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Note: This page contains sample records for the topic "ura ni um" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


1

Genome Rearrangement: A Planning Approach Tansel Uras and Esra Erdem  

E-Print Network [OSTI]

Genome Rearrangement: A Planning Approach Tansel Uras and Esra Erdem Faculty of Engineering be reconstructed by pair- wise comparison of their entire genomes. Such a comparison can be quantified by determining the number of events that change the order of genes in a genome. Earlier Erdem and Tillier

Erdem, Esra

2

Genome Rearrangement and Planning: Revisited Tansel Uras and Esra Erdem  

E-Print Network [OSTI]

Genome Rearrangement and Planning: Revisited Tansel Uras and Esra Erdem Faculty of Engineering be reconstructed by pair- wise comparison of their entire genomes. Such a comparison can be quantified by determining the number of events that change the order of genes in a genome. Earlier Erdem and Tillier

Erdem, Esra

3

Land Use and natUraL resoUrces  

E-Print Network [OSTI]

in other areas. Students in our Green Building and Sustainable Design and Renewable Energy certificate1 Land Use and natUraL resoUrces Fall 2013 Including: Mitigation and Conservation Banking Climate.....................................................................................8 NEW · Mitigation and Conservation Banking

California at Davis, University of

4

Land Use and natUraL resoUrces  

E-Print Network [OSTI]

..........................................................................9 natUraL resoUrces Cultural Resource Management: CEQA, NEPA and Section 106 Extension is expanding its Land Use and Natural Resource Planning portfolio to include courses (with and Natural Resource Planning portfolio can help you be more effective in achieving your goals. Julia Lave

Ferrara, Katherine W.

5

U.S. DEPARTIVEENT OF ENERGY EERE PROJECT MANAGEMENT CENTER NEPA DE 'URA TTNATION  

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

E E na U.S. DEPARTIVEENT OF ENERGY EERE PROJECT MANAGEMENT CENTER NEPA DE 'URA TTNATION RECIPIENT:Texas Tech University STATE: TX PROJECT TITLE : Great Plains Wind Power Test Facility Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number CID Number CDP DE-FG36-06G086092 GFO-06-126 -001 0 Based on my review of the information concerning the proposed action, as NEPA Compliance Officer (authorized under DOE Order 451.IA), 1 have made the following determination: CX, EA, EIS APPENDIX AND NUMBER: Description: B3.1 Onsite and offsite site characterization and environmental monitoring, including siting, construction (or modification),. operation, and dismantlement or closing (abandonment) of characterization and monitoring devices and siting,

6

Um Realismo Mágico no Brasil?: Um Levantamento  

E-Print Network [OSTI]

Um Realismo Mágico no Brasil? : Um Levantamento A questãoDaí a declarar se existe Brasil é outro passo complicado.inclusão da literatura do Brasil nesta manifestação cultural

Young, Theodore Robert

1995-01-01T23:59:59.000Z

7

Giant Quadrupole-Resonance in Ni Isotopes  

E-Print Network [OSTI]

Inelastic scattering of 129 MeV alpha particles has been used to excite the giant quadrupole resonance in Ni-58, Ni-60, Ni-62, Ni-64. The resonance was found to exhaust 58 +/- 12%, 76 +/- 14%, 78 +/- 14%, and 90 +/-16% of the E2 energy-weighted sum...

Youngblood, David H.; Lui, YW; Garg, U.; Peterson, R. J.

1992-01-01T23:59:59.000Z

8

Bulk Migration of Ni/NiO in Ni-YSZ during Reducing Conditions...  

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

random grain orientation. The surface analysis and mapping were carried out using ToF-SIMS and AES whereas EDS maps on FIB sliced areas on Ni-YSZ were utilized for the bulk...

9

The Obviative Suffix -ni- In Algonquian  

E-Print Network [OSTI]

the marker -ni- is used specifically when an argument has been established as obviative earlier in the discourse. By tracing -ni- in the morphology of Fox and Kickapoo and in Bloomfield's comparative Algonquian work (Bloomfield 1946), the present paper...

Gathercole, Geoffrey

1979-01-01T23:59:59.000Z

10

Monopole Strength in Ni-58  

E-Print Network [OSTI]

PHYSICAL REVIEW C VOLUME 44, NUMBER 5 Monopole strength in Ni NOVEMBER 1991 D. H. Youngblood and Y.-W. Lui Cyclotron Institute, Texas AdkM Uni Uersi ty, College Station, Texas 77843 (Received 20 June 1991) Differential cross-section data from... of Ener- gy under Grant No. DE-FG05-86ER40256. MONOPOLE STRENGTH IN "Ni 1881 [1]D. H. Youngblood, P. Bogucki, J. D. Bronson, U. Garg, Y.-W. Lui, and C. M. Rozsa, Phys. Rev. C 23, 1997 (1981). [2] M. Buenerd, J. Phys. C 4, 115 (1984). [3] S...

Youngblood, David H.; Lui, YW.

1991-01-01T23:59:59.000Z

11

STRATEGIC PLAN UM 2020: BUILDING A UNIVERSITY  

E-Print Network [OSTI]

, event, and support space); and Information technology (instruction and research technology, computers, and service learning in higher education. UM's emphasis on student engagement has earned it the Community on the national President's Higher Education Community Service Honor Roll. UM has significantly enhanc

Chu, Xi

12

Kinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation  

SciTech Connect (OSTI)

The kinetics of Ni sorption to two Delaware agricultural soils were studied to quantitatively assess the relative importance of Ni adsorption on soil organic matter (SOM) and the formation of Ni layered double hydroxide (Ni-LDH) precipitates using both experimental studies and kinetic modeling. Batch sorption kinetic experiments were conducted with both soils at pH 6.0, 7.0, and 7.5 from 24 h up to 1 month. Time-resolved Ni speciation in soils was determined by X-ray absorption spectroscopy (XAS) during the kinetic experiments. A kinetics model was developed to describe Ni kinetic reactions under various reaction conditions and time scales, which integrated Ni adsorption on SOM with Ni-LDH precipitation in soils. The soil Ni speciation (adsorbed phases and Ni-LDH) calculated using the kinetics model was consistent with that obtained through XAS analysis during the sorption processes. Under our experimental conditions, both modeling and XAS results demonstrated that Ni adsorption on SOM was dominant in the short term and the formation of Ni-LDH precipitates accounted for the long-term Ni sequestration in soils, and, more interestingly, that the adsorbed Ni may slowly transfer to Ni-LDH phases with longer reaction times.

Shi, Zhenqing; Peltier, Edward; Sparks, Donald L. (Delaware); (Kansas)

2012-12-10T23:59:59.000Z

13

Ni Sorption on Pyrophyllite: Evidence for the Formation of Ni-Al Hydroxide and Its Transformation into Ni-Silicate by Visible,  

E-Print Network [OSTI]

Ni Sorption on Pyrophyllite: Evidence for the Formation of Ni-Al Hydroxide and Its Transformation. Ford, K. S. Scheckel Former EXAFS studies of the sorption of Co and Ni on Al-containing clay minerals

Sparks, Donald L.

14

Properties of spark-deposited Ni–Cr–NiAl coatings  

Science Journals Connector (OSTI)

The structure and phase composition of sintered Ni–Cr–NiAl alloys and the kinetics of their electrospark deposition onto 45 steel are examined. It is ... shown that the mass transfer coefficient for the deposition

A. V. Paustovskii; R. A. Alfintseva…

2009-07-01T23:59:59.000Z

15

Magnetism in Ni-Cu Alloys  

Science Journals Connector (OSTI)

On the assumption that in Ni-Cu alloys the spin moment on a Ni atom depends on the local atomic environment, it was possible to find moment values for the various atomic configurations so as to give average moments in reasonable quantitative agreement with the values measured in the ferromagnetic composition range. The local environment is specified by the number of Ni nearest neighbors and the number of Ni second-nearest neighbors. This model allows also a consistent qualitative interpretation of the effect on the average moment of low-temperature annealing treatment and of plastic deformation.

C. G. Robbins; Helmut Claus; Paul A. Beck

1969-06-16T23:59:59.000Z

16

Kinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation  

E-Print Network [OSTI]

Kinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation Zhenqing Shi, Lawrence, Kansas 66045-7609, United States *S Supporting Information ABSTRACT: The kinetics of Ni sorption) precipitates using both experimental studies and kinetic modeling. Batch sorption kinetic experiments were

Sparks, Donald L.

17

Bond formation at the Ni/ZrO2 interface  

Science Journals Connector (OSTI)

We report on the formation of strong chemical bonds at the Ni(100)/cubic-ZrO2(100) polar interfaces. Ab initio density functional theory calculations demonstrate that both Zr/Ni and O/Ni junctions are energetically stable, and predict that two different interactions determine the interface adhesion. Our results reveal that O-Ni ionic bonds are formed by Ni electron donation, while the Zr-Ni bonds show a mixed character with ionic and electron hybridization contributions.

J. I. Beltrán; S. Gallego; J. Cerdá; J. S. Moya; M. C. Muñoz

2003-08-07T23:59:59.000Z

18

Positron-annihilation measurements of vacancy formation in Ni and Ni(Ge)  

SciTech Connect (OSTI)

Vacancy formation in Ni and in dilute Ni(Ge) alloys was studied under thermal equilibrium conditions using positron-annihilation Doppler broadening. A monovacancy formation enthalpy of 1.8 +- 0.1 eV was determined for pure Ni; combining this result with that from previous tracer self-diffusion measurements, a monovacancy migration enthalpy of 1.1 +- 0.1 eV was also deduced. Analysis of the vacancy formation measurements in Ni(0.3 at.% Ge) and Ni(1 at.% Ge) yielded a value for the vacancy-Ge binding enthalpy of 0.20 +- 0.04 eV.

Smedskjaer, L.C.; Fluss, M.J.; Legnini, D.G.; Chason, M.K.; Siegel, R.W.

1982-03-01T23:59:59.000Z

19

Purification and Characterization of [NiFe]-Hydrogenase of Shewanella...  

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

Purification and Characterization of NiFe-Hydrogenase of Shewanella oneidensis MR-1. Purification and Characterization of NiFe-Hydrogenase of Shewanella oneidensis MR-1....

20

Land Use and natUraL resoUrces  

E-Print Network [OSTI]

.......................5 Public Real Estate Transactions it to someone starting out? I believe that, given our real need to find integrative solutions to complex or sustainable community design. Whether you are new to the profession or currently work as a developer, engineer

California at Davis, University of

Note: This page contains sample records for the topic "ura ni um" 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

LIRMM UM II Component based Software Architecture  

E-Print Network [OSTI]

1 LIRMM UM II Component based Software Architecture of Robot Controllers R. Passama, D. Andreu, C component approaches and robot control architectures. This methodology defines a process that guides architecture, useful for analysis and integration, and a dedicated component-based language, focusing

Paris-Sud XI, Université de

22

Ni{sub 3}Al aluminide alloys  

SciTech Connect (OSTI)

This paper provides a brief review of the recent progress in research and development of Ni{sub 3}Al and its alloys. Emphasis has been placed on understanding low ductility and brittle fracture of Ni{sub 3}Al alloys at ambient and elevated temperatures. Recent studies have resulted in identifying both intrinsic and extrinsic factors governing the fracture behavior of Ni{sub 3}Al alloys. Parallel efforts on alloy design using physical metallurgy principles have led to properties for structural use. Industrial interest in these alloys is high, and examples of industrial involvement in processing and utilization of these alloys are briefly mentioned.

Liu, C.T.

1993-10-01T23:59:59.000Z

23

Electroslag surfacing of steel shafting with Ni alloy 625 and 70Cu-30Ni strip  

SciTech Connect (OSTI)

A comprehensive study of electroslag surfacing (ESS) of steel with Ni Alloy 625 and 70Cu-30Ni strip electrodes was conducted to establish the feasibility of replacing forged bearing sleeves on propulsion shafting with integral weld surfacing. The base material was MIL-S-23284, Class 1 steel in the form of 41--66 cm (16--26 in.) diameter shafting and 76 mm (3 in.) thick flat plate. All ESS was carried out at a heat input level of approximately 5.9kJ/mm (150 kJ/in.) using 30 x 0.5 mm (1.2 x 0.02 in.) strip electrodes. Assessments of mechanical properties and microstructure of Ni Alloy 625 surfacing and 70Cu-30Ni surfacing were conducted to establish the structure-property relationships in these complex alloy systems. In addition, a solidification cracking test was developed to determine the relative cracking susceptibilities of these strip surfacing alloys. Although the Ni Alloy 625 surfacing contained small islands of interdendritic MC type carbides and Laves phase, the mechanical properties of this surfacing were satisfactory. The 70Cu-30Ni surfacing required a buttering layer of 30Cu-70Ni or pure Ni to prevent solidification cracking. The inherent ductility-dip sensitivity of 70Cu-30Ni surfacing was overcome by the development of a suitable ESS procedure.

Devletian, J.H.; Gao, Y.P.; Wood, W.E. [Oregon Graduate Inst. of Science and Technology, Portland, OR (United States)

1996-12-31T23:59:59.000Z

24

New Ni Amidinate Source for ALD/CVD of NiNx, NiO and NiSi , Thiloma Perera1  

E-Print Network [OSTI]

to be particularly important in memory as well as logic applications. Nickel silicide (NiSi) is emerging with a metal-insulator-metal (MIM) structure, offer potential applications for the next generation nonvolatile

25

Photosensitivity of the Ni-A state of [NiFe] hydrogenase from Desulfovibrio vulgaris Miyazaki F with visible light  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer Ni-A state of [NiFe] hydrogenase showed light sensitivity. Black-Right-Pointing-Pointer New FT-IR bands were observed with light irradiation of the Ni-A state. Black-Right-Pointing-Pointer EPR g-values of the Ni-A state shifted upon light irradiation. Black-Right-Pointing-Pointer The light-induced state converted back to the Ni-A state under the dark condition. -- Abstract: [NiFe] hydrogenase catalyzes reversible oxidation of molecular hydrogen. Its active site is constructed of a hetero dinuclear Ni-Fe complex, and the oxidation state of the Ni ion changes according to the redox state of the enzyme. We found that the Ni-A state (an inactive unready, oxidized state) of [NiFe] hydrogenase from Desulfovibrio vulgaris Miyazaki F (DvMF) is light sensitive and forms a new state (Ni-AL) with irradiation of visible light. The Fourier transform infrared (FT-IR) bands at 1956, 2084 and 2094 cm{sup -1} of the Ni-A state shifted to 1971, 2086 and 2098 cm{sup -1} in the Ni-AL state. The g-values of g{sub x} = 2.30, g{sub y} = 2.23 and g{sub z} = 2.01 for the signals in the electron paramagnetic resonance (EPR) spectrum of the Ni-A state at room temperature varied for -0.009, +0.012 and +0.010, respectively, upon light irradiation. The light-induced Ni-AL state converted back immediately to the Ni-A state under dark condition at room temperature. These results show that the coordination structure of the Fe site of the Ni-A state of [NiFe] hydrogenase is perturbed significantly by light irradiation with relatively small coordination change at the Ni site.

Osuka, Hisao [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan) [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan); Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan); Shomura, Yasuhito; Komori, Hirofumi; Shibata, Naoki [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan)] [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan); Nagao, Satoshi [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan)] [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan); Higuchi, Yoshiki, E-mail: hig@sci.u-hyogo.ac.jp [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan) [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan); CREST, JST, Gobancho, Chiyoda-ku, Tokyo 102-0076 (Japan); Hirota, Shun, E-mail: hirota@ms.naist.jp [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan) [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan); CREST, JST, Gobancho, Chiyoda-ku, Tokyo 102-0076 (Japan)

2013-01-04T23:59:59.000Z

26

Size effects in Ni/Ni(OH)2 nanomaterials for electrochemical capacitors.  

SciTech Connect (OSTI)

Electrochemical capacitors based on redox-active metal oxides show great promise for many energy-storage applications. These materials store charge through both electric double-layer charging and faradaic reactions in the oxide. The dimensions of the oxide nanomaterials have a strong influence on the performance of such capacitors. Not just due to surface area effects, which influence the double-layer capacitance, but also through bulk electrical and ionic conductivities. Ni(OH)2 is a prime candidate for such applications, due to low cost and high theoretical capacity. We have examined the relationship between diameter and capacity for Ni/Ni(OH)2 nanorods. Specific capacitances of up to 511 F/g of Ni were recorded in 47 nm diameter Ni(OH)2 nanorods.

Bunker, Bruce Conrad; Limmer, Steven J.; Yelton, William Graham

2010-04-01T23:59:59.000Z

27

Structure Analysis of a Precipitate Phase in an Ni-Rich High...  

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

Analysis of a Precipitate Phase in an Ni-Rich High Temperature NiTiHf Shape Memory Alloy. Structure Analysis of a Precipitate Phase in an Ni-Rich High Temperature NiTiHf Shape...

28

Airtricity Developments NI Ltd | Open Energy Information  

Open Energy Info (EERE)

NI Ltd NI Ltd Jump to: navigation, search Name Airtricity Developments NI Ltd Place Belfast, Northern Ireland, United Kingdom Zip BT2 7AF Sector Wind energy Product Focused on construction of wind farms in Northern Ireland. Coordinates 54.595295°, -5.934524° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":54.595295,"lon":-5.934524,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

29

Magnetic quantum diesel engine in Ni2  

Science Journals Connector (OSTI)

Quantum Diesel cycles are numerically realized using the electronic states of a Ni2 dimer. The quantum nature and the complexity of the electronic structure of the Ni2 dimer result in new features in the evolution of the pressure as well as in the heat-work transformation. The multitude of internal degrees of freedom in the isobaric process in molecules can result in crossing of the two adiabatic processes in the P-V diagram. The interplay of heat and work, originating from thermal nonequilibrium effects, can lead to a thermal efficiency of up to 100%. The spin moment of the Ni2 can be decreased by the isobaric process. To link the molecular heat capacity to easily accessible experimental quantities, we also calculate the Kerr effect and the magnetic susceptibility at different temperatures and magnetic fields.

C. D. Dong; G. Lefkidis; W. Hübner

2013-12-20T23:59:59.000Z

30

Energy absorption in Ni-Mn-Ga/ polymer composites  

E-Print Network [OSTI]

In recent years Ni-Mn-Ga has attracted considerable attention as a new kind of actuator material. Off-stoichiometric single crystals of Ni2MnGa can regularly exhibit 6% strain in tetragonal martensites and orthorhombic ...

Feuchtwanger, Jorge

2006-01-01T23:59:59.000Z

31

Carbon Nanotube Growth Using Ni Catalyst in Different Layouts  

E-Print Network [OSTI]

Vertically aligned carbon nanotubes have been grown using Ni as catalyst by plasma enhanced chemical vapor deposition system (PECVD) in various pre-patterned substrates. Ni was thermally evaporated on silicon substrates ...

Nguyen, H. Q.

32

Good and bad features of Ni-Cd cell designs  

SciTech Connect (OSTI)

Processes for spacecraft Ni-Cd cells are reviewed. Mechanical impregnation is compared against chemical and thermochemical impregnation.

Gross, S.

1996-02-01T23:59:59.000Z

33

Dampfdruckmessungen und Protonenresonanzuntersuchung an Hydriden der intermetallischen Phasen Ti2(Ni, Co) und Ti2(Ni, Fe)  

Science Journals Connector (OSTI)

NMR and hydrogen equilibrium pressure measurements were performed on hydrides of the intermetallic compounds Ti2(Ni, Co) and Ti2(Ni, Fe). The following values of enthalpy ?H and entropy ?S for the formation of th...

Engelbert Tuscher; Kurt Hiebl; Helmut Bittner

1981-02-01T23:59:59.000Z

34

CoNiGa High Temperature Shape Memory Alloys  

E-Print Network [OSTI]

commercially successful SMAs such as NiTi and Cu-based alloys. In recent years, the CoNiGa system has emerged as a new ferromagnetic shape memory alloy with some compositions exhibiting high martensitic transformation temperatures which makes CoNiGa a potential...

Dogan, Ebubekir

2011-10-21T23:59:59.000Z

35

High Temperature coatings based on {beta}-NiAI  

SciTech Connect (OSTI)

High temperature alloys are reviewed, focusing on current superalloys and their coatings. The synthesis, characerization, and oxidation performance of a NiAl–TiB{sub 2} composite are explained. A novel coating process for Mo–Ni–Al alloys for improved oxidation performance is examined. The cyclic oxidation performance of coated and uncoated Mo–Ni–Al alloys is discussed.

Severs, Kevin

2012-07-10T23:59:59.000Z

36

Usina do Trabalho do Ator: um teatro canibal  

E-Print Network [OSTI]

FALL 1999 97 Usina do Trabalho do Ator: um teatro canibal Gilberto lele O grupo Usina do Trabalho do Ator é um teatro-laboratório que vem trabalhando desde 1992, em Porto Alegre, estado do Rio Grande do Sul, no Brasil. O trabalho concentra... característico à arte produzida no Brasil. Somos um país gigantesco, descendemos de várias e ricas nações, possuímos manifestações culturais e folclóricas das mais diversas, talvez a aceitação desta diversidade seja nossa característica. Contudo...

Icle, Gilberto

1999-10-01T23:59:59.000Z

37

Desenvolvimento experimental de um motor stirling tipo gama.  

E-Print Network [OSTI]

??O presente trabalho consiste no desenvolvimento experimental de um motor Stirling tipo gama. São apresentadas inicialmente as diferentes configurações deste tipo de motor (alfa, gama… (more)

Vinicius Guimarães da Cruz

2012-01-01T23:59:59.000Z

38

Grain boundary compositon in NiAl  

SciTech Connect (OSTI)

The high temperature strength and oxidation resistance of many transition metal aluminides makes these intermetallic materials attractive for high temperature applications. However, these aluminides are generally brittle at low temperatures and this restricts their technological applications. However, these aluminides are generally brittle at low temperatures and this restricts their technological applications. It has been demonstrated that the addition of more than 200 ppm of boron to the L1{sub 2}-ordered Ni{sub 3}Al changes the fracture behavior from intergranular to transgranular and increases the ductility. The B2-ordered NiAl nickel aluminide is particularly attractive because of its low density and high melting temperature. This aluminide also fractures intergranularly at room temperature. However, no improvement in ductility is observed with similar boron additions even though the intergranular fracture is suppressed and there is a significant increase in the yield strength. In this paper, the results of an atom probe field ion microscopy investigation of the compositions of the grain boundaries in undoped and boron-doped NiAl are presented. The suitability of the atom probe field ion microscopy technique for the characterization of boundaries has clearly been demonstrated in many previous investigations including the characterization of boron segregation to grain boundaries and other planar features in Ni{sub 3}Al.

Miller, M.K.; Jayaram, R.; Camus, P.P. (Metals and Ceramics Div., Oak Ridge National Lab., Oak Ridge, TN (US))

1992-02-15T23:59:59.000Z

39

Geometric structures of thin film: Pt on Pd(110) and NiO on Ni(100)  

SciTech Connect (OSTI)

This thesis is divided into 3 papers: dynamical low-energy electron- diffraction investigation of lateral displacements in topmost layer of Pd(110); determination of (1{times}1) and (1{times}2) structures of Pt thin films on Pd(110) by dynamical low-energy electron-diffraction analysis; and structural determination of a NiO(111) film on Ni(100) by dynamical low-energy electron-diffraction analysis.

Warren, O.L.

1993-07-01T23:59:59.000Z

40

Ni-Pt Silicide Formation Through Ti Mediating Layers  

SciTech Connect (OSTI)

With Ni1-xPtxSi, the variation in queue time between the final surface cleaning and Ni-Pt deposition represents a significant manufacturability issue. A short queue time is often difficult to maintain, leading to the formation of an oxide layer on the Si substrate prior to Ni-Pt deposition that can affect the formation of Ni1-xPtxSi and its texture. In this manuscript, it will be shown that an extended queue time prior to Ni-Pt deposition leads to morphological changes in the Ni1-xPtxSi formation sequence. A layer of Ti deposited between Ni-Pt and Si reduces the native oxide and may facilitate Ni1-xPtxSi formation. With increasing Ti thickness, the presence of metal-rich phases is gradually reduced and the formation temperature of Ni1-xPtxSi increases, suggesting a direct formation of Ni1-xPtxSi from Ni-Pt. In the presence of an interfacial oxide, an increase in formation temperature is also observed with increasing Ti interlayer thickness. When the Ti layer is sufficiently thick, the phase formation sequence becomes relatively insensitive to the presence of an interfacial oxide or extended queue time.

Besser,P.; Lavoie, C.; Ozcan, A.; Murray, C.; Strane, J.; Wong, K.; Gribelyuk, M.; Wang, Y.; Parks, C.; Jordan-Sweet, J.

