligand. The spectroscopic results unambiguously demonstrate the movement of anions into and out of the electrode during oxidation and rereduction processes. Both cyclic voltammetry and chronocoulometry showed that smaller anions allow full oxidation at rapid rates, whereas larger ones inhibit the oxidation, at least with respect to rate. Auger electron spectrometry showed that anions appear to be homogeneously distributed in partially oxidized films.

Kahl, J.L.; Faulkner, L.R.; Dwarakanath, K.; Tachikawa, H.

1986-09-03T23:59:59.000Z

165

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

E-Print Network (OSTI)

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...

Roche, Neil Gerard

2012-06-07T23:59:59.000Z

166

Deuterium depletion and magnesium enhancement in the local disc  

E-Print Network (OSTI)

The local disc deuter is known to be depleted in comparison to the local bubble. We show, that the same lines of sight that are depleted in deuter, are enhanced in magnesium. Heavier elements - Si and Fe do not show any difference in the abundance between the local disc and the local bubble. This observation implicates that astration is responsible for both deuter depletion and magnesium enhancement.

Piotr Gnacinski

2005-07-19T23:59:59.000Z

167

It's Elemental - Isotopes of the Element Potassium  

NLE Websites -- All DOE Office Websites (Extended Search)

Argon Argon Previous Element (Argon) The Periodic Table of Elements Next Element (Calcium) Calcium Isotopes of the Element Potassium [Click for Main Data] Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information. Naturally Occurring Isotopes Mass Number Natural Abundance Half-life 39 93.2581% STABLE 40 0.0117% 1.248×10+9 years 41 6.7302% STABLE Known Isotopes Mass Number Half-life Decay Mode Branching Percentage 32 No Data Available Proton Emission (suspected) No Data Available 33 < 25 nanoseconds Proton Emission No Data Available 34 < 25 nanoseconds Proton Emission No Data Available 35 178 milliseconds Electron Capture 100.00% Electron Capture with delayed Proton Emission 0.37% 36 342 milliseconds Electron Capture 100.00%

168

Alternatives for sodium-potassium alloy treatment  

SciTech Connect

Sodium-potassium alloy (NaK) is currently treated at the Y-12 Plant by open burning. Due to uncertainties with future permits for this process alternative treatment methods were investigated, revealing that two treatment processes are feasible. One process reacts the NaK with water in a highly concentrated molten caustic solution (sodium and potassium hydroxide). The final waste is a caustic that may be used elsewhere in the plant. This process has two safety concerns: Hot corrosive materials used throughout the process present handling difficulties and the process must be carefully controlled (temperature and water content) to avoid explosive NaK reactions. To avoid these problems a second process was developed that dissolves NaK in a mixture of propylene glycol and water at room temperature. While this process is safer, it generates more waste than the caustic process. The waste may possibly be used as a carbon food source in biological waste treatment operations at the Y-12 Plant. Experiments were conducted to demonstrate both processes, and they showed that both processes are feasible alternatives for NaK treatment. Process flow sheets with mass balances were generated for both processes and compared. While the caustic process generates less waste, the propylene glycol process is safer in several ways (temperature, material handling, and reaction control). The authors recommend that the propylene glycol alternative be pursued further as an alternative for NaK treatment. To optimize this process for a larger scale several experiments should be conducted. The amount of NaK dissolved in propylene glycol and subsequent waste generated should be optimized. The offgas processes should be optimized. The viability of using this waste as a carbon food source at one of the Y-12 Plant treatment facilities should be investigated. If the state accepts this process as an alternative, design and construction of a pilot-scale treatment system should begin.

Takacs, T.J.; Johnson, M.E.

1993-04-08T23:59:59.000Z

169

The relationship of nutritional manganese to the development of postmenopausal osteopenia in rats  

E-Print Network (OSTI)

intake, and other studies have not demonstrated a long-term effect of calcium supplementation. Minerals other than calcium are essential to the integrity of bone tissue. Among these are phosphorus, copper, fluorine, zinc and manganese. Manganese... and Lowther 1976). Original investigations of bone mineralization, density, strength, and ash content have been noted to be lower in manganese deficiency, with calcium and phosphorus remaining unchanged (Asling and Hurley 1963). Bone density and breaking...

Miyasato, Jan Leiko

2012-06-07T23:59:59.000Z

170

Thermal expansion of manganese dioxide using high-temperature in situ X-ray diffraction  

Science Journals Connector (OSTI)

The thermal expansion behaviour of manganese dioxide, an important battery material, is reported using high-temperature in situ X-ray diffraction between 298 and 673 K.

Dose, W.M.

2013-08-03T23:59:59.000Z

171

OBSERVATIONS IN REACTIVITY BETWEEN BH CONTAINING COMPOUNDS AND ORGANOMETALLIC REAGENTS: SYNTHESIS OF BORONIC ACIDS, BORONIC ESTERS, AND MAGNESIUM HYDRIDES  

E-Print Network (OSTI)

Reaction of BH 3 :THF with magnesium hydride byproduct. A.It was also observed that magnesium hydride can partiallyACIDS, BORONIC ESTERS, AND MAGNESIUM HYDRIDES A dissertation

Clary, Jacob William

2012-01-01T23:59:59.000Z

172

K-Shell Photoabsorption of Magnesium Ions  

E-Print Network (OSTI)

X-ray photoabsorption cross sections have been computed for all magnesium ions using the R-matrix method. A comparison with the other available data for Mg II- Mg X shows good qualitative agreement in general. However, for the lower ionization stages, and for singly-ionized Mg II in particular, the previous R-matrix results (Witthoeft et al. 2009; Witthoeft et al. 2011) overestimate the K-edge position due to the absence of important orbital relaxation effects in those earlier calculations, and a global shift downward in photon energy of those cross sections is therefore warranted. The resultant resonance shapes are found to be quite similar between the two R-matrix results, on the other hand. The cross sections for Mg I and Mg II are further complicated by the M-shell (n=3) occupancy. As a result, the treatment of spectator Auger decay of 1s-> np resonances using the multichannel quantum defect, optical potential method becomes problematic, and it was necessary to implement an alternative, approximate treatm...

Hasoglu, M F; Gorczyca, T W

2013-01-01T23:59:59.000Z

173

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

E-Print Network (OSTI)

) The factors that regulate the intestinal absorption of magnesium are poorly understood. In humans, magnesium is absorbed mainly in the jejunum and the ileum and through an active transport mechanism (9). The level of intake of magnesium rnfluences its... of magnesium (7) Homeostatic controls have been reported to maintarn magnesium balance by renal and to a lesser degree by gastrointestinal mechanisms (8, 9). When the intake of magnesium is decreased, the urinary excretion decreases. However...

McLaughlin, Cynthia Anne

2012-06-07T23:59:59.000Z

174

Levels of magnesium compounds of different solubility in predominant soil types in Lithuania, effects on agricultural plants.  

E-Print Network (OSTI)

??In Europe the views on the demand of magnesium by agricultural plants as well as on the need for magnesium fertilization are different. In European… (more)

Rutkauskien?, Rasa

2013-01-01T23:59:59.000Z

175

Magnesium isotopic systematics of chondrules and CAIs from Allende, Murchison, Murray and Bjurbole. F.-, M. Wadhwa1,  

E-Print Network (OSTI)

Magnesium isotopic systematics of chondrules and CAIs from Allende, Murchison, Murray and Bjurbole: Magnesium isotopic analyses were performed at the Isotope Geochemistry Labora- tory of the Field Museum

Grossman, Lawrence

176

Selective Aerobic Oxidation of 5-Hydroxymethylfurfural in Water Over Solid Ruthenium Hydroxide Catalysts with Magnesium-Based Supports  

Science Journals Connector (OSTI)

Solid catalyst systems comprised of ruthenium hydroxide supported on magnesium-based carrier materials (spinel, magnesium oxide and hydrotalcite) were investigated for the selective, aqueous aerobic oxidation of ...

Yury Y. Gorbanev; Søren Kegnæs; Anders Riisager

2011-12-01T23:59:59.000Z

177

Pilot plant for CO2 capture with aqueous piperazine/potassium carbonate , Gary T. Rochelle1  

E-Print Network (OSTI)

GHGT-8 1 Pilot plant for CO2 capture with aqueous piperazine/potassium carbonate Eric Chen1 , Gary pilot for CO2 capture was successfully operated using potassium carbonate promoted with piperazine, potassium carbonate, piperazine Introduction Several amine-promoted potassium carbonate solvents have been

Rochelle, Gary T.

178

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

E-Print Network (OSTI)

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...

Lee, Samuel Ming Hin

2013-02-22T23:59:59.000Z

179

Switchable Mirrors Based on Nickel-Magnesium Films  

NLE Websites -- All DOE Office Websites (Extended Search)

Switchable Mirrors Based on Nickel-Magnesium Films Switchable Mirrors Based on Nickel-Magnesium Films Title Switchable Mirrors Based on Nickel-Magnesium Films Publication Type Journal Article LBNL Report Number LBNL-47180 Year of Publication 2001 Authors Richardson, Thomas J., Jonathan L. Slack, Robert D. Armitage, Robert Kostecki, Baker Farangis, and Michael D. Rubin Journal Applied Physics Letters Volume 78 Pagination 3047 Call Number LBNL-47180 Abstract An 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 cathodic polarization 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.

180

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate Fourth Quarterly Report 2005 Quarterly Progress. #12;3 Abstract The objective of this work is to improve the process for CO2 capture by alkanolamine

Rochelle, Gary T.

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate Third Quarterly Report 2005 Quarterly Progress. #12;3 Abstract The objective of this work is to improve the process for CO2 capture by alkanolamine

Rochelle, Gary T.

182

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate First Quarterly Report 2006 Quarterly Progress the process for CO2 capture by alkanolamine absorption/stripping by developing an alternative solvent, aqueous

Rochelle, Gary T.

183

Nature of Bridging Bonds in Lithium and Potassium Acetate Dimers  

Science Journals Connector (OSTI)

The structures of lithium and potassium acetates were studied by the RHF/6-31G*...3COOLi)2 and (CH3COOK)2 are electrostatic in nature. The bridging lithium bond is intermediate between hydrogen and ionic, ... of ...

I. A. Panteleev; S. G. Semenov; D. N. Glebovskii

184

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

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

2 - Development of High Volume Warm Forming of Low Cost Magnesium Sheet edm2@chrysler.com February 28, 2008 Development of High-Volume Warm Forming of Low- Cost Magnesium Sheet...

185

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

Energy Savers (EERE)

Development of High-Volume Warm Forming of Low-Cost Magnesium Sheet Development of High-Volume Warm Forming of Low-Cost Magnesium Sheet 2010 DOE Vehicle Technologies and Hydrogen...

186

Magnesium and memantine do not inhibit nociceptive neuronal activity in the trigeminocervical complex of the rat  

Science Journals Connector (OSTI)

Experimental studies with NMDA receptor antagonists, such as magnesium and memantine, have demonstrated the ability of these substances ... using the open channel blockers, magnesium and memantine, we studied the...

J Hoffmann; JW Park; RJ Storer; PJ Goadsby

2013-02-01T23:59:59.000Z

187

E-Print Network 3.0 - alumina-rich magnesium aluminate Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

(3 pm... , but no evidence of evaporative loss is seen. The inclusion has a Group II REE pattern and a normal magnesium... ) and SYLVESTER etal. ( 1993). Magnesium, Al, Ti, Mn....

188

Planned Emplacement of Magnesium Oxide in the WIPP Repository 1.0 Overview  

E-Print Network (OSTI)

Planned Emplacement of Magnesium Oxide in the WIPP Repository 1.0 Overview In December 2002 received approval to dispose of AMWTF's supercompacted waste provided magnesium oxide (MgO), the approved

189

Thermal Conductivity of Ordered Mesoporous Nanocrystalline Silicon Thin Films Made from Magnesium Reduction of Polymer-  

E-Print Network (OSTI)

Thermal Conductivity of Ordered Mesoporous Nanocrystalline Silicon Thin Films Made from Magnesium-assembly of mesoporous silica followed by magnesium reduction. The periodic ordering of pores in mesoporous silicon

Pilon, Laurent

190

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

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Development of High-Volume Warm Forming of Low-Cost Magnesium Sheet Development of High-Volume Warm Forming of Low-Cost Magnesium Sheet Presentation from the U.S. DOE Office of...

191

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

E-Print Network (OSTI)

Magnesium-rich crustal compositions on Mercury: Implications for magmatism from petrologic modeling: Stockstill-Cahill, K. R., T. J. McCoy, L. R. Nittler, S. Z. Weider, and S. A. Hauck II (2012), Magnesium

Hauck II, Steven A.

192

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

NLE Websites -- All DOE Office Websites (Extended Search)

Magnesium 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...

193

The Kinetics and Magnesium Requirements for the Folding of Antigenomic Ribozymes  

E-Print Network (OSTI)

The Kinetics and Magnesium Requirements for the Folding of Antigenomic Ribozymes Sirinart of antigenomic ri- bozyme was studied, it is demonstrated that its L3 loop requires magnesium and, apparently

Perreault, Jean-Pierre

194

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

E-Print Network (OSTI)

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...

Zuniga, David

2006-10-30T23:59:59.000Z

195

Carbon Dioxide Capture by Absorption with Potassium Carbonate  

NLE Websites -- All DOE Office Websites (Extended Search)

Carbon Dioxide Capture by Absorption Carbon Dioxide Capture by Absorption with Potassium Carbonate Background Although alkanolamine solvents, such as monoethanolamine (MEA), and solvent blends have been developed as commercially-viable options for the absorption of carbon dioxide (CO 2 ) from waste gases, natural gas, and hydrogen streams, further process improvements are required to cost-effectively capture CO 2 from power plant flue gas. The promotion of potassium carbonate (K

196

Performance of MHD insulating materials in a potassium environment  

SciTech Connect

The objectives of this study are to evaluate the compatibility of the MHD insulating materials boron nitride and silicon nitride in a potassium environment at temperatures of 1000 and 1400{degrees}F (538 and 760{degrees}C, respectively) and to measure the electrical conductivities of the specimens before and after exposure to potassium. Based on the test results, an assessment is to be made of the suitability of these materials for application as insulator materials in an MHD channel.

Natesan, K.; Park, J.H.; Rink, D.L. (Argonne National Lab., IL (United States)); Thomas, C.A. (USDOE Pittsburgh Energy Technology Center, PA (United States))

1991-12-01T23:59:59.000Z

197

E-Print Network 3.0 - az91d magnesium alloy Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

alloy Search Powered by Explorit Topic List Advanced Search Sample search results for: az91d magnesium alloy...

198

E-Print Network 3.0 - az31 magnesium alloy Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

alloy Search Powered by Explorit Topic List Advanced Search Sample search results for: az31 magnesium alloy...

199

E-Print Network 3.0 - az91d magnesium alloys Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

alloys Search Powered by Explorit Topic List Advanced Search Sample search results for: az91d magnesium alloys...

200

E-Print Network 3.0 - az31 magnesium alloys Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

alloys Search Powered by Explorit Topic List Advanced Search Sample search results for: az31 magnesium alloys...

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Where plants make oxygen: a structural model for the photosynthetic oxygen-evolving manganese cluster  

Science Journals Connector (OSTI)

...MANGANESE O2-EVOLVING COMPLEX AND THE IRON QUINONE ACCEPTOR COMPLEX IN PHOTOSYSTEM-II...MANGANESE(III) - ANALOGS OF THE DI-IRON(III) CENTER IN HEMERYTHRIN, JOURNAL...Mn(IV)(sal)2(bipy) (acac, acetylacetonate; bipy, R:Mn(II) bipyridine; and...

VK Yachandra; VJ DeRose; MJ Latimer; I Mukerji; K Sauer; MP Klein

1993-04-30T23:59:59.000Z

202

Coupled anoxic nitrification/manganese reduction in marine sediments STEFAN HULTH,1,  

E-Print Network (OSTI)

Coupled anoxic nitrification/manganese reduction in marine sediments STEFAN HULTH,1, * ROBERT C distributions of oxygen, manganese, and nitrogen from hemipelagic and shelf sediments sometimes indicate a close by biological reworking of Mn-oxide-rich surface sediments into underlying anoxic zones. Surface sediment from

Boyer, Edmond

203

Engineering and characterization of human manganese superoxide dismutase mutants with high activity and low  

E-Print Network (OSTI)

Engineering and characterization of human manganese superoxide dismutase mutants with high activity2 and Huimin Zhao1 1 Departments of Chemical Engineering and Biomolecular Engineering, and Chemistry. Each monomer has at its center a manganese (II) / (III) ion, which is surrounded in a trigonal

Zhao, Huimin

204

BACKGROUND REVIEW OF THE BRUSH BERYLLIUM AND DIAMOND MAGNESIUM PLANTS  

Office of Legacy Management (LM)

BACKGROUND REVIEW OF THE BRUSH BERYLLIUM AND DIAMOND MAGNESIUM PLANTS BACKGROUND REVIEW OF THE BRUSH BERYLLIUM AND DIAMOND MAGNESIUM PLANTS IN LUCKEY, OHIO October 27, 1989 Prepared for: U.S. Department of Energy Formerly Utilized Sites Remedial Action Program Prepared by: R.F. Weston/Office of Technical Services BACKGROUND REVIEW OF THE BRUSH BERYLLIUM AND DIAMOND MAGNESIUM PLANTS IN LUCKEY, OHIO INTRODUCTION The Department of Energy (DOE) is conducting a program to identify and examine the radiological conditions at sites used in the early years of nuclear energy development by the U.S. Army Corps of Engineer's Manhattan Engineer District (MED) and the Atomic Energy Commission (AEC). This program, the Formerly Utilized Sites Remedial Action Program (FUSRAP), is administered by the Assistant Secretary for Nuclear Energy through the

205

On the Modeling of Plastic Deformation of Magnesium Alloys  

SciTech Connect

Magnesium alloys are promising materials due to their low density and therefore high specific strength. However, the industrial application is not well established so far, especially for wrought products such as sheets or profiles. Due to its hexagonal crystallographic structure, deformation mechanisms observed in magnesium alloys are rather different from those in face centered cubic metals such as aluminum alloys. This leads not only to a mechanical anisotropy, but also to a tension-compression asymmetry, i.e. unequal compressive and tensile yield strength. The resulting complexity in the yielding behavior of such materials cannot be captured by conventional models of J2 plasticity. Cazacu and Barlat, therefore, proposed a phenomenological yield potential which accounts for the respective phenomena by introducing the third invariant of the stress tensor. Simulations based on this model are performed with ABAQUS/Explicit and a user defined routine VUMAT for validating the respective implementation. The application aims at simulating the extrusion process of magnesium alloys.

Ertuerk, S.; Steglich, D.; Bohlen, J.; Letzig, D.; Brocks, W. [GKSS Research Center, Institute of Materials Research, Max-Plank-Str., D-21502 Geesthacht (Germany)

2007-05-17T23:59:59.000Z

206

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

SciTech Connect

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.

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

207

Friction Tests in Magnesium Tube Hydroforming at Elevated Temperatures  

SciTech Connect

In metal forming, lubricants have a variety of functions. The top priority is usually reduction of friction in order to increase the formability of the materials and reduce tool wear. Because magnesium alloys have very poor formability at room temperature, it is essential to manufacture a part from Magnesium alloys at elevated temperatures. The aim of this paper is to present a friction test method to evaluate the performance of different kinds of lubricants and determine their coefficients of friction at elevated temperatures in tube hydroforming of magnesium alloys. A self-designed experimental apparatus is used to carry out the experiments of friction tests. The coefficient of friction between the tube and die at guiding zone is determined. The effects of the internal pressure, the axial feeding velocity and temperatures on the friction forces and coefficients of friction for different lubricants are discussed.

Hwang, Yeong-Maw; Wang, Kuo-Hsing; Kuo, Tsung-Yu [National Sun Yat-Sen University-Department of Mechanical and Electro-mechanical Engineering, No.70, Lien-Hai Rd., Kaohsiung, Taiwan (China)

2011-05-04T23:59:59.000Z

208

Chemical Preparation of Pure and Strontium-and/or Magnesium-Doped Lanthanum Gallate Powders  

E-Print Network (OSTI)

Chemical Preparation of Pure and Strontium- and/or Magnesium-Doped Lanthanum Gallate Powders A. Cu) ceramics that have been doped with strontium and/or magnesium are known to have superior oxygen re- cently synthesized strontium- and magnesium-doped LaGaO3 ceramics, using the conventional "solid

Tas, A. Cuneyt

209

Magnesium and titanium: "The odd couple" Local order and the influence of stress on the  

E-Print Network (OSTI)

Magnesium and titanium: "The odd couple" Local order and the influence of stress on the hydrogen (Sweden) Cover: The graph on the cover is a collection of loading isotherms measured on magnesium thin UNIVERSITEIT Magnesium and titanium: "The odd couple" Local order and the influence of stress on the hydrogen

Dam, Bernard

210

Magnesium metabolism in growing pigs A. POINTILLART, Michle ESTABLIER Nicole FONTAINE,  

E-Print Network (OSTI)

Magnesium metabolism in growing pigs A. POINTILLART, Michèle ESTABLIER Nicole FONTAINE, Colette meal) and semi- synthetic (casein and starch) diets with various levels of calcium, magnesium, the faecal and urinary excretion as well as the absorption and retention of magnesium depended on the dietary

Paris-Sud XI, Université de

211

MAGNESIUM ISOTOPIC COMPOSITION OF CAIs AND CHONDRULES FROM CR CHONDRITES. B. , M. Gounelle1  

E-Print Network (OSTI)

MAGNESIUM ISOTOPIC COMPOSITION OF CAIs AND CHONDRULES FROM CR CHONDRITES. B. Mimoun1 , M. Gounelle1. Introduction: The magnesium isotopic composi- tion of primitive extraterrestrial materials is worth measuring.g. 10]. Figure 1: The magnesium isotopic composition of CAIs in CR chondrites. Error bars are 1

Technische Universiteit Delft

212

Mass Flow Control in a Magnesium Hall-effect Thruster Mark A. Hopkins*  

E-Print Network (OSTI)

Mass Flow Control in a Magnesium Hall-effect Thruster Mark A. Hopkins* , Jason M. Makela , Robert L reported in this paper examined methods of operating a Hall-effect thruster on solid magnesium propellant University began performing experiments using magnesium and zinc as propellants for a Hall-effect thruster1

King, Lyon B.

213

The effect of cooling rate on thermophysical properties of magnesium alloys  

E-Print Network (OSTI)

ARTICLES The effect of cooling rate on thermophysical properties of magnesium alloys M.N. Khan magnesium alloys (AZ91D, AM60B, and AE44) have been studied. Phase-transformation temperatures and enthalpy behavior of magnesium alloys, but the effect of cooling rate on phase-transformation temperatures

Medraj, Mamoun

214

IEEE TRANSACTIONS ON MAGNETICS, VOL. 47, NO. 6, JUNE 2011 1545 Spin Injection Into Magnesium Nanowire  

E-Print Network (OSTI)

IEEE TRANSACTIONS ON MAGNETICS, VOL. 47, NO. 6, JUNE 2011 1545 Spin Injection Into Magnesium and Technology Beijing, Beijing 100083, China Spin injection into magnesium from Permalloy is performed nanowires. The short spin diffusion length of magnesium which has a small spin-orbit interaction can

Otani, Yoshichika

215

RNA-Magnesium-Protein Interactions in Large Ribosomal Subunit Anton S. Petrov,,  

E-Print Network (OSTI)

RNA-Magnesium-Protein Interactions in Large Ribosomal Subunit Anton S. Petrov,,§ Chad R. Bernier of Technology, Atlanta, Georgia 30332, United States ABSTRACT: Some of the magnesium ions in the ribosome are coordinated by multiple rRNA phosphate groups. These magnesium ions link distal sequences of rRNA, primarily

Williams, Loren

216

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 and coordination of the magnesium and transition metal atoms during hydrogen absorption were studied using dynamic

217

The Effect of Magnesium Coordination on the and "N Magnetic Resonance Spectra of Chlorophyll a.  

E-Print Network (OSTI)

7058 The Effect of Magnesium Coordination on the and "N Magnetic Resonance Spectra of Chlorophyll a magnesium-free derivative pheophytin a have been assigned. Emphasis is placed on the quaternary carbon atoms was developed to permit these assign- ments. On complexation with magnesium, large downfield chemical

Boxer, Steven G.

218

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

E-Print Network (OSTI)

In vitro corrosion and biocompatibility of binary magnesium alloys Xuenan Gu a , Yufeng Zheng a 2 September 2008 Accepted 21 October 2008 Available online 9 November 2008 Keywords: Magnesium alloy Corrosion In vitro Cytotoxicity Hemocompatibility a b s t r a c t As bioabsorbable materials, magnesium

Zheng, Yufeng

219

Ordered magnesium-lithium alloys: First-principles predictions Richard H. Taylor  

E-Print Network (OSTI)

Ordered magnesium-lithium alloys: First-principles predictions Richard H. Taylor Department 2010 Magnesium-lithium Mg-Li alloys are among the lightest structural materials. Although considerable Emerging technologies increasingly depend on the pro- duction of ultralight-weight materials. Magnesium

Hart, Gus

220

Mineral bone composition and some elements of calcium metabolism in magnesium-deficient growing rats  

E-Print Network (OSTI)

Mineral bone composition and some elements of calcium metabolism in magnesium-deficient growing-Chomponelle, Theix, 63110 Beaumont, France. Summary. (1) Magnesium deficiency was induced in Sprague-Dawley male rats of deprivation. (3) The leg bones were fragmented as shown in figure 1. Their magnesium content had decreased

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

MAGNESIUM ABSORPTION IN THE CCUM OF RATS RELATED TO VOLATILE FATTY ACIDS PRODUCTION  

E-Print Network (OSTI)

MAGNESIUM ABSORPTION IN THE C�CUM OF RATS RELATED TO VOLATILE FATTY ACIDS PRODUCTION Y. RAYSSIGUIER RELATIONS ENTRE L'ABSORPTION C,4ECALE DE MAGNESIUM CHEZ LE RAT ET LA PRODUCTION D'ACIDES GRAS VOLATILS du caecum, pH, acides gras volatils, activité microbienne. Introduction The mode of magnesium

Paris-Sud XI, Université de

222

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

E-Print Network (OSTI)

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

Maume-Deschamps, Véronique

223

Effects of Magnesium on Inactivation of the Voltage-gated Calcium Current in  

E-Print Network (OSTI)

Effects of Magnesium on Inactivation of the Voltage-gated Calcium Current in Cardiac Myocytes H-dependent inactivation can be modulated by changes in cytoplasmic Mg~+. INTRODUCTION Magnesium is an important constituent of the intracellular milieu. Despite the importance of magnesium as an essential cofactor

224

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 deficiency of calcium and magnesium may cause problems in dairy cows. Clinical hypocalcaemia most commonly

225

SIMULATION OF POROSITY AND HOT TEARS IN A SQUEEZE CAST MAGNESIUM CONTROL ARM  

E-Print Network (OSTI)

SIMULATION OF POROSITY AND HOT TEARS IN A SQUEEZE CAST MAGNESIUM CONTROL ARM K.D. Carlson1 , C: Magnesium Alloys, Casting, Shrinkage Porosity, Hot Tears, Modeling Abstract Simulations are performed and hot tears in squeeze casting of magnesium alloys. Introduction Both shrinkage porosity and hot tears

Beckermann, Christoph

226

Effects of magnesium ions on the stabilization of RNA oligomers of defined structures  

E-Print Network (OSTI)

Effects of magnesium ions on the stabilization of RNA oligomers of defined structures MARTIN J as a function of magnesium ion concentration. The oligomers included helices composed of Watson­Crick base pairs could best be interpreted as nonspecific binding of metal ions to the RNAs. The effect of magnesium ions

Westhof, Eric

227

Serum proteins in magnesium-deficient rat Y. RAYSSIGUIER P. LARVOR Y. AUGUSTI J. DURLACH  

E-Print Network (OSTI)

Serum proteins in magnesium-deficient rat Y. RAYSSIGUIER P. LARVOR Y. AUGUSTI J. DURLACH (1 Cochin, Paris Summary. Hypoproteinemia appears early in the magnesium-deficient rat with a drop in serum. In the magnesium-deficient rat, we have shown serum protein modifications related to immunologic and allergic

Paris-Sud XI, Université de

228

Charge-exchange collisions in interpenetrating laser-produced magnesium plasmas  

E-Print Network (OSTI)

Charge-exchange collisions in interpenetrating laser-produced magnesium plasmas S.S. HARILAL,1 C charge-exchange collisions between highly charged Mg ions in colliding laser-produced magnesium plasmas magnesium plasmas. 1. INTRODUCTION Several applications of laser-produced plasmas involve an experimental

Harilal, S. S.

