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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/manganese dioxide electrochemical cell  

SciTech Connect

This patent describes an improvement in a magnesium/manganese dioxide electrochemical cell that has been stored following partial usage and including an alloy of magnesium as the anode, a moist cathode mix of carbon black, manganese dioxide, magnesium hydroxide, barium chromate and lithium chromate as the cathode, and 3.5 to 4.0 normal magnesium perchlorate as the electrolyte. The improvement involves increasing the moisture content of the cathode mix from 34 to 38 percent at the time of making the cell to reduce the self discharge and increase the operating capacity after the cell has been stored following partial usage.

Jarvis, L.P.; Brundage, M.T.; Atwater, T.B.

1989-09-26T23:59:59.000Z

2

Improved magnesium/manganese dioxide electrochemical cell  

SciTech Connect

A magnesium/manganese dioxide electrochemical cell, stored following partial usage, is improved by increasing the cathode moisture content at the time of making the cell to reduce the self-discharge and increase the operating capacity after the cell has been stored following partial usage.

Jarvis, L.P.; Brundage, M.T.; Atwater, T.B.

1988-11-10T23:59:59.000Z

3

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

Science Conference Proceedings (OSTI)

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 ({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

4

Potassium, calcium, and magnesium in the tropics and subtropics  

SciTech Connect

The potential for increased food production in the world is undoubtedly greater than even the most optimistic surveys predict. Proper use of adequate amounts of potassium, calcium, and magnesium in fertilizers, soil amendments, crop residues and other byproducts, and minerals will be necessary if crop production potentials are to be realized. Use of these three plant nutrients with others will be an increasingly important part of the exploitation of natural resources as new lands of the tropics and subtropics are brought into production. Most of the increase in food production will come from more intensive use of lands already in production, however, and the soils of these lands will need larger amounts of all plant nutrients if high yields are to be reached and maintained. This report is intended to point out some of the complexities of the soil and fertilizer problems involving potassium, calcium, and magnesium. It is hoped that the information it contains will be helpful in the research, education, and development that will be required to point the way to increased food and crop production on soils of the tropics and subtropics throughout the world.

Munson, R.D.

1982-01-01T23:59:59.000Z

5

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

6

Electrochemical corrosion of iron-magnesium-alumina spinel (FMAS) in molten potassium salts and coal slag  

DOE Green Energy (OSTI)

Iron, magnesium-alumina spinel (FMAS) (0.25 Fe/sub 3/O/sub 4/ . 0.75 MgAl/sub 2/O/sub 4/) has been considered for use as an electrode in magnetohydrodynamic (MHD) generator channels. Predominantly an electronic conductor, FMAS has adequate electrical conductivity (>1 S/m) above 520/sup 0/K. In addition, FMAS can be easily fabricated into a form and sintered in air to >90% theoretical density and has a melting point of 2124 +- 20/sup 0/K. Laboratory tests to measure both the electrochemical and chemical corrosion of FMAS in molten K/sub 2/CO/sub 3/, K/sub 2/SO/sub 4/ and coal slags were developed at the Pacific Northwest Laboratory to evaluate the relative corrosion of FMAS. Under isothermal conditions, a direct electric current was passed between an anode and a cathode through a molten electrolyte. The molten coal slags were synthetic high-calcium, low-iron Montana Rosebud and low-calcium, high-iron Illinois No. 6. Evaluations of electrochemical corrosion were made as functions of current density, temperature, and slag composition. These results were compared to those of FMAS tested without electric current. The corrosion rates and reaction products were investigated by optical microscopy and scanning electron microscopy. Overall, FMAS has too-high an electrochemical corrosion rate to be considered as MHD electrodes in Montana Rosebud coal slag or in systems where only molten potassium salts are present. However, FMAS may be considered for use in high-iron coal slags although the corrosion rates are still quite high even in these slags.

Marchant, D.D.; Griffin, C.W.; Bates, J.L.

1981-01-01T23:59:59.000Z

7

Specific Molecular Features of Potassium-Containing Cryolite Melts  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

8

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium ...  

Science Conference Proceedings (OSTI)

Presentation Title, Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride. Author(s) ...

9

Multivitamin/Multielement Dietary Supplement SRM  

Science Conference Proceedings (OSTI)

... chromium, copper, iodine, iron, magnesium, manganese, molybdenum, nickel, phosphorous, potassium, selenium, silicon, tin, vanadium, and zinc. ...

2012-10-22T23:59:59.000Z

10

NIST Tech Beat - Oct. 12, 2006  

Science Conference Proceedings (OSTI)

... iron, magnesium, manganese, sodium, potassium, zinc, arsenic cadmium, chromium, cobalt, copper, mercury, molybdenum, nickel, lead and ...

11

SEPARATING PROTOACTINIUM WITH MANGANESE DIOXIDE  

DOE Patents (OSTI)

The preparation of U/sup 235/ and an improved method for isolating Pa/ sup 233/ from foreign products present in neutronirradiated thorium is described. The method comprises forming a solution of neutron-irradiated thorium together with a manganous salt, then adding potassium permanganate to precipitate the manganese as manganese dioxide whereby protoactinium is carried down with the nnanganese dioxide dissolving the precipitate, adding a soluble zirconium salt, and adding phosphate ion to precipitate zirconium phosphate whereby protoactinium is then carried down with the zirconium phosphate to effect a further concentration.

Seaborg, G.T.; Gofman, J.W.; Stoughton, R.W.

1958-04-22T23:59:59.000Z

12

Production of magnesium metal  

DOE Patents (OSTI)

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

2010-02-23T23:59:59.000Z

13

Magnesium Technology 2009  

Science Conference Proceedings (OSTI)

Feb 1, 2009 ... Print Book and CD-ROM: Magnesium Technology 2007. Hardcover book and CD set: Magnesium Technology 2008 ...

14

Production of magnesium metal  

DOE Patents (OSTI)

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

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

2012-04-10T23:59:59.000Z

15

Magnesium Electrolytic Production Process  

Science Conference Proceedings (OSTI)

Oct 1, 1999 ... The process is adopted at magnesium and titanium-magnesium plants of Russia, Kazakhstan, Ukraine. The best modern projects are realised ...

16

Magnesium: Digital Resource Center - BOOK: Magnesium ...  

Science Conference Proceedings (OSTI)

Oct 6, 2008 ... This book presents all aspects of magnesium production, properties and application, including primary production, alloy development, ...

17

Potassium (K)  

Science Conference Proceedings (OSTI)

Table 33   Electron binding energies of potassium...Table 33 Electron binding energies of potassium Shell Electron configuration Binding energy, eV K 1 s 3608.4 L(I) 2 s 378.6 L(II) 2 p 1/2 297.3 L(III) 2 p 3/2 294.6 M(I) 3 s 34.8 M(II) 3 p 1/2 18.3 M(III) 3 p 3/2 18.3 Source: Ref 300...

18

Magnesium Technology 2014  

Science Conference Proceedings (OSTI)

Jul 15, 2013 ... Emerging Applications (hydrogen storage, additive manufacturing of ... with an electrolytic process for magnesium production from serpentine.

19

Magnesium Technology Symposium  

Science Conference Proceedings (OSTI)

Conference Tools for Materials Science & Technology 2013 ... Scope, The magnesium technology symposium will cover a broad spectrum of theoretical and ...

20

Potassium Fluoride (KF)  

Science Conference Proceedings (OSTI)

Potassium Fluoride (KF), F 1 K 1 (l). ... PREVIOUS: December 1963, CURRENT: June 1969. Potassium Fluoride (KF), F 1 K 1 (l). ...

2013-03-22T23:59:59.000Z

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.


21

Potassium Fluoride (KF)  

Science Conference Proceedings (OSTI)

Potassium Fluoride (KF), F 1 K 1 (cr,l). Enthalpy ... PREVIOUS: CURRENT: June 1969. Potassium Fluoride (KF), F 1 K 1 (cr,l). Download ...

2013-03-22T23:59:59.000Z

22

The Magnesium Industry  

Science Conference Proceedings (OSTI)

...salt lakes (for example, the Great Salt Lake in Utah) or salt deposits as the raw material. Both magnesium and chlorine are produced.

23

Magnesium Technology 2011  

Science Conference Proceedings (OSTI)

Aug 2, 2010 ... Processing Aspects of Magnesium Alloy Stent Tube ... The Effect of Rare Earth Elements on the Texture and Formability of Asymmetrically ...

24

Recycling - Magnesium - TMS  

Science Conference Proceedings (OSTI)

Guidelines to assist in buying and selling of various types of Scrap. ... A cooperative effort between EPA and US magnesium industry to reduce emissions of SF6.

25

Magnesium Technology 2001  

Science Conference Proceedings (OSTI)

Inno\\ ative Vacuum Distillation for Magnesium Recjvcling ........................................... .................... 3 3. Tiunhrri ZJ711. A.irihr Li, "iicioniing .\\lei. '4 lfi-cd I'ii, mid ...

26

WEB RESOURCE: Gas Welding Magnesium  

Science Conference Proceedings (OSTI)

Sep 20, 2007 ... This webpage offers advice on gas welding of magnesium. Launch Site SOURCE: "Gas Welding Magnesium". Weldwell Corporate Website.

27

WEB RESOURCE: Magnesium Welding - Information Sources for ...  

Science Conference Proceedings (OSTI)

Sep 20, 2007 ... This web-based, magnesium welding resource is a compilation of: ... SOURCE: “ Magnesium Welding – Information Sources for Magnesium ...

28

Magnesium - Rare Earth Alloys  

Science Conference Proceedings (OSTI)

Feb 16, 2010 ... Location: Washington State Convention Center ... The Use of Computer Modeling for Producing DC Cast WE43 Magnesium Alloy Slab: ... However, there is a limited operating window within which favourable textures arise.

29

ASM Specialty Handbook: Magnesium and Magnesium Alloys - TMS  

Science Conference Proceedings (OSTI)

Feb 9, 2007 ... Prepared with the cooperation of the International Magnesium Association, this handbook presents current industrial practices and provides ...

30

Improving the Performance of Lithium Manganese Phosphate  

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

Improving the Performance of Lithium Manganese Phosphate Title Improving the Performance of Lithium Manganese Phosphate Publication Type Journal Article Year of Publication 2009...

31

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

32

Molten Salts, Magnesium and Aluminum  

Science Conference Proceedings (OSTI)

Mar 1, 2011 ... Chloride 2011: Practice and Theory of Chloride-Based Metallurgy: Molten Salts, Magnesium and Aluminum Sponsored by: The Minerals, ...

33

Magnesium Workshop Madrid 2013: Home Page  

Science Conference Proceedings (OSTI)

Magnesium Workshop Madrid 2013. An International Workshop on Processing- Microstructure-Mechanical Property of Magnesium Alloys May 21-24, 2013 ...

34

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

Office of Scientific and Technical Information (OSTI)

in 1943, the mission of the International Magnesium Association (IMA) is to promote the use of the metal magnesium in material selection and encourage innovative applications of...

35

Promising Magnesium Battery Research at ALS  

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

AdvancedLightSource Home Science Highlights Industry @ ALS Promising Magnesium Battery Research at ALS Promising Magnesium Battery Research at ALS Print Wednesday, 23...

36

The Magnesium Industry Today: A Global Perspective  

Science Conference Proceedings (OSTI)

World demand for magnesium continues to remain subdued, succumbing to the ... Magnesium Alloy Sheets and Lubricants for Warm-Forming - Friction Effects.

37

Iron and manganese removal from a groundwater supply  

SciTech Connect

The treatment options and planning techniques used by the town of Castle Rock (Colorado) for a new water treatment facility are described. Castle Rock officials assessed the available treatment options for dissolved iron and manganese removal and selected potassium permanganate as the primary oxidant to be followed by manganese greensand. A backup prechlorination system for oxidation was also installed. In addition, to prevent excess headloss buildup in the manganese greensand filter media, an anthracite carbon cap was used as the top filter medium for precipitate removal. It is recommended that a treatability study be performed to determine individual design criteria to allow for specific site conditions. The town also assessed the capital and operation and maintenance costs for both treatment at individual well fields and a centralized location for treatment of a cluster of well fields. The results indicate that it is more economical to provide centralized water treatment even though there are capital costs associated with piping raw water from the individual well fields to the central facility. 3 refs.

Lorenz, W.; Seifert, K.; Kasch, O.K. (Arber Richard P. Associates, Inc., Denver, CO (USA))

1988-11-01T23:59:59.000Z

38

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.

39

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

40

Magnesium: Digital Resource Center - ARTICLE: Safe Machining of ...  

Science Conference Proceedings (OSTI)

Sep 7, 2007... Other ==== Miscellaneous Digital Resources in Magnesium. Spacer ... Topic Title: ARTICLE: Safe Machining of Magnesium Parts by Cutting ...

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

Slashing Greenhouse Emissions from Magnesium Production - TMS  

Science Conference Proceedings (OSTI)

Jul 1, 2008 ... Topic Title: Slashing Greenhouse Emissions from Magnesium Production Topic Summary: CSIRO, an Australia's national science agency ...

42

Synthesis of superconducting magnesium diboride objects  

DOE Patents (OSTI)

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

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

2003-08-15T23:59:59.000Z

43

Synthesis Of Superconducting Magnesium Diboride Objects.  

DOE Patents (OSTI)

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

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

2003-07-08T23:59:59.000Z

44

Structural Sequestration of Uranium in Bacteriogenic Manganese...  

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

Highlightsbanner Structural Sequestration of Uranium in Bacteriogenic Manganese Oxides Samuel M. Webb (Stanford Synchrotron Radiation Laboratory), Bradley M. Tebo (Oregon Health...

45

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

46

Batteries with Orthorhombic Sodium Manganese Oxide Cathodes  

Berkeley National Laboratory researchers have discovered a low-cost, low-toxicity manganese oxide for rechargeable lithium and sodium batteries.

47

Degradation of Manganese Cobalt Spinel SOFC Interconnect ...  

Science Conference Proceedings (OSTI)

Presentation Title, Degradation of Manganese Cobalt Spinel SOFC Interconnect Coatings. Author(s), Jeffrey W. Fergus, Yingjia Liu, Yu Zhao. On-Site Speaker ...

48

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

49

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

50

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 and chemical oxidation.

Dozier, Monty; McFarland, Mark L.

2004-02-20T23:59:59.000Z

51

Method for magnesium sulfate recovery  

DOE Patents (OSTI)

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

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

1987-08-25T23:59:59.000Z

52

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

53

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

54

IMPROVED MAGNESIUM OXIDE SLIP CASTING METHOD  

DOE Patents (OSTI)

A process for making an aqueous magnesium oxide slip casting slurry comprising the steps of mixing finely ground fused magnesium oxide with water, milling the slurry for at least 30 hours at a temperature of 2-10 deg C (the low temperature during milling inhibiting the formation of hydrated magnesium oxide), discharging the slurry from the mill, adding hydrochloric acid as a deflocculent, and adding a scum inhibitor is presented. (AEC)

Stoddard, S.D.; Nuckolls, D.E.

1963-12-31T23:59:59.000Z

55

STATUS OF POTASSIUM IODIDE ACTIVITIES  

E-Print Network (OSTI)

To provide to the Commission revised draft NUREG-1633 (Attachment 1), “Assessment of the Use of Potassium Iodide (KI) as a Supplemental Public Protective Action During Severe Reactor Accidents ” for approval for public comment as directed in Staff Requirements- Affirmation

William D. Travers; Contacts Patricia; A. Milligan

2001-01-01T23:59:59.000Z

56

Climate VISION: Private Sector Initiatives: Magnesium: Results  

Office of Scientific and Technical Information (OSTI)

plans, the International Magnesium Association and the federal government will begin tracking progress. The results will be measured by metrics developed by the industry, in...

57

Materials Design in Magnesium Alloy Development  

Science Conference Proceedings (OSTI)

This presentation will provide insight into the status of materials design tools in its application to magnesium alloy development as well as provide forecasts as to ...

58

Magnesium: Digital Resource Center -- Background - TMS  

Science Conference Proceedings (OSTI)

WEB RESOURCE: MIL-HDBK-5H: Metallic Materials and Elements for Aerospace Vehicle Structures Link provided to Chapter 4: Magnesium Alloys, 0, 780 ...

59

Magnesium: Digital Resource Center -- Databases - TMS  

Science Conference Proceedings (OSTI)

WEB RESOURCE: MIL-HDBK-5H: Metallic Materials and Elements for Aerospace Vehicle Structures Link provided to Chapter 4: Magnesium Alloys, 0, 958 ...

60

Magnesium: Digital Resource Center -- Background - TMS  

Science Conference Proceedings (OSTI)

WEB RESOURCE: MIL-HDBK-5H: Metallic Materials and Elements for Aerospace Vehicle Structures Link provided to Chapter 4: Magnesium Alloys, 0, 793 ...

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

Magnesium: Digital Resource Center -- Databases - TMS  

Science Conference Proceedings (OSTI)

WEB RESOURCE: MIL-HDBK-5H: Metallic Materials and Elements for Aerospace Vehicle Structures Link provided to Chapter 4: Magnesium Alloys, 0, 1005 ...

62

Magnesium: Digital Resource Center Text Topic  

Science Conference Proceedings (OSTI)

Feb 11, 2007 ... E. Aghion, B. Bronfin, F. Von Buch, S. Schumann and H. Friedrich. "Dead Sea Magnesium Alloys Newly Developed for High Temperature ...

63

Nanoparticles in Magnesium Alloys: Novel Nanoscale Phenomena ...  

Science Conference Proceedings (OSTI)

Also, the in-situ creation of nanoparticles in magnesium alloy and consequent simultaneous ... Processing and Mechanical Behavior of Unalloyed Plutonium.

64

PDF: Automotive Magnesium Applications and Life Cycle ...  

Science Conference Proceedings (OSTI)

Feb 11, 2007 ... This presentation includes images of a die cast magnesium steering wheel, AZ91D cam cover, AZ91D transmission housing, AM50 door inner, ...

65

Understanding Protective Film Formation by Magnesium Alloys  

Science Conference Proceedings (OSTI)

Abstract Scope, Magnesium-based alloys are the lightest structural metals, and thus ... The present work aims to understand the mechanism(s) of protective film ...

66

Fluid Bed Dehydration of Magnesium Chloride  

Science Conference Proceedings (OSTI)

... is provided based on open literature sources, including papers and patents. ... Demonstration of Solar-Pumped Laser-Induced Magnesium Production from ...

67

Magnesium: Digital Resource Center - ARTICLE: Forming of ...  

Science Conference Proceedings (OSTI)

Sep 20, 2007 ... This paper addresses the formability of magnesium extrusions with respect to rotary-draw bending and hydro-mechanical forming, presenting ...

68

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...

69

Hydrogen Storage property of sandwiched magnesium hydride naoparticle...  

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

Storage property of sandwiched magnesium hydride naoparticle thin film Title Hydrogen Storage property of sandwiched magnesium hydride naoparticle thin film Publication Type...

70

2003 TMS Annual Meeting: Short Courses--Magnesium Metallurgy ...  

Science Conference Proceedings (OSTI)

Mar 1, 2003 ... Returned to China and started in the magnesium business in 1991 selling metals , including magnesium to the end users. Has worked on the ...

71

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.

72

Magnesium Alloys - TMS: Knowledge Resource Center  

Science Conference Proceedings (OSTI)

A.A. Luo, A.K. Sachdev, R.K. Mishra, and R.C. Kubic. An Internal Variable Approach to the Superplastic Deformation of AZ31 Magnesium Alloy [pp. 149] H.S. Lee ...

73

Innovative Vacuum Distillation for Magnesium Recycling  

Science Conference Proceedings (OSTI)

Feb 1, 2001 ... TMS Member price: 10.00. Non-member price: 25.00. TMS Student Member price : 10.00. Product In Stock. Description Magnesium recycling ...

74

Nuclear reactor shield including magnesium oxide  

DOE Patents (OSTI)

An improvement in nuclear reactor shielding of a type used in reactor applications involving significant amounts of fast neutron flux, the reactor shielding including means providing structural support, neutron moderator material, neutron absorber material and other components as described below, wherein at least a portion of the neutron moderator material is magnesium in the form of magnesium oxide either alone or in combination with other moderator materials such as graphite and iron.

Rouse, Carl A. (Del Mar, CA); Simnad, Massoud T. (La Jolla, CA)

1981-01-01T23:59:59.000Z

75

Cation Adsorption on Manganese Dioxide Impregnated Fibers  

Science Conference Proceedings (OSTI)

The complete removal of radioactive cations by standard mixed-bed ion-exchange resins is sometimes not achieved in liquid radwaste systems. This report documents an alternative ion adsorption process for the purification of liquid wastes, specifically, the use of manganese dioxide (MnO2) impregnated fibers to remove selected cations from PWR liquid waste streams.

1993-02-26T23:59:59.000Z

76

A laboratory-scale burner seeded with potassium for calibration of potassium emission/absorption instruments  

DOE Green Energy (OSTI)

In magnetohydrodynamic (MHD) power systems, potassium may be used to enhance the electrical conductivity of the high temperature products of combustion. In order to better evaluate the performance of MHD generators, it is desirable to be able to measure the distribution of the electrical conductivity of the gases throughout the channel through which the hot gases are passing. One such system is based on the emission/absorption spectra of potassium as a function of temperature. Diagnostic instruments, based on the emission/absorption characteristics of potassium in a flame or plasma require calibration in known temperature and potassium concentration conditions. A laboratory-scale hydrogen/oxygen burner which is seeded with gaseous potassium has been designed, fabricated, and operated for the purpose of providing a calibration facility for the potassium emission/absorption spectrographic (PE/AS) instrument. A nickel block was machined appropriately to provide separate flows of oxygen, hydrogen, and potassium vapor in a hot nitrogen stream mixed with hydrogen. A potassium evaporator was designed and fabricated to allow hot nitrogen gas to bubble through hot molten potassium to provide a known mass fraction of potassium to the resultant flame. The vapor pressure variation of the potassium with temperature was used to predict the amount of potassium carried to the flame by assuming that the hot nitrogen stream resulted in a saturated mixture as it bubbled through the heated molten potassium. Operational aspects as well as safety considerations in the operation of this burner are described. 10 refs., 1 fig.

Bouchillon, C.W.

1991-01-01T23:59:59.000Z

77

Analytical Controlled Losses of Potassium from Straw  

E-Print Network (OSTI)

of the ashing process. Chlorine is present in the strawsuch as potassium and chlorine in biomass ash is criticalnitrogen sulfur oxygen chlorine moisutre (% wet basis)

Thy, P.; Grundvig, S.; Jenkins, B. M.; Shiraki, R.; Lesher, C. E.

2005-01-01T23:59:59.000Z

78

Demonstration of Solar-Pumped Laser-Induced Magnesium ...  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2012 TMS Annual Meeting & Exhibition. Symposium , Magnesium Technology 2012. Presentation Title, Demonstration of ...

79

greenhouse gas balance of magnesium parts for automotive ...  

Science Conference Proceedings (OSTI)

Jul 20, 2012 ... GREENHOUSE GAS BALANCE OF MAGNESIUM PARTS FOR AUTOMOTIVE APPLICATIONS by Simone Ehrenberger, Horst E. Friedrich ...

80

TMS Professional Honors and Awards: LMD Magnesium Award  

Science Conference Proceedings (OSTI)

TMS ENERGY INITIATIVES · KNOWLEDGE ... 2005, “Heated Hydro-Mechanical Deep Drawing of Magnesium Sheet Metal” Gerrit Kurz, University of Hanover.

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

Process for preparation of potassium-38  

DOE Patents (OSTI)

A solution of potassium-38 suitable for use as a radiopharmaceutical and a method for its production. Argon is irradiated with protons having energies above the threshold for the .sup.40 Ar(p,3n).sup.38 K reaction. The resulting potassium-38 is dissolved in a sterile water and any contaminating chlorine-38 is removed.

Lambrecht, Richard M. (Quogue, NY); Wolf, Alfred P. (Setauket, NY)

1981-01-01T23:59:59.000Z

82

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

DOE Green Energy (OSTI)

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

83

Calorimetric Investigation of the Lithium–Manganese–Oxygen ...  

Science Conference Proceedings (OSTI)

Presentation Title, Calorimetric Investigation of the Lithium–Manganese–Oxygen Cathode Material System for Lithium Ion Batteries. Author(s), Damian M. Cupid, ...

84

Experimental Cell for Neutron Reflection on Lithium Manganese ...  

Science Conference Proceedings (OSTI)

Presentation Title, Experimental Cell for Neutron Reflection on Lithium Manganese Oxide to Study the Electrode/Electrolyte Interface. Author(s), Brian Kitchen.

85

A Study of Pelletization of Manganese Ore Fines  

Science Conference Proceedings (OSTI)

... ores, fine manganese fines are characterized by large amount and low price. ... A Study of Coal-Based Direct Reduction of Composite Binder Magnetite ...

86

Manganese Cobalt Spinel Oxide Based Coatings for SOFC ...  

Science Conference Proceedings (OSTI)

Presentation Title, Manganese Cobalt Spinel Oxide Based Coatings for SOFC Interconnects. Author(s), Jeffrey W. Fergus, Yingjia Liu, Yu Zhao. On-Site Speaker ...

87

High Temperature Stainless Steel Alloy with Low Cost Manganese  

High Temperature Stainless Steel Alloy with Low Cost Manganese ... ••Power industry components such as boiler tubing and piping, pressure vessels, chemical

88

Researches on Reduction Roasting of Low-grade Manganese ...  

Science Conference Proceedings (OSTI)

In this study, a kind of abundant biomass, pine black charcoal, was firstly used as a substitute for coals to reduce low-grade manganese oxide ores.

89

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

Science Conference Proceedings (OSTI)

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

90

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

91

Manganese Occurrence Near Three Coal Ash Impoundments in Illinois  

Science Conference Proceedings (OSTI)

This report describes research performed to better understand the cause of elevated manganese concentrations sometimes found in groundwater near coal ash management facilities. Three impoundments in Illinois were selected for detailed field and laboratory studies of conditions conducive to manganese release from coal ash as well as natural soils.

2002-09-24T23:59:59.000Z

92

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

93

Enhancements in Magnesium Die Casting Impact Properties  

SciTech Connect

The need to produce lighter components in transportation equipment is the main driver in the increasing demand for magnesium castings. In many automotive applications, components can be made of magnesium or aluminum. While being lighter, often times the magnesium parts have lower impact and fatigue properties than the aluminum. The main objective of this study was to identify potential improvements in the impact resistance of magnesium alloys. The most common magnesium alloys in automotive applications are AZ91D, AM50 and AM60. Accordingly, these alloys were selected as the main candidates for the study. Experimental quantities of these alloys were melted in an electrical furnace under a protective atmosphere comprising sulfur hexafluoride, carbon dioxide and dry air. The alloys were cast both in a permanent mold and in a UBE 315 Ton squeeze caster. Extensive evaluation of tensile, impact and fatigue properties was conducted at CWRU on permanent mold and squeeze cast test bars of AZ91, AM60 and AM50. Ultimate tensile strength values between 20ksi and 30ksi were obtained. The respective elongations varied between 25 and 115. the Charpy V-notch impact strength varied between 1.6 ft-lb and 5 ft-lb depending on the alloy and processing conditions. Preliminary bending fatigue evaluation indicates a fatigue limit of 11-12 ksi for AM50 and AM60. This is about 0.4 of the UTS, typical for these alloys. The microstructures of the cast specimens were investigated with optical and scanning electron microscopy. Concomitantly, a study of the fracture toughness in AM60 was conducted at ORNL as part of the study. The results are in line with values published in the literature and are representative of current state of the art in casting magnesium alloys. The experimental results confirm the strong relationship between aluminum content of the alloys and the mechanical properties, in particular the impact strength and the elongation. As the aluminum content increases from about 5% in AM50 to over 9% in AZ91, more of the intermetallic Mg17Al12 is formed in the microstructure. For instance, for 15 increase in the aluminum content from AM50 to AM60, the volume fraction of eutectic present in the microstructure increases by 35%! Eventually, the brittle Mg17Al12 compound forms an interconnected network that reduces ductility and impact resistance. The lower aluminum in AM50 and AM60 are therefore a desirable feature in applications that call for higher impact resistance. Further improvement in impact resistance depends on the processing condition of the casting. Sound castings without porosity and impurities will have better mechanical properties. Since magnesium oxidizes readily, good melting and metal transfer practices are essential. The liquid metal has to be protected from oxidation at all times and entrainment of oxide films in the casting needs to be prevented. In this regard, there is evidence that us of vacuum to evacuate air from the die casting cavity can improve the quality of the castings. Fast cooling rates, leading to smaller grain size are beneficial and promote superior mechanical properties. Micro-segregation and banding are two additional defect types often encountered in magnesium alloys, in particular in AZ91D. While difficult to eliminate, segregation can be minimized by careful thermal management of the dies and the shot sleeve. A major source of segregation is the premature solidification in the shot sleeve. The primary solid dendrites are carried into the casting and form a heterogeneous structure. Furthermore, during the shot, segregation banding can occur. The remedies for this kind of defects include a hotter shot sleeve, use of insulating coatings on the shot sleeve and a short lag time between pouring into the shot sleeve and the shot.

David Schwam; John F. Wallace; Yulong Zhu; Srinath Viswanathan; Shafik Iskander

2000-06-30T23:59:59.000Z

94

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

DOE Green Energy (OSTI)

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

95

The Role of Manganese Dioxide (MnO2) Deposition in Microbiologically Influenced Corrosion  

Science Conference Proceedings (OSTI)

This report documents the role of manganese dioxide (MnO2) in microbiologically influenced corrosion.

2004-12-20T23:59:59.000Z

96

Rechargeable Magnesium Batteries: Low-Cost Rechargeable Magnesium Batteries with High Energy Density  

Science Conference Proceedings (OSTI)

BEEST Project: Pellion Technologies is developing rechargeable magnesium batteries that would enable an EV to travel 3 times farther than it could using Li-ion batteries. Prototype magnesium batteries demonstrate excellent electrochemical behavior; delivering thousands of charge cycles with very little fade. Nevertheless, these prototypes have always stored too little energy to be commercially viable. Pellion Technologies is working to overcome this challenge by rapidly screening potential storage materials using proprietary, high-throughput computer models. To date, 12,000 materials have been identified and analyzed. The resulting best materials have been electrochemically tested, yielding several very promising candidates.

None

2010-10-01T23:59:59.000Z

97

Formation of Vanadate Conversion Coating on AZ31 Magnesium Alloy  

Science Conference Proceedings (OSTI)

In the present investigation, a chromate-free, corrosion-resistant conversion coating using vanadium based solution was applied to AZ31 magnesium alloy.

98

Stress Corrosion Cracking of Aluminium-Free Magnesium Alloys in ...  

Science Conference Proceedings (OSTI)

Presentation Title, Stress Corrosion Cracking of Aluminium-Free Magnesium Alloys in a Simulated Human Body Fluid. Author(s), Lokesh Choudhary, R. K. Singh ...

99

Climate VISION: Private Sector Initiatives: Magnesium: GHG Information  

Office of Scientific and Technical Information (OSTI)

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

100

Fatigue Predictions of Various Joints of Magnesium Alloys  

Science Conference Proceedings (OSTI)

Currently, a front shock tower of passenger vehicle is developed with various magnesium alloys and joining methods. To predict the fatigue behavior of the joints ...

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

Recycling Magnesium Alloy Housings for Notebook Computers - TMS  

Science Conference Proceedings (OSTI)

Jul 1, 2008 ... This article from Fujitsu Laboratories describes two recycling processes for magnesium alloy housings: one for recycling the excess material ...

102

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...

103

WEB RESOURCE: Magnesium Wrought Products Flow Chart - TMS  

Science Conference Proceedings (OSTI)

Aug 18, 2007 ... The following flow charts attempt to list important wrought magnesium products being made as extrusions, forgings, sheet and plate. In these ...

104

WEB RESOURCE: Magnesium Cast Products Flow Chart - TMS  

Science Conference Proceedings (OSTI)

Aug 18, 2007 ... The following flow charts attempt to list important cast magnesium products being made as die castings, sand and permanent mold castings ...

105

Stationary storage and purification of hydrogen using nickel-coated magnesium powder. Final technical report  

DOE Green Energy (OSTI)

The following conclusions were reached: (1) The concept of a coating on a magnesium particle serving as a well-supported hydrogen-permselective membrane is sound. (2) Magnesium nitride can be made to coat magnesium particles through chemical vapor deposition within a fluidized bed. (3) Magnesium nitride exhibits the properties necessary for such a coating. (4) Magnesium nitride is not chemically inert to hydrogen in the absence of ammonia at temperatures typically used to hydride/dehydride magnesium.

NONE

1999-12-30T23:59:59.000Z

106

Nano-engineering of magnesium hydride for hydrogen storage  

Science Conference Proceedings (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

107

Casting Porosity-Free Grain Refined Magnesium Alloys  

SciTech Connect

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

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

2013-08-12T23:59:59.000Z

108

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

109

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

110

Cross sections for electron scattering from magnesium  

SciTech Connect

A B-spline R-matrix (close-coupling) method has been used to perform a systematic study of angle-differential cross sections for electron scattering from neutral magnesium. The calculations cover elastic scattering and excitation of the five excited states (3s3p) {sup 3,1}P{sup o}, (3s3d) {sup 1}D, (3s4s) {sup 1}S, and (3s4p) {sup 1}P{sup o}. A multiconfiguration Hartree-Fock method with nonorthogonal orbitals was employed for an accurate representation of the target wave functions. The close-coupling expansion for the collision problem included 37 bound states of neutral magnesium. Angle-differential cross sections are presented for incident electron energies from 10 to 100 eV. These results, as well as the corresponding angle-integrated cross sections, are compared with various experimental data and predictions from other close-coupling and distorted-wave calculations. In spite of a few remaining discrepancies, the overall agreement between our results and the experimental data is very satisfactory.

Zatsarinny, Oleg; Bartschat, Klaus; Gedeon, Sergey; Gedeon, Viktor; Lazur, Vladimir; Nagy, Elizabeth [Department of Physics and Astronomy, Drake University, Des Moines, Iowa 50311 (United States); Department of Theoretical Physics, Uzhgorod State University, Uzhgorod 88000 (Ukraine)

2009-05-15T23:59:59.000Z

111

The impacts of graphene nanosheets and manganese valency on lithium storage characteristics in graphene/manganese oxide hybrid anode  

Science Conference Proceedings (OSTI)

Graphene nanosheets (GNS) with attached MnOx nanoparticles are studied in regard to their structure and morphology. The relationship between the lithium storage performances and GNS contents as well as manganese valency was investigated. Experimental ...

S. L. Cheekati; Z. Yao; H. Huang

2012-01-01T23:59:59.000Z

112

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

113

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%

114

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

115

Enhancing Tensile and Compressive Strength of AZ41 Magnesium ...  

Science Conference Proceedings (OSTI)

Al and 1 wt.% Al with 1.5 vol.% nano-sized Al2O3 (50 nm) particulates in to AZ31 magnesium alloy, respectively, using disintegrated melt deposition technique.

116

Controlling the Biodegradation Rate of Magnesium-Based Implants ...  

Science Conference Proceedings (OSTI)

Author(s), Z. Pu, D. Puleo, O.W. Dillon, Jr., I.S. Jawahir. On-Site ... By proper selection of machining conditions, magnesium-based implants with customized ...

117

SF6 Emission Reduction Partnership for the Magnesium Industry  

Science Conference Proceedings (OSTI)

Topic Summary: A cooperative effort between EPA and US magnesium industry to reduce emissions of SF6. Created On: 7/1/2008 9:12 AM, Topic View:.