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

Comparison of Three Ni-Hard I Alloys  

Office of Scientific and Technical Information (OSTI)

Comparison of Three Ni-Hard I Alloys Comparison of Three Ni-Hard I Alloys Ö. N. Do-an 1 , J.A. Hawk 1 , and J.Rice 2 1 U.S. Department of Energy, Albany Research Center, Albany, Oregon 2 Texaloy Foundry Co., Inc., Floresville, Texas Keywords: Ni-Hard white irons, Bainite, Martensite, Austenite, Abrasion resistant iron Abstract This report documents the results of an investigation which was undertaken to reveal the similarities and differences in the mechanical properties and microstructural characteristics of three Ni-Hard I alloys. One alloy (B1) is ASTM A532 class IA Ni-Hard containing 4.2 wt. pct. Ni. The second alloy (B2) is similar to B1 but higher in Cr, Si, and Mo. The third alloy (T1) also falls in the same ASTM specification, but it contains 3.3 wt. pct. Ni. The alloys were evaluated in both as-cast and

42

SF 6432-NI (04-95)  

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

6/14/11 6/14/11 Page 1 of 14 Printed copies of this document are uncontrolled. Retrieve latest version electronically. SF 6432-NI (06/14/11) SECTION II STANDARD TERMS AND CONDITIONS FOR FIXED PRICE CONTRACTS WITH THE NEWLY INDEPENDENT STATES OF THE FORMER SOVIET UNION INDEX OF CLAUSES. THE FOLLOWING CLAUSES APPLY TO REQUESTS FOR QUOTATION AND CONTRACTS AS INDICATED UNLESS SPECIFICALLY DELETED, OR EXCEPT TO THE EXTENT THEY ARE SPECIFICALLY SUPPLEMENTED OR AMENDED IN WRITING IN THE SIGNATURE PAGE OR SECTION I. NI01 - ACCEPTANCE OF TERMS AND CONDITIONS Contractor, by signing this Agreement, beginning performance, and/or delivering Items or services ordered under this Agreement, agrees to comply with all the terms and conditions and all specifications and other documents that this Contract incorporated by

43

Microsoft Word - NiR.doc  

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

Side-on Cu-Nitrosyl Coordination by Nitrite Reductase Side-on Cu-Nitrosyl Coordination by Nitrite Reductase Elitza I. Tocheva and Michael E. P. Murphy Department of Microbiology & Immunology, The University of British Columbia, Vancouver, BC, Canada V6T 1Z3. Nitric oxide (NO) is one of the smallest and simplest biologically active molecules. In mammals, NO is produced from arginine by isoforms of nitric oxide synthase, and it func- tions in signal transduction and as a cytoprotective or cytotoxic agent. In bacteria, NO is produced by nitrite reductase (NiR), a copper-containing enzyme, which is responsible for the reduction of nitrite to nitric oxide (NO) in the process of dissimilatory denitrification. Cu- containing NiRs are homotrimers with two distinct Cu sites per monomeric unit (1). The type

44

NiW and NiRu Bimetallic Catalysts for Ethylene Steam Reforming: Alternative Mechanisms for Sulfur Resistance  

SciTech Connect (OSTI)

Previous investigations of Ni-based catalysts for the steam reforming of hydrocarbons have indicated that the addition of a second metal can reduce the effects of sulfur poisoning. Two systems that have previously shown promise for such applications, NiW and NiRu, are considered here for the steam reforming of ethylene, a key component of biomass derived tars. Monometallic and bimetallic Al{sub 2}O{sub 3}-supported Ni and W catalysts were employed for ethylene steam reforming in the presence and absence of sulfur. The NiW catalysts were less active than Ni in the absence of sulfur, but were more active in the presence of 50 ppm H{sub 2}S. The mechanism for the W-induced improvements in sulfur resistance appears to be different from that for Ru in NiRu. To probe reasons for the sulfur resistance of NiRu, the adsorption of S and C{sub 2}H{sub 4} on several bimetallic NiRu alloy surfaces ranging from 11 to 33 % Ru was studied using density functional theory (DFT). The DFT studies reveal that sulfur adsorption is generally favored on hollow sites containing Ru. Ethylene preferentially adsorbs atop the Ru atom in all the NiRu (111) alloys investigated. By comparing trends across the various bimetallic models considered, sulfur adsorption was observed to be correlated with the density of occupied states near the Fermi level while C{sub 2}H{sub 4} adsorption was correlated with the number of unoccupied states in the d-band. The diverging mechanisms for S and C{sub 2}H{sub 4} adsorption allow for bimetallic surfaces such as NiRu that enhance ethylene binding without accompanying increases in sulfur binding energy. In contrast, bimetallics such as NiSn and NiW appear to decrease the affinity of the surface for both the reagent and the poison.

Rangan, M.; Yung, M. M.; Medlin, J. W.

2012-06-01T23:59:59.000Z

45

Fusion of radioactive $^{132}$Sn with $^{64}$Ni  

E-Print Network [OSTI]

Evaporation residue and fission cross sections of radioactive $^{132}$Sn on $^{64}$Ni were measured near the Coulomb barrier. A large sub-barrier fusion enhancement was observed. Coupled-channel calculations including inelastic excitation of the projectile and target, and neutron transfer are in good agreement with the measured fusion excitation function. When the change in nuclear size and shift in barrier height are accounted for, there is no extra fusion enhancement in $^{132}$Sn+$^{64}$Ni with respect to stable Sn+$^{64}$Ni. A systematic comparison of evaporation residue cross sections for the fusion of even $^{112-124}$Sn and $^{132}$Sn with $^{64}$Ni is presented.

J. F. Liang; D. Shapira; J. R. Beene; C. J. Gross; R. L. Varner; A. Galindo-Uribarri; J. Gomez del Campo; P. A. Hausladen; P. E. Mueller; D. W. Stracener; H. Amro; J. J. Kolata; J. D. Bierman; A. L. Caraley; K. L. Jones; Y. Larochelle; W. Loveland; D. Peterson

2007-04-05T23:59:59.000Z

46

Computing Free Energy Landscapes: Application to Ni-based Electrocatal...  

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

Computing Free Energy Landscapes: Application to Ni-based Electrocatalysts with Pendant Amines for H2 Production and Oxidation. Computing Free Energy Landscapes: Application to...

47

ARTIGO INTERNET Um passo mais prximo das estrelas  

E-Print Network [OSTI]

semana, cientistas do Laboratório Lawrence Livermore , na Califórnia, dão conta de um avanço do mundo - o mega-projecto National Ignition Facility (NIF) - que foi inaugurado em Maio de 2009 e começa agora a dar os primeiros resultados de sucesso. O NIF, cuja construção se iniciou em 1997, tem um

Instituto de Sistemas e Robotica

48

Enhanced photocatalytic efficiency in zirconia buffered n-NiO/p-NiO single crystalline heterostructures by nanosecond laser treatment  

SciTech Connect (OSTI)

We report the formation of NiO based single crystalline p-n junctions with enhanced photocatalytic activity induced by pulsed laser irradiation. The NiO epilayers were grown on Si(001) substrates buffered with cubic yttria-stabilized zirconia (c-YSZ) by using pulsed laser deposition. The NiO/c-YSZ/Si heterostructures were subsequently laser treated by 5 pulses of KrF excimer laser (pulse duration = 25 Multiplication-Sign 10{sup -9} s) at lower energies. Microstructural studies, conducted by X-ray diffraction ({theta}-2{theta} and {phi} techniques) and high resolution transmission electron microscope, showed a cube-on-cube epitaxial relationship at the c-YSZ/Si interface; the epitaxial relationship across the NiO/c-YSZ interface was established as NiO<111 > Double-Vertical-Line Double-Vertical-Line c-YSZ<001> and in-plane NiO<110> Double-Vertical-Line Double-Vertical-Line c-YSZ<100>. Electron microscopy studies showed that the interface between the laser annealed and the pristine region as well as the NiO/c-YSZ interface was atomically sharp and crystallographically continuous. The formation of point defects, namely oxygen vacancies and NiO, due to the coupling of the laser photons with the NiO epilayers was confirmed by XPS. The p-type electrical characteristics of the pristine NiO epilayers turned to an n-type behavior and the electrical conductivity was increased by one order of magnitude after laser treatment. Photocatalytic activity of the pristine (p-NiO/c-YSZ/Si) and the laser-annealed (n-NiO/p-NiO/c-YSZ/Si) heterostructures were assessed by measuring the decomposition rate of 4-chlorophenol under UV light. The photocatalytic reaction rate constants were determined to be 0.0059 and 0.0092 min{sup -1} for the as-deposited and the laser-treated samples, respectively. The enhanced photocatalytic efficiency was attributed to the suppressed charge carrier recombination in the NiO based p-n junctions and higher electrical conductivity. Besides, the oxygen vacancies ease the adsorption of 4-chlorophenol, hydroxyl, and water molecules to the surface. Thus, n-NiO/p-NiO single crystalline catalysts can be introduced as a potent candidate to remediate the environmental pollution.

Molaei, R.; Bayati, M. R.; Alipour, H. M.; Nori, S.; Narayan, J. [Department of Materials Science and Engineering, NC State University, EB-1, Raleigh, North Carolina 27695-7907 (United States)] [Department of Materials Science and Engineering, NC State University, EB-1, Raleigh, North Carolina 27695-7907 (United States)

2013-06-21T23:59:59.000Z

49

Formation of a Novel Ordered Ni3Al Surface Structure by Codeposition on NiAl(110)  

SciTech Connect (OSTI)

The formation of a new type of ordered 2D Ni3Al overlayer by low-temperature codeposition on NiAl(110) is demonstrated by kinetic Monte Carlo simulation of a multisite atomistic lattice-gas model with a precise treatment of surface diffusion kinetics. Simultaneous codeposition with 3?1 Ni?Al yields poor ordering at 300 K but well-ordered structures by ?500??K. Sequential codeposition of Ni then Al yields unmixed core-ring nanostructures at 300 K but strong intermixing and ordering by ?500??K.

Han, Yong; Unal, Baris; Evans, James W.

2012-05-23T23:59:59.000Z

50

Paramagnetic neutron scattering from Ni (invited)  

Science Journals Connector (OSTI)

New polarized beammeasurements have been carried out in the paramagnetic phase of 6 0Ni in order to enlarge the (q ?) range previously studied by Steinsvoll e t a l. Magnetic scattering has been detected up to halfway to the zone boundary. The results can be successfully interpreted in terms of a diffusive?type scattering function over an unexpected wide (q ?) range qneutron data are also compared with the predictions of the very recent band model by Callaway. Finally we point out important similarities and differences in the paramagnetic scattering from localized systems such as EuO and itinerant systems and discuss the universality of the paramagnetic scattering function.

P. Böni; G. Shirane

1985-01-01T23:59:59.000Z

51

E-Print Network 3.0 - argentino um estudo Sample Search Results  

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

Nanocincia e Nanotecnologia: um bom motivo para a Cooperao Cientfica Brasil-Argentina Oswaldo Luiz Alves... dimetro de um fio de cabelo, ou, ainda, 10-9 do...

52

UM BONDE CHAMADO AFETO: DESCREVENDO AS CONEXÕES NUMA CASA DE PROSTITUIÇÃO FEMININA.  

E-Print Network [OSTI]

??O presente trabalho é um estudo etnográfico das conexões de afeto e reciprocidade desenvolvidas por pessoas que moram e/ou trabalham em um ambiente de prostituição… (more)

Amanda Gomes Pereira

2010-01-01T23:59:59.000Z

53

E-Print Network 3.0 - alto rendimento um Sample Search Results  

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

econmico socialista Summary: desde o princpio dos anos 20 at a dcada de 1970. Neste curto livro 1 , Brian Pollitt reuniu um... um marxista ocidental erudito quando...

54

Effect of Pd on the Ni{sub 2}Si stress relaxation during the Ni-silicide formation at low temperature  

SciTech Connect (OSTI)

The thermally induced solid-state reaction between a 50-nm-thick Ni(6%Pd) layer and a Si(100) substrate was investigated using in situ and simultaneous x-ray diffraction and sheet resistance. The reaction begins with the growth of the stressed {delta}-Ni{sub 2}Si phase, and the transient {theta}-Ni{sub 2}Si. At the end of the {theta}-Ni{sub 2}Si consumption, a NiSi seed is formed. Then, the {delta}-Ni{sub 2}Si relaxation occurs simultaneously with its subsequent growth and the Pd out diffusion from the unreacted Ni(Pd) layer. It is suggested that the driving force for the Pd diffusion out of the metal layer is linked to both the higher solubility of Pd in NiSi compared to Ni{sub 2}Si and to the Ni{sub 2}Si relaxation.

Putero, M.; Mangelinck, D. [Aix-Marseille Univ., IM2NP, Faculte des Sciences de Jerome, F-13397 Marseille (France); CNRS, IM2NP-UMR 7334, Faculte des Sciences de Jerome, F-13397 Marseille (France)

2012-09-10T23:59:59.000Z

55

E-Print Network 3.0 - al-ni-co decagonal quasicrystal Sample...  

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

Summary: of decagonal Al-Ni-Co K. Pussi Department of Electrical Engineering, Lappeenranta University of Technology, P... . EARLIER WORK ON d-Al-Ni-Co STRUCTURES Decagonal...

56

''Bare'' single-particle energies in Ni-56  

E-Print Network [OSTI]

The structure of the low-lying levels in the mirror nuclei Ni-57 and Cu-57 is described within the extended unified model. The problem of single-particle energies in Ni-56 is treated in detail. ''Bare'' single-particle energies are extracted from...

Trache, L.; Kolomiets, A.; Shlomo, S.; Heyde, K.; Dejbakhsh, H.; Gagliardi, Carl A.; Tribble, Robert E.; Zhou, XG; Jacob, VE; Oros, AM.

1996-01-01T23:59:59.000Z

57

Lanthanide Al-Ni base Ericsson cycle magnetic refrigerants  

DOE Patents [OSTI]

A magnetic refrigerant for a magnetic refrigerator using the Ericsson thermodynamic cycle comprises DyAlNi and (Gd{sub 0.54}Er{sub 0.46})AlNi alloys having a relatively constant {Delta}Tmc over a wide temperature range. 16 figs.

Gschneidner, K.A. Jr.; Takeya, Hiroyuki

1995-10-31T23:59:59.000Z

58

Lanthanide Al-Ni base Ericsson cycle magnetic refrigerants  

DOE Patents [OSTI]

A magnetic refrigerant for a magnetic refrigerator using the Ericsson thermodynamic cycle comprises DyAlNi and (Gd.sub.0.54 Er.sub.0.46)AlNi alloys having a relatively constant .DELTA.Tmc over a wide temperature range.

Gschneidner, Jr., Karl A. (Ames, IA); Takeya, Hiroyuki (Ibaraki, JP)

1995-10-31T23:59:59.000Z

59

Phase relations in the system Ni-As  

Science Journals Connector (OSTI)

...n' ' , / / I , 852(N_i,As)+VN',Asz+L+V ima+L+v/IpnncC;rVrlrl+V(NiAs)+NisAsz+V-, , I I// INIs.xAs +mama+ncll Ni,_xAS,+V/i +V +VJ[ Inc+prm+V , , , , , , , .i,, .! , . I0 20 30 40 50 60 70 Weight per...

R. A. Yund

60

Low temperature epitaxial growth of Ge on cube- textured Ni  

SciTech Connect (OSTI)

Quasi- single crystal Ge films were grown on [001]<010> textured Ni substrate at a temperature of 350 oC using an insulating buffer layer of CaF2. A direct deposition of Ge on Ni at 350 oC was shown to alloy with Ni. From x- ray pole figure analysis, it was shown that Ge grew epitaxially with the same orientation as CaF2 and the dispersions in the out- of- plane and in- plane directions were found to be 1.7 0.1o and 6 1o, respectively. In the out- of- plane direction, Ge[111]||CaF2[111]||Ni[001]. In addition, the Ge consisted of four equivalent in- plane oriented domains such that two mutually orthogonal directions: Ge 211 and Ge 011 are parallel to mutually orthogonal directions: Ni 110 and Ni 110 , respectively of the Ni(001) surface. This was shown to be originated from the four equivalent in- plane oriented domains of CaF2 created to minimize the mismatch strain between CaF2 and Ni in those directions.

GIARE, C [Rensselaer Polytechnic Institute (RPI); Palazzo, J [Rensselaer Polytechnic Institute (RPI); Goyal, Amit [ORNL; WANG, G [Rensselaer Polytechnic Institute (RPI); LU, T [Rensselaer Polytechnic Institute (RPI)

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

Autocatalytic decomposition of water on Ni(110)  

SciTech Connect (OSTI)

The interaction of water with clean Ni(110) at temperatures between 425 and 770 K has been studied by work function ([Delta][phi]), desorption mass analysis, and low-energy electron diffraction (LEED). Water is observed to dissociate on clean Ni(110), forming adsorbed oxygen and H[sub 2](g) in a process which is itself catalyzed (and hence termed autocatalytic) by the adsorbed oxygen product. Initial dissociation of water is believed to originate on defects where adsorbed oxygen then promotes growth of O (2 [times] 1) islands in a process which becomes self-poisoning in the limit of saturation of the (2 [times] 1) phase (0.5 ML (ML = monolayer)). The growth kinetics indicate the autocatalysis process is most active when the oxygen coverage is 0.1 ML. A statistical theory supported by computer simulation is developed which models the autocatalytic growth kinetics in terms of nucleation of islands along step edges. The temperature dependence of autocatalysis exhibits a maximum at approx. 600 K. This complex temperature dependence is explained in terms of transition-state theory. 25 refs., 10 figs.

Callen, B.W.; Griffiths, K.; Norton, P.R. (Univ. of Western Ontario, London (Canada)); Harrington, D.A. (Univ. of Victoria, British Columbia (Canada))

1992-12-24T23:59:59.000Z

62

Formation of a Novel Ordered Ni3Al Surface Structure by Codeposition on NiAl(110)  

E-Print Network [OSTI]

The formation of a new type of ordered 2D Ni3Al overlayer by low-temperature codeposition on NiAl(110) is demonstrated by kinetic Monte Carlo simulation of a multisite atomistic lattice-gas model with a precise treatment ...

Han, Yong

63

Evaluation of electron capture reaction rates in Ni isotopes in stellar environments  

SciTech Connect (OSTI)

Electron capture rates in Ni isotopes are studied in stellar environments, that is, at high densities and high temperatures during the core-collapse and postbounce explosive nucleosynthesis in supernovae. Reaction rates in {sup 58}Ni and {sup 60}Ni, as well as in {sup 56}Ni, {sup 62}Ni, and {sup 64}Ni, are evaluated by shell-model calculations with the use of a new shell-model Hamiltonian in the fp shell, GXPF1J. While the previous shell-model calculations failed to reproduce the measured peaks of Gamow-Teller strength in {sup 58}Ni and {sup 60}Ni, the present new Hamiltonian is found to reproduce them very well, as well as the capture rates obtained from the observed strengths. Strengths and energies of the Gamow-Teller transitions in {sup 56}Ni, {sup 62}Ni, and {sup 64}Ni are also found to be consistent with the observations.

Suzuki, Toshio [Department of Physics and Graduate School of Integrated Basic Sciences, College of Humanities and Sciences, Nihon University Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550 (Japan); Center for Nuclear Study, University of Tokyo, Hirosawa, Wako-shi, Saitama 351-0198 (Japan); National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan); Honma, Michio [Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580 (Japan); Mao, Helene [ENSPS, Pole API-Parc d'Innovation, Boulevard Sebastien Brant, BP 10413, F-67412 Illkirch Cedex (France); Otsuka, Takaharu [Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States); Kajino, Toshitaka [National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan); Deaprtment of Astronomy, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033 (Japan)

2011-04-15T23:59:59.000Z

64

Phase equilibria, formation, crystal and electronic structure of ternary compounds in Ti-Ni-Sn and Ti-Ni-Sb ternary systems  

SciTech Connect (OSTI)

The phase equilibria of the Ti-Ni-Sn and Ti-Ni-Sb ternary systems have been studied in the whole concentration range by means of X-ray and EPM analyses at 1073 K and 873 K, respectively. Four ternary intermetallic compounds TiNiSn (MgAgAs-type), TiNi{sub 2-x}Sn (MnCu{sub 2}Al-type), Ti{sub 2}Ni{sub 2}Sn (U{sub 2}Pt{sub 2}Sn-type), and Ti{sub 5}NiSn{sub 3} (Hf{sub 5}CuSn{sub 3}-type) are formed in Ti-Ni-Sn system at 1073 K. The TiNi{sub 2}Sn stannide is characterized by homogeneity in the range of 50-47 at% of Ni. The Ti-Ni-Sb ternary system at 873 K is characterized by formation of three ternary intermetallic compounds, Ti{sub 0.8}NiSb (MgAgAs-type), Ti{sub 5}Ni{sub 0.45}Sb{sub 2.55} (W{sub 5}Si{sub 3}-type), and Ti{sub 5}NiSb{sub 3} (Hf{sub 5}CuSn{sub 3}-type). The solubility of Ni in Ti{sub 0.8}NiSb decreases number of vacancies in Ti site up to Ti{sub 0.91}Ni{sub 1.1}Sb composition. - Graphical abstract: Isothermal section of the Ti-Ni-Sn phase diagram and DOS distribution in hypothetical TiNi{sub 1+x}Sn solid solution. Highlights: Black-Right-Pointing-Pointer Ti-Ni-Sn phase diagram was constructed at 1073 K. Black-Right-Pointing-Pointer Four ternary compounds are formed: TiNiSn, TiNi{sub 2-x}Sn, Ti{sub 2}Ni{sub 2}Sn, and Ti{sub 5}NiSn{sub 3}. Black-Right-Pointing-Pointer Three ternary compounds exist in Ti-Ni-Sb system at 873 K. Black-Right-Pointing-Pointer The TiNi{sub 2}Sb compound is absent.

Romaka, V.V., E-mail: romakav@yahoo.com [Department of Materials Engineering and Applied Physics, Lviv Polytechnic National University, Ustyyanovycha Str. 5, 79013 Lviv (Ukraine); Rogl, P. [Institut fur Physikalische Chemie der Universitat Wien, Wahringerstrabe 42, A-1090 Wien (Austria); Romaka, L.; Stadnyk, Yu. [Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryla and Mefodiya Str. 6, 79005 Lviv (Ukraine); Melnychenko, N.; Grytsiv, A.; Falmbigl, M. [Institut fur Physikalische Chemie der Universitat Wien, Wahringerstrabe 42, A-1090 Wien (Austria); Skryabina, N. [Perm State University, Bukireva Str. 15, 614990 Perm (Russian Federation)

2013-01-15T23:59:59.000Z

65

Geometric and Electronic Structures of the Ni(I) and Methyl-Ni(III)  

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

9 9 Geometric and Electronic Structures of the Ni(I) and Methyl-Ni(III) Intermediates of Methyl-Coenzyme M Reductase Methyl-coenzyme M reductase (MCR) from methanogenic archaea catalyzes the terminal step in biological methane synthesis. Using coenzyme B (CoBSH) as the two-electron donor, MCR reduces methyl-coenzyme M (methyl-SCoM) to form methane and the heterodisulfide product, CoBS-SCoM. MCR contains an essential redox active nickel tetrapyrrolic cofactor called coenzyme F430 at its active site, which is active in the reduced Ni(I) state (MCRred1). All of the biologically generated methane, amounting to 1 billion tons per annum globally, is formed by MCR. Furthermore, recent evidence indicates that anaerobic methane oxidation is also catalyzed by MCR and occurs by a reversal of the methane synthesis reaction. Methane is a potent greenhouse gas, trapping 20 times more heat than CO2. In addition, methane is also an important and clean fuel as it produced the least amount of CO2 per unit of heat released. Thus, it is critically important to understand the mechanism of formation of the smallest hydrocarbon in nature.

66

Graphene Monolayer Rotation on Ni(111) Facilities Bilayer Graphene Growth  

SciTech Connect (OSTI)

Synthesis of bilayer graphene by chemical vapor deposition is of importance for graphene-based field effect devices. Here, we demonstrate that bilayer graphene preferentially grows by carbon-segregation under graphene sheets that are rotated relative to a Ni(111) substrate. Rotated graphene monolayer films can be synthesized at growth temperatures above 650 C on a Ni(111) thin-film. The segregated second graphene layer is in registry with the Ni(111) substrate and this suppresses further C-segregation, effectively self-limiting graphene formation to two layers.

Batzill M.; Sutter P.; Dahal, A.; Addou, R.

2012-06-11T23:59:59.000Z

67

On the road to doubly-magic {sup 48}Ni  

SciTech Connect (OSTI)

A relativistic primary beam of {sup 58}Ni from the SIS synchrotron at GSI was used to produce proton-rich isotopes in the titanium-to-nickel region by projectile fragmention at the FRS. We report here on the first observation of the T{sub z}=-7/2 nuclei {sup 45}Fe and {sup 49}Ni. In addition, the new isotope {sup 42}Cr (T{sub z}=-3) was identified. This opens the route to the yet unobserved doubly-magic nucleus {sup 48}Ni.

Blank, B.; Czajkowski, S.; Davi, F.; Del Moral, R.; Dufour, J. P.; Fleury, A.; Marchand, C.; Pravikoff, M. S. [Centre d'Etudes Nucleaires de Bordeaux-Gradignan, F-33175 Gradignan Cedex (France); Benlliure, J.; Boue, F.; Collatz, R.; Heinz, A.; Hellstroem, M.; Hu, Z.; Roeckl, E.; Shibata, M.; Suemmerer, K. [Gesellschaft fuer Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt (Germany); Lewitowicz, M. [Grand Accelerateur National des Ions Lourds, B.P. 5027, F-14021 Caen Cedex (France); Janas, Z.; Karny, M. [Institute of Experimental Physics, University of Warsaw, PL-00-681 Warsaw, Hoza 69 (Poland)] (and others)

1998-12-21T23:59:59.000Z

68

Middle distillate hydrotreatment zeolite catalysts containing Pt/Pd or Ni  

E-Print Network [OSTI]

A study on middle distillate hydrotreatment zeolite catalysts containing Pt/Pd and/or Ni was performed. The effect of the addition of the corresponding CoMo, CoMoPd, CoMoPtPd and CoMoNi in PdNiPt-zeolite, Pt-zeolite, Ni-zeolite, and Pd...