229

Novel Magnesium Alloys Developed for Biomedical Application: A Review Nan Li, Yufeng Zheng*  

E-Print Network (OSTI)

Novel Magnesium Alloys Developed for Biomedical Application: A Review Nan Li, Yufeng Zheng* State in the development of magnesium alloys both for industrial and biomedical applications. Industrial interest in magnesium alloys is based on strong demand of weight reduction of transportation vehicles for better fuel

Zheng, Yufeng

230

MAGNESIUM AND ZINC BLOOD LEVELS IN MICE SENSITIVE TO AUDIOGENIC SEIZURES  

E-Print Network (OSTI)

MAGNESIUM AND ZINC BLOOD LEVELS IN MICE SENSITIVE TO AUDIOGENIC SEIZURES J.G. HENROTTE G. FRANCK., 1973 ; Durlach, 1976). Thus, it seemed of interest to study the zinc and magnesium levels in the blood the animals contained 2 % of a mineral mixture composed of magnesium hydroxide (13.8 %), Ca diphosphate (70

Paris-Sud XI, Université de

231

Simulation of Stresses during Casting of Binary Magnesium-Aluminum Alloys  

E-Print Network (OSTI)

Simulation of Stresses during Casting of Binary Magnesium-Aluminum Alloys M.G. POKORNY, C.A. MONROE properties that are suitable for advanced stress modeling is even more limited for magnesium alloys. Recently of an AZ91 magnesium alloy in order to predict hot tears.[4] This study relied on crude estimates

Beckermann, Christoph

232

Surface Analysis of Silica Gel Particles after Mechanical Dry Coating with Magnesium Stearate  

E-Print Network (OSTI)

1 Surface Analysis of Silica Gel Particles after Mechanical Dry Coating with Magnesium Stearate particles (d50 = 55 µm) by coating with different mass ratios of magnesium stearate - MgSt2 (d50 = 4.6 µm Group). Keywords: AFM phase imaging, adhesion force, dry coating, silica, magnesium stearate. 1

Paris-Sud XI, Université de

233

Does Magnesium Transport Protein (MgtE) Contribute to the Antibiotic Resistance of Pseudomonas aeruginosa?  

E-Print Network (OSTI)

Does Magnesium Transport Protein (MgtE) Contribute to the Antibiotic Resistance of Pseudomonas is more resistant to antibiotics. The purpose of this project was to find out if the magnesium transport by using two different strains of P.aeruginosa; PA14 wild-type and GGA52 mutant (without the magnesium

Zhou, Yaoqi

234

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

E-Print Network (OSTI)

Reliability of Laser Welding Process for ZE41A-T5 Magnesium Alloy Sand Castings Haider Al-Kazzaz1 for magnesium alloys. The process reliability of 2-mm ZE41A-T5 butt joints welded by a 4 kW Nd:YAG laser, reproducibility, Weibull distribution 1. Introduction The applications of magnesium alloys are expanding rapidly

Medraj, Mamoun

235

Evaluation of microstructural eects on corrosion behaviour of AZ91D magnesium  

E-Print Network (OSTI)

Evaluation of microstructural eects on corrosion behaviour of AZ91D magnesium alloy Rajan Ambat(OH)2 with small amounts b phase, magnesium-aluminium oxide and MgH2 while for die-cast, the product: Magnesium alloys; AZ91D; Ingot; Die-cast; Microstructure; Corrosion 0010-938X/00/$ - see front matter 7 2000

Zhou, Wei

236

Above-threshold ionization near the 3p4d 1 autoionizing state in magnesium  

E-Print Network (OSTI)

Above-threshold ionization near the 3p4d 1 Fo autoionizing state in magnesium A. Reber,1 T. Baynard ionization of magnesium from the 3 1 P state in the region of the 3p4d 1 Fo autoionizing resonance, in which of magnesium atoms just inside the focus of a magnetic bottle spectrometer MBS 13 . One laser is tuned

Berry, R. Stephen

237

Inhibition of the ATPase activity of Escherichia coli ATP synthase by magnesium fluoride  

E-Print Network (OSTI)

Inhibition of the ATPase activity of Escherichia coli ATP synthase by magnesium fluoride Zulfiqar activity of Escherichia coli ATP synthase by magnesium fluoride (MgFx) was studied. Wild-type F1-ATPase synthesis mechanism; Magnesium fluoride; ATPase inhibition; Transition state analog 1. Introduction ATP

Zulfiqar Ahmad

238

Critical Role of Magnesium Ions in DNA Polymerase 's Closing and Active Site Assembly  

E-Print Network (OSTI)

Critical Role of Magnesium Ions in DNA Polymerase 's Closing and Active Site Assembly Linjing Yang nucleotide with conserved catalytic residues (Asp190, Asp192, Asp256) and the two functional magnesium ions adjustments of the nucleotide-binding and catalytic magnesium ions help guide polymerase selection

Schlick, Tamar

239

Effect of microflora and lactose on the absorption of calcium, phosphorus and magnesium  

E-Print Network (OSTI)

Effect of microflora and lactose on the absorption of calcium, phosphorus and magnesium, magnesium and phosphorus was determined in the ileum, caecum, large intestine and faeces by the mineral/Tio2 and magnesium but did have an unfavorable influence on phosphorus absorption. Lactose increased calcium

Paris-Sud XI, Université de

240

PHYSICAL REVIEW B 84, 084101 (2011) Guiding the experimental discovery of magnesium alloys  

E-Print Network (OSTI)

PHYSICAL REVIEW B 84, 084101 (2011) Guiding the experimental discovery of magnesium alloys Richard 2011; published 19 August 2011) Magnesium alloys are among the lightest structural materials known and are of considerable technological interest. To develop superior magnesium alloys, experimentalists must have

Hart, Gus

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

The influence of magnesium deficiency on calcium metabolism P. LARVOR Marie-Louise LABAT  

E-Print Network (OSTI)

The influence of magnesium deficiency on calcium metabolism in the rat P. LARVOR Marie-Louise LABAT in magnesium-deficient rats with an isotopic technique. 45Ca was injected intravenously and the blood calcium. No important change was noticed after a 10-day magnesium deficiency ; there was a significant reduction

Boyer, Edmond

242

Abstract The hammerhead ribozyme, a small catalytic RNA molecule, cleaves, in the presence of magnesium  

E-Print Network (OSTI)

of magnesium ions, a specific phosphodiester bond within its own back- bone, leading to 23-cyclic phosphate ribozyme, obtained after flash-freezing crystals soaked with magnesium. Because of a careful equilibra AMBER · Ewald summation · Sheared GA pair · Magnesium ions · Ribose pucker flip Introduction

Westhof, Eric

243

Hot cracking in tungsten inert gas welding of magnesium alloy AZ91D  

E-Print Network (OSTI)

Hot cracking in tungsten inert gas welding of magnesium alloy AZ91D W. Zhou*, T. Z. Long and C. K ductility, and the HAZ was found to be the `weakest link'. Keywords: Magnesium alloy, AZ91D, TIG welding, Hot cracking, Liquation, Fracture Introduction Magnesium alloys have high strength/weight ratio

Zhou, Wei

244

Aufbau eines Frequenz-vervierfachten Diodenlasers fr die Photoionisation von Magnesium  

E-Print Network (OSTI)

Aufbau eines Frequenz-vervierfachten Diodenlasers für die Photoionisation von Magnesium this work, the construction and implementation of a laser-system for photo- ionization of magnesium is described. Finally, spectroscopic measurements of dierent magnesium isotopes are discussed with particular

Blatt, Rainer

245

Enthalpies of formation of magnesium compounds from first-principles calculations  

E-Print Network (OSTI)

Enthalpies of formation of magnesium compounds from first-principles calculations Hui Zhang t An energetics database of binary magnesium compounds has been developed from first-principles calculations. Introduction Magnesium alloys are of great importance to the industrial world. With a density of 1.741 g/cm3

Chen, Long-Qing

246

THE RAMAN SPECTRUM OF MAGNESIUM FLUORIDE By R. S. KRISHNAN and R. S. KATIYAR,  

E-Print Network (OSTI)

627. THE RAMAN SPECTRUM OF MAGNESIUM FLUORIDE By R. S. KRISHNAN and R. S. KATIYAR, Department, NOVEMBRE 1965, I Magnesium fluoride, which occurs in nature as the mineral sellaite, crystallizes spectrum of magnesium fluoride (MgF2) taken with a medium Quartz spectrograph. (b) Its microphotometer

Paris-Sud XI, Université de

247

Magnesium Ions Enhance the Transfer of Human Papillomavirus E2 Protein from Non-specific to  

E-Print Network (OSTI)

Magnesium Ions Enhance the Transfer of Human Papillomavirus E2 Protein from Non reactions which contain an excess of non-speci®c DNA, magnesium ions enhance the binding of E2 to its speci®c sites. In contrast, in the absence of non-speci®c DNA, magnesium ions have no effect on the binding of E

Gaston, Kevin

248

MODELING THE MEAN INTERACTION FORCES BETWEEN POWDER APPLICATION TO SILICA GEL-MAGNESIUM STEARATE MIXTURES.  

E-Print Network (OSTI)

1 MODELING THE MEAN INTERACTION FORCES BETWEEN POWDER PARTICLES. APPLICATION TO SILICA GEL-MAGNESIUM) particles (d50 = 55 µm) were coated with fine invited particles of magnesium stearate (MS, d50 = 4.6 µm. Interaction forces between the material attached to the cantilever (Magnesium Stearate MS) and the surface

Paris-Sud XI, Université de

249

Magnesium Ion-dependent Activation of the RecA Protein Involves the C Terminus*  

E-Print Network (OSTI)

Magnesium Ion-dependent Activation of the RecA Protein Involves the C Terminus* Received with ATP. We provide evi- dence that the free magnesium ion is required to medi- ate a conformational at low magnesium ion concentrations. The RecA protein of Escherichia coli plays a central role

Cox, Michael M.

250

Solid-State 25Mg NMR of a Magnesium(II) Adensosine 5-Triphosphate Complex  

E-Print Network (OSTI)

Solid-State 25Mg NMR of a Magnesium(II) Adensosine 5-Triphosphate Complex Christopher V. Grant interacting with RNA, such as magnesium- (II) binding sites within ribozymes, has become a topic of intense such as magnesium(II). X-ray crystallography has been most useful at providing structural information about

Frydman, Lucio

251

Growth of magnesium oxide thin lms using single molecular precursors by metalorganic chemical vapor deposition  

E-Print Network (OSTI)

Growth of magnesium oxide thin ®lms using single molecular precursors by metal±organic chemical precursors; Silicon; Sapphire 1. Introduction Magnesium oxide (MgO) thin ®lms have attracted much attention MgO ®lms on Si(100) above 6508C by thermal CVD. Murayama and Shionoya [12] used magnesium 2

Boo, Jin-Hyo

252

The magnesium nutrition of cotton as influenced by sodium  

E-Print Network (OSTI)

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...

Thenabadu, Mervyn Wellesly

2012-06-07T23:59:59.000Z

253

Growth of manganese filled carbon nanofibers in the vapor phase  

Science Journals Connector (OSTI)

We report the vapor phase growth of partially filled graphitic fibers, 20-30 nm in diameter and up to a micron in length, during a manganese catalyzed carbon electric arc discharge. The fiber morphology resembles that of catalytic chemical vapor deposited carbon filaments but the inside hollow contains intermittent precipitates and continuous filling of Mn that at times occupy >50% of fiber lengths. Transmission electron microscopy and electron energy loss line spectra show that the fillings form as solid cores and may correspond to pure metal.

P. M. Ajayan; C. Colliex; J. M. Lambert; P. Bernier; L. Barbedette; M. Tence; O. Stephan

1994-03-14T23:59:59.000Z

254

Paramagnetic Relaxation in Dilute Potassium Ferricyanide  

Science Journals Connector (OSTI)

Paramagnetic relaxation times have been measured for the ground-state doublet of iron present as a dilute substitutional impurity in potassium cobalt cyanide. Measurements were carried out over the temperature range 1.25 to 4.5°K and over a range of Fe/Co concentrations 0.24 to 3.5 at.%. Two frequencies were used, 1.8 and 8.5 Gc/sec, to provide a direct test of the frequency variation of the relaxation time. The "fast-passage-recovery" technique was employed, and a description of the apparatus is included. At 0.24% the 1.8-Gc/sec times are found to be well fitted by a Raman rate 1T1=4.3×10-3 T9 sec-1 over the entire temperature range and over five decades of time. At 8.5 Gc/sec this rate is augmented by a direct rate 1T1=3.1 T. At 0.5% the X-band direct rate is the same, but the Raman rate appears slightly higher; and the L-band rates are substantially faster. All relaxation rates increase with further increases in concentration, but the effect is stronger at 1.8 Gc/sec, so that the rates at both frequencies become equal at 1.7%. Still higher concentrations give rise to behavior not describable by a simple relaxation rate.For low concentration, the theoretical fourth-power frequency dependence of the direct relaxation process is not verified directly because the low frequency rates are always dominated by the Raman process; however, the frequency dependence must be as at least the third power to be consistent with the data. Some attempts are made to interpret the concentration dependence in terms of cross relaxation between single ions and coupled pairs.

Andreas Rannestad and Peter E. Wagner

1963-09-01T23:59:59.000Z

255

Onset of Metallic Behavior in Magnesium Clusters Owen C. Thomas, Weijun Zheng, Shoujun Xu, and Kit H. Bowen, Jr.  

E-Print Network (OSTI)

Onset of Metallic Behavior in Magnesium Clusters Owen C. Thomas, Weijun Zheng, Shoujun Xu, and Kit-selected magnesium cluster anions, Mgn ÿ , over the size range, n 3­35. Their s-p band gaps were observed to close in the finite size re- gime for the case of magnesium. Magnesium is a particu- larly instructive case because

Simons, Jack

256

Molecular Mechanisms of Calcium and Magnesium Binding to Parvalbumin  

E-Print Network (OSTI)

between the coordinating residues of the EF-hand calcium binding loop of parvalbumin and the overallMolecular Mechanisms of Calcium and Magnesium Binding to Parvalbumin M. Susan Cates, Miguel L at EF loop position 12 results in a dramatically less tightly bound monodentate Ca2 coordination

Phillips, George N. Jr.

257

Hydrogenation of Magnesium Nickel Boride for Reversible Hydrogen Storage  

Science Journals Connector (OSTI)

Hydrogenation of Magnesium Nickel Boride for Reversible Hydrogen Storage ... Use of hydrogen for transportation applications requires materials that not only store hydrogen at high density but that can operate reversibly at temperatures and pressures below approximately 100 °C and 10 bar, respectively. ... This composition is based on assuming the following complete hydrogenation reaction:which stores 2.6 wt % hydrogen. ...

Wen Li; John J. Vajo; Robert W. Cumberland; Ping Liu; Son-Jong Hwang; Chul Kim; Robert C. Bowman, Jr.

2009-11-06T23:59:59.000Z

258

Slow-Neutron Scattering Cross-Sections of Magnesium  

Science Journals Connector (OSTI)

... of magnesium has been measured using the arrangement shown in Fig. 1, which selects neutrons in the energy-range 0*5-1,000 eV. The number of ... in the energy-range 0*5-1,000 eV. The number of neutrons ...

P. A. EGELSTAFF; R. JACKSON

1953-08-29T23:59:59.000Z

259

Potassium, Uranium, Thorium Radiogenic Heat Contribution To Heat Flow In  

Open Energy Info (EERE)

Potassium, Uranium, Thorium Radiogenic Heat Contribution To Heat Flow In Potassium, Uranium, Thorium Radiogenic Heat Contribution To Heat Flow In The Precambrian And Younger Silicic Rocks Of The Zuni And Florida Mountains, New Mexico (Usa) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Potassium, Uranium, Thorium Radiogenic Heat Contribution To Heat Flow In The Precambrian And Younger Silicic Rocks Of The Zuni And Florida Mountains, New Mexico (Usa) Details Activities (4) Areas (2) Regions (0) Abstract: High heat flow in the Zuni Mountains, New Mexico, U.S.A., has been explained by the possible presence of a buried felsic pluton. Alternately, high K, U, Th abundances have been proposed to account for part of the high heat flow. The mean radiogenic heat contribution for 60 samples of Precambrian core rocks is 7.23 μcal/gm-yr, which is slightly

260

Asymmetric deposition of manganese oxide in single walled carbon nanotube films as electrodes for flexible high frequency response electrochemical capacitors  

Science Journals Connector (OSTI)

Manganese oxide (MnO2) is a promising pseudocapacitive electrode material because of its high capacitance, abundant resource, low-cost, and environmental friendliness. However, its poor electrical and ionic conductivities and low stability hinder applications. Forming MnO2 nanocomposites with high surface area porous metal, carbon materials, or conducting polymers is a possible solution. In this work, we have developed a facile and scalable asymmetric in situ deposition method to incorporate MnO2 nanoparticles in conductive single walled carbon nanotube (SWCNT) films. The high porosity of vacuum filtrated SWCNT films accommodates pseudocapacitive MnO2 nanoparticles without sacrificing the mechanical flexibility and electrochemical stability of SWCNT films. We exposed one side of SWCNT films to acidic potassium permanganate (KMnO4) solution. The infiltrated \\{KMnO4\\} solution partially etches \\{SWCNTs\\} to create abundant mesopores, which ensure electrolyte ions efficiently access deposited MnO2. Meanwhile, the remaining SWCNT network serves as excellent current collectors. The electrochemical performance of the SWCNT–MnO2 composite electrodes depends on the porosity of SWCNT films, pH, and concentration of \\{KMnO4\\} solution, deposition temperature and time. Our optimized two-electrode electrochemical capacitor, with 1 M Na2SO4 in water as electrolyte, showed a superior performance with specific capacitance of 529.8 F g?1, energy density of 73.6 Wh kg?1, power density of 14.6 kW kg?1, excellent capacitance retention (99.9%) after 2000 charge and discharge cycles, and one of the highest reported frequency responses (knee frequency at 1318 Hz). The high performance flexible electrochemical capacitors have broad applications in portable electronics and electrical vehicles, especially when high frequency response is desired.

Jianmin Shen; Andong Liu; Yu Tu; Hong Wang; Rongrong Jiang; Jie Ouyang; Yuan Chen

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

E-Print Network 3.0 - activates atp-sensitive potassium Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

atp-sensitive potassium Search Powered by Explorit Topic List Advanced Search Sample search results for: activates atp-sensitive potassium Page: << < 1 2 3 4 5 > >> 1 ATP-sensitive...

262

Direct production of light olefins from syngas over potassium modified Fe–Mn catalyst  

Science Journals Connector (OSTI)

A series of potassium promoted Fe–Mn catalysts for light olefin synthesis from CO hydrogenation were prepared by the co-precipitation-calcination-impregnation method. The impact of potassium promoter on the te...

Jiang-Bing Li; Hong-Fang Ma; Hai-Tao Zhang…

2014-08-01T23:59:59.000Z

263

Magnon damping by magnon-phonon coupling in manganese perovskites  

SciTech Connect

Inelastic neutron scattering was used to systematically investigate the spin-wave excitations (magnons) in ferromagnetic manganese perovskites. In spite of the large differences in the Curie temperatures (T{sub C}'s) of different manganites, their low-temperature spin waves have very similar dispersions with the zone-boundary magnon softening and broadening that cannot be explained by the canonical double exchange mechanism. From the wave-vector dependence of the magnon lifetime effects and its correlation with the dispersions of the optical-phonon modes, we argue that a strong magnetoelastic (magnon-phonon) coupling is responsible for the observed low-temperature anomalous spin dynamical behavior of the manganites. (c) 2000 The American Physical Society.

Dai, Pengcheng [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)] [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States); Hwang, H. Y. [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)] [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States); Zhang, Jiandi [Department of Physics, Florida International University, University Park, Miami, Florida 33199 (United States)] [Department of Physics, Florida International University, University Park, Miami, Florida 33199 (United States); Fernandez-Baca, J. A. [Oak Ridge Natinal Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)] [Oak Ridge Natinal Laboratory, Oak Ridge, Tennessee 37831-6393 (United States); Cheong, S.-W. [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States) [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States); Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855 (United States); Kloc, C. [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)] [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States); Tomioka, Y. [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 8562, (Japan)] [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 8562, (Japan); Tokura, Y. [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 8562, (Japan) [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 8562, (Japan); Department of Applied Physics, University of Tokyo, Tokyo 113 8656, (Japan)

2000-04-01T23:59:59.000Z

264

Hydrothermal manganese plumes in the Mid-Atlantic Ridge rift valley  

Science Journals Connector (OSTI)

... Fracture Zone at 1G? in August 1984. Manganese was measured on board ship by flameless atomic absorption after preconcentration with oxine9 to give a detection limit of 0.05 nmol ...

G. Klinkhammer; P. Rona; M. Greaves; H. Elderfield

1985-04-25T23:59:59.000Z

265

Structural Basis for the Metal-Selective Activation of the Manganese Transport Regulator of Bacillus subtilis,  

E-Print Network (OSTI)

-containing cofactor is at the heart of the oxygen-evolving complex (2), and in mammals, a manganese, UniVersity of Texas M. D. Anderson Cancer Center, Unit 1000, Houston, Texas 77030 ReceiVed NoVember 27

Lycan, Deborah E.

266

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

E-Print Network (OSTI)

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 ...

Noble, Abigail Emery

2012-01-01T23:59:59.000Z

267

Effect of manganese addition on hydrogen storage performance of vanadium-based BCC hydrogen storage alloys  

Science Journals Connector (OSTI)

The effect of manganese addition on hydrogen storage performance of vanadium-based BCC alloys was ... plateau pressure and a reverse effect on maximum hydrogen storage capacity. However, an effective hydrogen storage

Chan-Yeol Seo; Zhao-Liang Zhang; Jin-Ho Kim…

2002-07-01T23:59:59.000Z

268

On the Martensitic Transformation in f.c.c. Manganese Alloys. I. Measurements  

Science Journals Connector (OSTI)

...c. Manganese Alloys. I. Measurements R. D. Lowde R. T. Harley...cube axis directions. Phonon energy measurements, made to an accuracy of about...tenth of a reciprocal lattice unit of the origin. The anomalous...

1981-01-01T23:59:59.000Z

269

Spin-dependent electron transport in zinc- and manganese-doped adenine molecules  

SciTech Connect

The spin-dependent electron transport properties of zinc- and manganese-doped adenine molecules connected to zigzag graphene leads are studied in the zero bias regime using the non-equilibrium Green's function method. The conductance of the adenine molecule increased and became spin-dependent when a zinc or manganese atom was doped into the molecules. The effects of a transverse electric field on the spin-polarization of the transmitted electrons were investigated and the spin-polarization was controlled by changing the transverse electric field. Under the presence of a transverse electric field, both the zinc- and manganese-doped adenine molecules acted as spin-filters. The maximum spin-polarization of the manganese-doped adenine molecule was greater than the molecule doped with zinc.

Simchi, Hamidreza, E-mail: simchi@iust.ac.ir [Department of Physics, Iran University of Science and Technology, Narmak, Tehran 16844 (Iran, Islamic Republic of); Semiconductor Technology Center, Tehran 16844 (Iran, Islamic Republic of); Esmaeilzadeh, Mahdi, E-mail: mahdi@iust.ac.ir; Mazidabadi, Hossein [Department of Physics, Iran University of Science and Technology, Narmak, Tehran 16844 (Iran, Islamic Republic of)

2014-01-28T23:59:59.000Z

270

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

E-Print Network (OSTI)

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 ...

Soo, Haw Yun

2007-01-01T23:59:59.000Z

271

E-Print Network 3.0 - atp-sensitive potassium channels Sample...  

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channels Search Powered by Explorit Topic List Advanced Search Sample search results for: atp-sensitive potassium channels...

272

E-Print Network 3.0 - atp-sensitive potassium channel Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

channel Search Powered by Explorit Topic List Advanced Search Sample search results for: atp-sensitive potassium channel...

273

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate Fourth Quarterly Report 2006 Quarterly Progress of this work is to improve the process for CO2 capture by alkanolamine absorption/stripping by developing% in the order: thiosulfatecarbonate is ineffective in the absence of oxygen

Rochelle, Gary T.

274

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate Second Quarterly Report 2006 Quarterly Progress of this work is to improve the process for CO2 capture by alkanolamine absorption/stripping by developing for simultaneous removal of CO2 and SO2. Corrosion of carbon steel in uninhibited MEA solution is increased

Rochelle, Gary T.

275

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate First Quarterly Report 2007 Quarterly Progress of this work is to improve the process for CO2 capture by alkanolamine absorption/stripping by developing% to 160% in the order: thiosulfatecarbonate is ineffective

Rochelle, Gary T.

276

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

CO2 Capture by Absorption with Potassium Carbonate Third Quarterly Report 2006 Quarterly Progress of this work is to improve the process for CO2 capture by alkanolamine absorption/stripping by developing by Jou and Mather. Corrosion of carbon steel without inhibitors increases from 19 to 181 mpy in lean

Rochelle, Gary T.