118

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

119

Carbon Steel and Magnesium Oxide Dissolution for H-Canyon Process Applications  

DOE Green Energy (OSTI)

H Area Operations is planning to process plutonium-contaminated uranium metal scrap in its efforts to de-inventory excess nuclear materials. The Savannah River Technology Center (SRTC) performed flowsheet development to support the decision to process the scrap in H-Canyon using 2M nitric acid (HNO3) / 0.025M potassium fluoride (KF) and 2 g/L boron. The scrap will be charged to the H-Canyon dissolver via a stainless steel charging bundle with a carbon steel end cap that must dissolve in an appropriate time frame. Experimental work was performed with a range of potential materials to be used to fabricate the bundle end cap. Testing was conducted with samples of metal plate, wire, cans, rods, and rivets to assess their dissolution characteristics in 2M HNO3/ 0.025M KF and 2 g/L boron. Experiments also measured the amount of hydrogen gas generated during carbon steel dissolution using the above dissolver solution. Each material type and its associated dissolution characteristic relate to specific bundle end cap designs being considered. Supplemental studies were conducted to evaluate the behavior and effect of magnesium oxide (MgO) sand on dissolution of uranium metal in 2M HNO3/ 0.025M KF and 2 g/L boron. The potential exists for a small quantity of MgO to be introduced into the dissolution flowsheet due to the use of MgO sand to extinguish uranium metal fires.

PIERCE, RA

2004-04-12T23:59:59.000Z

120

Potential automotive uses of wrought magnesium alloys  

DOE Green Energy (OSTI)

Vehicle weight reduction is one of the major means available to improve automotive fuel efficiency. High-strength steels, aluminum (Al), and polymers are already being used to reduce weight significantly, but substantial additional reductions could be achieved by greater use of low-density magnesium (Mg) and its alloys. Mg alloys are currently used in relatively small quantities for auto parts, generally limited to die castings (e.g., housings). Argonne National Laboratory`s Center for Transportation Research has performed a study for the Lightweight Materials Program within DOE`s Office of Transportation Materials to evaluate the suitability of wrought Mg and its alloys to replace steel/aluminum for automotive structural and sheet applications. Mg sheet could be used in body nonstructural and semi-structural applications, while extrusions could be used in such structural applications as spaceframes. This study identifies high cost as the major barrier to greatly increased Mg use in autos. Two technical R and D areas, novel reduction technology and better hot-forming technology, could enable major cost reductions.

Gaines, L.; Cuenca, R.; Wu, S. [Argonne National Lab., IL (United States); Stodolsky, F. [Argonne National Lab., IL (United States)]|[Argonne National Lab., Washington, DC (United States)

1996-06-01T23:59:59.000Z

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

Manganese sulfide formation via concomitant microbial manganese oxide and thiosulfate reduction  

Science Conference Proceedings (OSTI)

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

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

2011-12-13T23:59:59.000Z

122

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

E-Print Network (OSTI)

The environmentally friendly n-type Mg2(Si, Sn) thermoelectric solid solutions have a strong potential of commercial utilization in thermoelectric (TE) energy conversion due to their availability, low density (~3.02 g/cm3), and high stability at middle temperature range (400-600 ?C) that are typically observed from waste heat dissipating systems. The bulk materials were prepared from element powders via slow cooking under vacuum condition and current-assisted hot-press sintering. Temperature vs time curves have been researched in this thesis for fully reacted magnesium-silicide & magnesium-stannide green ingots with doping materials i.e. antimony, bismuth by different doping ratios. These ingots were ground by a high energy ball miller, uniaxial cold pressed into half inch pallets and then sintered by Direct Current-assisted hot pressing. Different synthesis conditions such as ball milling, sintering time, pressure, have been compared by SEM images and XRD tests analysis to figure out optimized process parameters. Several samples’ thermal conductivities (?) were plotted as a function of temperature to study different synthesis strategies and doping materials’ effects on phonon scattering inside bulk thermoelectric materials.

Hu, Fang

2012-05-01T23:59:59.000Z

123

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.

124

Hydrogen Storage Properties of the Tetrahydrofuran Treated Magnesium  

DOE Green Energy (OSTI)

The electronic structure, crystalline feature and morphology of the tetrahydrofuran (THF) treated magnesium, along with its hydriding and dehydriding properties have been investigated. The THF treated magnesium absorbs 6.3 wt per cent hydrogen at 723K and 3.5 MPa. After hydrogenation, in addition to the expected MgH2, a new less-stable hydride phase appears at 673K, but not at a lower temperature. Desorption produces 5.5 wt per cent hydrogen at 723K against a back pressure of 1.3 Pa after 20 cycles of hydriding-dehydriding. The THF treatment improves the kinetics of hydrogen absorption and desorption significantly. From 723K to 623K, the THF treated Mg demonstrates acceptable reaction rates. XPS studies show that tetrahydrofuran treatment causes the electronic energy state of the magnesium surface atoms to change, but the XRD studies show the crystal structure remains unchanged. Metallographic observation of the bulk hydrides of THF treated magnesium reveal they are poly-crystalline wi th the wide-spreading slip bands and twins within the crystals, indicating the phase transformation upon hydriding causes serious stress and distortion. It appears this microstructural deformation explains the much higher energy requirements (higher pressure and temperature) for magnesium hydrogenation than the simple lattice expansion that accompany hydrogen uptake for LaNi5 and FeTi.

AU, MING

2004-05-25T23:59:59.000Z

125

Potassium, Uranium, Thorium Radiogenic Heat Contribution To Heat...  

Open Energy Info (EERE)

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:...

126

Potassium emission absorption system. Topical report 12  

DOE Green Energy (OSTI)

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

127

Low-Cost Zero-Emission Primary Magnesium Production by Solid ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Solid Oxide Membrane (SOM) Electrolysis is a new low-cost process for direct extraction of magnesium oxide to pure magnesium and oxygen gas. .... Grain Refinement of AZ91 Alloy by Addition of Ceramic Particles.

128

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

129

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

130

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

DOE Green Energy (OSTI)

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

131

PROCESSING OF SODIUM--POTASSIUM NIOBATE CERAMICS.  

SciTech Connect

Sintering studies of undoped (Na{sub 0.5}K{sub 0.5})NbO{sub 3} and the same material doped with 1/2, 1, 2, and 4 mole percent BaO and 2 mole % B{sub 2}O{sub 3} were made. The persistence of a second phase after calcining to form the compound led to a study of reactions occurring during calcination. The calcining of sodium-potassium niobates involves the formation of an intermediate compound (the second phase) and its subsequent reaction with sodium oxide and potassium oxide to form (Na{sub 0.5}K{sub 0.5})NbO{sub 3}. Sintering data show that up to 1/2 mole % BaO added to the system increases the initial densification. However, the sintered bodies then exhibit densification and form sharp cubic grains and large voids. Indications are that a liquid phase is the major contributor to densification of this system through the mechanism of particle rearrangement, and that the contribution of any sintering mechanism to densification is negligible.

Powell, B.R. Jr.

1971-01-01T23:59:59.000Z

132

Analysis of the potential for new automotive uses of magnesium  

DOE Green Energy (OSTI)

This paper describes the scope of a new project, just initiated, for the Lightweight Materials Program within the Office of Transportation Materials. The Center for Transportation Research and the Energy Technology Division at Argonne National Laboratory will assess the feasibility and technical potential of using magnesium and its alloys in place of steel or aluminum for automotive structural and sheet applications in order to enable more energy-efficient, lightweight passenger vehicles. The analysis will provide an information base to help guide magnesium research and development in the most promising directions.

Stodolsky, F.; Gaines, L.; Cuenca, R.; Wu, S.

1994-12-31T23:59:59.000Z

133

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%

134

Magnesium oxide inserts for the LECO Carbon Analyzer  

Science Conference Proceedings (OSTI)

LECO carbon analysis of plutonium metal and plutonium oxide at the Rocky Flats Plant generates several hundred kilograms of high silica residues each year. The plutonium in these residues is difficult and expensive to recover using production dissolution processes. A magnesium oxide (MgO) insert has been developed that significantly lowers the plutonium recovery costs without adversely affecting accuracy of the carbon analysis.

Bagaasen, L.M.; Jensen, C.M.

1991-01-16T23:59:59.000Z

135

Applications of Computer in Engineering Especially in Electrolysis Magnesium Industry  

Science Conference Proceedings (OSTI)

In modern times, computers have closely connection with everyone, especially scientist and engineer. Computer programs can now solve difficult problems in a fraction of the time it used to take. Computer-Aided engineering is a powerful tool and necessary ... Keywords: CFD, CAE, Electrochemistry, electrolysis, molten magnesium salt

Ze Sun; Bing Li; Jianguo Yu

2009-03-01T23:59:59.000Z

136

REGENERATION OF FISSION-PRODUCT-CONTAINING MAGNESIUM-THORIUM ALLOYS  

DOE Patents (OSTI)

A process of regenerating a magnesium-thorium alloy contaminated with fission products, protactinium, and uranium is presented. A molten mixture of KCl--LiCl-MgCl/sub 2/ is added to the molten alloy whereby the alkali, alkaline parth, and rare earth fission products (including yttrium) and some of the thorium and uranium are chlorinated and

Chiotti, P.

1964-02-01T23:59:59.000Z

137

Manganese: Recent advances in understanding its transport and neurotoxicity  

SciTech Connect

The present review is based on presentations from the meeting of the Society of Toxicology in San Diego, CA (March 2006). It addresses recent developments in the understanding of the transport of manganese (Mn) into the central nervous system (CNS), as well as brain imaging and neurocognitive studies in non-human primates aimed at improving our understanding of the mechanisms of Mn neurotoxicity. Finally, we discuss potential therapeutic modalities for treating Mn intoxication in humans.

Aschner, Michael [Departments of Pediatrics, Pharmacology, and Kennedy Center for Research on Human Development, B-3307 Medical Center North, Vanderbilt University, School of Medicine, Nashville, TN 37232-2495 (United States)]. E-mail: Michael.Aschner@vanderbilt.edu; Guilarte, Tomas R. [Neurotoxicology and Molecular Imaging Laboratory, Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD (United States); Schneider, Jay S. [Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA (United States); Zheng Wei [School of Health Sciences, Purdue University, West Lafayette, IN (United States)

2007-06-01T23:59:59.000Z

138

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

E-Print Network (OSTI)

Plutonium(VI) Sorption on Manganese-SubstitutedX-ray Beam-Induced Chemistry on Plutonium Sorbed on Variousof Plutonium . . . . . . . . . . . . . . . . .159 v E Anion

Hu, Yung-Jin Hu

2011-01-01T23:59:59.000Z

139

Field Calibration Facilities for Environmental Measurement of Radium, Thorium, and Potassium (June 1994)  

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

Field Calibration Facilities for Environmental Measurement of Radium, Thorium, and Potassium (June 1994)

140

Heat transfer during film condensation of potassium vapor  

E-Print Network (OSTI)

The object of this work is to investigate theoretically and experimentally the following two phases of heat transfer during condensation of potassium vapore, a. Heat transfer during film condensation of pure saturated ...

Kroger, Detlev Gustav

1966-01-01T23:59:59.000Z

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.


141

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

142

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

143

Switchable mirrors based on nickel-magnesium films  

DOE Green Energy (OSTI)

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

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

2001-01-16T23:59:59.000Z

144

Hydrogen Storage Properties of Magnesium Base Nanostructured Composite Materials  

DOE Green Energy (OSTI)

In this work, nanostructured composite materials have been synthesized using the mechanical alloying process. The new materials produced have been investigated by X-ray diffraction (XRD), transition electron microscope (TEM), scanning electron microscope (SEM) and electron energy dispersion spectrum (EDS) for their phase compositions, crystal structure, grain size, particle morphology and the distribution of catalyst element. Hydrogen storage capacities and the hydriding-dehydriding kinetics of the new materials have been measured at different temperatures using a Sieverts apparatus. It is observed that mechanical alloying accelerates the hydrogenation kinetics of the magnesium based materials at low temperature, but a high temperature must be provided to release the absorbed hydrogen from the hydrided magnesium based materials. It is believed that the dehydriding temperature is largely controlled by the thermodynamic configuration of magnesium hydride. Doping Mg-Ni nano/amorphous composite materials with lanthanum reduces the hydriding and dehydriding temperature. Although the stability of MgH2 can not be easily reduced by ball milling alone, the results suggest the thermodynamic properties of Mg-Ni nano/amorphous composite materials can be alternated by additives such as La or other effective elements. Further investigation toward understanding the mechanism of additives will be rewarded.

AU, M

2004-04-30T23:59:59.000Z

145

Potential applications of wrought magnesium alloys for passenger vehicles  

DOE Green Energy (OSTI)

Vehicle weight reduction is one of the major means available for improving automotive fuel efficiency. Although high-strength steels, aluminum (Al), and polymers are already being used to achieve significant weight reductions, substantial additional weight reductions could be achieved by increased use of magnesium (Mg) and its alloys, which have very low density. Magnesium alloys are currently used in relatively small quantities for auto parts; use is generally limited to die castings, such as housings. The Center for Transportation Research at Argonne National Laboratory has performed a study for the Lightweight Materials Program within DOE`s Office of Transportation Materials to evaluate the suitability of wrought Mg and its alloys to replace steel or aluminum for automotive structural and sheet applications. This study identifies technical and economic barriers to this replacement and suggests R&D areas to enable economical large-volume use. Detailed results of the study will be published at a later date. Magnesium sheet could be used in body nonstructural and semi-structural applications, while extrusions could be used in such structural applications as spaceframes. Currently, Mg sheet has found limited use in the aerospace industry, where costs are not a major concern. The major barrier to greatly increased automotive use is high cost; two technical R&D areas are identified that could enable major reductions in costs. These are novel reduction technology and better hot-forming technology, possibly operating at lower temperatures and involving superplastic behavior.

Gaines, L.; Cuenca, R.; Stodolsky, F.; Wu, S.

1995-12-31T23:59:59.000Z

146

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

147

The Use of Manganese Substituted Ferrotitanium Alloys for Energy Storage  

DOE Green Energy (OSTI)

Experimental results are presented on properties of major practical importance in the utilization of manganese-substituted ferrotitanium alloys as hydrogen storage media. Consideration is given to (1) pressure-composition-temperature characteristics, (2) particle attrition properties, (3) effects of long-term cycling on alloy stability, (4) ease of activation and reactivation, and (5) effects of contaminants on alloy activity. The performance of ternary alloys is compared with that of titanium iron as is the development of an optimum ternary alloy for use with a particular peak shaving operation, i.e., the regenerative H2-Cl system.

Johnson, J.R.; Reilly, J.

1977-12-05T23:59:59.000Z

148

Adsorption of Propane on the Magnesium Oxide (100) Surface and Synthesis of Anodized Aluminum Oxide.  

E-Print Network (OSTI)

??This work is divided into two parts: the adsorption of propane on the magnesium oxide (100) surface and the synthesis of anodized aluminum oxide. The… (more)

Felty, Michael John

2008-01-01T23:59:59.000Z

149

The Effect of Manganese Additions on the Reactive Evaporation of Chromium in Ni-Cr Alloys  

DOE Green Energy (OSTI)

Chromium is used as an alloy addition in stainless steels and nickel-chromium alloys to form protective chromium oxide scales. Chromium oxide undergoes reactive evaporation in high temperature exposures in the presence of oxygen and/or water vapor. The deposition of gaseous chromium species onto solid oxide fuel cell electrodes can reduce the efficiency of the fuel cell. Manganese additions to the alloy can reduce the activity of chromium in the oxide, either from solid solution replacement of chromium with manganese (at low levels of manganese) or from the formation of manganese-chromium spinels (at high levels of manganese). This reduction in chromium activity leads to a predicted reduction in chromium evaporation by as much as a factor of 35 at 800 C and 55 at 700 C. The results of evaporation loss measurements on nickel-chromium-manganese alloys are compared with the predicted reduction. Quantifying the effects of manganese additions on chromium evaporation should aid alloy development of metallic interconnects and balance-of-plant alloys.

Holcomb, Gordon R.; Alman, David E.

2004-10-20T23:59:59.000Z

150

Proton conduction in electrolyte made of manganese dioxide for hydrogen gas sensor  

DOE Green Energy (OSTI)

We propose a network model of oxygen-pairs to store and conduct protons on the surface of manganese dioxide with a weak covalent bond like protons stored in pressured ice. The atomic distances of oxygen-pairs were estimated between 2.57 and 2.60 angstroms in crystal structures of ramsdellite-type and lambda-type manganese dioxides by using protonated samples and inelastic neutron scattering measurements. Good properties for a hydrogen gas sensor using electrolytes made of manganese dioxides that contain such oxygen-pairs were confirmed experimentally.

Koyanaka, Hideki [Kyoto University, Japan; Ueda, Yoshikatsu [Kyoto University, Japan; Takeuchi, K [Tokyo University of Science, Oshamanbe Hokkaido, Japan; Kolesnikov, Alexander I [ORNL

2012-01-01T23:59:59.000Z

151

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

152

Test Requirements and Conceptual Design for a Potassium Test Loop to Support an Advanced Potassium Rankine Cycle Power Conversion Systems  

SciTech Connect

Parameters for continuing the design and specification of an experimental potassium test loop are identified in this report. Design and construction of a potassium test loop is part of the Phase II effort of the project ''Technology Development Program for an Advanced Potassium Rankine Power Conversion System''. This program is supported by the National Aeronautics and Space Administration. Design features for the potassium test loop and its instrumentation system, specific test articles, and engineered barriers for ensuring worker safety and protection of the environment are described along with safety and environmental protection requirements to be used during the design process. Information presented in the first portion of this report formed the basis to initiate the design phase of the program; however, the report is a living document that can be changed as necessary during the design process, reflecting modifications as additional design details are developed. Some portions of the report have parameters identified as ''to be determined'' (TBD), reflecting the early stage of the overall process. In cases where specific design values are presently unknown, the report attempts to document the quantities that remain to be defined in order to complete the design of the potassium test loop and supporting equipment.

Yoder, JR.G.L.

2006-03-08T23:59:59.000Z

153

Investigation of manganese dioxide as an improved solid desiccant  

DOE Green Energy (OSTI)

This report describes the preparation of a series of manganese oxides and an analysis of their sorptive, structural, and surface characteristics as low-energetic desiccants for passive dehumidification and active desiccant cooling systems. A cusped Type III isotherm for the adsorption of water is reported for the first time. The data are interpreted as evidence of a first-order phase change from a two-dimensional gas to a liquid film in the first reversibly adsorbed layer. It appears that the water adsorption characteristics of MnO/sub 2/ compared to standard desiccants which exhibit Type II isotherms are due at least in part to differences in the physical topography and electronic properties of the desiccant substrates: MnO/sub 2/ is a p-type semiconductor with essentially-flat, monoenergetic surface structures, while standard desiccants like silica gel are electronic insulators with irregular, heteroenergetic surfaces.

Fraioli, A.V.

1983-03-01T23:59:59.000Z

154

MANGANESE OXIDE AS A NEW CATHODE CATALYST IN MICROBIAL FUEL CELLS (MFCs).  

E-Print Network (OSTI)

??This study focused on manganese oxides with a cryptomelane-type octahedral molecular sieve (OMS-2) structure to replace platinum as a cathode catalyst in microbial fuel cells… (more)

Li, Xiang

2011-01-01T23:59:59.000Z

155

Fabrication and characterization of manganese ferrite nanospheres as a magnetic adsorbent of chromium  

Science Conference Proceedings (OSTI)

Manganese ferrite nanospheres constructed by nanoparticles were synthesized in high yield via a general, one-step, and templatefree solvothermal method. The product was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and ...

Li-Xia Yang, Feng Wang, Yan-Feng Meng, Qing-Hua Tang, Zi-Qi Liu

2013-01-01T23:59:59.000Z

156

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

157

C:\\Eco-SSLs\\Contaminant Specific Documents\\Manganese\\April 2007...  

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

Toxicity in Field Grown Tea Plants and the Microdistribution of Manganese in the Leaf Tissues as Revealed by Electron Probe X-Ray Micrography. Soil Sci. Plant Nutr. 27(3):...

158

Heat transfer during film condensation of potassium vapor on a horizontal plate  

E-Print Network (OSTI)

The object of the investigation is to analyze the following two features of heat transfer during condensation of potassium vapor: a. Heat transfer during film condensation of a pure saturated potassium vapor on a horizontal ...

Meyrial, Paul M.

1968-01-01T23:59:59.000Z

159

Low-temperature electron irradiation and annealing in pure magnesium  

Science Conference Proceedings (OSTI)

In this study of magnesium after 1.0 MeV electron irradiations at 1.55/sup 0/K, it has been observed that the damage production rate in Mg is (3.57 +- 0.03) x 10/sup -26/ ..cap omega..cm/(e/sup -/ cm/sup 2/). There is no evidence for thermal annealing up to 4/sup 0/K. The low temperature recovery in magnesium is found to consist of two broad substages between 4 to 14/sup 0/K, both of which exhibit evidence for correlated and uncorrelated recovery processes. The two substages are found to have very different frequency factors for annealing, and there is evidence that the recovery processes in the second substage are influenced by those in the first. A model for recovery is proposed using the split configuration in the plane which explains the first substage as being due to interstitial migration in the basal plane and the second to migration perpendicular to the plane.

Simester, J.H.

1982-01-01T23:59:59.000Z

160

BROCHURE ON POTASSIUM IODIDE (KI) FOR THE GENERAL PUBLIC  

E-Print Network (OSTI)

Potassium Iodide Activities ” dated June 29, 2001, the staff is submitting revised draft NUREG-1633 to the Commission for review prior to publication for public comment. This paper also provides the text of a proposed public information brochure for Commission review and comment. BACKGROUND:

William D. Travers; Kathy Halvey Gibson

2002-01-01T23:59:59.000Z

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

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

162

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

163

Hot coal gas desulfurization with manganese-based sorbents. Quarterly report, October--December 1993  

SciTech Connect

The focus of work being performed on Hot Coal Gas Desulfurization at the Morgantown Energy Technology Center is primarily in the use of zinc ferrite and zinc titanate sorbents; however, prior studies indicated that an alternate sorbent, manganese dioxide-containing ore in mixture with alumina (75 wt% ore + 25 wt% Al{sub 2}O{sub 3}) may be a viable alternative to zinc-based sorbents. Manganese, for example, has a lower vapor pressure in the elemental state than zinc hence it is not as likely to undergo depletion from the sorbent surface upon loading and regeneration cycles. Also manganese oxide is less readily reduced to the elemental state than iron hence the range of reduction potentials for oxygen is somewhat greater than for zinc ferrite. In addition, thermodynamic analysis of the manganese-oxygen-sulfur system shows it to be less amenable to sulfation than zinc ferrite. Potential also exists for utilization of manganese at higher temperatures than zinc ferrite or zinc titanate. This Fifth Quarterly Report documents progress in pellet testing via thermogravimetric analysis of pellet formulation FORM4-A of a manganese ore/alumina combination. This formulation, described more fully in the Quarterly Technical Progress Report of October 15, 1993, consists of manganese carbonate combined with alundum. A 2-inch fixed-bed reactor has been fabricated and is now ready for subjecting pellets to cyclic loading and regeneration; however, a minor problem has arisen during the regeneration cycle in that sulfur tends to form and plug the exit tube during the early stage of regeneration. This problem is about to be overcome by increasing the flow rate of air during the regeneration cycle resulting in more oxidizing conditions and hence less tendency for sulfide sulfur (S{sup =}) to oxidize to the intermediate elemental form (S{sup o}) rather than to 4-valent (S{sup +4}).

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

1994-01-01T23:59:59.000Z

164

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

165

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

E-Print Network (OSTI)

Geology, University of California, Davis, CA 95616. whcasey@ucdavis.edu keywords: photosynthesis, magnesium isotopes,Isotope Fractionation in Chlorophyll-a Photosynthesis Jay R. Black Department of Chemistry Department of Geology,

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

2006-01-01T23:59:59.000Z

166

Near Net-Shaped Magnesium Aluminate Spinel by the Oxidation of ...  

Science Conference Proceedings (OSTI)

The ductile magnesium can endow the precursor with the green strength ..... by Oxidation of Melt Spun Ag-Ho-Ba-Cu Alloy Ribbon," Jpn. J. Appl. Phys., 27[2] ...

167

Performance characteristics of gravity-assisted, potassium heat pipes  

SciTech Connect

Experiments with potassium-stainless steel gravity-assisted heat pipes were performed. Performance limitations due to entrainment or flooding of the liquid return flow are compared with analytical model predictions. The effect of heated pool height was investigated and problems with surface wetting are discussed. A comparison between entrainment limits for smooth-walled and textured-walled heat pipes was made and a minimum internal surface texturing depth is suggested.

Prenger, F.C.; Keddy, E.S.; Sena, J.T.

1985-01-01T23:59:59.000Z

168

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

Science Conference Proceedings (OSTI)

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

Dr. Brian Dixon

2008-12-30T23:59:59.000Z

169

Experiments on sorption properties of gamma-manganese dioxide under isothermal conditions  

DOE Green Energy (OSTI)

To characterize promising solid desiccant materials for solar desiccant cooling applications, we measured the sorption properties of gamma-manganese dioxide under isothermal conditions using gravimetric methods. Tests were performed at 20/sup 0/C and 40/sup 0/C, a flow rate of about 110 cm/sup 3//min, a pressure of 1 atm, and relative humidities between 3% and 90%. We found the equilibrium water capacity of gamma-manganese dioxide to be much lower than that of silica gel (5% compared with 37% to 40%). The uncertainty in the manganese dioxide capacity calculation is relatively high (+-14%) because of the low sorption capacity of the small sample available (less than 0.3 g). Because of its low adsorption capacity, it cannot be used as a stand-alone desiccant in desiccant dehumidifiers. It may be used in composites with silica gel if its moisture diffusivity is considerably higher than that of silica gel. The moisture diffusivity in manganese dioxide and silica gel/manganese dioxide composites needs to be assessed and compared with that of silica gel for evaluating the composites as advanced desiccants.

Zangrando, F.; Choudhury, K.; Pesaran, A.A.

1986-05-01T23:59:59.000Z

170

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.

171

Nanostructured lithium nickel manganese oxides for lithium-ion batteries.  

DOE Green Energy (OSTI)

Nanostructured lithium nickel manganese oxides were investigated as advanced positive electrode materials for lithium-ion batteries designated to power plug-in hybrid electric vehicles and all-electric vehicles. The investigation included material characterization and electrochemical testing. In cell tests, the Li{sub 1.375}Ni{sub 0.25}Mn{sub 0.75}O{sub 2.4375} composition achieved high capacity (210 mAh g{sup -1}) at an elevated rate (230 mA g{sup -1}), which makes this material a promising candidate for high energy density Li-ion batteries, as does its being cobalt-free and uncoated. The material has spherical morphology with nanoprimary particles embedded in micrometer-sized secondary particles, possesses a multiphase character (spinel and layered), and exhibits a high packing density (over 2 g cm{sup -3}) that is essential for the design of high energy density positive electrodes. When combined with the Li{sub 4}Ti{sub 5}O{sub 12} stable anode, the cell showed a capacity of 225 mAh g{sup -1} at the C/3 rate (73 mA g{sup -1}) with no capacity fading for 200 cycles. Other chemical compositions, Li{sub (1+x)}Ni{sub 0.25}Mn{sub 0.75}O{sub (2.25+x/2)} (0.32 {le} x {le} 0.65), were also studied, and the relationships among their structural, morphological, and electrochemical properties are reported.

Deng, H.; Belharouak, I.; Cook, R. E.; Wu, H.; Sun, Y.-K.; Amine, K.; Hanyang Univ.

2010-02-25T23:59:59.000Z

172

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; Gorti, Sarma B [ORNL; Simunovic, Srdjan [ORNL

2013-01-01T23:59:59.000Z

173

Convergent close-coupling calculations of positron-magnesium scattering  

SciTech Connect

The single-center convergent close-coupling method has been applied to positron-magnesium scattering at incident energies from 0.01 to 100 eV. Cross sections are presented for elastic scattering and excitation of 3 {sup 1}P, as well as for the total ionization and total scattering processes. We also provide an estimate of the positronium formation cross section. The results agree very well with the measurements of the total cross section by Stein et al. [Nucl. Instrum. Methods Phys. Res. Sect. B 143, 68 (1998)], and consistent with the positronium formation measurements of Surdutovich et al. [Phys. Rev. A 68, 022709 (2003)] for positron energies above the ionization threshold. For energies below the positronium formation threshold (0.8 eV) we find a large P-wave resonance at 0.17 eV. A similar resonance behavior was found by Mitroy and Bromley [Phys. Rev. Lett. 98, 173001 (2007)] at an energy of 0.1 eV.

Savage, Jeremy S.; Fursa, Dmitry V.; Bray, Igor [ARC Centre for Antimatter-Matter Studies, Curtin University of Technology, GPO Box U1987, Perth, WA 6845 (Australia)

2011-06-15T23:59:59.000Z

174

Effects of CO{sub 2} and nitrogen fertilization on growth and nutrient content of juvenile ponderosa pine  

DOE Green Energy (OSTI)

This data set presents measured values of plant diameter and height, biomass of plant components, and nutrient (carbon, nitrogen, phosphorus, sulfur, potassium, calcium, magnesium, boron, copper, iron, manganese, and zinc) concentrations from a study of the effects of carbon dioxide and nitrogen fertilization on ponderosa pine (Pinus ponderosa Dougl. ex Laws.) conducted in open-top chambers in Placerville, California, from 1991 through 1996. This data set contains values from 1991 through 1993.

Johnson, D.W. [Desert Research Inst., Reno, NV (United States). Biological Sciences Center]|[Univ. of Nevada, Reno, NV (United States). Coll. of Agriculture; Ball, J.T. [Desert Research Inst., Reno, NV (United States). Biological Sciences Center; Walker, R.F. [Univ. of Nevada, Reno, NV (United States). Coll. of Agriculture; Cushman, R.M. [Oak Ridge National Lab., TN (United States). Carbon Dioxide Information Analysis Center

1998-03-01T23:59:59.000Z

175

Laboratory Evaluation of the Effects of Potassium Acetate Deicing Chemicals on the Performance of Concrete  

Science Conference Proceedings (OSTI)

Recent evidence suggests that the most commonly used salt for snow and ice control on airfield pavements, potassium acetate (KAc), may adversely impact long-term durability of concrete. This report provides interim findings from a study on effects of potassium acetate on performance of concrete. The main objectives of this program are as follows: Determine whether potassium acetate solution exacerbates alkali-silica reaction (ASR) under field conditions and in the laboratory under simulated field and ac...

2010-12-09T23:59:59.000Z

176

REDUCTION OF URANIUM HEXAFLUORIDE RETENTION ON BEDS OF MAGNESIUM FLUORIDE USED FOR REMOVAL OF TECHNETIUM HEXAFLUORIDE  

SciTech Connect

The excessive loss of uranium incurred when discarding magnesium fluoride, (the adsorber used to selectively remove technetium hexafluoride from uranium hexafluoride streams) is a problem common to all volatility processes for recovering enriched uranium fuels. As a result of the work described, two schemes for the release of the uranium hexafluoride from the magnesium fluoride and its separation from the technetium hexafluoride are proposed. One scheme depends on preferential thermal desorption of the uranium hexafluoride at 350 deg C and the other on selective adsorption of the uranium hexafluoride on sodium fluoride pellets following the codesorption of the two hexafluorides with fluorine at 500 deg C from the magnesium fluoride pellets. These proposals are aimed at reducing the amount of retained uranium to less than 1 g per 1000 g of discardable magnesium fluoride. In the work reported, the deposition of uranium on magnesium fluoride as a function of heating, fluorination, and hydrogen fluoride pretreatment of the magnesium fluoride pellets prior to exposure to uranium hexafluoride was characterized in a series of gasometric studies. The dependence of the quantity of uranium hexafluoride adsorbed on pressure and temperature was also determined. The data show that physical adsorption is the mechanism for the deposition of most of the uranium hexafluoride on well- stabilized magnesium fluoride pellets. More than 90% of the adsorbate can be removed by heating to 350 deg C. Chemisorption (formation of a double salt) is probably not involved because of the small (<0.05) mole ratio of UF/sub 6//MgF/ sub 2/ observed. (auth)

Katz, S.

1964-01-31T23:59:59.000Z

177

Kinetics of Chromium(III) Oxidation by Manganese(IV) Oxides Using  

E-Print Network (OSTI)

. This represents the first study to determine the chemical kinetics of Cr(III) oxidation on Mn-oxides. The results focusing on the "chemical" kinetics of Cr(III) oxidation on manganese oxides, i.e., the initial rates of Obtaining and Analyzing Kinetic Data. In Rates of Soil Chemical Processes, Sparks, D. L., Suarez, D. L., Eds

Sparks, Donald L.

178

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

179

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

180

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.


181

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

Science Conference Proceedings (OSTI)

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

182

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

Science Conference Proceedings (OSTI)

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

183

Effect of Potassium Addition on Coprecipitated Iron Catalysts for Fischer-Tropsch Synthesis Using Bio-oil-syngas  

Science Conference Proceedings (OSTI)

The effects of potassium addition and the potassium content on the activity and selectivity of coprecipitated iron catalyst for Fischer-Tropsch synthesis (FTS) were studied in a fixed bed reactor at 1.5 MPa

Zhao-xiang Wang; Ting Dong; Tao Kan; Quan-xin Li

2008-01-01T23:59:59.000Z

184

Improved efficiency in the sulfur dioxide-iodine hydrogen cycle through the use of magnesium oxide  

DOE Green Energy (OSTI)

The reaction of iodine with dry magnesium oxide and magnesium sulfite hexahydrate was studied experimentally as a possible means of improving the efficiency of the sulfur dioxide-iodine cycle. When no extra water was introduced, the maximum product yield was 67% obtained at 423 K. With excess water vapor, a nonporous plug was formed which prevented complete reaction. In the second case, maximum yield was 62% measured at 433 K showing that added water does not increase reaction products. This reaction gives an alternate route for producing hydrogen from water via the sulfur dioxide-iodine process.

Mason, C.F.V.; Bowman, M.G.

1981-01-01T23:59:59.000Z

185

Multiple Shaker potassium channels in a primitive metazoan  

E-Print Network (OSTI)

Voltage-gated potassium channels are critical elements in providing functional diversity in nervous systems. The diversity of voltage-gated K+ channels in modern triploblastic metazoans (such as mollusks, arthropods and vettebrates) is provided primarily by four gene subfamilies (Shaker, Shal, Shab, and Shaw), but there has been no data from the ancient diploblastic metazoans until now. Diploblasts, represented by jellyfish and other coelenterates, arose during the first major metazoan radiation and are the most structurally primitive animals to have true nervous systems. By comparing the K+ channels of diploblasts and triploblasts, we may determine the fundamental set of K+ channels present in the first nervous systems. We now report the isolation of two Shaker subfamily cDNA clones, jShak1 and jShak2, from the hydrozoan jellyfish Polyorchis

Timothy Jegla; Nikita Grigoriev; Z Warren J. Gallin; Lawrence Salkoff; Andrew N. Spencer

1995-01-01T23:59:59.000Z

186

High temperature vapor pressure and the critical point of potassium  

SciTech Connect

The vapor pressure of potassium was experimentally determined from 2100 deg F up to-its critical temperature. An empirical equation of the form ln P = A + B/T + C ln T + DT/sup 1.5/ was found to best fit the data. A critical pressure of 2378.2 plus or minus 4.0 psia (161.79 plus or minus 0.27 ata) was measured. The corresponding critical temperature, extrapolated from the pressure-- temperature curve, is 4105.4 plus or minus 5 deg R (2280.8 plus or minus 3 deg K). The technique employed was tae pressure tube method developed earlier in this laboratory and used for determining the vapor pressure of rubidium and cesium. This method measures tae critical pressure directly, as well as the vapor pressure st lower temperatures. (4 tables, 6 figures, 26 references) (auth)

Jerez, W.R.; Bhise, V.S.; Das Gupta, S.; Bonilla, C.F.