Marin-Rosas, Celia

2009-05-15T23:59:59.000Z

69

Ni(NiO)/single-walled carbon nanotubes composite: Synthesis of electro-deposition, gas sensing property for NO gas and density functional theory calculation  

SciTech Connect (OSTI)

Graphical abstract: The Ni(NiO)/semiconducting single-walled carbon nanotubes composite collected from the cathode after electro-deposition shows a high sensitivity to low-concentration NO gas at room temperature (18 °C). Display Omitted Highlights: ? Ni(NiO) nanoparticles were deposited on semiconducting SWCNTs by electro-deposition. ? Ni(NiO)/semiconducting SWCNTs film shows a high sensitivity to NO gas at 18 °C. ?Theoretical calculation reveals electron transfer from SWCNTs to NO via Ni. -- Abstract: Single-walled carbon nanotubes which contains metallic SWCNTs (m-SWCNTs) and semiconducting SWCNTs (s-SWCNTs) have been obtained under electric arc discharge. Their separation can be effectively achieved by the electro-deposition method. The Ni(NiO)/s-SWCNTs composite was found on cathode where Ni was partially oxidized to NiO at ambient condition with Ni(NiO) nanoparticles deposited uniformly on the bundles of SWCNTs. These results were confirmed by Raman spectra, transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV–vis–NIR and TG characterizations. Furthermore, investigation of the gas sensing property of Ni(NiO)/s-SWCNTs composite film to NO gas at 18 °C demonstrated the sensitivity was approximately 5% at the concentration of 97 ppb. Moreover, density functional theory (DFT) calculations were performed to explore the sensing mechanism which suggested the adsorption of NO molecules onto the composite through N–Ni interaction as well as the proposition of electron transfer mechanisms from SWCNTs to NO via the Ni medium.

Li, Li; Zhang, Guo; Chen, Lei [Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion, College of Heilongjiang Province, Heilongjiang University, Harbin 150080 (China)] [Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion, College of Heilongjiang Province, Heilongjiang University, Harbin 150080 (China); Bi, Hong-Mei [Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080 (China)] [Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080 (China); Shi, Ke-Ying, E-mail: shikeying2008@yahoo.cn [Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080 (China)] [Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080 (China)

2013-02-15T23:59:59.000Z

70

The stellar (n,gamma) cross section of 62Ni  

E-Print Network [OSTI]

The 62Ni(n,gamma)63Ni(t_1/2=100+-2 yrs) reaction plays an important role in the control of the flow path of the slow neutron-capture (s-) nucleosynthesis process. We have measured for the first time the total cross section of this reaction for a quasi-Maxwellian (kT = 25 keV) neutron flux. The measurement was performed by fast-neutron activation, combined with accelerator mass spectrometry to detect directly the 63Ni product nuclei. The experimental value of 28.4+-2.8 mb, fairly consistent with a recent theoretical estimate, affects the calculated net yield of 62Ni itself and the whole distribution of nuclei with 62

71

Transverse acoustic actuation of Ni-Mn-Ga single crystals  

E-Print Network [OSTI]

Two methods for the transverse acoustic actuation of {110}-cut Ni-Mn-Ga single crystals are discussed. In this actuation mode, crystals are used that have the {110}- type twinning planes parallel to the base of the crystal. ...

Simon, Jesse Matthew

2007-01-01T23:59:59.000Z

72

Fr skulares Gleichgewicht gilt: bzw. Ai = iNi  

E-Print Network [OSTI]

Potts 1987 #12;Für säkulares Gleichgewicht gilt: 1N1 = 2N2 A1 = A2 bzw. Ai = iNi z. B. (230Th/238U

Siebel, Wolfgang

73

Thermal behavior simulation of Ni/MH battery  

Science Journals Connector (OSTI)

Thermal behavior of overcharged Ni/MH battery is studied with microcalorimeter. The battery is installed in a special device in ... Quantity of heat and heat capacity of the battery charged at different state of ...

DaHe Li; Kai Yang; Shi Chen; Feng Wu

2009-05-01T23:59:59.000Z

74

Electrodeposition of amorphous matrix Ni-W/Wp̳ composites  

E-Print Network [OSTI]

An amorphous Ni-W alloy matrix was incorporated with W particulate through two types of electrodeposition. The plating bath for the electrodeposition contained nickel sulfate, sodium tungstate, sodium citrate, ammonium ...

Jenket, Donald R. (Donald Robert)

2005-01-01T23:59:59.000Z

75

High-temperature phase stability and tribological properties of laser clad Mo{sub 2}Ni{sub 3}Si/NiSi metal silicide coatings  

SciTech Connect (OSTI)

Mo{sub 2}Ni{sub 3}Si/NiSi wear-resistant metal silicide composite coatings consisting of Mo{sub 2}Ni{sub 3}Si primary dendrite and interdendritic Mo{sub 2}Ni{sub 3}Si/NiSi eutectic were fabricated on substrate of an austenitic stainless steel AISI321 by laser cladding using Ni-Mo-Si elemental powder blends. The high-temperature structural stability of the coating was evaluated by aging at 800 deg. C for 1-50 h. High-temperature sliding wear resistance of the as-laser clad and aged coatings was evaluated at 600 deg. C. Results indicate that the Mo{sub 2}Ni{sub 3}Si/NiSi metal silicides coating has excellent high temperature phase stability. No phase transformation except the dissolution of the eutectic Mo{sub 2}Ni{sub 3}Si and the corresponding growth of the Mo{sub 2}Ni{sub 3}Si primary dendrite and no elemental diffusion from the coating into the substrate were detected after aging the coating at 800 deg. C for 50 h. Aging of the coating at 800 deg. C leads to gradual dissolution of the interdendritic eutectic Mo{sub 2}Ni{sub 3}Si and subsequent formation of a dual-phase structure with equiaxed Mo{sub 2}Ni{sub 3}Si primary grains distributed in the NiSi single-phase matrix. Because of the strong covalent-dominated atomic bonds and high volume fraction of the ternary metal silicide Mo{sub 2}Ni{sub 3}Si, both the original and the aged Mo{sub 2}Ni{sub 3}Si/NiSi coating has excellent wear resistance under pin-on-disc high-temperature sliding wear test conditions, although hardness of the aged coating is slightly lower than that of the as-clad coating.

Lu, X.D. [Laboratory of Laser Materials Processing and Surface Engineering, School of Materials Science and Engineering, Beihang University (China); Wang, H.M. [Laboratory of Laser Materials Processing and Surface Engineering, School of Materials Science and Engineering, Beihang University (China)]. E-mail: wanghuaming@263.net

2004-10-18T23:59:59.000Z

76

Shape memory behavior of ultrafine grained NiTi and TiNiPd shape memory alloys  

E-Print Network [OSTI]

The cyclic instability in shape memory characteristics of NiTi-based shape memory alloys (SMAs), such as transformation temperatures, transformation and irrecoverable strains and transformation hysteresis upon thermal and mechanical cycling limits...

Kockar, Benat

2009-05-15T23:59:59.000Z

77

The wetting behavior of NiAl and NiPtAl on polycrystalline alumina  

SciTech Connect (OSTI)

In order to understand the beneficial effect of Pt on the adherence of thermally grown alumina scales, sessile drop experiments were performed to study the wetting of poly-crystalline alumina by nickel-aluminum alloys with or without platinum addition where the amount of Pt ranged from 2.4 to 10 at.%. Subsequent interfacial structure was evaluated using atomic force microscopy. Platinum addition enhances the wettability of NiAl alloys on alumina, reduces the oxide/alloy interface energy and increases the interfacial mass transport rates.

Saiz, Eduardo; Gauffier, Antoine; Saiz, Eduardo; Tomsia, Antoni P.; Hou, Peggy Y.

2007-07-01T23:59:59.000Z

78

Electronic structure mechanism of spin-polarized electron transport in a NiC60Ni system  

E-Print Network [OSTI]

between Ni leads. The tunnel current has a much higher magnitude when Ni is bonded to hole sites (H6, H5) than at bridge sites (B66, B56) of the fullerene cage. Furthermore, the magnitude of junction. For example, the B66 site is the bridge site over a C@C double bond, the B56 site is the bridge site over a C

Pandey, Ravi

79

Sol-gel-derived NiO/NiAl{sub 2}O{sub 4} oxygen carriers for chemical-looping combustion by coal char  

SciTech Connect (OSTI)

This paper focuses on the investigation of Ni-based oxygen carriers for CLC by coal char. First, Al(OC{sub 3}H{sub 7}){sub 3} and Ni(NO{sub 3}){sub 2} are selected as the main raw materials to prepare sol-gel-derived NiO/NiAl{sub 2}O{sub 4} oxygen carriers. The oxygen carrier with a mass content of 60% NiO, a sintering temperature of 1300{sup o}C, and a sintering time of 6 h performs comparatively well. Second, the reduction reaction of the NiO/NiAl{sub 2}O{sub 4} oxygen carriers with char and the circular reduction/oxidation reactions of the NiO/NiAl{sub 2}O{sub 4} oxygen carriers with char/air or hydrogen/air are carried out in a thermogravimetric analysis (TGA) instrument to investigate the reactivities and chemical life of the prepared NiO/NiAl{sub 2}O{sub 4} oxygen carriers. The experimental results show that (a) when the TGA temperature is higher than 850{sup o}C, NiO/NiAl{sub 2}O{sub 4} starts to react with coal char rapidly, which indicates that CLC of coal char using NiO/NiAl{sub 2}O{sub 4} as oxygen carriers is a feasible technology of energy utilization in principle; (b) NiO/NiAl{sub 2}O{sub 4}, which maintains its activity over single-cycle reduction/oxidation reactions with char/air or multiple-cycle reduction/oxidation reactions with hydrogen/air, exhibits extremely good recyclablity; (c) the porous beehive structure of the NiO/NiAl{sub 2}O{sub 4} particle is maintained, and the sintering behavior between different particles is not observed during cyclic studies. Those experimental results prove the sol-gel-derived oxygen carrier NiO/NiAl{sub 2}O{sub 4} is capable of being used in chemical-looping combustion fueled by coal char or H{sub 2}. 51 refs., 5 figs., 5 tabs.

Haibo Zhao; Liming Liu; Baowen Wang; Di Xu; Linlin Jiang; Chuguang Zheng [Huazhong University of Science and Technology, Wuhan (China). State Key Laboratory of Coal Combustion

2008-03-15T23:59:59.000Z

80

UM Computer Science 2014-2015 Parent/Guardian Consent & Contact Form  

E-Print Network [OSTI]

UM Computer Science 2014-2015 Parent/Guardian Consent & Contact Form Print Child's Name: __________ I/we give our son/daughter permission to participate in the UM Computer Science workshop to the provision of any necessary emergency treatment to my son/daughter during the program by UM Computer Science

Chu, Xi

Note: This page contains sample records for the topic "ura ni um" 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

Modified Ni-Cu catalysts for ethanol steam reforming  

SciTech Connect (OSTI)

Three Ni-Cu catalysts, having different Cu content, supported on ?-alumina were synthesized by wet co-impregnation method, characterized and tested in the ethanol steam reforming (ESR) reaction. The catalysts were characterized for determination of: total surface area and porosity (N{sub 2} adsorption - desorption using BET and Dollimer Heal methods), Ni surface area (hydrogen chemisorption), crystallinity and Ni crystallites size (X-Ray Diffraction), type of catalytic active centers (Hydrogen Temperature Programmed Reduction). Total surface area and Ni crystallites size are not significantly influenced by the addition of Cu, while Ni surface area is drastically diminished by increasing of Cu concentration. Steam reforming experiments were performed at atmospheric pressure, temperature range 150-350°C, and ethanol - water molar ration of 1 at 30, using Ar as carrier gas. Ethanol conversion and hydrogen production increase by the addition of Cu. At 350°C there is a direct connection between hydrogen production and Cu concentration. Catalysts deactivation in 24h time on stream was studied by Transmission Electron Microscopy (TEM) and temperature-programmed reduction (TPR) on used catalysts. Coke deposition was observed at all studied temperatures; at 150°C amorphous carbon was evidenced, while at 350°C crystalline, filamentous carbon is formed.

Dan, M.; Mihet, M.; Almasan, V.; Borodi, G. [National Institute for Research and Development of Isotopic and Molecular Technologies, 65-103 Donath Street, 400293, Cluj-Napoca (Romania)] [National Institute for Research and Development of Isotopic and Molecular Technologies, 65-103 Donath Street, 400293, Cluj-Napoca (Romania); Katona, G.; Muresan, L. [Univ. Babes Bolyai, Fac. Chem. and Chem. Eng.,11 Arany Janos, 400028, Cluj-Napoca (Romania)] [Univ. Babes Bolyai, Fac. Chem. and Chem. Eng.,11 Arany Janos, 400028, Cluj-Napoca (Romania); Lazar, M. D., E-mail: diana.lazar@itim-cj.ro [65-103 Donath Street (Romania)

2013-11-13T23:59:59.000Z

82

Bimetallic Fe-Ni Oxygen Carriers for Chemical Looping Combustion  

SciTech Connect (OSTI)

The relative abundance, low cost, and low toxicity of iron make Fe-based oxygen carriers of great interest for chemical looping combustion (CLC), an emerging technology for clean and efficient combustion of fossil and renewable fuels. However, Fe also shows much lower reactivity than other metals (such as Ni and Cu). Here, we demonstrate strong improvement of Fe-based carriers by alloying the metal phase with Ni. Through a combination of carrier synthesis and characterization with thermogravimetric and fixed-bed reactor studies, we demonstrate that the addition of Ni results in a significant enhancement in activity as well as an increase in selectivity for total oxidation. Furthermore, comparing alumina and ceria as support materials highlights the fact that reducible supports can result in a strong increase in oxygen carrier utilization.

Bhavsar, Saurabh; Veser, Goetz

2013-11-06T23:59:59.000Z

83

Superconductivity in SrNi2P2 single crystals  

SciTech Connect (OSTI)

Heat capacity, magnetic susceptibility, and resistivity of SrNi{sub 2}P{sub 2} single crystals are presented, illustrating the structural transition at 325 K, and bulk superconductivity at 1.4 K. The magnitude of {Tc}, fits to the heat capacity data, the small upper critical field H{sub c2} = 390 Oe, and {kappa} = 2.1 suggests a conventional fully gapped superconductor. With applied pressure we find that superconductivity persists into the so-called 'collapsed tetragonal' phase, although the transition temperature is monotonically suppressed with increasing pressure. This argues that reduced dimensionality can be a mechanism for increasing the transition temperatures of layered NiP, as well as layered FeAs and NiAs, superconductors.

Ronning, Filip [Los Alamos National Laboratory; Bauer, Eric D [Los Alamos National Laboratory; Park, Tuscon [Los Alamos National Laboratory; Thompson, Joe D [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

84

Effect of nickel loading on the activity of Ni/ZrO2 for methane steam reforming at low temperature  

Science Journals Connector (OSTI)

The effect of Ni loading on the catalytic activity of Ni/ZrO2 catalyst for methane steam reforming was investigated. The sample containing 15 wt...

Long Q. Nguyen; Leonila C. Abella…

2008-04-01T23:59:59.000Z

85

Effect of Aging Heat Treatments on Ni52Ti48 Shape Memory Alloy  

E-Print Network [OSTI]

Ni-rich NiTi shape memory alloys (SMAs) are capable of attaining a wide range of transformation temperatures depending on the heat treatment conditions and superior thermo-mechanical cycling stability, which are desired for repeated solid...

Akin, Erhan

2011-10-21T23:59:59.000Z

86

SciTech Connect: Neutron Scattering of CeNi at the SNS-ORNL:...  

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

Conference: Neutron Scattering of CeNi at the SNS-ORNL: A Preliminary Report Citation Details In-Document Search Title: Neutron Scattering of CeNi at the SNS-ORNL: A Preliminary...

87

Textural Characterization of Pilc Montmorillonite Pillared with Binary Oxides LaNiOx  

Science Journals Connector (OSTI)

Montmorillonite pillared clay was synthesized by intercalation of binuclear complex of the form NiLa(fsaen)NO3 and subsequent calcination at 500°C. The binary oxides of the form NiLaOx thus created inside the lay...

S. P. Skaribas; P. J. Pomonis; P. Grange…

1993-01-01T23:59:59.000Z

88

E-Print Network 3.0 - alloy fracture cu-ni Sample Search Results  

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

fracture cu-ni Search Powered by Explorit Topic List Advanced Search Sample search results for: alloy fracture cu-ni Page: << < 1 2 3 4 5 > >> 1 Ris-R-1276(EN) Final Report...

89

X-ray absorption spectroscopy at the Ni-K edge in Stackhousia tryonii Bailey hyperaccumulator  

E-Print Network [OSTI]

X-ray absorption spectroscopy at the Ni–K edge inin vivo by micro x-ray absorption spectroscopy (XAS) at theNi–K edge. Both x-ray absorption near edge structure and

Kachenko, A.

2009-01-01T23:59:59.000Z

90

Piezospectroscopic study of substitutional Ni in ZnO  

SciTech Connect (OSTI)

The effect of uniaxial stress on the electronic {sup 3}T{sub 1}(F)?{sup 3}T{sub 2}(F) transitions of Ni{sup 2+} in ZnO at 4216, 4240, and 4247 cm{sup ?1} is investigated by means of Fourier transform IR absorption spectroscopy. A stress Hamiltonian is constructed which accounts for the behavior of these transitions under uniaxial stress. It is shown that the split pattern and polarization properties of these IR absorption lines are consistent with a dynamic Jahn-Teller effect in the {sup 3}T{sub 2}(F) state of Ni.

Lavrov, E. V.; Herklotz, F. [Technische Universität Dresden, 01062 Dresden (Germany); Kutin, Y. S. [Kazan Federal University, Federal Center of Shared Facilities, 420008 Kazan (Russian Federation)

2014-02-21T23:59:59.000Z

91

Kinetics of Mixed Ni-Al Precipitate Formation on a Soil Clay Fraction  

E-Print Network [OSTI]

Kinetics of Mixed Ni-Al Precipitate Formation on a Soil Clay Fraction D A R R Y L R . R O B E R Management Laboratory, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland The kinetics of mixed Ni-Al Ni- Al LDH formation. The initial Ni concentration was 3 mM with a solid/solution ratio of 10 g L-1

Sparks, Donald L.

92

INVESTIGATION OF NOVEL ALLOY TiC-Ni-Ni3Al FOR SOLID OXIDE FUEL CELL INTERCONNECT APPLICATIONS  

SciTech Connect (OSTI)

Solid oxide fuel cell interconnect materials must meet stringent requirements. Such interconnects must operate at temperatures approaching 800 C while resisting oxidation and reduction, which can occur from the anode and cathode materials and the operating environment. They also must retain their electrical conductivity under these conditions and possess compatible coefficients of thermal expansion as the anode and cathode. Results are presented in this report for fuel cell interconnect candidate materials currently under investigation based upon nano-size titanium carbide (TiC) powders. The TiC is liquid phase sintered with either nickel (Ni) or nickel-aluminide (Ni{sub 3}Al) in varying concentrations. The oxidation resistance of the submicron grain TiC-metal materials is presented as a function weight change versus time at 700 C and 800 C for varying content of metal/intermetallic in the system. Electrical conductivity at 800 C as a function of time is also presented for TiC-Ni to demonstrate the vitality of these materials for interconnect applications. TGA studies showed that the weight gain was 0.8 mg/cm{sup 2} for TiC(30)-Ni(30wt.%) after 100 hours in wet air at 800 C and the weight gain was calculated to be 0.5205 mg/cm{sup 2} for TiC(30)- Ni(10 wt.%) after 100 hours at 700 C and 100 hours at 800 C. At room temperature the electrical conductivity was measured to be 2444 1/[ohm.cm] for TiC-Ni compositions. The electrical conductivities at 800 C in air was recorded to be 19 1/[ohm.cm] after 125 hours. Two identical samples were supplied to PNNL (Dr. Jeff Stevenson) for ASR testing during the pre-decision period and currently they are being tested there. Fabrication, oxidation resistance and electrical conductivity studies indicate that TiC-Ni-Ni{sub 3}Al ternary appears to be a very important system for the development of interconnect composition for solid oxide fuel cells.

Rasit Koc; Geoffrey Swift; Hua Xie

2005-01-25T23:59:59.000Z

93

Shape memory response of ni2mnga and nimncoin magnetic shape memory alloys under compression  

E-Print Network [OSTI]

In this study, the shape memory response of Ni2MnGa and NiMnCoIn magnetic shape memory alloys was observed under compressive stresses. Ni2MnGa is a magnetic shape memory alloy (MSMA) that has been shown to exhibit fully reversible, stressassisted...

Brewer, Andrew Lee

2009-05-15T23:59:59.000Z

94

Oxygen Reduction Activity of PtxNi1-x Alloy Nanoparticles on Multiwall Carbon Nanotubes  

E-Print Network [OSTI]

PtxNi1 - x nanoparticles (Pt:Ni; 1:0, 4:1, 3:1 and 0.7:1) of ~5 nm, were synthesized on carboxylic acid-functionalized multiwall carbon nanotubes (PtxNi1 - x NPs/MWNT). The oxygen reduction reaction (ORR) activity measurements ...

Kim, Junhyung

95

Vacancy-Vacancy Interactions in NiAl Matthew O. Zacate and Gary S. Collins  

E-Print Network [OSTI]

Vacancy-Vacancy Interactions in NiAl Matthew O. Zacate and Gary S. Collins Department of Physics, Washington State University, Pullman, WA 99164, USA Keywords: point defect, vacancy, defect interaction, intermetallic compound, perturbed angular correlation, PAC, NiAl Abstract. Interactions between Ni vacancies

Collins, Gary S.

96

Monopole resonance strengths in Ni-58 and Pb-208  

E-Print Network [OSTI]

Giant monopole resonance strengths were obtained from small angle inelastic alpha scattering on Ni-58 and Pb-208 using deformed potential and folding models. Folding model analyses increase the sum rule strength in both nuclei, with 160% of the E0...

Youngblood, David H.

1997-01-01T23:59:59.000Z

97

Precipitation in 9Ni-12Cr-2Cu maraging steels  

SciTech Connect (OSTI)

Two maraging steels with the compositions 9Ni-12Cr-2Cu-4Mo (wt%) and 9Ni-12Cr-2Cu and with small additions of Al and Ti were investigated using atom probe field ion microscopy. Tomographic atom probe investigations were performed to clarify the spatial distribution of elements in and close to the precipitates. Materials heat treated at 475 C for 5, 25 min, 1, 2, 4 and 400 h were analyzed. Precipitates in the Mo-rich material were observed already after 5 min of aging, while in the material without MO, precipitation started later. In both materials precipitation begins with the formation of Cu-rich particles which work as nucleation sites for a Ni-rich phase of type Ni{sub 3}(Ti,Al). A Mo-rich phase was detected in the Mo-rich steel after 2 h of aging. The distribution of alloying elements in the precipitates, their role in the precipitation process, and the mechanism of hardening in the two materials are discussed.

Stiller, K.; Haettestrand, M. [Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Physics] [Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Physics; Danoix, F. [Univ. de Rouen, Mont Saint Aignan (France). Lab. de Microscopie Ionique] [Univ. de Rouen, Mont Saint Aignan (France). Lab. de Microscopie Ionique

1998-11-02T23:59:59.000Z

98

Metal-to-Semiconductor Transition in Hexagonal NiS  

Science Journals Connector (OSTI)

Recent electrical resistivity measurements have shown that the hexagonal form of stoichiometric NiS exhibits an abrupt metal-to-semiconductor transition at 264°K. Neutron diffraction studies have shown that a first-order paramagnetic-to-antiferromagnetic transition also occurs at 264°K. No crystal lattice distortion is observed at the transition nor detected at 4.2°K, suggesting that this may be a transition of the kind considered by Adler and Brooks. The measured magnetic moment at 4.2°K is 1.66±0.08 ?? and at 260°K it is 150.±0.10 ?? indicating that the sublattice magnetization is within 10% of saturation immediately upon ordering. The neutron data also shown that no more than about 1% of the Ni atoms migrate to tetragonal interstitial sites on warming from 4.2°K to room temperature. Thus, Ni atom migration apparently plays no part in this transition. The powder magnetic susceptibility is 2.24×10-6 emu/g at 300°K and is virtually temperature-independent above the transition. ? increases abruptly at 264°K by about 15% and exhibits some field-cooling effects. Studies on the compounds NiXS, for X=1.01, 0.99, 0.97, and 0.94 show that excess sulfur lowers the transition temperature.

JOSEPH T. SPARKS and TED KOMOTO

1968-10-01T23:59:59.000Z

99

Directional solidification studies in Ni-Al alloys  

SciTech Connect (OSTI)

Three solid phases are involved in the phase equilibria of the intermetallic compound Ni{sub 3}Al near its melting point, {beta}, {gamma}{prime}(Ni{sub 3}Al), and {gamma}. The generally-accepted phase diagram involves a eutectic reaction between {beta}{prime} and {gamma}, but some recent studies agree with an older diagram due to Schramm, which has a eutectic reaction between the {beta} and {gamma}{prime} phases. The phase equilibria near Ni{sub 3}Al compositions was evaluated using quenched directional solidification experiments, that preserve the microstructures tonned at the solidification front, and using diffusion couple experiments. These experiments show that eutectic forms between {beta} and {gamma}{prime} phases, as in the Schramm diagram. Growth and phase transformations of these three phases are also studied in the directional solidification experiments. Microstructure analysis shows that etching of Ni{sub 3}Al({gamma}{prime}) is very sensitive to small composition variations and crystallographic orientation changes. The eutectic solidification study confirms that the equilibrium eutectic is {gamma}{prime}+{beta}, and that the metastable {gamma}+{beta} eutectic might be also produced in this system according to the impurities, solidification rates, and composition variations.

Lee, Je-hyun

1993-05-01T23:59:59.000Z

100

NTS-2 Ni-H/sub 2/ battery - an update  

SciTech Connect (OSTI)

This paper presents an extensive data base for future Ni-H/sub 2/ spacecraft batteries. End of-discharge (EOD) voltages for the eight eclipse seasons are presented along with long-term pressure data derived from a strain gauge mounted on the dome of a cell. The use of temperature for charge control is also evaluated. 5 refs.

Stockel, J.F.