277

Short Communication Catalytic coal gasification: use of calcium versus potassium*  

E-Print Network (OSTI)

Short Communication Catalytic coal gasification: use of calcium versus potassium* Ljubisa R on the gasification in air and 3.1 kPa steam of North Dakota lignitic chars prepared under slow and rapid pyrolysis of calcium is related to its sintering via crystallite growth. (Keywords: coal; gasification; catalysis

278

Mitochondrial potassium transport: the K+ Keith D. Garlid*, Petr Paucek  

E-Print Network (OSTI)

; Ion channel gating; Membrane transport; Volume regulation 1. Introduction The inner membrane. This means that ion traffic across the inner membrane will be very high. Moreover, the gradients driving saltReview Mitochondrial potassium transport: the K+ cycle Keith D. Garlid*, Petr Paucek Department

Garlid, Keith

279

Geochemistry of Magnesium Silicate Carbonation in an Aqueous Medium  

NLE Websites -- All DOE Office Websites (Extended Search)

Geochemistry of Magnesium Silicate Geochemistry of Magnesium Silicate Carbonation in an Aqueous Medium (Carbon Mineralization) Jon Benner, Deb Bergfeld, Dave Bish, Darrin Byler, Bill Carey, Steve Chipera, George Guthrie, Klaus Lackner, Hans Ziock Hydrology, Geochemistry, Geology Group Los Alamos National Laboratory LA-UR-01-4206 Approved for public release; distribution is unlimited George Guthrie gguthrie@lanl.gov 505-665-6340 Mineral Carbonation: Conversion of CO 2 into Carbonates * alkali carbonates too soluble * alkaline earth carbonates ideal sources: Ca-silicates (feldspar) Mg-silicates (olivine, serpentine, clays) Mg 2+ + CO 3 2- => MgCO 3 Mg 2 SiO 4 + 4H + => 2Mg 2+ + SiO 2(aq) Ultramafic rocks are an abundant Mg source (~0.2 km) 3 serpentine / GW-yr Challenges for Mineral-Carbonation

280

Oxidation of magnesium single crystals and evaporated films  

Science Journals Connector (OSTI)

The oxidation of (001) and (100) faces of pure magnesium single crystals at 2.5 mm Hg oxygen pressure was measured at 400°C and 440°C by means of an all-quartz, high vacuum microbalance. In a first approximation a parabolic oxidation law is observed. The oxidation rate on the basal plane is initially higher than on the prismatic plane. Electron diffraction patterns and photomicrographs indicate that the oxide has a preferred orientation on the basal plane, even for a thickness of about 1000 Å. The oxidation of evaporated magnesium films at room temperature was also investigated. After an induction period a logarithmic oxidation law is observed, where the limiting thickness is dependent on the oxygen pressure.

R.R Addiss Jr.

1963-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Fretting wear of coated magnesium and steel couples  

Science Journals Connector (OSTI)

An experimental procedure is undertaken to establish the effect of design parameters upon the severity of fretting wear caused by steel (AMS 6265) rubbing on magnesium (AMS 4439), and to determine the ability of selected coatings to delay wear induced failure. The procedure consists of two major tasks as follows: The design, construction and operation of a suitable fretting wear machine, and an experimental set-up to systematically evaluate the relevant wear controlling parameters and surface treatment. Several wear tests were performed under different operating and surface conditions, and the results are presented in some detail. It was found that magnaplated coated magnesium samples offer the best wear resistance as compared to Xylan coated and plain samples. Slip amplitude was found to be the most dominant parameter that contributed mainly to fretting wear as compared to other wear parameters such as frequency of oscillation, test duration, and contact load.

A.H. Elkholy

1996-01-01T23:59:59.000Z

282

Forming of Magnesium - Crystal Plasticity and Plastic Potentials  

SciTech Connect

Hexagonal close-packed (hcp) metals show a deformation behavior, which is quite different from that of materials with cubic crystalline structure. As a consequence, rolled or extruded products of magnesium and its alloys exhibit a strong anisotropy and an unlike yielding in tension and compression. Microstructural mechanisms of deformation in pure magnesium are modeled by constitutive equations of crystal plasticity. Single crystals and textured polycrystals are analyzed numerically. By means of virtual mechanical tests of representative volume elements mesoscopic yield surfaces are generated and compared with phenomenological yield surfaces. The hardening behavior as well as deformation kinematics are accounted while fitting the respective model parameters for a plane stress state. The linking of micro- and mesoscale provides a procedure for the simulation of the yielding and hardening behavior of arbitrarily textured solids with hcp structure such as extruded bars or rolled plates.

Steglich, Dirk; Graff, Stephane; Brocks, Wolfgang [GKSS Research Center, Institute for Materials Research, Mechanics of Materials, Geesthacht (Germany)

2007-04-07T23:59:59.000Z

283

Performance of Magnesium Cathode in the S Band RF Gun  

SciTech Connect

In this paper, we present the preliminary results of the performance of magnesium cathode in a high frequency RF gun. The quantum efficiency of magnesium showed a dramatic improvement upon laser cleaning, increasing from 10{sup -5} to 4x10{sup -4} after two hours of cleaning. The spatial uniformity of emission also improved from a spot to spot variation of 10 to a variation of 2. Measurements with charges >1 nC indicate that the transient variation of the field due to the shielding effect of the electron in the vicinity of the cathode may play a critical role in the efficient extraction of electrons. Comprehensive theory that includes the electron emission in the presence of a time dependent Schottky effect and RF effects will be discussed.

Srinivasan-Rao, T.; /Brookhaven; Palmer, D.T.; /SLAC; Ben-Zvi, I.; /Brookhaven; Miller, R.H.; /SLAC; Wang, X.J.; Woodle, M.; /Brookhaven

2011-09-01T23:59:59.000Z

284

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

SciTech Connect

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.

Adam C. Powell, IV

2012-07-19T23:59:59.000Z

285

Study of Forming of Magnesium Alloy by Explosive Energy  

SciTech Connect

Magnesium alloy is an attractive next generation material due to its high specific strength with low weight. However, magnesium alloys has few slip lines with close-packed hexagonal lattice, and generally poor ductility at room temperature, therefore it is difficult to form this material by cold forging. It is well known that the speed of deformation of metallic materials rapidly changes at the high strain rate. For some metallic materials, it is reported that the ductility also increases at the high strain rate with this speed effect. In this study, a series of high speed impulsive compressive tests were carried. By using explosives for shock wave loading, the velocity in this experiment reached 100 m/s that can't be easily obtained in normal experiment. In this paper, the possibility of forming the AZ31 extrusion magnesium alloy using explosive-impulsive pressure is investigated. And improved ductility by the effect of high-rate deformation is observed with this alloy.

Ruan, Liqun; Hokamoto, Kazuyuki; Marumo, Yasuo [Kumamoto University Department of Mechanical Systems Engineering Graduate School of Science and Technology, Kurokami 2-39-1, Kumamoto-shi 860-8555 (Japan); Yahiro, Ititoku [Mitsui Engineering and Shipbuilding Co., Ltd. Nihonbasi 1-3-16, Toukyou 104-8439 (Japan)

2011-05-04T23:59:59.000Z

286

Aqueous Corrosion Behavior of Micro Arc Oxidation (MAO)-Coated Magnesium Alloys: A Critical Review  

Science Journals Connector (OSTI)

Magnesium (Mg) and its alloys, in the current era of persistently growing engineering demands, have become the most promising materials finding widespread industrial applications. Numerous processes are available...

L. Rama Krishna; G. Sundararajan

2014-06-01T23:59:59.000Z

287

E-Print Network 3.0 - aluminium magnesium alloy Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

36 per cent Summary: and Anwar Parvez analyse the importance of Magnesium-Aluminium- Strontium alloys for more fuel... can be achieved through replacing aluminium and some steel...

288

Double-Sided Arc Welding of AZ31B Magnesium Alloy Sheet.  

E-Print Network (OSTI)

??Magnesium alloys are of interest to the automotive industry because of their high specific strength and potential to reduce vehicle weight and fuel consumption. In… (more)

Shuck, Gerald

2013-01-01T23:59:59.000Z

289

Fatigue Characterization and Cyclic Plasticity Modeling of Magnesium Spot-Welds.  

E-Print Network (OSTI)

??The automotive industry is adopting lightweight materials to improve emissions and fuel economy. Magnesium (Mg) alloys are the lightest of engineering metals, but work is… (more)

Behravesh, Seyed Behzad

2013-01-01T23:59:59.000Z

290

Ductility and chemical reactions at the interface between nickel and magnesium oxide single crystals.  

E-Print Network (OSTI)

??An investigation was conducted on the interaction between nickel metal and single crystals of magnesium oxide. The nickel was cleaned with purified hydrogen gas at… (more)

Hasselman, Didericus Petrus Hermannus

2011-01-01T23:59:59.000Z

291

Minerals to dairy cows with focus on calcium and magnesium balance.  

E-Print Network (OSTI)

??Both clinical and subclinical deficiency of calcium and magnesium may cause problems in dairy cows. Clinical hypocalcaemia most commonly occurs at calving and onset of… (more)

Kronqvist, Cecilia

2011-01-01T23:59:59.000Z

292

Numerical Modeling of Failure in Magnesium Alloys under Axial Compression and Bending for Crashworthiness Applications.  

E-Print Network (OSTI)

??Numerical modeling of failure was performed for magnesium alloys with circular and square cross-sections under axial compression. The failure criterion was employed using material model… (more)

Ali, Usman

2012-01-01T23:59:59.000Z

293

Investigation of a novel passivation technique for gas atomized magnesium powders.  

E-Print Network (OSTI)

??Gas atomized magnesium powders are critical for the production of a wide variety of flares, tracer projectiles, and other munitions for the United States military,… (more)

Steinmetz, Andrew Douglas

2011-01-01T23:59:59.000Z

294

E-Print Network 3.0 - az magnesium alloys Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Engineering, University of Iowa Collection: Materials Science 17 The Effect of Rare Earth Elements, Temperature and Rolling Speed on the Microstructure Evolution of Magnesium...

295

Adsorption and decomposition of triclosan by activated carbons, manganese oxides, and their composite materials from aqueous solution.  

E-Print Network (OSTI)

??This research investigates the use of activated carbon (AC) and manganese oxides as adsorbents and oxidizing agents to adsorb and oxidize triclosan, a compound which… (more)

Fang, Sheng

2010-01-01T23:59:59.000Z

296

Production and field performance of transgenic alfalfa (Medicago sativa L.) expressing alpha-amylase and manganese-dependent lignin peroxidase  

Science Journals Connector (OSTI)

Transgenic alfalfa plants expressing Bacillus licheniformis alpha-amylase and manganese-dependent lignin peroxidase (Mn-P...Phanerochaete chrysosporium were produced using the Agrobacterium tumefaciens...transfor...

S. Austin; E. T. Bingham; D. E. Mathews…

1995-01-01T23:59:59.000Z

297

Muon Spin Relaxation Study of Spinel Lithium Manganese Oxides  

Science Journals Connector (OSTI)

Muons can be implanted into any material, and the direction of the muon spin at the instant of decay (?+ ? e+ + ?e + ???, lifetime = 2.179 ?s) provides information on the dynamics of the muon during its lifetime and on the static and fluctuating magnetic fields from neighboring nuclear and atomic moments. ... On the other hand, the shape of the H+-MnO2 spectrum at 100 K shows two Gaussian components, which indicates the existence of at least two different depolarization rates that can be due to muons at two different muon sites. ... Therefore, these results indicate that the temperature for onset of Li+ ion diffusion decreases with an increase in the amount of lithium in the spinel manganese oxide, which is not incompatible with a higher Li+ diffusion coefficient on LiMn2O4 than on Li1.33Mn1.67O4 found from NMR experiments,21 since NMR data will average over all Li nuclei whereas muons only interact with those Li nearest to the muon. ...

María J. Ariza; Deborah J. Jones; Jacques Rozière; James S. Lord; Didier Ravot

2003-05-28T23:59:59.000Z

298

Trans-stereospecific polymerization of butadiene and random copolymerization with styrene using borohydrido neodymium / magnesium dialkyl catalysts  

E-Print Network (OSTI)

borohydrido neodymium / magnesium dialkyl catalysts A. Venturaa , T. Chenalb,c,d,e, *, M. Briab,f , F. Bonnetb neodymium and magnesium, and significant amounts of 1,2-units are observed. When considered for butadiene

Boyer, Edmond

299

In Situ Measurement of Magnesium Carbonate Formation from CO2 Using Static High-Pressure and -Temperature 13  

E-Print Network (OSTI)

In Situ Measurement of Magnesium Carbonate Formation from CO2 Using Static High the reaction of CO2 with water. Many studies6,8-10 have focused on the carbonation of the magnesium-contai

Skemer, Philip

300

A. Bag, W. Zhou, D. Taplin and E. S. Dwarakadasa, Fatigue Behaviour of AZ91D Magnesium Alloy and its Composite Reinforced with SiC, in Magnesium Technology 2000, eds. H. I. Kaplan, J. N. Hryn  

E-Print Network (OSTI)

A. Bag, W. Zhou, D. Taplin and E. S. Dwarakadasa, Fatigue Behaviour of AZ91D Magnesium Alloy and its Composite Reinforced with SiC, in Magnesium Technology 2000, eds. H. I. Kaplan, J. N. Hryn and B. B. Clow, Nashville, Tennessee, Mar. 2000, pp. 345-348. FATIGUE BEHAVIOUR OF AZ91D MAGNESIUM ALLOY

Zhou, Wei

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Time evolution of colliding laser produced magnesium plasmas investigated using a pinhole camera  

E-Print Network (OSTI)

suitable conditions for x-ray amplification in a laser produced plasma.24 When two plasmas collide, variTime evolution of colliding laser produced magnesium plasmas investigated using a pinhole camera S for publication 14 February 2001 Time resolved studies of colliding laser produced magnesium plasmas are performed

Harilal, S. S.

302

Three-photon above-threshold ionization of magnesium F. Martin,2  

E-Print Network (OSTI)

Three-photon above-threshold ionization of magnesium A. Reber,1 F. Marti´n,2 H. Bachau,3 and R. S of magnesium as an electron source 1 have motivated our theoretical study in three-photon above

Berry, R. Stephen

303

Two-photon above-threshold ionization of magnesium F. Martin,2  

E-Print Network (OSTI)

Two-photon above-threshold ionization of magnesium A. Reber,1 F. Marti´n,2 H. Bachau,3 and R. S to understanding the photoionization properties of magnesium 1­8 , the problem of above- threshold ionization ATI

Berry, R. Stephen

304

Modelling of Superplastic Forming of AZ31 Magnesium Alloy  

SciTech Connect

In this study the constitutive equation of the superplastic AZ31 magnesium-based alloy is modelled by the power law relationship between the stress, the strain and the strain-rate and an accurate procedure for determining the constants of the material is presented. Moreover, the problem of optimizing the pressure-time load curve of a free forming process is investigated and resolved by means of a pressure jump forming process. The experimental tests, carried out to support the finite-element modelling, have shown good agreement between the numerical results and the experimental data.

Giuliano, G. [University of Cassino, Department of Industrial Engineering, via Di Biasio 43, 03043 Cassino (Italy)

2011-01-17T23:59:59.000Z

305

An investigation of magnesium production in silicon by neutron transmutation  

E-Print Network (OSTI)

the reactor. Thus, the f'lux at a lower power is, to a good approximation decreased from that deter mined at 1 MWt by the ratio of the reactor power to a power of' 1 MWt. Determination of the alpha current incident on the track detector film depends... Science Center Reactor (NSCR), (2) exper i mental determination of the production r ate of magnesium in silicon using a solid state nuclear track detector (SSNTD) to measur e alpha emission, and (3) comparison oi' the exper imental r esults...

Davis, Freddie Joe

2012-06-07T23:59:59.000Z

306

CIRP Conference on Modeling of Machining Operations (CIRP CMMO) Constitutive Modelling of AZ31B-O Magnesium Alloy  

E-Print Network (OSTI)

B-O Magnesium Alloy for Cryogenic Machining E. Girauda* , F. Rossib , G. Germaina , J.C. Outeirob disks of AZ31B-O magnesium alloy, using a special designed tool. In order to include the effects of Machining Operations" in the person of the Conference Chair Prof. Luca Settineri Keywords: Magnesium alloy

Paris-Sud XI, Université de

307

The Role of Magnesium for Geometry and Charge in GTP Hydrolysis, Revealed by Quantum Mechanics/Molecular Mechanics Simulations  

E-Print Network (OSTI)

The Role of Magnesium for Geometry and Charge in GTP Hydrolysis, Revealed by Quantum Mechanics, People's Republic of China ABSTRACT The coordination of the magnesium ion in proteins by triphosphates conversion. For example, in Ras the magnesium ion contributes to the catalysis of GTP hydrolysis

Gerwert, Klaus

308

A Late Neoproterozoic (V630 Ma) high-magnesium andesite suite from southern Israel: implications for the consolidation  

E-Print Network (OSTI)

A Late Neoproterozoic (V630 Ma) high-magnesium andesite suite from southern Israel: implications and depleted in heavy rare earth elements. They are high-magnesium andesites and are similar to low-Ca type 2; Neoproterozoic; high-magnesium andesite 1. Introduction The Arabian^Nubian Shield (ANS) comprises 0012-821X / 03

Basu, Asish R.

309

Magnesium aluminate (MgAl2O4) spinel produced via self-heat-sustained (SHS) technique  

E-Print Network (OSTI)

Magnesium aluminate (MgAl2O4) spinel produced via self-heat-sustained (SHS) technique Lim Rooi of the reactants to produce very high phase-purity magnesium aluminate powder under rather mild experi- mental effect of slightly off-stoichiometry ( 9 wt. %) in composi- tions on either side of magnesium aluminate

Azad, Abdul-Majeed

310

AM1/d Parameters for Magnesium in Metalloenzymes Petra Imhof, Frank Noe, Stefan Fischer, and Jeremy C. Smith*,  

E-Print Network (OSTI)

AM1/d Parameters for Magnesium in Metalloenzymes Petra Imhof, Frank Noe´, Stefan Fischer parameters are derived for magnesium, optimized for modeling reactions in metalloenzymes. The parameters calculated with density functional theory. The training set consists of compounds with magnesium coordinated

311

A Comparison of Magnesium and Beryllium Acceptors in GaN Grown by rf-Plasma Assisted Molecular Beam Epitaxy  

E-Print Network (OSTI)

A Comparison of Magnesium and Beryllium Acceptors in GaN Grown by rf-Plasma Assisted Molecular Beam Evans and Associates, Sunnyvale, CA 94086 ABSTRACT Step-doped structures of both magnesium and beryllium activation energy of approximately 100 meV. INTRODUCTION While magnesium is currently the most

Myers, Tom

312

Changes in histamine and white blood cells in the blood, spleen and thymus of magnesium-deficient rat  

E-Print Network (OSTI)

Changes in histamine and white blood cells in the blood, spleen and thymus of magnesium of rats were given either a control or a magnesium-deficient diet. The well-known allergy-like crisis, characterized by vasodilatation with redness of the ears and dermatosis, occurred spontaneously in the magnesium

Paris-Sud XI, Université de

313

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

DOE Patents (OSTI)

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.

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

314

Hydrothermal Synthesis of Pure r-Phase Manganese(II) Sulfide without the Use of Organic Reagents  

E-Print Network (OSTI)

Articles Hydrothermal Synthesis of Pure r-Phase Manganese(II) Sulfide without the Use of Organic for finding carbon-free synthesis methods for metal sulfides. The decomposition of organosulfur, such as manganese sulfide (MnS). Here we report a hydrothermal synthesis method for the formation of MnS in which

315

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

E-Print Network (OSTI)

Research, University of Delaware, Newark, DE 19716, United States, (2) Engineer Research & Development Center, U.S. Army Corps of Engineers, Vicksburg, MS 39180, United States Manganese(IV) oxides are one of the main redox catalysts in the subsurface environment. Their highly reactive surfaces allow manganese (Mn

Sparks, Donald L.

316

Hyperoxaluria after modern bariatric surgery: case series and literature review  

E-Print Network (OSTI)

Magnesium Oxalate pH Phosphorous Potassium Sodium Sulfateuric acid, creatinine, phosphorous, sodium, potassium, andCreatinine Magnesium Oxalate Phosphorous Table 3 Mean 24-h

Whitson, Jared M.; Stackhouse, G. Bennett; Stoller, Marshall L.

2010-01-01T23:59:59.000Z

317

In situ synthesis of magnesium-substituted biphasic calcium phosphate and in vitro biodegradation  

SciTech Connect

Highlights: ? Mg–BCP were successfully prepared through in situ aqueous co-precipitation method. ? The amount of ?-TCP phase was changed with the magnesium substitution level. ? The substitution of magnesium led to a decrease in the unit cell volume. ? Mg–BCP could be able to develop a new apatite phase on the surface faster than BCP. -- Abstract: In situ preparation of magnesium (Mg) substituted biphasic calcium phosphate (BCP) of hydroxyapatite (HAp)/?-tricalcium phosphate (?-TCP) were carried out through aqueous co-precipitation method. The concentrations of added magnesium were varied with the calcium in order to obtain constant (Ca + Mg)/P ratios of 1.602. X-ray diffraction (XRD) and Fourier transformed infrared (FTIR) spectroscopy were used to characterize the structure of synthesized magnesium substituted BCP powders. The results have shown that substitution of magnesium in the calcium deficient apatites revealed the formation of biphasic mixtures of different HAp/?-TCP ratios after heating at 1000 °C. The ratios of the formation of phase mixtures were dependent on the content of magnesium. After immersing in Hanks’ balanced salt solution (HBSS) for 1 week, 1 wt% magnesium substituted BCP powders were degraded and precipitation started to be formed with small granules consisting of number of flake-like crystal onto the surface of synthesized powders. On the other hand, in the case of pure BCP powders, the formation of new precipitates was detected after immersion in HBSS for 2 weeks. On the basis of these results, magnesium substituted BCP could be able to develop a new apatite phase on the surface in contact with physiological fluids faster than BCP does. In addition, the retention time to produce the new apatite phase in implantation operation for the BCP powder could be controlled by the amount of magnesium substitution.

Kim, Tae-Wan; Lee, Hyeong-Shin; Kim, Dong-Hyun; Jin, Hyeong-Ho [School of Materials Science and Engineering, Pusan National University, Busan 609-735 (Korea, Republic of)] [School of Materials Science and Engineering, Pusan National University, Busan 609-735 (Korea, Republic of); Hwang, Kyu-Hong [School of Nano and Advanced Materials, Gyeongsang National University, Jinju, Kyungnam 660-701 (Korea, Republic of)] [School of Nano and Advanced Materials, Gyeongsang National University, Jinju, Kyungnam 660-701 (Korea, Republic of); Lee, Jong Kook [Department of Advanced Materials Engineering, Chosun University, Gwangju 501-759 (Korea, Republic of)] [Department of Advanced Materials Engineering, Chosun University, Gwangju 501-759 (Korea, Republic of); Park, Hong-Chae [School of Materials Science and Engineering, Pusan National University, Busan 609-735 (Korea, Republic of)] [School of Materials Science and Engineering, Pusan National University, Busan 609-735 (Korea, Republic of); Yoon, Seog-Young, E-mail: syy3@pusan.ac.kr [School of Materials Science and Engineering, Pusan National University, Busan 609-735 (Korea, Republic of)] [School of Materials Science and Engineering, Pusan National University, Busan 609-735 (Korea, Republic of)

2012-09-15T23:59:59.000Z

318

SUITABILITY OF MAGNESIUM OXIDE AS A VISAR WINDOW  

SciTech Connect

Impedance matching of a velocity interferometer for any reflector (VISAR) window to a material under study helps simplify a shock experiment by effectively allowing one to measure an in situ particle velocity. The shock impedance of magnesium oxide (MgO) falls roughly midway between those of sapphire and LiF, two of the most frequently used VISAR window materials. A series of symmetric impact experiments was performed to characterize the suitability of single crystal, (100) oriented magnesium oxide as a VISAR window material. These experiments yielded good results and show the viability of MgO as a VISAR window up to 23 GPa. Results were used to determine window correction factors and, subsequently, to estimate the pressure induced change in index of refraction. In many of the shots in this work we exceeded the Hugoniot elastic limit (HEL) of MgO, and both elastic and plastic waves are evident in the velocity profiles. The presence of both waves within the VISAR window complicates the typical VISAR window correction analysis. Preliminary analysis of the elastic and plastic contributions to the window correction is presented.

G. D. Stevens; L. R. Veeser; P. A. Rigg; R. S. Hixson

2005-01-01T23:59:59.000Z

319

Investigation of Deformation Dynamics in a Wrought Magnesium Alloy  

SciTech Connect

In the present research, the deformation dynamics and the effect of the deformation history on plastic deformation in a wrought magnesium alloy have been studied using real-time in-situ neutron diffraction measurements under a continuous loading condition and elastic-viscoplastic self-consistent (EVPSC) polycrystal modeling. The experimental results reveal that the pre-deformation delayed the activation of the tensile twinning during subsequent compression, mainly resulting from the residual strain. No apparent detwinning occurred during unloading and even in the elastic region during reverse loading. It is believed that the grain rotation played an important role in the elastic region during reverse loading. The EVPSC model, which has been recently updated by implementing the twinning and detwinning model, was employed to characterize the deformation mechanism during the strain-path changes. The simulation result predicts well the experimental observation from the real-time in-situ neutron diffraction measurements. The present study provides a deep insight of the nature of deformation mechanisms in a hexagonal close-packed structured polycrystalline wrought magnesium alloy, which might lead to a new era of deformation-mechanism research.

Wu, Wei [ORNL; Qiao, Hua [McMaster University; An, Ke [ORNL; Wu, Peidong [McMaster University; Liaw, Peter K [University of Tennessee, Knoxville (UTK)

2014-01-01T23:59:59.000Z

320

The Variation of Magnesium Depletion with Line of Sight Conditions  

E-Print Network (OSTI)

In this paper we report on the gas-phase abundance of singly-ionized magnesium (Mg II) in 44 lines of sight, using data from the Hubble Space Telescope (HST). We measure Mg II column densities by analyzing medium- and high-resolution archival STIS spectra of the 1240 A doublet of Mg II. We find that Mg II depletion is correlated with many line of sight parameters (e.g. F(H_2), E_(B-V), E_(B-V)/r, A_V, and A_V/r) in addition to the well-known correlation with . These parameters should be more directly related to dust content and thus have more physical significance with regard to the depletion of elements such as magnesium. We examine the significance of these additional correlations as compared to the known correlation between Mg II depletion and . While none of the correlations are better predictors of Mg II depletion than , some are statistically significant even assuming fixed . We discuss the ranges over which these correlations are valid, their strength at fixed , and physical interpretations.

Adam G. Jensen; Theodore P. Snow

2007-10-04T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

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

E-Print Network (OSTI)

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...

McCrary, Leon Eldon

1960-01-01T23:59:59.000Z

322

Manganese oxide helices, rings, strands, and films, and methods for their preparation  

DOE Patents (OSTI)

Methods for the preparation of mixed-valence manganese oxide compositions with quaternary ammonium ions are described. The compositions self-assemble into helices, rings, and strands without any imposed concentration gradient. These helices, rings, and strands, as well as films having the same composition, undergo rapid ion exchange to replace the quaternary ammonium ions with various metal ions. And the metal-ion-containing manganese oxide compositions so formed can be heat treated to form semi-conducting materials with high surface areas.