1973-01-01T23:59:59.000Z

187

Photoionization of potassium atoms from the ground and excited states  

Science Conference Proceedings (OSTI)

The Dirac-based B-spline R-matrix method is used to investigate the photoionization of atomic potassium from the 4s ground and 4p, 5s-7s, 3d-5d excited states. The effect of the core polarization by the outer electron is included through the polarized pseudostates. Besides the dipole core polarization, we also found a noticeable influence of the quadrupole core polarization. We obtained excellent agreement with experiment for cross sections of the 4s photoionization, including accurate description of the near-threshold Cooper-Seaton minimum. We also obtained close agreement with experiment for the 4p photoionization, but there are unexpectedly large discrepancies with available experimental data for photoionization of the 5d and 7s excited states.

Zatsarinny, O. [Department of Physics and Astronomy, Drake University, Des Moines, Iowa 50311 (United States); Tayal, S. S. [Department of Physics, Clark Atlanta University, Atlanta, Georgia 30314 (United States)

2010-04-15T23:59:59.000Z

188

Summary of potassium/argon dating, 1981. Topical report  

DOE Green Energy (OSTI)

The analytical results for the last fiscal year effort in potassium/argon dating in support of US Department of Energy programs are summarized. Nearly 100 new dates have been generated. Recalibration of the argon extraction tables resulted in refinement of values for tracer ratios and depletion constants for our two extraction lines. Tracer ratios are ({sup 36}Ar/{sup 38}Ar){sub T} = 0.0308 and 0.0000449; ({sup 40}Ar/{sup 38}Ar){sub T} = 0.0501 and 0.0014 for extraction tables 1 and 2, respectively. Tracer depletion constants are -0.0002250 and -0.0005501 for tables 1 and 2, respectively. Initial values for the argon tracer pipettes are 3.2522 x 10{sup -11} moles and 3.9329 x 10{sup -11} moles for tables 1 and 2, respectively.

Evans, S.H. Jr.; Brown, F.H.

1981-09-01T23:59:59.000Z

189

Formation of manganese {delta}-doped atomic layer in wurtzite GaN  

Science Conference Proceedings (OSTI)

We describe the formation of a {delta}-doped manganese layer embedded within c-plane wurtzite gallium nitride using a special molecular beam epitaxy growth process. Manganese is first deposited on the gallium-poor GaN (0001) surface, forming a {radical}(3) Multiplication-Sign {radical}(3)-R30 Degree-Sign reconstructed phase. This well-defined surface reconstruction is then nitrided using plasma nitridation, and gallium nitride is overgrown. The manganese content of the {radical}(3) Multiplication-Sign {radical}(3)-R30 Degree-Sign phase, namely one Mn per each {radical}(3) Multiplication-Sign {radical}(3)-R30 Degree-Sign unit cell, implies that the MnGaN alloy layer has a Mn concentration of up to 33%. The structure and chemical content of the surface are monitored beginning from the initial growth stage up through the overgrowth of 20 additional monolayers (MLs) of GaN. An exponential-like drop-off of the Mn signal with increasing GaN monolayers, as measured by Auger electron spectroscopy, indicates that the highly concentrated Mn layer remains at the {delta}-doped interface. A model of the resultant {delta}-doped structure is formulated based on the experimental data, and implications for possible spintronic applications are discussed.

Shi Meng; Chinchore, Abhijit; Wang Kangkang; Mandru, Andrada-Oana; Liu Yinghao; Smith, Arthur R. [Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701 (United States)

2012-09-01T23:59:59.000Z

190

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

191

Kinetic and morphological development of oxide-sulfide scales on manganese at 1,073 K  

Science Conference Proceedings (OSTI)

The corrosion behavior of manganese in controlled gas atmospheres of SO{sub 2}-CO{sub 2}-CO-N{sub 2} at 1073 K was studied. Under all conditions, the gas phase was slow to equilibrate, and catalysis of the gas affected the corrosion mechanism and resulting scale morphologies. Product scales invariably became detached from the metal during reaction, but the high manganese vapor pressure meant that no slowing of reaction resulted. Corrosion under conditions where MnS was the equilibrium reaction product led to the formation of a sulfide scale. At low p{sub s{sub 2}} values, this scale grew by reaction with either COS or SO{sub 2} according to parabolic kinetics. Gases with equilibrium compositions calculated to produce MnO, in fact corroded manganese to produce an inner layer of oxide plus sulfide, and an outer layer of MnO. The tendency to form sulfide was more marked at lower SO{sub 2} partial pressure and higher sulfur activities, the latter resulting from gas catalysis. These effects are due to the fact that SO{sub 2} is the principal reactant species.

McAdam, G.; Yound, D.J. (Univ. of New South Wales, Kensington (Australia))

1992-04-01T23:59:59.000Z

192

Morphological development of oxide-sulfide scales on iron and iron-manganese alloys  

Science Conference Proceedings (OSTI)

Pure iron and alloys containing 2, 15, 25, and 50 wt.% manganese have been reacted at 1073 K in controlled gas atmospheres of SO/sub 2/-CO/sub 2/-CO-N/sub 2/. Equilibrium gas compositions were such that (1) FeS was stable but not FeO, or (2) both FeS and FeO were stable, or (3) FeO was stable but not FeS; in all cases, both MnS and MnO were stable. Under all reaction conditions, pure iron corroded to produce both sulfide and oxide. The resultant scale morphologies were consistent with local solid-gas equilibrium for the case in which both oxide and sulfide were stable but in the other cases indicated that equilibrium was not achieved and that direct reaction with SO/sub 2/(g) was responsible for corrosion. Additions of manganese did not greatly alter the scale morphologies. Under reaction conditions that were oxidizing and sulfidizing, very high levels of manganese were required to reduce the corrosion rate. On the other hand, relatively low levels had a beneficial effect both when FeO but not FeS was thermodynamically stable and similarly when FeS but not FeO was stable.

McAdam, G.; Young, D.J.

1987-10-01T23:59:59.000Z

193

CO2 Capture by Absorption with Potassium Carbonate  

Science Conference Proceedings (OSTI)

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

194

Experimental evaluation and modeling of a turbine blade with potassium evaporative cooling  

E-Print Network (OSTI)

A new method of turbine blade cooling, the Return Flow Cascade, has been developed in which vaporization of a liquid metal such as potassium is used to maintain the blade surface at a nearly uniform temperature. Turbine ...

Townsend, Jessica Lee

2004-01-01T23:59:59.000Z

195

Tensile mechanical properties and strengthening mechanism of hybrid carbon nanotube and silicon carbide nanoparticle-reinforced magnesium alloy composites  

Science Conference Proceedings (OSTI)

AZ91 magnesium alloy hybrid composites reinforced with different hybrid ratios of carbon nanotubes (CNTs) and silicon carbide (SiC) nanoparticulates were fabricated by semisolid stirring assisted ultrasonic cavitation. The results showed that grains ...

Xia Zhou; Depeng Su; Chengwei Wu; Liming Liu

2012-01-01T23:59:59.000Z

196

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

E-Print Network (OSTI)

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

Komander, Johann Kasper

2009-01-01T23:59:59.000Z

197

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

E-Print Network (OSTI)

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

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

2010-01-01T23:59:59.000Z

198

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

199

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

200

SAFETY CONSIDERATIONS FOR HANDLING PLUTONIUM, URANIUM, THORIUM, THE ALKALI METALS, ZIRCONIUM, TITANIUM, MAGNESIUM, AND CALCIUM  

SciTech Connect

BS>This report compiles from various sources safety considerations for work with the special metals plutonium, uranium, thorium, the alkali group, magnesium, titanium, calcium, and zirconium. General criteria to be observed in handling all of these metals and their alloys are listed, as well as characteristics of individual metals with regard to health hazards, pyrophoricity, explosiveness, and other chemical reactions, in both handling and storage. (auth)

Stout, E.L. comp.

1957-09-01T23:59:59.000Z

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.


201

Performance correlations for high temperature potassium heat pipes  

SciTech Connect

Potassium heat pipes designed for operation at a nominal temperature of 775K have been developed for use in a heat pipe cooled reactor design. The heat pipes operate in a gravity assist mode with a maximum required power throughput of approximately 16 kW per heat pipe. Based on a series of sub-scale experiments with 2.12 and 3.2 cm diameter heat pipes the prototypic heat pipe diameter was set at 5.7 cm with a simple knurled wall wick used in the interests of mechanical simplicity. The performance levels required for this design had been demonstrated in prior work with gutter assisted wicks and emphasis in the present work was on the attainment of similar performance with a simplified wick structure. The wick structure used in the experiment consisted of a pattern of knurled grooves in the internal wall of the heat pipe. The knurl depth required for the planned heat pipe performance was determined by scaling of wick characteristic data from the sub-scale tests. These tests indicated that the maximum performance limits of the test heat pipes did not follow normal entrainment limit predictions for textured wall gravity assist heat pipes. Test data was therefore scaled to the prototype design based on the assumption that the performance was controlled by an entrainment parameter based on the liquid flow depth in the groove structure. This correlation provided a reasonable fit to the sub-scale test data and was used in scale up of the design from the 8.0 cm/sup 2/ cross section of the largest sub-scale heat pipe to the 25.5 cm/sup 2/ cross section prototype. Correlation of the model predictions with test data from the prototype is discussed.

Merrigan, M.A.; Keddy, E.S.; Sena, J.T.

1987-01-01T23:59:59.000Z

202

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

DOE Patents (OSTI)

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

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

2013-06-25T23:59:59.000Z

203

Relationship between blood manganese and blood pressure in the Korean general population according to KNHANES 2008  

SciTech Connect

Introduction: We present data on the association of manganese (Mn) level with hypertension in a representative sample of the adult Korean population who participated in the Korean National Health and Nutrition Examination Survey (KNHANES) 2008. Methods: This study was based on the data obtained by KNHANES 2008, which was conducted for three years (2007-2009) using a rolling sampling design involving a complex, stratified, multistage, probability-cluster survey of a representative sample of the noninstitutionalized civilian population of South Korea. Results: Multiple regression analysis after controlling for covariates, including gender, age, regional area, education level, smoking, drinking status, hemoglobin, and serum creatinine, showed that the beta coefficients of log blood Mn were 3.514, 1.878, and 2.517 for diastolic blood pressure, and 3.593, 2.449, and 2.440 for systolic blood pressure in female, male, and all participants, respectively. Multiple regression analysis including three other blood metals, lead, mercury, and cadmium, revealed no significant effects of the three metals on blood pressure and showed no effect on the association between blood Mn and blood pressure. In addition, doubling the blood Mn increased the risk of hypertension 1.828, 1.573, and 1.567 fold in women, men, and all participants, respectively, after adjustment for covariates. The addition of blood lead, mercury, and cadmium as covariates did not affect the association between blood Mn and the prevalence of hypertension. Conclusion: Blood Mn level was associated with an increased risk of hypertension in a representative sample of the Korean adult population. - Highlights: {yields} We showed the association of manganese with hypertension in Korean population. {yields} This study was based on the data obtained by KNHANES 2008. {yields} Blood manganese level was associated with an increased risk of hypertension.

Lee, Byung-Kook [Institute of Environmental and Occupational Medicine, Soonchunhyang University 646 Eupnae-ri, Shinchang-myun, Asan-si, Choongnam 336-745 (Korea, Republic of)] [Institute of Environmental and Occupational Medicine, Soonchunhyang University 646 Eupnae-ri, Shinchang-myun, Asan-si, Choongnam 336-745 (Korea, Republic of); Kim, Yangho, E-mail: yanghokm@nuri.net [Department of Occupational and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, 290-3 Cheonha-Dong, Dong-Gu, Ulsan 682-060 (Korea, Republic of)] [Department of Occupational and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, 290-3 Cheonha-Dong, Dong-Gu, Ulsan 682-060 (Korea, Republic of)

2011-08-15T23:59:59.000Z

204

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

SciTech Connect

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

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

2012-10-15T23:59:59.000Z

205

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

Science Conference Proceedings (OSTI)

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

206

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

E-Print Network (OSTI)

This thesis provides a detailed evaluation of different environmentally friendly dispersants in invert-emulsion drilling fluids that can be used to drill wells under difficult conditions such as HPHT. The drilling fluid is weighted by manganese tetraoxide (Mn3O4) particles, which have a specific gravity of 4.8 and a mean particle diameter of ca1 micrometers. Manganese tetraoxide has different wetting properties and surface chemistry than other weighting agents. Hence, there is a need to find dispersants for manganese tetraoxide that give reduced sag, reduced rheology, and low fluid-loss at HPHT conditions. This is particularly important for deep wells with narrow operating windows between pore-pressure and fracture pressure gradients. The stricter global environmental regulations mandated the dispersants to be environmentally friendly, e.g. within OCNS group D or E. First, oil compatibility tests and particle settling time experiments were conducted on 31 dispersants. From the experiments, we identified 3 oil-compatible dispersants that gave the longest settling time in base oil and belonged to OCNS group D. We investigated the effectiveness of selected chemicals in dispersing manganese tetraoxide at HPHT conditions. 1.95 and 2.4 S.G. drilling fluid samples were first prepared and tested without any contaminant and then in the presence of rev dust and cement as contaminants. Drilling fluid samples were statically aged at 400 degrees F and 500 psi for 16 hours. Sag and rheological measurements were taken before and after aging to determine the effect of HPHT conditions on fluid properties. Then, HPHT dynamic filtration tests were done at 500 psi differential pressure and 300 degrees F to determine HPHT dynamic fluid-loss. We have found that one of the dispersants (nonionic) gives low rheology and reduced sag before and after static aging. It also gives the lowest fluid-loss of the selected dispersants. For 2.4 S.G. fluid without contaminants, 10-minute gel strength was reduced from 50 to 32 lb/100 ft^2, plastic viscosity from 37 to 25 cp, sag from 0.249 to 0.135 lbm/gal, and fluid-loss was reduced from 44.4 to 39.6 cm^3 with the addition of dispersant. This dispersant prevents agglomeration of particles, thereby reducing fluid rheology, sag, and fluid-loss.

Rehman, Abdul

2011-12-01T23:59:59.000Z

207

Manganese-doped indium oxide and its application in organic light-emitting diodes  

SciTech Connect

Thin films of manganese-doped indium oxide (IMO) deposited by electron beam evaporation have been investigated as anodes in organic light-emitting diodes (OLEDs). The IMO films have a high work function of 5.35 eV, a desirable surface morphology with an average roughness of 1.1 nm, a high average optical transmittance of 87.2% in the visible region, and a maximum optical transmittance of 92% at 460 nm. It is demonstrated that an IMO anode can effectively improve hole injection at the anode/organic interface, resulting in OLEDs with an increased electroluminescent efficiency.

Liao Yaqin [Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033 (China); Graduate School of Chinese Academy of Sciences, Beijing 100080 (China); Lu Qipeng; Fan Yi; Liu Xingyuan [Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033 (China)

2011-07-11T23:59:59.000Z

208

Niobium 1% zirconium/potassium and titanium/potassium life-test heat pipe design and testing  

SciTech Connect

Experimental lifetime performance studies currently in progress use Niobium-1% Zirconium (Nb-1Zr) and Titanium (Ti) heat pipes with potassium (K) as the working fluid. A heat pipe life-test matrix has been developed for testing the heat pipes. Because the corrosion rates in alkali metal heat pipes are affected by temperature and working fluid evaporation flux, the variable parameters of the experimental matrix are established as steady operating temperature and input heat flux density. Total impurity inventory is a factor in corrosion rate so impurity levels are being evaluated in the heat pipe materials before and after testing. Eight Nb-1Zr/K heat pipes were designed, fabricated, and tested. Two of the heat pipes have completed testing whereas the other six are currently in test. These are gravity-assist heat pipes operating in a reflux mode. The heat pipes are tested by sets, one set of two and two sets of three heat pipes. Three Ti/K heat pipes are also in life test. These heat pipes are tested as a set in a horizontal position in a capillary pumped annular flow mode. Each of the heat pipes is encapsulated in a quartz vacuum container with a water calorimeter over the vacuum container for power throughput measurements. Thermocouples are attached to the heat pipes for measuring temperature. Heat input to the heat pipes is via an rf coil. The heat pipes are operating at between 800 and 900 K, with heat input fluxes of 13.8 to 30 W/sq cm. Of the Nb-1Zr/K heat pipes, two of the heat pipes have been in operation for 14,000 hours, three over 10,000 hours, and three over 7,000 hours. The Ti/K heat pipes have been in operation for 1,266 hours. 5 refs., 4 figs., 1 tab.

Sena, J.T.; Merrigan, M.A.

1989-01-01T23:59:59.000Z

209

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 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; Eric Chen; Babatunde Oyenekan; Andrew Sexton; Jason Davis; Marus Hiilliard; Qing Xu; David Van Wagener; Jorge M. Plaza

2006-12-31T23:59:59.000Z

210

Tribology and Tool Wear of Hot Dip Galvanized Zinc Magnesium Alloys on Cold Rolled Steel Sheets  

SciTech Connect

Recently zinc based coatings on cold rolled steel with improved functionality in terms of forming and/or corrosion behaviour have been intensively investigated in the steel industry. One of the most promising products are zinc magnesium alloys produced in hot dip galvanizing process. These coatings were already introduced in construction industry a few years ago. With some modifications the improved properties of the coating are also interesting for automotive industry. In the present work the tribological potential of hot dip galvanized zinc magnesium coatings (HDG/ZM) produced at an industrial line under regular production, was studied in terms of sliding properties, adhesive and abrasive tool wear.First a short introduction into surface morphology of HDG/ZM will be given. For the tribological characterization of the material, which is the main topic of the contribution, different tests were performed on hot dip galvanised zinc magnesium material and results were compared with classic hot dip galvanized zinc coating (HDG/Z). The investigations are mainly based on the strip draw test which allows the determination of the friction coefficient directly by using a constant contact pressure. Deep drawing property was tested by forming model cups. The abrasive tool wear was tested using a standard test for material used in automotive industry. The adhesive tool wear was investigated by characterizing the coating material transferred to the tool in the strip draw test.All performed tests show an improved drawability of HDG/ZM compared to classical HDG/Z reference material. However the most promising difference between HDG/ZM and HDG/Z is that galling was found to be less for HDG/ZM than for HDG/Z. Therefore HDG/ZM is an interesting system not only with respect to corrosion protection but also in terms of tribology and provides clear advantages in formability.

Raab, A. E.; Berger, E.; Freudenthaler, J.; Leomann, F.; Walch, C. [Research and Development, Forming Technology voestalpine Stahl GmbH, Voest-Alpine Strasse 3, 4031 Linz (Austria)

2011-05-04T23:59:59.000Z

211

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 Environmental Protection Agency | Office of Air and Radiation (6608J) | June 2009 http://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

212

Synthesis and characterization of AlPO{sub 4}-36 and MAPO-36 with different magnesium content  

Science Conference Proceedings (OSTI)

The objective of this work was to perform a systematic study regarding the effect of different synthesis parameters on the crystallization of AlPO{sub 4}-36 and MAPO-36 (aluminophosphate molecular sieve type 36, ATS, structure). MAPO-36 samples were synthesized from gels containing different magnesium contents in order to obtain catalysts with different degrees of acidity. Under the synthesis conditions employed in this work, the formation of AlPO{sub 4}-36 and MAPO-36 increased when the reaction mixture was aged at room temperature; however, small amounts of AlPO{sub 4}-5 always crystallize parallel to the ATS materials. The presence of magnesium in the reaction mixture can also favor the formation of the ATS structure; nevertheless, the synthesis of pure MAPO-36 from reaction mixtures having very low magnesium content was not possible under several conditions. Pseudoboehmite was a better aluminum source than aluminum isopropoxide for the formation of MAPO-36. A practically pure ATS structure was obtained from reaction mixtures containing molar fractions of Mg between 0.033 and 0.133. For higher magnesium contents, traces of another unidentified phase were detected. Energy-dispersive spectrometry analysis indicates a uniform chemical composition of the MAPO-36 particles, and Scanning electron microscopy shows that the ATS samples have a needlelike morphology. Thermogravimetric analysis of ATS samples reveals that the weight loss corresponding to the decomposition of protonated amine is linearly correlated with magnesium content in the solid up to 0.8 mmol of magnesium per gram of solid.

Machado, M.S.; Cardoso, D.; Perez-Pariente, J.; Sastre, E.

1999-11-01T23:59:59.000Z

213

Thermodynamics of carbon dioxide in aqueous piperazine/potassium carbonate systems at stripper conditions  

E-Print Network (OSTI)

(Fluka Chemie GmbH, 98.0% pure), K2CO3 (Fluka Chemie GmbH, 99.0% pure), potassium bicarbonate (KHCO3%. Heat of CO2 Absorption A ChemiSens CPA122 reaction calorimeter was used to take direct calorimetric

Rochelle, Gary T.

214

Kinetics and Mechanisms of Potassium Release from Sandy Middle Atlantic Coastal Plain Soils1  

E-Print Network (OSTI)

Kinetics and Mechanisms of Potassium Release from Sandy Middle Atlantic Coastal Plain Soils1 M. C.) grown on these soils did not respond to K applications. The soils contained high levels of total K, and was contained in the sand fractionsof the soils. Kineticsof K release from the whole soils and from the coarse

Sparks, Donald L.

215

Solvent Reclaiming by Crystallization of Potassium Sulfate Qing Xu, B. S.  

E-Print Network (OSTI)

the cost and solve other problems in the existing reclaiming processes. The solubility of potassium sulfate balance was studied and energy and chemical costs were estimated under one case. The total cost is about at Austin for equipment using in his lab, Dr. Chau- Chyun Chen in Aspen Technology Inc. for his help

Rochelle, Gary T.

216

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

217

Electrochemical impedance spectroscopy studies of lithium diffusion in doped manganese oxide  

DOE Green Energy (OSTI)

Cathode performance is critical to lithium ion rechargeable battery performance; effects of doping lithium manganese oxide cathode materials on cathode performance are being investigated. In this paper, Li diffusion in Al-doped LiMn{sub 2}O{sub 4} was studied and found to be controlled by the quantity of Al dopant. Electrochemical cycling was conducted at 0.5mA/cm{sub 2}; electrochemical impedance spectra were taken at open circuit potential, with impedance being measured at 65 kHz-0.01 Hz. As the Al dopant level was increased, the Li diffusion rate decreased; this was attributed to the decreased lattice parameter of the doped oxide.

Johnson, B.J.; Doughty, D.H.; Voigt, J.A.; Boyle, T.J.

1996-06-01T23:59:59.000Z

218

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

Science Conference Proceedings (OSTI)

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

Bak, S.B.

2009-08-01T23:59:59.000Z

219

Friction Stir Lap Welding of Magnesium Alloy to Steel: A Preliminary Investigation  

Science Conference Proceedings (OSTI)

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

220

Adsorption of Potassium on the MoS2(100) Surface: A First-Principles Investigation  

DOE Green Energy (OSTI)

Periodic density functional theory calculations were performed to investigate the interaction that potassium with the Mo and S edges of the MoS2(100) surface. Both neutral and cationic (+1) charged potassium-promoted systems at different sulfur coverages were considered. Our calculations indicate that the potassium atom readily donates its single 4s valence electron to the MoS2 structure for the neutral potassium-promoted system, and the neutral and cationic potassium-promoted systems demonstrate a similar adsorption behavior. Moreover, potassium changes the magnetic properties known to occur at the metallic edge surface, which have implications for electron spin dependent surface characterization methods (i.e., electron spin/paramagnetic spectroscopy). Potassium in both the neutral and cationic systems tends to maximize its interactions with the available sulfur atoms at the edge surface, preferring sites over four-fold S hollows on fully sulfided Mo and S edges and over the interstitial gap where two to four edge surface S atoms are available for coordination. As the potassium coverage increases, the adsorption energy per potassium atom, surface work function, and transfer of the K 4s electron to the MoS2(100) surface decreases, which is in line with an increased metallization of the potassium adlayer. The potassium adlayer tends to form chains along the interstitial with K-K distances ~1 Å, which is notably less than those of bulk bcc K metal (4.61 Å). Density of states for the potassium-saturated surface suggests enhanced involvement of broad K 3d states beginning just above the Fermi level. Potassium-promotion of MoS2(100) has implications for alcohol catalysis: increasing the surface basicity by increasing the electron charge of the surface, providing hydrogenation-promoting CO site, blocking edge surface that dissociate CO and lead to methanation, and limiting H2 dissociative adsorption to the edge surface and possibly inhibiting the H2 dissociative adsorption via s character electron repulsion. This research was performed in part using the Molecular Science Computing Facility in the William R. Wiley Environmental Molecular Sciences Laboratory, a U.S. Department of Energy (DOE) national scientific user facility located at the Pacific Northwest National Laboratory (PNNL). PNNL is operated by Battelle for DOE.

Andersen, Amity; Kathmann, Shawn M.; Lilga, Michael A.; Albrecht, Karl O.; Hallen, Richard T.; Mei, Donghai

2011-04-15T23:59:59.000Z

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.


221

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

SciTech Connect

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

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

2013-05-20T23:59:59.000Z

222

Magnesium (Mg)  

Science Conference Proceedings (OSTI)

...J.L. Bernard, R. Caillat, and R. Darras, Progress in Nuclear Energy, Metallurgy and Fuels, Vol 2, Pergamon

223

The optical properties of magnesium oxide containing transition metal ions and defects produced by fast neutron irradiation  

Science Conference Proceedings (OSTI)

The photoluminescence (PL), its excitation (PLE) and optical absorption of MgO crystals containing transition metal ions and defects produced by fast neutron irradiation fluence up to 1020cm-2 (E>0.1 MeV) are investigated. Three ... Keywords: absorption, luminescence spectra, magnesium oxide, radiation defect, transition metal ions

Vera Skvortsova; Laima Trinkler

2010-11-01T23:59:59.000Z

224

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.

2011-10-01T23:59:59.000Z

225

Overview of DOE'S programs on aluminum and magnesium for automotive application  

DOE Green Energy (OSTI)

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

226

Elastic Properties and Internal Friction of Two Magnesium Alloys at Elevated Temperatures  

SciTech Connect

The elastic properties and internal friction of two magnesium alloys were studied from 25 C to 450 C using Resonant Ultrasound Spectroscopy (RUS). The Young's moduli decrease with increasing temperature. At 200 C, a change in the temperature dependence of the elastic constants is observed. The internal friction increases significantly with increasing temperature above 200 C. The observed changes in the temperature dependence of the elastic constants and the internal friction are the result of anelastic relaxation by grain boundary sliding at elevated temperatures. Elastic properties govern the behavior of a materials subjected to stress over a region of strain where the material behaves elastically. The elastic properties, including the Young's modulus (E), shear modulus (G), bulk modulus (B), and Poisson's ratio (?), are of significant interest to many design and engineering applications. The choice of the most appropriate material for a particular application at elevated temperatures therefore requires knowledge of its elastic properties as a function of temperature. In addition, mechanical vibration can cause significant damage in the automotive, aerospace, and architectural industries and thus, the ability of a material to dissipate elastic strain energy in materials, known as damping or internal friction, is also important property. Internal friction can be the result of a wide range of physical mechanisms, and depends on the material, temperature, and frequency of the loading. When utilized effectively in engineering applications, the damping capacity of a material can remove undesirable noise and vibration as heat to the surroundings. The elastic properties of materials can be determined by static or dynamic methods. Resonant Ultrasound Spectroscopy (RUS), used in this study, is a unique and sophisticated non-destructive dynamic technique for determining the complete elastic tensor of a solid by measuring the resonant spectrum of mechanical resonance for a sample of known geometry, dimensions, and mass. In addition, RUS allows determination of internal friction, or damping, at different frequencies and temperatures. Polycrystalline pure magnesium (Mg) exhibits excellent high damping properties. However, the poor mechanical properties limit the applications of pure Mg. Although alloying can improve the mechanical properties of Mg, the damping properties are reduced with additions of alloying elements. Therefore, it becomes necessary to study and develop Mg-alloys with simultaneous high damping capacity and improved mechanical properties. Moreover, studies involving the high temperature dynamic elastic properties of Mg alloys are limited. In this study, the elastic properties and internal friction of two magnesium alloys were studied at elevated temperatures using RUS. The effect of alloy composition and grain size was investigated. The wrought magnesium alloys AZ31 and ZK60 were employed. Table 1 gives the nominal chemical compositions of these two alloys. The ZK60 alloy is a commercial extruded plate with a T5 temper, i.e. solution-treated at 535 C for two hours, quenched in hot water, and aged at 185 C for 24 hours. The AZ31 alloy is a commercial rolled plate with a H24 temper, i.e. strain hardened and partially annealed.

Freels, M.; Liaw, P. K.; Garlea, E.; Morrell, J. S.; Radiovic, M.

2011-06-01T23:59:59.000Z

227

Analysis of the potential for new automotive uses of wrought magnesium  

DOE Green Energy (OSTI)

The Center for Transportation Research at Argonne National Laboratory has performed a study for the Lightweight Materials Program within the US Department of Energy`s Office of Transportation Materials to evaluate the suitability of wrought magnesium and its alloys to replace steel or aluminum for automotive structural and sheet applications. Vehicle weight reduction is one of the major means available for improving automotive fuel efficiency. Although high-strength steels, Al, and polymers are already being used to achieve significant weight reductions, substantial additional weight reductions could be achieved by increased use of Mg (whose density is less than one-fourth that of steel and only two-thirds that of Al). This study shows that Mg sheet could be used in automotive body nonstructural and semistructural applications, whereas extrusions could be used in such structural applications as spaceframes. The primary barrier to such uses of wrought Mg is high cost.

Gaines, L.; Cuenca, R.; Wu, S. [Argonne National Lab., IL (United States); Stodolsky, F. [Argonne National Lab., IL (United States)]|[Argonne National Lab., Washington, DC (United States)

1996-02-01T23:59:59.000Z

228

A study of start-up characteristics of a potassium heat pipe from the frozen state  

SciTech Connect

The start-up characteristics of a potassium heat pipe were studied both analytically and experimentally. Using the radiation heat transfer mode the heat pipe was tested in a vacuum chamber. The transition temperature calculated for potassium was then compared with the experimental results of the heat pipe with various heat inputs. These results show that the heat pipe was inactive until it reached the transition temperature. In addition, during the start-up period, the evaporator experienced dry-out with a heat input smaller than the capillary limit calculated at the steady state. However, when the working fluid at the condenser was completely melted, the evaporator was rewetted without external aid. The start-up period was significantly reduced with a large heat input.

Jang, J.H.

1992-04-01T23:59:59.000Z

229

Multi-Objective Optimization of a Wrought Magnesium Alloy for High Strength and Ductility  

Science Conference Proceedings (OSTI)

An optimization technique is coupled with crystal plasticity based finite element (CPFE) computations to aid the microstructural design of a wrought magnesium alloy for improved strength and ductility. The initial microstructure consists of a collection of sub-micron sized grains containing deformation twins. The variables used in the simulations are crystallographic texture, and twin spacing within the grains. It is assumed that plastic deformation occurs mainly by dislocation slip on two sets of slip systems classified as hard and soft modes. The hard modes are those slip systems that are inclined to the twin planes and the soft mode consists of dislocation glide along the twin plane. The CPFE code calculates the stress-strain response of the microstructure as a function of the microstructural parameters and the length-scale of the features. A failure criterion based on a critical shear strain and a critical hydrostatic stress is used to define ductility. The optimization is based on the sequential generation of an initial population defined by the texture and twin spacing variables. The CPFE code and the optimizer are coupled in parallel so that new generations are created and analyzed dynamically. In each successive generation, microstructures that satisfy at least 90% of the mean strength and mean ductility in the current generation are retained. Multiple generation runs based on the above procedure are carried out in order to obtain maximum strength-ductility combinations. The implications of the computations for the design of a wrought magnesium alloy are discussed. Research sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U. S. Department of Energy.

Radhakrishnan, Balasubramaniam [ORNL; Gorti, Sarma B [ORNL; Patton, Robert M [ORNL; Simunovic, Srdjan [ORNL

2013-01-01T23:59:59.000Z

230

Coal Tar Treatability Test Program: Chemical Oxidation Effects on Dense Non-Aqueous Phase Liquid Using Potassium Permanganate  

Science Conference Proceedings (OSTI)

EPRI has initiated a progressive program to investigate the effectiveness of using potassium permanganate to mitigate the impact of coal tar on groundwater at former manufactured gas plant (MGP) sites. This study evaluated the effectiveness of using potassium permanganate to reduce the rate of dissolution of chemical constituents present in coal-tar-derived dense non-aqueous phase liquid (DNAPL) into the surrounding groundwater. The focus of the research was 1) to develop a proof of concept for using pot...

2004-03-31T23:59:59.000Z

231

CO{sub 2} absorption using dry potassium-based sorbents with different supports  

SciTech Connect

The CO{sub 2} capture characteristics of dry potassium-based sorbents were investigated with thermogravimetric analysis (TGA) and a bubbling fluidized-bed reactor. Potassium-based sorbents were prepared by impregnation with potassium carbonate on supports such as coconut activated charcoal (AC1), coal active carbon (AC2), silica gel (SG), and activated alumina (Al{sub 2}O{sub 3}). Sorbents such as K{sub 2}CO{sub 3}/AC1, K{sub 2}CO{sub 3}/AC2, and K{sub 2}CO{sub 3}/Al{sub 2}O{sub 3} showed excellent carbonation capacity; The total conversion rates of those sorbents were 97.2, 95.9, and 95.2%, respectively in the TG test, and 89.2, 87.9, and 87.6%, respectively, in the fluidized-bed test. However, K{sub 2}CO{sub 3}/SG showed poor carbonation capacity, the total conversion rates were only 34.5 and 18.8%, respectively, in TG and fluidized-bed tests. The differences in carbonation capacity of those sorbents were analyzed by studying the microscopic structure and crystal structure of the supports and the sorbents with X-ray diffraction, scanning electron microscopy, and N{sub 2} adsorption tests. 23 refs., 10 figs.

Chuanwen Zhao; Xiaoping Chen; Changsui Zhao [Southeast University, Nanjing (China). China School of Energy and Environment

2009-09-15T23:59:59.000Z

232

Manganese Doping of Magnetic Iron Oxide Nanoparticles: Tailoring Surface Reactivity for a Regenerable Heavy Metal Sorbent  

SciTech Connect

A method for tuning the analyte affinity of magnetic, inorganic nanostructured sorbents for heavy metal contaminants is described. The manganese-doped iron oxide nanoparticle sorbents have a remarkably high affinity compared to the precursor material. Sorbent affinity can be tuned toward an analyte of interest simply by adjustment of the dopant quantity. The results show that following the Mn doping process there is a large increase in affinity and capacity for heavy metals (i.e., Co, Ni, Zn, As, Ag, Cd, Hg, and Tl). Capacity measurements were carried out for the removal of cadmium from river water and showed significantly higher loading than the relevant commercial sorbents tested for comparison. The reduction in Cd concentration from 100 ppb spiked river water to 1 ppb (less than the EPA drinking water limit of 5 ppb for Cd) was achieved following treatment with the Mn-doped iron oxide nanoparticles. The Mn-doped iron oxide nanoparticles were able to load 1 ppm of Cd followed by complete stripping and recovery of the Cd with a mild acid wash. The Cd loading and stripping is shown to be consistent through multiple cycles with no loss of sorbent performance.