1981-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

STAR CLUSTER COMPLEXES AND THE HOST GALAXY IN THREE H II GALAXIES: Mrk 36, UM 408, AND UM 461  

SciTech Connect (OSTI)

We present a stellar population study of three H II galaxies (Mrk 36, UM 408, and UM 461) based on the analysis of new ground-based high-resolution near-infrared J, H, and K{sub p} broadband and Br{gamma} narrowband images obtained with Gemini/NIRI. We identify and determine the relative ages and masses of the elementary star clusters and/or star cluster complexes of the starburst regions in each of these galaxies by comparing the colors with evolutionary synthesis models that include the contribution of stellar continuum, nebular continuum, and emission lines. We found that the current star cluster formation efficiency in our sample of low-luminosity H II galaxies is {approx}10%. Therefore, most of the recent star formation is not in massive clusters. Our findings seem to indicate that the star formation mode in our sample of galaxies is clumpy, and that these complexes are formed by a few massive star clusters with masses {approx}>10{sup 4} M{sub Sun }. The age distribution of these star cluster complexes shows that the current burst started recently and likely simultaneously over short timescales in their host galaxies, triggered by some internal mechanism. Finally, the fraction of the total cluster mass with respect to the low surface brightness (or host galaxy) mass, considering our complete range in ages, is less than 1%.

Lagos, P. [Centro de Astrofisica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto (Portugal); Telles, E. [Observatorio Nacional, Rua Jose Cristino, 77, Rio de Janeiro 20921-400 (Brazil); Nigoche-Netro, A. [Instituto de Astrofisica de Andalucia (IAA), Glorieta de la Astronomia s/n, 18008 Granada (Spain); Carrasco, E. R., E-mail: plagos@astro.up.pt, E-mail: etelles@on.br, E-mail: nigoche@iaa.es, E-mail: rcarrasco@gemini.edu [Gemini Observatory/AURA, Southern Operations Center, Casilla 603, La Serena (Chile)

2011-11-15T23:59:59.000Z

102

Investigating magnetic proximity effects in NiO/Pd with polarized neutron reflectometry  

Science Journals Connector (OSTI)

With polarized neutron reflectometry we investigated NiO/Pd heterostructures for the presence of a magnetic proximity effect, which is expected to produce an induced ferromagnetic moment in Pd. Using a specific isotope mixture of Ni in the preparation of NiO, the chemical contrast across the Pd/NiO interface was greatly suppressed, thus enhancing sensitivity to magnetic contrast at the reflecting interface. Despite enhanced sensitivity, no evidence for a proximity effect was observed. If present, the magnetic moment per Pd atom could not be more than 0.01?B, regardless of Pd layer thickness, crystalline interface orientation, and number of NiO/Pd bilayers.

A. Hoffmann; M. R. Fitzsimmons; J. A. Dura; C. F. Majkrzak

2001-12-19T23:59:59.000Z

103

Interdiffusion in NiMnSb/V/NiMnSb: X-ray and neutron reflectivity investigation of ion beam sputtered trilayer systems  

SciTech Connect (OSTI)

The new trilayer system NiMnSb/V/NiMnSb on MgO(001) was investigated by means of vibrating sample magnetometry (VSM), x-ray, and neutron reflectivity. VSM revealed a coercive field H{sub c}=23 Oe and a hysteresis loop similar to that of an uncoupled ferromagnet. The x-ray and neutron reflectivity data proved that interface roughnesses of 10 {Angstrom} are present. A detailed analysis yielded significant interdiffusion at the NiMnSb/V interfaces which is one possible explanation for the weak magnetoresistance effect measured in similar NiMnSb-based multilayer systems. {copyright} {ital 1999 American Institute of Physics.}

Schlomka, J.; Tolan, M.; Press, W. [Institut fuer Experimentelle und Angewandte Physik, Christian-Albrechts-Universitaet zu Kiel, 24098 Leibnizstrasse 17-19, Kiel (Germany)] [Institut fuer Experimentelle und Angewandte Physik, Christian-Albrechts-Universitaet zu Kiel, 24098 Leibnizstrasse 17-19, Kiel (Germany); Fitzsimmons, M.R. [Manuel Lujan, Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Manuel Lujan, Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Siebrecht, R. [Institut Laue-Langevin, 38042 Grenoble, Cedex 9 (France)] [Institut Laue-Langevin, 38042 Grenoble, Cedex 9 (France); Schubert, D.W. [GKSS Forschungszentrum, 21502 Geesthacht (Germany)] [GKSS Forschungszentrum, 21502 Geesthacht (Germany); Simon, P. [Max Planck Institut fuer Polymerforschung, 55021 Mainz (Germany)] [Max Planck Institut fuer Polymerforschung, 55021 Mainz (Germany)

1999-11-01T23:59:59.000Z

104

First-principles investigations of Ni3Al(111) and NiAl(110) surfaces at metal dusting conditions  

SciTech Connect (OSTI)

We investigate the structure and surface composition of the {gamma}{prime}-Ni{sub 3}Al(111) and {beta}-NiAl(110) alloy surfaces at conditions relevant for metal dusting corrosion related to catalytic steam reforming of natural gas. In regular service as protective coatings, nickel-aluminum alloys are protected by an oxide scale, but in case of oxide scale spallation, the alloy surface may be directly exposed to the reactive gas environment and vulnerable to metal dusting. By means of density functional theory and thermochemical calculations for both the Ni{sub 3}Al and NiAl surfaces, the conditions under which CO and OH adsorption is to be expected and under which it is inhibited, are mapped out. Because CO and OH are regarded as precursors for nucleating graphite or oxide on the surfaces, phase diagrams for the surfaces provide a simple description of their stability. Specifically, this study shows how the CO and OH coverages depend on the steam to carbon ratio (S/C) in the gas and thereby provide a ranking of the carbon limits on the different surface phases.

Saadi, Souheil

2011-03-01T23:59:59.000Z

105

Low-temperature magnetization in Ni-rich gamma-Ni100-x-yFexVy alloys  

E-Print Network [OSTI]

is antiferromagnetic) suppresses the ferromagnetic order in the NiFe binary alloys. The magnetization of the alloys with low V (y less than or equal to 11 at. %) has shown a good fit to only the spin-wave T-3/2 term whereas the data for the high V (gamma greater than...

Chakraborty, S.; Mukherjee, GD; Rathnayaka, KDD; Naugle, Donald G.; Majumdar, AK.

2000-01-01T23:59:59.000Z

106

Effect of Composition on the Solidification Behavior of Several Ni-Cr-Mo and Fe-Ni-Cr-Mo Alloys  

E-Print Network [OSTI]

simulate the solidifi- cation behavior of dissimilar welds made between AL-6XN and Ni-base filler metals.[3 differential thermal analysis (DTA) samples and welded specimens. This explains the in- variance of the amount of eutectic constituent observed in the microstructure in the welded and DTA conditions. Multicomponent

DuPont, John N.

107

El Ni~no and La Ni~na: Causes and Global Consequences Michael J McPhaden  

E-Print Network [OSTI]

releases heat into the middle and upper troposphere. This heat provides a source of energy to drive global wind fields that extend El Ni~no's influence to remote parts of the planet. Altered circulation patterns produce droughts, floods, unusual storminess, heat waves, and other weather extremes that have

108

Which Optical Smoothing for LMJ and NIF ? Centre de Mathmatiques Appliques, CNRS URA 756,  

E-Print Network [OSTI]

, specially in the light of the US National Ignition Facility project2 and the French Laser MegaJoule project3 incoherent broad source or a frequency modulated laser beam using phase modulators. In a next step this broad components so as to produce on target a moving speckle pattern (with Gaussian statistics for the electric

Garnier, Josselin

109

IEEE TRANSACTIONS ON MAGNETICS, VOL. 38, NO. 4, JULY 2002 1803 New Ni5Al3 Underlayer for Longitudinal  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON MAGNETICS, VOL. 38, NO. 4, JULY 2002 1803 New Ni5Al3 Underlayer--We describe a new Ni5Al3 underlayer for high-den- sity longitudinal magnetic recording. The Ni5Al3 underlayer has the FCC derivative Ga3Pt5 structure. The Ni5Al3 (221) plane has good lattice match with the Co

Laughlin, David E.

110

In situ Study of the Formation of Silicide Phases in Amorphous Ni-Si Mixed Layers  

SciTech Connect (OSTI)

In this paper, we investigated Ni silicide phase formation when Si is added within an as deposited 50 nm Ni film. A series of 22 samples with a Si content varying from 0 to 50 at.% was prepared and systematically investigated with in situ x-ray diffraction. The inert oxide substrate was used to identify the phases which first crystallize in an amorphous Ni-Si mixture of a given concentration. The noncongruent silicides Ni{sub 3}Si and Ni{sub 3}Si{sub 2} are never observed to crystallize readily out of the mixture. A remarkable observation is the initial crystallization at low temperature of a hexagonal Ni-silicide, observed over a broad mixed layer composition [35-49%Si]; this hexagonal phase nucleates readily as a single phase [39-47%Si] or together with Ni{sub 2}Si [35-38%Si] or NiSi [49%Si]. This low-temperature phase is related to the high temperature {theta}-phase, but covers a wide composition range up to 47%Si. For the same Ni-Si films deposited on Si(100), the initial nucleation of the Ni(Si) mixture is similar as for the samples deposited on SiO{sub 2}, such that the complex sequence of metal-rich Ni-silicide phases typically observed during Ni/Si reactions is modified. For samples containing more than 21%Si, a simpler sequential phase formation was observed upon annealing. From pole figures, the phase formation sequence was observed to have a significant influence on the texture of the technologically relevant NiSi phase. For mixture composition ranging from 38% to 43%Si, the initial transient {theta}-phase appears extremely textured on Si(100). The observed transient appearance of a hexagonal phase is of importance in understanding the phase formation mechanisms in the Ni-Si system.

Van Bockstael, C.; Detavernier, C; Van Meirhaeghe, R; Jordan-Sweet, J; Lavoie, C

2009-01-01T23:59:59.000Z

111

E-Print Network 3.0 - auto-erotismo um vazio Sample Search Results  

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

p e bi-racional1); (c) q : Z Pn-1 e um fibrado de linhas ... Source: Ferreira dos Santos, Pedro - Departamento de Matemtica, Instituto Superior Tcnico, Universidade...

112

E-Print Network 3.0 - aftosa recorrente um Sample Search Results  

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

de... a contento. Para substanciar esta afirmao, cita-se um percentual de projetos mal sucedidos extrado de Source: Endler, Markus - Departamento de Informtica,...

113

E-Print Network 3.0 - adulto um conceito Sample Search Results  

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

o Brasil para se instalar em Porto Alegre. A mudana tinha um motivo convincente: - Vim fazer... Fsica da Universidade Federal do Rio Grande do Sul (UFRGS), que recebeu...

114

E-Print Network 3.0 - anos em um Sample Search Results  

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

o Brasil para se instalar em Porto Alegre. A mudana tinha um motivo convincente: - Vim fazer... nmero de programas excelentes. - Quando terminar o doutorado, vou t-lo...

115

E-Print Network 3.0 - associados um estudo Sample Search Results  

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

eu no tenho que... para um estudo eficaz. ... Source: Instituto de Sistemas e Robotica - Polo de Lisboa (Institute for Systems and Robotics, Lisbon pole) Portugal...

116

Recovery Act: Novel Kerf-Free PV Wafering that provides a low-cost approach to generate wafers from 150um to 50um in thickness  

SciTech Connect (OSTI)

The technical paper summarizes the project work conducted in the development of Kerf-Free silicon wafering equipment for silicon solar wafering. This new PolyMax technology uses a two step process of implantation and cleaving to exfoliate 50um to 120um wafers with thicknesses ranging from 50um to 120um from a 125mm or 156mm pseudo-squared silicon ingot. No kerf is generated using this method of wafering. This method of wafering contrasts with the current method of making silicon solar wafers using the industry standard wire saw equipment. The report summarizes the activity conducted by Silicon Genesis Corporation in working to develop this technology further and to define the roadmap specifications for the first commercial proto-type equipment for high volume solar wafer manufacturing using the PolyMax technology.

Fong, Theodore E.

2013-05-06T23:59:59.000Z

117

Environmentally Assisted Cracking of Ni-Base Alloys [Corrosion and  

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

LWRs > Environmentally Assisted LWRs > Environmentally Assisted Cracking of Ni-Base Alloys Capabilities Materials Testing Environmentally Assisted Cracking (EAC) of Reactor Materials Corrosion Performance/Metal Dusting Overview Light Water Reactors Fatigue Testing of Carbon Steels and Low-Alloy Steels Environmentally Assisted Cracking of Ni-Base Alloys Irradiation-Induced Stress Corrosion Cracking of Austenitic Stainless Steels Steam Generator Tube Integrity Program Air Oxidation Kinetics for Zr-based Alloys Fossil Energy Fusion Energy Metal Dusting Publications List Irradiated Materials Steam Generator Tube Integrity Other Facilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Corrosion and Mechanics of Materials Light Water Reactors

118

In situ Oxidation of Ultrathin Silver Films on Ni(111)  

SciTech Connect (OSTI)

Oxidation of silver films of one- and two-monolayer thicknesses on the Ni(111) surface was investigated by low-energy electron microscopy at temperatures of 500 and 600 K. Additionally, intensity-voltage curves were measured in situ during oxidation to reveal the local film structure on a nanometer scale. At both temperatures, we find that exposure to molecular oxygen leads to the destabilization of the Ag film with subsequent relocation of the silver atoms to small few-layer-thick silver patches and concurrent evolution of NiO(111) regions. Subsequent exposure of the oxidized surface to ethylene initiates the transformation of bilayer islands back into monolayer islands, demonstrating at least partial reversibility of the silver relocation process at 600 K.

A Meyer; I Flege; S Senanayake; B Kaemena; R Rettew; F Alamgir; J Falta

2011-12-31T23:59:59.000Z

119

Coulomb excitation of $^{68}$Ni at safe energies  

E-Print Network [OSTI]

The $B(E2;0^+\\to2^+)$ value in $^{68}$Ni has been measured using Coulomb excitation at safe energies. The $^{68}$Ni radioactive beam was post-accelerated at the ISOLDE facility (CERN) to 2.9 MeV/u. The emitted $\\gamma$ rays were detected by the MINIBALL detector array. A kinematic particle reconstruction was performed in order to increase the measured c.m. angular range of the excitation cross section. The obtained value of 2.8$^{+1.2}_{-1.0}$ 10$^2$ e$^2$fm$^4$ is in good agreement with the value measured at intermediate energy Coulomb excitation, confirming the low $0^+\\to2^+$ transition probability.

N. Bree; I. Stefanescu; P. A. Butler; J. Cederkäll; T. Davinson; P. Delahaye; J. Eberth; D. Fedorov; V. N. Fedosseev; L. M. Fraile; S. Franchoo; G. Georgiev; K. Gladnishki; M. Huyse; O. Ivanov; J. Iwanicki; J. Jolie; U. Köster; Th. Kröll; R. Krücken; B. A. Marsh; O. Niedermaier; P. Reiter; H. Scheit; D. Schwalm; T. Sieber; J. Van de Walle; P. Van Duppen; N. Warr; D. Weisshaar; F. Wenander; S. Zemlyanoy

2008-03-05T23:59:59.000Z

120

Magnetic field-induced phase transformation and variant reorientation in Ni2MnGa and NiMnCoIn magnetic shape memory alloys  

E-Print Network [OSTI]

The purpose of this work is to reveal the governing mechanisms responsible for the magnetic field-induced i) martensite reorientation in Ni2MnGa single crystals, ii) stress-assisted phase transformation in Ni2MnGa single crystals and iii) phase...

Karaca, Haluk Ersin

2009-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

Electron Density Distributions Calculated for the Nickel Sulfides Millerite, Vaesite, and Heazlewoodite and Nickel Metal: A Case for the Importance of Ni-Ni Bond Paths for  

E-Print Network [OSTI]

Electron Density Distributions Calculated for the Nickel Sulfides Millerite, Vaesite, and Heazlewoodite and Nickel Metal: A Case for the Importance of Ni-Ni Bond Paths for Electron Transport G. V. Gibbs point properties (the electron density (F) and the Hessian of F at the bond critical points (bcp

Downs, Robert T.

122

Formation and Stability of Ni-Al Hydroxide Phases in Soils  

SciTech Connect (OSTI)

The formation of mixed metal-aluminum hydroxide surface precipitates is a potentially significant uptake route for trace metals (including Co, Ni, and Zn) in environmental systems. This paper investigates the effect of mixed Ni-Al hydroxide precipitate formation and aging on Ni solubility and bioavailability in laboratory contaminated soils. Two Delaware agricultural soils were reacted with a 3 mM Ni solution for 12 months at pH's above and below the threshold for mixed Ni-Al hydroxide formation. Ni speciation was determined at 1, 6, and 12 months using X-ray absorption spectroscopy (XAS). Precipitate solubility was examined through desorption experiments using HNO{sub 3} and EDTA as desorbing agents, whereas metal bioavailability was assessed using a Ni-specific bacterial biosensor. For both soils, the formation of Ni-Al hydroxide surface precipitates resulted in a reduction in the fraction of desorbed and bioavailable Ni. However, precipitate dissolution was greater, particularly with EDTA, than in published studies on isolated soil clay fractions, and less affected by aging processes. These results suggest that mixed Ni-Al hydroxide phases forming in real world environments may be both longer-lasting and more susceptible to ligand-promoted dissolution than previously expected.

Peltier, E.; Van Der Lelie, D; Sparks, D

2010-01-01T23:59:59.000Z

123

Electronic structure of Co-Ni-Ga Heusler alloys studied by resonant photoemission  

SciTech Connect (OSTI)

The electronic structures of Co{sub 2.01}Ni{sub 1.05}Ga{sub 0.94} and Co{sub 1.76}Ni{sub 1.46}Ga{sub 0.78} Heusler alloys have been investigated by resonant photoemission spectroscopy across the 3p-3d transition of Co and Ni. For the Ni excess composition Co{sub 1.76}Ni{sub 1.46}Ga{sub 0.78}, the valence band peak shows a shift of 0.25 eV as compared to the near stoichiometric composition Co{sub 2.01}N1{sub 1.05}Ga{sub 0.94}. Also an enhancement is observed in the Ni related satellite features in the valence band for the Ni excess composition. Due to hybridization of Co and Ni 3d states in these systems, the Co and Ni 3p-3d resonance energies are found to be higher as compared to Co and Ni metals. Theoretical first principle calculation is performed to understand the features in the valence band and the shape of the resonance profile.

Baral, Madhusmita, E-mail: madhusmita@rrcat.gov.in; Banik, Soma, E-mail: madhusmita@rrcat.gov.in; Ganguli, Tapas, E-mail: madhusmita@rrcat.gov.in; Chakrabarti, Aparna, E-mail: madhusmita@rrcat.gov.in; Deb, S. K. [Indus Synchrotrons Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore-452013 (India); Thamizhavel, A. [Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005 (India); Wadikar, Avinash; Phase, D. M. [UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore-452017 (India)

2014-04-24T23:59:59.000Z

124

Proton spectroscopy of 48Ni, 46Fe, and 44Cr  

E-Print Network [OSTI]

Results of decay spectroscopy on nuclei in vicinity of the doubly magic 48Ni are presented. The measurements were performed with a Time Projection Chamber with optical readout which records tracks of ions and protons in the gaseous volume. Six decays of 48Ni including four events of two-proton ground-state radioactivity were recorded. An advanced reconstruction procedure yielded the 2p decay energy for 48Ni of Q2p = 1.29(4) MeV. In addition, the energy spectra of \\b{eta}-delayed protons emitted in the decays of 44Cr and 46Fe, as well as half-lives and branching ratios were determined. The results were found to be consistent with the previous measurements made with Si detectors. A new proton line in the decay of 44Cr corresponding to the decay energy of 760 keV is reported. The first evidence for the \\b{eta}2p decay of 46 Fe, based on one clear event, is shown.

M. Pomorski; M. Pfützner; W. Dominik; R. Grzywacz; A. Stolz; T. Baumann; J. S. Berryman; H. Czyrkowski; R. D?browski; A. Fija?kowska; T. Ginter; J. Johnson; G. Kami?ski; N. Larson; S. N. Liddick; M. Madurga; C. Mazzocchi; S. Mianowski; K. Miernik; D. Miller; S. Paulauskas; J. Pereira; K. P. Rykaczewski; S. Suchyta

2014-07-06T23:59:59.000Z

125

Single-crystal neutron diffraction studies on Ni-based metal-pnictide superconductor BaNi2As2  

SciTech Connect (OSTI)

We report the results of single-crystal neutron diffraction studies of the superconductor BaNi{sub 2}As{sub 2}. The experiments were performed on a tiny crystal of mass 0.8 mg at several temperatures between 20 and 200 K using the Single Crystal Diffractometer, SCD, at the Los Alamos Neutron Science Center. Above 130 K, BaNi{sub 2}As{sub 2} crystallizes in the tetragonal ThCr{sub 2}Si{sub 2} structure. Our neutron diffraction data corroborate a first-order structural transition around 130 K with a relatively large hysteresis of about 10K, in agreement with observations from bulk studies. The anisotropic thermal displacement coefficients are enhanced along c-axis approaching the transition, and a splitting is observed for in-plane type reflections below the transition, which is evidence for a change in crystal structure.

Kothapalli, Karunakar [Los Alamos National Laboratory; Ronning, F [Los Alamos National Laboratory; Bauer, E D [Los Alamos National Laboratory; Schultz, A J [Los Alamos National Laboratory; Nakotte, Heinz [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

126

Ni62(n,?) and Ni63(n,?) cross sections measured at the n_TOF facility at CERN  

Science Journals Connector (OSTI)

The cross section of the Ni62(n,?) reaction was measured with the time-of-flight technique at the neutron time-of-flight facility n_TOF at CERN. Capture kernels of 42 resonances were analyzed up to 200 keV neutron energy and Maxwellian averaged cross sections (MACS) from kT= 5–100 keV were calculated. With a total uncertainty of 4.5%, the stellar cross section is in excellent agreement with the the KADoNiS compilation at kT=30 keV, while being systematically lower up to a factor of 1.6 at higher stellar temperatures. The cross section of the Ni63(n,?) reaction was measured for the first time at n_TOF. We determined unresolved cross sections from 10 to 270 keV with a systematic uncertainty of 17%. These results provide fundamental constraints on s-process production of heavier species, especially the production of Cu in massive stars, which serve as the dominant source of Cu in the solar system.

C. Lederer et al. (n_TOF Collaboration)

2014-02-28T23:59:59.000Z

127

Computational Study of Sulfur–nickel Interactions: A New S–Ni Phase Diagram  

SciTech Connect (OSTI)

Prediction of the interactions between H2S-contaminated hydrogen fuel and Ni surfaces under conditions similar to those for solid oxide fuel cell (SOFC) operation using DFT (density function theory) calculations (with thermodynamic corrections) has resulted in a new S–Ni phase diagram, which suggests the existence of an intermediate state between clean Ni surfaces and nickel sulfides – sulfur atoms adsorbed on Ni surfaces. This prediction is consistent with many experimental observations relevant to sulfur poisoning of Nibased anodes in SOFCs, which cannot be explained using the existing S–Ni bulk phase diagram from classical thermodynamics. The accurate prediction of the adsorption phase is vital to a fundamental understanding of the sulfur poisoning mechanism of Ni-based anodes under SOFC operating conditions.

Wang, Jeng-Han; Liu, Meilin

2007-06-22T23:59:59.000Z

128

PT AND PT/NI "NEEDLE" ELETROCATALYSTS ON CARBON NANOTUBES WITH HIGH ACTIVITY FOR THE ORR  

SciTech Connect (OSTI)

Platinum and platinum/nickel alloy electrocatalysts supported on graphitized (gCNT) or nitrogen doped carbon nanotubes (nCNT) are prepared and characterized. Pt deposition onto carbon nanotubes results in Pt 'needle' formations that are 3.5 nm in diameter and {approx}100 nm in length. Subsequent Ni deposition and heat treatment results in PtNi 'needles' with an increased diameter. All Pt and Pt/Ni materials were tested as electrocatalysts for the oxygen reduction reaction (ORR). The Pt and Pt/Ni catalysts showed excellent performance for the ORR, with the heat treated PtNi/gCNT (1.06 mA/cm{sup 2}) and PtNi/nCNT (0.664 mA/cm{sup 2}) showing the highest activity.

Colon-Mercado, H.

2011-11-10T23:59:59.000Z

129

INTERPRTATION DES FAUTES D'EMPILEMENT DANS L'ANTIFERROMAGNTIQUE K2NiF4  

E-Print Network [OSTI]

859. INTERPR�TATION DES FAUTES D'EMPILEMENT DANS L'ANTIFERROMAGN�TIQUE K2NiF4 Par R. PLUMIER. 2014 Nous montrons qu'une légère déformation orthorhombique de la maille de K2NiF4 entraîne parNiF4 cell leads to a decrease of the free energy of the crystal through an exchange striction

Boyer, Edmond

130

Ni(II) Sorption on Biogenic Mn-Oxides with Varying Mn  

E-Print Network [OSTI]

Ni(II) Sorption on Biogenic Mn-Oxides with Varying Mn Octahedral Layer Structure M E N G Q I A N G(II) sorption mechanisms were determined at pH 7 and at different Ni(II) loadings, using isotherm and extended X in the interlayer of the BioMnOx and the maximum Ni(II) sorption capacity increases as the formation pH of Bio

Sparks, Donald L.

131

NiSource Energy Technologies Inc.: System Integration of Distributed Power for Complete Building Systems  

SciTech Connect (OSTI)

Summarizes NiSource Energy Technologies' work under contract to DOE's Distribution and Interconnection R&D. Includes studying distributed generation interconnection issues and CHP system performance.

Not Available

2003-10-01T23:59:59.000Z

132

NiSource Energy Technologies: Optimizing Combined Heat and Power Systems  

SciTech Connect (OSTI)

Summarizes NiSource Energy Technologies' work under contract to DOE's Distribution and Interconnection R&D. Includes studying distributed generation interconnection issues and CHP system performance.