Suib, Steven L. (Storrs, CT); Giraldo, Oscar (Storrs, CT); Marquez, Manuel (Wheeling, IL); Brock, Stephanie (Detroit, MI)

2003-01-07T23:59:59.000Z

323

ReaxFFMgH Reactive Force Field for Magnesium Hydride Systems Sam Cheung, Wei-Qiao Deng, Adri C. T. van Duin, and William A. Goddard III*  

E-Print Network (OSTI)

ReaxFFMgH Reactive Force Field for Magnesium Hydride Systems Sam Cheung, Wei-Qiao Deng, Adri C. TFFMgH) for magnesium and magnesium hydride systems. The parameters for this force field were derived from fitting to quantum chemical (QM) data on magnesium clusters and on the equations of states for condensed phases

van Duin, Adri

324

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

E-Print Network (OSTI)

91D magnesium alloy R. AMBAT, N.N. AUNG and W. ZHOU School of Mechanical and Production Engineering in revised form 20 January 2000 Key words: AZ91D alloy, chloride ion, corrosion, die-cast, ingot, magnesium of morphology. The corrosion product consisted of magnesium hydroxide, fallen b particles and magnesium

Zhou, Wei

325

E-Print Network 3.0 - atp-dependent potassium channels Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

andrecovery. Recently, ATP-dependent potassium channels havebeen identified by direct patch... and Partial Purification of the Glibenclamide-sensitive, ATP-dependent K' Channel...

326

Potassium Fixation and Supply by Soils with Mixed Clay Minerals.  

E-Print Network (OSTI)

supplied onl!. Studies were made on three agriculturally important me/me of exchangeable K. The capacity of all a soils of South Texas and Northern Mexico to determine soils to fix K increased with increasing remo\\dl i their potassium (K)-supplying power...- T east and Southeast United States has been investigated. Little work has been done, however, on soils of the Southwest. Soils of the West and Southwest are generally quite high in K, and responses are not usually obtained from the addition of K...

Hipp, Billy W.

1969-01-01T23:59:59.000Z

327

High Pressure X-ray Diffraction Study of Potassium Azide  

SciTech Connect

Crystal structure and compressibility of potassium azide was investigated by in-situ synchrotron powder X-ray diffraction in a diamond anvil cell at room temperature up to 37.7 GPa. In the body-centered tetragonal (bct) phase, an anisotropic compressibility was observed with greater compressibility in the direction perpendicular to the plane containing N{sub 3}{sup -} ions than directions within that plane. The bulk modulus of the bct phase was determined to be 18.6(7) GPa. A pressure-induced phase transition may occur at 15.5 GPa.

C Ji; F Zhang; D Hong; H Zhu; J Wu; M Chyu; V Levitas; Y Ma

2011-12-31T23:59:59.000Z

328

Potassium sources and availability in three East Texas soils  

E-Print Network (OSTI)

Coefficient of determination values for selected parameters of Troup versus exchangeable po tas slum 63 16 Fstimated amount of mica potassium in s5um materials to a depth of 235cm 65 LIST OF FIGURES Figure Page Distribution of percent K 0 in Troup... with depth 34 Comparison of Na S 0 treated and untreated Troup 20-5um mater aI from 205-235cm depth 38 Distribution of Gapon selectivity coefficients in Troup with depth Distribution of Gapon selectivity coefficients in Boswell with depth 46 X...

Hons, F. M

2012-06-07T23:59:59.000Z

329

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

SciTech Connect

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.

STUBBS, A.M.

2001-06-25T23:59:59.000Z

330

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

331

Reverse Transcription-PCR Analysis of the Regulation of the Manganese Peroxidase Gene Family  

Science Journals Connector (OSTI)

...also contain putative heat shock elements...of polycyclic aromatic hydrocarbon-contaminated soil with...Alic M. Gold M. H. Heat shock induction of manganese...Farrell R. L. Enzymatic combustion: the microbial degradation...enzyme, as well as by heat shock and other factors...

Jessica M. Gettemy; Biao Ma; Margaret Alic; Michael H. Gold

1998-02-01T23:59:59.000Z

332

Carbon Nanotube/Manganese Oxide Ultrathin Film Electrodes for Electrochemical Capacitors  

Science Journals Connector (OSTI)

Multiwall carbon nanotube (MWNT)/manganese oxide (MnO2) nanocomposite ultrathin film electrodes have been created via redox deposition of MnO2 on layer-by-layer (LbL)-assembled MWNT films. We demonstrate that these LbL-assembled MWNT (LbL-MWNT)/MnO2 thin ...

Seung Woo Lee; Junhyung Kim; Shuo Chen; Paula T. Hammond; Yang Shao-Horn

2010-06-16T23:59:59.000Z

333

Parallel Polarization EPR Characterization of the Mn(III) Center of Oxidized Manganese Superoxide  

E-Print Network (OSTI)

Parallel Polarization EPR Characterization of the Mn(III) Center of Oxidized Manganese Superoxide polarization CW-EPR to investigate the paramagnetic Mn3+ ion of the MnSOD enzyme from Escherichia coli with a positive axial zero-field splitting value, D, are arranged as shown in Figure 1. An EPR signal from the Mn

Miller, Anne-Frances

334

Rare earth element sorption onto hydrous manganese oxide A modeling study  

E-Print Network (OSTI)

element sorption onto hydrous manganese oxide A modeling study Olivier Pourret1* and Mélanie Davranche2 1 models due to the lack of a comprehensive set of sorption reactions consistent with a given surface complexation model (SCM), as well as discrepancies between published sorption data and predictions using

Paris-Sud XI, Université de

335

X-ray Fluorescence Measurements of Manganese in Petroglyphs and Graffiti in the Bluff, Utah Area  

E-Print Network (OSTI)

X-ray Fluorescence Measurements of Manganese in Petroglyphs and Graffiti in the Bluff, Utah Area the age of rock art using Mn levels, Lytle (2008). In this work we use x-ray fluorescence (XRF) to measure of methods including atomic mass spectroscopy (AMS) measurements of 14 C, Particle-induced X-ray Excitation

336

Amperometric Biosensors Based on Carbon Paste Electrodes Modified with Nanostructured Mixed-valence Manganese Oxides and Glucose Oxidase  

SciTech Connect

Nanostructured multivalent manganese oxides octahedral molecular sieve (OMS), including cryptomelane-type manganese oxides and todorokite-type manganese oxides, were synthesized and evaluated for chemical sensing and biosensing at low operating potential. Both cryptomelane-type manganese oxides and todorokite-type manganese oxides are nanofibrous crystals with sub-nanometer open tunnels that provide a unique property for sensing applications. The electrochemical and electrocatalytic performance of OMS for the oxidation of H2O2 have been compared. Both cryptomelane-type manganese oxides and todorokite-type manganese oxides can be used to fabricate sensitive H2O2 sensors. Amperometric glucose biosensors are constructed by bulk modification of carbon paste electrodes (CPEs) with glucose oxidase as a biocomponent and nanostructured OMS as a mediator. A Nafion thin film was applied as an immobilization/encapsulation and protective layer. The biosensors were evaluated as an amperometric glucose detector at phosphate buffer solution with a pH 7.4 at an operating potential of 0.3 V (vs. Ag/AgCl). The biosensor is characterized by a well-reproducible amperometric response, linear signal-to-glucose concentration range up to 3.5 mM and 1.75 mM, and detection limits (S/N = 3) of 0.1 mM and 0.05 mM for todorokite-type manganese oxide and cryptomelane-type manganese oxide modified electrodes, respectively. The biosensors based on OMS exhibit considerable good reproducibility and stability, and the construction and renewal are simple and inexpensive.

Cui, Xiaoli; Liu, Guodong; Lin, Yuehe

2005-06-01T23:59:59.000Z

337

Climate VISION: Private Sector Initiatives: Magnesium: Resources and Links  

Office of Scientific and Technical Information (OSTI)

Software Tools Software Tools The magnesium industry intends to eliminate emissions of SF6 by evaluating and adopting environmentally friendly alternative protective cover gases. The industry may also seek to improve its energy efficiency and therefore reduce its CO2 emissions. DOE has developed the following software tools that may assist companies in such efforts. DOE BestPractices Software Tools DOE BestPractices offers a range of software tools and databases that help manufacturers assess their plant's steam, compressed air, motor, and process heating systems. DOE Plant Energy Profiler Industry experience has shown that many plant utility personnel do not have an adequate understanding of their energy cost structure and where the major focus should be for any energy savings program. This tool will

338

Climate VISION: Private Sector Initiatives: Magnesium: Resources and Links  

Office of Scientific and Technical Information (OSTI)

Plant Assessments 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 substances that have a tendency to oxidize explosively in air and require surface protection in casting processes. Save Energy Now Assessments The Save Energy Now assessments program is one way for plants of all sizes to work with the DOE Industrial Technologies Program (ITP). Large plants are eligible to apply for a system level assessment on their steam, process heating, compressed air, fans, or pumping systems. Assessments are conducted over a three day site visit by teams of DOE Energy Experts and plant personnel. The plant personnel are trained to identify energy savings opportunities using the DOE software tools. Most plants find an average of

339

Modeling the strength and ductility of magnesium alloys containing nanotwins  

SciTech Connect

Magnesium alloys have been receiving much attention recently as potential lightweight alternatives to steel for automotive and other applications, but the poor formability of these alloys at low temperatures has limited their widespread adoption for automotive applications. Recent work with face centered cubic (FCC) materials has shown that introduction of twins at the nanometer scale in ultra-fine grained FCC polycrystals can provide significant increase in strength with a simultaneous improvement in ductility. This objective of this work is to explore the feasibility of extending this concept to hexagonal close packed (HCP) materials, with particular focus on using this approach to increase both strength and ductility of magnesium alloys. A crystal plasticity based finite element (CPFE) model is used to study the effect of varying the crystallographic texture and the spacing between the nanoscale twins on the strength and ductility of HCP polycrystals. Deformation of the material is assumed to occur by crystallographic slip, and in addition to the basal and prismatic slip systems, slip is also assumed to occur on the {1 0 -1 1} planes that are associated with compression twins in these materials. The slip system strength of the pyramidal systems containing the nanotwins is assumed to be much lower than the strength of the other systems, which is assumed to scale with the spacing between the nanotwins. The CPFE model is used to compute the stress-strain response for different microstrucrutral parameters, and a criterion based on a critical slip system shear strain and a critical hydrostatic stress is used to compute the limiting strength and ductility, with the ultimate goal of identifying the texture and nanotwin spacing that can lead to the optimum values for these parameters.

Gorti, Sarma B [ORNL; Radhakrishnan, Balasubramaniam [ORNL

2013-01-01T23:59:59.000Z

340

Vasopressin, ATP and Catecholamines Differentially Control Potassium Secretion in Inner Ear Cell line  

E-Print Network (OSTI)

1 Vasopressin, ATP and Catecholamines Differentially Control Potassium Secretion in Inner Ear Cell and catecholamines stimulate while ATP inhibits apical potassium secretion by EC5v cells. These results open new OF ABBREVIATIONS ,-Me-ATP: ,-methylene-ATP ,-Me-ATP: ,-methylene ATP InsPs: total inositol phosphates Asn1 , Val5

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

High-pressure alloying of potassium and iron: Radioactivity in the Earth's core?  

E-Print Network (OSTI)

/U (potassium/uranium) ratios of $1 Ã? 104 on Earth are distinct from the 8 Ã? 104 ratio found in chondrites argued that because potassium is a moderately volatile element, it is depleted due to the high for the depletion of K in the terrestrial planets, as a mass-dependent depletion of the isotopes would

Lee, Kanani K. M.

342

X-RAY ABSORPTION SPECTROSCOPY OF TRANSITION METAL-MAGNESIUM HYDRIDE FILMS  

NLE Websites -- All DOE Office Websites (Extended Search)

Spectroscopy of Transition Metal-Magnesium Spectroscopy of Transition Metal-Magnesium Hydride Thin Films T. J. Richardson a, *, B. Farangis a , J. L. Slack a , P. Nachimuthu b , R. Pereira b , N. Tamura b , and M. Rubin a a Environmental Energy Technologies Division, b Advanced Light Source, Ernest Orlando Lawrence Berkeley National Laboratory Berkeley, California 94720, USA *Corresponding author, E-mail address: tjrichardson@lbl.gov Abstract Mixed metal thin films containing magnesium and a first-row transition element exhibit very large changes in both reflectance and transmittance on exposure to hydrogen gas. Changes in electronic structure and coordination of the magnesium and transition metal atoms during hydrogen absorption were studied using dynamic in situ transmission mode X-ray absorption

343

E-Print Network 3.0 - ammonium calcium magnesium Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

bres Summary: IP accumulation (97.862.1%) (Fig. 8). the osmolality with magnesium. Removal of extracellular1 calcium resulted... of HIP accumulation in the1 1 1 45 21...

344

Development of magnesium-based multilayer PVD coatings for hydrogen storage applications.  

E-Print Network (OSTI)

??On the long list of solid-state hydrogen storage materials, magnesium hydride stands out for its relatively high hydrogen storage capacity of 7.7 wt%, combined with… (more)

Fry, Christopher

2013-01-01T23:59:59.000Z

345

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

E-Print Network (OSTI)

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. ...

Somekawa, Hidetoshi

346

Quasiparticle lifetimes in magnesium clusters modeled by self-consistent GW? calculations  

E-Print Network (OSTI)

Quasiparticle (QP) lifetimes in magnesium clusters are calculated using many-body Green's-function theory. We analyze the effect of the self-consistency of the one-particle Green's function G on the calculations and ...

He, Yi

347

Crystal Plasticity Modelling of Large Strain Deformation in Single Crystals of Magnesium.  

E-Print Network (OSTI)

??Magnesium, with a Hexagonal Close-Packed (HCP) structure, is the eighth most abundant element in the earth’s crust and the third most plentiful element dissolved in… (more)

Izadbakhsh, Adel

2010-01-01T23:59:59.000Z

348

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

E-Print Network (OSTI)

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...

Modarres Razavi, Sonia

2012-02-14T23:59:59.000Z

349

Controlling the degradation rate of bioactive magnesium implants by electrophoretic deposition of akermanite coating  

Science Journals Connector (OSTI)

Abstract In order to improve the corrosion resistance and the surface bioactivity of biodegradable magnesium alloys, a nanostructured akermanite (Ca2MgSi2O7) coating was grown on AZ91 magnesium alloy through electrophoretic deposition (EPD) assisted with micro arc oxidation (MAO) method. The crystalline structures, morphologies and compositions of samples were characterized by X–ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The in vitro bio–corrosion (biodegradability) and bioactivity behaviors of samples were investigated by electrochemical and immersion tests. The experimental results indicated that the nanostructured akermanite coating could slow down the corrosion rate and improve the in vitro bioactivity of biodegradable magnesium alloy. Thus, magnesium alloy coated with nanostructured akermanite may be a promising candidate to be used as biodegradable bone implants.

Mehdi Razavi; Mohammadhossein Fathi; Omid Savabi; Seyed Mohammad Razavi; Batoul Hashemi Beni; Daryoosh Vashaee; Lobat Tayebi

2014-01-01T23:59:59.000Z

350

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

Energy.gov (U.S. Department of Energy (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.

351

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

E-Print Network (OSTI)

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...

Edgar, Susan Elaine

2012-06-07T23:59:59.000Z

352

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

E-Print Network (OSTI)

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...

Ashe, William Monroe

2012-06-07T23:59:59.000Z

353

An examination of the relationship between calcium and magnesium and hypertension  

E-Print Network (OSTI)

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...

Georghiades, Mary Elizabeth

2012-06-07T23:59:59.000Z

354

Effects of Dietary Magnesium Status on Indices of Muscular Dysfunction in Exercising Horses  

E-Print Network (OSTI)

EFFECT OF DIETARY MAGNESIUM STATUS ON INDICES OF MUSCULAR DYSFUNCTION IN EXERCISING HORSES A Thesis by CASSIDY ANNALIESE KURTZ 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 December 2009 Major Subject: Animal Science EFFECT OF DIETARY MAGNESIUM STATUS ON INDICES OF MUSCULAR DYSFUNCTION IN EXERCISING HORSES A Thesis by CASSIDY ANNALIESE KURTZ...

Kurtz, Cassidy A.

2011-02-22T23:59:59.000Z

355

X-Ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin  

NLE Websites -- All DOE Office Websites (Extended Search)

X-Ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin X-Ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin Films Title X-Ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin Films Publication Type Journal Article LBNL Report Number LBNL-50574 Year of Publication 2002 Authors Richardson, Thomas J., Baker Farangis, Jonathan L. Slack, Ponnusamy Nachimuthu, Rupert C. C. Perera, Nobumichi Tamura, and Michael D. Rubin Journal Journal of Alloys and Compounds Volume 356-357 Start Page 204 Pagination 204-207 Date Published 08/2003 Keywords A. hydrogen storage materials, NEXAFS, thin film s; C. EXAFS, x-ray diffraction Abstract Mixed metal thin films containing magnesium and a first-row transition element exhibit very large changes in both reflectance and transmittance on exposure to hydrogen gas. Changes in electronic structure and coordination of the magnesium and transition metal atoms during hydrogen absorption were studied using dynamic in situ transmission mode X-ray absorption spectroscopy. Mg K-edge and Ni, Co, and Ti L-edge spectra reflect both reversible and irreversible changes in the metal environments. A significant shift in the nickel L absorption edge shows it to be an active participant in hydride formation. The effect on cobalt and titanium is much less dramatic, suggesting that these metals act primarily as catalysts for formation of magnesium hydride.

356

Experimental study of a structural magnesium alloy with high absorption energy under dynamic loading  

SciTech Connect

It has been demonstrated that pure Mg exhibits low ductility under dynamic loading at room temperature owing to its HCP structure. Very limited data are currently available for magnesium alloys under dynamic loading. In order to be used for structural components, it is necessary to improve the mechanical properties of magnesium alloys. Lahaise et al. reported the yield strength of the AZ91 magnesium alloy increased with refining its microstructure. Mohri et al. has already been reported the ductility enhancement of a Mg-Y-RE(Rare Earth) alloy by hot extrusion. They mentioned the enhancement of ductility is due to the refining microstructure of magnesium. Thus refining microstructure enables to raise the possibility for the development of a structural magnesium alloy with high ductility at dynamic strain rate. In this paper, the possibility of a fine-grained WE43 magnesium alloy is investigated to raise the high speed impact performance against the foreign object damage by the enhancement of ductility and absorption energy under dynamic loading.

Mukai, T.; Ishikawa, K. [Osaka Municipal Technical Research Inst. (Japan). Mechanical Engineering Dept.] [Osaka Municipal Technical Research Inst. (Japan). Mechanical Engineering Dept.; Mohri, T. [Nagoya Municipal Industrial Research Inst. Rokuban, Atsuta (Japan)] [Nagoya Municipal Industrial Research Inst. Rokuban, Atsuta (Japan); Nakamura, M. [National Industrial Research Inst., Nagoya (Japan)] [National Industrial Research Inst., Nagoya (Japan); Higashi, K. [Osaka Prefecture Univ., Sakai (Japan)] [Osaka Prefecture Univ., Sakai (Japan)

1998-10-05T23:59:59.000Z

357

Types of red cell potassium in seven Spanish native breeds Paquita GONZALEZ Maria Jess TUON M. VALLEJO  

E-Print Network (OSTI)

Note Types of red cell potassium in seven Spanish native breeds of cattle Paquita GONZALEZ Maria Madrid, Spain Summary The distribution of red-cell potassium was studied in seven Spanish native breeds-equiv/1. For HK animals the means ranged from 50.8 to 66.1 m-equiv/1. Key word : red cell potassium

Paris-Sud XI, Université de

358

Chemical modification of surfaces: the effect of potassium on the chemisorption of molecules on transition metal crystal surfaces  

SciTech Connect

The physical and chemical properties of pure potassium monolayers and its effect on the adsorption of oxygen, carbon monoxide and benzene on the (111) faces of platinum and rhodium single crystals are described. Potassium adsorption on both surfaces is quite similar. Potassium forms hexagonally close packed structures that are incommensurate with the substrate. The heat of desorption of potassium on these surfaces decreases with increasing potassium coverage. The surface free electron density increases and the work function decreases substantially wtih alkali adsorption, indicating charge transfer occurs from potassium to the substrate. Oxygen adsorption increases the potassium binding energy, and forms a surface complex at high potassium coverages. Oxygen adsorption is dissociative on both clean and potassium dosed Rh(111). The metal-oxygen stretching vibration increases in the presence of potassium, indicating stronger adsorption. Carbon monoxide adsorption on both metal surfaces is strongly affected. With increasing potassium coverage, the heat of desorption increases while the C-O stretching frequencies decrease. Also, substantial population shifts from the atop to the bridged site occur. Dissociation of CO is induced on Rh(111) by the presence of potassium. Benzene is found to be ..pi.. bonded oriented with the ring plane parallel to the surface with C/sub 3v/(sigma/sub d/) symmetry on both the clean and potassium dosed Rh(111) surfaces. Potassium reduces the heat of desorption of molecular benzene and induces a lower temperature pathway to decomposition. The major influence of potassium is to increase the surface electron density, which, for molecular adsorbates with low lying vacant orbitals of the correct symmetry, can lead to substantial changes in their bonding with the surface.

Crowell, J.E.

1984-01-01T23:59:59.000Z

359

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

E-Print Network (OSTI)

effective in raising the phos- phorous content of peas. Their results support the theory that magnesium functions as a carrier of phosphorous. They also point out the need of giving more attention to the magnesium status of agricultural soils with a view... and magnesium deficiencies occurring in the same plant as developed under the experimental conditions stated above. Oftentimes poor growth of plants in the field may result from the lack of two or mox'e nutrients and such simultaneous characterization...

Ghosh, Debabrata

2012-06-07T23:59:59.000Z

360

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

E-Print Network (OSTI)

no apparent hormonal homeostatic mechanism exists for regulation of serum magnesium, the normal range results from a balance between gastrointestinal absorption and renal excretion. Factors influencing absorption of magnesium include dietary intake... populations remains to be established. Another abnormality associated with magnesium deficiency concerns the parathyroid gland which is the primary homeostatic mechanism that controls the plasma calcium concentration. PTH release is related to the total...

Carson, Sonja D'Awn

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Selective gas adsorption in a magnesium-based metalorganic Young Eun Cheon, Jungeun Park and Myunghyun Paik Suh*  

E-Print Network (OSTI)

Selective gas adsorption in a magnesium-based metal­organic frameworkw Young Eun Cheon, Jungeun magnesium-based porous metal­ organic framework exhibits thermal stability up to 500 1C and selective gas interpenetrated magnesium- based MOF, [Mg(TCPBDA)(H2O)2]Á6DMFÁ6H2O (1), where TCPBDA2� is N,N,N0 ,N0 -tetrakis(4

Paik Suh, Myunghyun

362

Biochemical aspects of vitamin E deficiency in fowl  

E-Print Network (OSTI)

.57 Vitamins^ 1.02 Supplied the following per kilogram of diet: calcium carbonate, 16.03 gm.5 dicalcium phosphate, 60.10 gm.; sodium chloride, 5.0 gin.; manganese sulfate, 1 .1*+ gm.5 ferric citrate, 1.6 gm.5 cupric sulfate, 20.0 mg.; zinc chloride, m.O mg....; potassium iodide, l+O.O mg.; cobalt chloride, 0.5 mg.; potassium chloride, 6.0 gm.; magnesium sulfate, 5.76 gm. 2 Supplied the following per kilogram of diet: riboflavin, 8.0 mg.; calcium pantothenate, 16.0 mg.; pyridoxine, 8.0 mg.; niacin, 120 mg...

Creech, Billy Gene

2013-10-04T23:59:59.000Z

363

A Parkinsonian Syndrome in Methcathinone Users and the Role of Manganese  

Science Journals Connector (OSTI)

...antibodies, CD4 lymphocyte counts, and liver function. In addition, serum ceruloplasmin and copper levels were measured. MRI was performed with a General Electric 1.0T Signa Horizon LX high-speed system with head coil and a standardized magnetic resonance examination protocol; sagittal, axial, and coronal T1... In this case series of 23 adults in Latvia who were injection users of methcathinone (a drug manufactured by users from readily available pharmaceutical agents such as pseudoephedrine), patients had an extrapyramidal syndrome, elevated serum manganese levels, and MRI abnormalities in the basal ganglia. These findings suggest that methcathinone use can result in neurologic toxic effects from manganese contained in the methcathinone solution.

Stepens A.; Logina I.; Liguts V.

2008-03-06T23:59:59.000Z

364

Study by IR-spectroscopy and adsorption of platinum-alumina catalysts modified by manganese  

SciTech Connect

Additions of Re are widely employed for modifying platinum-alumina catalysts (PAC). The effect of Mn on the catalysis of and the physicochemical properties of PAC has been less studied. It is only known that adding <0.2 wt. % Mn has no effect on the dispersity of the Pt crystallites. In this work the authors have studied the state of Pt in unmodified PAC by IR spectroscopy of adsorbed CO and by the adsorption of H/sub 2/ at elevated temperatures. The state of the metallic platinum in platinum-alumina catalysts modified by Mn is more heterogeneous than in the unmodified sample. When manganese is added, platinum crystallites with stronger electron-donor properties form on the surface of the catalyst. In platinum-alumina catalysts modified by manganese, there is an increase in the number of sites for the high-temperature dissociative adsorption of hydrogen located on the surface of the Mn-modified carrier.

Zaitsev, A.V.; Barkova, A.P.; Borovkov, B.Yu.; Sterligov, O.D.; Isagulyants, G.V.; Kazanskii, V.B.

1987-03-10T23:59:59.000Z

365

Effect of potassium permanganate as an oxidizing agent in the production of lignite-based fertilizers  

SciTech Connect

The purpose of this work was to observe the effect of potassium permanganate oxidation of lignites from Elbistan for end use as fertilizers, after being ammoniated. The experiments at each stage were designed by a 1/2 x full factorial design. The oxidation was carried out by three different methods. In the first two methods potassium permanganate in neutral or basic medium was used. In the other method two stages of oxidation were used: nitric acid followed by potassium permanganate in acidic medium. The latter proved to be more successful.

Baris, S.; Dincer, S.

1986-01-01T23:59:59.000Z

366

Ab Initio Thermodynamic Model for Magnesium Carbonates and Hydrates  

SciTech Connect

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.

Chaka, Anne M.; Felmy, Andrew R.

2014-03-28T23:59:59.000Z

367

Neutrino oscillation signatures of oxygen-neon-magnesium supernovae  

E-Print Network (OSTI)

We discuss the flavor conversion of neutrinos from core collapse supernovae that have oxygen-neon-magnesium (ONeMg) cores. Using the numerically calculated evolution of the star up to 650 ms post bounce, we find that, for the normal mass hierarchy, the electron neutrino flux in a detector shows signatures of two typical features of an ONeMg-core supernova: a sharp step in the density profile at the base of the He shell and a faster shock wave propagation compared to iron core supernovae. Before the shock hits the density step (t ~ 150 ms), the survival probability of electron neutrinos is about 0.68, in contrast to values of 0.32 or less for an iron core supernova. The passage of the shock through the step and its subsequent propagation cause a decrease of the survival probability and a decrease of the amplitude of oscillations in the Earth, reflecting the transition to a more adiabatic propagation inside the star. These changes affect the lower energy neutrinos first; they are faster and more sizable for larger theta_13. They are unique of ONeMg-core supernovae, and give the possibility to test the speed of the shock wave. The time modulation of the Earth effect and its negative sign at the neutronization peak are the most robust signatures in a detector.