Warner, Cynthia L.; Chouyyok, Wilaiwan; Mackie, Katherine E.; Neiner, Doinita; Saraf, Laxmikant; Droubay, Timothy C.; Warner, Marvin G.; Addleman, Raymond S.

2012-02-28T23:59:59.000Z

233

Solar-thermal Water Splitting Using the Sodium Manganese Oxide Process & Preliminary H2A Analysis  

DOE Green Energy (OSTI)

There are three primary reactions in the sodium manganese oxide high temperature water splitting cycle. In the first reaction, Mn2O3 is decomposed to MnO at 1,500°C and 50 psig. This reaction occurs in a high temperature solar reactor and has a heat of reaction of 173,212 J/mol. Hydrogen is produced in the next step of this cycle. This step occurs at 700°C and 1 atm in the presence of sodium hydroxide. Finally, water is added in the hydrolysis step, which removes NaOH and regenerates the original reactant, Mn2O3. The high temperature solar�driven step for decomposing Mn2O3 to MnO can be carried out to high conversion without major complication in an inert environment. The second step to produce H2 in the presence of sodium hydroxide is also straightforward and can be completed. The third step, the low temperature step to recover the sodium hydroxide is the most difficult. The amount of energy required to essentially distill water to recover sodium hydroxide is prohibitive and too costly. Methods must be found for lower cost recovery. This report provides information on the use of ZnO as an additive to improve the recovery of sodium hydroxide.

Todd M. Francis, Paul R. Lichty, Christopher Perkins, Melinda Tucker, Peter B. Kreider, Hans H. Funke, Allan Lewandowski, and Alan W. Weimer

2012-10-24T23:59:59.000Z

234

Lithium/Manganese Dioxide (Li/MnO(2)) Battery Performance Evaluation: Final Report  

DOE Green Energy (OSTI)

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

235

Layered manganese oxide intergrowth electrodes for rechargeable lithium batteries: Part 1-substitution with Co or Ni  

DOE Green Energy (OSTI)

Lithium manganese oxides substituted with nickel or cobalt were characterized electrochemically in lithium cell configurations. The compounds studied were either single-phase layered structures with either primarily O2 or O3 stacking arrangements, or O2/O3 intergrowths, prepared from P2, P3 and P2/P3 sodium-containing precursors, respectively. The stacking arrangements are extremely sensitive to the Na/T. M. (T. M. = transition metal) ratios and the level of substitution. Phase diagrams showing the stability regions of the various arrangements for the Na-Ni-Mn-O system are presented. A possible correlation between vacancies and electrochemical performance is suggested. For high levels of substitution with Ni, fewer defects are possible for materials containing more O3 component and higher discharge capacities can be achieved, but spinel conversion upon cycling also occurs more rapidly as the O3 content increases. Intergrowths show intermediate behavior and represent a potential route towards designing stable, high capacity electrodes.

Dolle, Mickael; Patoux, Sebastien; Doeff, Marca M.

2004-09-08T23:59:59.000Z

236

Current Efficiency Predictive Model and Its Calibration and Validation  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

237

Modelling  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

238

Latest Results from PFC Investigation in China  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

239

Anodic Electrochemical Behavior in Low Alumina Concentration ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

240

Electrolytic Cell Gas Cooling Upstream of Treatment Center  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

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

Current Distribution and Lorentz Field Modelling Using Cathode ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

242

Busbar Displacement Study of Aluminum Reduction Cell  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

243

DX+, An Optimized Version of DX Technology  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

244

Impacts of Anode Set on the Energy Re-distribution of PB Aluminum ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

245

Pot-Shell Exfoliation behind SiC Sidewall Block in a Cathode of ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

246

Numerical Simulation on Coupled Multi-field of the Perforated ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

247

Impurity Elements in Raw Gas Ultra-Fines from Aluminum ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

248

Method for Testing Thermal Properties of Reduction Cell Materials  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

249

Visualising the Sources of Potroom Dust in Aluminium Smelters  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

250

Operating Parameters of Aluminum Electrolysis in a KF-AlF 3 Based ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

251

The Restart of Two Idled Pot Lines at Ormet Primary Aluminum  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

252

AP40  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

253

Prebake Potline Restart after Power Supply Interruption  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

254

About this Abstract  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

255

Electromagnetic and MHD Study to Improve Cell Performance of an ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

256

Air Amplified Boosted Suction (AABS) System for Pot Flow Control ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

257

Virtual Pot Simulator for aluminum smelting  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

258

Applying Nano Technology to Remove Toxic Sulfur Gases ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

259

Statistical Method to Predict Anode Effect Events  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

260

Two-Phase 3D Model of Reduction Cell  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

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

Thermo-Electro-Mechanical Investigation of Voltage Drop on Anode ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

262

CFD Simulation of Anode Bubble Behavior in Aluminum Reduction ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

263

Liquidus Temperatures of the System Na  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

264

The Study and Applications of Modern Potline Fume Treatment Plant ...  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

265

Behavior Estimation and Control of Aluminum Reduction Cell  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

266

Update on the Development of D18 Cell Technology at Dubal  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

267

Studies of Perfluorocarbon Formation on Anodes in Cryolite Melts  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

268

Optimization of the Thermal Management in Aluminum Smelting Pot  

Science Conference Proceedings (OSTI)

Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride · Current Distribution and ...

269

Energy and Technolgy Assessment of Zinc and Magnesium Casting Plants, Technical Report Close-out, August 25,2006  

Science Conference Proceedings (OSTI)

Twin City Die Castings Company of Minneapolis, Minnesota, Twin City Die Castings Company was awarded project No. DE-FG36-05GO15097 to perform plant wide assessments of ten (10) die casting facilities that produce zinc and magnesium alloy castings in order to determine improvements and potential cost savings in energy use. Mr. Heider filled the role of team leader for the project and utilized the North American Die Casting Association (NADCA) to conduct audits at team participant plants so as to hold findings specific to each plant proprietary. The intended benefits of the project were to improve energy use through higher operational and process efficiency for the plants assessed. An improvement in energy efficiency of 5 – 15% was targeted. The primary objectives of the project was to: 1) Expand an energy and technology tool developed by the NADCA under a previous DOE project titled, “Energy and Technology Assessment for Die Casting Plants” for assessing aluminum die casting plants to be more specifically applicable to zinc and magnesium die casting facilities. 2) Conduct ten (10) assessments of zinc and magnesium die casting plants, within eight (8) companies, utilizing the assessment tool to identify, evaluate and recommend opportunities to enhance energy efficiency, minimize waste, and improve productivity. 3) Transfer the assessment tool to the die casting industry at large.

Twin City Die Castings Company; Tom Heider; North American Die Castings Association

2006-08-25T23:59:59.000Z

270

Chemical and structural investigations of the incorporation of metal manganese into ruthenium thin films for use as copper diffusion barrier layers  

Science Conference Proceedings (OSTI)

The incorporation of manganese into a 3 nm ruthenium thin-film is presented as a potential mechanism to improve its performance as a copper diffusion barrier. Manganese ({approx}1 nm) was deposited on an atomic layer deposited Ru film, and the Mn/Ru/SiO{sub 2} structure was subsequently thermally annealed. X-ray photoelectron spectroscopy studies reveal the chemical interaction of Mn with the SiO{sub 2} substrate to form manganese-silicate (MnSiO{sub 3}), implying the migration of the metal through the Ru film. Electron energy loss spectroscopy line profile measurements of the intensity of the Mn signal across the Ru film confirm the presence of Mn at the Ru/SiO{sub 2} interface.

McCoy, A. P.; Casey, P.; Bogan, J.; Hughes, G. [School of Physical Sciences, Dublin City University, Dublin 9 (Ireland); Lozano, J. G.; Nellist, P. D. [Department of Materials, University of Oxford, Oxford OX1 3PH (United Kingdom)

2012-12-03T23:59:59.000Z

271

Kinetics and mechanism of the potassium-catalyzed carbon/carbon dioxide gasification  

SciTech Connect

The catalytic effect of potassium on the rate of CO/sub 2/ gasification of a bituminous coal char and a pure carbon substrate is investigated. The gasification rate depends on both the catalyst concentration (K/C atomic ratio) and the internal porous structure of the solid. For low values of the K/C atomic ratio, the initial gasification rate increases sharply with the addition of catalyst; at higher values, the rate profile levels off. The sharp increase in rate is due to the activation of reaction sites while the plateau is attributed to the saturation of the surface with active sites. The variation of the instantaneous gasification rate (based on remaining carbon) with carbon conversion at various initial K/C ratios is studied. The important reasons for the change in rate are the change in the solid surface area, the loss of active sites, the loss of catalyst by vaporization and the change in the K/C ratio due to carbon depletion. The loss of catalyst from the pure carbon substrate by vaporization is also determined. Temperature programmed experiments show that under inert atmospheres, both KOH and K/sub 2/CO/sub 3/ react with carbon to give a reduced form of the catalyst which appears to be a prerequisite for the rapid vaporization of potassium. The effect of catalyst loss on both the initial gasification rate and the variation in rate with conversion is determined. The proposed redox mechanism contains three surface complexes: -CO/sub 2/K, -COK and -CK. The oxide groups are the intermediates during C/CO/sub 2/ gasification. The completely reduced form, -CK, is the end product of catalyst reduction and is the precursor for K loss. The stoichiometries of these surface groups are confirmed by oxygen and potassium balance.

Sams, D.A.

1985-01-01T23:59:59.000Z

272

Manganese trends in a sample of thin and thick disk stars. The origin of Mn  

E-Print Network (OSTI)

CONTEXT: Manganese is an iron-peak element and although the nucleosynthesis path that leads to its formation is fairly well understood, it remains unclear which objects, SN II and/or SN Ia, that contribute the majority of Mn to the interstellar medium. It also remains unclear to which extent the supernovae Mn yields depend on the metallicity of the progenitor star or not. AIMS: By using a well studied and well defined sample of 95 dwarf stars we aim at further constraining the formation site(s) of Mn. METHODS: We derive Mn abundances through spectral synthesis of four Mn I lines at 539.4, 549.2, 601.3, and 601.6 nm. Stellar parameters and data for oxygen are taken from Bensby et al. (2003, 2004, 2005). RESULTS: When comparing our Mn abundances with O abundances for the same stars we find that the abundance trends in the stars with kinematics of the thick disk can be explained by metallicity dependent yields from SN II. We go on and combine our data for dwarf stars in the disks with data for dwarf and giant stars in the metal-poor thick disk and halo from the literature. We find that dwarf and giant stars show the same trends, which indicates that neither non-LTE nor evolutionary effects are a major concern for Mn. Furthermore, the [Mn/O] vs [O/H] trend in the halo is flat. CONCLUSIONS: We conclude that the simplest interpretation of our data is that Mn is most likely produced in SN II and that the Mn yields for such SNae must be metallicity dependent. Contribution from SN Ia in the metal-rich thin disk can not, however, be excluded.

S. Feltzing; M. Fohlman; T. Bensby

2007-03-19T23:59:59.000Z

273

Stability Behavior and Thermodynamic States of Iron and Manganese in Sandy Soil Aquifer, Manukan Island, Malaysia  

Science Conference Proceedings (OSTI)

A total of 20 soil samples were collected from 10 boreholes constructed in the low lying area, which included ancillary samples taken from the high elevation area. Redox processes were investigated in the soil as well as groundwater in the shallow groundwater aquifer of Manukan Island, Sabah, Malaysia. Groundwater samples (n = 10) from each boreholes were also collected in the low lying area to understand the concentrations and behaviors of Fe and Mn in the dissolved state. This study strives to obtain a general understanding of the stability behaviors on Fe and Mn at the upper unsaturated and the lower-saturated soil horizons in the low lying area of Manukan Island as these elements usually play a major role in the redox chemistry of the shallow groundwater. Thermodynamic calculations using PHREEQC showed that the groundwater samples in the study area are oversaturated with respect to goethite, hematite, Fe(OH){sub 3} and undersaturated with respect to manganite and pyrochroite. Low concentrations of Fe and Mn in the groundwater might be probably due to the lack of minerals of iron and manganese oxides, which exist in the sandy aquifer. In fact, high organic matters that present in the unsaturated horizon are believed to be responsible for the high Mn content in the soil. It was observed that the soil samples collected from high elevation area (BK) comprises considerable amount of Fe in both unsaturated (6675.87 mg/kg) and saturated horizons (31440.49 mg/kg) compared to the low Fe content in the low lying area. Based on the stability diagram, the groundwater composition lies within the stability field for Mn{sup 2+} and Fe{sup 2+} under suboxic condition and very close to the FeS/Fe{sup 2+} stability boundary. This study also shows that both pH and Eh values comprise a strong negative value thus suggesting that the redox potential is inversely dependent on the changes of pH.

Lin, Chin Yik, E-mail: cy_lin_ars@hotmail.com [Universiti Malaysia Sabah, School of Science and Technology (Malaysia); Abdullah, Mohd. Harun [Universiti Malaysia Sabah, Water Research Unit, School of Science and Technology (Malaysia); Musta, Baba; Praveena, Sarva Mangala [Universiti Malaysia Sabah, School of Science and Technology (Malaysia); Aris, Ahmad Zaharin [Universiti Putra Malaysia, Faculty of Environmental Studies (Malaysia)

2011-03-15T23:59:59.000Z

274

Theoretical study of sodium and potassium resonance lines pressure broadened by helium atoms  

SciTech Connect

We perform fully quantum mechanical calculations in the binary approximation of the emission and absorption profiles of the sodium 3s-3p and potassium 4s-4p resonance lines under the influence of a helium perturbing gas. We use carefully constructed potential energy surfaces and transition dipole moments to compute the emission and absorption coefficients at temperatures from 158 to 3000 K. Contributions from quasibound states are included. The resulting red and blue wing profiles agree well with previous theoretical calculations and with experimental measurements.

Zhu, Cheng; Babb, James F.; Dalgarno, Alex [ITAMP, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)

2006-01-15T23:59:59.000Z

275

Transient Heat and Material Flow Modeling of Friction Stir Processing of Magnesium Alloy using Threaded Tool  

SciTech Connect

A three-dimensional transient computational fluid dynamics (CFD) model was developed to investigate the material flow and heat transfer during friction stir processing (FSP) in an AZ31B magnesium alloy. The material was assumed to be a non-Newtonian viscoplastic fluid, and the Zener-Hollomon parameter was used to describe the dependence of material viscosity on temperature and strain rate. The material constants used in the constitutive equation were determined experimentally from compression tests of the AZ31B Mg alloy under a wide range of strain rates and temperatures. A dynamic mesh method, combining both Lagrangian and Eulerian formulations, was used to capture the material flow induced by the movement of the threaded tool pin. Massless inert particles were embedded in the simulation domain to track the detailed history of material flow. The actual FSP was also carried out on a wrought Mg plate where temperature profiles were recorded by embedding thermocouples. The predicted transient temperature history was found to be consistent with that measured during FSP. Finally, the influence of the thread on the simulated results of thermal history and material flow was studied by comparing two models: one with threaded pin and the other with smooth pin surface.

Yu, Zhenzhen [ORNL; Zhang, Wei [ORNL; Choo, Hahn [ORNL; Feng, Zhili [ORNL

2012-01-01T23:59:59.000Z

276

Plutonium and americium recovery from spent molten-salt-extraction salts with aluminum-magnesium alloys  

Science Conference Proceedings (OSTI)

Development work was performed to determine the feasibility of removing plutonium and americium from spent molten-salt-extraction (MSE) salts using Al-Mg alloys. If the product buttons from this process are compatible with subsequent aqueous processing, the complex chloride-to-nitrate aqueous conversion step which is presently required for these salts may be eliminated. The optimum alloy composition used to treat spent 8 wt % MSE salts in the past yielded poor phase-disengagement characteristics when applied to 30 mol % salts. After a limited investigation of other alloy compositions in the Al-Mg-Pu-Am system, it was determined that the Al-Pu-Am system could yield a compatible alloy. In this system, experiments were performed to investigate the effects of plutonium loading in the alloy, excess magnesium, age of the spent salt on actinide recovery, phase disengagement, and button homogeneity. Experimental results indicate that 95 percent plutonium recoveries can be attained for fresh salts. Further development is required for backlog salts generated prior to 1981. A homogeneous product alloy, as required for aqueous processing, could not be produced.

Cusick, M.J.; Sherwood, W.G.; Fitzpatrick, R.F.

1984-04-23T23:59:59.000Z

277

Polymer Stable Magnesium Nanocomposites Prepared by Laser Ablation for Efficient Hydrogen Storage  

E-Print Network (OSTI)

Hydrogen is a promising alternative energy carrier that can potentially facilitate the transition from fossil fuels to sources of clean energy because of its prominent advantages such as high energy density (142 MJ per kg), great variety of potential sources (for example water, biomass, organic matter), and low environmental impact (water is the sole combustion product). However, due to its light weight, the efficient storage of hydrogen is still an issue investigated intensely. Various solid media have been considered in that respect among which magnesium hydride stands out as a candidate offering distinct advantages. Recent theoretical work indicates that MgH2 becomes less thermodynamically stable as particle diameter decreases below 2 nm. Our DFT (density functional theory) modeling studies have shown that the smallest enthalpy change, corresponding to 2 unit-cell thickness (1.6 {\\AA} Mg/3.0{\\AA} MgH2) of the film, is 57.7 kJ/molMg. This enthalpy change is over 10 kJ per molMg smaller than that of the bulk...

Makridis, S S; Panagakos, G; Kikkinides, E S; Stubos, A K; Wagener, P; Barcikowski, S

2013-01-01T23:59:59.000Z

278

Chemical and mechanical consequences of environmental barrier coating exposure to calcium-magnesium-aluminosilicate.  

Science Conference Proceedings (OSTI)

The success of Si-based ceramics as high-temperature structural materials for gas turbine applications relies on the use of environmental barrier coatings (EBCs) with low silica activity, such as Ba{sub 1-x}Sr{sub x}Al{sub 2}Si{sub 2}O{sub 8} (BSAS), which protect the underlying components from oxidation and corrosion in combustion environments containing water vapor. One of the current challenges concerning EBC lifetime is the effect of sandy deposits of calcium-magnesium-aluminosilicate (CMAS) glass that melt during engine operation and react with the EBC, changing both its composition and stress state. In this work, we study the effect of CMAS exposure at 1300 C on the residual stress state and composition in BSAS-mullite-Si-SiC multilayers. Residual stresses were measured in BSAS multilayers exposed to CMAS for different times using high-energy X-ray diffraction. Their microstructure was studied using a combination of scanning electron microscopy and transmission electron microscopy techniques. Our results show that CMAS dissolves the BSAS topcoat preferentially through the grain boundaries, dislodging the grains and changing the residual stress state in the topcoat to a nonuniform and increasingly compressive stress state with increasing exposure time. The presence of CMAS accelerates the hexacelsian-to-celsian phase transformation kinetics in BSAS, which reacts with the glass by a solution-reprecipitation mechanism. Precipitates have crystallographic structures consistent with Ca-doped celsian and Ba-doped anorthite.

Harder, B.; Ramirez-Rico, J.; Almer, J. D.; Kang, L.; Faber, K. (X-Ray Science Division); (NASA Glenn Research Center); (Univ. of Seville); (Rolls-Royce Corp.); (Northwestern Univ.)

2011-06-01T23:59:59.000Z

279

Anisotropic compression of a synthetic potassium aluminogermanate zeolite with gismondine topology  

Science Conference Proceedings (OSTI)

Compression behavior of a potassium aluminogermanate with a gismondine framework topology (K-AlGe-GIS) was studied using in-situ high-pressure synchrotron X-ray powder diffraction. In contrast to the potassium gallosilicate analogue (K-GaSi-GIS), no elastic anomaly due to pressure-induced hydration and/or cation relocation was observed in K-AlGe-GIS. The Birch-Murnaghan fit to the pressure-volume data results in a bulk modulus of B{sub 0} = 31(1) GPa. The derived linear-axial compressibilities (i.e., {beta}{sub a} = 0.0065(5) GPa{sup -1}, {beta}{sub b} = 0.0196(4) GPa{sup -1}, {beta}{sub c} = 0.0081(7) GPa{sup -1}) indicate that the b-axis, normal to the 8-ring channels, is about three times more compressible than the a and c axes, parallel to the elliptical 8-ring channels. As a consequence a gradual flattening of the so-called 'double crankshaft' structural building units of the gismondine framework is observed. In K-AlGe-GIS, this flattening occurs almost linear with pressure, whereas it is nonlinear in the GaSi-analogue due to structural changes of the water-cation assembly under hydrostatic pressures.

Jang, Y.N.; Kao, C.; Vogt, T.; Lee, Y.

2010-08-01T23:59:59.000Z

280

Electrodeposited Manganese Oxides on Three-Dimensional Carbon Nanotube Substrate: Supercapacitive Behaviour in Aqueous and Organic Electrolytes  

Science Conference Proceedings (OSTI)

Thin amorphous manganese oxide layers with a thickness of 3-5nm are electrodeposited on a carbon nanotube (CNT) film substrate that has a three-dimensional nanoporous structure (denoted asMnO2/CNT electrode). For the purpose of comparison, manganese oxide films are also electrodeposited on a flat Pt-coated Si wafer substrate (denoted as MnO2 film electrode). The pseudocapacitive properties of the MnO2 film and MnO2/CNT electrodes are examined in both aqueous electrolyte (1.0M KCl) and nonaqueousorganic electrolyte (1.0M LiClO4 in propylene carbonate). While both types of electrode showpseudocapacitive behaviour in the aqueous electrolyte, only the MnO2/CNT electrode does so in the organic electrolyte, due to its high oxide/electrolyte interfacial area and improved electron conduction through the CNT substrate. Compared with the MnO2 film electrode, the MnO2/CNT electrode shows a much higher specific capacitance and better high-rate capability, regardless of the electrolyte used.Use of the organic electrolyte results in a ?6 times higher specific energy compared with that obtained with the aqueous electrolyte, while maintaining a similar specific power. The construction of a threedimensional nanoporous network structure consisting of a thin oxide layer on a CNT film substrate at the nm scale and the use of an organic electrolyte are promising approaches to improving the specific energyof supercapacitors.

Nam,K.W.; Yang,X.

2009-03-01T23:59:59.000Z

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

Removal of Filter Cake Generated by Manganese Tetraoxide Water-based Drilling Fluids  

E-Print Network (OSTI)

Three effective solutions to dissolve the filter cake created by water-based drilling fluids weighted with Mn3O4 particles were developed. Hydrochloric acid at concentration lower than 5 wt% can dissolve most of Mn3O4-based filter cake. Dissolving the filter cake in two-stage treatment of enzyme and organic acid was effective and eliminated the associated drawbacks of using HCl. Finally, combining low and safe concentration of HCl with an organic acid in one-stage treatment was very effective. Hydrochloric acid (10-wt%) dissolved 78 wt% of Mn3O4-based filter cake at 250°F after 28 hours soaking time. However, Chlorine gas was detected during the reaction of 5 to 15-wt% HCl with Mn3O4 particles. At 190°F, 1- and 4-wt% HCl dissolved most Mn3O4 particles (up to 70-wt% solubility). Their reactions with Mn3O4 particles followed Eq. 8 at 190°F, which further confirmed the absence of chlorine gas production at HCl concentrations lower than 5-wt%. EDTA and DTPA at high pH (12) and acetic, propionic, butyric, and gluconic acids at low pH (3-5) showed very low solubilities of Mn3O4 particles. GLDA, citric, oxalic, and tartaric acids produced large amount of white precipitation upon the reactions with Mn3O4 particles. Similarly, DTPA will produce damaging material if used to dissolve Mn3O4-based filter cake in sandstone formation. At 4-wt% acid concentration, lactic, glycolic, and formic acids dissolved Mn3O4 particles up to 76 wt% solubility at 190°F. Malonic acid at lower concentration (2-wt%) dissolved 54 wt% of Mn3O4 particles at 190°F. Manganese tetraoxide particles were covered with polymeric material (starch), which significantly reduced the solubility of filter cake in organic acids. Therefore, there was a need to remove Mn3O4-based filter cake in two-stage treatment. Enzyme-A (10-wt%) and Precursor of lactic acid (12.5-wt%) dissolved 84 wt% of the filter cake. An innovative approach led to complete solubility of Mn3O4 particles when low and safe concentration of HCl (1-wt%) combined with 4-wt% lactic acid at 190°F. HCl (1-wt%) combined with lactic acid (4-wt%), dissolved 85 wt% of the Mn3O4-based filter cake after 18-22 hours soaking time at 250°F in one stage treatment.

Al Mojil, Abdullah Mohammed A.

2010-08-01T23:59:59.000Z

282

Experimental Study on the Separation of CO2 from Flue Gas Using Hollow Fiber Membrane Contactors with Aqueous Solution of Potassium Glycinate  

Science Conference Proceedings (OSTI)

Experimental study on CO2 removal from flue gas using polypropylene hollow fiber membrane contactors were conducted. Aqueous solutions of potassium glycinate were used as absorption solution to absorb CO2 in the experiments. Under moderate operating ... Keywords: Gas absorption, Carbon dioxide, Potassium glycinate, Hollow fiber membrane contactor, Membrane absorption

Weifeng Zhang; Qiuhua Wang; Mengxiang Fang; Zhongyang Luo; Kefa Cen

2009-10-01T23:59:59.000Z

283

Automotive storage of hydrogen using modified magnesium hydrides. Final report, March 1976-March 1978  

DOE Green Energy (OSTI)

Metal hydrides can store more hydrogen per unit volume than normal high pressure or cryogenic techniques. Little energy is required to store the hydrogen in the hydride, and high stability at room temperature ensures low losses over long storage periods. Safety features of metal hydride storage are favorable. Because of its low weight and high hydrogen storage densities, modified magnesium hydride offers the greatest potential for automotive storage of hydrogen. Experimental and analytical work in this program has been directed toward the optimization of this storage system. Due to the relative stability of MgH/sub 2/, modifications of the MgMH/sub x/ (M = metal ion) have been made to decrease the dissociation temperature while retaining high hydrogen capacity. This parameter is crucial since vehicle exhaust will supply the thermal energy to dissociate the hydride in an automobile. System studies indicate that hydride dissociation temperature (T/sub D/) should be 200/sup 0/C to ensure uninterrupted fuel flow at all driving and idle conditions. From experimental data developed in this four task study, we conclude that alloys comprised of Mg, Cu and Ni have come closest to meeting the dissociation temperature goal. Small additions of rare-earth elements to the basic alloy also contribute to a reduction of T/sub D/. The best alloy developed in this program exhibits a T/sub D/ = 223/sup 0/C and a hydrogen capacity near four weight percent compared to a theoretical 7.65 percent for MgH/sub 2/. That alloy has been characterized for dissociation temperature, hydrogen capacity, kinetics, and P-C-T relationships. Dissociation temperature, hydrogen capacity and material cost are reported for each alloy tested in this program.

Rohy, D. A.; Nachman, J. F.; Hammer, A. N.; Duffy, T. E.

1979-01-01T23:59:59.000Z

284

Growth of purified calcium fluoride and magnesium fluoride and degradation of optical properties by defects  

SciTech Connect

This report describes the purification and crystal growth portion of the research undertaken in this program. Several new devices for conducting chemical operations in isolated environments were perfected. The precipitator/decanter system was the most important of these. Without it the very large number of precipitate washing cycles required would have been prohibitive due to the time required using the older design. The purification process improved the purity of both fluorides. Precipitation of the alkaline earth carbonates from an alkaline solution was extremely effective in removing alkali ions. The second stage of the process used ion-exchange to remove transition metal ions and to reduce the concentration of other alkaline earths. The third stage of the process was the precipitation and washing of the product fluoride which proved to be difficult because these fluorides form gels or sols when pure. At an ammonium fluoride concentration near 8M a satisfactory precipitate was obtained. Only after a long resting period could the precipitate be washed without converting to a gel or sol. Magnesium fluoride had a much greater tendency to form gels than the calcium salt. Crystal growth was attempted by a Stockbarger method using HF as the reactive gas. The remainder of this report describes the research on the effect of defects on the optical properties of optical materials. The Landau-Placzek ratio and the method for calculating its theoretical value is described. This establishes a comparison standard for studies of doped crystals discussed in the remaining chapters of this report. As part of the preparation of the crystals for optical studies the distribution coefficients for cadmium, calcium and lead were measured and are reported. 121 refs., 30 figs., 22 tabs.

Fredericks, W.J.; Collins, P.R.

1983-01-01T23:59:59.000Z

285

Microstructure-strength relationships of heavily deformed magnesium-lithium composites containing steel fibers  

SciTech Connect

The successful development of deformation-processed metal-metal composites (DMMC) offers the potential for ductile, high-strength structural materials with high-temperature stability. An infiltration casting process was used to permeate steel wool preforms with molten magnesium-lithium (Mg-Li) alloys. The selected matrix alloys were hexagonal close packed (HCP) Mg-4wt%Li or body centered cubic (BCC) Mg-12wt%Li; the low carbon steel wool fibers were predominantly BCC ferrite. These cast HCP/BCC and BCC/BCC composites were deformed by rolling or by extrusion and swaging. Mechanical properties, microstructure, and texture development of the composites were characterized at various levels of deformation. The HCP/BCC composites had limited formability at temperatures up to 400 C while the BCC/BCC composites had excellent formability during sheet rolling at room temperature but limited formability during swaging at room temperature. The tensile strengths of these HCP/BCC and BCC/BCC composite materials increased moderately with deformation, though less than predicted from rule of mixtures (ROM) calculations. The microstructure was characterized to correlate the filament size to the deformation strain and mechanical properties of the composite material. Stereological measurements of the filament size were used to adjust ROM calculations to reflect the actual deformation strain in the fibers. However, the experimental strengths of these composite materials were still less than ROM predictions, possibly due to the presence of considerably large fibers. Of the many models used to describe the strengthening observed in DMMC materials, the Hall-Petch relationship adequately described the experimental data. Texture development was also characterized to explain the deformation characteristics of the composite materials. Chapters 2, 3 and 4 are not included here. They are being processed separately.

Jensen, J.

1997-10-08T23:59:59.000Z

286

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

E-Print Network (OSTI)

about 7%. consisted of, in tons, natural battery-grade ore, steel production by virtue of its sulfur aluminum alloys and is used in oxide form in dry cell batteries. The overall level and nature of manganese consumption in batteries was denoted by the expansion on schedule of domestic capacity for production

Torgersen, Christian

287

EPNews2009Winter  

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

are arsenic, iron, magnesium, chromium, zinc, boron, barium, selenium, and manganese. Oil shale produced waters are typically derived from retorting, mine drainage, and leachate...

288

Performance Analysis of Potassium Heat Pipes Radiator for HP-STMCs Space Reactor Power System  

SciTech Connect

A detailed design and performance results of C-C finned, and armored potassium heat pipes radiator for a 110 kWe Heat Pipes-Segmented Thermoelectric Module Converters (HP-STMCs) Space Reactor Power system (SRPS) are presented. The radiator consists of two sections; each serves an equal number of STMCs and has 162 longitudinal potassium heat pipes with 0.508 mm thick C-C fins. The width of the C-C fins at the minor diameter of the radiator is almost zero, but increases with distance along the radiator to reach 3.7 cm at the radiator's major diameter. The radiator's heat pipes (OD = 2.42 cm in front and 3.03 cm in rear) have thin titanium (0.0762 mm thick) liners and wicks (0.20 mm thick with an effective pore radius of 12-16 {mu}m) and a 1.016 mm thick C-C wall. The wick is separated from the titanium liner by a 0.4 mm annulus filled with liquid potassium to increase the capillary limit. The outer surfaces of the heat pipes in the front and rear sections of the radiator are protected with a C-C armor that is 2.17 mm and 1.70 mm thick, respectively. The inside surface of the heat pipes in the front radiator is thermally insulated while the C-C finned condensers of the rear heat pipes are exposed, radiating into space through the rear opening of the radiator cavity. The heat pipes in both the front and the rear radiators have a 1.5 m long evaporator section and each dissipates 4.47 kW while operating at 43.6% of the prevailing sonic limit. The front and rear radiator sections are 5.29 m and 2.61 m long with outer surface area and mass of 47.1 m2 and 314.3 kg, and 39.9 m2 and 243.2 kg, respectively. The total radiator is 7.63 m long and has minor and major diameters of 1.48 m and 5.57 m, respectively, and a total surface area of 87 m2; however, the effective radiator area, after accounting for heat rejection through the rear of the radiator cavity, is 98.8 m2. The radiator's total mass including the C-C armor is 557.5 kg and the specific area and specific mass are 6.41 kg/m2 and 5.07 kg/kWe, respectively.

El-Genk, Mohamed S.; Tournier, Jean-Michel [Institute for Space and Nuclear Power Studies, University of New Mexico, Albuquerque, NM, 87131 (United States); Chemical and Nuclear Engineering Dept., University of New Mexico, Albuquerque, NM, 87131 (United States)

2004-02-04T23:59:59.000Z

289

Kinetics of Potassium Desorption in Soil using Miscible Displacement1 D. L. SPARKS, L. W. ZELAZNY, AND D. C. MARTENSZ  

E-Print Network (OSTI)

Kinetics of Potassium Desorption in Soil using Miscible Displacement1 D. L. SPARKS, L. W. ZELAZNY, and B22t horizons of two Dothan (Plinthic Pa- leudults) soils. Aluminum- and calcium- saturated samples was subsequently de- sorbed suggesting K adsorption-desorption in the Dothan soils was reversible. A linear

Sparks, Donald L.

290

Detection of frozen salt in pipes using gamma-ray spectrometry of potassium self-activity  

SciTech Connect

Solar plants that use molten salts as heat transfer fluid need careful control to avoid the freezing of the salt in the pipes; if such a problem occurs, a diagnostic instrument to localize where is the frozen salt plug and to determine its length is useful. If the salt contains potassium (as is the case of the most common mixture used in solar plants, NaNO{sub 3}/KNO{sub 3} 60/40% by weight), the gamma decay of the natural unstable isotope {sup 40}K can be exploited to detect the frozen salt in a non-invasive way. Simulations and experimental results regarding the detectability of such plugs with different masses/lengths are presented. (author)

Grena, Roberto; Scafe, Raffaele; Pisacane, Fabrizio; Pilato, Renzo; Crescenzi, Tommaso; Mazzei, Domenico [ENEA, Casaccia Research Centre, via Anguillarese 301, 00123 S. Maria di Galeria, Rome (Italy)

2010-01-15T23:59:59.000Z

291

Atomistic modeling of nanowires, small-scale fatigue damage in cast magnesium, and materials for MEMS.  

Science Conference Proceedings (OSTI)

Lightweight and miniaturized weapon systems are driving the use of new materials in design such as microscale materials and ultra low-density metallic materials. Reliable design of future weapon components and systems demands a thorough understanding of the deformation modes in these materials that comprise the components and a robust methodology to predict their performance during service or storage. Traditional continuum models of material deformation and failure are not easily extended to these new materials unless microstructural characteristics are included in the formulation. For example, in LIGA Ni and Al-Si thin films, the physical size is on the order of microns, a scale approaching key microstructural features. For a new potential structural material, cast Mg offers a high stiffness-to-weight ratio, but the microstructural heterogeneity at various scales requires a structure-property continuum model. Processes occurring at the nanoscale and microscale develop certain structures that drive material behavior. The objective of the work presented in this report was to understand material characteristics in relation to mechanical properties at the nanoscale and microscale in these promising new material systems. Research was conducted primarily at the University of Colorado at Boulder to employ tightly coupled experimentation and simulation to study damage at various material size scales under monotonic and cyclic loading conditions. Experimental characterization of nano/micro damage will be accomplished by novel techniques such as in-situ environmental scanning electron microscopy (ESEM), 1 MeV transmission electron microscopy (TEM), and atomic force microscopy (AFM). New simulations to support experimental efforts will include modified embedded atom method (MEAM) atomistic simulations at the nanoscale and single crystal micromechanical finite element simulations. This report summarizes the major research and development accomplishments for the LDRD project titled 'Atomistic Modeling of Nanowires, Small-scale Fatigue Damage in Cast Magnesium, and Materials for MEMS'. This project supported a strategic partnership between Sandia National Laboratories and the University of Colorado at Boulder by providing funding for the lead author, Ken Gall, and his students, while he was a member of the University of Colorado faculty.