Not Available

2003-01-01T23:59:59.000Z

133

Reducible Supports for Ni-based Oxygen Carriers in Chemical Looping Combustion  

Science Journals Connector (OSTI)

Reducible Supports for Ni-based Oxygen Carriers in Chemical Looping Combustion ... Industrial & Engineering Chemistry Research2014 53 (42), 16341-16348 ...

Saurabh Bhavsar; Götz Veser

2013-03-29T23:59:59.000Z

134

Effect of Pt addition on Ni silicide formation at low temperature: Growth, redistribution, and solubility  

SciTech Connect (OSTI)

The formation of Ni silicide during the reaction between Ni(5% Pt) and a Si(100) substrate has been analyzed by differential scanning calorimetry (DSC), in situ x-ray diffraction (XRD), cross-sectional transmission electron microscopy (TEM), and {sup 4}He{sup +} Rutherford backscattering. The DSC measurements show evidence of the Ni{sub 2}Si nucleation followed by lateral growth formation. In situ XRD and TEM have been used to investigate the sequence of formation of the silicides. These experiments show that the formations of Ni{sub 2}Si and NiSi occur simultaneously in the presence of the Pt alloy. The redistribution of platinum at different stages of the Ni silicide growth has been determined. We have estimated the solubility limit of platinum (1 at. % at 573 K) in the Ni{sub 2}Si phase by extrapolation from a measured value at 1073 K. This redistribution is explained in terms of the solubility limits and the diffusion of Pt in the Ni{sub 2}Si and NiSi phases. Pt is more likely to reside at the silicide grain boundaries and the interfaces where it can slow down the silicide growth kinetics.

Hoummada, K.; Perrin-Pellegrino, C.; Mangelinck, D. [Aix-Marseille Universite, IM2NP, Campus de Saint-Jerome, Avenue Escadrille Normandie Niemen-Case 142, F-13397 Marseille Cedex (France); CNRS, IM2NP (UMR 6242), Case 142, Faculte de Saint-Jerome, F-13397 Marseille Cedex (France)

2009-09-15T23:59:59.000Z

135

Improved oxidation sulfidation resistance of Fe-Cr-Ni alloys  

DOE Patents [OSTI]

High temperature resistance of Fe-Cr-Ni alloy compositions to oxidative and/or sulfidative conditions is provided by the incorporation of about 1 to 8 wt % of Zr or Nb and results in a two-phase composition having an alloy matrix as the first phase and a fine grained intermetallic composition as the second phase. The presence and location of the intermetallic composition between grains of the matrix provides mechanical strength, enhanced surface scale adhesion, and resistance to corrosive attack between grains of the alloy matrix at temperatures of 500 to 1000/sup 0/C.

Natesan, K.; Baxter, D.J.

1983-07-26T23:59:59.000Z

136

Bimetallic Fe–Ni Oxygen Carriers for Chemical Looping Combustion  

Science Journals Connector (OSTI)

(2-4) In CLC (schematic in Figure 1), a fuel is combusted in a fuel reactor (“reducer”) in contact with an oxygen carrier (typically a metal oxide). ... After combustion of the fuel, the reduced metal is then transferred to the air reactor (“oxidizer”) where it is reoxidized by air, and then circulated back to the reducer to close the material “loop”. ... Son, S. R.; Kim, S. D.Chemical-looping combustion with NiO and Fe2O3 in a thermobalance and circulating fluidized bed reactor with double loops Ind. Eng. ...

Saurabh Bhavsar; Götz Veser

2013-05-20T23:59:59.000Z

137

Stable atomic structure of NiTi austenite  

SciTech Connect (OSTI)

Nitinol (NiTi), the most widely used shape-memory alloy, exhibits an austenite phase that has yet to be identified. The usually assumed austenitic structure is cubic B2, which has imaginary phonon modes, hence it is unstable. We suggest a stable austenitic structure that “on average” has B2 symmetry (observed by x-ray and neutron diffraction), but it exhibits finite atomic displacements from the ideal B2 sites. The proposed structure has a phonon spectrum that agrees with that from neutron scattering, has diffraction spectra in agreement with x-ray diffraction, and has an energy relative to the ground state that agrees with calorimetry data.

Zarkevich, Nikolai A [Ames Laboratory; Johnson, Duane D [Ames Laboratory

2014-08-01T23:59:59.000Z

138

Semiconducting p-type MgNiO:Li epitaxial films fabricated by cosputtering method  

SciTech Connect (OSTI)

Li-doped ternary Mg{sub x}Ni{sub 1-x}O thin films were deposited on (0001) Al{sub 2}O{sub 3} substrates by a radio frequency (RF) magnetron cosputtering method with MgO and NiO:Li targets. The Mg mole fraction and Li content were relatively controlled by changing RF power for the MgO target over a range of 0-300 W, while the NiO:Li target was kept at 150 W. As a result, all films were epitaxially grown on (0001) Al{sub 2}O{sub 3} substrates with the relationship of [110]{sub NiO}||[1110]{sub Al2O3}, [112]{sub NiO}||[2110]{sub Al2O3} (in-plane), and [111]{sub NiO}||[0001]{sub Al2O3} (out-of-plane), and showed p-type semiconducting properties. Furthermore, from x-ray diffraction patterns, the authors found that MgO was effectively mixed with NiO:Li without structural deformation due to low lattice mismatch (0.8%) between NiO and MgO. However, the excess Li contents degraded the crystallinity of the MgNiO films. The band-gap of films was continuously shifted from 3.66 eV (339 nm) to 4.15 eV (299 nm) by the RF power of the MgO target. A visible transmittance of more than 80% was exhibited at RF powers higher than 200 W. Ultimately, the electrical resistivity of p-type MgNiO films was improved from 7.5 to 673.5 {Omega}cm, indicating that the Li-doped MgNiO films are good candidates for transparent p-type semiconductors.

Kwon, Yong Hun; Chun, Sung Hyun; Cho, Hyung Koun [School of Advanced Materials Science and Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of)

2013-07-15T23:59:59.000Z

139

Process and properties of electroless Ni-Cu-P-ZrO{sub 2} nanocomposite coatings  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer The Ni-P and Ni-P-Cu-ZrO{sub 2} coatings were produced by electroless technique. Black-Right-Pointing-Pointer The influence of copper and ZrO{sub 2} nanoparticles on Ni-P was studied. Black-Right-Pointing-Pointer Surface morphology, structure and electrochemical behavior were evaluated. Black-Right-Pointing-Pointer The Ni-Cu-P-ZrO{sub 2} and Ni-P-ZrO{sub 2} coatings are more resistant to corrosion than Ni-P. Black-Right-Pointing-Pointer Introduction of Cu and ZrO{sub 2} in the matrix aids to the enhancement of microhardness. -- Abstract: Electroless Ni-Cu-P-ZrO{sub 2} composite coating was successfully obtained on low carbon steel matrix by electroless plating technique. Coatings with different compositions were obtained by varying copper as ternary metal and nano sized zirconium oxide particles so as to obtain elevated corrosion resistant Ni-P coating. Microstructure, crystal structure and composition of deposits were analyzed by SEM, EDX and XRD techniques. The corrosion behavior of the deposits was studied by anodic polarization, Tafel plots and electrochemical impedance spectroscopy (EIS) in 3.5% sodium chloride solution. The ZrO{sub 2} incorporated Ni-P coating showed higher corrosion resistance than plain Ni-P. The introduction of copper metal into Ni-P-ZrO{sub 2} enhanced the protection ability against corrosion. The influence of copper metal and nanoparticles on microhardness of coatings was evaluated.

Ranganatha, S. [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India)] [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India); Venkatesha, T.V., E-mail: drtvvenkatesha@yahoo.co.uk [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India); Vathsala, K. [Nanotribology Laboratory, Mechanical engineering department, Indian Institute of Science, Bangalore (India)] [Nanotribology Laboratory, Mechanical engineering department, Indian Institute of Science, Bangalore (India)

2012-03-15T23:59:59.000Z

140

TSNo s02-roberts104537-O Microscopic and Spectroscopic Speciation of Ni in Soils in the Vicinity of a Ni Refinery.  

E-Print Network [OSTI]

in the Vicinity of a Ni Refinery. abstract Accurately predicting the fate and bioavailability of metals in smelter REFINERY ASA-CSSA-SSSA Annual Meetings - October 21 - 25, 2001 - Charlotte, NC #12;

Sparks, Donald L.

Note: This page contains sample records for the topic "ura ni um" 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

Self-assembly of Ni nanocrystals on HfO{sub 2} and N-assisted Ni confinement for nonvolatile memory application  

SciTech Connect (OSTI)

We demonstrate memory property using Ni nanocrystals with mean diameter of 9 nm embedded in HfO{sub 2} high-k dielectric that are formed via a self-assembly process by sputtering and rapid thermal annealing. X-ray photoelectron spectroscopy shows that Ni penetrates into the 5 nm HfO{sub 2} after high temperature annealing above 800 deg. C in N{sub 2}. However, the diffusion is suppressed by N incorporation into HfO{sub 2} by NH{sub 3} annealing. Metal-oxide-semiconductor structures were fabricated with Ni nanocrystals embedded in HfO{sub 2}. An additional counterclockwise hysteresis of 2.1 V due to the charge trapping properties of the Ni nanocrystals was observed from a {+-}5 V sweep during capacitance-voltage electrical measurement.

Tan, Zerlinda; Samanta, S.K.; Yoo, Won Jong; Lee, Sungjoo [Silicon Nano Device Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576 (Singapore)

2005-01-03T23:59:59.000Z

142

Verification of Ni magnetic moment in GdNi2 Laves phase by magnetic circular dichroism measurement  

Science Journals Connector (OSTI)

Investigation of the magnetic moment of nickel in the polycrystal GdNi2 Laves phase was carried out by means of magnetic circular dichroism (MCD) in the core-level x-ray-absorption spectroscopy. It was revealed that the nickel magnetic moment originating from the 3d state (band) does exist and couples antiparallel to that of gadolinium whose MCD was observed at the M4,5 absorption edge. That is, nickel retains an intrinsic magnetic moment even in the Laves phase concentration. Furthermore, by analyzing in terms of sum rule, the contribution of spin and orbital magnetic moments to the magnetic moment was evaluated and discussed.

M. Mizumaki; K. Yano; I. Umehara; F. Ishikawa; K. Sato; A. Koizumi; N. Sakai; T. Muro

2003-04-09T23:59:59.000Z

143

Suppression of carbon formation in steam reforming of methane by addition of Co into Ni/ZrO2 catalysts  

Science Journals Connector (OSTI)

We investigated the steam reforming of methane (SRM) over various NiCo bimetallic catalysts...2...to determine whether the addition of Co on the Ni catalyst suppressed carbon formation. The effect of metal loadin...

Dasika Harshini; Yongchai Kwon; Jonghee Han…

2010-03-01T23:59:59.000Z

144

Influence of the magnetic phase transition on secondary ion emission from disordered Ni-Pd compounds of various compositions  

Science Journals Connector (OSTI)

Variations in secondary ion emission (SIE) from polycrystals of ferromagnetic disordered Ni-Pd compounds irradiated by argon ions with energy of 10 keV are studied experimentally. A considerable reduction in Ni+ ...

K. F. Minnebaev; K. A. Tolpin…

2012-05-01T23:59:59.000Z

145

The Influence of Ni-Coated TiC on Laser-Deposited IN625 Metal Matrix Composites  

E-Print Network [OSTI]

The In?uence of Ni-Coated TiC on Laser-Deposited IN625 Metalwith Ni-coated and uncoated TiC reinforcement particles toand spatial distribution of TiC particles in the deposited

2010-01-01T23:59:59.000Z

146

E-Print Network 3.0 - aguda um estudo Sample Search Results  

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

por ano, nos Summary: isquemia miocrdica - (J Am Coll Cardiol 2000;35:825-80) No Brasil: estima-se um quantitativo de 4... 16 horas Estudo de Peacock et al, com 266 pts,...

147

E-Print Network 3.0 - assistido por um Sample Search Results  

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

de Coimbra Collection: Mathematics Page: << < 1 2 3 4 5 > >> Page: << < 1 2 3 4 5 > >> 41 Rodrigo de Proenca Gomes Controle Automatico de Summary: preciso fazer para se tornar um...

148

E-Print Network 3.0 - auditivas um estudo Sample Search Results  

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

de pesquisa em todas as reas acadmicas 74 Master majors (74... VErSiDADE DE SASKAtCHEwAN Language Centre | 2 12;Um programa slido enriquecendo a experincia...

149

E-Print Network 3.0 - atributos sismicos um Sample Search Results  

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

de NPCs para o Jogo Estrada Real Digital Carlcio S. Cordeiro, Carlos Augusto P. de Sousa, Diogo S. Sampaio, Luiz Gustavo Summary: aparncia como um todo, tendo em vista os...

150

UM Waste Management Services 763-5539, www.recycle.umich.edu  

E-Print Network [OSTI]

FOOD WASTE ONLY! UM Waste Management Services 763-5539, www.recycle.umich.edu YES Potatoes or RicePlain Potatoes or RicePlain Potatoes or RicePlain Potatoes or RicePlain Potatoes or Rice

Awtar, Shorya

151

LONG EXTREMAL RAYS AND SYMPLECTIC RESOLUTIONS N.I. Shepherd--Barron  

E-Print Network [OSTI]

LONG EXTREMAL RAYS AND SYMPLECTIC RESOLUTIONS N.I. Shepherd--Barron DPMMS, Cambridge University, 16 double points (RDPs) to higher dimen­ sions. 1 #12; 2 N.I. SHEPHERD--BARRON Theorem 2.1. Suppose that f components are quasi--projective. If A; B are closed subschemes of X; Y respectively, then Mor(X; Y ; A; B

Shepherd-Barron, Nick

152

Microstructural Degradation of Ni-YSZ Anodes for Solid Oxide Fuel  

E-Print Network [OSTI]

Microstructural Degradation of Ni- YSZ Anodes for Solid Oxide Fuel Cells Karl Thydén Risø-PhD-32(EN 2008 #12;Author: Karl Thydén Title: Microstructural Degradation of Ni-YSZ Anodes for Solid Oxide Fuel Cells Department: Fuel Cells and Solid State Chemistry Department Risø-PhD-32(EN) March 2008 This thesis

153

Characterization of the Ni-Cr Alloy Prepared by Laser Cladding Method  

Science Journals Connector (OSTI)

The laser cladding Ni-Cr alloy was prepared by adding nickel coated chromium composite powders on the surface of 45 steel using the laser cladding method. The component and microstructure were investigated by EDS, SEM, and HRTEM. The results show that ... Keywords: Ni-Cr alloy, laser cladding, characterization

Rui Yang; Dongjian Gao; Zhijia Qu

2012-07-01T23:59:59.000Z

154

Glass Forming Ability in Pr-(Cu, Ni)-Al Alloys  

E-Print Network [OSTI]

Glass forming ability (GFA) in the Pr-rich Pr-(Cu, Ni)-Al alloys at or near the eutectic points was systematically studied. It was found that the GFA in the pseudo-ternary alloys of Pr-(Cu, Ni)-Al is higher than that of ...

Zhang, Yong

155

Thermal analysis of nickel/metal (Ni/MH) hydride battery during charge cycle  

Science Journals Connector (OSTI)

A three-dimensional mathematical model containing temporal and spatial coordinates is presented for analyzing the thermal behavior and obtaining the internal temperature profile of cylindrical Ni/MH battery. This model is performed to investigate the ... Keywords: Ni/MH battery, charge, heat transfer coefficient, thermal analysis

Nabi Jahantigh; Ebrahim Afsharia

2008-02-01T23:59:59.000Z

156

Ni-dispersed fullerenes: Hydrogen storage and desorption properties Weon Ho Shin and Seong Ho Yang  

E-Print Network [OSTI]

Ni-dispersed fullerenes: Hydrogen storage and desorption properties Weon Ho Shin and Seong Ho Yang could be viable alternatives to reversible hydrogen storage. It is demonstrated that a single Ni coated-dispersed fullerenes are considered to be the novel hydrogen storage media capable of storing 6.8 wt % H2, thus

Goddard III, William A.

157

Oxygen driven reconstruction dynamics of Ni,,977... measured by time-lapse scanning tunneling microscopy  

E-Print Network [OSTI]

Oxygen driven reconstruction dynamics of Ni,,977... measured by time-lapse scanning tunneling-lapse scanning tunneling microscopy STM has been used to observe the oxygen induced reconstruction behavior of Ni for the merging of steps in the presence of small amounts of adsorbed oxygen, less than 2% of a monolayer. Point

Sibener, Steven

158

Robert S. Boyd William J. Moar The defensive function of Ni in plants  

E-Print Network [OSTI]

Robert S. Boyd á William J. Moar The defensive function of Ni in plants: response- gens (Boyd and Martens 1992). By manipulating soil metal content to produce high- and low-metal plants, Boyd and Martens (1994) demonstrated acute toxicity of high-metal leaves of the Ni hyperaccumulator Thl

Boyd, Robert S.

159

Atomic data and spectral line intensities for Ni XVII  

SciTech Connect (OSTI)

Electron impact collision strengths, energy levels, oscillator strengths, and spontaneous radiative decay rates are calculated for Ni XVII. We include in the calculations the 23 lowest configurations, corresponding to 159 fine-structure levels: 3l3l', 3l4l'', and 3s5l''', with l, l' = s, p, d, l'' = s, p, d, f, and l''' = s, p, d. Collision strengths are calculated at five incident energies for all transitions at varying energies above the threshold of each transition. One additional energy, very close to the threshold of each transition, has also been included. Calculations have been carried out using the Flexible Atomic Code in the distorted wave approximation. Additional calculations have been performed with the University College London suite of codes for comparison. Excitation rate coefficients are calculated as a function of electron temperature by assuming a Maxwellian electron velocity distribution. Using the excitation rate coefficients and the radiative transition rates of the present work, statistical equilibrium equations for level populations are solved at electron densities covering the range of 10{sup 8} - 10{sup 14} cm{sup -3} and at an electron temperature of log T{sub e}(K) = 6.5, corresponding to the maximum abundance of Ni XVII. Spectral line intensities are calculated, and their diagnostic relevance is discussed. This dataset will be made available in the next version of the CHIANTI database.

Bhatia, A.K. [NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Landi, E., E-mail: elandi@umich.ed [Naval Research Laboratory, Washington, DC 20375 (United States); University of Michigan, Ann Arbor, MI 48109 (United States)

2011-05-15T23:59:59.000Z

160

Electric Automobile Ni-MH Battery Investigation in Diverse Situations  

Science Journals Connector (OSTI)

Abstract The electronic differential system ensures the robust control of the vehicle comportment on the road. This paper focuses Ni-MH Battery controlled by Buck Boost DC-DC converter power supply for EV. Sliding mode control based on space vector modulation (SVM-SMC) is proposed to achieve the tow rear driving wheel control. The performances of the proposed strategy controller give a satisfactory simulation results. The proposed control law increases the utility EV autonomous under several speed variations. Moreover, the future industrial's vehicle must take into considerations the battery material choice into design steps. The battery material model choice is a crucial item, and thanks to an increasing emphasis on vehicle range and performance, the Ni-MH battery could become a viable candidate that's our proposal battery model in the present work, in this way the present paper show a novel strategy of electric automobile (EA) power electronics studies when the current battery take into account the impact of the sliding mode control based onspace vector machine technique in the several speed variations using the primitive battery SOC of 60% state.

Brahim Mebarki; Belkacem Draoui; Lakhdar Rahmani; Boumediène Allaoua

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

Mass Measurements of Proton-Rich Nuclei Fe-50 and Ni-54  

E-Print Network [OSTI]

, and target thicknesses determined the Q-value scales shown in Fig. 2. The resulting Q values and mass excesses (all in MeV) are Q("Fe) =-50..95+0.06, M(SOFe) =-34.48+0.06 and Q("Ni) = -50.19+0.05, M("Ni) =-39.21 +0.05, with the mass results based on a... Station, Texas 77843 {Received 6 December 1976) The reactions "Fe{'He,'He)' Fe and "Ni{'He,'He)"Ni have been observed at an incident a energy of 110 MeV. The reaction Q values are found to be Q{ Fe) = ?50.95 + 0.06 MeV and Q{' Ni) = ?50.19 + 0.05 Me...

Tribble, Robert E.; Cossairt, J. D.; May, D. P.; Kenefick, R. A.

1977-01-01T23:59:59.000Z

162

Effect of hydrogenation on magnetic and electronic behaviour of Pr-Ni  

SciTech Connect (OSTI)

Magnetic and electronic properties of PrNi and PrNi-H have been investigated by using first principles approach. The ground state of both the compounds is base-centered orthorhombic CrB structure. Calculations are performed using full potential linearized augmented plane wave plus local orbitals (FP-L/APW) method including spin-polarization within the frame work of density functional theory (DFT). The electronic exchange-correlation energy is described by generalized gradient approximation (GGA). The hydrogen stored in PrNi, i.e., PrNi-H has been studied to analyze the effective changes in magnetic moments and electronic structures in comparison to PrNi. A comparative study of the density of states in both the compounds has also been presented.

Rana, Pooja, E-mail: poojafizix@yahoo.com; Singh, Sanjay K., E-mail: poojafizix@yahoo.com; Verma, U. P., E-mail: poojafizix@yahoo.com [School of Studies in Physics, Jiwaji University, Gwalior-474011 (India)

2014-04-24T23:59:59.000Z

163

Orbital Degeneracy Removed by Charge Order in Triangular Antiferromagnet AgNiO{sub 2}  

SciTech Connect (OSTI)

We report a high-resolution neutron diffraction study on the orbitally degenerate spin-1/2 hexagonal metallic antiferromagnet AgNiO{sub 2}. A structural transition to a tripled unit cell with expanded and contracted NiO{sub 6} octahedra indicates {radical}(3)x{radical}(3) charge order on the Ni triangular lattice. This suggests charge order as a possible mechanism of lifting the orbital degeneracy in the presence of charge fluctuations, as an alternative to the more usual Jahn-Teller distortions. A novel magnetic ground state is observed at low temperatures with the electron-rich S=1 Ni sites arranged in alternating ferromagnetic rows on a triangular lattice, surrounded by a honeycomb network of nonmagnetic and metallic Ni ions. We also report first-principles band-structure calculations that explain microscopically the origin of these phenomena.

Wawrzynska, E.; Coldea, R. [H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL (United Kingdom); Wheeler, E. M. [Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom); Institute Laue-Langevin, B.P. 156, 38042 Grenoble Cedex 9 (France); Mazin, I. I.; Johannes, M. D. [Code 6393, Naval Research Laboratory, Washington, D.C. 20375 (United States); Soergel, T.; Jansen, M. [Max-Planck Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart (Germany); Ibberson, R. M.; Radaelli, P. G. [ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom)

2007-10-12T23:59:59.000Z

164

Magnetism of NiMn2O4-Fe3O4 spinel interfaces  

SciTech Connect (OSTI)

We investigate the magnetic properties of the isostructural spinel-spinel interface of NiMn{sub 2}O{sub 4}(NMO)-Fe{sub 3}O{sub 4}. Although the magnetic transition temperature of the NMO film is preserved, both bulk and interface sensitive measurements demonstrate that the interface exhibits strong interfacial magnetic coupling up to room temperature. While NMO thin films have a ferrimagnetic transition temperature of 60 K, both NiFe{sub 2}O{sub 4} and MnFe{sub 2}O{sub 4} are ferrimagnetic at room temperature. Our experimental results suggest that these magnetic properties arise from a thin interdiffused region of (Fe,Mn,Ni){sub 3}O{sub 4} at the interface, leading to Mn and Ni magnetic properties similar to those of MnFe{sub 2}O{sub 4} and NiFe{sub 2}O{sub 4}.

Arenholz, Elke; Nelson-Cheeseman, B. B.; Chopdekar, R. V.; Bettinger, J. S.; Arenholz, E.; Suzuki, Y.

2007-09-13T23:59:59.000Z

165

PII S0016-7037(99)00244-6 The role of Al in the formation of secondary Ni precipitates  

E-Print Network [OSTI]

is dissolved from the sorbent and substitutes for Ni in brucite-like hydroxide layers of the newly forming

Sparks, Donald L.

166

Microstructure and thermal conductivity of surfactant-free NiO nanostructures  

SciTech Connect (OSTI)

High purity, nanometer sized surfactant-free nickel oxide (NiO) particles were produced in gram scale using a solution combustion method and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), gas pycnometry and gas adsorption analysis (BET). The average particle size of the as-synthesized NiO increases significantly with the preheating temperature of the furnace, while the specific surface area decreases. A BET specific surface area of {approx}100 m{sup 2}/g was obtained for NiO nanoparticles with size as small as 3 nm synthesized at 300 Degree-Sign C. The thermal conductivity ({kappa}) of pressed pellets of the synthesized NiO nanoparticles obtained using spark plasma sintering (SPS) and uniaxial hot pressing is drastically decreased ({approx}60%) compared to that of NiO single crystal. This strong reduction in {kappa} with particle size suggests the suitability of the synthesized surfactant-free NiO nanoparticles for use as nanoinclusions when designing high performance materials for waste heat recovery. - Graphical abstract: Highly efficient phonon scattering by surfactant-free NiO nanostructures obtained by solution combustion of a mixture of nickel (II) nitrate hexahydrate (oxidizer) and urea (fuel) at various temperatures. Highlights: Black-Right-Pointing-Pointer Fast synthesis of surfactant-free NiO nanoparticles with controllable size. Black-Right-Pointing-Pointer High specific surface area for NiO nanoparticles with size range from 3 to 7 nm. Black-Right-Pointing-Pointer Strong reduction of the thermal conductivity with decreasing particle size. Black-Right-Pointing-Pointer NiO as nanoinclusions in high performance materials for energy conversion.