C. Lunardini; B. Mueller; H. -Th. Janka

2007-12-18T23:59:59.000Z

368

MUTLI-OBJECTIVE OPTIMIZATION OF MICROSTRUCTURE IN WROUGHT MAGNESIUM ALLOYS  

SciTech Connect

The microstructural features that govern the mechanical properties of wrought magnesium alloys include grain size, crystallographic texture, and twinning. Several processes based on shear deformation have been developed that promote grain refinement, weakening of the basal texture, as well as the shift of the peak intensity away from the center of the basal pole figure - features that promote room temperature ductility in Mg alloys. At ORNL, we are currently exploring the concept of introducing nano-twins within sub-micron grains as a possible mechanism for simultaneously improving strength and ductility by exploiting a potential dislocation glide along the twin-matrix interface a mechanism that was originally proposed for face-centered cubic materials. Specifically, we have developed an integrated modeling and optimization framework in order to identify the combinations of grain size, texture and twin spacing that can maximize strength-ductility combinations. A micromechanical model that relates microstructure to material strength is coupled with a failure model that relates ductility to a critical shear strain and a critical hydrostatic stress. The micro-mechanical model is combined with an optimization tool based on genetic algorithm. A multi-objective optimization technique is used to explore the strength-ductility space in a systematic fashion and identify optimum combinations of the microstructural parameters that will simultaneously maximize the strength-ductility in the alloy.

Radhakrishnan, Balasubramaniam [ORNL] [ORNL; Gorti, Sarma B [ORNL] [ORNL; Simunovic, Srdjan [ORNL] [ORNL

2013-01-01T23:59:59.000Z

369

Magnesium Isotope Ratios in omega Centauri Red Giants  

E-Print Network (OSTI)

We have used high resolution observations obtained at the AAT with UHRF (R ~ 100,000) and at Gemini-S with b-HROS (R ~ 150,000) to determine magnesium isotope ratios for seven omega Centauri 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 Centauri 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 Centauri and M4 show (25Mg, 26Mg)/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 Centauri 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 26Mg/24Mg ratio is highest at intermediate metallicities ([Fe/H] < --1.4 dex), and for the highest [Al/Fe] values....

Da Costa, G S; Yong, David

2013-01-01T23:59:59.000Z

370

Calcium orthophosphate coatings on magnesium and its biodegradable alloys  

Science Journals Connector (OSTI)

Abstract Biodegradable metals have been suggested as revolutionary biomaterials for bone-grafting therapies. Of these metals, magnesium (Mg) and its biodegradable alloys appear to be particularly attractive candidates due to their non-toxicity and as their mechanical properties match those of bones better than other metals do. Being light, biocompatible and biodegradable, Mg-based metallic implants have several advantages over other implantable metals currently in use, such as eliminating both the effects of stress shielding and the requirement of a second surgery for implant removal. Unfortunately, the fast degradation rates of Mg and its biodegradable alloys in the aggressive physiological environment impose limitations on their clinical applications. This necessitates development of implants with controlled degradation rates to match the kinetics of bone healing. Application of protective but biocompatible and biodegradable coatings able to delay the onset of Mg corrosion appears to be a reasonable solution. Since calcium orthophosphates are well tolerated by living organisms, they appear to be the excellent candidates for such coatings. Nevertheless, both the high chemical reactivity and the low melting point of Mg require specific parameters for successful deposition of calcium orthophosphate coatings. This review provides an overview of current coating techniques used for deposition of calcium orthophosphates on Mg and its biodegradable alloys. The literature analysis revealed that in all cases the calcium orthophosphate protective coatings both increased the corrosion resistance of Mg-based metallic biomaterials and improved their surface biocompatibility.

Sergey V. Dorozhkin

2014-01-01T23:59:59.000Z

371

ENERGY LEVELS AND SPECTRAL LINES OF SINGLY IONIZED MANGANESE (Mn II)  

SciTech Connect

This compilation revises the previously recommended list of energy levels of singly ionized manganese (Mn II) and provides a comprehensive list of observed spectral lines and transition probabilities in this spectrum. The new level optimization takes into account critically assessed uncertainties of measured wavelengths and includes about a hundred high-precision wavelengths determined by laser spectroscopy and Fourier transform techniques. Uncertainties of 63% of energy levels and 74% of Ritz wavelengths are reduced by a factor of three on average.

Kramida, Alexander; Sansonetti, Jean E. [National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)] [National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)

2013-04-01T23:59:59.000Z

372

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

SciTech Connect

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.

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

1994-11-01T23:59:59.000Z

373

Demonstration of the 101st harmonic generated from a laser-produced manganese plasma  

SciTech Connect

We demonstrate the generation of the 101st harmonic (wavelength {lambda}=7.9 nm) from manganese plasma, which is generated using the plasma high-order harmonic technique. We also investigate the variation of the high-order harmonic distribution from the manganese plasma plume as a function of the prepulse and main pulse intensities. The harmonic cutoff was at the 31st order, for pump intensities below the barrier suppression intensity for singly charged Mn ions. However, by using higher prepulse and main pulse intensities, the harmonic cutoff was extended to the 101st order, with an appearance of second plateau for harmonics higher than the 31st order. In this case, the low-order harmonics decreased in intensity, or completely disappeared, and the spectrum for wavelengths longer than 27.6 nm was dominated by plasma line emission. The origin of the harmonics appearing at this short wavelength plateau is attributed to the interaction of the intense main pump laser field with doubly charged manganese ions.

Ganeev, R. A. [Institut National de la Recherche Scientifique, Centre Energie, Materiaux et Telecommunications, 1650 Lionel-Boulet, Varennes, Quebec, J3X 1S2 (Canada); Scientific Association Akadempribor, Academy of Sciences of Uzbekistan, Akademgorodok, Tashkent 100125 (Uzbekistan); Bom, L. B. Elouga; Kieffer, J.-C.; Ozaki, T. [Institut National de la Recherche Scientifique, Centre Energie, Materiaux et Telecommunications, 1650 Lionel-Boulet, Varennes, Quebec, J3X 1S2 (Canada); Suzuki, M.; Kuroda, H. [Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan)

2007-08-15T23:59:59.000Z

374

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

DOE Patents (OSTI)

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.

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

375

Use of manganese ore in chemical-looping combustion (CLC)—Effect on steam gasification  

Science Journals Connector (OSTI)

The chemical-looping combustion (CLC) process is a novel solution for efficient combustion with direct separation of carbon dioxide. The process uses a metal oxide as an oxygen carrier to transfer oxygen from an air to a fuel reactor, where the fuel reacts with the solid oxygen carrier. When solid fuel is used in CLC, the char needs to be gasified by e.g. steam to form H2 and CO that can be subsequently oxidized to H2O and CO2 by the oxygen carrier. In this work, the influence of the oxygen carrier on the rate of steam gasification is studied, by comparing the conversion of petcoke in the presence of manganese ore to that of ilmenite. The experiments were carried out in a fluidized-bed reactor at 970 °C using a fluidization gas of 50% steam in nitrogen. The manganese ore shows an increase by a factor five in the rate of steam gasification of char as compared to ilmenite. The dramatic increase in rate of steam gasification, in combination with potentially low costs of this material suggests that manganese ore could be an interesting material for CLC with solid fuels.

Mehdi Arjmand; Henrik Leion; Anders Lyngfelt; Tobias Mattisson

2012-01-01T23:59:59.000Z

376

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

DOE Patents (OSTI)

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.

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

1996-09-24T23:59:59.000Z

377

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)

GULF COAST SOILS OF TEXAS A Thesis by DOUGLAS P. PHILLIPS Approved as to style and content by: airman of Comnittee ea of Department em er ember Mem er Mem er Mem er December 1971 ABSTRACT Relationships Between Chemical Forms of Soil Iron... of iron (Fe) and manganese (Mn) in 34 Gulf Coast rice soils at 48 days from submergence . . . 44 6 Content of active iron and manganese, exchangeable iron and manganese (48 days from submergence), and water soluble iron and manganese (48 days from...

Phillips, Douglas Patton

1971-01-01T23:59:59.000Z

378

CO2 Capture by Absorption with Potassium Carbonate  

SciTech Connect

The objective of this work is to improve the process for CO{sub 2} capture by alkanolamine absorption/stripping by developing an alternative solvent, aqueous K{sub 2}CO{sub 3} promoted by piperazine. The best K{sup +}/PZ solvent, 4.5 m K{sup +}/4.5 m PZ, requires equivalent work of 31.8 kJ/mole CO{sub 2} when used with a double matrix stripper and an intercooled absorber. The oxidative degradation of piperazine or organic acids is reduced significantly by inhibitor A, but the production of ethylenediamine is unaffected. The oxidative degradation of piperazine in 7 m MEA/2 m PZ is catalyzed by Cu{sup ++}. The thermal degradation of MEA becomes significant at 120 C. The solubility of potassium sulfate in MEA/PZ solvents is increased at greater CO{sub 2} loading. The best solvent and process configuration, matrix with MDEA/PZ, offers 22% and 15% energy savings over the baseline and improved baseline, respectively, with stripping and compression to 10 MPa. The energy requirement for stripping and compression to 10 MPa is about 20% of the power output from a 500 MW power plant with 90% CO{sub 2} removal. The stripper rate model shows that a ''short and fat'' stripper requires 7 to 15% less equivalent work than a ''tall and skinny'' one. The stripper model was validated with data obtained from pilot plant experiments at the University of Texas with 5m K{sup +}/2.5m PZ and 6.4m K{sup +}/1.6m PZ under normal pressure and vacuum conditions using Flexipac AQ Style 20 structured packing. Experiments with oxidative degradation at low gas rates confirm the effects of Cu{sup +2} catalysis; in MEA/PZ solutions more formate and acetate is produced in the presence of Cu{sup +2}. At 150 C, the half life of 30% MEA with 0.4 moles CO{sub 2}/mole amine is about 2 weeks. At 100 C, less than 3% degradation occurred in two weeks. The solubility of potassium sulfate in MEA solution increases significantly with CO{sub 2} loading and decreases with MEA concentration. The base case corrosion rate in 5 M MEA/1.2M PZ is 22 mpy. With 1 wt% heat stable salt, the corrosion rate increases by 50% to 160% in the order: thiosulfate< oxalate

Gary T. Rochelle; Andrew Sexton; Jason Davis; Marcus Hilliard; Qing Xu; David Van Wagener; Jorge M. Plaza

2007-03-31T23:59:59.000Z

379

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

SciTech Connect

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.

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

380

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

SciTech Connect

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.

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

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Forming Analysis of AZ31 Magnesium Alloy Sheets by Means of a Multistep Inverse Approach  

SciTech Connect

This paper applies a multi-step inverse approach to predict the forming of AZ31 magnesium alloy sheets. An in-house finite element code named “INAPH”, which implements the inverse approach formulation by Guo et al. (Int. J. Numer. Methods Eng., 30, 1385-1401), has been used for the forming analysis. This inverse approach uses the deformation theory of plasticity and assumes that the deformation is independent of the loading history. Failure during forming is predicted by a stress-based criterion or a forming limit diagram-based criterion. The INAPH predictions have been compared with experimental results of Takuda et al (Journal of Materials Processing Technology, 89-90:135-140) and incremental analysis using ABAQUS. The multi-step inverse analysis has been shown to very quickly and fairly accurately predict stress, plastic strain, thickness distributions and failure locations on deeply drawn parts made of AZ31 magnesium alloy. The capability of INAPH to predict the formability of magnesium alloys has also been demonstrated at various temperatures. As magnesium alloys possess very limited formability at room temperature, and their formability becomes better at higher temperatures (> 100oC), the inverse analysis constitutes an efficient and valuable tool to predict forming of magnesium alloy parts as a function of temperature. In addition, other processing and design parameters such as the initial dimensions, final desired shape, blank holder forces, and friction can be quickly adjusted to assess the forming feasibility.

Nguyen, Ba Nghiep; Bapanapalli, Satish K.

2009-04-01T23:59:59.000Z

382

E-Print Network 3.0 - adenosine triphosphate-sensitive potassium...  

NLE Websites -- All DOE Office Websites (Extended Search)

<< < 1 2 3 4 5 > >> 1 Neuron, Vol. 38, 417432, May 8, 2003, Copyright 2003 by Cell Press ATP-Sensitive Potassium Channel Traffic Regulation Summary: Neuron, Vol. 38, 417-432, May...

383

E-Print Network 3.0 - atp sensitive potassium Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Search Powered by Explorit Topic List Advanced Search Sample search results for: atp sensitive potassium Page: << < 1 2 3 4 5 > >> 1 Na'-K+-ATPase activity in medullary...

384

Building an apparatus for ultracold lithium-potassium Fermi-Fermi mixtures  

E-Print Network (OSTI)

In this thesis, I designed and built laser systems to cool, trap and image lithium-6 and potassium-40 atoms. I also constructed the vacuum system for the experiment and experimentally tested a new method to coat the chamber ...

Campbell, Sara L., S.B. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

385

Potassium geopolymer foams made with silica fume pore forming agent for thermal insulation  

Science Journals Connector (OSTI)

Porous potassium based geopolymers with a mutli-scale porosity were synthesized. Silica fume is introduced as an additive to the geopolymer formulation. The free silicon contained inside this silica fume is ox...

Joseph Henon; Arnaud Alzina; Joseph Absi…

2013-02-01T23:59:59.000Z

386

The Transference Numbers of Potassium Bromide in Aqueous Solution at 25°C  

Science Journals Connector (OSTI)

The transference numbers for aqueous solutions of potassium bromide at 25°C have been determined by the moving boundary method. Cells with cadmium bromide and lithium bromide as cation indicators and with potassium iodate as anion indicator were employed. The measurements are more difficult than with potassium and sodium chlorides; with sheared junctions a thorough investigation of the effect of indicator concentration is necessary for each solution studied and the same is true with both sheared and autogenic boundaries of the effect of current density. The results differ slightly from those previously reported by Longsworth but are consistent with the known value of t + 0. Potassium bromide also differs from the alkali chlorides and acetates in that the Longsworth function t + 0? is not linear in the concentration thus precluding an independent extrapolation of the transference data.

A. G. Keenan; A. R. Gordon

1943-01-01T23:59:59.000Z

387

E-Print Network 3.0 - aqueous potassium acetate Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Heat at 70 C for 30'. 8. Add 100ml 5M potassium acetate, vortex 30". 9. Allow... to tube. 13. Invert to mix and ... Source: Singer, Mitchell - Section of Microbiology,...

388

Nested potassium hydroxide etching and protective coatings for silicon-based microreactors  

E-Print Network (OSTI)

We have developed a multilayer, multichannel silicon-based microreactor that uses elemental fluorine as a reagent and generates hydrogen fluoride as a byproduct. Nested potassium hydroxide etching (using silicon nitride ...

de Mas, Nuria

389

Improvement in corrosion resistance of micro arc oxidation coating formed on AZ91D magnesium alloy via applying a nano-crystalline sol–gel layer  

Science Journals Connector (OSTI)

Although magnesium is used in many industries, it is reactive and requires protection against aggressive environments. In this study, oxide coating was formed on AZ91D magnesium alloy using micro-arc oxidation (M...

M. Laleh; Farzad Kargar; A. Sabour Rouhaghdam

2011-08-01T23:59:59.000Z

390

Electron-Atom Superelastic Scattering in Magnesium at Millielectron Volt Energies T. Baynard, A. C. Reber, R. F. Niedziela,| S. A. Darveau, B. Prutzman,# and R. S. Berry*,  

E-Print Network (OSTI)

Electron-Atom Superelastic Scattering in Magnesium at Millielectron Volt Energies T. Baynard, A. C energy dependence of magnesium from threshold to 1400 eV10 with an energy resolution of 250 meV. Similar

Berry, R. Stephen

391

Sodium and potassium levels in the serum of acutely irradiated and non-irradiated rats  

E-Print Network (OSTI)

SODIUM AND POTASSIUM LEVELS IN THE SERUM OF ACUTELY IRRADIATED AND NON-IRRADIATED RATS A Thesis By DAVID PRESTON SHEPHERD Submitted to the Graduate College of the Texas ARM University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE August 1967 Major Subject: Zoology SODIUM AND POTASSIUM LEVELS IN THE SERUM OF ACUTELY IRRADIATED AND NON-IRRADIATED RATS A Thesis By DAVID PRESTON SHEPHERD Approved as to style and content by: (Chairman of Committee) (Head...

Shepherd, David Preston

2012-06-07T23:59:59.000Z

392

Effect of potassium carbonate on char gasification by carbon dioxide  

SciTech Connect

A differential packed-bed reactor has been employed to study the gasification of 7.5 wt% K/sub 2/CO/sub 3/-catalyzed Saran char in carbon dioxide/carbon monoxide mixtures at a total pressure near 1 atm (101.3 kPa) and temperatures between 922 and 1046 K. The rate data were tested with a model which involves two-site adsorption and subsequent dissociation of CO/sub 2/ on the char surface. The results indicate that this model adequately explains the catalyzed gasification data. Moreover, the activation energy for desorption of carbon-oxygen complex is lower for the catalyzed case than for the uncatalyzed case. Adsorption of CO and CO/sub 2/ on both catalyzed and uncatalyzed chars was also followed with a volumetric adsorption apparatus at pressures between 1 and 100 kPa and temperatures from 273 to 725 K. The catalyzed char adsorbed an order of magnitude more CO/sub 2/ at 560 K than the uncatalyzed char. Subsequent dissociation of CO/sub 2/ on the carbon surface does not appear to be catalyzed by potassium. Thus, the catalyst's role is to enhance CO/sub 2/ adsorption, thereby creating more oxygen on the surface, and lowering the activation energy for desorption of the resultant carbon-oxygen species.

Koenig, P.C.; Squires, R.G.; Laurendeau, N.M.

1986-07-01T23:59:59.000Z

393

The Nuclear Spin and Magnetic Moment of Potassium (41)  

Science Journals Connector (OSTI)

The spin of the K41 nucleus and the h.f.s. separation of the S122 normal state have been measured by the method of zero moments. The high resolution necessary to separate the two isotopes was obtained by passing a beam of neutral potassium atoms through a weak inhomogeneous magnetic field 153 cm long. The total beam length was 201 cm. A new method of analysis of the zero moment peak of K41 in relation to that of K39 was used in the determination of the spin. The spin was found to be 3/2 and the h.f.s. separation to be 0.554±0.2 percent of that of K39. The same ratio applies to the magnetic moments, hence this ratio and the values for K39 given by Fox and Rabi yield {??(K41),=0.00853±0.0001 cm-1}{?(K41),=0.22 nuclear Bohr magneton .} From the peak intensities it is possible to give the abundance ratio K39/K41 as 13.4±0.5.

J. H. Manley

1936-06-15T23:59:59.000Z

394

Lightning arrestor connector lead magnesium niobate qualification pellet test procedures.  

SciTech Connect

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.

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

2009-02-01T23:59:59.000Z

395

Structural studies of magnesium nitride fluorides by powder neutron diffraction  

SciTech Connect

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.

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

396

Materials Science and Engineering A 418 (2006) 341356 Microstructural effects of AZ31 magnesium alloy on its  

E-Print Network (OSTI)

Materials Science and Engineering A 418 (2006) 341­356 Microstructural effects of AZ31 magnesium Magnesium alloys exhibit the attractive combination of low densities (1.74 g/cm3 versus 2.7 g/cm3 for Al

Tong, Wei

397

Geochemical Aspects of the Carbonation of Magnesium Silicates in an Aqueous Medium  

NLE Websites -- All DOE Office Websites (Extended Search)

GEOCHEMICAL ASPECTS OF THE CARBONATION OF MAGNESIUM GEOCHEMICAL ASPECTS OF THE CARBONATION OF MAGNESIUM SILICATES IN AN AQUEOUS MEDIUM George D. Guthrie, Jr. (gguthrie@lanl.gov 505-665-6340) J. William Carey (bcarey@lanl.gov 505-667-5540) Deborah Bergfeld (debberrg@lanl.gov 505-667-1812) Darrin Byler (dbyler@lanl.gov 505-665-9562) Steve Chipera (chipera@lanl.gov 505-667-1110) Hans-Joachim Ziock (ziock@lanl.gov 505-667-7265) Hydrology, Geochemistry, & Geology Los Alamos National Laboratory Los Alamos, NM 87545 Klaus Lackner (ksl@lanl.gov 505-667-5694) Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM and Columbia University, New York, NY KEYWORDS: CO 2 sequestration, magnesium silicate, mineral carbonation INTRODUCTION The volume of carbon dioxide associated with the use of fossil fuels to produce

398

Coordination Chemistry in magnesium battery electrolytes: how ligands affect their performance  

SciTech Connect

Magnesium battery is potentially 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 performance and the lack of fundamental understandings of electrolytes. Here, we present a coordination chemistry study of Mg(BH4)2 in ethereal solvents. The O donor denticity, i.e. ligand strength of the ethereal solvents which act as ligands to form solvated Mg complexes, plays a significant role in enhancing coulombic efficiency of the corresponding solvated Mg complex electrolytes. A new and safer electrolyte is developed based on Mg(BH4)2, diglyme and optimized LiBH4 additive. The new electrolyte demonstrates 100% coulombic efficiency, no dendrite formation, and stable cycling performance with the cathode capacity retention of ~90% for 300 cycles in a prototype magnesium battery.

Shao, Yuyan; Liu, Tianbiao L.; Li, Guosheng; Gu, Meng; Nie, Zimin; Engelhard, Mark H.; Xiao, Jie; Lu, Dongping; Wang, Chong M.; Zhang, Jiguang; Liu, Jun

2013-11-04T23:59:59.000Z

399

Direct atomic-scale observation of layer-by-layer oxide growth during magnesium oxidation  

SciTech Connect

The atomic-scale oxide growth dynamics are directly revealed by in situ high resolution transmission electron microscopy during the oxidation of Mg surface. The oxidation process is characterized by the layer-by-layer growth of magnesium oxide (MgO) nanocrystal via the adatom process. Consistently, the nucleated MgO crystals exhibit faceted surface morphology as enclosed by (200) lattice planes. It is believed that the relatively lower surface energies of (200) lattice planes should play important roles, governing the growth mechanism. These results facilitate the understanding of the nanoscale oxide growth mechanism that will have an important impact on the development of magnesium or magnesium alloys with improved resistance to oxidation.

Zheng, He; Wu, Shujing; Sheng, Huaping; Liu, Chun; Liu, Yu; Cao, Fan; Zhou, Zhichao; Zhao, Dongshan, E-mail: wang@whu.edu.cn, E-mail: dszhao@whu.edu.cn; Wang, Jianbo, E-mail: wang@whu.edu.cn, E-mail: dszhao@whu.edu.cn [School of Physics and Technology, Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan 430072 (China); Zhao, Xingzhong [School of Physics and Technology, Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan 430072 (China)

2014-04-07T23:59:59.000Z

400

Cohesion enhancing effect of magnesium in aluminum grain boundary: A first-principles determination  

SciTech Connect

The effect of magnesium on grain boundary cohesion in aluminum was investigated by means of first-principles calculations using the Rice-Wang model [Rice and Wang, Mater. Sci. Eng. A 107, 23 (1989)]. It is demonstrated that magnesium is a cohesion enhancer with a potency of -0.11 eV/atom. It is further determined through electronic structure and bonding character analysis that the cohesion enhancing property of magnesium is due to a charge transfer mechanism which is unusually strong and overcomes the negative result of the size effect mechanism. Consistent with experimental results, this work clarifies the controversy and establishes that Mg segregation does not contribute to stress corrosion cracking in Al alloys.

Zhang Shengjun; Freeman, Arthur J. [Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208 (United States); Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208 (United States); Kontsevoi, Oleg Y. [Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208 (United States); Olson, Gregory B. [Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208 (United States)

2012-06-04T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Influence of Si Co-doping on electrical transport properties of magnesium-doped boron nanoswords  

SciTech Connect

Magnesium-doped boron nanoswords were synthesized via a thermoreduction method. The as-prepared nanoswords are single crystalline and {beta}-rhombohedral ({beta}-rh) phase. Electrical transport measurements show that variable range hopping conductivity increases with temperature, and carrier mobility has a greater influence than carrier concentration. These results are consistent with the three dimensional Mott's model (M. Cutler and N. F. Mott, Phys. Rev. 181, 1336 (1969)) besides a high density of localized states at the Fermi level compared with bulk {beta}-rh boron. Conductivity of Mg-doped boron nanoswords is significantly lower than that of ''pure'' (free of magnesium) boron nanoswords. Electron energy loss spectroscopy studies confirm that the poorer conductivity arises from silicon against magnesium doping.

Tian Yuan; Lu Hongliang; Tian Jifa; Li Chen; Hui Chao; Shi Xuezhao; Huang Yuan; Shen Chengmin; Gao Hongjun [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

2012-03-05T23:59:59.000Z

402

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)

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 properties of ferrites. The cation distribution in magnesium ferrite has been studied by various authors

Boyer, Edmond

403

THE JOURNAL OF CHEMICAL PHYSICS VOLUME 45, NUMBER 6 15 SEPTEMBER 1966 Correlation Effects in Complex Spectra. I. Term Energies for the Magnesium  

E-Print Network (OSTI)

in Complex Spectra. I. Term Energies for the Magnesium Isoelectronic Sequence* RICHARD N. ZAREt Department of the low-lying excited configurations of the magnesium isoelectronic sequence which are noted along the magnesium isoelectronic sequence, an examination is made of the significance that can

Zare, Richard N.

404

MAGNESIUM OXIDE AN ENGINEERED BARRIER 2009 EPA WIPP RECERTIFICATION FACT SHEET United States Environmental Protection Agency | Office of Air and Radiation (6608J) | June 2009  

E-Print Network (OSTI)

MAGNESIUM OXIDE ­ AN ENGINEERED BARRIER 2009 EPA WIPP RECERTIFICATION FACT SHEET United States://www.epa.gov/radiation/wipp/index.html MAGNESIUM OXIDE ­ AN ENGINEERED BARRIER Why is MgO Used At WIPP? The U.S. Department of Energy (DOE) proposed the use of magnesium oxide (MgO) as an engineered barrier in the Compliance Certification

405

Characterization of a new magnesium hydrogen orthophosphate salt, Mg3.5H2(PO4)3, synthesized in supercritical water  

E-Print Network (OSTI)

Characterization of a new magnesium hydrogen orthophosphate salt, Mg3.5H2(PO4)3, synthesized 2007 Available online 31 March 2007 Abstract Beige crystals of a new magnesium hydrogen orthophosphate water; IR and Raman spectra; Magnesium; Orthophosphate; Nanomaterial 1. Introduction Inorganic

Ryan, Dominic

406

Insertion of a magnesium(II)-octacarboranyl(hexylsulfanyl) porphyrazine into liposomes: a physico-chemical study  

E-Print Network (OSTI)

The synthesis, characterization and liposome insertion of a novel magnesium(II) carboranyl-porphyrazine, i.e. [2,3,7,8,12,13,17,18-octakis- (1,2-dicarba-closo-dodecaboranyl)-hexylthio-5,10,15,20- porphyrazine]magnesium(II) complex, MgHECSPz, is described. MgHECSPz was designed to improve the potentiality in multiple approach anticancer therapy. Liposomal formulations with different surface charge were prepared as delivering agents. The obtained loaded vectors were characterized by DLS, SAXS, SANS and \\zeta potential measurements in order to define the overall properties and structural details of loaded liposomes.