Dunn, Martin L. (University of Colorado, Boulder, CO); Talmage, Mellisa J. (University of Colorado, Boulder, CO); McDowell, David L., 1956- (,-Georgia Institute of Technology, Atlanta, GA); West, Neil (University of Colorado, Boulder, CO); Gullett, Philip Michael (Mississippi State University , MS); Miller, David C. (University of Colorado, Boulder, CO); Spark, Kevin (University of Colorado, Boulder, CO); Diao, Jiankuai (University of Colorado, Boulder, CO); Horstemeyer, Mark F. (Mississippi State University , MS); Zimmerman, Jonathan A.; Gall, K (Georgia Institute of Technology, Atlanta, GA)

2006-10-01T23:59:59.000Z

292

The influence of zeta potential and yield stress on the filtration characteristics of a magnesium hydroxide simulant  

Science Conference Proceedings (OSTI)

In the UK, irradiated fuels from Magnox reactors are often stored in water-filled ponds under alkaline conditions, so as to minimise corrosion of fuel cladding. This is important to prevent or reduce leakage of soluble fission products and actinides to the pond water. A variety of intermediate level wastes derived from Magnox materials are stored at power stations. Under these alkaline conditions, various species of magnesium are formed, of which magnesium hydroxide is the dominant material. The particle-fluid interactions are significant for the design and operation of facilities for hydraulic retrieval, filtration, dewatering and ion exchange treatment of fuel storage pond water and stored wet Magnox wastes. Here we describe a study of particulate properties and filtration characteristics of oxide particle simulants under laboratory conditions. Cake and medium resistance data were correlated across a range of pH conditions with electro-acoustic zeta potential and shear yield stress measurements, as a function of particle volume fractions. The influence of zeta potential on filtration properties arises directly from the interaction of particles within the sediment cake. (authors)

Biggs, Simon; Nabi, Rafiq; Poole, Colin [Leeds University/Nexia Solutions URA in Particle Science and Technology, Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, The University of Leeds, Leeds LS2 9JT (United Kingdom); Patel, Ashok [British Nuclear Group, Reactor Sites, Berkeley Centre, Berkeley, Gloucestershire, GL13 9PB (United Kingdom)

2007-07-01T23:59:59.000Z

293

Long-range southeastward transport of Asian biosmoke pollution: Signature detected by aerosol potassium in Northern Taiwan - article no. D14301  

SciTech Connect

Total potassium was determined in aerosol particles between 2002 and early 2007 in northern Taiwan (25{sup o} 02'N, 121{sup o} 31'E). Biosmoke potassium (non-sea-salt/noncrustal) was assessed and used as a tracer of biosmoke pollution, which essentially represents the combination of coal and biofuel combustion and biomass burning. PM10-associated potassium displays a typical seasonality, peaking during the winter and waning during the summer. The size distribution showed a bimodal pattern, peaking at a supermicron size (2.5-5.{mu}m) and at around 1 {mu}m, demonstrating multiple sources. Size distribution patterns revealed an evident seasonality, indicative of the different domination of natural and biosmoke sources in the two main periods of the northeasterly and summer monsoons, respectively. The relative contributions of biosmoke and natural sources to the total potassium were estimated to be 50-75% and 25-50%, respectively; the seasonality of biosmoke potassium is similar to that of total potassium. Substantial correlations existed between biosmoke potassium and selected trace metals (As, Se, Pb, and Mn), suggesting that the latter are essentially associated with biosmoke pollution. Another significant finding is that the seasonal mean concentrations of aerosol potassium between 2002 and early 2007 tend to increase. This could primarily be attributed to the increased consumption of coal in China, posing an urgent issue relevant to pollution mitigation in China. The southward inflow flux of biosmoke potassium to the south of 25{sup o} N during the northeasterly monsoon months has been estimated to be 56-79 mg m{sup -2} d{sup -1}, which could be applied to the assessment of other biosmoke-related species.

Hsu, S.C.; Liu, S.C.; Huang, Y.T.; Chou, C.C.K.; Lung, S.C.C.; Liu, T.H.; Tu, J.Y.; Tsai, F.J. [Academia Sinica, Taipei (Taiwan). Research Center for Environmental Changes

2009-07-16T23:59:59.000Z

294

Exxon catalytic coal gasification process: predevelopment program. Quarterly technical progress report, October--December 31, 1976. [Potassium and other carbonates as catalysts; incentives for secondary gasification  

SciTech Connect

The pilot plant fluidized bed gasifier was recommissioned, tested and then repaired and finally checked out with respect to instrument and data acquisition system operation and baseline performance. Bench scale fixed-bed experiments were made with potassium carbonate and potassium-sodium carbonate mixtures as catalysts: The more expensive potassium carbonate performed appreciably better. Catalyst recovery studies were begun. An engineering study with respect to the need for a secondary gasification unit (after the primary one) was inconclusive: The small predicted gains (of the order of 3 percent) in gas cost savings led to the conclusion that this alternative should be held in reserve until more definitive data is obtained. (LTN)

Kalina, T.

1977-02-01T23:59:59.000Z

295

Evaluating the improvement of corrosion residual strength by adding 1.0 wt.% yttrium into an AZ91D magnesium alloy  

SciTech Connect

The influence of yttrium on the corrosion residual strength of an AZ91D magnesium alloy was investigated detailedly. Scanning electron microscope was employed to analyze the microstructure and the fractography of the studied alloys. The microstructure of AZ91D magnesium alloy is remarkably refined due to the addition of yttrium. The electrochemical potentiodynamic polarization curve of the studied alloy was performed with a CHI 660b electrochemical station in the three-electrode system. The result reveals that yttrium significantly promotes the overall corrosion resistance of AZ91D magnesium alloy by suppressing the cathodic reaction in corrosion process. However, the nucleation and propagation of corrosion pits on the surface of the 1.0 wt.% Y modified AZ91D magnesium alloy indicate that pitting corrosion still emerges after the addition of yttrium. Furthermore, stress concentration caused by corrosion pits should be responsible for the drop of corrosion residual strength although the addition of yttrium remarkably weakens the effect of stress concentration at the tip of corrosion pits in loading process.

Wang Qiang [Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun, 130025 (China); Liu Yaohui, E-mail: liuyaohui2005@yahoo.com [Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun, 130025 (China); Fang Shijie [Department of Mechanical and Electrical Engineering, Luoyang Institute of Science and Technology, Luoyang 471023 (China); Song Yulai; Zhang Dawei; Zhang Lina; Li Chunfang [Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun, 130025 (China)

2010-06-15T23:59:59.000Z

296

Persistent infrared spectral hole burning of NO; ions in potassium halide crystals. I. Priric9ple and satellite.holle generation  

E-Print Network (OSTI)

Persistent infrared spectral hole burning of NO; ions in potassium halide crystals. I. Priric9ple spectroscopyand persistentinfrared spectralhole (PIRSH) burning separatelyand together. With interferometry cm --'and, with PIRSH burning, it has beendemijnstratedthat the narrowestlinesare

Sethna, James P.

297

Roderick MacKinnon and Ion Channels - Potassium Channels and Sodium  

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

Roderick MacKinnon and Ion Channels Roderick MacKinnon and Ion Channels Resources with Additional Information · Patents Roderick MacKinnon Courtesy of The Rockefeller University Roderick MacKinnon, M.D., a visiting researcher at the U.S. Department of Energy's Brookhaven National Laboratory, is a recipient of the 2003 Nobel Prize in Chemistry 'for structural and mechanistic studies of ion channels.' His research explains "how a class of proteins helps to generate nerve impulses - the electrical activity that underlies all movement, sensation, and perhaps even thought. The work leading to the prize was done primarily at the Cornell High Energy Synchrotron Source [CHESS] and the National Synchrotron Light Source [NSLS] at Brookhaven. The proteins, called ion channels, are tiny pores that stud the surface of all of our cells. These channels allow the passage of potassium, calcium, sodium, and chloride molecules called ions. Rapid-fire opening and closing of these channels releases ions, moving electrical impulses from the brain in a wave to their destination in the body."1

298

Thin film growth and characterization of Potassium-Tantalate-Niobate room temperature ferroelectric  

E-Print Network (OSTI)

The primary objective in fabricating ferroelectric thin films is to duplicate the polar properties and characteristics of the corresponding bulk material. Potassium Tantalate-Niobate (KTN), KTa(,-,)Nb,03-, is a continuous solid solution between the perovskite compounds KNbO3 and KTaO3. The Curie temperature of KTN can be varied by a4justing x i.e.., the composition of niobium. In the vicinity of the ferroto-paraelectric phase transition, high dielectric permittivities, large pyroelectric as well as electro-optical and nonlinear optical coefficients can be observed. Bulk KTN single crystals synthesized from high temperature melts have limited device utility due to the occurence of lamellar growth, twins, etc. For these reasons thin films of KTN find enormous applications in spatial light modulators., pyroelectric devices, holographic storage., parametric oscillators and variable delay lines. The research undertaken involved the growth of KTN thin films on lattice matched substrates. The preferential groath directions, optimum growth conditions, ideal charge composition, and ideal regime in phase diagram were established. Liquidphase epitaxy (LPE) was the technique employed for the growth of thin films. The as grown films were optically and electrically characterized.

Muntha, Nageswara Rao Venkat

1995-01-01T23:59:59.000Z

299

Start Up of a Nb-1%Zr Potassium Heat Pipe From the Frozen State  

E-Print Network (OSTI)

The start up of a liquid-metal heat pipe from the frozen state was evaluated experimentally with a Nb-1%Zr heat pipe with potassium as the working fluid. The heat pipe was fabricated and tested at Los Alamos National Laboratory. RF induction heating was used to heat 13 cm of the 1-m-long heat pipe. The heat pipe and test conditions are well characterized so that the test data may be used for comparison with numerical analyses. An attempt was made during steady state tests to calibrate the heat input so that the heat input would be known during the transient cases. The heat pipe was heated to 675C with a throughput of 600 W and an input heat flux of 6 W/cm 2 . Steady state tests, start up from the frozen state, and transient variations from steady state were conducted. Nomenclature English L length m . mass flow rate PS power setting r radius q heat flux q" heat flux per unit area T temperature v voltage V volume x axial location on heat pipe Greek e porosity r resist...

Since Its Founding; David E. Glass; Michael A. Merrigan; J. Tom Sena

1998-01-01T23:59:59.000Z

300

Flow-Assisted Alkaline Battery: Low-Cost Grid-Scale Electrical Storage using a Flow-Assisted Rechargeable Zinc-Manganese Dioxide Battery  

SciTech Connect

GRIDS Project: Traditional consumer-grade disposable batteries are made of Zinc and Manganese, 2 inexpensive, abundant, and non-toxic metals. But these disposable batteries can only be used once. If they are recharged, the Zinc in the battery develops filaments called dendrites that grow haphazardly and disrupt battery performance, while the Manganese quickly loses its ability to store energy. CUNY Energy Institute is working to tame dendrite formation and to enhance the lifetime of Manganese in order to create a long-lasting, fully rechargeable battery for grid-scale energy storage. CUNY Energy Institute is also working to reduce dendrite formation by pumping fluid through the battery, enabling researchers to fix the dendrites as they’re forming. The team has already tested its Zinc battery through 3,000 recharge cycles (and counting). CUNY Energy Institute aims to demonstrate a better cycle life than lithium-ion batteries, which can be up to 20 times more expensive than Zinc-based batteries.

2010-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "magnesium manganese potassium" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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301

X-ray absorption spectroscopy on the calcium cofactor to the manganese cluster in photosynthetic oxygen evolution  

Science Conference Proceedings (OSTI)

Along with Mn, calcium and chloride ions are necessary cofactors for oxygen evolution in Photosystem II (PS II). To further test and verify whether Ca is close to the Mn cluster, the authors substituted strontium for Ca and probed from the Sr point of view for any nearby Mn. The extended X-ray absorption fine structure (EXAFS) of Sr-reactivated PS II indicates major differences between the intact and NH{sub 2}OH-treated samples. In intact samples, the Fourier transform of the Sr EXAFS shows a Fourier peak that is missing in inactive samples. This peak II is best simulated by two Mn neighbors at a distance of 3.5 Angstrom, confirming the proximity of Ca (Sr) cofactor to the Mn cluster. In addition, polarized Sr EXAFS on oriented Sr-reactivated samples shows this peak II is dichroic: large magnitude at 10 degrees (angle between the PS II membrane normal and the x-ray electric field vector) and small at 80 degrees. Analysis of the dichroism yields the relative angle between the Sr-Mn vector and membrane normal (23 degrees {+-} 4 degrees), and the isotropic coordination number for these layered samples. X-ray absorption spectroscopy has also been employed to assess the degree of similarity between the manganese cluster in PS II and a family of synthetic manganese complexes containing the distorted cubane [Mn{sub 4}O{sub 3}X] core (X = benzoate, acetate, methoxide, hydroxide, azide, fluoride, chloride or bromide). In addition, Mn{sub 4}O{sub 3}Cl complexes containing three or six terminal Cl ligands at three of the Mn were included in this study. The EXAFS method detects the small changes in the core structures as X is varied in this series, and serves to exclude these distorted cubanes of C3v symmetry as a topological model for the Mn catalytic cluster. The sulfur K-edge x-ray absorption near-edge structure (XANES) spectra for the amino acids cysteine, methionine, their corresponding oxidized forms cystine and methionine sulfoxide, and glutathione show distinct differences between the thiol and disulfide forms. Sulfur XANES is also used to detect changes (within 5%) of the thiol-to-disulfide ratio in whole human blood, plasma, and erythrocytes.

Cinco, Roehl M.

1999-12-16T23:59:59.000Z

302

Bench-scale screening tests for a boiling sodium-potassium alloy solar receiver  

DOE Green Energy (OSTI)

Bench-scale tests were carried out in support of the design of a second-generation 75-kW{sub t} reflux pool-boiler solar receiver. The receiver will be made from Haynes Alloy 230 and will contain the sodium-potassium alloy NaK-78. The bench-scale tests used quartz-lamp-heated boilers to screen candidate boiling-stabilization materials and methods at temperatures up to 750{degree}C. Candidates that provided stable boiling were tested for hot-restart behavior. Poor stability was obtained with single 1/4-inch diameter patches of powdered metal hot-press-sintered onto the wetted side of the heat-input area. Laser-drilled and electric-discharge-machined cavities in the heated surface also performed poorly. Small additions of xenon, and heated-surface tilt out of the vertical dramatically improved poor boiling stability; additions of helium or oxygen did not. The most stable boiling was obtained when the entire heat-input area was covered by a powdered-metal coating. The effect of heated-area size was assessed for one coating: at low incident fluxes, when even this coating performed poorly, increasing the heated-area size markedly improved boiling stability. Good hot-restart behavior was not observed with any candidate, although results were significantly better with added xenon in a boiler shortened from 3 to 2 feet. In addition to the screening tests, flash-radiography imaging of metal-vapor bubbles during boiling was attempted. Contrary to the Cole-Rohsenow correlation, these bubble-size estimates did not vary with pressure; instead they were constant, consistent with the only other alkali metal measurements, but about 1/2 their size.

Moreno, J.B.; Moss, T.A.

1993-06-01T23:59:59.000Z

303

Electrochemical and structural characterization of titanium-substituted manganese oxides based on Na0.44MnO2  

DOE Green Energy (OSTI)

A series of titanium-substituted manganese oxides, Li{sub x}Ti{sub y}Mn{sub 1-y}O{sub 2} (y = 0.11, 0.22, 0.33, 0.44, and 0.55) with the Na{sub 0.44}MnO{sub 2} structure were prepared from Na{sub x}Ti{sub y}Mn{sub 1-y}O{sub 2} (x {approx} 0.44) precursors. The electrochemical characteristics of these compounds, which retain the unique double-tunnel structure during ion exchange, were examined in lithium/polymer electrolyte cells operating at 85 C. All of the substituted cathode materials intercalated lithium reversibly, with Li{sub x}Ti{sub 0.22}Mn{sub 0.78}O{sub 2} exhibiting the highest capacity in polymer cells, about 10-20% greater than that of unsubstituted Li{sub x}MnO{sub 2} made from Na{sub 0.44}MnO{sub 2}. In common with Li{sub x}MnO{sub 2}, the Ti-substituted materials exhibited good capacity retention over one hundred or more cycles, with some compositions exhibiting a fade rate of less than 0.03% per cycle.

Doeff, Marca M.; Richardson, Thomas J.; Hwang, Kwang-Taek

2004-03-01T23:59:59.000Z

304

PRODUCTION OF ACTINIDE METAL  

DOE Patents (OSTI)

A process of reducing actinide oxide to the metal with magnesium-zinc alloy in a flux of 5 mole% of magnesium fluoride and 95 mole% of magnesium chloride plus lithium, sodium, potassium, calcium, strontium, or barium chloride is presented. The flux contains at least 14 mole% of magnesium cation at 600-- 900 deg C in air. The formed magnesium-zinc-actinide alloy is separated from the magnesium-oxide-containing flux. (AEC)

Knighton, J.B.

1963-11-01T23:59:59.000Z

305

THE MAGNESIUM ISOTOPOLOGUES OF MgH IN THE A {sup 2}{Pi}-X {sup 2}{Sigma}{sup +} SYSTEM  

Science Conference Proceedings (OSTI)

Using laboratory hollow cathode spectra we have identified lines of the less common magnesium isotopologues of MgH, {sup 25}MgH and {sup 26}MgH, in the A {sup 2}{Pi}-X {sup 2}{Sigma}{sup +} system. Based on the previous analysis of {sup 24}MgH, molecular lines have been measured and molecular constants derived for {sup 25}MgH and {sup 26}MgH. Term values and linelists, in both wavenumber and wavelength units, are presented. The A {sup 2}{Pi}-X {sup 2}{Sigma}{sup +} system of MgH is important for measuring the magnesium isotope ratios in stars. Examples of analysis using the new linelists to derive the Mg isotope ratio in a metal poor dwarf and giant are shown.

Hinkle, Kenneth H.; Wallace, Lloyd [National Optical Astronomy Observatories, P.O. Box 26732, Tucson, AZ 85726 (United States); Ram, Ram S.; Bernath, Peter F. [Department of Chemistry, University of York, Heslington, York YO10 5DD (United Kingdom); Sneden, Christopher [Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States); Lucatello, Sara, E-mail: hinkle@noao.edu, E-mail: wallace@noao.edu, E-mail: rr662@york.ac.uk, E-mail: pbernath@odu.edu, E-mail: chris@verdi.as.utexas.edu, E-mail: sara.lucatello@oapd.inaf.it [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova (Italy)

2013-08-15T23:59:59.000Z

306

DISSOLUTION OF PLUTONIUM METAL USING NITRIC ACID SOLUTIONS CONTAINING POTASSIUM FLUORIDE  

Science Conference Proceedings (OSTI)

The deinventory and deactivation of the Savannah River Site's (SRS's) FB-Line facility required the disposition of approximately 2000 items from the facility's vaults. Plutonium (Pu) scraps and residues which do not meet criteria for conversion to a mixed oxide fuel will be dissolved and the solution stored for subsequent disposition. Some of the items scheduled for dissolution are composite materials containing Pu and tantalum (Ta) metals. The preferred approach for handling this material is to dissolve the Pu metal, rinse the Ta metal with water to remove residual acid, and burn the Ta metal. The use of a 4 M nitric acid (HNO{sub 3}) solution containing 0.2 M potassium fluoride (KF) was initially recommended for the dissolution of approximately 500 g of Pu metal. However, prior to the use of the flowsheet in the SRS facility, a new processing plan was proposed in which the feed to the dissolver could contain up to 1250 g of Pu metal. To evaluate the use of a larger batch size and subsequent issues associated with the precipitation of plutonium-containing solids from the dissolving solution, scaled experiments were performed using Pu metal and samples of the composite material. In the initial experiment, incomplete dissolution of a Pu metal sample demonstrated that a 1250 g batch size was not feasible in the HB-Line dissolver. Approximately 45% of the Pu was solubilized in 4 h. The remaining Pu metal was converted to plutonium oxide (PuO{sub 2}). Based on this work, the dissolution of 500 g of Pu metal using a 4-6 h cycle time was recommended for the HB-Line facility. Three dissolution experiments were subsequently performed using samples of the Pu/Ta composite material to demonstrate conditions which reduced the risk of precipitating a double fluoride salt containing Pu and K from the dissolving solution. In these experiments, the KF concentration was reduced from 0.2 M to either 0.15 or 0.175 M. With the use of 4 M HNO{sub 3} and a reduction in the KF concentration to 0.175 M, the dissolution of 300 g of Pu metal is expected to be essentially complete in 6 h. The dissolution of larger batch sizes would result in the formation of PuO{sub 2} solids. Incomplete dissolution of the PuO{sub 2} formed from the metal is not a solubility limitation, but can be attributed to a combination of reduced acidity and complexation of fluoride which slows the dissolution kinetics and effectively limits the mass of Pu dissolved.

Rudisill, T.; Crowder, M.; Bronikowski, M.

2007-10-15T23:59:59.000Z

307

X-ray and vibrational spectroscopy of manganese complexes relevant to the oxygen-evolving complex of photosynthesis  

SciTech Connect

Manganese model complexes, relevant to the oxygen-evolving complex (OEC) in photosynthesis, were studied with Mn K-edge X-ray absorption near-edge spectroscopy (XANES), Mn Kb X-ray emission spectroscopy (XES), and vibrational spectroscopy. A more detailed understanding was obtained of the influence of nuclearity, overall structure, oxidation state, and ligand environment of the Mn atoms on the spectra from these methods. This refined understanding is necessary for improving the interpretation of spectra of the OEC. Mn XANES and Kb XES were used to study a di-(mu)-oxo and a mono-(mu)-oxo di-nuclear Mn compound in the (III,III), (III,IV), and (IV,IV) oxidation states. XANES spectra show energy shifts of 0.8 - 2.2 eV for 1-electron oxidation-state changes and 0.4 - 1.8 eV for ligand-environment changes. The shifts observed for Mn XES spectra were approximately 0.21 eV for oxidation state-changes and only approximately 0.04 eV for ligand-environment changes. This indicates that Mn Kb XES i s more sensitive to the oxidation state and less sensitive to the ligand environment of the Mn atoms than XANES. These complimentary methods provide information about the oxidation state and the ligand environment of Mn atoms in model compounds and biological systems. A versatile spectroelectrochemical apparatus was designed to aid the interpretation of IR spectra of Mn compounds in different oxidation states. The design, based on an attenuated total reflection device, permits the study of a wide spectral range: 16,700 (600 nm) - 225

Visser, Hendrik

2001-05-16T23:59:59.000Z

308

Characterization of High Strain Rate Mechanical behavior of AZ31 magnesium alloy using 3D Digital Image Correlation  

Science Conference Proceedings (OSTI)

Characterization of the material mechanical behavior at sub-Hopkinson regime (0.1 to 1000 s{sup -1}) is very challenging due to instrumentation limitations and the complexity of data analysis involved in dynamic loading. In this study, AZ31 magnesium alloy sheet specimens are tested using a custom designed servo-hydraulic machine in tension at nominal strain rates up to 1000 s{sup -1}. In order to resolve strain measurement artifacts, the specimen displacement is measured using 3D Digital Image correlation instead from actuator motion. The total strain is measured up to {approx} 30%, which is far beyond the measurable range of electric resistance strain gages. Stresses are calculated based on the elastic strains in the tab of a standard dog-bone shaped specimen. Using this technique, the stresses measured for strain rates of 100 s{sup -1} and lower show little or no noise comparing to load cell signals. When the strain rates are higher than 250 s{sup -1}, the noises and oscillations in the stress measurements are significantly decreased from {approx} 250 to 50 MPa. Overall, it is found that there are no significant differences in the elongation, although the material exhibits slight work hardening when the strain rate is increased from 1 to 100 s{sup -1}.

Wang, Yanli [ORNL; Xu, Hanbing [ORNL; ERDMAN III, DONALD L [ORNL; Starbuck, J Michael [ORNL; Simunovic, Srdjan [ORNL

2011-01-01T23:59:59.000Z

309

Thermodynamics of the conversion of calcium and magnesium fluorides to the parent metal oxides and hydrogen fluoride  

Science Conference Proceedings (OSTI)

The authors have used thermodynamic modeling to examine the reaction of calcium fluoride (CaF{sub 2}) and magnesium fluoride (MgF{sub 2}) with water (H{sub 2}O) at elevated temperatures. The calculated, equilibrium composition corresponds to the global free-energy minimum for the system. Optimum, predicted reaction temperatures and reactant mole ratios are reported for the recovery of hydrogen fluoride (HF), a valuable industrial feedstock. Complete conversion of MgF{sub 2} is found at 1,000 C and a ratio of 40 moles of H{sub 2}O per 1 mole of MgF{sub 2}. For CaF{sub 2}, temperatures as high as 1,400 C are required for complete conversion at a corresponding mole ratio of 40 moles of H{sub 2}O per 1 mole of CaF{sub 2}. The authors discuss the presence of minor chemical constituents as well as the stability of various potential container materials for the pyrohydrolysis reactions at elevated temperatures. CaF{sub 2} and MgF{sub 2} slags are available as wastes at former uranium production facilities within the Department of Energy Complex and other facilities regulated by the Nuclear Regulatory Commission. Recovery of HF from these wastes is an example of environmental remediation at such facilities.

West, M.H.; Axler, K.M.

1997-02-01T23:59:59.000Z

310

Magnesium: Digital Resource Center - BOOK: Magnesium ...  

Science Conference Proceedings (OSTI)

Feb 9, 2007 ... Presents papers related to primary production and market; recycling and environmental issues; alloy development; phase transformations; ...

311

Long-Term Reduction in 137Cs Concentration in Food Crops on Coral Atolls Resulting from Potassium Treatment  

SciTech Connect

Bikini Island was contaminated March 1, 1954 by the Bravo detonation (U.S nuclear test series, Castle) at Bikini Atoll. About 90% of the estimated dose from nuclear fallout to potential island residents is from cesium-137 ({sup 137}Cs) transferred from soil to plants that are consumed by residents. Thus, radioecology research efforts have been focused on removing {sup 137}Cs from soil and/or reducing its uptake into vegetation. Most effective was addition of potassium (K) to soil that reduces {sup 137}Cs concentration in fruits to 3-5% of pretreatment concentrations. Initial observations indicated this low concentration continued for some time after K was last applied. Long-term studies were designed to evaluate this persistence in more detail because it is very important to provide assurance to returning populations that {sup 137}Cs concentrations in food (and, therefore, radiation dose) will remain low for extended periods, even if K is not applied annually or biennially. Potassium applied at 300, 660, 1260, and 1970 kg ha{sup -1} lead to a {sup 137}Cs concentration in drinking coconut meat that is 34, 22, 10, and about 4 % of original concentration, respectively. Concentration of {sup 137}Cs remains low 8 to 10 y after K is last applied. An explanation for this unexpected result is discussed.

Robison, W; Stone, E; Hamilton, T; Conrado, C

2005-04-08T23:59:59.000Z

312

Manganese and Ceria Sorbents for High Temperature Sulfur Removal from Biomass-Derived Syngas -- The Impact of Steam on Capacity and Sorption Mode  

Science Conference Proceedings (OSTI)

Syngas derived from biomass and coal gasification for fuel synthesis or electricity generation contains sulfur species that are detrimental to downstream catalysts or turbine operation. Sulfur removal in high temperature, high steam conditions has been known to be challenging, but experimental reports on methods to tackle the problem are not often reported. We have developed sorbents that can remove hydrogen sulfide from syngas at high temperature (700 C), both in dry and high steam conditions. The syngas composition chosen for our experiments is derived from statistical analysis of the gasification products of wood under a large variety of conditions. The two sorbents, Cu-ceria and manganese-based, were tested in a variety of conditions. In syngas containing steam, the capacity of the sorbents is much lower, and the impact of the sorbent in lowering H{sub 2}S levels is only evident in low space velocities. Spectroscopic characterization and thermodynamic consideration of the experimental results suggest that in syngas containing 45% steam, the removal of H{sub 2}S is primarily via surface chemisorptions. For the Cu-ceria sorbent, analysis of the amount of H{sub 2}S retained by the sorbent in dry syngas suggests both copper and ceria play a role in H{sub 2}S removal. For the manganese-based sorbent, in dry conditions, there is a solid state transformation of the sorbent, primarily into the sulfide form.

Cheah, S.; Parent, Y. O.; Jablonski, W. S.; Vinzant, T.; Olstad, J. L.

2012-07-01T23:59:59.000Z

313

Cell Fundamentals, Phenomena and Alternatives II  

Science Conference Proceedings (OSTI)

Mar 14, 2012 ... Cryoscopic Data for Hall-Héroult Bath Containing Magnesium Fluoride, Calcium Fluoride, Potassium Cryolite, and Sodium Chloride: Asbjorn ...

314

Reflectance-based assessment of spider mite "bio-response" to maize leaves and plant potassium content in different irrigation regimes  

Science Conference Proceedings (OSTI)

It is widely accepted that pest infestations elicit a change in plant physiology, which cause detectable changes in crop leaf reflectance. In this study, we test the hypothesis that crop leaf reflectance may also be used to forecast the risk of pest ... Keywords: Crop attractiveness, Hyperspectral imaging, Integrated pest management, Leaf potassium content, Remote sensing, Tetranychidae

C. Nansen, A. J. Sidumo, X. Martini, K. Stefanova, J.Dale Roberts

2013-09-01T23:59:59.000Z

315

New Precision Mass Measurements of Neutron-Rich Calcium and Potassium Isotopes and Three-Nucleon Forces  

Science Conference Proceedings (OSTI)

We present precision Penning trap mass measurements of neutron-rich calcium and potassium isotopes in the vicinity of neutron number N=32. Using the TITAN system, the mass of 51K was measured for the first time, and the precision of the 51,52Ca mass values were improved significantly. The new mass values show a dramatic increase of the binding energy compared to those reported in the atomic mass evaluation. In particular, 52Ca is more bound by 1.74 MeV, and the behavior with neutron number deviates substantially from the tabulated values. An increased binding was predicted recently based on calculations that include three-nucleon (3N) forces. We present a comparison to improved calculations, which agree remarkably with the evolution of masses with neutron number, making neutron-rich calcium isotopes an exciting region to probe 3N forces.

Gallant, A. T. [TRIUMF, University of British Columbia; Bale, J. C. [TRIUMF, University of British Columbia/Simon Fraser University-Canada; Brunner, T. [TRIUMF, University of British Columbia; Chowdhury, U. [TRIUMF, University of British Columbia/ University of Manitoba-Canada; Ettenauer, S. [TRIUMF, University of British Columbia; Lennarz, A. [TRIUMF, University of British Columbia/Westfälische Wilhelms-Universität-Germany; Robertson, D. [TRIUMF, University of British Columbia; Simon, V. V. [TRIUMF-Canada/Ruprecht-Karls-Universität Heidelberg/Max-Planck-Inst.-Heidelberg, Germany; Chaudhuri, A. [TRIUMF, University of British Columbia; Holt, J. D. [UTK/ORNL; Kwiatkowski, A. A. [TRIUMF, University of British Columbia; Mané, E. [TRIUMF, University of British Columbia; Menéndez, J. [Inst. für Kernphysik, Tech. Univ. Darmstadt-Germany/ExtreMe Matter Inst., GSI-Darmstadt; Schultz, B. E. [TRIUMF, University of British Columbia; Simon, M. C. [TRIUMF, University of British Columbia; Andreoiu, C. [Simon Fraser University, Canada; Delheij, P. [TRIUMF, University of British Columbia; Pearson, M. [TRIUMF, University of British Columbia; Savajols, H. [GANIL, Caen cedex, France; Schwenk, A. [Inst. für Kernphysik, Tech. Univ. Darmstadt-Germany/ExtreMe Matter Inst., GSI-Darmstadt; Dilling, J. [TRIUMF, University of British Columbia

2012-01-01T23:59:59.000Z

316

Block of voltage-gated potassium channels by Pacific ciguatoxin-1 contributes to increased neuronal excitability in rat sensory neurons  

SciTech Connect

The present study investigated the actions of the polyether marine toxin Pacific ciguatoxin-1 (P-CTX-1) on neuronal excitability in rat dorsal root ganglion (DRG) neurons using patch-clamp recording techniques. Under current-clamp conditions, bath application of 2-20 nM P-CTX-1 caused a rapid, concentration-dependent depolarization of the resting membrane potential in neurons expressing tetrodotoxin (TTX)-sensitive voltage-gated sodium (Na{sub v}) channels. This action was completely suppressed by the addition of 200 nM TTX to the external solution, indicating that this effect was mediated through TTX-sensitive Na{sub v} channels. In addition, P-CTX-1 also prolonged action potential and afterhyperpolarization (AHP) duration. In a subpopulation of neurons, P-CTX-1 also produced tonic action potential firing, an effect that was not accompanied by significant oscillation of the resting membrane potential. Conversely, in neurons expressing TTX-resistant Na{sub v} currents, P-CTX-1 failed to alter any parameter of neuronal excitability examined in this study. Under voltage-clamp conditions in rat DRG neurons, P-CTX-1 inhibited both delayed-rectifier and 'A-type' potassium currents in a dose-dependent manner, actions that occurred in the absence of alterations to the voltage dependence of activation. These actions appear to underlie the prolongation of the action potential and AHP, and contribute to repetitive firing. These data indicate that a block of potassium channels contributes to the increase in neuronal excitability, associated with a modulation of Na{sub v} channel gating, observed clinically in response to ciguatera poisoning.