Sahoo, Pranati [Laboratory for Emerging Energy and Electronic Materials, Materials Science and Engineering Department, University of Michigan, Ann Arbor, MI 48109 (United States); Department of Chemistry, University of New Orleans, New Orleans, LA 70148 (United States); Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Misra, Dinesh K. [The Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Salvador, Jim [Chemical Sciences and Materials Systems Laboratory, General Motors R and D Center, Warren, MI 48090 (United States); Makongo, Julien P.A. [Laboratory for Emerging Energy and Electronic Materials, Materials Science and Engineering Department, University of Michigan, Ann Arbor, MI 48109 (United States); Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Chaubey, Girija S. [Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Takas, Nathan J. [Laboratory for Emerging Energy and Electronic Materials, Materials Science and Engineering Department, University of Michigan, Ann Arbor, MI 48109 (United States); Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Wiley, John B. [Department of Chemistry, University of New Orleans, New Orleans, LA 70148 (United States); Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Poudeu, Pierre F.P., E-mail: ppoudeup@umich.edu [Laboratory for Emerging Energy and Electronic Materials, Materials Science and Engineering Department, University of Michigan, Ann Arbor, MI 48109 (United States); Department of Chemistry, University of New Orleans, New Orleans, LA 70148 (United States); Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States)

2012-06-15T23:59:59.000Z

167

Development of FeNiMoB thin film materials for microfabricated magnetoelastic sensors  

SciTech Connect (OSTI)

Metglas{sup TM} 2826MB foils of 25-30 {mu}m thickness with the composition of Fe{sub 40}Ni{sub 38}Mo{sub 4}B{sub 18} have been used for magnetoelastic sensors in various applications over many years. This work is directed at the investigation of {approx}3 {mu}m thick iron-nickel-molybdenum-boron (FeNiMoB) thin films that are intended for integrated microsystems. The films are deposited on Si substrate by co-sputtering of iron-nickel (FeNi), molybdenum (Mo), and boron (B) targets. The results show that dopants of Mo and B can significantly change the microstructure and magnetic properties of FeNi materials. When FeNi is doped with only Mo its crystal structure changes from polycrystalline to amorphous with the increase of dopant concentration; the transition point is found at about 10 at. % of Mo content. A significant change in anisotropic magnetic properties of FeNi is also observed as the Mo dopant level increases. The coercivity of FeNi films doped with Mo decreases to a value less than one third of the value without dopant. Doping the FeNi with B together with Mo considerably decreases the value of coercivity and the out-of-plane magnetic anisotropy properties, and it also greatly changes the microstructure of the material. In addition, doping B to FeNiMo remarkably reduces the remanence of the material. The film material that is fabricated using an optimized process is magnetically as soft as amorphous Metglas{sup TM} 2826MB with a coercivity of less than 40 Am{sup -1}. The findings of this study provide us a better understanding of the effects of the compositions and microstructure of FeNiMoB thin film materials on their magnetic properties.

Liang Cai; Gooneratne, Chinthaka; Cha, Dongkyu; Chen Long; Kosel, Jurgen [Computer Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology, 4700 KAUST, Thuwal 23955 (Saudi Arabia); Gianchandani, Yogesh [Department of Electrical Engineering and Computer Science, 1301 Beal Ave., University of Michigan, Ann Arbor, Michigan 48109 (United States)

2012-12-01T23:59:59.000Z

168

State of Ni in catalysts for glycerol hydrogenation and methane steam reforming as studied by X-ray absorption spectroscopy  

Science Journals Connector (OSTI)

X-ray absorption spectroscopy is used to study 1% Ni/Al2O3, 5% Ni/Al2O3, and 5% Ni/TiO2 catalysts for glycerol and methane conversion. The effect of treatment in H2 under microwave irradiation on the reduction of...

O. P. Tkachenko; L. M. Kustov

2013-06-01T23:59:59.000Z

169

The interfacial reaction of Ni on (100) Si?â??xGex (x=0, 0.25) and (111) Ge  

E-Print Network [OSTI]

The interfacial reaction of Ni with Si, Si?.??Ge?.??, and Ge at 400°C has been investigated. A uniform epitaxial NiSi film was obtained at 400°C for Ni-Silicidation on Si using rapid thermal annealing method. Similarly, ...

Jin, Lijuan

170

Na, Mg, Ni and Cs distribution and speciation after long-term alteration of a simulated nuclear waste glass  

E-Print Network [OSTI]

distribution and speciation of Na, Mg, Ni and Cs in a simulated (inactive) nuclear waste glass were studied and Cs represent dose determining long-lived radionuclides (59 Ni, 135 Cs) in vitrified nuclear wasteNa, Mg, Ni and Cs distribution and speciation after long-term alteration of a simulated nuclear

171

The influence of Pt redistribution on Ni{sub 1-x}Pt{sub x}Si growth properties  

SciTech Connect (OSTI)

We have studied the influence of Pt on the growth of Ni silicide thin films by examining the Pt redistribution during silicide growth. Three different initial Pt configurations were investigated, i.e., a Pt alloy (Ni+Pt/), a Pt capping layer (Pt/Ni/) and a Pt interlayer (Ni/Pt/), all containing 7 at. % Pt relative to the Ni content. The Pt redistribution was probed using in situ real-time Rutherford backscattering spectrometry (RBS) whereas the phase sequence was monitored during the solid phase reaction (SPR) using in situ real-time x-ray diffraction. We found that the capping layer and alloy exhibit a SPR comparable to the pure Ni/ system, whereas Pt added as an interlayer has a much more drastic influence on the Ni silicide phase sequence. Nevertheless, for all initial sample configurations, Pt redistributes in an erratic way. This phenomenon can be assigned to the low solubility of Pt in Ni{sub 2}Si compared to NiSi and the high mobility of Pt in Ni{sub 2}Si compared to pure Ni. Real-time RBS further revealed that the crucial issue determining the growth properties of each silicide phase is the Pt concentration at the Si interface during the initial stages of phase formation. The formation of areas rich in Pt reduce the Ni silicide growth kinetics which influences the phase sequence and properties of the silicides.

Demeulemeester, J.; Smeets, D.; Temst, K.; Vantomme, A. [Instituut voor Kern-en Stralingsfysica and INPAC, K.U.Leuven, Celestijnenlaan 200D, B-3001 Leuven (Belgium); Comrie, C. M. [Department of Physics, University of Cape Town, Rondebosch 7700 (South Africa); Van Bockstael, C.; Knaepen, W.; Detavernier, C. [Department of Solid State Sciences, Ghent University, B-9000 Gent (Belgium)

2010-08-15T23:59:59.000Z

172

Using direct hot-rolling approach to obtain dual-phase weathering steel Cu–P–Cr–Ni–Mo  

Science Journals Connector (OSTI)

A weathering steel Cu–P–Cr–Ni–Mo has been ... based on the continuous cooling transformation diagram of weathering steel Cu–P–Cr–Ni–Mo. The results show that the microstructures of DP weathering steels Cu–P–Cr–Ni...

Chunling Zhang; Dayong Cai; Bo Liao; Yunchang Fan

2010-01-01T23:59:59.000Z

173

Mechanism(s) of Ni Sorption on Al-Hydroxy-Interlayered Vermiculite Using Time-Resolved EXAFS  

E-Print Network [OSTI]

Mechanism(s) of Ni Sorption on Al-Hydroxy-Interlayered Vermiculite Using Time-Resolved EXAFS D. R role in retaining these compounds. However, little research has been done to investigate the sorption of Ni when reacted with Al-pillared vermiculite over various times. The sorption of Ni increased when

Sparks, Donald L.

174

INFLUENCE OF GIBBSITE SURFACE AREA AND CITRATE ON Ni SORPTION MECHANISMS AT pH 7.5  

E-Print Network [OSTI]

INFLUENCE OF GIBBSITE SURFACE AREA AND CITRATE ON Ni SORPTION MECHANISMS AT pH 7.5 NORIKO U the sorption of Ni to gibbsite of two different surface areas at pH 7.5, in the presence and absence of citrate to elucidate the sorption mechanisms at the molecular level. In agreement with former results, Ni-Al layered

Sparks, Donald L.

175

Stopping and radial flow in central 58Ni+58Ni collisions between 1A and 2A GeV  

Science Journals Connector (OSTI)

The production of charged pions, protons, and deuterons has been studied in central collisions of 58Ni on 58Ni at incident beam energies of 1.06A, 1.45A, and 1.93A GeV. The dependence of transverse-momentum and rapidity spectra on the beam energy and on the centrality of the collison is presented. It is shown that the scaling of the mean rapidity shift of protons established for between 10A and 200A GeV at the Brookhaven AGS and the CERN SPS accelerators energies is valid down to 1A GeV. The degree of nuclear stopping is discussed; quantum molecular dynamics calculations reproduce the measured proton rapidity spectra for the most central events reasonably well, but do not show any sensitivity between the soft and the hard equation of state. A radial flow analysis, using the midrapidity transverse-momentum spectra, delivers freeze-out temperatures T and radial flow velocities ?r which increase with beam energy up to 2A GeV; in comparison to the existing data of Au on Au over a large range of energies, only ?r shows a system size dependence.

B. Hong et al. ((FOPI Collaboration))

1998-01-01T23:59:59.000Z

176

High Temperature Oxidation Behavior of gamma-Ni+gamma'-Ni3Al Alloys and Coatings Modified with Pt and Reactive Elements  

SciTech Connect (OSTI)

Materials for high-pressure turbine blades must be able to operate in the high-temperature gases (above 1000 C) emerging from the combustion chamber. Accordingly, the development of nickel-based superalloys has been constantly motivated by the need to have improved engine efficiency, reliability and service lifetime under the harsh conditions imposed by the turbine environment. However, the melting point of nickel (1455 C) provides a natural ceiling for the temperature capability of nickel-based superalloys. Thus, surface-engineered turbine components with modified diffusion coatings and overlay coatings are used. Theses coatings are capable of forming a compact and adherent oxide scale, which greatly impedes the further transport of reactants between the high-temperature gases and the underlying metal and thus reducing attack by the atmosphere. Typically, these coatings contain {beta}-NiAl as a principal constituent phase in order to have sufficient aluminum content to form an Al{sub 2}O{sub 3} scale at elevated temperatures. The drawbacks to the currently-used {beta}-based coatings, such as phase instabilities, associated stresses induced by such phase instabilities, and extensive coating/substrate interdiffusion, are major motivations in this study to seek next-generation coatings. The high-temperature oxidation resistance of novel Pt + Hf-modified {gamma}-Ni + {gamma}-Ni{sub 3}Al-based alloys and coatings were investigated in this study. Both early-stage and 4-days isothermal oxidation behavior of single-phase {gamma}-Ni and {gamma}{prime}-Ni{sub 3}Al alloys were assessed by examining the weight changes, oxide-scale structures, and elemental concentration profiles through the scales and subsurface alloy regions. It was found that Pt promotes Al{sub 2}O{sub 3} formation by suppressing the NiO growth on both {gamma}-Ni and {gamma}{prime}Ni{sub 3}Al single-phase alloys. This effect increases with increasing Pt content. Moreover, Pt exhibits this effect even at lower temperatures ({approx}970 C) in the very early stage of oxidation. It was also inferred that Pt enhances the diffusive flux of aluminum from the substrate to the scale/alloy interface. Relatively low levels of hafnium addition to Pt-free {gamma}{prime}-Ni{sub 3}Al increased the extent of external NiO formation due to non-protective HfO{sub 2} formation. Accordingly, this effect intensified with increasing Hf content from 0.2 to 0.5 at.%.

Nan Mu

2007-12-01T23:59:59.000Z

177

Atomic data and spectral line intensities for Ni XI  

SciTech Connect (OSTI)

Electron impact collision strengths, energy levels, oscillator strengths, and spontaneous radiative decay rates are calculated for Ni XI. We include in the calculations the 12 lowest configurations, corresponding to 180 fine-structure levels: 3s{sup 2}3p{sup 6}, s{sup 2}3p{sup 5}3d, 3s{sup 2}3p{sup 4}3d{sup 2}, 3s3p{sup 6}3d, 3s{sup 2}3p{sup 5}4l, and 3s3p{sup 6}4l with l = s, p, d, f. Collision strengths are calculated at five incident energies for all transitions: 7.45, 17.6, 31.4, 50.1, and 75.2 Ry above the threshold of each transition. An additional energy, very close to the transition threshold, has been added, whose value is between 0.0007 Ry and 0.25 Ry depending on the levels involved. Calculations have been carried out using the Flexible Atomic Code. The scattering problem is solved in the distorted wave approximation. Excitation rate coefficients are calculated as a function of electron temperature by assuming a Maxwellian electron velocity distribution. Using the excitation rate coefficients and the radiative transition rates of the present work, combined with close coupling collision excitation rate coefficients available in the literature for the lowest 17 levels, statistical equilibrium equations for level populations are solved at electron densities covering the range of 10{sup 8}-10{sup 14} cm{sup -3} and at an electron temperature of logT{sub e}K=6.1, corresponding to the maximum abundance of Ni XI. Spectral line intensities are calculated, and their diagnostic relevance is discussed. This dataset will be made available in the next version of the CHIANTI database.

Bhatia, A.K. [NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Landi, E., E-mail: Landi@nrl.navy.mi [Naval Research Laboratory, Washington, DC 20375 (United States)

2011-01-15T23:59:59.000Z

178

Atomic data and spectral line intensities for Ni XV  

SciTech Connect (OSTI)

Electron impact collision strengths, energy levels, oscillator strengths, and spontaneous radiative decay rates are calculated for Ni XV. We include in the calculations the 9 lowest configurations, corresponding to 126 fine structure levels: 3s{sup 2} 3p{sup 2}, 3s3p{sup 3}, 3s{sup 2} 3p3d, 3p{sup 4}, 3s3p{sup 2} 3d, and 3s{sup 2} 3p4l with l=,s,p,d,f. Collision strengths are calculated at five incident energies for all transitions: 7.8, 18.5, 33.5, 53.5, and 80.2 Ry above the threshold of each transition. An additional energy, very close to the transition threshold, has been added, whose value is between 0.004 and 0.28 Ry depending on the levels involved. Calculations have been carried out using the Flexible Atomic Code and the distorted-wave approximation. Excitation rate coefficients are calculated as a function of electron temperature by assuming a Maxwellian electron velocity distribution. Using the excitation rate coefficients and the radiative transition rates calculated in the present work, statistical equilibrium equations for level populations are solved at electron densities covering the 10{sup 8}-10{sup 14} cm{sup -3} range and at an electron temperature of logT{sub e}(K)=6.4, corresponding to the maximum abundance of Ni XV. Spectral line intensities are calculated, and their diagnostic relevance is discussed. This dataset will be made available in the next version of the CHIANTI database.

Landi, E., E-mail: elandi@umich.edu [Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI 48109 (United States); Bhatia, A.K. [NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States)] [NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

2012-07-15T23:59:59.000Z

179

NREL Improves Hole Transport in Sensitized CdS-NiO Nanoparticle Photocathodes (Fact Sheet)  

SciTech Connect (OSTI)

Significantly improved charge-collection efficiencies result from a general chemical approach to synthesizing photocathodes. It has been reported that a dye-sensitized nickel oxide (NiO) photocathode, when coupled to a dye-sensitized photoanode, could significantly increase overall solar conversion efficiency. However, the conversion efficiencies of these cells are still low. There has been much effort to improve the conversion efficiency by fabricating films with improved properties and developing more effective sensitizing dyes for p-type NiO. One of the factors limiting the use of NiO for solar cell application is the low hole conductivity in p-NiO. A team of researchers from the National Renewable Energy Laboratory (NREL) developed a general chemical approach to synthesize NiO-cadmium sulfide (CdS) core-shell nanoparticle films as photocathodes for p-type semiconductor-sensitized solar cells. Compared to dye-sensitized NiO photocathodes, the CdS-sensitized NiO cathodes exhibited two orders of magnitude faster hole transport (attributable to the passivation of surface traps by the CdS) and almost 100% charge-collection efficiencies.

Not Available

2012-01-01T23:59:59.000Z

180

Cysteine 295 indirectly affects Ni coordination of carbon monoxide dehydrogenase-II C-cluster  

SciTech Connect (OSTI)

Highlights: •CODH-II harbors a unique [Ni-Fe-S] cluster. •We substituted the ligand residues of Cys{sup 295} and His{sup 261}. •Dramatic decreases in Ni content upon substitutions were observed. •All substitutions did not affect Fe-S clusters assembly. •CO oxidation activity was decreased by the substitutions. -- Abstract: A unique [Ni–Fe–S] cluster (C-cluster) constitutes the active center of Ni-containing carbon monoxide dehydrogenases (CODHs). His{sup 261}, which coordinates one of the Fe atoms with Cys{sup 295}, is suggested to be the only residue required for Ni coordination in the C-cluster. To evaluate the role of Cys{sup 295}, we constructed CODH-II variants. Ala substitution for the Cys{sup 295} substitution resulted in the decrease of Ni content and didn’t result in major change of Fe content. In addition, the substitution had no effect on the ability to assemble a full complement of [Fe–S] clusters. This strongly suggests Cys{sup 295} indirectly and His{sup 261} together affect Ni-coordination in the C-cluster.

Inoue, Takahiro; Takao, Kyosuke; Yoshida, Takashi [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan)] [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan); Wada, Kei [Organization for Promotion of Tenure Track, University of Miyazaki, Miyazaki 889-1692 (Japan)] [Organization for Promotion of Tenure Track, University of Miyazaki, Miyazaki 889-1692 (Japan); Daifuku, Takashi; Yoneda, Yasuko [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan)] [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan); Fukuyama, Keiichi [Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan)] [Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan); Sako, Yoshihiko, E-mail: sako@kais.kyoto-u.ac.jp [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan)] [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan)

2013-11-08T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

NiO(111) nanosheets as efficient and recyclable adsorbents for dye pollutant removal from  

Science Journals Connector (OSTI)

Semiconductor single-crystalline polar NiO(111) nanosheets with well-defined hexagonal holes have been investigated for application in dye adsorption and combustion processes. With regard to adsorption technologies, high surface area metal oxides have an advantage over activated carbon in that the adsorbed species can be combusted and the adsorbent reused in the case of metal oxides while regeneration of activated carbon remains challenging and thus the adsorbent/adsorbate system must be disposed of. Here, three typical textile dyes, reactive brilliant red X-3B, congo red and fuchsin red, were studied for removal from wastewater with two NiO systems and activated carbon. These studies revealed that the NiO(111) nanosheets exhibited much more favorable adsorptive properties than conventionally prepared nickel oxide powder (CP-NiO) obtained from thermal decomposition of nickel nitrate. The maximum adsorption capabilities of the three dyes on NiO(111) nanosheets reached 30.4 mg g?1, 35.15 mg g?1 and 22 mg g?1 for reactive brilliant red X-3B, congo red and fuchsin acid, respectively, while the maximum adsorption capabilities of the three dyes on CP-NiO were only 8.4, 13.2 and 12 mg g?1 for reactive brilliant red X-3B, congo red and fuchsin acid. To simulate the adsorption isotherm, two commonly employed models, the Langmuir and the Freundlich isotherms, were selected to explicate the interaction of the dye and NiO(111). The isotherm evaluations revealed that the Langmuir model demonstrated better fit to experimental equilibrium data than the Freundlich model. The maximum predicted adsorption capacity was 36.1 mg g?1. In addition, adsorption kinetic data of NiO(111) followed a pseudo-second-order rate for congo red. These studies infer that NiO(111) nanosheets possess desirable properties for application in adsorption and combustion applications.

Zhi Song; Lifang Chen; Juncheng Hu; Ryan Richards

2009-01-01T23:59:59.000Z

182

Detections of water ice, hydrocarbons, and 3.3um PAH in z~2 ULIRGs  

E-Print Network [OSTI]

We present the first detections of the 3um water ice and 3.4um amorphous hydrocarbon (HAC) absorption features in z~2 ULIRGs. These are based on deep rest-frame 2-8um Spitzer IRS spectra of 11 sources selected for their appreciable silicate absorption. The HAC-to-silicate ratio for our z~2 sources is typically higher by a factor of 2-5 than that observed in the Milky Way. This HAC `excess' suggests compact nuclei with steep temperature gradients as opposed to predominantly host obscuration. Beside the above molecular absorption features, we detect the 3.3um PAH emission feature in one of our sources with three more individual spectra showing evidence for it. Stacking analysis suggests that water ice, hydrocarbons, and PAH are likely present in the bulk of this sample even when not individually detected. The most unexpected result of our study is the lack of clear detections of the 4.67um CO gas absorption feature. Only three of the sources show tentative signs of this feature and at significantly lower levels...

Sajina, A; Yan, L; Imanishi, M; Fadda, D; Elitzur, M

2009-01-01T23:59:59.000Z

183

Silicon's role in determining swelling in neutron-irradiated Fe-Cr-Ni-Si alloys  

SciTech Connect (OSTI)

Two silicon-modified alloy series, one based on Fe-15Cr-20Ni and another based on Fe-15Cr-25Ni were irradiated at target temperatures between 399 and 649{degree}C in EBR-II. The influence of silicon on swelling is more complex than previously envisioned and indicates that silicon plays two or more competing roles while in solution. Radiation-induced formation of {gamma}{prime} (Ni{sub 3}Si) precipitates is dependent on silicon and nickel content, as well as temperature. Precipitation of {gamma}{prime} appears to play only a minor role in void formation.

Sekimura, N. (Tokyo Univ., Tokai, Ibaraki (Japan)); Garner, F. A. (Pacific Northwest Lab., Richland, WA (United States)); Newkirk, J.W. (Missouri Univ., Rolla, MO (United States))

1991-11-01T23:59:59.000Z

184

Gamma-strength functions in 60Ni from two-step cascades following proton capture  

E-Print Network [OSTI]

The two-step cascade method previously used in neutron capture experiments is now applied to a proton capture reaction. The spectrum of two-step cascades populating the first 2+ level of 60Ni has been measured with 59Co(p,2gamma)60Ni reaction. The simulation technique used for the spectrum analysis allows one to reveal the range of possible shapes of both E1 and M1 gamma-strength functions. The low-energy enhancement previously observed in 3He induced reactions is seen to appear in M1 strength functions of 60Ni.

A. Voinov; S. M. Grimes; C. R. Brune; M. Guttormsen; A. C. Larsen; T. N. Massey; A. Schiller; S. Siem

2009-11-10T23:59:59.000Z

185

Significant Reduction in NiO Band Gap upon Formation of LixNi1?xO Alloys: Applications to Solar Energy Conversion  

SciTech Connect (OSTI)

Long-term sustainable solar energy conversion relies on identifying economical and versatile semiconductor materials with appropriate band structures for photovoltaic and photocatalytic applications (e.g., band gaps of ?1.5–2.0 eV). Nickel oxide (NiO) is an inexpensive yet highly promising candidate. Its charge-transfer character may lead to longer carrier lifetimes needed for higher efficiencies, and its conduction band edge is suitable for driving hydrogen evolution via water-splitting. However, NiO’s large band gap (?4 eV) severely limits its use in practical applications. Our first-principles quantum mechanics calculations show band gaps dramatically decrease to ?2.0 eV when NiO is alloyed with Li2O. We show that LixNi1?xO alloys (with x=0.125 and 0.25) are p-type semiconductors, contain states with no impurity levels in the gap and maintain NiO’s desirable charge-transfer character. Lastly, we show that the alloys have potential for photoelectrochemical applications, with band edges well-placed for photocatalytic hydrogen production and CO2 reduction, as well as in tandem dye-sensitized solar cells as a photocathode.

Alidoust, Nima; Toroker, Maytal; Keith, John A.; Carter, Emily A.

2014-01-01T23:59:59.000Z

186

Precipitation behavior of Ni-Cr-22 Fe-18 Mo (Hastelloy-X) and Ni-Cr-22 Co-12 Mo (Inconel-617) after isothermal aging  

SciTech Connect (OSTI)

The precipitation behavior of the nickel-base alloys Ni-Cr-22Fe-18Mo (Hastelloy-X) and Ni-Cr-22Co12Mo (Inconel-617) has been investigated as a function of aging temperature. Hastelloy-X shows that M/sub 6/C and TiN are primary precipitates and M/sub 12/C, A/sub 3/B/sub 2/ (approx. = Fe/sub 3/Mo/sub 2/), and M/sub 23/C/sub 6/ are secondary precipitates, while Inconel-617 also has M/sub 6/C and TiN as primary precipitates and M/sub 23/C/sub 6/, M/sub 12/C, and Ni/sub 3/AlTi as secondary precipitates. The characterization has been carried out by metallographic and transmission electron microscopy investigations and by x-ray examinations of electrochemical isolated precipitates.

Kirchhofer, H.; Nickel, H.; Schubert, F.

1984-07-01T23:59:59.000Z

187

Evaluation of Zr(Ni, Mn){sub 2} Laves phase alloys as negative active material for Ni-MH electric vehicle batteries  

SciTech Connect (OSTI)

Laves phase alloys of compositions (Zr, Ti)(Ni, Mn, M){sub x} where M = Cr, V, Co, Al, and 1.9 < x < 2.1 with hexagonal C14 or cubic C15 structure have been studied in order to select the most suitable AB{sub 2} alloys as an active material for nickel-metal hydride (Ni-MH) batteries. With the selected alloy, feasibility of MH negative electrodes using industrial technology and containing more than 97% of the alloy powder has been demonstrated. 22 Ah Ni-MH batteries for electric vehicle application have been assembled, and 600 cycles have been achieved at steady C/3 charge and discharge rates and 80% depth of discharge.

Knosp, B. [Alcatel Alsthom Recherche, Marcoussis (France); Jordy, C.; Blanchard, P. [SAFT Research Dept., Marcoussis (France); Berlureau, T. [SAFT Advanced and Industrial Battery Div., Bordeaux (France)

1998-05-01T23:59:59.000Z

188

Methane Steam Reforming Kinetics on a Ni/Mg/K/Al2O3 Catalyst  

Science Journals Connector (OSTI)

The kinetics of methane steam reforming were studied on a Ni/Mg/K/...2O3...catalyst that was developed for conditioning of biomass-derived syngas. Reactions were conducted in a packed-bed reactor while the concen...