Anna Salvati; Sandra Ristori; Daniela Pietrangeli; Julian Oberdisse; Luca Calamai; Giacomo Martini; Giampaolo Ricciardi

2007-09-07T23:59:59.000Z

407

Physical Property of Magnesium Doped Barium Hexaferrite Particles By Citrate Precursor Route In Presence Of Surfactants  

SciTech Connect

M-type Barium Magnesium hexaferrite with the composition BaMg{sub 2}Fe{sub 10}O{sub 19} was successfully prepared with and without surfactant by using a citrate precursor route. The obtained precursors were calcined at various temperatures. The crystalline structure, phase analysis and particle size were investigated by using X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM) techniques. It is observed that the surfactant addition controls the microstructure of the formed Barium Magnesium hexaferrite particles and the type of surfactant plays a crucial role in deciding the morphology of particles.

Paladiya, Snehal; Chauhan, C. C.; Jotania, R. B. [Indus Institute of Technology and Engineering, Rancharda via Thaltej, Ahmedabad-382 115. Gujarat (India)

2010-12-01T23:59:59.000Z

408

DAFS study of site-specific local structure of Mn in manganese ferrite films.  

SciTech Connect

Manganese ferrite (MnFe{sub 2}O{sub 4}) is a well-known magnetic material widely used in electronics for many years. It is well established that its magnetic behavior is strongly influenced by local structural properties of Mn ions, which are distributed between crystallographically inequivalent tetrahedral and octahedral sites in the unit cell. In order to understand and be able to tune properties of these structures, it is necessary to have detailed site-specific structural information on the system. Here we report on the application of diffraction-anomalous fine structure (DAFS) spectroscopy to resolve site-specific Mn local structures in manganese ferrite films. The DAFS measurements were done at undulator beamline 4-ID-D of the Advanced Photon Source at Argonne National Laboratory. The DAFS spectra (Fig. 1) were measured at several Bragg reflections in the vicinity of the Mn absorption K-edge, having probed separately contributions from tetrahedrally and octahedrally coordinated Mn sites. The DAFS data analysis done with an iterative Kramers-Kroenig algorithm made it possible to solve separately the local structure around different inequivalent Mn sites in the unit cell. The reliability of the data treatment was checked carefully, and it was showed that the site-specific structural parameters obtained with DAFS allow us to describe fluorescence EXAFS spectrum measured independently. Fig. 2 shows individual site contributions to the imaginary part of the resonant scattering amplitude obtained from the treatment of the data of Fig. 1. The analysis of the refined site-specific absorption spectra was done using EXAFS methods based on theoretical standards. We provided direct evidence for the tetrahedral Mn-O bond distance being increased relative to the corresponding Fe-O distance in bulk manganese ferrites. The first coordination shell number was found to be reduced significantly for Mn atoms at these sites. This finding is consistent with the well-known tendency of Mn to be tetrahedrally coordinated in these compounds.

Kravtsov, E.; Haskel, D.; Cady, A.; Yang, A.; Vittoria, C.; Zuo, X.; Harris, V. G.; X-Ray Science Division; Inst. of Metal Physics; Northeastern Univ.; Nankai Univ.

2006-01-01T23:59:59.000Z

409

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

SciTech Connect

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.

None

2012-01-01T23:59:59.000Z

410

Reactivity of biogenic manganese oxide for metal sequestration and photochemistry: Computational solid state physics study  

SciTech Connect

Many microbes, including both bacteria and fungi, produce manganese (Mn) oxides by oxidizing soluble Mn(II) to form insoluble Mn(IV) oxide minerals, a kinetically much faster process than abiotic oxidation. These biogenic Mn oxides drive the Mn cycle, coupling it with diverse biogeochemical cycles and determining the bioavailability of environmental contaminants, mainly through strong adsorption and redox reactions. This mini review introduces recent findings based on quantum mechanical density functional theory that reveal the detailed mechanisms of toxic metal adsorption at Mn oxide surfaces and the remarkable role of Mn vacancies in the photochemistry of these minerals.

Kwon, K.D.; Sposito, G.

2010-02-01T23:59:59.000Z

411

Ultraviolet photoelectron spectroscopic study of the interaction of potassium with carbon monoxide and benzene on the Pt(111) surface  

SciTech Connect

The interaction of potassium with carbon monoxide and benezene has been studied on the Pt(111) crystal surface by ultraviolet photoelectron spectroscopy (UPS). The adsorptive changes reported in previous studies for carbon monoxide and benzene when potassium is coadsorbed are correlated with the UPS results presented here and are explained with the aid of a molecular orbital analysis. The authors find that the valence molecular orbitals increase their binding energy slightly when the potassium is coadsorbed, implying a model in which the adsorbates sense the potassium-induced changes in dipole field at the surface. 36 references, 11 figures.

Kudo, M.; Garfunkel, E.L.; Somorjai, G.A.

1985-07-18T23:59:59.000Z

412

Effect of Manganese Concentration in the Cd1-xMnxTe/CdTe Tandem Structure on Photovoltaic Energy Conversion  

Science Journals Connector (OSTI)

Abstract The photovoltaic electricity is obtained by direct conversion of sunlight into electricity by solar cells. The objective of this work is the study and simulation of a Tandem photovoltaic structure based on Cd1-xMnxTe as top material cell. This paper describes the optimization of energy efficiency for Cd1-xMnxTe thin films deposited by epitaxy on CdTe substrat. We present the impact of the manganese concentration in Cd1-xMnxTe thin films on solar cells performances. Our study includes simulation results to show the conversion efficiency and main performances factors as function of the manganese concentration.

A. Aissat; M. El Bey; M. Fathi; J.P. Vilcot

2013-01-01T23:59:59.000Z

413

Zinc and Magnesium in Human Prostate Gland: Normal, Hyperplastic, and Neoplastic  

Science Journals Connector (OSTI)

...hyperplastic gland. In addition, there was a marked...through a mixed-bed ion-exchange resin. All zinc and magnesium...plastic gland. In addition, there was a marked...S. Histochemi cal Demonstration of Zinc in the Dorsolateral...

Ferenc Györkey; Kyung-Whan Min; James A. Huff; and Phyllis Györkey

1967-08-01T23:59:59.000Z

414

American Institute of Aeronautics and Astronautics Performance Comparison between a Magnesium-and  

E-Print Network (OSTI)

that high-throughput vacuum pumps are not required for ground testing since these species will condense of 2700 s at 300 V. The anode efficiency was found to be ~23% using magnesium which is substantially lower than the 40% anode efficiency of xenon at approximately equivalent molar flow rates. A comparison

King, Lyon B.

415

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

416

Packaging and deployment of a 5. 5 MWe potassium---Rankine nuclear electric propulsion spacecraft  

SciTech Connect

A design study was performed to investigate packaging and deployment options for the potassium---Rankine, nuclear electric propulsion (NEP) spacecraft described by Rovang (1992). The subject spacecraft is the cargo portion of a split-sprint (cargo/piloted) Mars mission, carrying 144 mt of cargo. Two parallel SP-100 type reactors, potassium---Rankine power conversion assemblies, and argon ion thrusters are utilized in the selected architecture. A spacecraft design and deployment approach which uses two heavy lift launch vehicles (HLLV) to insert the entire spacecraft into low Earth orbit is presented.

Rovang, R.D.; Marko, M. (Rockwell International, Rocketdyne Division, 6633 Canoga Avenue, P.O. Box 7922, Canoga Park, California 91309-7922 (United States))

1993-01-20T23:59:59.000Z

417

Electron Paramagnetic Resonance Stopped-Flow Kinetic Study of Manganese(II) Sorption--Desorption on Birnessite  

E-Print Network (OSTI)

Electron Paramagnetic Resonance Stopped-Flow Kinetic Study of Manganese(II) Sorption- nique is demonstrated by investigating the sorption of Mn2+ on S- MnOj. The sorption reaction+ was observed. Measurement of the initial reaction rate al- lowed the forward (sorption) rate constant

Sparks, Donald L.

418

Thermodynamics of Potassium Exchange in Soil Using a Kinetics Approach1 D. L. SPARKS AND P. M. JARDINEZ  

E-Print Network (OSTI)

Thermodynamics of Potassium Exchange in Soil Using a Kinetics Approach1 D. L. SPARKS AND P. M. JARDINEZ ABSTRACT Thermodynamics of potassium (K) exchange using a kinetics ap- proach was investigated that more energy was needed to desorb K than to adsorb K. Thermodynamic and pseudother- modynamic parameters

Sparks, Donald L.

419

Local arc discharge mechanism and requirements of power supply in micro-arc oxidation of magnesium alloy  

Science Journals Connector (OSTI)

To study the requirements of the power supply in micro-arc oxidation (MAO) of magnesium alloy, many experiments ... . Based on the experimental results and electric arc theory, the separate local arc discharge me...

Ming Chen; Yuezhou Ma; Yuan Hao

2010-03-01T23:59:59.000Z

420

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

Energy.gov (U.S. Department of Energy (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...

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Role of cultivars to susceptibility to Magnesium deficiency a new disorder in Tomato in alfisols of India  

E-Print Network (OSTI)

1. Magnesium deficiency in F1 hybrids on open pollinatedEarly (Early) harvest F1 hybrid (late harvest) harvest)local cultivars with the F1 hybrids from Europe with semi

Muthaia, Edward Raja Dr

2009-01-01T23:59:59.000Z

422

Changes in the local environment surrounding magnesium ions in fragile MgO-SiO{sub 2} liquids.  

SciTech Connect

X-ray diffraction data have been collected in situ for a series of magnesium silicate liquids between and including the two mineral compositions enstatite and forsterite (MgSiO{sub 3} and Mg{sub 2}SiO{sub 4}). The pair distribution functions obtained from these data show that the local oxygen environment around the magnesium ions contrasts with that found in the equivalent glasses. We identify a transition window between 42 and 38 mole %SiO{sub 2} where the average magnesium coordination number changes on cooling from a Mg-O coordination number of {approx}5.1 {+-} 0.2 in the liquid state to a value of 4.5 {+-} 0.1 in the glass. This change in structure reflects a competition between a sparsely polymerized silicate network and a disordered magnesium framework in the liquid, while the silicate network dominates in the glass.

Wilding, M. C.; Benmore, C. J.; Weber, J. K. R.; X-Ray Science Division; Aberystwyth Univ.; Materials Development Inc.

2010-01-01T23:59:59.000Z

423

Study of second phase in bioabsorbable magnesium alloys: Phase stability evaluation via Dmol{sup 3} calculation  

SciTech Connect

Thermodynamical stabilities of four conventional second phases as well as magnesium matrix in bioabsorbable magnesium alloys were investigated theoretically via computer calculation method. Model of individual phase and systems including phase and four water molecular (phase-4H{sub 2}O) were established to simulate the in vitro and in vivo environment. Local orbital density functional theory approach was applied to calculate the total energy for the individual phase and phase-4H{sub 2}O system. The results demonstrated that all the second phases possessed higher phase stability compared with magnesium matrix, but the phase stability was quite different for different types of second phases or second phase-4H{sub 2}O systems. Furthermore, a schematic process of inflammation reaction caused by magnesium alloy implants was proposed for the further evaluation on biocompatibility of different second phases.

Yang, Huazhe [Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 (China); Department of Biophysics, China Medical University, Shenyang 110001 (China); Liu, Chen [Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 (China); Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094 (China); Wan, Peng; Tan, Lili; Yang, Ke, E-mail: kyang@imr.ac.cn [Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 (China)

2013-11-01T23:59:59.000Z

424

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

SciTech Connect

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.

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

2011-12-31T23:59:59.000Z

425

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

SciTech Connect

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.

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

426

Recovery of manganese oxides from spent alkaline and zinc–carbon batteries. An application as catalysts for VOCs elimination  

SciTech Connect

Highlights: • Manganese oxides were synthesized using spent batteries as raw materials. • Spent alkaline and zinc–carbon size AA batteries were used. • A biohydrometallurgical process was employed to bio-lixiviate batteries. • Manganese oxides were active in the oxidation of VOCs (ethanol and heptane). - Abstract: Manganese, in the form of oxide, was recovered from spent alkaline and zinc–carbon batteries employing a biohydrometallurgy process, using a pilot plant consisting in: an air-lift bioreactor (containing an acid-reducing medium produced by an Acidithiobacillus thiooxidans bacteria immobilized on elemental sulfur); a leaching reactor (were battery powder is mixed with the acid-reducing medium) and a recovery reactor. Two different manganese oxides were recovered from the leachate liquor: one of them by electrolysis (EMO) and the other by a chemical precipitation with KMnO{sub 4} solution (CMO). The non-leached solid residue was also studied (RMO). The solids were compared with a MnO{sub x} synthesized in our laboratory. The characterization by XRD, FTIR and XPS reveal the presence of Mn{sub 2}O{sub 3} in the EMO and the CMO samples, together with some Mn{sup 4+} cations. In the solid not extracted by acidic leaching (RMO) the main phase detected was Mn{sub 3}O{sub 4}. The catalytic performance of the oxides was studied in the complete oxidation of ethanol and heptane. Complete conversion of ethanol occurs at 200 °C, while heptane requires more than 400 °C. The CMO has the highest oxide selectivity to CO{sub 2}. The results show that manganese oxides obtained using spent alkaline and zinc–carbon batteries as raw materials, have an interesting performance as catalysts for elimination of VOCs.

Gallegos, María V., E-mail: plapimu@yahoo.com.ar [Pla.Pi.Mu-Planta Piloto Multipropósito, (CICPBA-UNLP) Cno. Centenario y 505, M.B. Gonnet, Buenos Aires (Argentina); Falco, Lorena R., E-mail: mlfalco@quimica.unlp.edu.ar [Pla.Pi.Mu-Planta Piloto Multipropósito, (CICPBA-UNLP) Cno. Centenario y 505, M.B. Gonnet, Buenos Aires (Argentina); Peluso, Miguel A., E-mail: apelu@quimica.unlp.edu.ar [Centro de Investigación y Desarrollo en Ciencias Aplicadas, “Dr. J. Ronco” CINDECA (CONICET CCT La Plata), 47 N°257, La Plata, Buenos Aires (Argentina); Sambeth, Jorge E., E-mail: sambeth@quimica.unlp.edu.ar [Centro de Investigación y Desarrollo en Ciencias Aplicadas, “Dr. J. Ronco” CINDECA (CONICET CCT La Plata), 47 N°257, La Plata, Buenos Aires (Argentina); Thomas, Horacio J. [Pla.Pi.Mu-Planta Piloto Multipropósito, (CICPBA-UNLP) Cno. Centenario y 505, M.B. Gonnet, Buenos Aires (Argentina)

2013-06-15T23:59:59.000Z

427

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

E-Print Network (OSTI)

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... of the requirements for the degree of MASTER OF SCIENCE December 1988 Major Subject: Animal Science THE DETERMINATION OF THE BIOAVAILABILITY AND THE SITE OF ABSORPTION IN LAMBS FED DIFFERENT SOURCES OF MAGNESIUM A Thesis by LEIGH ANNE HURLEY Approved...

Hurley, Leigh Anne

2012-06-07T23:59:59.000Z

428

Genetic diversity in chlorella viruses flanking kcv, a gene that encodes a potassium ion channel protein  

E-Print Network (OSTI)

Genetic diversity in chlorella viruses flanking kcv, a gene that encodes a potassium ion channel Received 23 March 2004; accepted 27 May 2004 Abstract The chlorella virus PBCV-1 encodes a 94-amino acid additional chlorella viruses and transcription in two of these viruses, as well as the effect of the three

Graves, Michael V.

429

Genetic Analysis of Salt Tolerance in Arabidopsis: Evidence for a Critical Role of Potassium Nutrition  

Science Journals Connector (OSTI)

...certain threshold levels in the presence of excess external Na+ is critical for plant growth...7447-40-7 Potassium Chloride 7447-41-8 Lithium Chloride 7647-14-5 Sodium Chloride...Methanesulfonate Fast Neutrons Genes, Plant Lithium Chloride pharmacology Mutagenesis Osmolar...

Jian-Kang Zhu; Jiping Liu; Liming Xiong

430

Biogenic Potassium Salt Particles as Seeds for Secondary Organic Aerosol in the Amazon  

Science Journals Connector (OSTI)

...potassium and sulfur has been attributed to local biogenic sources (24–26), which is...A description of the advanced research WRF version 3” [National Center for Atmospheric...the Weather Research and Forecasting (WRF) model simulations. We gratefully acknowledge...

Christopher Pöhlker; Kenia T. Wiedemann; Bärbel Sinha; Manabu Shiraiwa; Sachin S. Gunthe; Mackenzie Smith; Hang Su; Paulo Artaxo; Qi Chen; Yafang Cheng; Wolfgang Elbert; Mary K. Gilles; Arthur L. D. Kilcoyne; Ryan C. Moffet; Markus Weigand; Scot T. Martin; Ulrich Pöschl; Meinrat O. Andreae

2012-08-31T23:59:59.000Z

431

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

SciTech Connect

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.

STUBBS, A.M.

2001-02-01T23:59:59.000Z

432

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

DOE Patents (OSTI)

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.

Boyle, T.J.

1999-01-12T23:59:59.000Z

433

The effect of rare earth elements on the texture and formability of asymmetrically rolled magnesium sheet  

SciTech Connect

The lack of formability is a serious issue when considering magnesium alloys for various applications. Standard symmetric rolling introduces a strong basal texture that decreases the formability; however, asymmetric rolling has been put forward as a possible route to produce sheet with weaker texture and greater ductility. It has also been shown in recent work that weaker textures can be produced through the addition of rare earth elements to magnesium alloys. Therefore, this study has been carried out to investigate the effect of rare earth additions on the texture changes during asymmetric rolling. Two alloys have been used, AZ31B and ZEK100. The effect that the rare earth additions have on the texture of asymmetrically rolled sheet and the subsequent changes in formability will be discussed.

Alderman, Dr. Martyn [Magnesium Elektron North America; Cavin, Odis Burl [ORNL; Davis, Dr. Bruce [Magnesium Elektron North America; Muralidharan, Govindarajan [ORNL; Muth, Thomas R [ORNL; Peter, William H [ORNL; Randman, David [Magnesium Elektron North America; Watkins, Thomas R [ORNL

2011-01-01T23:59:59.000Z

434

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

DOE Patents (OSTI)

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.

Boyle, Timothy J. (Albuquerque, NM)

1999-01-12T23:59:59.000Z

435

Sorption of Ferric Iron from Siderophore Complexes by Layer Type Manganese  

NLE Websites -- All DOE Office Websites (Extended Search)

Sorption of Ferric Iron from Siderophore Complexes by Layer Type Sorption of Ferric Iron from Siderophore Complexes by Layer Type Manganese Oxides Owen W. Duckworth (North Carolina State University), John R. Bargar (Stanford Synchrotron Radiation Lightsource), and Garrison Sposito (University of California-Berkeley) figure 1 Figure 1. Top: Iron is thought to limit phytoplankton in much of the world's oceans. Bottom: Structure of the iron-siderophore complex ferrioxamine B [Fe(III)HDFOB+]. Image courtesy of Andrzej Jarzecki, Brooklyn College, the City University of New York. Iron is one of several essential nutrients thought to limit phytoplankton growth in large areas of the world's oceans. The growth of marine phytoplankton represents a important linkage in the carbon cycle, accounting for approximately 50% of the total biological uptake of carbon

436

3-D Atomic-Scale Mapping of Manganese Dopants in Lead Sulfide Nanowires  

SciTech Connect

Dopants in nanowires, whether intentional or unintentional, can ultimately control the material's properties and therefore need to be understood on the atomic scale. We study vapor-liquid-solid grown manganese-doped lead sulfide nanowires by atom-probe tomography for the first time for lead salt materials. The three-dimensional chemical concentration maps at the atomic scale demonstrate a radial distribution profile of Mn ions, with a concentration of only 0.18 at.% and 0.01 at.% for MnCl2 and Mn-acetate precursors, respectively. The ability to characterize these small concentrations of dopant atoms in Pb1-xMnxS nanowires (x = 0.0036 and 0.0002), important for spintronic and thermoelectric devices, sets a platform for similar analyses for all nanostructures. First-principles calculations confirm that Mn atoms substitute for Pb in the PbS structure.

Isheim, Dieter; Kaszpurenko, Jason; Yu, Dong; Mao, Zugang; Seidman, David N.; Arslan, Ilke

2012-03-22T23:59:59.000Z

437

Hole dispersions in the G- and C-type orbital ordering backgrounds: Doped manganese oxides  

Science Journals Connector (OSTI)

In the framework of the linear spin-wave theory and orbital-charge separation, we calculate quasiparticle (QP) dispersions for two different antiferromagnetic orbital structures in the fully saturated spin phase of manganese oxides. Although with the same orbital wave excitations, the QP bands of C- and G-type orbital structures exhibit completely different shapes. The pseudogap observed in the density of states and spectral functions around ?=0 is related with the large antiferromagnetic orbital fluctuation. The minimal band energy for G-type is lower than that for C-type orbital order, while these band curves almost coincide in some momentum points. Larger energy splitting occurs between the two branches of kz=0 and kz=? when increasing the superexchange coupling J, suggesting that the orbital scattering plays an essential role in the QP dispersions.

Xiao-Juan Fan; Shun-Qing Shen; Z. D. Wang; X.-G. Li; Qiang-Hua Wang

2000-08-01T23:59:59.000Z

438

Electronic structure and magnetic properties of the perovskite cerium manganese oxide from ab initio calculations  

Science Journals Connector (OSTI)

Abstract We have performed first-principle calculations of the structural, electronic and magnetic properties of cerium manganese oxide (CeMnO)3, using full-potential linearized augmented plane-wave (FP-LAPW) scheme within GGA and GGA+U approaches. Features such as the lattice constant, bulk modulus and its pressure derivative are reported. Also, we have presented our results of the band structure and the density of states. The results show a half-metallic ferromagnetic ground state for CeMnO3 in GGA+U treatment, whereas semi-metallic ferromagnetic character is observed in GGA. The results obtained, make the cubic CeMnO3 a candidate material for future spintronic application.

Saadi Berri; Djamel Maouche; Miloud Ibrir; Badis Bakri

2014-01-01T23:59:59.000Z

439

The Absorption Spectrum of Manganese Vapor in the Visible and Ultraviolet  

Science Journals Connector (OSTI)

With an absorbing column of the vapor about 3 cm long heated to temperatures between 1200°C and 1600°C, absorption was observed at 31 lines. Grotrian had previously reported absorption at 6 of these lines. All of the absorptions are from manganese atoms in the normal state (1s6 term) and occur in groups of 1, 2 and 3 lines. Five absorption lines represent 1s6-d?6 combinations for which the rule of inner quantum numbers is obeyed but the azimuthal quantum number changes by 2. Four lines are 1s6-p8 combinations and twelve are 1s6-p6 combinations. Some of the remainder are perhaps 1s6-p4 and 1s6-p2 combinations.

R. V. Zumstein

1925-12-01T23:59:59.000Z

440

Large scale two-dimensional arrays of magnesium diboride superconducting quantum interference devices  

SciTech Connect

Magnetic field sensors based on two-dimensional arrays of superconducting quantum interference devices were constructed from magnesium diboride thin films. Each array contained over 30?000 Josephson junctions fabricated by ion damage of 30?nm weak links through an implant mask defined by nano-lithography. Current-biased devices exhibited very large voltage modulation as a function of magnetic field, with amplitudes as high as 8?mV.

Cybart, Shane A., E-mail: scybart@ucsd.edu; Dynes, R. C. [Department of Physics, University of California San Diego, La Jolla, California 92093 (United States); Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Wong, T. J.; Cho, E. Y. [Department of Physics, University of California San Diego, La Jolla, California 92093 (United States); Beeman, J. W. [Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Yung, C. S.; Moeckly, B. H. [Superconductor Technologies Inc., Santa Barbara, California 93111 (United States)

2014-05-05T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Original article Effect of calcium and magnesium ions on the intestinal  

E-Print Network (OSTI)

Original article Effect of calcium and magnesium ions on the intestinal absorption of oleic acid models : rat isolated jejunal loops at 30°C and 37°C and mouse jejunal explants at 37°C. At 30°C or at 37°C, Ca++ significantly increased 14C oleic acid uptake by rat isolated jejunal loops or mouse jejunal

Paris-Sud XI, Université de

442

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

E-Print Network (OSTI)

of MASTER OP SCIENCE August 1969 Major Subject Plant ~ph ~siolo THE TOLERANCE OF TvJO VARIETIES OF COTTON TO RELATIVELY HIGH LEVELS OF SODIUN AND NAGNESIUN A Thesis by Nanhar C. Parekh Approved as to style and content by: (Head of Department...) (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...

Parekh, Manhar C

2012-06-07T23:59:59.000Z

443

Elevated manganese and cognitive performance in school-aged children and their mothers  

SciTech Connect

Background: Growing evidence suggests that excess manganese (Mn) in children is associated with neurobehavioral impairments. In Brazil, elevated hair Mn concentrations were reported in children living near a ferro-manganese alloy plant. Objectives: We investigated these children's and caregivers' cognitive function in relation to bioindicators of Mn exposure. Methods: In this cross-sectional study, the WISC-III was administered to 83 children aged between 6 and 12 years; the Raven Progressive Matrix was administered to the primary caregivers (94% mothers), who likewise responded to a questionnaire on socio demographics and birth history. Mn in hair (MnH) and blood (MnB) and blood lead (PbB) were measured by graphite furnace atomic absorption spectrometry (GFAAS). Results: Children's mean MnB and MnH were 8.2 {mu}g/L (2.7-23.4) and 5.83 {mu}g/g (0.1-86.68), respectively. Mean maternal MnH was 3.50 {mu}g/g (0.10-77.45) and correlated to children's MnH (rho=0.294, p=0.010). Children's MnH was negatively related to Full-Scale Intelligence Quotient (IQ) and Verbal IQ; {beta} coefficients for MnH were -5.78 (95% CI -10.71 to -0.21) and -6.72 (-11.81 to -0.63), adjusted for maternal education and nutritional status. Maternal MnH was negatively associated with performance on the Raven's ({beta}=-2.69, 95% CI -5.43 to 0.05), adjusted for education years, family income and age. Conclusions: These findings confirm that high MnH in children is associated with poorer cognitive performance, especially in the verbal domain. Primary caregiver's IQ is likewise associated to Mn exposure, suggesting that, in this situation, children's cognition may be affected directly and indirectly by Mn exposure.