Birinyi-Strachan, Liesl C. [Neurotoxin Research Group, Department of Health Sciences, University of Technology, Sydney, Broadway NSW (Australia); Gunning, Simon J. [Neurotoxin Research Group, Department of Health Sciences, University of Technology, Sydney, Broadway NSW (Australia); Lewis, Richard J. [Institute for Molecular Bioscience, University of Queensland, Brisbane QLD (Australia); Nicholson, Graham M. [Neurotoxin Research Group, Department of Health Sciences, University of Technology, Sydney, Broadway NSW (Australia)]. E-mail: Graham.Nicholson@uts.edu.au

2005-04-15T23:59:59.000Z

317

NIDC: Online Catalog of Isotope Products | Product Search  

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

Product Search Product Search Step 1 - Enter your search criteria below. Element Name Actinium Aluminum Americium Antimony Argon Arsenic Astatine Barium Berkelium Beryllium Bismuth Bohrium Boron Bromine Cadmium Caesium Calcium Californium Carbon Cerium Chlorine Chromium Cobalt Copernicium Copper Curium Darmstadtium Dubnium Dysprosium Einsteinium Erbium Europium Fermium Fluorine Francium Gadolinium Gallium Germanium Gold Hafnium Hassium Helium Holmium Hydrogen Indium Iodine Iridium Iron Krypton Lanthanum Lawrencium Lead Lithium Lutetium Magnesium Manganese Meitnerium Mendelevium Mercury Molybdenum Neodymium Neon Neptunium Nickel Niobium Nitrogen Nobelium Osmium Oxygen Palladium Phosphorus Platinum Plutonium Polonium Potassium Praseodymium Promethium Protactinium Radium Radon Rhenium Rhodium Roentgenium Rubidium Ruthenium Rutherfordium Samarium Scandium Seaborgium Selenium Silicon Silver Sodium Strontium Sulfur Tantalum Technetium Tellurium Terbium Thallium Thorium Thulium Tin Titanium Tungsten Ununhexium Ununoctium Ununpentium Ununquadium Ununseptium Ununtrium Uranium Vanadium Xenon Ytterbium Yttrium Zinc Zirconium

318

NIDC: Online Catalog of Isotope Products | Request a New Product  

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

Request a New Product Request a New Product Step 1 - Enter the new product's criteria below. Element Name Actinium Aluminum Americium Antimony Argon Arsenic Astatine Barium Berkelium Beryllium Bismuth Bohrium Boron Bromine Cadmium Caesium Calcium Californium Carbon Cerium Chlorine Chromium Cobalt Copernicium Copper Curium Darmstadtium Dubnium Dysprosium Einsteinium Erbium Europium Fermium Fluorine Francium Gadolinium Gallium Germanium Gold Hafnium Hassium Helium Holmium Hydrogen Indium Iodine Iridium Iron Krypton Lanthanum Lawrencium Lead Lithium Lutetium Magnesium Manganese Meitnerium Mendelevium Mercury Molybdenum Neodymium Neon Neptunium Nickel Niobium Nitrogen Nobelium Osmium Oxygen Palladium Phosphorus Platinum Plutonium Polonium Potassium Praseodymium Promethium Protactinium Radium Radon Rhenium Rhodium Roentgenium Rubidium Ruthenium Rutherfordium Samarium Scandium Seaborgium Selenium Silicon Silver Sodium Strontium Sulfur Tantalum Technetium Tellurium Terbium Thallium Thorium Thulium Tin Titanium Tungsten Ununhexium Ununoctium Ununpentium Ununquadium Ununseptium Ununtrium Uranium Vanadium Xenon Ytterbium Yttrium Zinc Zirconium

319

Advanced Recombinant Manganese Peroxidase for Biosynthesis of Lignin Bioproducts, Phase I Final Report, STTR Grant #: DE-SC0007503.  

Science Conference Proceedings (OSTI)

The core purpose of this Phase I STTR was to evaluate the feasibility of a new method of producing a recombinant version of manganese peroxidase (MnP) enzyme. MnP is a potentially valuable enzyme for producing high value lignin products and also for industrial de-coloring operations such as biobleaching of pulp and color removal from textile dye effluents. This lignin-modifying enzyme is produced in small amounts by the native host, a white rot fungus. Previous work by Oregon State University developed a secreted recombinant version of the enzyme in the yeast Pichia pastoris. Unfortunately, the expression is barely moderate and the enzyme is heavily glycosylated, which inhibits purification. In this work, the gene for the enzyme is given a tag which targets production of the enzyme to the peroxisome. This is a promising approach since this location is also where heme and hydrogen peroxide are sequestered, which are both necessary cofactors for MnP. More than ten recombinant strains were constructed, verified, and expressed in the Pichia system. Constitutive (GAP) and methanol-induced promoters (AOX) were tried for peroxisomal targeted, cytosolic, and secreted versions of MnP. Only the secreted strains showed activity. The amount of expression was not significantly changed. The degree of glycosylation was lessened using the AOX (methanol) promotoer, but the resulting enzyme was still not able to be purified using immobilized metal affinity chromatography. Additional work beyond the scope of the defined Phase I project was undertaken to construct, verify, and express Pichia strains that mutated the MnP glycosylation sites to inhibit this process. These strains did not show significant activity. The cause is not known, but it is possible that these sites are important to the structure of the enzyme. Also beyond the scope proposed for our Phase I STTR, the team collaborated with AbSci, a startup with a new E. coli based expression system focused on the production of antibodies and enzymes containing disulfide bonds and requiring folding/post-translational modification. With only limited time remaining in the Phase I schedule, a single construct was made to produce MnP with this system. The enzyme was produced in the soluble fraction of the cell lysate, but no activity was measured. MnP from the existing recombinant source was used to act on lignin. The lignin was from a Kraft process and had a molecular weight of about 10,000 Da. Using 1000 Da dialysis membranes and UV-visible spectroscopy, no modification of either lignin was evident in the dialysate or the retentate. Assays using 2,6 dimethoxy phenol (DMP) as a substrate showed consistent activity throughout the project. In summary, these results fell far short of our expectations. A Phase II proposal was not submitted. Possible reasons for the failure of peroxisomal targeting include destruction by native hydrogen peroxide, native proteases, or unforeseen causes. The AbSci system was only lighted tested and further work may yield a strain with active enzyme. The lack of evidence for lignin modification may be due to the techniques employed. NMR or GC-MS studies may reveal evidence of modification.

Beatty, Christopher; Kitner, Joshua; Lajoie, Curtis; McClain, Sean; Potochnik, Steve

2012-12-13T23:59:59.000Z

320

Magnesium Technology 2012  

Science Conference Proceedings (OSTI)

Jul 31, 2011 ... K-27: Measuring Heat Transfer during Twin Roll Casting of Metals ... of Mg-Ni Alloy by Consumable Cathode Molten Salt Electrolysis.

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

Magnesium Technology 2000  

Science Conference Proceedings (OSTI)

M.D. Nave, A.K. Ddllt., arid D.H. St]oh?l ... M.D. Ni~ilc, A.K. Dnlzle, nlld D.H. S t ] o h ~ ... 253. B. Broilfiiz, M . Kntsir, nird E. Agllio?~. L)~~\\.clopment of High ...

322

WEB RESOURCES: Magnesium Production  

Science Conference Proceedings (OSTI)

Feb 12, 2007 ... Mg Production(Australia).pdf 49.21 KB MgProduction_Australia.mht 81.47 KB Mg Production(Brazil Israel Congo Malaysia).pdf 50.48 KB

323

BOOK: Magnesium Technology 2002  

Science Conference Proceedings (OSTI)

May 3, 2007 ... These proceedings include papers on all aspects of extraction and processing, physical and mechanical properties, alloy development, and ...

324

Magnesium Workshop Madrid 2013  

Science Conference Proceedings (OSTI)

Nov 15, 2012 ... First-Principles Investigation of Mg-Rare Earth Precipitates and LPSO ... and Tube Warm Forming: from Incremental to Electromagnetic Forming.

325

Microstructures of Magnesium Alloys  

Science Conference Proceedings (OSTI)

Aug 5, 2010 ... It is shown that whilst the mechanical action of FSP always leads to microstructural refinement by fracturing coarse particles, dissolution and ...

326

Recycling - Magnesium - TMS  

Science Conference Proceedings (OSTI)

... Analysis, Green House Gases, and Climate Change, Educational Resources. Spacer ... This presentation examines scenarios of emergent vehicle technology  ...

327

BOOK: Magnesium Technology 2004  

Science Conference Proceedings (OSTI)

May 3, 2007 ... Includes papers on primary production and market; recycling and environmental issues; alloy development; phase transformations; ...

328

Technology Development Program for an Advanced Potassium Rankine Power Conversion System Compatible with Several Space Reactor Designs  

SciTech Connect

This report documents the work performed during the first phase of the National Aeronautics and Space Administration (NASA), National Research Announcement (NRA) Technology Development Program for an Advanced Potassium Rankine Power Conversion System Compatible with Several Space Reactor Designs. The document includes an optimization of both 100-kW{sub e} and 250-kW{sub e} (at the propulsion unit) Rankine cycle power conversion systems. In order to perform the mass optimization of these systems, several parametric evaluations of different design options were investigated. These options included feed and reheat, vapor superheat levels entering the turbine, three different material types, and multiple heat rejection system designs. The overall masses of these Nb-1%Zr systems are approximately 3100 kg and 6300 kg for the 100- kW{sub e} and 250-kW{sub e} systems, respectively, each with two totally redundant power conversion units, including the mass of the single reactor and shield. Initial conceptual designs for each of the components were developed in order to estimate component masses. In addition, an overall system concept was presented that was designed to fit within the launch envelope of a heavy lift vehicle. A technology development plan is presented in the report that describes the major efforts that are required to reach a technology readiness level of 6. A 10-year development plan was proposed.

Yoder, G.L.

2005-10-03T23:59:59.000Z

329

Impact #309 Potassium-Argon and Argon-Argon Dating of Crustal Rocks and the Problem of Excess Argon  

E-Print Network (OSTI)

According to the assumptions foundational to potassium-argon (K-Ar) and argon-argon (Ar-Ar) dating of rocks, there should not be any daughter radiogenic argon ( 40 Ar * ) in rocks when they form. When measured, all 40 Ar * in a rock is assumed to have been produced by in situ radioactive decay of 40 K within the rock since it formed. However, it is well established that volcanic rocks (e.g. basalt) contain excess 40 Ar * , that is, 40 Ar which cannot be attributed to either atmospheric contamination or in situ radioactive decay of 40 K. 1 This excess 40 Ar * represents primordial Ar carried from source areas in the earth’s mantle by the parent magmas, is inherited by the resultant volcanic rocks, and thus has no age significance. However, are all other rocks in the earth’s crust also susceptible to “contamination” by excess 40 Ar * emanating from the mantle? If so, then the K-Ar and Ar-Ar “dating ” of crustal rocks would be similarly questionable. When muscovite (a common mineral in crustal rocks) is heated to 740°– 860°C under high Ar pressures for periods of 3 to 10.5 hours it absorbs significant quantities of Ar, producing K-Ar “ages ” of up to 5 billion years, and the absorbed Ar is indistinguishable from radiogenic argon ( 40 Ar *). 2 In other experiments muscovite was synthesized from a colloidal gel under similar temperatures and Ar pressures, the resultant muscovite retaining up to 0.5 wt % Ar at 640°C and a vapor pressure of 4,000 atmospheres. 3 This is approximately 2,500 times as much Ar as is found in natural muscovite. Thus under certain conditions Ar can be incorporated into minerals which are supposed to exclude Ar when they crystallize. Patterson et al. envisage noble gases from the mantle (and the atmosphere) migrating and circulating through the crust, so there should be evidence of excess

Andrew A. Snelling T

1999-01-01T23:59:59.000Z

330

Stability and Rate Capability of Al Substituted Lithium-Rich High-Manganese Content Oxide Materials for Li-Ion Batteries  

SciTech Connect

The structures, electrochemical properties and thermal stability of Al-substituted lithium-excess oxides, Li{sub 1.2}Ni{sub 0.16} Mn{sub 0.56}Co{sub 0.08-y}Al{sub y}O{sub 2} (y = 0, 0.024, 0.048, 0.08), are reported, and compared to the stoichiometric compounds, LiNi{sub z}Mn{sub z}Co{sub 1-2z}O{sub 2}. A solid solution was found up to at least y = 0.06. Aluminum substitution improves the poor thermal stability while preserving the high energy density of lithium-excess oxides. However, these high manganese compositions are inferior to the lithium stoichiometric materials, LiNi{sub z}Mn{sub z}Co{sub 1-2z}O{sub 2} (z = 0.333, 0.4), in terms of both power and thermal stability.

Li, Zheng; Chernova, Natasha A.; Feng, Jijun; Upreti, Shailesh; Omenya, Fredrick; Whittingham, M. Stanley (SUNY-Binghamton)

2012-03-15T23:59:59.000Z

331

Automated on-line determination of PPB levels of sodium and potassium in low-Btu coal gas and fluidized bed combustor exhaust by atomic emission spectrometry  

SciTech Connect

The Morgantown Energy Technology Center (METC), US Department of Energy, is involved in the development of processes and equipment for production of low-Btu gas from coal and for fluidized bed combustion of coal. The ultimate objective is large scale production of electricity using high temperature gas turbines. Such turbines, however, are susceptible to accelerated corrosion and self-destruction when relatively low concentrations of sodium and potassium are present in the driving gas streams. Knowledge and control of the concentrations of those elements, at part per billion levels, are critical to the success of both the gas cleanup procedures that are being investigated and the overall energy conversion processes. This presentation describes instrumentation and procedures developed at the Ames Laboratory for application to the problems outlined above and results that have been obtained so far at METC. The first Ames instruments, which feature an automated, dual channel flame atomic emission spectrometer, perform the sodium and potassium determinations simultaneously, repetitively, and automatically every two to three minutes by atomizing and exciting a fraction of the subject gas sample stream in either an oxyhydrogen flame or a nitrous oxide-acetylene flame. The analytical results are printed and can be transmitted simultaneously to a process control center.

Haas, W.J. Jr.; Eckels, D.E.; Kniseley, R.N.; Fassel, V.A.

1981-01-01T23:59:59.000Z

332

Catalytic conversion of canola oil over potassium-impregnated HZSM-5 catalysts: C{sub 2}-C{sub 4} olefin production and model reaction studies  

Science Conference Proceedings (OSTI)

The influence of catalyst acidity, reaction temperature, and canola oil space velocity on the conversion of canola oil was evaluated using a fixed-bed microreactor at atmospheric pressure at reaction temperatures and space velocities (WHSV) in the ranges 400--500 C and 1.8--3.6 h{sup {minus}1}, respectively, over potassium-impregnated HZSMs-5 catalysts. These catalysts were thoroughly characterized using XRD, N{sub 2} adsorption measurements, {sup 1}H NMR, TPD of NH{sub 3}, FT-IR, C{sub 2}-C{sub 4} olefins from canola oil were determined. The incorporation of potassium into HZSM-5 catalyst resulted in both the dilution and poisoning of Bronsted and total acid sites. These acidity changes only severely affected the acid catalyzed reactions, such as oligomerization and aromatization, and resulted in drastic modifications in product distribution. The maximum C{sub 2}C{sub 4} olefin yield of 25.8 wt % was obtained at 500 C and 1.8 h{sup {minus}1} space velocity with catalyst K1 of relatively low Bronsted and total acidity.

Katikaneni, S.P.R.; Adjaye, J.D.; Idem, R.O.; Bakhshi, N.N. [Univ. of Saskatchewan, Saskatoon (Canada). Catalysis and Chemical Reaction Engineering Lab.] [Univ. of Saskatchewan, Saskatoon (Canada). Catalysis and Chemical Reaction Engineering Lab.

1996-10-01T23:59:59.000Z

333

Effects of calcium magnesium acetate on the combustion of coal-water slurries. Final project report, 1 September 1989--28 February 1993  

Science Conference Proceedings (OSTI)

To conduct studies on the combustion of coal water fuels (CWFs) an appropriate facility was designed and constructed. The main components were (1) a high-temperature isothermal laminar flow furnace that facilitates observation of combustion events in its interior. The design of this system and its characterization are described in Chapter 1. (2) Apparatus for slurry droplet/agglomerate particle generation and introduction in the furnace. These devices are described in Chapters 1 and 3 and other attached publications. (3) An electronic optical pyrometer whose design, construction theory of operation, calibration and performance are presented in Chapter 2. (4) A multitude of other accessories, such as particle fluidization devices, a suction thermometer, a velocimeter, high speed photographic equipment, calibration devices for the pyrometer, etc., are described throughout this report. Results on the combustion of CWF droplets and CWF agglomerates made from micronized coal are described in Chapter 3. In the same chapter the combustion of CWF containing dissolved calcium magnesium acetate (CMA) axe described. The combustion behavior of pre-dried CWF agglomerates of pulverized grain coal is contrasted to that of agglomerates of micronized coal in Chapter 4. In the same chapter the combustion of agglomerates of carbon black and diesel soot is discussed as well. The effect of CMA on the combustion of the above materials is also discussed. Finally, the sulfur capture capability of CMA impregnated micronized and pulverized bituminous coals is examined in Chapter 5.

Levendis, Y.A.; Wise, D.; Metghalchi, H.; Cumper, J.; Atal, A.; Estrada, K.R.; Murphy, B.; Steciak, J.; Hottel, H.C.; Simons, G.

1993-07-01T23:59:59.000Z

334

The Uncertainties in the 22Ne + alpha-capture Reaction Rates and the Production of the Heavy Magnesium Isotopes in Asymptotic Giant Branch Stars of Intermediate Mass  

E-Print Network (OSTI)

We present new rates for the 22Ne(alpha, n)25Mg and 22Ne(alpha,gamma)26Mg reactions, with uncertainties that have been considerably reduced compared to previous estimates, and we study how these new rates affect the production of the heavy magnesium isotopes in models of intermediate mass Asymptotic Giant Branch (AGB) stars of different initial compositions. All the models have deep third dredge-up, hot bottom burning and mass loss. Calculations have been performed using the two most commonly used estimates of the 22Ne + alpha rates as well as the new recommended rates, and with combinations of their upper and lower limits. The main result of the present study is that with the new rates, uncertainties on the production of isotopes from Mg to P coming from the 22Ne + alpha-capture rates have been considerably reduced. We have therefore removed one of the important sources of uncertainty to effect models of AGB stars. We have studied the effects of varying the mass-loss rate on nucleosynthesis and discuss other uncertainties related to the physics employed in the computation of stellar structure, such as the modeling of convection, the inclusion of a partial mixing zone and the definition of convective borders. These uncertainties are found to be much larger than those coming from 22Ne + alpha-capture rates, when using our new estimates. Much effort is needed to improve the situation for AGB models.

A. Karakas; M. Lugaro; M. Wiescher; J. Goerres; C. Ugalde

2006-01-27T23:59:59.000Z

335

A High Temperature (400 to 650oC) Secondary Storage Battery Based on Liquid Sodium and Potassium Anodes  

DOE Green Energy (OSTI)

This STTR Phase I research program was on the development of high temperature (400 to 650 C), secondary batteries with roundtrip efficiency > 90% for integration with a 3 to 10 kW solid oxide fuel cell (SOFC) system. In fulfillment of this objective, advanced planar high temperature rechargeable batteries, comprised of an alkali metal ion conducting, highly refractory, beta'' alumina solid electrolyte (BASE) sandwiched between liquid sodium (or potassium) anode and liquid metal salt cathode, were developed at MSRI. The batteries have been successfully demonstrated at a working temperature as high as 600 C. To our knowledge, so far no work has been reported in the literature on planar rechargeable batteries based on BASE, and results obtained in Phase I for the very first time demonstrated the viability of planar batteries, though relatively low temperature tubular-based sodium-sulfur batteries and ZEBRA batteries have been actively developed by very limited non U.S. companies. The results of this Phase I work have fulfilled all the goals and stated objectives, and the achievements showed much promise for further, substantial improvements in battery design and performance. The important results of Phase I are briefly described in what follows: (1) Both Na-BASE and K-BASE discs and tubes have been successfully fabricated using MSRI's patented vapor phase process. Ionic conductivity measurements showed that Na-BASE had higher ionic conductivity than K-BASE, consistence with the literature. At 500 C, Na-BASE conductivity is 0.36 S/cm, which is more than 20 times higher than 8YSZ electrolyte used for SOFC at 800 C. The activation energy is 22.58 kJ/mol. (2) CuCl{sub 2}, FeCl{sub 2}, ZnCl{sub 2}, and AgCl were identified as suitable salts for Na/metal salt or K/metal salt electrochemical couples based on thermochemical data. Further open circuit voltage measurements matched those deduced from the thermochemical data. (3) Tubular cells with CuCl{sub 2} as the cathode and Na as the anode were constructed. However, it was discovered that CuCl{sub 2} was somewhat corrosive and dissolved iron, an element of the cathode compartment. Since protective coating technology was beyond this Phase I work scope, no further work on the CuCl{sub 2} cathode was pursued in Phase I. Notwithstanding, due to its very high OCV and high specific energy, CuCl{sub 2} cathode is a very attractive possibility for a battery capable of delivering higher specific energy with higher voltage. Further investigation of the Na-CuCl{sub 2} battery can be done by using suitable metal coating technologies developed at MSRI for high temperature applications. (4) In Phase I, FeCl{sub 2} and ZnCl{sub 2} were finalized as the potential cathodes for Na-metal salt batteries for delivering high specific energies. Planar Na-FeCl{sub 2} and Na-ZnCl{sub 2} cells were designed, constructed, and tested between 350 and 600 C. Investigation of charge/discharge characteristics showed they were the most promising batteries. Charge/discharge cycles were performed as many as 27 times, and charge/discharge current was as high as 500 mA. No failure was detected after 50 hours testing. (5) Three-cell planar stacks were designed, constructed, and evaluated. Preliminary tests showed further investigation was needed for optimization. (6) Freeze-thaw survival was remarkably good for planar BASE discs fabricated by MSRI's patented vapor phase process.

Tao, Greg; Weber, Neill

2007-06-08T23:59:59.000Z

336

Methods for collection and analysis of geopressured geothermal and oil field waters  

DOE Green Energy (OSTI)

Present methods are described for the collection, preservation, and chemical analysis of waters produced from geopressured geothermal and petroleum wells. Detailed procedures for collection include precautions and equipment necessary to ensure that the sample is representative of the water produced. Procedures for sample preservation include filtration, acidification, dilution for silica, methyl isobutyl ketone (MIBK) extraction of aluminum, addition of potassium permanganate to preserve mercury, and precipitation of carbonate species as strontium carbonate for stable carbon isotopes and total dissolved carbonate analysis. Characteristics determined at the well site are sulfide, pH, ammonia, and conductivity. Laboratory procedures are given for the analysis of lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium, barium, iron, manganese, zinc, lead, aluminum, and mercury by atomic absorption and flame emission spectroscopy. Chloride is determined by silver nitrate titration and fluoride by ion-specific electrode. Bromide and iodide concentrations are determined by the hypochlorite oxidation method. Sulfate is analyzed by titration using barium chloride with thorin indicator after pretreatment with alumina. Boron and silica are determined colorimetrically by the carmine and molybdate-blue methods, respectively. Aliphatic acid anions (C/sub 2/ through C/sub 5/) are determined by gas chromatography after separation and concentration in a chloroform-butanol mixture.

Lico, M.S.; Kharaka, Y.K.; Carothers, W.W.; Wright, V.A.

1982-01-01T23:59:59.000Z

337

Effect of co-doped SnO{sub 2} nanoparticles on photoluminescence of cu-doped potassium lithium borate glass  

Science Conference Proceedings (OSTI)

The SnO{sub 2} co-doped lithium potassium borate glasses doped with 0.05, 0.10, 0.25 and 0.50 mol% of Cu were synthesized by the melt quenching technique. The SnO{sub 2} co-dope was added to the compounds in the amounts of 0.05, 0.10, and 0.20 mol%. The photoluminescent spectrum for different concentrations of copper was studied. It was observed that the intensity of blue emission (450, 490 nm) varies with concentration mol%. In addition, with different concentration of SnO{sub 2} to 0.10 mol% Cu, the influence of the luminescence has been observed to enhance intensity and shifted to blue and red (490, 535 nm) emissions.

Namma, Haydar Aboud; Wagiran, H.; Hussin, R.; Ariwahjoedi, B. [Department of Physics, Universiti Teknologi Malaysia, Skudai 81310, Malaysia and Baghdad College of Economic Sciences University (Iraq); Fundamental and Applied Sciences Department, Universiti Teknologi PETRONAS, 31750 Tronoh (Malaysia)

2012-09-26T23:59:59.000Z

338

Advances in Synthesis of Co- and Ter- Polycarbonates and Polyesters from Non-Petroleum Feedstocks and Kinetic Studies of Ligand Substitution from Manganese Half-Sandwich Complexes  

E-Print Network (OSTI)

This dissertation is written in two parts. The first pertains to polycarbonate and polyester synthesis using relatively benign processes. The synthesis of polycarbonates from the coupling of CO2 and epoxides catalyzed by transition metal catalysts has long been studied in the DJD group. The benefits of this process are that it utilizes comparatively benign reagents, can be performed using no extraneous solvent, and is 100% atom efficient. A method potentially useful for achieving more desirable polycarbonate properties is to produce an epoxide A/epoxide B/CO2 terpolymer, thus allowing more fine "tuning" of properties to what one may desire while simultaneously influencing relative epoxide reactivity to potentially increase catalytic turnovers. Specifically, the coupling of propylene oxide and cyclohexene oxide with CO2 to yield a random copolymer with tunable properties has been studied via a Fineman-Ross analysis. Propylene oxide was found to be incorporated into the resultant polymer chain with anywhere from 4-10 times the preference of cylcohexene oxide. Although it has been reported as early as 1969, the copolymerization of epoxides and cyclic anhydrides catalyzed by transition metal complexes to yield polyesters via a chain-growth mechanism has recently gained much attention. This robust method of polyester synthesis can utilize rather inexpensive reagents to synthesize an array of polyester products which have a wide range of Tg values (-30 degrees C ? 90 degreesC), achievable through simple monomer selection. The second part of this dissertation deals with the kinetic study of ligand substitution from manganese carbonyl metal fragments. Some time ago it was postulated that complexes of the (Cp)M(CO)2L variety undergo ligand substitution via a associative mechanism allowed by a haptotropic eta5-eta3 shift in the eta5 ligand. Through kinetic studies and theoretical modeling, an approximate activation energy barrier of ~34 kJ/mol has been calculated for the ring slip of (2,5-dimethylpyrrole)Mn to occur. Additionally, further kinetic studies were performed in which Tp, a ligand electronically similar to Cp, was compared to MnCp complexes.

Poland, Ross Rivers

2012-05-01T23:59:59.000Z

339

ASM Specialty Handbook: Magnesium and Magnesium Alloys - TMS  

Science Conference Proceedings (OSTI)

Oct 22, 2007 ... This handbook from ASM International includes chapters called "Corrosion Behavior" and "Stress-Corrosion Cracking". "Corrosion Behavior" ...

340

dynamic recrystallization in magnesium monocrystals  

Science Conference Proceedings (OSTI)

Jul 20, 2012 ... If the price of this product displays as $0.00 for your customer category, you may download it for free. You must, however, add it to your cart and ...

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they are not comprehensive nor are they the most current set.
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341

Magnesium Workshop Madrid 2013 - TMS  

Science Conference Proceedings (OSTI)

Additional tickets (____ x$20). Guided Visit to Toledo and Conference Banquet. ? Plan to attend. ? Do not plan to attend. ? Additional tickets (_____ x $85).

342

The Magnesium Problem in Superalloys  

Science Conference Proceedings (OSTI)

by lack of fundamental data. Electra Slag Remelting. Ichihashi ..... "Handbook of Binary Phase Diagrams", Genium Publ. Corp.,. 1984. 't. 17. D.L. Sponseller,.

343

Magnesium Workshop Madrid 2013: Registration  

Science Conference Proceedings (OSTI)

TMS reserves the right to any audio and video reproduction of all presentations at every TMS-sponsored meeting. Recording of sessions (audio, video, ...

344

Direct synthesis of magnesium borohydride  

DOE Patents (OSTI)

A method is disclosed for directly preparing an alkaline earth metal borohydride, i.e. Mg(BH.sub.4).sub.2, from the alkaline earth metal boride MgB.sub.2 by hydrogenating the MgB.sub.2 at an elevated temperature and pressure. The boride may also be doped with small amounts of a metal chloride catalyst such as TiCl.sub.3 and/or NiCl.sub.2. The process provides for charging MgB.sub.2 with high pressure hydrogen above at least 70 MPa while simultaneously heating the material to about 350.degree. C. to about 400.degree. C. The method is relatively simple and inexpensive and provides a reversible hydride compound having a hydrogen capacity of at least 11 wt %.

Ronnebro, Ewa Carin Ellinor (Kennewick, WA); Severa, Godwin (Honolulu, HI); Jensen, Craig M. (Kailua, HI)

2012-04-03T23:59:59.000Z

345

Dehydration of Magnesium Chloride Hexahydrate  

Science Conference Proceedings (OSTI)

Transfer and Consumption of Oxygen in Gold-bearing Sulfide Ores: Agnico-eagle Mines Trials · Tundish Process Performance Improvement: Some Indian Case ...

346

Developments in the Magnesium Industry  

Science Conference Proceedings (OSTI)

Transfer and Consumption of Oxygen in Gold-bearing Sulfide Ores: Agnico-eagle Mines Trials · Tundish Process Performance Improvement: Some Indian Case ...

347

Aluminum and Magnesium Alloys I  

Science Conference Proceedings (OSTI)

Mar 1, 2011... was related to different heating and cooling conditions during FSW. .... The fixture is used as drop tower for constant acceleration tests and ...

348

Magnesium Workshop Madrid 2013: Housing  

Science Conference Proceedings (OSTI)

VOLUNTEER TOOLS, Expand VOLUNTEER TOOLS .... The weather in May is delightful; warm and dry with average temperatures around 22ºC. Obtain a Travel  ...

349

TMS 2010: Aluminum and Magnesium  

Science Conference Proceedings (OSTI)

The Strategic Impact of Changing Energy Markets on the Aluminium Industry Presented by Adams ... Lead Organizer: Kai F. Karhausen, Hydro Aluminium

350

Ab Initio Thermodynamic Study of the CO2 Capture Properties of Potassium Carbonate Sesquihydrate, K2CO3·1.5H2O  

SciTech Connect

By combining density functional theory and lattice phonon dynamics, the thermodynamic properties of CO2 absorption/desorption reactions with dehydrated potassium carbonates through K2CO3·1.5H2O + CO2 = 2KHCO3 + 0.5H2O(g) are analyzed. The energy change and the chemical potential of this reaction have been calculated and used to evaluate its thermodynamic properties and phase transitions. The results indicate that the K2CO3·1.5H2O can only be applied for postcombustion CO2 capture technology at temperatures lower than its phase transition temperature, which depends on the CO2 pressure and the steam pressure with the best range being PH2O ? 1.0 bar. Above the phase transition temperature, the sorbent will be regenerated into anhydrous K2CO3. If the steam pressure PH2O is much greater than 1.0 bar, it is possible to use the K2CO3·1.5H2O sorbent for precombustion CO2 capture technology. Compared to anhydrous K2CO3, K2CO3·1.5H2O requires less energy for regeneration.

Duan, Yuhua; Luebkes,David R.; Pennline, Henry W; Li, Bingyun Li; Janik, Michael J.; Halley, Woods

2012-01-01T23:59:59.000Z

351

It's Elemental - The Periodic Table of Elements - Elements Listed by Atomic  

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

Atomic Number Atomic Number 1 Hydrogen H 2 Helium He 3 Lithium Li 4 Beryllium Be 5 Boron B 6 Carbon C 7 Nitrogen N 8 Oxygen O 9 Fluorine F 10 Neon Ne 11 Sodium Na 12 Magnesium Mg 13 Aluminum Al 14 Silicon Si 15 Phosphorus P 16 Sulfur S 17 Chlorine Cl 18 Argon Ar 19 Potassium K 20 Calcium Ca 21 Scandium Sc 22 Titanium Ti 23 Vanadium V 24 Chromium Cr 25 Manganese Mn 26 Iron Fe 27 Cobalt Co 28 Nickel Ni 29 Copper Cu 30 Zinc Zn 31 Gallium Ga 32 Germanium Ge 33 Arsenic As 34 Selenium Se 35 Bromine Br 36 Krypton Kr 37 Rubidium Rb 38 Strontium Sr 39 Yttrium Y 40 Zirconium Zr 41 Niobium Nb 42 Molybdenum Mo 43 Technetium Tc 44 Ruthenium Ru 45 Rhodium Rh 46 Palladium Pd 47 Silver Ag 48 Cadmium Cd 49 Indium In 50 Tin Sn 51 Antimony Sb 52 Tellurium Te 53 Iodine I 54 Xenon Xe 55 Cesium Cs 56 Barium Ba 57 Lanthanum La 58 Cerium Ce

352

Review of Wildfire Effects on Chemical Water Quality  

SciTech Connect

The Cerro Grande Fire of May 2000 burned almost 43,000 acres of forested land within the Pajarito Plateau watershed in northern New Mexico. Runoff events after the fire were monitored and sampled by Los Alamos National Laboratory. Changes in the composition of runoff water were noted when compared to runoff water composition of the previous 20 years. In order to understand the chemical water quality changes noted in runoff water after the Cerro Grande Fire, a summary of the reported effects of fire on runoff water chemistry and on soils that contribute to runoff water chemistry was compiled. The focus of this report is chemical water quality, so it does not address changes in sediment transport or water quantity associated with fires. Within the general inorganic parameters, increases of dissolved calcium, magnesium, nitrogen, phosphorus, and potassium and pH in runoff water have been observed as a result of fire. However, the dissolved sodium, carbon, and sulfate have been observed to increase and decrease as a result of fire. Metals have been much less studied, but manganese, copper, zinc, and cesium-137 have been observed to increase as a result of fire.

Kelly Bitner; Bruce Gallaher; Ken Mullen

2001-05-01T23:59:59.000Z

353

Uranium hydrogeochemical and stream sediment reconnaissance data release for the Elk City NTMS Quadrangle, Idaho/Montana, including concentrations of forty-five additional elements  

Science Conference Proceedings (OSTI)

Totals of 1580 water and 1720 sediment samples were collected from 1754 locations in the quadrangle. Elemental concentration, field measurement, weather, geologic, and geographic data for each sample location are listed for waters in Appendix I-A and for sediments in Appendix I-B. Uranium/thorium ratios for sediment samples are also included in Appendix I-B. All elemental analyses were performed at the LASL. Water samples were initially analyzed for uranium by fluorometry. All water samples containing more than 40 parts per billion (ppB) uranium were reanalyzed by delayed-neutron counting (DNC). A supplemental report containing the multielement analyses of water samples will be open filed in the near future. Sediments were analyzed for uranium and thorium as well as aluminum, antimony, arsenic, barium, beryllium, bismuth, cadmium, calcium, cerium, cesium, chlorine, chromium, cobalt, copper, dysprosium, europium, gold, hafnium, iron, lanthanum, lead, lithium, lutetium, magnesium, manganese, nickel, niobium, potassium, rubidium, samarium, selenium, scandium, silver, sodium, strontium, tantalum, terbium, tin, titanium, tungsten, vanadium, ytterbium, zinc, and zirconium. Basic statistics for 40 of these elements are presented. All sediments were analyzed for uranium by delayed-neutron counting. Other elemental concentrations in sediments were determined by neutron-activation analysis for 30 elements, by x-ray fluorescence for 12 elements, and by arc-source emission spectrography for 2 elements. Analytical results for sediments are reported as parts per million.

Broxton, D.E.; Beyth, M.