Allison M. Robinson; Megan E. Gin; Matthew M. Yung

2013-12-01T23:59:59.000Z

189

Fabrication and characterization of porous NiTi Shape Memory Alloy by elevated pressure sintering  

E-Print Network [OSTI]

have not been adequately developed. Currently, three methods are commonly used for producing porous NiTi SMAs from elemental powders. These methods include conventional sintering, Self-propagating High-temperature Synthesis (SHS), and sintering...

Vandygriff, Eric Layton

2012-06-07T23:59:59.000Z

190

Thermomechanical Cyclic Response of TiNiPd High-Temperature Shape Memory Alloys  

E-Print Network [OSTI]

TiNiPd high-temperature shape memory alloys (HTSMAs) have attracted considerable attention as potential solid-state actuators capable of operating at temperatures up to 500 °C, exhibiting excellent corrosion resistance, adequate ductility levels...

Atli, Kadri

2012-10-19T23:59:59.000Z

191

Computational Thermodynamics of CoNiGa High Temperature Shape Memory Alloys  

E-Print Network [OSTI]

Shape Memory Alloys (SMAs) are advanced materials with interesting properties such as pseudoelasticity (PE) and the shape memory effect (SME). Recently, the CoNiGa system has emerged as the basis for very promising High Temperature Shape Memory...

Chari, Arpita

2012-10-19T23:59:59.000Z

192

Microstructure and Strengthening Mechanisms of Highly Textured Cu/Ni Multilayers  

E-Print Network [OSTI]

In this thesis, I planned to fabricate Cu/Ni metallic multilayers with equal layer thicknesses on different substrates by using magnetic sputtering technique. My objective was to characterize the texture, structure and hardness, in order to study...

Liu, Yue

2011-10-21T23:59:59.000Z

193

Roughening of the interface between grains and liquid matrix in sintered TaC-20Ni  

Science Journals Connector (OSTI)

The grains in TaC-20 wt pct Ni alloy prepared by liquidphase sintering at 1480°C have orthorhombic shapes with flat {100} faces and sharp edges. These grains show abnormal growth. When sintered at 2020°C, the gra...

Young Kyu Cho; Duk Yong Yoon; Jung Hoon Choi…

2005-09-01T23:59:59.000Z

194

Thermodynamic modeling and experimental validation of the Fe-Al-Ni-Cr-Mo alloy system  

SciTech Connect (OSTI)

NiAl-type precipitate-strengthened ferritic steels have been known as potential materials for the steam turbine applications. In this study, thermodynamic descriptions of the B2-NiAl type nano-scaled precipitates and body-centered-cubic (BCC) Fe matrix phase for four alloys based on the Fe-Al-Ni-Cr-Mo system were developed as a function of the alloy composition at the aging temperature. The calculated phase structure, composition, and volume fraction were validated by the experimental investigations using synchrotron X-ray diffraction and atom probe tomography. With the ability to accurately predict the key microstructural features related to the mechanical properties in a given alloy system, the established thermodynamic model in the current study may significantly accelerate the alloy design process of the NiAl-strengthened ferritic steels.

Teng, Zhenke [ORNL; Zhang, F [CompuTherm LLC, Madison, WI; Miller, Michael K [ORNL; Liu, Chain T [Hong Kong Polytechnic University; Huang, Shenyan [ORNL; Chou, Y.T. [Multi-Phase Services Inc., Knoxville; Tien, R [Multi-Phase Services Inc., Knoxville; Chang, Y A [ORNL; Liaw, Peter K [University of Tennessee, Knoxville (UTK)

2012-01-01T23:59:59.000Z

195

Graphene-on-Insulator Transistors Made Using C on Ni Chemical-Vapor Deposition  

E-Print Network [OSTI]

Graphene transistors are made by transferring a thin graphene film grown on Ni onto an insulating SiO[subscript 2] substrate. The properties and integration of these graphene-on-insulator transistors are presented and ...

Keast, Craig L.

196

Modeling of Chemical Looping Combustion of Methane Using a Ni-Based Oxygen Carrier  

Science Journals Connector (OSTI)

Modeling of Chemical Looping Combustion of Methane Using a Ni-Based Oxygen Carrier ... The FR and loop seal are both bubbling fluidized beds. ... Industrial & Engineering Chemistry Research (2010), 49 (21), 10200-10211 CODEN: IECRED; ISSN:0888-5885. ...

Ahmed Bougamra; Lu Huilin

2014-03-31T23:59:59.000Z

197

E-Print Network 3.0 - alloyed mg50 ni50 Sample Search Results  

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

Ti29.2Ni50.8Hf20 ... Source: Zheng, Yufeng - Department of Advanced Materials and Nanotechnology, Peking University Collection: Materials Science ; Biology and Medicine 2 J. PHYS....

198

Metallographic study of gamma - gamma prime structure in the Ni-based superalloy GTD111  

E-Print Network [OSTI]

The potential for land-based turbine buckets material rejuvenation presents a significant commercial and scientific interest. Ni-based superalloy GTD111 is used at a number of GE-manufactured power generation turbines. The ...

Kountras, Apostolos, 1970-

2004-01-01T23:59:59.000Z

199

Reaction of CO/CO2 gas mixtures on Ni–YSZ cermet electrodes  

Science Journals Connector (OSTI)

The reaction of carbon monoxide/carbon dioxide mixtures on Ni–YSZ cermet electrodes was investigated as a function of the electrode potential and the partial pressures of the reactants at 1273 K. Time-dependen...

P. Holtappels; L. G. J. De Haart; U. Stimming…

1999-05-01T23:59:59.000Z

200

E-Print Network 3.0 - ataeru eikyo ni Sample Search Results  

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

fully-periodic simulation cell. Fig... . The Ni atoms were slowly assembling to form metal clusters and were trying to find the most stable... Author: Yasushi Shibuta e-mail:...

Note: This page contains sample records for the topic "ura ni um" 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

Structural changes during the reaction of Ni thin films with (100) silicon substrates  

E-Print Network [OSTI]

thin transition metal silicide ?lms due to their ability tothe metal ?lm and the Ni concentration at the oxide/silicidemetal can di?use to the SiO 2 /Si interface and from silicide

Thron, Andrew M.; Greene, Peter K.; Liu, Kai; van Benthem, Klaus

2012-01-01T23:59:59.000Z

202

E-Print Network 3.0 - aisorui ni taisuru Sample Search Results  

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

fully-periodic simulation cell. Fig... . The Ni atoms were slowly assembling to form metal clusters and were trying to find the most stable... Author: Yasushi Shibuta e-mail:...

203

E-Print Network 3.0 - atsumitsu katei ni Sample Search Results  

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

fully-periodic simulation cell. Fig... . The Ni atoms were slowly assembling to form metal clusters and were trying to find the most stable... Author: Yasushi Shibuta e-mail:...

204

E-Print Network 3.0 - amorphous ni-ti alloys Sample Search Results  

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

044103 (6pp) doi:10.10881748-604134044103 Summary: .10881748-604134044103 Ti-TiC-TiCDLC gradient nano-composite film on a biomedical NiTi alloy Yufeng Zheng1,2, Dong...

205

Understanding and development of combined acoustic and magnetic actuation of Ni?MnGa single crystals  

E-Print Network [OSTI]

Ni-Mn-Ga based ferromagnetic shape memory alloys (FSMAs) have emerged as a promising new class of active materials capable of producing a large (several %) magnetic-field-induced strain (MFIS). FSMAs still have several ...

Techapiesancharoenkij, Ratchatee, 1979-

2007-01-01T23:59:59.000Z

206

Frequency Response of Acoustic-Assisted Ni–Mn–Ga Ferromagnetic- Shape-Memory-Alloy Actuator  

E-Print Network [OSTI]

A prototype of Ni–Mn–Ga based ferromagnetic-shape-memory-alloy (FSMA) actuator was designed and built; an acoustic-assist technique was applied to the actuator to enhance its performance. A piezoelectric stack actuator was ...

Techapiesancharoenkij, Ratchatee

207

Preliminary observations of the thermodynamic predictions of Fe-Cr-Ni alloys in coal gasifier environments  

Science Journals Connector (OSTI)

The construction of thermodynamic stability diagrams for the Fe-Cr-Ni systems is discussed. The constructed diagrams are used to predict materials behavior at coal gasifier oxygen and sulfur pote...

B. A. Gordon; V. Nagarajan

1979-04-01T23:59:59.000Z

208

Cr17Ni14Mo3 Powder Laser Cladding on 45Steel Substrate  

Science Journals Connector (OSTI)

The relationship between laser power, scan-rate, thickness of pre-placed powder particles, overlap, preheating and laser cladding coating quality was analyzed. Laser cladding of Cr17Ni14Mo3 stainless steel powder...

Sun Huilai; Lin Shuzhong; Zhao Fangfang; Qi Xiangyang

2010-01-01T23:59:59.000Z

209

Magnetism of NiMn2O4-Fe3O4 spinel interfaces  

E-Print Network [OSTI]

Magnetism of NiMn 2 O 4 –Fe 3 O 4 spinel interfaces B. B.2. Element-specific magnetism of Fe 3 O 4 /NMO interface inin these structures, 6 the magnetism near the isostructural

Nelson-Cheeseman, B. B.

2007-01-01T23:59:59.000Z

210

Hydrogen storage of multiwalled carbon nanotubes coated with Pd-Ni nanoparticles under moderate conditions  

Science Journals Connector (OSTI)

A type of novel material with a high hydrogen storage capacity was prepared by supporting PdNi18 alloy nanoparticles, which were synthesized by using a new colloid method, on the surface of pretreated multiwalled...

Jianwei Ren; Shijun Liao; Junmin Liu

2006-12-01T23:59:59.000Z

211

High-Stable Mesoporous Ni-Ce/Clay Catalysts for Syngas Production  

Science Journals Connector (OSTI)

Delaminated-clay was synthesized from a natural smectite using polyvinyl alcohol and microwaves. Ni-Ce catalysts supported on delaminated clay achieved high stability in dry reforming of methane for syngas production

Carlos Enrique Daza; Oscar A. Gamba; Yesid Hernández…

2011-07-01T23:59:59.000Z

212

Modeling and Characterization of the Magnetocaloric Effect in Ni2MnGa Materials  

SciTech Connect (OSTI)

Magnetic shape memory alloys have great promise as magneto-caloric effect refrigerant materials due to their combined magnetic and structural transitions. Computational and experimental research is reported on the Ni2MnGa material system. The magnetic states of this system have been explored using the Wang-Landau statistical approach in conjunction with the Locally Self-consistent Multiple-Scattering (LSMS) method to explore the magnetic states responsible for the magnet-caloric effect in this material. The effects of alloying agents on the transition temperatures of the Ni2MnGa alloy were investigated using differential scanning calorimetry (DSC) and superconducting quantum interference device (SQUID). Neutron scattering experiments were performed to observe the structural and magnetic phase transformations at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) on alloys of Ni-Mn-Ga and Ni-Mn-Ga-Cu-Fe. Data from the observations are discussed in comparison with the computational studies.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Rios, Orlando [ORNL; Hodges, Jason P [ORNL; Ludtka, Gerard Michael [ORNL; Porter, Wallace D [ORNL; Sefat, A. S. [Oak Ridge National Laboratory (ORNL); Rusanu, Aurelian [ORNL; Evans III, Boyd Mccutchen [ORNL

2012-01-01T23:59:59.000Z

213

Absence of long-range chemical ordering in equimolar FeCoCrNi  

SciTech Connect (OSTI)

Equimolar FeCoCrNi alloys have been the topic of recent research as 'high-entropy alloys,' where the name is derived from the high configurational entropy of mixing for a random solid solution. Despite their name, no systematic study of ordering in this alloy system has been performed to date. Here, we present results from anomalous x-ray scattering and neutron scattering on quenched and annealed samples. An alloy of FeNi{sub 3} was prepared in the same manner to act as a control. Evidence of long-range chemical ordering is clearly observed in the annealed FeNi{sub 3} sample from both experimental techniques. The FeCoCrNi sample given the same heat treatment lacks long-range chemical order.

Lucas, M. S. [Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States); UTC Inc., 1270 North Fairfield Road, Dayton, Ohio 45432 (United States); Wilks, G. B.; Senkov, O. N. [Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States); UES, Inc., 4401 Dayton-Xenia Rd., Dayton, Ohio 45432 (United States); Mauger, L.; Munoz, J. A. [California Institute of Technology, W. M. Keck Laboratory 138-78, Pasadena, California 91125 (United States); Michel, E. [Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States); Wright State University, Dayton, Ohio 45435 (United States); Horwath, J.; Semiatin, S. L. [Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States); Stone, M. B.; Abernathy, D. L. [Oak Ridge National Laboratory, 1, Bethel Valley Road, Oak Ridge, Tennessee 37831 (United States); Karapetrova, E. [Argonne National Laboratory, Argonne, Illinois 60439 (United States)

2012-06-18T23:59:59.000Z

214

Absence of long-range chemical ordering in equimolar FeCoCrNi  

SciTech Connect (OSTI)

Equimolar FeCoCrNi alloys have been the topic of recent research as high-entropy alloys, where the name is derived from the high configurational entropy of mixing for a random solid solution. Despite their name, no systematic study of ordering in this alloy system has been performed to date. Here we present results from anomalous x-ray scattering and neutron scattering on quenched and annealed samples. An alloy of FeNi3 was prepared in the same manner to act as a control. Evidence of longrange chemical ordering is clearly observed in the annealed FeNi3 sample from both experimental techniques. The FeCoCrNi sample given the same heat treatment lacks long-range chemical order.

Lucas, Matthew [Air Force Research Laboratory, Wright-Patterson AFB, OH; Wilks, G B [Air Force Research Laboratory, Wright-Patterson AFB, OH; Mauger, L [W. M. Keck Laboratory, Pasadena, CA; Munoz, Jorge A. [California Institute of Technology, Pasadena; Senkov, Oleg [ORNL; Michel, E [Air Force Research Laboratory, Wright-Patterson AFB, OH; Horwath, J [Air Force Research Laboratory, Wright-Patterson AFB, OH; Semiatin, S L [Air Force Research Laboratory, Wright-Patterson AFB, OH; Stone, Matthew B [ORNL; Abernathy, Douglas L [ORNL; Karapetrova, Evgenia [University of Illinois, Urbana-Champaign

2012-01-01T23:59:59.000Z

215

Scattering length density profile of Ni film under controlled corrosion: A study in neutron reflectometry  

Science Journals Connector (OSTI)

We report the density depth profile of an as-deposited Ni film and density profile for the same film after controlled electrochemical corrosion by chloride ions, measured by unpolarized neutron reflectometry. The...

Surendra Singh; A. K. Poswal; S. K. Ghosh; Saibal Basu

2008-11-01T23:59:59.000Z

216

Variation of electrical resistance in superelastic NiTi for sensor applications  

E-Print Network [OSTI]

Nickel-Titanium (NiTi) is a most commonly known as a heat-activated shape memory alloy. However, the material sometimes displays a constant-temperature property called "superelasticity." A superelastic material is one which ...

Russo, Analisa

2008-01-01T23:59:59.000Z

217

PVD synthesis and high-throughput property characterization of Ni?Fe?Cr alloy libraries  

SciTech Connect (OSTI)

Three methods of alloy library synthesis, thick-layer deposition followed by interdiffusion, composition-spread codeposition and electron-beam melting of thick deposited layers, have been applied to Ni-Fe-Cr ternary and Ni-Cr binary alloys. Structural XRD mapping and mechanical characterization by means of nanoindentation have been used to characterize the properties of the libraries. The library synthesis methods are compared from the point of view of the structural and mechanical information they can provide.

Rar, A.; Frafjord, J.J.; Fowlkes, Jason D.; Specht, E.D.; Rack, P.D.; Santella, M.L.; Bei, H.; George, E.P.; Pharr, G.M. (Tennessee-K); (Tennessee-K); (ORNL)

2010-11-10T23:59:59.000Z

218

Giant Ising-Type Magnetic Anisotropy in Trigonal Bipyramidal Ni(II) Complexes: Experiment and Theory  

Science Journals Connector (OSTI)

Giant Ising-Type Magnetic Anisotropy in Trigonal Bipyramidal Ni(II) Complexes: Experiment and Theory ... In the recent past, several Ni(II) mononuclear complexes presenting a large Ising-type magnetic anisotropy have been proposed. ... In order to rationalize the magnetic behavior and to get insight into the origin of the large Ising-type magnetic anisotropy experimentally observed, a full theoretical study was carried out. ...

Renaud Ruamps; Rémi Maurice; Luke Batchelor; Martial Boggio-Pasqua; Régis Guillot; Anne Laure Barra; Junjie Liu; El-Eulmi Bendeif; Sébastien Pillet; Stephen Hill; Talal Mallah; Nathalie Guihéry

2013-01-24T23:59:59.000Z

219

Mechanism for Oxygen Reduction Reaction on Pt3Ni Alloy Fuel Cell Boris V. Merinov,*,  

E-Print Network [OSTI]

, at the cathode of a polymer electrolyte membrane fuel cell (PEMFC) is a critical issue for commercial applicationMechanism for Oxygen Reduction Reaction on Pt3Ni Alloy Fuel Cell Cathode Yao Sha, Ted H. Yu, Boris of this type of fuel cells.1-4 The best current catalysts are Pt and Pt-based binary alloys, such as Pt3Ni.5

Goddard III, William A.

220

Heat treatment of NiCrFe alloy to optimize resistance to intergrannular stress corrosion  

DOE Patents [OSTI]

A process of producing a NiCrFe alloy having a high resistance to stress corrosion cracking comprising heating a NiCrFe alloy to a temperature sufficient to enable the carbon present in the alloy body in the form of carbide deposits to enter into solution, rapidly cool the alloy body, and heat the cooled body to a temperature between 1100.degree. to 1500.degree. F. for about 1 to 30 hours.

Steeves, Arthur F. (Schenectady, NY); Bibb, Albert E. (Clifton Park, NY)

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

Kinetic Isotope Effects in the N2O Decomposition over NiO  

Science Journals Connector (OSTI)

Kinetic Isotope Effects in the N2O Decomposition over NiO ... The 15N and 18O kinetic isotope effects (KIEs) in the catalytic decomposition of nitrous oxide on NiO powder were determined in the temperature range of 625?825 K, and the following temperature dependencies were found:? KIE(15N) = (0.821 ± 0.180) + (1445 ± 128)/T and KIE(18O) = (1.384 ...

Peter Žemva; Antonija Lesar; Ivan Kobal; Marjan Senega?nik

2001-04-21T23:59:59.000Z

222

Pequenas Centrais Hidroelétricas (PCH) : um estudo sobre produção e reprodução do espaço ao norte de Antioquia, Colômbia.  

E-Print Network [OSTI]

??Esta dissertação apresenta um estudo da produção do espaço concretizada pela instauração de projetos hidroelétricos, especialmente de Pequenas Centrais Hidroelétricas (PCHs), no município de Santa… (more)

John Dairo Zapata Ochoa

2013-01-01T23:59:59.000Z

223

Microstructure and mechanical properties of diffusion bonded W/steel joint using V/Ni composite interlayer  

SciTech Connect (OSTI)

Diffusion bonding between W and steel using V/Ni composite interlayer was carried out in vacuum at 1050 °C and 10 MPa for 1 h. The microstructural examination and mechanical property evaluation of the joints show that the bonding of W to steel was successful. No intermetallic compound was observed at the steel/Ni and V/W interfaces for the joints bonded. The electron probe microanalysis and X-ray diffraction analysis revealed that Ni{sub 3}V, Ni{sub 2}V, Ni{sub 2}V{sub 3} and NiV{sub 3} were formed at the Ni/V interface. The tensile strength of about 362 MPa was obtained for as-bonded W/steel joint and the failure occurred at W near the V/W interface. The nano-indentation test across the joining interfaces demonstrated the effect of solid solution strengthening and intermetallic compound formation in the diffusion zone. - Highlights: • Diffusion bonding of W to steel was realized using V/Ni composite interlayer. • The interfacial microstructure of the joint was clarified. • Several V–Ni intermetallic compounds were formed in the interface region. • The application of V/Ni composite interlayer improved the joining quality.

Liu, W.S.; Cai, Q.S., E-mail: cai2009pm@163.com; Ma, Y.Z.; Wang, Y.Y.; Liu, H.Y.; Li, D.X.

2013-12-15T23:59:59.000Z

224

Spin conversion of positronium in NiO/Al2O3 catalysts observed by coincidence Doppler broadening technique  

Science Journals Connector (OSTI)

High-purity NiO/Al2O3 catalysts were prepared by mixing NiO and ?-Al2O3 nanopowders. X-ray diffraction patterns were measured to characterize the grain size and crystalline phase of the nanopowders. Positron-annihilation spectroscopy was used to study the microstructure and surface properties of the pores inside the NiO/Al2O3 catalysts. The positron lifetime spectrum comprises two short and two long lifetime components. The two long lifetimes ?3 and ?4 correspond to ortho-positronium (o-Ps) annihilated in microvoids and large pores, respectively. With increasing NiO content in the NiO/Al2O3 catalysts, both ?4 and its intensity I4 show continuous decrease. Meanwhile, the para-positronium (p-Ps) intensity, obtained from coincidence Doppler broadening spectra, increases gradually with NiO content. The different variation in o-Ps and p-Ps intensity suggests the ortho-para conversion of positronium in NiO/Al2O3 catalysts. X-ray photoelectron spectroscopy shows that Ni mainly exists in the form of NiO. The electron-spin-resonance measurements reveal that the ortho-para conversion of Ps is induced by the unpaired electrons of the paramagnetic centers of NiO.

H. J. Zhang; Z. Q. Chen; S. J. Wang; A. Kawasuso; N. Morishita

2010-07-28T23:59:59.000Z

225

Mixed valence and spin fluctuations in Ce(Ni, Co)/sub 2/ and related systems  

SciTech Connect (OSTI)

The pseudobinary alloys Ce(Ni/sub x/Co/sub 1-x/)/sub 2/, (Ce/sub x/La/sub 1-x/)Ni/sub 2/ and (Ce/sub x/Y/sub 1-x/)Ni/sub 2/, where 0 < x < 1, were studied. The room-temperature lattice constant, the magnetic susceptibility in the 6 to 300 K temperature range, the low-temperature specific heat in the 0.4 to 25 K range, and the electrical resistivity in the 0.4 to 300 K range were measured. Additionally, x-ray absorption around the L/sub 3/ edge was studied using the synchroton radiation. Both thermodynamic and L/sub 3/ probes yield similar results for the changes of valence of Ce across these systems. It was established that Ce is in the saturated valence state in the Ce(Ni/sub x/Co/sub 1-x/)/sub 2/ for x < 0.25. The valence decreases with x in the 0.25 to 1 concentration range. Similarly, the valence of Ce decreases in the (Ce, Y)Ni/sub 2/ systems upon substitution of Y for Ce. The results obtained for the (Ce/sub x/La/sub 1-x/)Ni/sub 2/ system are interpreted in terms of changes of the Ce/sup 3 +/ impurity levels. Spin fluctuations due to the 3d electrons play an important role in these systems

Andraka, B.

1986-01-01T23:59:59.000Z

226

EFFECT OF FUEL IMPURITY ON STRUCTURAL INTEGRITY OF Ni-YSZ ANODE OF SOFCs  

SciTech Connect (OSTI)

Electricity production through the integration of coal gasification with solid oxide fuel cells (SOFCs) may potentially be an efficient technique for clean energy generation. However, multiple minor and trace components are naturally present in coals. These impurities in coal gas not only degrade the electrochemical performance of Ni-YSZ anode used in SOFCs, but also severely endanger the structural integrity of the Ni-YSZ anode. In this paper, effect of the trace impurity of the coal syngases on the mechanical degradation of Ni-YSZ anode was studied by using an integrated experimental/modeling approach. Phosphorus is taken as an example of impurity. Anode-support button cell was used to experimentally explore the migration of phosphorous impurity in the Ni-YSZ anode of SOFCs. X-ray mapping was used to show elemental distributions and new phase formation. The subsequent finite element stress analyses were conducted using the actual microstructure of the anode to illustrate the degradation mechanism. It was found that volume expansion induced by the Ni phase change produces high stress level such that local failure of the Ni-YSZ anode is possible under the operating conditions

Liu, Wenning N.; Sun, Xin; Marina, Olga A.; Pederson, Larry R.; Khaleel, Mohammad A.

2011-01-01T23:59:59.000Z

227

Metal-induced nanocrystalline structures in Ni-containing amorphous silicon thin films  

SciTech Connect (OSTI)

The mechanisms of silicon nanocrystal structure formation in amorphous Si films have been studied for a relative Ni impurity content varying between 0.1 and 10 at. %, i.e., from a Ni doping range to the Si-Ni alloy phase. The films, deposited by the cosputtering technique at 200 deg. C, were submitted to isochronal (15 min) annealing cycles up to 800 deg. C. Four different substrates were used to deposit the studied films: crystalline (c-) quartz, c-Si, c-Ge, and glass. Both the two orders of magnitude impurity concentration range variation and the very short annealing times were selected on purpose to investigate the first steps of the mechanism leading to the appearance of crystal seeds. The conclusions of this work are the following: (a) Ni impurity induces the low-temperature crystallization of amorphous silicon; (b) the NiSi{sub 2} silicide phase mediates, at the surface or in the bulk of the film, the crystallization process; and (c) the onset of crystallization and the crystalline fraction of the samples at each temperature depend not only on the Ni impurity concentration, but also on the nature of the substrate.