Menezes-Filho, Jose A., E-mail: antomen@ufba.br [College of Pharmacy, Federal University of Bahia (Brazil); Public and Environmental Health Program, National School of Public Health, Oswaldo Cruz Foundation (Brazil); Novaes, Cristiane de O.; Moreira, Josino C.; Sarcinelli, Paula N. [Public and Environmental Health Program, National School of Public Health, Oswaldo Cruz Foundation (Brazil)] [Public and Environmental Health Program, National School of Public Health, Oswaldo Cruz Foundation (Brazil); Mergler, Donna [Centre de Recherche Interdisciplinaire sur la Biologie, la Sante, la Societe et l'Environnement (CINBIOSE), Universite du Quebec a Montreal (Canada)] [Centre de Recherche Interdisciplinaire sur la Biologie, la Sante, la Societe et l'Environnement (CINBIOSE), Universite du Quebec a Montreal (Canada)

2011-01-15T23:59:59.000Z

444

Low Frequency-SAFT Inspection Methodology for Coarse-Grained Steel Rail Components (Manganese Steel Frogs)  

SciTech Connect

In the rail industry, sections of high strength Manganese steel are employed at critical locations in railroad networks. Ultrasonic inspections of Manganese steel microstructures are difficult to inspect with conventional means, as the propagation medium is highly attenuative, coarse-grained, anisotropic and nonhomogeneous in nature. Current in-service inspection methods are ineffective while pre-service X-ray methods (used for full-volumetric examinations of components prior to shipment) are time-consuming, costly, require special facilities and highly trained personnel for safe operations, and preclude manufacturers from inspecting statistically meaningful numbers of frogs for effective quality assurance. In-service examinations consist of visual inspections only and by the time a defect or flaw is visually detected, the structural integrity of the component may already be compromised, and immediate repair or replacement is required. A novel ultrasonic inspection technique utilizing low frequency ultrasound (100 to 500 kHz) combined with a synthetic aperture focusing technique (SAFT) for effective reduction of signal clutter and noise, and extraction of important features in the data, has proven to be effective for these coarse grained steel components. Results from proof-of-principal tests in the laboratory demonstrate an effective means to detect and localize reflectors introduced as a function of size and depth from the top of the frog rail. Using non-optimal, commercially available transducers coupled with the low-frequency/SAFT approach, preliminary evaluations were conducted to study the effects of the material microstructure on ultrasonic propagation, sensitivity and resolution in thick section frog components with machined side-drilled holes. Results from this study will be presented and discussed.

Diaz, Aaron A.; Andersen, Eric S.; Samuel, Todd J.

2004-11-01T23:59:59.000Z

445

Development of an inert ceramic anode to reduce energy consumption in magnesium production. Final Report  

SciTech Connect

The objective of this work is to develop a dimensionally stable ceramic anode for production of magnesium metal in electrolytic cells, replacing the graphite anodes currently used by The Dow Chemical Company magnesium business. The work is based on compositional and design technology for a ceramic anode developed in the former Central Research Inorganic Laboratory. The approach selected is to use a ceramic semiconductor tube as the material to interface with the bath and gaseous atmosphere in the cell. The testing goal was to demonstrate six anodes surviving a 30 day test lifetime with acceptable wear rates and electrical performance in a laboratory scale magnesium cell test. State of the art slip casting techniques were used and advanced in the pursuit of a virtually flaw free ceramic anode shell. Novel core materials were also invented to allow for the complete, crack free fabrication of the laboratory scale anode. Two successive anodes were tested and exceeded the 30 day cell lifetime goal with excellent wear characteristics. More aggressive testing of the ceramic anode revealed that the anode had a rather narrow operating region.

NONE

1997-06-01T23:59:59.000Z

446

CO{sub 2} laser beam welding of magnesium-based alloys  

SciTech Connect

Magnesium has gained increased attention in recent years as a structural metal--especially in the automotive industry--necessitating the development of welding techniques qualified for this new application. Lasers are known to be an excellent tool for joining metals. This paper presents results of recent investigations on the weldability of several cast and wrought magnesium-based alloys. Plates with a thickness of 2.5--8 mm were butt joint welded with and without filler metal using a 2.5-kW CO{sub 2} laser. The investigations showed that magnesium alloys can be easily laser welded in similar and dissimilar joints. The beam characteristics of the laser leads to small welds and a deep penetration depth. Crackfree welds exhibiting low porosity and good surface finish can be achieved with appropriate process parameters. Generally, the laser welding leads to either no change or a small increase in hardness in the fusion zone (FZ) and in the heat-affected zone (HAZ) relative to the base metal. Less promising results were obtained for the cast alloy QE22, in which cracking in the age-hardened condition and a significant decrease in hardness occurred. Laser welded die cast alloys showed an extremely high level of porosity in the weld.

Weisheit, A.; Galun, R.; Mordike, B.L. [Technische Univ. Clausthal, Clausthal-Zellerfeld (Germany). Inst. fuer Werkstoffkunde und Werkstofftechnik

1998-04-01T23:59:59.000Z

447

Yield Asymmetry Design of Magnesium Alloys by Integrated Computational Materials Engineering  

SciTech Connect

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.

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

2013-11-01T23:59:59.000Z

448

Manufacturing of SiCp Reinforced Magnesium Composite Tubes by Hot Extrusion Processes  

SciTech Connect

Magnesium alloys have higher specific strength compared with other metals, such as aluminum, copper and steel. Nevertheless, their ductility is still not good for further metal forming and their strength is not large enough for real structure applications. The aim of this paper is to develop magnesium alloy composite tubes reinforced with SiC particulates by the stir-casting method and hot extrusion processes. At first, AZ61/SiCp composite ingots reinforced with 5 wt% SiC particulates are fabricated by the melt-stirring technique. Then, finite element simulations are conducted to analyze the plastic flow of magnesium alloy AZ61 within the die and the temperature distribution of the products. AZ61/SiCp composite tubes are manufactured by hot extrusion using a specially designed die-set for obtaining uniform thickness distribution tubes. Finally, the mechanical properties of the reinforced AZ61/SiCp composite and Mg alloy AZ61 tubes are compared with those of the billets to manifest the advantages of extrusion processes and reinforcement of SiC particulates. The microstructures of the billet and extruded tubes are also observed. Through the improvement of the strength of the tube product, its life cycle can be extended and the energy consumption can be reduced, and eventually the environmental sustainability is achieved.

Hwang, Yeong-Maw [National Sun Yat-Sen University-Department of Mechanical and Electro-mechanical Engineering, No.70, Lien-Hai Rd., Kaohsiung, Taiwan (China); Huang, Song-Jeng; Huang, Yu-San [National Chung Cheng University-Department of Mechanical Engineering, 168 University Rd. Ming-Hsiung, ChiaYi, Taiwan (China)

2011-05-04T23:59:59.000Z

449

Suppression of manganese-dependent production of nitric oxide in astrocytes: implications for therapeutic modulation of glial-derived inflammatory mediators  

E-Print Network (OSTI)

Primary cultured astrocytes were treated with Mn in the absence and presence of proinflammatory cytokines to determine their effect upon stimulation of nitric oxide (NO) production. Treatments of manganese and cytokines raised NO production...

Wright, Tyler T.

2009-05-15T23:59:59.000Z

450

Pillared smectite modified with carbon and manganese as catalyst for SCR of NOx with NH3. Part I. General characterization and catalyst screening  

Science Journals Connector (OSTI)

Carbon- and manganese-modified zirconia-pillared smectites were prepared, characterized (XRD, BET and pore analysis, XPS) and tested in selective catalytic reduction of NOx with NH3. Both untreated and acidic pre...

Lucjan Chmielarz; Roman Dziembaj; Teresa Grzybek; Jerzy Klinik…

451

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)

THE DISTRIBUTION OF COPPER, MANGANESE, ZINC, AND IRON IN ANTARCTIC WATERS AND THE RELATION OF THE CONCENTRATIONS OF THESE METALS TO BIOLOGICAL PRIMARY PRODUCTIVITY A Thesis By MARTIN EDWARD ARHELGER Submitted to the Graduate College... of the Texas A& 1 University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August I967 Major Subj ect: CHEMICAL OCEANOGRAPHY THE DISTRIBUTION OF COPPER, MANGANESE, ZINC, AND IRON IN ANTARCTIC WATERS AND THE RELATION...

Arhelger, Martin Edward

1967-01-01T23:59:59.000Z

452

Construction and Commissioning of a Collinear Laser Spectroscopy Setup at TRIGA Mainz and Laser Spectroscopy of Magnesium Isotopes at ISOLDE (CERN)  

E-Print Network (OSTI)

Construction and Commissioning of a Collinear Laser Spectroscopy Setup at TRIGA Mainz and Laser Spectroscopy of Magnesium Isotopes at ISOLDE (CERN)

Kraemer, Joerg

453

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

SciTech Connect

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.

Marzik, James, V.

2005-10-13T23:59:59.000Z

454

Inverse association of intellectual function with very low blood lead but not with manganese exposure in Italian adolescents  

SciTech Connect

Background: Pediatric lead (Pb) exposure impacts cognitive function and behavior and co-exposure to manganese (Mn) may enhance neurotoxicity. Objectives: To assess cognitive and behavioral function in adolescents with environmental exposure to Pb and Mn. Methods: In this cross sectional study, cognitive function and behavior were examined in healthy adolescents with environmental exposure to metals. The Wechsler Intelligence Scale for Children (WISC) and the Conners-Wells' Adolescent Self-Report Scale Long Form (CASS:L) were used to assess cognitive and behavioral function, respectively. ALAD polymorphisms rs1800435 and rs1139488 were measured as potential modifiers. Results: We examined 299 adolescents (49.2% females) aged 11-14 years. Blood lead (BPb) averaged 1.71 {mu}g/dL (median 1.5, range 0.44-10.2), mean Blood Manganese (BMn) was 11.1 {mu}g/dL (median 10.9, range 4.00-24.1). Average total IQ was 106.3 (verbal IQ=102, performance IQ=109.3). According to a multiple regression model considering the effect of other covariates, a reduction of about 2.4 IQ points resulted from a two-fold increase of BPb. The Benchmark Level of BPb associated with a loss of 1 IQ-point (BML01) was 0.19 {mu}g/dL, with a lower 95% confidence limit (BMLL01) of 0.11 {mu}g/dL. A very weak correlation resulted between BPb and the ADHD-like behavior (Kendall's tau rank correlation=0.074, p=0.07). No influence of ALAD genotype was observed on any outcome. Manganese was not associated with cognitive and behavioral outcomes, nor was there any interaction with lead. Conclusions: These findings demonstrate that very low level of lead exposure has a significant negative impact on cognitive function in adolescent children. Being an essential micro-nutrient, manganese may not cause cognitive effects at these low exposure levels.

Lucchini, Roberto G., E-mail: lucchini@med.unibs.it [Department of Preventive Medicine, Mount Sinai School of Medicine, NY (United States); Section of Occupational Medicine, University of Brescia, P.le Spedali Civili 1, 25123 Brescia (Italy); Zoni, Silvia [Section of Occupational Medicine, University of Brescia, P.le Spedali Civili 1, 25123 Brescia (Italy)] [Section of Occupational Medicine, University of Brescia, P.le Spedali Civili 1, 25123 Brescia (Italy); Guazzetti, Stefano [Public Health Service, Reggio Emilia (Italy)] [Public Health Service, Reggio Emilia (Italy); Bontempi, Elza [INSTM and Chemistry for Technologies Laboratory, University of Brescia (Italy)] [INSTM and Chemistry for Technologies Laboratory, University of Brescia (Italy); Micheletti, Serena [Cognition Psychology Neuroscience lab., University of Pavia and Unit of Child Neurology and Psychiatry, Civil Hospital of Brescia (Italy)] [Cognition Psychology Neuroscience lab., University of Pavia and Unit of Child Neurology and Psychiatry, Civil Hospital of Brescia (Italy); Broberg, Karin [Division of Occupational and Environmental Medicine, Lund University (Sweden)] [Division of Occupational and Environmental Medicine, Lund University (Sweden); Parrinello, Giovanni [Statistics and Biometry, University of Brescia (Italy)] [Statistics and Biometry, University of Brescia (Italy); Smith, Donald R. [Microbiology and Environmental Toxicology, University of California at Santa Cruz (United States)] [Microbiology and Environmental Toxicology, University of California at Santa Cruz (United States)

2012-10-15T23:59:59.000Z

455

Potassium-Rankine power conversion subsystem modeling for nuclear electric propulsion  

SciTech Connect

A potassium-Rankine power conversion system model was developed under Contract No. NAS3-25808 for the NASA-LeRC. This model predicts potassium-Rankine performance for turbine inlet temperatures (TIT) from 1200 - 1600 K, TIT to condenser temperature ratios from 1.25-1.6, power levels from 100 to 10,000 kWe, and lifetimes from 2-10 years. The model is for a Rankine cycle with reheat for turbine stage moisture control. The model assumes heat is supplied from a lithium heat transport loop. The model does not include a heat source or a condenser/heat rejection system model. These must be supplied by the user.

Johnson, G.A.

1993-09-01T23:59:59.000Z

456

Contribution of potassium channels to myogenic response in skeletal muscle arterioles: effects of age and fiber type  

E-Print Network (OSTI)

In isolated skeletal muscle arterioles, increasing transmural pressure causes an increase in constriction. This active myogenic response varies with age and fiber type. Increased transmural pressure activates both Ca2+-activated (KCa) potassium...

Kim, Se Jeong

2006-10-30T23:59:59.000Z

457

United States Environmental Protection Agency | Office of Radiation and Indoor Air (6608J) | EPA 402-F-07-010 | May 2007 WIPP: Planned Change Request for Magnesium Oxide (MgO)  

E-Print Network (OSTI)

402-F-07-010 | May 2007 WIPP: Planned Change Request for Magnesium Oxide (MgO) The U.S. Department Request for Magnesium Oxide." The document includes information regarding the detailed proposal

458

Potassium Rankine cycle nuclear power systems for spacecraft and lunar-mass surface power  

SciTech Connect

The potassium Rankine cycle has high potential for application to nuclear power systems for spacecraft and surface power on the moon and Mars. A substantial effort on the development of Rankine cycle space power systems was carried out in the 1960`s. That effort is summarized and the status of the technology today is presented. Space power systems coupling Rankine cycle power conversion to both the SP-100 reactor and thermionic reactors as a combined power cycle are described in the paper.

Holcomb, R.S.

1992-07-01T23:59:59.000Z

459

New P2 Compound with Brucite-Like Layers: Potassium Lithiostannate  

Science Journals Connector (OSTI)

New P2 Compound with Brucite-Like Layers: Potassium Lithiostannate ... A new compound with brucite-like layers (K0.72Li0.24Sn0.76O2) ... A new compound with brucite-like layers, K0.72Li0.24Sn0.76O2, has been obtained two ways, via solid-state reactions: with a big excess of KOH and in a controllable atmosphere without water and carbon dioxide. ...

Igor L. Shukaev; Vera V. Butova

2012-04-11T23:59:59.000Z

460

Salt index of potassium phosphate fertilizers and its relation to germination and early plant growth of field crops  

E-Print Network (OSTI)

SALT INDEX OF POTASSIUM PHOSPHATE FERTILIZERS AND ITS RELATION TO GERMINATION AND EARLY PLANT GROWTH OF FIELD CROPS A Thesis by JERRY ALLEN FREEOUF Submitted to the Graduate College of Texas A&M University in partial fulfillment... of the requirement for the degree of MASTER OF SCIENCE May 1975 Major Subject: Soil Chemistry SALT 1NDEX OF POTASSIUM PHOSPHATE FERTILIZERS AND ITS RELATION TO GERMINATION AND EARLY PLANT GROWTH OF FIELD CROPS A Thesis by JERRY ALLEN FREEOUF Approved...

Freeouf, Jerry Allen

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Synthesis, structures and properties of a series of manganese coordination complexes constructed from dicarboxylic fluorene derivatives  

SciTech Connect

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.

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

462

A green synthesis of a layered titanate, potassium lithium titanate; lower temperature solid-state reaction and improved materials performance  

SciTech Connect

A layered titanate, potassium lithium titanate, with the size range from 0.1 to 30 µm was prepared to show the effects of the particle size on the materials performance. The potassium lithium titanate was prepared by solid-state reaction as reported previously, where the reaction temperature was varied. The reported temperature for the titanate preparation was higher than 800 °C, though 600 °C is good enough to obtain single-phase potassium lithium titanate. The lower temperature synthesis is cost effective and the product exhibit better performance as photocatalysts due to surface reactivity. - Graphical abstract: Finite particle of a layered titanate, potassium lithium titanate, was prepared by solid-state reaction at lower temperature to show modified materials performance. Display Omitted - Highlights: • Potassium lithium titanate was prepared by solid-state reaction. • Lower temperature reaction resulted in smaller sized particles of titanate. • 600 °C was good enough to obtain single phased potassium lithium titanate. • The product exhibited better performance as photocatalyst.

Ogawa, Makoto, E-mail: waseda.ogawa@gmail.com [Graduate School of Creative Science and Engineering, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo 169-8050 (Japan); Department of Earth Sciences, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo 169-8050 (Japan); Morita, Masashi, E-mail: m-masashi@y.akane.waseda.jp [Graduate School of Creative Science and Engineering, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo 169-8050 (Japan); Igarashi, Shota, E-mail: uxei_yoshi_yoshi@yahoo.co.jp [Graduate School of Creative Science and Engineering, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo 169-8050 (Japan); Sato, Soh, E-mail: rookie_so_sleepy@yahoo.co.jp [Graduate School of Creative Science and Engineering, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo 169-8050 (Japan)

2013-10-15T23:59:59.000Z

463

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)

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

Yaghi, Omar M.

464

Laser cladding Al-Si/Al2O3-TiO2 composite coatings on AZ31B magnesium alloy  

Science Journals Connector (OSTI)

To improve the wear resistance and corrosion resistance of magnesium alloys, a 5 kW continuous wave CO2 laser was used to investigate the laser surface cladding on AZ31B magnesium alloys with Al-Si/...2O3 -TiO2.....

Zeqin Cui ???; Hongwei Yang…

2012-12-01T23:59:59.000Z

465

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

E-Print Network (OSTI)

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...

Holmes, Kathryn Ellen Hughes

1988-01-01T23:59:59.000Z

466

A Greenhouse-Scale Photosynthetic Microbial Bioreactor for Carbon Sequestration in Magnesium Carbonate Minerals  

Science Journals Connector (OSTI)

A Greenhouse-Scale Photosynthetic Microbial Bioreactor for Carbon Sequestration in Magnesium Carbonate Minerals ... The bioreactor was located in a greenhouse which maintained a minimum air temperature of 18 °C and received at least 14 h of light/day through combined natural and artificial lighting. ... We provide a detailed account of the natural process of carbon trapping and storage as it occurs at Clinton Creek and Cassiar, including mineralogy, modes of occurrence, methods of formation for carbonate alteration, light stable isotope geochem., and radiocarbon anal. ...

Jenine McCutcheon; Ian M. Power; Anna L. Harrison; Gregory M. Dipple; Gordon Southam

2014-07-29T23:59:59.000Z

467

Mon. Not. R. Astron. Soc. 000, 122 (2011) Printed 29 July 2011 (MN LATEX style file v2.2) A grid of NLTE corrections for magnesium and calcium in  

E-Print Network (OSTI)

of NLTE corrections for magnesium and calcium in late-type giant and supergiant stars: application to Gaia ?. Received ?; in original form ? ABSTRACT We investigate NLTE effects for magnesium and calcium the Galaxy. Calcium (Ca) and magnesium (Mg) are key elements for the understanding of these events since

Paris-Sud XI, Université de

468

JOURNAL DE PHYSIQUE Colloque C5, suppliment au no 5, Tome 40, Mai 1979, page C5-38 Magnetoresistance and anomalous Hall effect of magnesium singIe crystals  

E-Print Network (OSTI)

-38 Magnetoresistance and anomalous Hall effect of magnesium singIe crystals with heavy rare earth impurities J. Bijvoet splitting, the magnetization of rare earth ions in magnesium single crystals is anisotropic at low and cannot be explained by crystal field splitting of the 4f levels. Single crystals of magnesium with small

Paris-Sud XI, Université de

469

Manganese valence and coordination structure in Mn,Mg-codoped {gamma}-AlON green phosphor  

SciTech Connect

The valence and coordination structure of manganese in a Mn,Mg-codoped {gamma}-AlON spinel-type oxynitride green phosphor were studied by synchrotron X-ray diffraction and absorption fine structure measurements. The absorption edge position of the XANES revealed the bivalency of Mn. Two cation sites are available in the spinel structure for cation doping: a tetrahedral site and an octahedral site. The pre-edge of the XANES and the distance to the nearest neighbor atoms obtained from the EXAFS measurement showed that Mn was situated at the tetrahedral site. Rietveld analysis showed that the vacancy occupied the octahedral site. The preferential occupation of the tetrahedral site by Mn and the roles of N and Mg are discussed in relation to the spinel crystal structure. - Graphical Abstract: Fourier transform of EXAFS of Mn K-edge for Mn,Mg-codoped green phosphor and Mn coordination structure. Highlights: Black-Right-Pointing-Pointer Mn, Mg-codoped {gamma}-AlON green phosphor for white LED. Black-Right-Pointing-Pointer The valence of Mn is divalent. Black-Right-Pointing-Pointer Mn occupies the tetrahedral site in the spinel structure.

Takeda, Takashi, E-mail: TAKEDA.Takashi@nims.go.jp [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)] [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Xie, Rong-Jun; Hirosaki, Naoto [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)] [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Matsushita, Yoshitaka [National Institute for Materials Science (NIMS), NIMS-SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)] [National Institute for Materials Science (NIMS), NIMS-SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan); Honma, Tetuso [Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)] [Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)

2012-10-15T23:59:59.000Z

470

Atmospheric chemistry of methylcyclopentadienyl manganese tricarbonyl: Photolysis, reaction with hydroxyl radicals and ozone  

SciTech Connect

The atmospheric fate of MMT has been studied using laboratory smog chamber systems. MMT absorbs strongly in the UV-visible region from 210 to 400 nm with {sigma} (333 nm) = (1.9 {+-} 0.2) x 10{sup {minus}18} cm{sub 2} molecule{sup {minus}1} and undergoes photolysis at a rate estimated to be (1.3 {+-} 0.1) x 10{sup {minus}2} x{sup {minus}1} for a typical summer day at a latitude of 40{degree}N. Photolysis gives CO in a molar yield that is indistinguishable from 100% and an unidentified species believed to be methylcyclopentadienyl manganese dicarbonyl (MMD), which also undergoes rapid photolysis liberating additional CO. Reaction of MMT with OH and O{sub 3} proceeds rapidly with rate constants of k{sub OH} = (1.1 {+-} 0.3) x 10{sup {minus}10} and k{sub 0{sub 3}} = (7.7 {+-} 1.9) x 10{sup {minus}18} cm{sub 3} molecule{sup {minus}1} s{sup {minus}1}. During the day, the atmospheric loss of MMT proceeds essentially entirely via photolysis. At night reaction with O{sub 3} can be significant.

Wallington, T.J.; Sokolov, O.; Hurley, M.D.; Tyndall, G.S.; Orlando, J.J.; Barnes, I.; Becker, K.H.; Vogt, R.

1999-12-01T23:59:59.000Z

471

Lithium/Manganese Dioxide (Li/MnO(2)) Battery Performance Evaluation: Final Report  

SciTech Connect

In February 1997, under the auspices of the Product Realization Program, an initiative to develop performance models for lithium/manganese dioxide-based batteries began. As a part of this initiative, the performance characteristics of the cells under a variety of conditions were determined, both for model development and for model validation. As a direct result of this work, it became apparent that possible Defense Program (DP) uses for batteries based on this cell chemistry existed. A larger effort aimed at mapping the performance envelope of this chemistry was initiated in order to assess the practicality of this cell chemistry, not only for DP applications, but also for other uses. The work performed included an evaluation of the cell performance as a function of a number of variables, including cell size, manufacturer, current, pulse loads, constant current loads, safety, etc. In addition, the development of new evaluation techniques that would apply to any battery system, such as those related to reliability assessments began. This report describes the results of these evaluations.

Ingersoll, D.; Clark, N.H.

1999-04-01T23:59:59.000Z

472

Water balance analysis and wastewater recycling investigation in electrolytic manganese industry of China — A case study  

Science Journals Connector (OSTI)

Abstract A water balance investigation was performed for a representative electrolytic manganese metal (EMM) enterprise to study the details of water consumption and generation in the production process. A new integrated wastewater treatment approach was put forward to recover useful chemicals from the process wastewater, which contained high concentrations of Mn2 +, Cr(VI), Cr3 +, and NH4+. Cr(VI) was recovered from the wastewater by ion exchange techniques and reused as EMM passivant. The remaining wastewater containing Mn2 + and NH4+ was returned to the leaching section before the impurity removal procedure to prepare electrolytes. Complete wastewater recycling was achieved after water balance regulation and optimization. Final demonstration line results proved that the proposed process is feasible and exhibits significant advantages of better treatment effects, lower costs and lower environmental impact compared to the traditional reduction–neutralization–sedimentation treatment method. With the adoption of the proposed approach, solid waste disposal cost and the required area for the landfill yard were decreased by 80%. Operating costs for wastewater treatment were lowered by 85%. Around 4.8 kg/t EMM of Mn2 +, 5.2 kg/t EMM of NH4+ and 0.24 kg/t EMM of Cr(VI) were recovered. The recycled wastewater proportion was increased from 6.2% to 100.0%. 1.168 m3/t EMM of fresh water was saved and the equivalent amount of discharging wastewater was reduced to the environment.

Fuyuan Xu; Linhua Jiang; Zhigang Dan; Xiaojuan Gao; Ning Duan; Guimei Han; Hong Zhu

2014-01-01T23:59:59.000Z

473

Oxidation state of manganese in zinc pyrophosphate: Probed by luminescence and EPR studies  

SciTech Connect

Zn{sub 2}P{sub 2}O{sub 7}: Mn was synthesized by wet chemical route and characterized by X-ray diffraction (XRD), photoluminescence (PL) and electron paramagnetic resonance (EPR) techniques. Photoluminescence spectrum shows two bands, one at 500 nm (green emission), which is attributed to the {sup 4}T{sub 1}({sup 4}G)-{sup 6}A{sub 1}({sup 6}S) transition of Mn{sup 2+} and other centered at 686 nm (red emission) is attributed to the electronic transition between {sup 2}E and {sup 4}A{sub 2} of Mn{sup 4+} accompanied with vibronic transitions. EPR spectroscopic studies also confirmed the presence of both Mn2+ and Mn4+ ions in zinc pyrophosphate with difference in the number of fine transitions and g values (Mn{sub 4+}, S=3/2, three fine transitions and g < 2.00; Mn{sup 2+} S=5/2, five fine transitions and g=2.00).Mn{sup 2+} is attributed to presence of Mn at 6-ccordinated Zn{sup 2+} site whereas Mn{sup 4+} is due to presence substitution of Mn{sup 4+} at Zn{sup 2+} site thereby invoking charge compensation by presence of interstitial oxygen ions around Mn{sup 4+} ion or due to substitution of manganese at distorted 5-coordinated zinc site.