1980-07-01T23:59:59.000Z

354

The Periodic Table of Elements C  

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

Atomic Number Chemical Symbol Atomic Weight Chemical Name = Solid at room temperature = Liquid at room temperature = Gas at room temperature = Radioactive = Artificially Made KEY METALS NON-METALS 12.011 http://education.jlab.org/ Last revised on April 3, 2013 [294] H Li Na K Be Mg Ca Sc Ti Rb Cs Fr Sr Y Ba Ra Zr Hf Rf V Nb Ta Db Cr Mo W Sg Mn Tc Re Bh Fe Ru Os Hs Co Rh Ir Mt Ni Pd Pt Ds Cu Ag Au Rg Zn Cd Hg Cn Ga In Tl Uut Ge Sn Pb Fl As Sb Bi Uup Se Te Po Lv Br I At Uus Kr Xe Rn Uuo La Ac Ce Th Pr Pa Nd U Pm Np Sm Pu Eu Am Gd Cm Tb Bk Dy Cf Ho Es Er Fm Tm Md Yb Yb No Lu Lr B Al C Si N P O S F Cl Ne He Ar HYDROGEN LITHIUM SODIUM POTASSIUM BERYLLIUM MAGNESIUM CALCIUM SCANDIUM TITANIUM RUBIDIUM CESIUM FRANCIUM STRONTIUM YTTRIUM BARIUM RADIUM ZIRCONIUM HAFNIUM RUTHERFORDIUM VANADIUM NIOBIUM TANTALUM DUBNIUM CHROMIUM MOLYBDENUM TUNGSTEN SEABORGIUM MANGANESE TECHNETIUM RHENIUM BOHRIUM IRON RUTHENIUM OSMIUM HASSIUM

355

The Periodic Table of Elements C  

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

.011 .011 Atomic Number Chemical Symbol Atomic Weight Chemical Name = Solid at room temperature = Liquid at room temperature = Gas at room temperature = Radioactive = Artificially Made KEY METALS NON-METALS http://education.jlab.org/ Last revised on April 3, 2013 [294] H Li Na K Be Mg Ca Sc Ti Rb Cs Fr Sr Y Ba Ra Zr Hf Rf V Nb Ta Db Cr Mo W Sg Mn Tc Re Bh Fe Ru Os Hs Co Rh Ir Mt Ni Pd Pt Ds Cu Ag Au Rg Zn Cd Hg Cn Ga In Tl Uut Ge Sn Pb Fl As Sb Bi Uup Se Te Po Lv Br I At Uus Kr Xe Rn Uuo La Ac Ce Th Pr Pa Nd U Pm Np Sm Pu Eu Am Gd Cm Tb Bk Dy Cf Ho Es Er Fm Tm Md Yb Yb No Lu Lr B Al C Si N P O S F Cl Ne He Ar HYDROGEN LITHIUM SODIUM POTASSIUM BERYLLIUM MAGNESIUM CALCIUM SCANDIUM TITANIUM RUBIDIUM CESIUM FRANCIUM STRONTIUM YTTRIUM BARIUM RADIUM ZIRCONIUM HAFNIUM RUTHERFORDIUM VANADIUM NIOBIUM TANTALUM DUBNIUM CHROMIUM MOLYBDENUM TUNGSTEN SEABORGIUM MANGANESE TECHNETIUM RHENIUM BOHRIUM IRON RUTHENIUM OSMIUM HASSIUM COBALT

356

Mobilization of trace elements in aquifers by biodegradation of hydrocarbon contaminants. Master Thesis  

Science Conference Proceedings (OSTI)

This study had two objectives: (1) to determine the extent of metal mobility within petroleum-contaminated aquifers, (2) to determine if biodegradation of petroleum hydrocarbons can explain metal mobility. The approach reviewed analytical results from 2305 groundwater sampling events, taken from 958 wells, located at 136 sites found at 53 Air Force installations. The study showed that high levels of metals are present at petroleum hydrocarbon sites where metals would not generally be expected. Of the metals with drinking water maximum contaminant levels (MCLs), mercury and silver were detected the least frequently. Barium and copper were detected at the sites, but fewer than 2.5 percent of the samples exceeded their MCLs. All other metals exceeded their MCLs in at least 2.5 percent of the samples, with antimony and lead exceeding their MCLs in 19 percent and 10 percent of samples, respectively. Higher concentrations of barium and manganese were most strongly correlated with petroleum hydrocarbon contamination, and relatively strong correlations also existed for aluminum, arsenic, iron, and lead. Major cations such as calcium, magnesium, sodium and potassium were least affected by petroleum hydrocarbons concentrations.

Kearney, S.L.

1997-12-01T23:59:59.000Z

357

Study of the interactions of molten sodium nitrate-potassium nitrate 50 mol % mixture with water vapor and carbon dioxide in air. Final report, June 2, 1980-June 30, 1981  

DOE Green Energy (OSTI)

The interactions of aerial components such as water, carbon dioxide, and oxygen with the binary 50 mol % mixture of sodium nitrate and potassium nitrate have been studied in the temperature range 300 to 600/sup 0/C using electrochemical methods. In addition, the behavior of nitrite ions in this melt was investigated electrochemically. By judicious choice of techniques, in situ electroanalysis was possible and the necessary relevant data to accomplish this is presented, as well as insight into the corresponding electrochemical mechanisms associated with the electroactive species. The influence of each atmospheric component was examined separately. At temperatures above 300/sup 0/C, nitrite ions are found to accumulate due to thermal decomposition of the nitrate. Water is highly soluble in the salt mixture, but no hydrolytic reactions were observed. Two methods of in situ analysis for water are described. Pure carbon dioxide is found to attack the melt at all temperatures above 250/sup 0/C producing carbonate. (LEW)

White, S.H.; Twardoch, U.M.

1981-09-01T23:59:59.000Z

358

Aluminum battery alloys  

DOE Patents (OSTI)

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

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

1984-09-28T23:59:59.000Z

359

Aluminum battery alloys  

SciTech Connect

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

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

1985-01-01T23:59:59.000Z

360

Physiological regulation of laccase and manganese ...  

Durmishidze Institute of Biochemistry and Biotechnology, 10 km Agmasheneblis kheivani, 0159 Tbilisi, Georgia article info Article history: Received 16 ...

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

High Manganese Steels - Programmaster.org  

Science Conference Proceedings (OSTI)

Oct 20, 2010 ... Mechanical Behavior and Microstructural Evolution of Fe-22Mn-C TWIP/TRIP Steels as a Function of C Content: Eileen Yang1; Hatem Zurob1; ...

362

Manganese Oxide Composite Electrodes for Lithium Batteries  

figure according to the manufacturer’s needs. ... Electric and plug-in hybrid electric vehicles, Portable electronic devices, Medical devices, and

363

Nanostructured manganese oxide clusters supported on ...  

2 evolution at nano-structured Mn oxide clusters in mesoporous silica under very mild conditions for the ?rst time. For driving the catalyst with

364

Color stable manganese-doped phosphors  

DOE Patents (OSTI)

A process for preparing color stable Mn.sup.+4 doped phosphors includes providing a phosphor of formula I; A.sub.x[MF.sub.y]:Mn.sup.+4 I and contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid; A.sub.x[MF.sub.y]; II wherein A is Li, Na, K, Rb, Cs, NR.sub.4 or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; R is H, lower alkyl, or a combination thereof; x is the absolute value of the charge of the [MF.sub.y] ion; and y is 5, 6 or 7. In particular embodiments, M is Si, Ge, Sn, Ti, Zr, or a combination thereof. A lighting apparatus capable of emitting white light includes a semiconductor light source; and a phosphor composition radiationally coupled to the light source, and which includes a color stable Mn.sup.+4 doped phosphor.

Lyons, Robert Joseph (Burnt Hills, NY); Setlur, Anant Achyut (Niskayuna, NY); Deshpande, Anirudha Rajendra (Twinsburg, OH); Grigorov, Ljudmil Slavchev (Sofia, BG)

2012-08-28T23:59:59.000Z

365

Manganese containing layer for magnetic recording media  

DOE Patents (OSTI)

The present invention provides for a magnetic recording media incorporating Mn-containing layers between a substrate and a magnetic layer to provide media having increased coercivity and lower noise. The Mn-containing layer can be incorporated in a rotating, translating or stationary recording media to operate in conjunction with magnetic transducing heads for recording and reading of magnetic data, as well as other applications. The magnetic recording medium of the invention preferably includes a Co or Co alloy film magnetic layer, and Mn-containing layer, preferably comprised of VMn, TiMn, MnZn, CrMnMo, CrMnW, CrMnV, and CrMnTi, and most preferably a CrMn alloy, disposed between the substrate and the magnetic layer to promote an epitaxial crystalline structure in the magnetic layer. The medium can further include seed layers, preferably polycrystalline MgO for longitudinal media, underlayers, and intermediate layers. Underlayers and intermediate layers are comprised of materials having either an A2 structure or a B2-ordered crystalline structure disposed between the seed layer and the magnetic layer. Materials having an A2 structure are preferably Cr or Cr alloys, such as CrV, CrMo, CrW and CrTi. Materials having a B2-ordered structure having a lattice constant that is substantially comparable to that of Cr, such as those preferably selected from the group consisting of NiAl, AILCo, FeAl, FeTi, CoFe, CoTi, CoHf, CoZr, NiTi, CuBe, CuZn, A-LMn, AlRe, AgMg, and Al.sub.2 FeMn.sub.2, and is most preferably FeAl or NiAl.

Lambeth, David N. (Pittsburgh, PA); Lee, Li-Lien (Santa Clara, CA); Laughlin, David E. (Pittsburgh, PA)

1999-01-01T23:59:59.000Z

366

Manganese oxide composite electrodes for lithium batteries  

DOE Patents (OSTI)

An activated electrode for a non-aqueous electrochemical cell is disclosed with a precursor thereof a lithium metal oxide with the formula xLi.sub.2MnO.sub.3.(1-x)LiMn.sub.2-yM.sub.yO.sub.4 for 0.5

Johnson, Christopher S. (Naperville, IL); Kang, Sun-Ho (Naperville, IL); Thackeray, Michael M. (Naperville, IL)

2009-12-22T23:59:59.000Z

367

Manganese oxide composite electrodes for lithium batteries  

DOE Patents (OSTI)

An activated electrode for a non-aqueous electrochemical cell is disclosed with a precursor of a lithium metal oxide with the formula xLi.sub.2MnO.sub.3.(1-x)LiMn.sub.2-yM.sub.yO.sub.4 for 0

Thackeray, Michael M. (Naperville, IL); Johnson, Christopher S. (Naperville, IL); Li, Naichao (Croton on Hudson, NY)

2007-12-04T23:59:59.000Z

368

Experimental Characterization of Manganese Cobalt Oxide (MCO)  

Science Conference Proceedings (OSTI)

A Novel Electrode Material for Symmetrical Solid Oxide Fuel Cells ... High Performance Oxide Protective Coatings for SOFC Components · Influence of Pore ...

369

Photoassembly of the photosystem II manganese cluster  

DOE Green Energy (OSTI)

Assembly of the photosynthetic water-oxidizing complex (WOC) is believed to involve the sequential oxidation and ligation of individual Mn atoms in a process called photoactivation. The kinetics with which photoactivation occurs has been interpreted to indicate a series mechanism, in which the product of the reaction of Mn{sup 2+} with the first PSII charge separation is unstable until processed by a second PSII charge separation. Because the decay of the unstable intermediate is accelerated in the presence of added reductants of Mn{sup 3+}, it has been hypothesized that the unstable intermediate is Mn{sup 3+} ligated with high affinity and stabilized by ligands supplied by WOC polypeptides. According to this hypothesis, photooxidation of a second Mn{sup 2+} to Mn{sup 3+}, followed by ligation of two more Mn{sup 2+} ions, results in formation of a stable Mn(II)2-Mn(III)2 complex. Several authors have reported a {le}l {mu}M K{sub m} value for a Mn{sup 2+} (or Mn{sup 3+}) binding site in PSII. In most of these determinations, H{sub 2}O{sub 2} was present. In another case, the K{sub m} was determined from the inhibition by Mn{sup 2+} of diphenylcarbazide (DPC) photooxidation. On the other hand, the K{sub m} for Mn{sup 2+} oxidation by Y{sub Z+} in the absence of any other additions, is {approximately}10 {mu}M. We have postulated that this 10 {mu}M value is the K{sub m} for Mn{sup 2+} photooxidation by Y{sub Z+} in the second photoact of the photoactivation mechanism, which occurs with low quantum efficiency. According to this view, the Mn{sup {le}}{sup 3+} ligated near Y{sub Z} with high efficiency on the first photoact is responsible for the inhibition of DPC photooxidation in the presence of Mn{sup 2+} and for the low quantum efficiency of steady-state Mn{sup 2+} photooxidation. Here, we provide evidence that this is the case.

Blubaugh, D.J. [Kentucky Univ., Lexington, KY (United States); Cheniae, G.M. [Utah State Univ., Logan, UT (United States)

1991-12-31T23:59:59.000Z

370

Magnesium Alloy Development Using Phase Equilibria Computation ...  

Science Conference Proceedings (OSTI)

The work illustrates the role of calculated phase diagrams, solidification paths ... AZ31 In-situ Analysis of the Tensile Deformation Mechanisms in Mg-1Mn-1Nd(wt. ... Electrochemical Investigation on Chlorine and Electrolyte Intercalation into ... K -38: Production of Mg-Ni Alloy by Consumable Cathode Molten Salt Electrolysis.

371

corrosion of diffusion bonded magnesium - aluminum couples  

Science Conference Proceedings (OSTI)

Jul 20, 2012 ... If the price of this product displays as $0.00 for your customer category, you may download it for free. You must, however, add it to your cart and ...

372

Magnesium Metal Matrix Nanocomposites By Electromagnetic ...  

Science Conference Proceedings (OSTI)

EMAT transforms electromagnetic energy into high intensity sonication to induce ... In the current work, the physics of acoustic production, the initial conditions of ... Department of Energy's Energy Efficiency and Renewable Energy Industrial ...

373

Magnesium Workshop Madrid 2013: Technical Program  

Science Conference Proceedings (OSTI)

The conference will be organized to include plenary sessions on the different topics of the conference. Each session will start with a keynote lecture given by an ...

374

WELDABILITY AND WELDING TECHNOLOGY OF MAGNESIUM ALLOYS  

SciTech Connect

The peculiarities of welding of Mg alloys, protection of Mg during the welding, reduction of the metal weld seam, difficulties during welding, general characteristic of the weldability of alloys of various systems (Mg-Mn, Mg-AlZn, Mg- Zn- Zr, Mn- Zr-rare earth metals), the tendency of the alloys for crack formation during welding, mechanical properties and structure of weld joints, the effect of some technological factors on the strength of the weld joint of deformable alloys, fluxes and coatings for welding, the welding technology for deformable Mg alloys, and casts in removal of defects (protective gases used and sources of current supply, preparation of the details for the welding, selection of the addition material and welding conditions, technique and technology of welding parts and casts, control, and correction of defects) are discussed. (Referativnyy zhurnal, Metallurgiya, No. 6, 1962)

Shpagin. B.V.

1961-01-01T23:59:59.000Z

375

Magnesium: Digital Resource Center Text Topic - TMS  

Science Conference Proceedings (OSTI)

Feb 12, 2007 ... Print this topic. Topic Title WEB RESOURCE: MIL-HDBK-5H: Metallic Materials and Elements for Aerospace Vehicle Structures ...

376

TABLE OF CONTENTS Magnesium Technology 2008  

Science Conference Proceedings (OSTI)

Trace Additions of Ag and Ca ............................................................................................ .....................133. Chamini Mendis, Keiichiro Oh-ishi, and Kazuhiro Hono.

377

Magnesium-based Bioceramics in Orthopedic Applications  

Science Conference Proceedings (OSTI)

Microstructural Characteristics of Nano Calcium Phosphates Doped with Fluoride and Titanium Ions · Microwave Assisted Synthesis of Nano Hydroxyapatite ...

378

ARTICLE: Corrosion Resistance of Magnesium Alloys  

Science Conference Proceedings (OSTI)

Oct 22, 2007 ... Joined: 2/5/2007. This chapter from the ASM Handbook, Volume 13A Corrosion: Fundamentals, Testing and Protection is available online.

379

Antibiofilm Activity of Nanosized Magnesium Fluoride  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, Materials Science & Technology 2010. Symposium, Surface Properties of Biomaterials. Presentation Title, From Nanotechnology to ...

380

Reduce Your Burden – Use Magnesium Alloys  

Science Conference Proceedings (OSTI)

Especially in transportation solutions have to be found to reduce the CO2 emissions drastically. This can be done when the weight of airplanes, cars and trucks ...

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

Light Metals: Aluminum, Magnesium, and Titanium  

Science Conference Proceedings (OSTI)

Cast Shop for Aluminum Production ... In this proposed, six-session symposium, papers addressing all aspects of cost reduction in titanium and its alloys will be ...

382

006 Corrosion Susceptibility of Magnesium Based Biodegradable  

Science Conference Proceedings (OSTI)

... the degradation products of some implants may initiate adverse foreign body reaction in the tissue. ..... 186 Wireline Failures in Oil & Gas Wells - Case Studies.

383

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

Office of Scientific and Technical Information (OSTI)

Resources & Links Industry Associations FederalState Programs Technical Information Plant Assessments Software Tools Energy Management Expertise...

384

Leon Prentice Leads “Supersonic” Advances in Magnesium ...  

Science Conference Proceedings (OSTI)

Nov 23, 2012... structural metals—in the transportation industry could yield significant fuel and ... methods are extremely energy-intensive and detrimental to the environment. ... At the time Prentice joined the project in 2007, the team had ...

385

Dispersion of Nanoparticles in Magnesium Using Contactless ...  

Science Conference Proceedings (OSTI)

The authors acknowledge financial support from the US National Science Foundation award number DMR-0845868, Department of Energy DOE-EERE- ITP and ...

386

Magnesium Removal from Secondary Aluminum Melts in ...  

Science Conference Proceedings (OSTI)

Recovery of Precious Metals from Chloride Media Using Microalgae Waste from Biofuel Extraction · Segregation Roasting of a Saprolitic Laterite Ore: An ...

387

Unconventional ECAE Processing of Magnesium Alloys  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2010 TMS Annual Meeting & Exhibition. Symposium , Ultrafine Grained Materials – Sixth International Symposium. Presentation ...

388

Creep Behavior of Magnesium Microalloyed Wrought Superalloys  

Science Conference Proceedings (OSTI)

Lattice constant of y 'phase and carbides were .... fore changes their Lattice constants (fig. 10). The presence of Mg in ... towers the boundary energy and the i

389

Key challenges in developing rechargeable magnesium batteries...  

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

application as post lithium-ion batteries, due to the following advantages; 1) high energy density, 2) low cost and 3) intrinsic safety. If two electron and divalent Mg ion...

390

Magnesium-Based Hydrogen Storage Nanomaterials  

Science Conference Proceedings (OSTI)

Microstructural Evolution of SnS Thin Films Grown by Electrodeposition · Morphology Engineering of 1D, 2D and 3D TiO2 Nanostructures and Their Application ...

391

Kinetics of the chlorination of magnesium oxide  

DOE Green Energy (OSTI)

The chlorination reaction of MgO (MgO + Cl/sub 2/ ..-->.. MgCl/sub 2/ + 1/2 O/sub 2/) was investigated by an apparatus designed to measure the product gas O/sub 2/ concentration. Reaction of a packed bed of 1.0-..mu..-diam particles changed from an initially reaction controlled regime to a diffusion controlled regime as the MgCl/sub 2/ product layer thickened. The ''grain model'' proposed by Szekely, Evans and Sohn approximated the data quite well, except at long reaction times, when the effects of sintering of the product layer and pore closure became pronounced. By using the ''grain model,'' an Arrhenius-type rate expression was determined for the temperature range of 510/sup 0/-643/sup 0/C: k(cm/sec) = 31.8 exp(-28.Okcal/RT). The effective diffusion coefficient for Cl/sub 2/ in the MgCl/sub 2/ product layer was also determined. The preparation method and thermal history of the MgO greatly varied both its surface area and reactivity. The MgO prepared by hydrolyzing MgCl/sub 2/ at 550/sup 0/C was 14 times more reactive and had 23 times less surface area than MgO prepared by dehydrating Mg(OH)/sub 2/ at 550/sup 0/C. Sintering the MgO before reaction reduced its reactivity, while not changing its surface area greatly; indicating that surface diffusion and recrystallization of the MgO might have occurred.

Hesson, R.N.

1979-01-01T23:59:59.000Z

392

magnesium technology 2007 table of contents  

Science Conference Proceedings (OSTI)

Wim Sillekens and D.C.W. van der Linden. The Effect of Texture on the Mechanical Properties of AZ31 Mg Alloy by Equal Channel Angular Extrusion [pp

393

Magnesium: Digital Resource Center Text Topic  

Science Conference Proceedings (OSTI)

Date Posted: 10/22/2007 12:20 PM Posted By: Lynette Karabin. This chapter from the ASM Handbook, Volume 13A Corrosion: Fundamentals, Testing and ...

394

ductility prediction for magnesium casting using microstructure ...  

Science Conference Proceedings (OSTI)

Jul 20, 2012 ... Dog-bone shaped AM50 casting samples are used in the experimental part of the work. The experimentally quantified pore characteristics are ...

395

Automotive Magnesium Applications and Life Cycle Environmental ...  

Science Conference Proceedings (OSTI)

Jan 22, 2008 ... Life cycle energies and emissions are compared for steel, aluminum and ... 3rd International Conference on SF6 and the Environment, 2004.

396

Design Methods in Magnesium Alloy Development  

Science Conference Proceedings (OSTI)

Materials Genomics Past & Future: From CALPHAD to Flight · Modelling the Properties of Multi-Component Commercial Alloys · Molecular Dynamics ...

397

Magnesium Workshop Madrid 2013: Home Page - TMS  

Science Conference Proceedings (OSTI)

IMPORTANT DATES. November 15, 2012: > Abstract deadline. December 15, 2012: > Confirmation of abstract acceptance. February 15, 2013: > Registration ...

398

Polysilazane Based Corrosion Coatings for Magnesium  

Science Conference Proceedings (OSTI)

Long-Term Surface Restoration Effect Introduced by Advanced Lubricant Additive · Nanocomposite Thermal Spray Coatings. New Hardfacing Overlay Claddings ...

399

Nano Aluminium and Magnesium Matrix Composites  

Science Conference Proceedings (OSTI)

Symposium, Metal and Polymer Matrix Composites ... Fabrication of Metal Matrix Composites via Spark Plasma Sintering for Nuclear Energy Application.

400

Solid state electrochemical current source  

DOE Patents (OSTI)

A cathode and a solid state electrochemical cell comprising said cathode, a solid anode and solid fluoride ion conducting electrolyte. The cathode comprises a metal oxide and a compound fluoride containing at least two metals with different valences. Representative compound fluorides include solid solutions of bismuth fluoride and potassium fluoride; and lead fluoride and potassium fluoride. Representative metal oxides include copper oxide, lead oxide, manganese oxide, vanadium oxide and silver oxide.

Potanin, Alexander Arkadyevich (Sarov, RU); Vedeneev, Nikolai Ivanovich (Sarov, RU)

2002-04-30T23:59:59.000Z

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

Analytical Controlled Losses of Potassium from Straw  

E-Print Network (OSTI)

high-fouling biomass fuels in combustion boilers and othercombustion processes, and knowledge of LOI is the minimum requirement for proper interpreta- tion of analyses of biomass

Thy, P.; Grundvig, S.; Jenkins, B. M.; Shiraki, R.; Lesher, C. E.

2005-01-01T23:59:59.000Z

402

Superconducting thin films on potassium tantalate substrates  

DOE Patents (OSTI)

A superconductive system for the lossless transmission of electrical current comprising a thin film of superconducting material Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x epitaxially deposited upon a KTaO.sub.3 substrate. The KTaO.sub.3 is an improved substrate over those of the prior art since the it exhibits small lattice constant mismatch and does not chemically react with the superconducting film.

Feenstra, Roeland (Oak Ridge, TN); Boatner, Lynn A. (Oak Ridge, TN)

1992-01-01T23:59:59.000Z

403

POTASSIUM CONSERVATION IN TROPICAL PRODUCTION SYSTEMS.  

E-Print Network (OSTI)

exchangeable K is very fast in sandy soils, which makes theand leaching just for the sandy soil. In this soil, initial

Rosolem, Ciro A; Garcia, Rodrigo A

2009-01-01T23:59:59.000Z

404

CATALYTIC CONVERSION OF ORGANIC COMPOUNDS USING PENETRATING RADIATION  

DOE Patents (OSTI)

A method of hydrogenating an olefinic hydrocarbon by irradiating a substrate catalyst and increasing its catalytic activity is described. Ferric oxide with about 0.005% by weight of at least one oxide of a metal selected from the group consisting of aluminum, magnesium, nickel, zirconium, and manganese incorporated therein is irradiated. Then an alkane is placed upon the surface of the catalyst and irradiated in an atmosphere of hydrogen. Any olefin produced from this radiolysis becomes hydrogenated. (AEC)

Caffrey, J.M. Jr.

1961-10-01T23:59:59.000Z

405

Mixed metal films with switchable optical properties  

DOE Green Energy (OSTI)

Thin, Pd-capped metallic films containing magnesium and first row transition metals (Mn, Fe, Co) switch reversibly from their initial reflecting state to visually transparent states when exposed to gaseous hydrogen or following cathodic polarization in an alkaline electrolyte. Reversion to the reflecting state is achieved by exposure to air or by anodic polarization. The films were prepared by co-sputtering from one magnesium target and one manganese, iron, or cobalt target. Both the dynamic optical switching range and the speed of the transition depend on the magnesium-transition metal ratio. Infrared spectra of films in the transparent, hydrided (deuterided) states support the presence of the intermetallic hydride phases Mg3MnH7, Mg2FeH6, and Mg2CoH5.

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

2001-10-16T23:59:59.000Z

406

Mercury and platinum abundances in mercury-manganese stars  

E-Print Network (OSTI)

We report new results for the elemental and isotopic abundances of the normally rare elements mercury and platinum in HgMn stars. Typical overabundances can be 4 dex or more. The isotopic patterns do not follow the fractionation model of White et al (1976).

C. M. Jomaron; M. M. Dworetsky; D. A. Bohlender

1998-05-06T23:59:59.000Z

407

ALCHEMI Studies of Cation Site Occupancies in Doped Manganese ...  

Science Conference Proceedings (OSTI)

Advanced Heat Resistant Austenitic Stainless Steel and Composite Tube ... Corrosion Fatigue Studies of High Nickel Tubular Samples Containing Molten Salt ... Impact of Heat Transfer Media on Materials for Concentrated Solar Power.

408

High Temperature Properties and Fine Structure of High Manganese ...  

Science Conference Proceedings (OSTI)

concluded to be scarcely effective to the solut$on.hardening, as pointed by Kawabe etc. (9) regardi ng the effect of addition of boron to 18Cr-12Ni-0,2$&I steel.

409

Microstructure and Properties of Low Manganese API X70 Pipeline ...  

Science Conference Proceedings (OSTI)

The microstructure of thermomechanically processed X70 pipeline steel primarily consisted of acicular ferrite (AF) together with small fraction of polygonal ...

410

Research On Manganese Distribution between Slag and Hot Metal  

Science Conference Proceedings (OSTI)

... Forming Austenitic Stainless Steels for Structural Materials of Nuclear Power ... AND RESIDUAL STRESS FIELDS AND CRITICAL AND ALLOWABLE FLAW ...

411

Transition Metal Doping of Manganese Cobalt Spinel Oxides for ...  

Science Conference Proceedings (OSTI)

... Nanoparticle Catalysts for Hydrogen Production from Methanol and Methane ... of Long Term Aging on Creep Properties of HP Alloy Hydrogen Reformer Tubes ... of Traditionally Wrought Ni-Based Superalloys for USC Steam Turbines.

412

Biogeochemistry of manganese in ferruginous Lake Matano, Indonesia  

SciTech Connect

This study explores Mn biogeochemistry in a stratified, ferruginous lake, a modern analogue to ferruginous oceans. Intense Mn cycling occurs in the chemocline where Mn is recycled at least 15 times before sedimentation. The product of biologically catalyzed Mn oxidation in Lake Matano is birnessite. Although there is evidence for abiotic Mn reduction with Fe(II), Mn reduction likely occurs through a variety of pathways. The flux of Fe(II) is insufficient to balance the reduction of Mn at 125m depth in the water column, and Mn reduction could be a significant contributor to CH{sub 4} oxidation. By combining results from synchrotron-based X-ray fluorescence and X-ray spectroscopy, extractions of sinking particles, and reaction transport modeling, we find the kinetics of Mn reduction in the lake's reducing waters are sufficiently rapid to preclude the deposition of Mn oxides from the water column to the sediments underlying ferruginous water. This has strong implications for the interpretation of the sedimentary Mn record.

Jones, C.; Crowe, S.A.; Sturm, A.; Leslie, K.L.; MacLean, L.C. W.; Katsev, S.; Henny, C.; Fowle, D.A.; Canfield, D.E. (USD-Netherlands); (Kansas); (Saskatchewan); (UMM); (LIPI)

2012-12-13T23:59:59.000Z

413

Reduction and Separation of High Iron Content Manganese Ore and ...  

Science Conference Proceedings (OSTI)

Chemical Enrichment of Precious Metals in Iron Sulfides Using Microwave Energy · Chloridizing ... Co-Gasification Behavior of Metallurgical Coke with High and Low Reactivity .... Thermal Plasma Torches for Metallurgical Applications.

414

Effects of Iron and Manganese Ions on Potentiostatic Current ...  

Science Conference Proceedings (OSTI)

Differential Characterization of Ikperejere Iron shale and Iron Sandstone Deposit · Direct Precipitation of ... High Temperature Exposure of Oil Well Cements.

415

Compendium and synthesis of bacterial manganese reduction rates  

E-Print Network (OSTI)

generically as Mox ? Mred we can formulate a rate equation that mimics all three of these features as follows: d½Mred dt ¼ 0 t Mox K1=2þ½Mox t P tlag ( ð1� ½Mox þ ½Mred ¼ ½Mox0 þ ½Mred 0 ¼ ½Mtot ð2� where [Mred] and [Mox] are, respectively, concentrations of the reduced and oxidized metal over

Burgos, William

416

Dopant Segregation and Giant Magnetoresistance in Manganese-doped Germanium  

Science Conference Proceedings (OSTI)

Dopant segregation in a Mn{sub x}Ge{sub 1-x} dilute magnetic semiconductor leads to a remarkable self-assembly of Mn-rich nanocolumns, embedded in a fully compensated Ge matrix. Samples grown at 80 C display a giant positive magnetoresistance that correlates directly with the distribution of magnetic impurities. Annealing at 200 C increases Mn substitution in the host matrix above the threshold for the insulator-metal transition, while maintaining the columnar morphology, and results in global ferromagnetism with conventional negative magnetoresistance. The qualitative features of magnetism and transport in this nanophase material are thus extremely sensitive to the precise location and distribution of the magnetic dopants.

Li, An-Ping [ORNL; Zeng, Changgan [ORNL; van Benthem, Klaus [ORNL; Chisholm, Matthew F [ORNL; Shen, Jian [ORNL; Rao, Nageswara [ORNL; Dixit, Suvasis [ORNL; Feldman, Leonard C [ORNL; Petukhov, Andre G [ORNL; Foygel, M. [South Dakota School of Mines and Technology; Weitering, Harm H [ORNL; Gunter, Sandra Lynn [ORNL

2007-01-01T23:59:59.000Z

417

Metalloantibiotic Mn(II)-bacitracin complex mimicking manganese superoxide dismutase  

SciTech Connect

Superoxide dismutase (SOD) activities of various metallobacitracin complexes were evaluated using the riboflavin-methionine-nitro blue tetrazolium assay. The radical scavenging activity of various metallobacitracin complexes was shown to be higher than those of the negative controls, e.g., free transition metal ions and metal-free bacitracin. The SOD activity of the complex was found to be in the order of Mn(II) > Cu(II) > Co(II) > Ni(II). Furthermore, the effect of bacitracin and their complexation to metals on various microorganisms was assessed by antibiotic susceptibility testing. Moreover, molecular modeling and quantum chemical calculation of the metallobacitracin complex was performed to evaluate the correlation of electrostatic charge of transition metal ions on the SOD activity.

Piacham, Theeraphon [Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University, Bangkok 10700 (Thailand); Pure and Applied Biochemistry, Chemical Center, Lund University, P.O. Box 124, 22100 Lund (Sweden); Isarankura-Na-Ayudhya, Chartchalerm [Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University, Bangkok 10700 (Thailand); Nantasenamat, Chanin [Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University, Bangkok 10700 (Thailand); Yainoy, Sakda [Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University, Bangkok 10700 (Thailand); Ye Lei [Pure and Applied Biochemistry, Chemical Center, Lund University, P.O. Box 124, 22100 Lund (Sweden); Buelow, Leif [Pure and Applied Biochemistry, Chemical Center, Lund University, P.O. Box 124, 22100 Lund (Sweden); Prachayasittikul, Virapong [Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University, Bangkok 10700 (Thailand)]. E-mail: mtvpr@mucc.mahidol.ac.th

2006-03-24T23:59:59.000Z

418

Cell cycle-regulated manganese superoxide dismutase activity...  

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

activity via reversible phosphorylation Demet Candas 1 , Danupon Nantajit 1 , Ming Fan 1 , Jeffrey S. Murley 2 , Gayle Woloschak 3 , David J. Grdina 2 and Jian Jian Li 1 1...

419

Manganese-stabilized austenitic stainless steels for fusion applications  

DOE Patents (OSTI)

An austenitic stainless steel that is comprised of Fe, Cr, Mn, C but no Ni or Nb and minimum N. To enhance strength and fabricability minor alloying additions of Ti, W, V, B and P are made. The resulting alloy is one that can be used in fusion reactor environments because the half-lives of the elements are sufficiently short to allow for handling and disposal.

Klueh, Ronald L. (Knoxville, TN); Maziasz, Philip J. (Oak Ridge, TN)

1990-01-01T23:59:59.000Z

420

Arsenite Oxidation by a Poorly Crystalline Manganese-Oxide. 2.  

E-Print Network (OSTI)

carried out at the SSRL, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences. The SSRL Structural Molecular Biology Program

Sparks, Donald L.

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

A ROLE FOR MANGANESE IN OXYGEN EVOLUTION IN PHOTOSYNTHESIS  

DOE Green Energy (OSTI)

The prospects are shrinking rapidly for a future for society based on liquid hydrocarbons as a major source of energy. Among the wide array of alternative sources that are currently undergoing scrutiny, much attention is attracted to the photolysis of water to produce hydrogen and oxygen gases. Water, the starting material, does not suffer from lack of abundance, and there is every likelihood that the environmental consequences of water splitting will be negligible. Solar radiation is the obvious candiate for the ultimate energy source, but of course water cannot be photolyzed directly by the relatively low-energy wave-lengths, greater than 300 nm, that penetrate the earth's atmosphere. Nevertheless, the photolysis of water to produce O{sub 2} and reduced substances, with reduction potentials equivalent to that of H{sub 2}, is accomplished efficiently using sunlight by higher plant photosynthesis. There are even organisms that, under special conditions, will evolve H{sub 2} gas photosynthetically, but not efficiently when coupled with O{sub 2} production. To produce a molecule of O{sub 2} from water requires the removal of four electrons from two H{sub 2}O molecules.

Sauer, Kenneth

1980-01-01T23:59:59.000Z

422

A ROLE FOR MANGANESE IN OXYGEN EVOLUTION IN PHOTOSYNTHESIS  

E-Print Network (OSTI)

synthesis, Topics jn Photosynthesis, vol. 2, J. Barber,and J. R. Benemann, in Photosynthesis in Relation to ModelProcesses of Photosynthesis, Topics in Photosynthesis, vol.

Sauer, Kenneth

2012-01-01T23:59:59.000Z

423

Effects of Alloy Microstructure and Manganese Cobaltite Coatings ...  

Science Conference Proceedings (OSTI)

A21: First-Principles Molecular Dynamics Simulation of Chemical ... A3: Investigation on Co-combustion Kinetics of Anthracite Coal and Biomass Char by ... Lithium Redox Process for Thermochemical Water-Splitting as Energy Conversion.

424

Rapid Removal of Chlorine in Molten Salt Electrolysis of Magnesium ...  

Science Conference Proceedings (OSTI)

However, experimental data and modeling results in this study indicate that the ... bubbles on the current efficiency and the cell potential were investigated. ... High- Chloride Circuit for the Starfield Resources' Ferguson Lake Project · Direct Synthesis of Niobium Aluminides Powders by Sodiothermic Reduction in Molten Salts.

425

E-28: Friction Stir Welding of Magnesium Alloy Plate  

Science Conference Proceedings (OSTI)

... efficiency has begun to facilitate new mission critical application developments in ultra lightweight armored vehicles and other lightweight structures.

426

Magnesium transport extraction of transuranium elements from LWR fuel  

DOE Patents (OSTI)

A process of separating transuranium actinide values from uranium values present in spent nuclear oxide fuels which contain rare earth and noble metal fission products. The oxide fuel is reduced with Ca metal in the presence of CaCl.sub.2 and a U-Fe alloy containing not less than about 84% by weight uranium at a temperature in the range of from about 800.degree. C. to about 850.degree. C. to produce additional uranium metal which dissolves in the U-Fe alloy raising the uranium concentration and having transuranium actinide metals and rare earth fission product metals and the noble metal fission products dissolved therein. The CaCl.sub.2 having CaO and fission products of alkali metals and the alkali earth metals and iodine dissolved therein is separated and electrolytically treated with a carbon electrode to reduce the CaO to Ca metal while converting the carbon electrode to CO and CO.sub.2. The Ca metal and CaCl.sub.2 is recycled to reduce additional oxide fuel. The U-Fe alloy having transuranium actinide metals and rare earth fission product metals and the noble metal fission products dissolved therein is contacted with Mg metal which takes up the actinide and rare earth fission product metals. The U-Fe alloy retains the noble metal fission products and is stored while the Mg is distilled and recycled leaving the transuranium actinide and rare earth fission products isolated.

Ackerman, John P. (Downers Grove, IL); Battles, James E. (Oak Forest, IL); Johnson, Terry R. (Wheaton, IL); Miller, William E. (Naperville, IL); Pierce, R. Dean (Naperville, IL)

1992-01-01T23:59:59.000Z

427

analysis of casting defects in magnesium – aluminium – zinc direct ...  

Science Conference Proceedings (OSTI)

Jul 20, 2012 ... If the price of this product displays as $0.00 for your customer category, you may download it for free. You must, however, add it to your cart and ...

428

Dynamic Response of Magnesium Alloy AZ31B and Aluminum ...  

Science Conference Proceedings (OSTI)

Symposium, Measurements and Modeling of Advanced Automotive and Structural Materials at Intermediate and High Strain Rates. Presentation Title, Dynamic ...

429

Selective Laser Sintering of Magnesium Powder for Fabrication of ...  

Science Conference Proceedings (OSTI)

Cyclic Oxidation Behavior of Detonation Gun Sprayed Ni-20Cr Coating on a Boiler Steel at 900°C · Distortion Assessment of a Direct Cast Uranium - 6 wt.

430

142- Study on Synthesis Mechanism of Magnesium Ferrite by Non ...  

Science Conference Proceedings (OSTI)

125- Influence of Gas Flow Rate Ratio on the Structural Properties of a-SiC:H Prepared by ... 145- The Synergy of XRD and XRF in a Shale and Slate Analysis.

431

202- Selective Laser Sintering of Magnesium Powder for Fabrication ...  

Science Conference Proceedings (OSTI)

125- Influence of Gas Flow Rate Ratio on the Structural Properties of a-SiC:H Prepared by ... 145- The Synergy of XRD and XRF in a Shale and Slate Analysis.

432

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

Office of Scientific and Technical Information (OSTI)

Energy Management Expertise Energy Management Expertise Pumping System Assessment Tool Qualification PSAT helps users assess energy savings opportunities in pumping systems, relying on field measurements of flow rate, head, and either motor power or current to perform the assessment. AIRMaster+ Qualification AirMaster+ provides comprehensive information on assessing compressed AirMaster+ air systems, including modeling, existing and future system upgrades, and savings and effectiveness of energy efficiency measures. Processing Heating Assessment and Survey Tool Qualification (PHAST) PHAST assists users to survey process heating equipment and identify the most energy-intensive equipment and to perform energy (heat) balances on furnaces to identify and reduce non-productive energy use.

433

designing for assembly with thread forming fasteners in magnesium  

Science Conference Proceedings (OSTI)

Jul 20, 2012 ... This reduction in machining results in saved time as well as reduced costs for energy, tooling, and capital. In addition, a cored hole avoids ...

434

Correlated Nucleation of Precipitates in Magnesium Alloy WE54  

Science Conference Proceedings (OSTI)

First Principles Modeling of Shape Memory Alloy Magnetic Refrigeration Materials ... of Lithium Battery Materials LiMPO4 (M = Mn, Fe, Co, and Ni): A Comparative ... Forming-Crush Simulation Optimization Using Internal State Variable Model.

435

Stressing Out the Twins in Magnesium | Advanced Photon Source  

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

metals are known to undergo crystallographic twinning, when parts of a grain abruptly flip and create mirror-image copies of themselves. Because twinning also results in new...

436

Waste Heat Recovery Opportunities in a Magnesium Silicothermic ...  

Science Conference Proceedings (OSTI)

(Focus on Semi- Arid Climate) · Effect Of Batch Charging ... The Optimization of Gases and Thermal Energy in the Upper Zone of Electric Furnaces in Drenas.

437

Interdiffusion and Phase Growth Kinetics in the Magnesium ...  

Science Conference Proceedings (OSTI)

... p. 104 2. MA Dayananda and LR Ram-Mohan; MultiDiflux; Purdue University 380°C 24 hr ? MultiDiflux[2] program used for interdiffusion analysis ...

2013-07-02T23:59:59.000Z

438

Atomic Transition Probabilities of Sodium and Magnesium. A ...  

Science Conference Proceedings (OSTI)

... Rev. Lett. 76, 2866 1996. 73The Opacity Team, The Opacity Project IOP, Bristol, En- gland, 1994, Vol. I, http://legacy.gsfc.nasa.gov/topbase 77E. ...

2012-04-24T23:59:59.000Z

439

THE EXCHANGE OF RADIOACTIVE MAGNESIUM IN ERYTHROCYTES OF SEVERAL SPECIES  

SciTech Connect

Results are reported from in vivo and in vitro studies on the exchange of Mg/sup 2/ in erythrocytes of rats, dogs, cats, cattle, and man. Data are presented graphically. Results indicate that erythrocytes contain less Mg than other tissues and that Mg is very slowly exchanged. Possible mechanisms involved in Mg exchange are discussed. (C.H.)

Rogers, T.A.

1961-04-01T23:59:59.000Z

440

Method to decrease loss of aluminum and magnesium melts  

SciTech Connect

A method to minimize oxidation of metal during melting processes is provided, the method comprising placing solid phase metal into a furnace environ-ment, transforming the solid-phase metal into molten metal phase having a molten metal surface, and creating a barrier between the surface and the environment. Also provided is a method for isolating the surface of molten metal from its environment, the method comprising confining the molten metal to a controlled atmos-phere, and imposing a floating substrate between the surface and the atmosphere.

Hryn, John N. (Naperville, IL); Pellin, Michael J. (Naperville, IL); Calaway, Jr., Wallis F. (Woodridge, IL); Moore, Jerry F. (Naperville, IL); Krumdick, Gregory K. (Crete, IL)

2002-01-01T23:59:59.000Z

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.


441

Manufacture and Characterization of Magnesium Foams for Ultra ...  

Science Conference Proceedings (OSTI)

Author(s), Tillmann Plorin, Dirk Bormann, Friedrich-Wilhelm Bach. On-Site Speaker (Planned), Tillmann Plorin. Abstract Scope, In the project introduced here, ...

442

Effect of Uncombined Calcium and Magnesium on the Malleability of ...  

Science Conference Proceedings (OSTI)

during forging at 76O*C and 980°C could be traced directly to fracturing of the brittle. NiaMg particles which remained undissolved at those temperatures. 25mm.

443

Ultra Light Metallic Armor (ULMA)- Magnesium Hard Alloys as the ...  

Science Conference Proceedings (OSTI)

Optimization of these aspects of materials production, as well as joining and high strain rate testing, are being carried out in partnership with the Edison Welding ...

444

Low-temperature synthesis of magnesium chromite spinel via ...  

Science Conference Proceedings (OSTI)

Chemie, Weinheim, 1981) p. 105. 6. S.J. GREGG and K. S. W. SING, "Adsorption, surface area and porosity" (Academic Press, London, 1967) pp. 3,. 309. 7.

445

Recovery of Magnesium from Waste Effluent in Nickel Laterite ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Eliminating the environmental threat caused by waste ... Characterization of the Chemical Changes and Surface Properties of Carbonated Waste Cement ... Flux for Basic Oxygen Steel Making Using Waste Oxides of Steel Plant ... Heat Treatment of Black Dross for the Production of a Value Added Material ...

446

The USAMP Magnesium Front End Research and Development ...  

Science Conference Proceedings (OSTI)

... shock tower, extruded AM30 rail and a warm-formed AZ31 sheet component. .... Effects of Alloying Elements and Cooling Rate on Morphology of Phases in ...

447

High Strength Magnesium Alloys as Light Weight Advanced ...  

Science Conference Proceedings (OSTI)

Morphological Forms of Phosphogypsum Depending on Modification Approaches in Using as Mineral Filler for Polymer Composites · Nanostructured ...

448

Review on Recycling of Light Metals (Magnesium and Aluminum)  

Science Conference Proceedings (OSTI)

Selective Recovery of Gold from E-wastes by Using Cellulosic Wastes · Stabilization of Chromium-Based Slags with FeS2 and FeSO4 · Sulphide Precipitation ...

449

Study on Preparation of High-Purity Magnesium Carbonate Whisker ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Mg(HCO3)2 solution was prepared through light burning, hydrous ... Extracting Al2O3 from Coal Gangue by Carbonthermal Reduction - Alkaline ...

450

Warm Bending Magnesium Sheet for Automotive Closure Panels  

Science Conference Proceedings (OSTI)

For automotive production, hemming equipment would be augmented with a rapid heating technology to locally heat the bend region, complete the hem and ...

451

Three-photon above-threshold ionization of magnesium  

Science Conference Proceedings (OSTI)

Three-photon ionization cross sections from the ground state, and two-photon ionization from the 3 {sup 1}P(3s3p) state have been calculated for Mg in the region between the 3p and 4s ionization thresholds. These processes include an above-threshold ionization process for the last absorbed photon. We have used the Green's-function method in the Feshbach formalism and an L{sup 2} close coupling approach, with a basis of L{sup 2} integrable B-spline functions. We report the positions, widths, and assignments of a number of relevant {sup 1}P{sup o} and{sup 1}F{sup o} doubly excited Feshbach states. We also observe unusually high cross sections due to a bound-bound transition from the 3 {sup 1}S(3s{sup 2}) to the 3 {sup 1}P(3s3p) state, a core excitation process, and the population of an intermediate doubly excited state. Both total cross sections and angular distributions are reported.

Reber, A.; Berry, R.S. [Department of Chemistry and James Franck Institute, University of Chicago, Chicago, Illinois 60637 (United States); Martin, F. [Departamento de Quimica C-9, Universidad Autonoma de Madrid, 28049 Madrid (Spain); Bachau, H. [Centre des Lasers Intenses et Applications (UMR 5107 du CNRS), Universite de Bordeaux I, 351 Cours de la Liberation, F-33405 Talence (France)

2003-12-01T23:59:59.000Z

452

Switchable mirrors based on nickel–magnesium ?lms  

line electrolyte ~5–8 M KOH, Pt counter electrode, HgO/Hg reference!, with in situ measurement of optical transmission spectra or photopic transmittance.

453

A Systematic Study of the Grain Refinement of Magnesium by ...  

Science Conference Proceedings (OSTI)

Variables included the amount of zirconium, the pouring temperature, and the holding time prior to casting. Samples were poured into a special “hockey puck” ...

454

Extrusion Modeling of AM30 Magnesium Alloy - Programmaster.org  

Science Conference Proceedings (OSTI)

... compared well with the load-displacement curve, the temperature histories, .... First Principles Modeling of Shape Memory Alloy Magnetic Refrigeration Materials ... Microstructure Engineering of the Heat Affected Zone in Linepipe Steels.

455

Effect of Magnesium Doping on the Structure, Particle Size and ...  

Science Conference Proceedings (OSTI)

Synthesis and Characterization of Plasma Polymerized Thin Films Deposited from Benzene and Hexamethyldisiloxane Using (PECVD) Method · Synthesis and ...

456

C1 Technology of Molten salt Electrolysis of Magnesium Chloride  

Science Conference Proceedings (OSTI)

D14 Gold Nanoparticles in Red Ruby Glasses Used for Decoration in Thailand · D15 Soft Magnetic Properties of Nanocrystalline Fe-based P/M Cores Mixed ...

457

Magnesium Technology 2013 Poster Session - Programmaster.org  

Science Conference Proceedings (OSTI)

Mar 4, 2013 ... Each source of waste heat is listed together with the assessment for potential cogeneration or direct recovery. The overall impact on energy ...

458

PII-56: Multi-Objective Optimization of Wrought Magnesium Alloy ...  

Science Conference Proceedings (OSTI)

Specifically, we have developed an integrated modeling and optimization framework in ... Model Validation for Microstructural Sensitivities Using High Energy ...

459

Nanostructured Magnesium Hydride Prepared by Cold Rolling and ...  

Science Conference Proceedings (OSTI)

Carbothermal Production of Zrb2-Zro2 Composite Powder from Zro2-B2O3/B System ... Fiber and Electron-Beam Irradiation in Thermo-Mechanical Properties of HDPE ... with Malealated Polypropylene (MAPP) Produced by Reactive Extrusion.

460

Magnesium Components Achieve Weight Reduction and Fuel Savings  

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

cast mag- nesium can achieve consider- able weight reduction advantages over both steel and aluminum. Furthermore, this favorable weight reduction potential can enable...

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

Recovery of Magnesium and Recycling of Spent Solution in ...  

Science Conference Proceedings (OSTI)

Sorption of Se(IV) and Se(VI) Ions onto Biomass Ash ... Tellurium Supply Sensitivity to Growth of Non-Traditional Copper Extraction Techniques - Implications for ...

462

Magnesium transport extraction of transuranium elements from LWR fuel  

SciTech Connect

This report discusses a process of separating transuranium actinide values from uranium values present in spent nuclear oxide fuels which contain rare earth and noble metal fission products. The oxide fuel is reduced with Ca metal in the presence of CaCl{sub 2} and a U-Fe alloy containing not less than about 84% by weight uranium at a temperature in the range of from about 800{degrees}C to about 850{degrees}C to produce additional uranium metal which dissolves in the U-Fe alloy raising the uranium concentration and having transuranium actinide metals and rare earth fission product metals and the noble metal fission products dissolved therein. The CaCl{sub 2} having CaO and fission products of alkali metals and the alkali earth metals and iodine dissolved therein is separated and electrolytically treated with a carbon electrode to reduce the CaO to Ca metal while converting the carbon electrode to CO and CO{sub 2}. The Ca metal and CaCl{sub 2} is recycled to reduce additional oxide fuel. The U-Fe alloy having transuranium actinide metals and rare earth fission product metals and the noble metal fission products dissolved therein is contacted with Mg metal which takes up the actinide and rare earth fission product metals. The U-Fe alloy retains the noble metal fission products and is stored while the Mg is distilled and recycled leaving the transuranium actinide and rare earth fission products isolated.

Ackerman, J.P.; Battles, J.E.; Johnson, T.R.; Miller, W.E.; Pierce, R.D.

1991-12-31T23:59:59.000Z

463

Diffusion in Magnesium with Dilute Alloying Addition of Aluminum ...  

Science Conference Proceedings (OSTI)

Materials Genomics Past & Future: From CALPHAD to Flight · Microstructure Stability of Multi-Materials Systems with Adaptive Microstructures · Modeling of ...

464

C46 Development of Wrought Magnesium Alloys by an Improved ...  

Science Conference Proceedings (OSTI)

J8 Microstructure and Properties of Ni-Based Nano-Self Lubricating Coating ... L18 The Effects of Cryogenic Milling and Catalytic Additives on the Hydrogen ...

465

Solid-state Additive Manufacturing of Aluminum and Magnesium ...  

Science Conference Proceedings (OSTI)

Symposium, Advanced Materials, Processes and Applications for Additive Manufacturing ... Lubricants in Deposition and Machining of Wire and Arc Additive ...

466

Recent Developments in Alloy Design of Magnesium Wrought Alloys  

Science Conference Proceedings (OSTI)

Mathematical Modeling of Coke Bed Gasification ... Mechanical Properties and Biocompatibility in-vitro and in-vivo of Plasma Sprayed Carbon Nanotube ...

467

Friction Stir Welding of Magnesium Alloys to Steel  

Science Conference Proceedings (OSTI)

EPRI P87, A New Filler Material for Dissimilar Metal Welds · Explosive Bonding of 316L to C18150 CuCrZr Alloy for ITER Applications · Failure Mechanisms of ...

468

Bonding Mechanism of Cold Spray Coating on Magnesium Alloys  

Science Conference Proceedings (OSTI)

Cold Sprayed Aluminum Based Glassy Coatings for Improved Corrosion and Wear ... Effect of Thermal Cycling and Sliding on the Structure of Cu-Nb Nanolaminates ... Based on Oscillatory Voltage Wave Forms for Insulating Film Depositions.

469

Science, Technology and Application of Magnesium and its Alloys  

Science Conference Proceedings (OSTI)

... meals, and lodging) undertaken to maintain and improve professional skills. For more information concerning applicability, contact your local Internal Revenue ...

470

Process for modifying the metal ion sorption capacity of a medium  

DOE Patents (OSTI)

A process for modifying a medium is disclosed that includes treating a medium having a metal ion sorption capacity with a solution that includes: A) an agent capable of forming a complex with metal ions; and B) ions selected from the group consisting of sodium ions, potassium ions, magnesium ions, and combinations thereof, to create a medium having an increased capacity to sorb metal ions relative to the untreated medium.

Lundquist, Susan H. (White Bear Township, MN)

2002-01-01T23:59:59.000Z

471

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. Ethylenediamine was detected in a degraded solution of MEA/PZ solution, suggesting that piperazine is subject to oxidation. Stripper modeling has demonstrated that vacuum strippers will be more energy efficient if constructed short and fat rather than tall and skinny. The matrix stripper has been identified as a configuration that will significantly reduce energy use. Extensive measurements of CO{sub 2} solubility in 7 m MEA at 40 and 60 C have confirmed the work by Jou and Mather. Corrosion of carbon steel without inhibitors increases from 19 to 181 mpy in lean solutions of 6.2 m MEA/PZ as piperazine increases from 0 to 3.1 m.

Gary T. Rochelle; Eric Chen; Babatunde Oyenekan; Andrew Sexton; Jason Davis; Marcus Hilliard; Amornvadee Veawab

2006-09-30T23:59:59.000Z

472

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

losses. The activation loss is caused by the kinetics of the chemical reactions taking place at the fuel in applications ranging from combined heat and power to reliability enhance- ment. This trend has motivated. In particular, solid oxide fuel cells (SOFCs) are well suited to stationary applications where

Rochelle, Gary T.

473

Ferroelectricity in Fused Potassium Nitrate-Polymer Composite Films  

Science Conference Proceedings (OSTI)

The composite films of KNO3-PVA have been prepared by solvant cast technique and then fused over the brass substrate. The ferroelectric hysteresis loops ...

474

Mid-infrared femtosecond optical parametric amplification in potassium niobate  

Science Conference Proceedings (OSTI)

We generated synchronized sub-200-fs pulses between 3 and 4.4{mu}m at a 1-kHz repetition rate by pumping a KNbO{sub 3} optical parametric amplifier with a femtosecond Ti:sapphire regenerative amplifier and seeding it by narrow-band quasi-cw radiation. Output idler energies as high as 7{mu}J at 4{mu}m are reported from this extremely simple single-stage device, which correspond to amplification factors as high as 3{times}10{sup 5} and a conversion efficiency of 15. {copyright} {ital 1996 Optical Society of America.}

Petrov, V.; Noack, F. [Max Born Institute for Nonlinear Optics and Ultrafast Spectroscopy, Rudower Chaussee 6, D-12474 Berlin (Germany)

1996-10-01T23:59:59.000Z

475

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 pilot plant data have been reconciled using 17% inlet CO{sub 2}. A rate-based model demonstrates that the stripper is primarily controlled by liquid film mast transfer resistance, with kinetics at vacuum and diffusion of reactants and products at normal pressure. An additional major unknown ion, probably glyoxylate, has been observed in MEA degradation. Precipitation of gypsum may be a feasible approach to removing sulphate from amine solutions and providing for simultaneous removal of CO{sub 2} and SO{sub 2}. Corrosion of carbon steel in uninhibited MEA solution is increased by increased amine concentration, by addition of piperazine, and by greater CO{sub 2} loading.

Gary T. Rochelle; Eric Chen; Babatunde Oyenekan; Andrew Sexton; Jason Davis; Marcus Hilliard; Amorvadee Veawab

2006-07-28T23:59:59.000Z

476

The Effect of Potassium Dichromate Addition on Sulfuric Acid ...  

Science Conference Proceedings (OSTI)

A Sintering Ore Blending Optimization Model Based on 'Iron Increase and Silicon ... D21: Maximum Rate of Pulverized Coal Injection into Blast Furnace with ...

477

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

The University of Texas at Austin #12;2 Disclaimer This report was prepared as an account of work sponsored demonstrated that vacuum strippers will be more energy efficient if constructed short and fat rather than tall and skinny. The matrix stripper has been identified as a configuration that will significantly reduce energy

Rochelle, Gary T.

478

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

of Texas at Austin #12;Disclaimer This report was prepared as an account of work sponsored by an agency 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

Rochelle, Gary T.

479

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

DOE Award #: DE-FC26-02NT41440 Department of Chemical Engineering The University of Texas at Austin 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

Rochelle, Gary T.

480

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

E-Print Network (OSTI)

career on process optimization and control, fluid mechanics, the analysis of coal gasification reactors my earlier work on coal gasification reactors, polymer fiber spinning, and the activated sludge

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

Biogenic Potassium Salt Particles as Seeds for Secondary Organic  

E-Print Network (OSTI)

performance computer codes" International Association for Hydraulic Research 7th Cooling tower and spray pond THE NATURAL DRAFT COOLING TOWER PERFORMANCE Ghulam Amur, Brian Milton, John Reizes, Jafar Madadnia, Simon Australia (Ghulam.Amur@uts.edu.au) Abstract The effect of wind on the performance of a cooling tower has

482

Nuclear charge radii of potassium isotopes beyond N=28  

E-Print Network (OSTI)

We report on the measurement of optical isotope shifts for $^{38,39,42,44,46\\text{-}51}$K relative to $^{47}$K from which changes in the nuclear mean square charge radii across the N=28 shell closure are deduced. The investigation was carried out by bunched-beam collinear laser spectroscopy at the CERN-ISOLDE radioactive ion-beam facility. Mean square charge radii are now known from $^{37}$K to $^{51}$K, covering all $\

Kreim, K; Papuga, J; Blaum, K; De Rydt, M; Ruiz, R F Garcia; Goriely, S; Heylen, H; Kowalska, M; Neugart, R; Neyens, G; Nörtershäuser, W; Rajabali, M M; Alarcón, R Sánchez; Stroke, H H; Yordanov, D T

2013-01-01T23:59:59.000Z

483

Soil, Water and Forage Testing Laboratory Potassium recommendations applicable for  

E-Print Network (OSTI)

on 3-30-2012: soiltesting.tamu.edu CANOLA (1000 LBS/A) 120 110 100 90 80 75 70 65 60 50 40 CANOLA (1250 LBS/A) 120 110 100 90 80 75 70 65 60 50 40 CANOLA (1500 LBS/A) 120 110 100 90 80 75 70 65 60 50 40 CANOLA (1750 LBS/A) 140 125 115 105 95 85 80 75 70 60 50 CANOLA (2000 LBS/A) 140 125 115 105 95 85 80 75

484

Summary of potassium/argon age dating, 1979  

DOE Green Energy (OSTI)

During FY-79 the K/Ar dating laboratory at the Department of Geology and Geophysics of the University of Utah became operational. During the past calendar year forty-seven dates have been produced from areas predominantly in Utah. Dating has also been done on areas in Nevada and Montana through the State-Coupled program and Case Studies Support program. Areas in wich activity was concentrated include: Cove Creek Domes/Twin Peaks Area, SW Utah. Here volcanic activity spanned the time from 2.74 to 2.35 M.Y., with a mean age of 2.50 +- 0.14 M.Y. Black Rock Desert, SW Utah. Two dates on a single flow indicate an age of 1.49 +- 0.08 M.Y. for a flow previously undated. Wildcat Creek Area, SW Utah. Dating of rhyolite flows from this area gives a mean age of volcanism of 9.25 +- 0.16 M.Y., considerably older than previously inferred by the work of Haugh (1978). Mineral Mountains Pluton, SW Utah. Twelve dates on phases of the pluton indicate a complex history of intrusion, and more work is indicated in order to derive a coherent picture of the magmatic events leading to the formation of this batholith. Blackfoot Reservoir, Idaho. Two dates on rhyolite domes, previously updated, give ages of 1.56 +- 0.06 M.Y. and 1.28 +- 0.15 M.Y.

Evans, S.H. Jr.

1980-02-01T23:59:59.000Z

485

Preparation of Potassium Ferrate by Hypochlorite Oxidation Method  

Science Conference Proceedings (OSTI)

Stabilization of Chromium-based Slags with MgO · Study on the EMD Residue and Shale for Preparing Solidification Brick · Study on the In-Situ Remediation of

486

Synthesis and characterization of the potassium jarosite analogue ...  

Science Conference Proceedings (OSTI)

Chromium integrated in the structure could influence the jarosite's solubility, potentially .... Processing and Mechanical Behavior of Unalloyed Plutonium.

487

Lithium, Potassium, and Sodium Additions to Cement Pastes  

Science Conference Proceedings (OSTI)

... Cement and Concrete Research 2004, 34, 2045-2056. 16. CRC Handbook of Chemistry and Physics. CRC Press, 1987. 17. ...

2011-02-02T23:59:59.000Z

488

Impedance Spectroscopic Investigation of CuO-Added Potassium ...  

Science Conference Proceedings (OSTI)

Energy Harvesting Utilized Resonance Phenomena of Piezoelectric Unimorph · Estimating Flexoelectric Properties of Piezoelectric Crystals: Utilization of a ...

489

Mechanical Properties and Microstructure of Potassium-Based ...  

Science Conference Proceedings (OSTI)

Geopolymers have shown promise as a low cost, environmentally friendly ... SiC Fiber Strengths after Oxidation in Wet and Dry Air, Steam, and Low pO2.

490

Assessment of arsenic mobility in the soils of some golf courses in South Florida  

E-Print Network (OSTI)

High concentrations of arsenic have been detected in soils and underlying groundwater of some South Florida golf courses, indicating the possible impact of the application of arsenic-containing herbicides.The mobility of arsenic in the soils from selected golf courses was studied using a simple two-step sequential extraction procedure.Sodium nitrate (0.1 M), potassium dihydrogen phosphate (0.1 M) and concentrated nitric acid were used to obtain mobile, mobilizable, and pseudo total arsenic fractions.Soils were separated into fine (-0.25 mm) and large (0.25–0.75 2 mm) particle size fractions.Arsenic contents were correlated with the distribution of iron (R s0.4827), manganese 2 2 (R s0.7674) and aluminum (R s5459) in the particle size fractions, while such correlation was not observed for soil organic matter, indicating that the oxidesyhydroxides of iron, manganese and aluminum control the distribution of arsenic in these soils.Sodium nitrate and potassium dihydrogen phosphate extractants used in this study extracted large portions of arsenic from most soil samples studied.This is especially true for the fine fraction where the extractable arsenic ranged from 9.2 to 51.3 % with an average of 28.7"13.3%, whereas in the large fraction, arsenic ranged from 7.2 to 24.7 % with an average of 15.4"6.4%. These extractants, however, release only small amounts of iron, manganese, and aluminum.It seems likely that arsenic can be released by sodium nitrate and potassium dihydrogen phosphate without significant dissolution of the oxidesyhydroxides of iron, manganese, and aluminum in

Yong Cai; Julio C. Cabrera; Myron Georgiadis; Krish Jayach

2001-01-01T23:59:59.000Z

491

Superconducting composite with multilayer patterns and multiple buffer layers  

DOE Patents (OSTI)

An article of manufacture is described including a substrate, a patterned interlayer of a material selected from the group consisting of magnesium oxide, barium-titanium oxide or barium-zirconium oxide, the patterned interlayer material overcoated with a secondary interlayer material of yttria-stabilized zirconia or magnesium-aluminum oxide, upon the surface of the substrate whereby an intermediate article with an exposed surface of both the overcoated patterned interlayer and the substrate is formed, a coating of a buffer layer selected from the group consisting of cerium oxide, yttrium oxide, curium oxide, dysprosium oxide, erbium oxide, europium oxide, iron oxide, gadolinium oxide, holmium oxide, indium oxide, lanthanum oxide, manganese oxide, lutetium oxide, neodymium oxide, praseodymium oxide, plutonium oxide, samarium oxide, terbium oxide, thallium oxide, thulium oxide, yttrium oxide and ytterbium oxide over the entire exposed surface of the intermediate article, and, a ceramic superconductor. 5 figures.

Wu, X.D.; Muenchausen, R.E.

1993-10-12T23:59:59.000Z

492

Purification of silicon by the silicon fluoride transport process. Thermochemical study  

DOE Green Energy (OSTI)

A computer-assisted thermochemical equilibrium analysis was conducted for the silicon transport reaction: Si(s) + SiF/sub 4/(g) = (intermediates) = Si(s) + SiF/sub 4/(g). The calculations indicated that a substantial transport rate should be possible at temperatures of 1700/sup 0/K and one atmosphere pressure. Computations were made to determine whether the elemental impurities present in metallurgical-grade silicon would transfer in this process. It was concluded that aluminum, chromium, copper, iron, manganese, molybdenum, nickel, vanadium, and zirconium would not transfer, but that boron, magnesium, phosphorus, and titanium would transfer.

Rhein, R.A.

1979-04-15T23:59:59.000Z

493

Primary explosives  

SciTech Connect

The present invention provides a compound of the formula (Cat).sup.+.sub.z[M.sup.++(5-nitro-1H-tetrazolato-N2).sup.-.sub.x(H.sub.2- O).sub.y] where x is 3 or 4, y is 2 or 3, x+y is 6, z is 1 or 2, and M.sup.++ is selected from the group consisting of iron, cobalt, nickel, copper, zinc, chromium, and manganese, and (Cat).sup.+ is selected from the group consisting of ammonium, sodium, potassium, rubidium and cesium. A method of preparing the compound of that formula is also disclosed.

Hiskey, Michael A. (Los Alamos, NM); Huynh, My Hang V. (Los Alamos, NM)

2011-01-25T23:59:59.000Z

494

Primary explosives  

SciTech Connect

The present invention provides a compound of the formula (Cat).sup.+.sub.z[M.sup.++(5-nitro-1H-tetrazolato-N2).sup.-.sub.x(H.sub.2- O).sub.y] where x is 3 or 4, y is 2 or 3, x+y is 6, z is 1 or 2, and M.sup.++ is selected from the group consisting of iron, cobalt, nickel, copper, zinc, chromium, and manganese, and (Cat).sup.+ is selected from the group consisting of ammonium, sodium, potassium, rubidium and cesium. A method of preparing the compound of that formula is also disclosed.

Hiskey, Michael A. (Los Alamos, NM); Huynh, My Hang V. (Los Alamos, NM)

2009-03-03T23:59:59.000Z

495

Lithium In Tufas Of The Great Basin- Exploration Implications For  

Open Energy Info (EERE)

In Tufas Of The Great Basin- Exploration Implications For In Tufas Of The Great Basin- Exploration Implications For Geothermal Energy And Lithium Resources Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Lithium In Tufas Of The Great Basin- Exploration Implications For Geothermal Energy And Lithium Resources Details Activities (8) Areas (4) Regions (0) Abstract: Lithium/magnesium, lithium/sodium, and to a lesser extent, potassium/magnesium ratios in calcium carbonate tufa columns provide a fingerprint for distinguishing tufa columns formed from thermal spring waters versus those formed from non-thermal spring waters. These ratios form the basis of the Mg/Li, Na/Li, and K/Mg fluid geothermometers commonly used in geothermal exploration, which are based on the fact that at elevated temperatures, due to mineral-fluid equilibria, lithium

496

Mixed Metal Films with Switchable Optical Properties  

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

Mixed Metal Films with Switchable Optical Properties Mixed Metal Films with Switchable Optical Properties Title Mixed Metal Films with Switchable Optical Properties Publication Type Journal Article LBNL Report Number LBNL-49043 Year of Publication 2001 Authors Richardson, Thomas J., Jonathan L. Slack, Baker Farangis, and Michael D. Rubin Journal Applied Physics Letters Volume 80 Pagination 1349-1351 Call Number LBNL-49043 Abstract Thin, Pd-capped metallic films containing magnesium and first row transition metals (Mn, Fe, Co) switch reversibly from their initial reflecting state to visually transparent states when exposed to gaseous hydrogen or following reduction cathodic polarization in an alkaline electrolyte. Reversion to the reflecting state is achieved by exposure to air or by anodic polarization. The films were prepared by co-sputtering from one magnesium target and one manganese, iron, or cobalt target. Both the dynamic optical switching range and the speed of the transition depend on the magnesium-transition metal ratio. Infrared spectra of films in the transparent, hydrided (deuterided) states support the presence of the intermetallic hydride phases Mg3MnH7, Mg2FeH6, and Mg2CoH5.

497

Reduction of Agglomerated Manganese Ores In a 150KW pilot scale ...  

Science Conference Proceedings (OSTI)

Electricity-independent Generation of Si Based on the Use of Rice Husk: A Process Concept · Energy consumption of metal electrowinning: an optimization.

498

Synthesis and Characterization of 14-1-11 Ytterbium Manganese Antimonide Derivatives for Thermoelectric Applications  

E-Print Network (OSTI)

Propulsion Laboratory, California Institute of Technology under contract with the National Aeronautics and Space

Star, Kurt

2013-01-01T23:59:59.000Z

499

Synthesis and Characterization of Lithium Manganese Phosphate by a precipitation method  

DOE Green Energy (OSTI)

LiMnPO4 is synthesized from MnPO4•H2O precursor precipitated via a spontaneous reaction. These MnPO4•H2O nano-plates react quickly with the lithium source and form a pure phase of LiMnPO4 that has good electrochemical properties. Thermogravimetric analysis (TGA) was used to determine the optimum synthesis temperature. It is found that the crystallization of LiMnPO4 occurs before 438°C. After full nucleation at 550°C, the samples exhibit a discharge capacity of 115mAh/g (C/20 rate, 2.5-4.4 V) in the first cycle. The Coulombic efficiency is maintained at near 100% after the first few cycles.When the synthesis temperature decreases to 350°C, the particle size of the LiMnPO4 is further reduced to 10-50 nm with a reversible capacity of more than 90 mAh/g. For 550°C-synthesized LiMnPO4, 73% of the initial capacity is retained at the sixtieth cycle. After high rate (5C) discharge, the reversible capacity of the LiMnPO4 can be recovered to nearly the original value of 110 mAh/g at the C/20 rate. This precipitation method provides a cost effective approach for manufacturing high-performance LiMnPO4 cathode material for Li-ion batteries.

Xiao, Jie; Xu, Wu; Choi, Daiwon; Zhang, Jiguang

2009-12-11T23:59:59.000Z

500

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

E-Print Network (OSTI)

in aqueous solution for Pu(VI) taken from Guillaumont etTable 3. Least-squares fits of Pu L III -edge XANES data toIV) Figure 4. Energy (eV) Pu Solution Speciation pH Figure

Hu, Yung-Jin

2011-01-01T23:59:59.000Z