Gupta, Santosh K., E-mail: santoshg@barc.gov.in; Kadam, R. M., E-mail: santoshg@barc.gov.in; Natarajan, V., E-mail: santoshg@barc.gov.in; Godbole, S. V., E-mail: santoshg@barc.gov.in [Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)

2014-04-24T23:59:59.000Z

474

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

E-Print Network (OSTI)

TIIE EFFECT 0F A PR0L0NGED MAGNESIUM RESTRI CTI0N ON THE HUMORAL IMMUNE RESPONSE IN HATERHAL RATS AHD THEIR OFFSPRING A Thesis by DIANE T. COHILL Submitted to the Graduate College of Texas ASM University in Partial fulfillment... of the requirements for the degree of MASTER OF SC IENCE May 1987 Major Subject: Nutrition THE EFFECT OF A PROLONGED MAGNESIUM RESTRICTION ON THE HUMORAL IMMUNE RESPONSE IN MATERNAL RATS AND THEIR OFFSPRING A Thesis by DIANE T. COHILL Approved as to sty le...

Cohill, Diane T

2012-06-07T23:59:59.000Z

475

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

E-Print Network (OSTI)

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...

Conboy-Downs, Jean

2012-06-07T23:59:59.000Z

476

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

E-Print Network (OSTI)

of hone is (plant Ltntivc Jy expl essed as lr~ &3 p0/ )2]3 ~ CnOOq. Other su ncrals besides calcium mhich are present in bone are phosphorus, magnesium' odium, chlorine and fluorine. The skeletal system is the main. depot for calcium, phosphorus...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...

Haque, Mozammel

2012-06-07T23:59:59.000Z

477

Manufacture of gradient micro-structures of magnesium alloys using two stage extrusion dies  

SciTech Connect

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.

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

478

Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide  

SciTech Connect

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.

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

479

Tunable hydrogen storage in magnesium–transition metal compounds: First-principles calculations  

Science Journals Connector (OSTI)

Magnesium dihydride (MgH2) stores 7.7?wt?% hydrogen but it suffers from a high thermodynamic stability and slow (de)hydrogenation kinetics. Alloying Mg with lightweight transition metals (TM) (=Sc,Ti,V,Cr) aims at improving the thermodynamic and kinetic properties. We study the structure and stability of MgxTM1?xH2 compounds, x=[0–1], by first-principles calculations at the level of density functional theory. We find that the experimentally observed sharp decrease in hydrogenation rates for x?0.8 correlates with a phase transition of MgxTM1?xH2 from a fluorite to a rutile phase. The stability of these compounds decreases along the series Sc, Ti, V, and Cr. Varying the TM and the composition x, the formation enthalpy of MgxTM1?xH2 can be tuned over the substantial range of 0–2 eV/f.u. Assuming however that the alloy MgxTM1?x does not decompose upon dehydrogenation, the enthalpy associated with reversible hydrogenation of compounds with a high magnesium content (x=0.75) is close to that of pure Mg.

Süleyman Er; Dhirendra Tiwari; Gilles A. de Wijs; Geert Brocks

2009-01-09T23:59:59.000Z

480

Experimental investigation of anisotropy evolution of AZ31 magnesium alloy sheets under tensile loading  

SciTech Connect

Increasing demand for lighter final products has created new opportunities for the application of new light weight materials. Due to high strength to density ratio and good magnetic resistance properties, magnesium alloys are good candidates to replace steel and aluminum for same application. However, limited numbers of active slip deformation mechanisms, result in a decreased formability at room temperature. Furthermore, wrought magnesium alloys have an initial crystallographic texture, remained from the prior rolling operations, which makes them highly anisotropic. In this paper, tensile tests are performed at room temperature and 200 deg. C at different strain rates and orientations relative to the rolling direction, including rolling, 30 deg., 45 deg., 60 deg. and transverse orientation. The strain rates adopted for these experiments varied from 0.001 to 1.0. The testing results show the effect of temperature on the strain rate sensitivity of AZ31 sheets. The extent of deformation is continuously recorded using two separate high temperature extensometers. The results of testing show an increase in the r-values with the plastic deformation. The strain rate sensitivity of AZ31 increased as the temperature was elevated. At higher strain rates the measured r-values are larger and the slope of its evolution with the plastic strain is steeper.

Tari, D. Ghaffari; Worswick, M. J. [University of Waterloo, 200 University Ave West, Waterloo, Ontario (Canada)

2011-05-04T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

EBSD analysis of magnesium addition on inclusion formation in SS400 structural steel  

SciTech Connect

In this study, the effect of magnesium addition on the inclusion formation in SS400 steel was investigated. The experimental specimens with and without Mg addition treatment were compared. The microstructure was observed using optical microscopy after etching with 3% nital. The morphology and chemical composition of the inclusions were analyzed via scanning electron microscopy and energy dispersive spectrometry. The lattice structure and orientation of the inclusions were identified by electron backscattering diffraction. The average size of inclusions in SS400 was between 0.67 and 0.75 ?m, and between 0.65 and 0.68 ?m in SS400 + Mg. The 2 ppm Mg addition resulted in the oxide formation change from Al{sub 2}O{sub 3} to MgO·Al{sub 2}O{sub 3} and in the inclusion formation change from Al{sub 2}O{sub 3}–MnS to MgO·Al{sub 2}O{sub 3}–MnS. Moreover, a simple-phase MnS with an average grain size of 1 ?m to 2 ?m was observed in rod-like, globular, and polyhedron forms. - Highlights: • The effect of magnesium addition was investigated for SS400 steel. • 2 ppm Mg addition changes the inclusion formation from Al2O3-MnS to MgO·Al2O3-MnS. • MnS observed in inclusions exhibits rod-like, globular, and polyhedron forms.

Luo, Sin-Jie [Department of Materials Science and Engineering, National Cheng-Kung University, No. 1, University Road, Tainan 701, Taiwan (China); Su, Yen-Hao Frank; Lu, Muh-Jung [China Steel Corporation, Kaohsiung 81233, Taiwan (China); Kuo, Jui-Chao, E-mail: jckuo@mail.ncku.edu.tw [Department of Materials Science and Engineering, National Cheng-Kung University, No. 1, University Road, Tainan 701, Taiwan (China)

2013-08-15T23:59:59.000Z

482

A Compiled Catalogue of Spectroscopically Determined Elemental Abundances for Stars with Accurate Parallaxes. I.Magnesium  

E-Print Network (OSTI)

We present a compiled catalogue of effective temperatures, surface gravities, iron and magnesium abundances, distances, velocity components, and orbital elements for stars in the solar neighborhood. The atmospheric parameters and iron abundances are averages of published values derived from model synthetic spectra for a total of about 2000 values in 80 publications. Our relative magnesium abundances were found from 1412 values in 31 publications for 876 dwarfs and subgiants using a three-step iteration averaging procedure, with weights assigned to each source of data as well as to each individual determination and taking into account systematic deviations of each scale relative to the reduced mean scale. The estimated assumed completeness for data sources containing more than five stars, up to late December 2003, exceeds 90%. For the vast majority of stars in the catalogue, the spatial velocity components were derived from modern high-precision astrometric observations, and their Galactic orbit elements were computed using a three-component model of the Galaxy, consisting of a disk, a bulge, and a massive extended halo.

T. V. Borkova; V. A. Marsakov

2005-03-28T23:59:59.000Z

483

Friction Stir Lap Welding of Magnesium Alloy to Steel: A Preliminary Investigation  

SciTech Connect

An initial study was made to evaluate the feasibility of joining Magnesium alloy AZ31 sheet to galvanized steel sheet in lap configuration using friction stir welding (FSW). Two different automotive sheet steels were used for comparative evaluation of the dissimilar joining potential; a 0.8mm thick, electro galvanized (EG) mild steel, and a 1.5mm thick hot dipped galvanized (HDG) high-strength, low-alloy steel (HSLA). These steels were joined to 2.33mm thick AZ31B magnesium sheet. A single FSW tool design was used for both dissimilar welds, and process parameters were kept the same. Average peak load for the AZ31-1.5 mm steel weld joint in lap shear mode was found to be 6.3 ± 1.0 kN. For the AZ31-0.8 mm steel weld, joint strength was 5.1 ± 1.5 kN. Microstructural investigation indicates melting of the Zn coating at the interface and subsequent alloying with the Mg sheet resulting in formation of solidified Zn-Mg alloy layer at AZ31/steel interface.

Jana, Saumyadeep; Hovanski, Yuri; Grant, Glenn J.

2010-12-01T23:59:59.000Z

484

Structure-dielectric properties relationships in copper-substituted magnesium ferrites  

SciTech Connect

Graphical abstract: - Highlights: • Synthesis of copper substituted magnesium ferrites materials is reported. • A shift from cubic to tetragonal structure starting with x = 0.84 was observed. • The dielectric properties are influenced by Cu-substitution. - Abstract: Nanocrystalline powders of copper-substituted magnesium ferrites with general formula Mg{sub 1?x}Cu{sub x}Fe{sub 2}O{sub 4} (x = 0.00, 0.17, 0.34, 0.50, 0.67, 0.84, 1.00) were prepared for the first time by sol–gel auto-combustion method, using glycine as fuel agent. Solid phase chemical reactions and the occurrence of spinel structure were monitored by using infrared spectroscopy. X-ray diffraction analysis confirmed the spinel single-phase formation. A shift from cubic structure to tetragonal structure starting with x = 0.84 was also observed. Microstructure of the samples was analyzed by scanning electron microscopy and particle size was estimated from the micrographs. Analysis of dielectric properties revealed very low values of dielectric loss at frequencies over 10 MHz.

Druc, A.C.; Borhan, A.I. [Faculty of Chemistry, Alexandru Ioan Cuza University of Iasi, Bulevardul Carol I, nr. 11, 700506 Iasi (Romania); Nedelcu, G.G.; Leontie, L. [Faculty of Physics, Alexandru Ioan Cuza University of Iasi, Bulevardul Carol I, nr. 11, 700506 Iasi (Romania); Iordan, A.R. [Faculty of Chemistry, Alexandru Ioan Cuza University of Iasi, Bulevardul Carol I, nr. 11, 700506 Iasi (Romania); Palamaru, M.N., E-mail: palamaru@uaic.ro [Faculty of Chemistry, Alexandru Ioan Cuza University of Iasi, Bulevardul Carol I, nr. 11, 700506 Iasi (Romania)

2013-11-15T23:59:59.000Z

485

Identification of an advanced constitutive model of Magnesium alloy AZ31B  

SciTech Connect

The main aim of this paper is to study the flow behavior of the AZ31B magnesium alloy by means of tensile tests performed in extended ranges of temperature and strain rates. The flow stress-strain curves analyzed by power law type constitutive equation can only fit well with experimental curves at the work-hardening stage. A new mathematical model is studied to describe the softening behavior of material based on tensile experiments. The relative parameters are obtained by fitting the equation with the experimental data. The genetic algorithm has been used to obtain the global optimal fitting parameters. The comparison between the fitted and experimental data proves the effectiveness of the model. The results indicate that this model leads to a better simulation of the flow stress during the softening stage than that of the power law equation. Based on this model, the deep drawing process has been simulated with the commercial finite element code FORGE registered. The punch load and thickness distribution of AZ31 sheet have been studied. The study of the results is helpful to the application of the stamping technology for the magnesium alloy sheet.

Liu, Z. G.; Massoni, E. [CEMEF, Centre de Mise en Forme des Materiaux, Ecole Nationale Superieure des Mines de Paris 1, rue Claude Daunesse, BP 207, 06904, Sophia-Antipolis Cedex (France)

2011-05-04T23:59:59.000Z

486

Optimized deposition and characterization of nanocrystalline magnesium indium oxide thin films for opto-electronic applications  

Science Journals Connector (OSTI)

Transparent conducting magnesium indium oxide films (MgIn2O4) were deposited on to quartz substrates without a buffer layer at an optimized deposition temperature of 450 °C to achieve high transmittance in the visible spectral range and electrical conductivity in the low temperature region. Magnesium ions are distributed over the tetrahedral and octahedral sites of the inverted spinel structure with preferential orientation along (3 1 1) Miller plane. The possible mechanism that promotes conductivity in this system is the charge transfer between the resident divalent (Mg2+) and trivalent (In3+) cations in addition to the available oxygen vacancies in the lattice. A room temperature electrical conductivity of 1.5 × 10?5 S cm?1 and an average transmittance >75% have been achieved. Hall measurements showed n-type conductivity with electron mobility value 0.95 × 10?2 cm2 V?1 s?1 and carrier concentration 2.7 × 1019 cm?3. Smoothness of the film surface observed through atomic force microscope measurements favors this material for gas sensing and opto-electronic device development.

A. Moses Ezhil Raj; C. Ravidhas; R. Ravishankar; A. Rathish Kumar; G. Selvan; M. Jayachandran; C. Sanjeeviraja

2009-01-01T23:59:59.000Z

487

Magnesium in the atmosphere of the planet HD209458b: Observations of the thermosphere-exosphere transition region  

E-Print Network (OSTI)

We report new near ultraviolet HST/STIS observations of atmospheric absorptions during the planetary transit of HD209458b. We detect absorption in atomic magnesium (MgI), while no signal has been detected in the lines of singly ionized magnesium (MgII). We measure the MgI atmospheric absorption to be 6.2+/-2.9% in the velocity range from -62 to -19 km/s. The detection of atomic magnesium in the planetary upper atmosphere at a distance of several planetary radii gives a first view into the transition region between the thermosphere and the exobase, where atmospheric escape takes place. We estimate the electronic densities needed to compensate for the photo-ionization by dielectronic recombination of Mg+ to be in the range of 10^8-10^9 cm^{-3}. Our finding is in excellent agreement with model predictions at altitudes of several planetary radii. We observe MgI atoms escaping the planet, with a maximum radial velocity (in the stellar rest frame) of -60 km/s. Because magnesium is much heavier than hydrogen, the es...

Vidal-Madjar, A; Bourrier, V; Désert, J -M; Ballester, G; Etangs, A Lecavelier des; Sing, D K; Ehrenreich, D; Ferlet, R; Hébrard, G; McConnell, J C

2013-01-01T23:59:59.000Z

488

Density Functional Theory Simulations Predict New Materials for Magnesium-Ion Batteries (Fact Sheet), NREL Highlights, Science  

SciTech Connect

Multivalence is identified in the light element, B, through structure morphology. Boron sheets exhibit highly versatile valence, and the layered boron materials may hold the promise of a high-energy-density magnesium-ion battery. Practically, boron is superior to previously known multivalence materials, especially transition metal compounds, which are heavy, expensive, and often not benign. Based on density functional theory simulations, researchers at the National Renewable Energy Laboratory (NREL) have predicted a series of stable magnesium borides, MgB{sub x}, with a broad range of stoichiometries, 2 < x < 16, by removing magnesium atoms from MgB{sub 2}. The layered boron structures are preserved through an in-plane topological transformation between the hexagonal lattice domains and the triangular domains. The process can be reversibly switched as the charge transfer changes with Mg insertion/extraction. The mechanism of such a charge-driven transformation originates from the versatile valence state of boron in its planar form. The discovery of these new physical phenomena suggests the design of a high-capacity magnesium-boron battery with theoretical energy density 876 mAh/g and 1550 Wh/L.

Not Available

2011-10-01T23:59:59.000Z

489

Neutron and X-ray diffraction and empirical potential structure refinement modelling of magnesium stabilised amorphous calcium  

E-Print Network (OSTI)

Neutron and X-ray diffraction and empirical potential structure refinement modelling of magnesium online xxxx Keywords: Amorphous calcium carbonate; EPSR modelling; Neutron diffraction; X-ray diffraction Amorphous calcium carbonate (ACC) plays a key role in biomineralisation processes in sea organisms. Neutron

Benning, Liane G.

490

Evaluation of iron- and manganese-based mono- and mixed-metallic oxygen carriers for chemical looping combustion  

Science Journals Connector (OSTI)

Abstract Chemical looping combustion (CLC) is an emerging technology for clean combustion of fossil fuels with inherent CO2 capture. In the present work, we investigate the use of iron and manganese based mixed oxides (MnxFe1?x–CeO2) supported on CeO2 as oxygen carriers in CLC. The low cost and low toxicity of iron and manganese make them interesting candidates for CLC, but both mono-metallic carriers suffer from issues of low reactivity, and manganese is additionally prone to form undesired spinel structures with typical oxide supports. Mono- and bimetallic oxygen carriers were synthesized across the entire spectrum of compositions from pure Mn to pure Fe (with x = 0, 0.1, 0.33, 0.5, 0.8, 0.9, 1), characterized, and tested in thermogravimetric and fixed-bed reactor studies using H2 and CH4 as fuels. We find that the use of ceria as support results in stable operation for all compositions of the metal phase, including pure Mn. Bimetallic carriers with high Fe content, which contain a FeMnO3 phase, exhibit an unusual, reversible de-alloying/re-alloying behavior during cyclic redox operation, which precludes any synergistic effects between the two metals and results in slowed reduction kinetics. However, Mn-rich carriers show a pronounced increase in carrier reactivity and selectivity for total oxidation of methane due to the addition of small amounts of Fe, indicating the promise of appropriately designed FeMn carriers as low-cost, environmentally benign oxygen carrier materials for chemical looping combustion.

Saurabh Bhavsar; Brian Tackett; Götz Veser

2014-01-01T23:59:59.000Z

491

Spatially resolved characterization of biogenic manganese oxideproduction within a bacterial biofilm  

SciTech Connect

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.

Toner, Brandy; Fakra, Sirine; Villalobos, Mario; Warwick, Tony; Sposito, Garrison

2004-10-01T23:59:59.000Z

492

Manganese-loaded lipid-micellar theranostics for simultaneous drug and gene delivery to lungs  

Science Journals Connector (OSTI)

Abstract Gadolinium (Gd) contrast agents are predominantly used for T1 MR imaging. However, the high toxicity of Gd3 + and potential side effects including nephrogenic systemic fibrosis have led to the search for alternative T1 contrast agents. Since manganese (Mn) has paramagnetic properties with five unpaired electrons that permit high spin number, long electronic relaxation times, and labile water exchange, we evaluated Mn as a T1 magnetic resonance imaging (MRI) contrast agent for lung imaging. Here we report on the design and synthesis of multifunctional lipid-micellar nanoparticles (LMNs) containing Mn oxide (M-LMNs) for MRI that can also be used for DNA and drug delivery. Oleic acid-coated MnO nanoparticles were encapsulated in micelles composed of polyethylene glycol (PEG-2000), phosphatidylethanolamine (PE), DC-cholesterol, and dioleoyl-phosphatidylethanolamine (DOPE). The particles are taken up in vitro by human embryonic kidney (HEK293), Lewis lung carcinoma (LLC1), and A549 cells and are devoid of cytotoxicity. When administered to mice intranasally, they preferentially accumulate in the lungs. In vitro phantom and ex vivo lung MRI results confirmed that M-LMNs are able to enhance T1 MRI contrast. M-LMNs loaded with plasmid DNA and/or doxorubicin are efficiently taken up by HEK293 cells in vitro and by target cells in vivo. Taken together, these results demonstrate that M-LMNs are capable of simultaneously providing MRI contrast and DNA and/or drug delivery to target cells in the lung and therefore may prove useful as a lung theranostic, especially for lung cancers.

M. Howell; J. Mallela; C. Wang; S. Ravi; S. Dixit; U. Garapati; S. Mohapatra

2013-01-01T23:59:59.000Z

493

Magnesium Projects  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

bounds MSF upper bounds Strain Amplitude Cycles to Failure Mississippi State U, Brian Jordan etal Multi-stage Fatigue Model Prediction compared with experimental results for...

494

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)

(~Or za sativa L. ) GROWN UNDER ANAEROBIC CONDITIONS A Thesis by RICHARD E. BACHA Approved as to style and content by: Chairman of Committee Head of Department 0 ember em er December 1976 g+g TO, I ABSTRACT Effects of Iron and Manganese... EFFECTS OF IRON AND MANGANESE IN CULTURE SOLUTION ON THEIR CONCENTRATIONS IN ROOTS AND SHOOTS OF RICE PLANTS (~Or za sativa L. ) GROWN UNDER ANAEROBIC CONDITIONS A Thesis by RICHARD E. BACHA Submitted to the Graduate College of Texas ASM Un...

Bacha, Richard E

1976-01-01T23:59:59.000Z

495

Solidification, growth mechanisms, and associated properties of Al-Si and magnesium lightweight casting alloys  

SciTech Connect

Continually rising energy prices have inspired increased interest in weight reduction in the automotive and aerospace industries, opening the door for the widespread use and development of lightweight structural materials. Chief among these materials are cast Al-Si and magnesium-based alloys. Utilization of Al-Si alloys depends on obtaining a modified fibrous microstructure in lieu of the intrinsic flake structure, a process which is incompletely understood. The local solidification conditions, mechanisms, and tensile properties associated with the flake to fiber growth mode transition in Al-Si eutectic alloys are investigated here using bridgman type gradient-zone directional solidification. Resulting microstructures are examined through quantitative image analysis of two-dimensional sections and observation of deep-etched sections showing three-dimensional microstructural features. The transition was found to occur in two stages: an initial stage dominated by in-plane plate breakup and rod formation within the plane of the plate, and a second stage where the onset of out-of-plane silicon rod growth leads to the formation of an irregular fibrous structure. Several microstructural parameters were investigated in an attempt to quantify this transition, and it was found that the particle aspect ratio is effective in objectively identifying the onset and completion velocity of the flake to fiber transition. The appearance of intricate out-of-plane silicon instability formations was investigated by adapting a perturbed-interface stability analysis to the Al-Si system. Measurements of silicon equilibrium shape particles provided an estimate of the anisotropy of the solid Si/liquid Al-Si system and incorporation of this silicon anisotropy into the model was found to improve prediction of the instability length scale. Magnesium alloys share many of the benefits of Al-Si alloys, with the added benefit of a 1/3 lower density and increased machinability. Magnesium castings often contain additions of heavier elements, such as zinc, zirconium, and rare earth elements, which significantly improve high temperature performance. However, additions of these elements can lead to macrosegregational effects in castings, which are detectable by radiographic scans. The effect of these flow-line indications on alloy mechanical properties is not well quantified. An examination of these flow-line indications and their effects on mechanical properties in three magnesium-based casting alloys was performed here in order to determine the best practice for dealing with affected castings. Preliminary results suggest the flow-lines do not measurably impact bulk material properties. Three additional methods of characterizing three-dimensional material structures are also presented: a minimum spanning tree analysis is utilized to quantify local structure in Cu-Zr liquid phase simulations obtained from molecular dynamics; the radial distribution function is applied to directionally solidified Al-Si structures in an attempt to extract local spacing data; and the critical diameter measurement is also defined and applied to irregular eutectic Al-Si structures.

Hosch, Timothy

2010-05-16T23:59:59.000Z

496

Overview of DOE'S programs on aluminum and magnesium for automotive application  

SciTech Connect

The U.S. Department of Energy will present an update and review of its programs in aluminum and magnesium for automotive and heavy-duty vehicle applications. While the main programs focused on vehicle materials are in the Office of Transportation Technologies, contributing efforts will be described in the DOE Office of Industrial Technologies and the DOE Office of Energy Research. The presentation will discuss materials for body/chassis and power train, and will highlight the considerable synergy among the efforts. The bulk of the effort is on castings, sheet, and alloys with a smaller focus on metal matrix composites. Cost reduction and energy savings are the overriding themes of the programs.

Carpenter, J.; Diamond, S.; Dillich, S.; Fitzsimmons, T.; Milliken, J.; Sklad, P.

1999-02-28T23:59:59.000Z

497

Multiphoton Ionization of Magnesium in a Ti-Sapphire laser field  

E-Print Network (OSTI)

In this paper we report the theoretical results obtained for partial ionization yields and the above-threshold ionization (ATI) spectra of Magnesium in a Ti:sapphire laser field (804 nm) in the range of short pulse duration (20-120 fs). Ionization yield, with linearly polarized light for a 120 fs laser pulse, is obtained as a function of the peak intensity motivated by recent experimental data \\cite{gillen:2001}. For this, we have solved the time-dependent Schr\\"{o}dinger equation nonperturbatively on a basis of discretized states obtained with two different methods; one with the two-electron wavefunction relaxed at the boundaries, giving a quadratic discretized basis and the other with the two-electron wavefunction expanded in terms of Mg$^+$-orbitals plus one free electron allowing the handling of multiple continua (open channels). Results, obtained with the two methods, are compared and advantages and disadvantages of the open-channel method are discussed.

Nikolopoulos, L A A; Lambropoulos, P; 10.1140/epjd/e2003-00265-7

2013-01-01T23:59:59.000Z

498

The effect of magnesium added at C{sub 60}/Rubrene heterointerfaces  

SciTech Connect

This study examines the effect of adding magnesium (Mg) at C{sub 60}/rubrene heterointerfaces by using synchrotron-radiation photoemission spectroscopy. The heterointerface was obtained by depositing C{sub 60} on a 4-Å Mg/rubrene surface. The photoemission spectra showed that the added Mg preferentially interacts with and transfers negative charges to C{sub 60}. The interfacial dipole potential was significantly enlarged, as was the separation between the lowest unoccupied molecular orbital of C{sub 60} and the highest occupied molecular orbital of rubrene. The results demonstrate that the addition of Mg should be an effective method for improving the efficiency of light- and current-generating devices.

Cheng, Chiu-Ping; Lee, Cheng-Wei; Chu, Yu-Ya [Department of Electrophysics, National Chiayi University, Chiayi 60004, Taiwan (China)] [Department of Electrophysics, National Chiayi University, Chiayi 60004, Taiwan (China); Wei, Ching-Hsuan [Department of Material Science, National Chiao-Tung University, Hsinchu 30076, Taiwan (China)] [Department of Material Science, National Chiao-Tung University, Hsinchu 30076, Taiwan (China); Pi, Tun-Wen [National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan (China)] [National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan (China)

2013-12-28T23:59:59.000Z

499

Punchless Drawing of Magnesium Alloy Sheet under Cold Condition and its Computation  

SciTech Connect

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.

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

500

Ab initio calculations on magnetism induced by composite defects in magnesium oxide  

SciTech Connect

The local magnetic state induced by the composite defects, composed of an oxygen vacancy and a nitrogen substituting oxygen, in magnesium oxide has been studied by using ab initio calculation based on density functional theory. The calculated results show that local magnetic moment can be induced by the composite defects around the oxygen vacancy, when the exchange split of the oxygen vacancy is enhanced either by the hybridization between the N-p and nearest neighbor O-p orbitals or by applying on-site Coulomb repulsion (U) and exchange interaction (J). We show that the magnetic state induced by the composite defect is energetically more stable than the non-magnetic state. In addition, we show that the U and J applied on the p-orbitals of N and O atoms may significantly impact the calculated magnetic state of the composite defect, resulting in magnetic state for a configuration that is non-magnetic by generalized gradient approximation.

Zhang, Yao-Fang [Department of Physics, Tianjin Polytechnic University, Tianjin 300384 (China); College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071 (China); Feng, Min [School of Physics, Nankai University, Tianjin 300071 (China); Shao, Bin [Department of Physics, Tsinghua University, Beijing 100084 (China); Lu, Yuan; Zuo, Xu, E-mail: xzuonku@gmail.com [College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071 (China); Liu, Hong [Office of International Academic Exchanges, Nankai University, Tianjin 300071 (China)

2014-05-07T23:59:59.000Z