Ferri, F. A.; Zanatta, A. R.; Chambouleyron, I. [Instituto de Fisica de Sao Carlos-USP, Sao Carlos 13560-250, Sao Paulo (Brazil); Instituto de Fisica Gleb Wataghin-UNICAMP, Campinas 13083-970, Sao Paulo (Brazil)

2006-11-01T23:59:59.000Z

228

Molecule-substrate interaction channels of metal-phthalocyanines on graphene on Ni(111) surface  

SciTech Connect (OSTI)

Molecule-substrate interaction channels of metal-phthalocyanines (MPcs, including NiPc, CuPc, ZnPc, FePc, and CoPc) on graphene on Ni(111) were investigated by employing high-resolution electron energy loss spectroscopy (HREELS). Except the expected IR-active modes, some Raman-active modes were also observed in all of MPcs, which are considered in this study. From the origination of the Raman-active features, it was deduced that MPcs are coupled with the substrate mainly through their central metal atom. The Raman-active modes appear as symmetric peaks in the HREELS in the case of MPcs with Ni, Cu, and Zn, whereas they are asymmetric and appear as a Fano line shape in the case of MPcs with Fe and Co. This spectroscopic difference indicates that the molecule-substrate coupling is completely different in the two cases mentioned above. The molecule-substrate interaction strength is considerably weak and comparable with the {pi}-{pi} interaction between molecules in the case of MPcs with Ni, Cu, and Zn, whereas it is much stronger in the case of MPcs with Fe and Co. From the HREELS observations, it can be suggested that the whole molecule can be effectively decoupled from the underneath Ni(111) by inserting a single layer of graphene between them in the case of MPcs with Ni, Cu, and Zn, whereas only benzene rings can be completely decoupled in the case of MPcs with Fe and Co.

Dou Weidong; Huang Shuping; Zhang, R. Q.; Lee, C. S. [Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong (Hong Kong)

2011-03-07T23:59:59.000Z

229

Dielectric property of NiTiO{sub 3} doped substituted ortho-chloropolyaniline composites  

SciTech Connect (OSTI)

Ortho-chloropolyaniline (OCP)-NiTiO{sub 3} composites have been synthesized via in-situ polymerization of ortho-chloroaniline with various weight percentages of NiTiO{sub 3.} Fourier Transform Infrared spectroscopic studies of Ortho-chloropolyaniline and its composites indicated the formation of composites as a result of Vander Waal's interaction between OCP and NiTiO{sub 3} particles. Surface morphology of OCP and OCP-NiTiO{sub 3} composites were studied using Scanning Electron Microscope (SEM). The SEM micrographs indicated a modified morphology after the composite formation. Dielectric properties and electric modulus of OCP and OCP-NiTiO{sub 3} composites have been investigated in the frequency range of 50 Hz – 5 MHz. It has been noticed that electrical resistance decreases with increase in weight percentage of NiTiO{sub 3} particles in polymer matrix as well as with applied frequency. The display of semicircular arcs in Cole-Cole plots indicates the formation of series resistor and capacitor in network causing a decrease in the relaxation time and as a result conductivity enhances in these composites. The facile and cost effective synthesis process and excellent dielectric and conductivity response of these materials makes them promising materials for practical applications.

Lakshmi, Mohana; Faisal, Muhammad [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India)] [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India); Roy, Aashish S. [Department of Materials Science, Gulbarga University, Gulbarga-585106, Karnataka (India)] [Department of Materials Science, Gulbarga University, Gulbarga-585106, Karnataka (India); Khasim, Syed, E-mail: syed.pes@gmail.com [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India) [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India); Department of Physics, University of Tabuk-71491 (Saudi Arabia); Sajjan, K. C. [Department of Physics, Veerashaiva College, Bellary - 583 104, Karnataka (India)] [Department of Physics, Veerashaiva College, Bellary - 583 104, Karnataka (India); Revanasiddappa, M. [Department of Chemistry, PES Institute of Technology, BSC, Bangalore - 560100 (India)] [Department of Chemistry, PES Institute of Technology, BSC, Bangalore - 560100 (India)

2013-11-15T23:59:59.000Z

230

Electrochemical Testing of Ni-Cr-Mo-Gd Alloys  

SciTech Connect (OSTI)

The waste package site recommendation design specified a boron-containing stainless steel, Neutronit 976/978, for fabrication of the internal baskets that will be used as a corrosion-resistant neutron-absorbing material. Recent corrosion test results gave higher-than-expected corrosion rates for this material. The material callout for these components has been changed to a Ni-Cr-Mo-Gd alloy (ASTM-B 932-04, UNS N06464) that is being developed at the Idaho National Laboratory. This report discusses the results of initial corrosion testing of this material in simulated in-package environments that could contact the fuel baskets after breach of the waste package outer barrier. The corrosion test matrix was executed using the potentiodynamic and potentiostatic electrochemical test techniques. The alloy performance shows low rates of general corrosion after initial removal of a gadolinium-rich second phase that intersects the surface. The high halide-containing test solutions exhibited greater tendencies toward initiation of crevice corrosion.

T. E. Lister; R. E. Mizia; H. Tian

2005-10-01T23:59:59.000Z

231

Metallic glass alloys of Zr, Ti, Cu and Ni  

DOE Patents [OSTI]

At least quaternary alloys form metallic glass upon cooling below the glass transition temperature at a rate less than 10.sup.3 K/s. Such alloys comprise titanium from 19 to 41 atomic percent, an early transition metal (ETM) from 4 to 21 atomic percent and copper plus a late transition metal (LTM) from 49 to 64 atomic percent. The ETM comprises zirconium and/or hafnium. The LTM comprises cobalt and/or nickel. The composition is further constrained such that the product of the copper plus LTM times the atomic proportion of LTM relative to the copper is from 2 to 14. The atomic percentage of ETM is less than 10 when the atomic percentage of titanium is as high as 41, and may be as large as 21 when the atomic percentage of titanium is as low as 24. Furthermore, when the total of copper and LTM are low, the amount of LTM present must be further limited. Another group of glass forming alloys has the formula (ETM.sub.1-x Ti.sub.x).sub.a Cu.sub.b (Ni.sub.1-y Co.sub.y).sub.c wherein x is from 0.1 to 0.3, y.cndot.c is from 0 to 18, a is from 47 to 67, b is from 8 to 42, and c is from 4 to 37. This definition of the alloys has additional constraints on the range of copper content, b.

Lin, Xianghong (Pasadena, CA); Peker, Atakan (Pasadena, CA); Johnson, William L. (Pasadena, CA)

1997-01-01T23:59:59.000Z

232

Ag{sub 3}Ni{sub 2}O{sub 4}-A new stage-2 intercalation compound of 2H-AgNiO{sub 2} and physical properties of 2H-AgNiO{sub 2} above ambient temperature  

SciTech Connect (OSTI)

Ag{sub 3}Ni{sub 2}O{sub 4} was obtained as single crystals from a mixture of 2H-AgNiO{sub 2} and Ag{sub 2}O in oxygen high-pressure autoclaves (P6{sub 3}/mmc (no. 194), a=2.9331(6), c=28.313(9)A, Z=2). It may be regarded as a stage-2 intercalation compound of the host 2H-AgNiO{sub 2} and is the first staging compound constituted of alternating subvalent {approx}2Ag{sub 2}{sup +} and Ag{sup +} sheets, inserted between NiO{sub 2}{sup -} slabs. From a structural point of view, Ag{sub 3}Ni{sub 2}O{sub 4} represents an intermediate between AgNiO{sub 2} and the recently reported Ag{sub 2}NiO{sub 2}. The electronic structures of 2H-AgNiO{sub 2} and Ag{sub 3}Ni{sub 2}O{sub 4} have been investigated based on DFT band structure calculations. The high-temperature characteristics of the starting material 2H-AgNiO{sub 2} were investigated. The inverse magnetic susceptibility, electrical resistivity and differential scanning calorimetry (DSC) show a phase transition in the temperature range of T=320-365K.

Soergel, Timo [Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, 70569 Stuttgart (Germany); Jansen, Martin [Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, 70569 Stuttgart (Germany)], E-mail: m.jansen@fkf.mpg.de

2007-01-15T23:59:59.000Z

233

Adaptação contextualizada do conteúdo da interface de um jogo narrativo educacional  

Science Journals Connector (OSTI)

Este artigo apresenta um jogo narrativo educacional que possui a interface adaptativa com o intuito de permitir a qualquer educador(a) adaptar o conteúdo da interface com auxílio de sugestões advindas de uma base cultural, que possui ... Keywords: estudo de caso, interface adaptativa, jogos narrativos

Marcos Alexandre Rose Silva; Junia Coutinho Anacleto

2011-10-01T23:59:59.000Z

234

DOE External Advisory Mee4ng: Dec, 2013 Atlan&c Offshore Wind Consor&um  

E-Print Network [OSTI]

1 DOE External Advisory Mee4ng: Dec, 2013 Atlan&c Offshore Wind Consor&um Assessing Tribological Aspects of Gearbox Reliability in Wind Turbines David L the effects of wind-specific factors on gearbox reliability 2) Iden&fy design solu

Firestone, Jeremy

235

Influence of implantation induced Ni-doping on structural, optical, and morphological properties of nanocrystalline CdS thin films  

Science Journals Connector (OSTI)

Ni-doped CdS thin films were prepared by 90 keV Ni+ implantation at room temperature. Ni-ion implantation induced modifications in structural, optical, and morphological properties are studied for a wide range of impurity concentrations (1.86–10.19 at.%). Addition of Ni+ ions does not lead to any structural phase transformation or formation of metallic clusters or secondary phase precipitates. However, it induces structural disorder leading to a reduction in the optical band gap from 2.39 to 2.28 eV following Ni implantation up to 3 × 1016 ions cm?2. This is addressed on the basis of band tailing due to the creation of localized energy states and implantation induced grain growth. Moreover, Ni-doping is found to modify the luminescence properties by creating shallow acceptor states.

S. Chandramohan; T. Strache; S.N. Sarangi; R. Sathyamoorthy; T. Som

2010-01-01T23:59:59.000Z

236

Epitaxial growth of CdTe thin film on cube-textured Ni by metal-organic chemical vapor deposition  

SciTech Connect (OSTI)

CdTe thin film has been grown by metalorganic chemical vapor deposition (MOCVD) on Ni(100) substrate. Using x-ray pole figure measurements we observed the epitaxial relationship of {111}CdTe// {001}Ni with [110]CdTe//[010]Ni and [112] CdTe//[100]Ni. The 12 diffraction peaks in the (111) pole figure of CdTe film and their relative positions with respect to the four peak positions in the (111) pole figure of Ni substrate are consistent with four equivalent orientational domains of CdTe with three to four superlattice match of about 0.7% in the [110] direction of CdTe and the [010] direction of Ni. The electron backscattered diffraction (EBSD) images show that the CdTe domains are 30 degrees orientated from each other.

GIARE, C [Rensselaer Polytechnic Institute (RPI); RAO, S [Rensselaer Polytechnic Institute (RPI); RILEY, M [Rensselaer Polytechnic Institute (RPI); CHEN, L [Rensselaer Polytechnic Institute (RPI); Goyal, Amit [ORNL; BHAT, I [Rensselaer Polytechnic Institute (RPI); LU, T [Rensselaer Polytechnic Institute (RPI); WANG, G [Rensselaer Polytechnic Institute (RPI)

2012-01-01T23:59:59.000Z

237

Symmetry energy and the isoscaling properties of the fragments in multifragmentation of 40Ca+58Ni, 40Ar+58Ni, and 40Ar+58Fe reactions  

E-Print Network [OSTI]

The symmetry energy and the isoscaling properties of the fragments produced in multifragmentation of 40Ar, 40Ca + 58Fe, 58Ni reactions at 25, 33, 45 and 53 MeV/nucleon were investigated within the framework of a statistical multifragmentation model...

Iglio, Jennifer Ann

2007-09-17T23:59:59.000Z

238

2010 National Instruments. All rights reserved. Visit ni.com/legal. For patents see ni.com/patents. National Instruments LabVIEW Boot Camp at  

E-Print Network [OSTI]

.com/patents. National Instruments LabVIEW Boot Camp at Arizona State University June 16 - 19, 2014 8:00 AM - 5:00 PM Each day Memorial Union - Cochise & Union Stage Register today to attend our upcoming NI LabVIEW Boot

Reisslein, Martin

239

Local structure of amorphous \\{MO50Ni50\\} determined by anomalous x-ray scattering using synchroton radiation  

Science Journals Connector (OSTI)

Anomalous (resonance) x-ray scattering technique using synchrotron radiation was applied to determine the compositionally resolved local structure of sputter deposited amorphous Mo50Ni50. The local environments of Mo atoms and Ni atoms were found to be significantly different from each other, but similar to the corresponding local environments in crystalline MoNi. The results compare favorably with those of the EXAFS measurement.

S. Aur; D. Kofalt; Y. Waseda; T. Egami; R. Wang; H.S. Chen; Boon-Keng Teo

1983-01-01T23:59:59.000Z

240

Generation of a Doubly Bridging CO2 Ligand and Deoxygenation of CO2 by an (NHC)Ni(0) Complex  

E-Print Network [OSTI]

for CO2, µ-2,2-CO2, at a dinickel core. The reaction of [(IPr)Ni(µ-Cl)]2 18 (IPr ) 1,3-bis(2,6-diisopro, (IPr)- Ni(6-C6D6). We note that this symmetric pattern for the backbone protons is observed in reacted isolation of the product as a solid. Reaction of [(IPr)Ni(µ-Cl)]2 with Li(HBEt3) or with NaOt-Bu followed

Müller, Peter

Note: This page contains sample records for the topic "ura ni um" 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

Hydrogen Insertion Effects on the Electronic Structure of Equiatomic MgNi Traced by ab initio Calculations.  

E-Print Network [OSTI]

1 Hydrogen Insertion Effects on the Electronic Structure of Equiatomic MgNi Traced by ab initio-xxx / Received October 18, 2012. Doi: 10.5560/ ZNB.2012-xxx For equiatomic MgNi which can be hydrogenated up to the composition MgNiH1.6 at an absorption/desorption temperature of 200 °C, the effects of hydrogen are approached

Paris-Sud XI, Université de

242

On the development of high quality NiTi shape memory and pseudoelastic parts by additive manufacturing  

Science Journals Connector (OSTI)

Additive manufacturing provides an attractive processing method for nickel?titanium (NiTi) shape memory and pseudoelastic parts. In this paper, we show how the additive manufacturing process affects structural and functional properties of additively manufactured NiTi and how the process parameter set-up can be optimized to produce high quality NiTi parts and components. Comparisons of shape recovery due to shape memory and pseudoelasticity in additively manufactured and commercial NiTi exhibit promising potential for this innovative processing method.

Christoph Haberland; Mohammad Elahinia; Jason M Walker; Horst Meier; Jan Frenzel

2014-01-01T23:59:59.000Z

243

Construction of the Magnetic Phase Diagram of FeMn/Ni/Cu(001) Using Photoemission Electron Microscopy  

SciTech Connect (OSTI)

Single crystalline FeMn/Ni bilayer was epitaxially grown on Cu(001) substrate and investigated by photoemission electron microscopy (PEEM). The FeMn and Ni films were grown into two cross wedges to facilitate an independent control of the FeMn (0-20 ML) and Ni (0-20 ML) film thicknesses. The Ni magnetic phases were determined by Ni domain images as a function of the Ni thickness (d{sub Ni}) and the FeMn thickness (d{sub FeMn}). The result shows that as the Ni thickness increases, the Ni film undergoes a paramagnetic-to-ferromagnetic state transition at a critical thickness of d{sub FM} and an in-plane to out-of-plane spin reorientation transition at a thicker thickness d{sub SRT}. The phase diagram shows that both d{sub FM} and d{sub SRT} increase as the FeMn film establishes its antiferromagnetic order.

Wu, J.; Scholl, A.; Arenholz, E.; Hwang, C.; Qiu, Z. Q.

2011-01-04T23:59:59.000Z

244

Nyhetsbrev frn teckensprksavdelningen, v6 2013 Om ni inte hade mjlighet att vara med p symposiet "Perspektiv p dvas  

E-Print Network [OSTI]

1 (1) Nyhetsbrev från teckenspråksavdelningen, v6 2013 Om ni inte hade möjlighet att vara med på

245

Conceptual design of a Ni-based chemical looping combustion process using fixed-beds  

Science Journals Connector (OSTI)

Abstract This work presents a comprehensive conceptual design of a Ni-based chemical looping combustion process (CLC) carried out in fixed bed reactors. The process is intended to exploit the well-known advantages of the Ni/NiO redox system for CLC applications in terms of high reactivity, O2 carrying capacity and chemical and thermal stability. Solutions to the problem of heat management in fixed bed reactors at high temperature and high pressure are described, while a continuous flow of nitrogen for driving a gas turbine is produced. Each reactor involved in the process goes through a cyclic sequence of five reaction and heat transfer stages. Cool product gas recirculations are incorporated into the Ni oxidation and NiO reduction stages in order to moderate the maximum temperatures in the beds and control the displacement of the reaction and heat transfer fronts. A preliminary conceptual design of the process has been carried out to determine the minimum number of reactors needed for continuous operation in typical large-scale CO2 capture systems. Basic reactor models and assumptions based on an ideal plug flow pattern have been used in all the reactors during the chemical reactions and the heat transfer operations. This has made it possible to identify reasonable operating windows for the eight fixed-bed reactors that make up the CO2 capture system, and has demonstrated not only its technical viability but also its great potential for further development.

J.R. Fernández; J.C. Abanades

2014-01-01T23:59:59.000Z

246

Spillover sites on a 19% Ni/Al sub 2 O sub 3 catalyst  

SciTech Connect (OSTI)

Two distinct methanation sites are clearly identified on a 19% Ni/Al{sub 2}O{sub 3} catalyst by temperature-programmed reaction (TPR) employing isotope labeling. The two sites, which are present after reduction at 975 K, are due to CO adsorption on Ni crystallites and CO and H spillover onto the Al{sub 2}O{sub 3} support. The concentration of sites on the support is 250 {mu}mol/G Al{sub 2}O{sub 3} (5 {times} 10{sup 13} molecules/cm{sup 2}), which is the same value measured for a 5.1% Ni/Al{sub 2}O{sub 3} catalyst and for a 1.0% Ru/Al{sub 2}O{sub 3} catalyst. Temperature-programmed desorption suggest that the CO and H on the Al{sub 2}O{sub 3} are in the form of a H-CO complex. The formation of this complex is an activated process, which is related to the activated adsorption of H{sub 2}. The H{sub 2} that adsorbs between 300 and 385 K is responsible for this spillover process onto the Al{sub 2}O{sub 3}. Isotope labeling and TPR were used to verify that a H-CO complex does not form on Ni/SiO{sub 2} catalysts. Carbon monoxide adsorption on Ni/SiO{sub 2} was not activated and only one methanation site was seen.

Sen, B.; Falconer, J.L. (Univ. of Colorado, Boulder (USA))

1989-06-01T23:59:59.000Z

247

Microsoft PowerPoint - UM_ARM2007_eps.ppt  

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

Scattering Scattering Properties of Aggregates of Plates from TWP-ICE Junshik Um and Greg M. McFarquhar University of Illinois, Urbana IL junum@atmos.uiuc.edu 1. Introduction During the 2006 Tropical Warm Pool International Cloud Experiment (TWP-ICE), aggregates of bullet rosettes (Um and McFarquhar 2007) and chain aggregates of plates were observed using a Cloud Particle Imager (CPI). Aggregates of plates were also observed during previous field campaigns (i.e., TEFLUN-B, CRYSTAL-FACE, and EMERALD-II). Many aggregates consisted of clusters of 2 or more plates attached together. Here the single-scattering properties (i.e., asymmetry parameter g and scattering phase function P 11 ) for idealized models describing these aggregates are calculated using a ray-tracing code at solar wavelength (λ=0.55μm). The relation

248

Um novo paradigma na medicina DESENVOLVEU UMA METODOLOGIA DISRUPTIVA BASEADA NA INTEGRAO DE AVANADAS TECNOLOGIAS  

E-Print Network [OSTI]

Um novo paradigma na medicina do coração DESENVOLVEU UMA METODOLOGIA DISRUPTIVA BASEADA NA M�DICOS A MELHORAR DIAGN�STICOS NA MEDICINA DO CORA��O. #12;Depois do aperfeiçoamento das tecnologias pa medicina. A utilização dos resultados da genéti- ca como meio auxiliar de diagnóstico clínico é já uma

Instituto de Sistemas e Robotica

249

Effect of Ni/Al atomic ratio of mesoporous Ni–Al2O3 aerogel catalysts on their catalytic activity for hydrogen production by steam reforming of liquefied natural gas (LNG)  

Science Journals Connector (OSTI)

Mesoporous Ni–Al2O3 (XNiAE) aerogel catalysts with different Ni/Al atomic ratio (X) were prepared by a single-step sol-gel method and a subsequent CO2 supercritical drying method. The effect of Ni/Al atomic ratio of mesoporous \\{XNiAE\\} aerogel catalysts on their physicochemical properties and catalytic activity for steam reforming of liquefied natural gas (LNG) was investigated. Textural properties and chemical properties of \\{XNiAE\\} catalysts were strongly influenced by Ni/Al atomic ratio. Nickel species were highly dispersed on the surface of \\{XNiAE\\} catalysts through the formation of surface nickel aluminate phase. In the steam reforming of LNG, both LNG conversion and hydrogen yield showed volcano-shaped curves with respect to Ni/Al atomic ratio. Average nickel diameter of \\{XNiAl\\} catalysts was well correlated with LNG conversion and hydrogen yield over the catalysts. Among the catalysts tested, 0.35NiAE (Ni/Al = 0.35) catalyst with the smallest average nickel diameter showed the best catalytic performance. The highest surface area, the largest pore volume, the largest average pore size, and the highest reducibility of 0.35NiAE catalyst were also partly responsible for its superior catalytic performance.

Jeong Gil Seo; Min Hye Youn; Yongju Bang; In Kyu Song

2010-01-01T23:59:59.000Z

250

Catalytic performances of Ni–CaO–mayenite in CO2 sorption enhanced steam methane reforming  

Science Journals Connector (OSTI)

Abstract Ni–CaO–mayenite (Ca12Al14O33) catalysts for the CO2 Sorption Enhanced Steam Methane Reforming (SE-SMR) have been developed using the microwave assisted self-combustion method of preparation. The sorption of CO2 by CaO shifts the steam reforming and the Water Gas Shift reaction (WGS) towards H2 production and favors the heat balance of the global reaction. The CO2 sorption has been studied on materials with different CaO/Ca12Al14O33 ratios and for different types of preparation. The specific surface area of materials, the temperature of Ni phases' reducibility and CO2 sorption are all essential for material efficiency. The Ni–CA75MM catalyst was the most active and stable in methane steam reforming with CO2 sorption, even at an unusually low temperature (650 °C).

Moisés R. Cesário; Braúlio S. Barros; Claire Courson; Dulce M.A. Melo; Alain Kiennemann

2015-01-01T23:59:59.000Z

251

Electronic structure of BaNi2P2 observed by angle-resolved photoemission spectroscopy  

Science Journals Connector (OSTI)

We have performed an angle-resolved photoemission spectroscopy (ARPES) study of BaNi2P2 that shows a superconducting transition at Tc ? 2.5 K. We observed hole and electron Fermi surfaces (FSs) around the Brillouin zone center and corner, respectively, and the shapes of the hole FSs dramatically changed with photon energy, indicating strong three dimensionality. The observed FSs are consistent with band-structure calculations and de Haas-van Alphen measurements. The mass enhancement factors estimated in the normal state were m*/mb ? 2, indicating weak electron correlation compared to typical iron-pnictide superconductors. An electronlike Fermi surface around the Z point was observed in contrast with BaNi2As2 and may be related to the higher Tc of BaNi2P2.

S. Ideta; T. Yoshida; M. Nakajima; W. Malaeb; H. Kito; H. Eisaki; A. Iyo; Y. Tomioka; T. Ito; K. Kihou; C. H. Lee; Y. Kotani; K. Ono; S. K. Mo; Z. Hussain; Z.-X. Shen; H. Harima; S. Uchida; A. Fujimori

2014-05-28T23:59:59.000Z

252

Field dependence of the superconducting basal plane anisotropy of TmNi2B2C  

SciTech Connect (OSTI)

The superconductor TmNi2B2C possesses a significant fourfold basal plane anisotropy, leading to a square vortex lattice (VL) at intermediate fields. However, unlike other members of the borocarbide superconductors, the anisotropy in TmNi2B2C appears to decrease with increasing field, evident by a reentrance of the square VL phase. We have used small-angle neutron scattering measurements of the VL to study the field dependence of the anisotropy. Our results provide a direct, quantitative measurement of the decreasing anisotropy. We attribute this reduction of the basal plane anisotropy to the strong Pauli paramagnetic effects observed in TmNi2B2C and the resulting expansion of vortex cores near Hc2.

Das, P.; Densmore, J.M.; Rastovski, C.; Schlesinger, K.J.; Laver, M.; Dewhurst, C.D.; Littrell, K.; Budko, Serguei L.; Canfield, Paul C.; Eskildsen, M.R.

2012-10-01T23:59:59.000Z

253

Interactions of oxygen and ethylenewith submonolayer Ag filmssupported on Ni(111)  

SciTech Connect (OSTI)

We investigate the oxidation of, and the reaction of ethylene with, Ni(111) with and without sub-monolayer Ag adlayers as a function of temperature. The addition of Ag to Ni(111) is shown to enhance the activity towards the ethylene epoxidation reaction, and increase the temperature at which ethylene oxide is stable on the surface. We present a systematic study of the formation of chemisorbed oxygen on the Ag Ni(111) surfaces and correlate the presence and absence of O1 and O2 surface species with the reactivity towards ethylene. By characterizing the samples with low-energy electron microscopy (LEEM) in combination with X-ray photoelectron spectroscopy (XPS), we have identified specific growth of silver on step-edge sites and successfully increased the temperature at which the produced ethylene oxide remains stable, a trait which is desirable for catalysis.

Rettew, Robert [Georgia Institute of Technology; Meyer, Axel [ORNL; Senanayake, Sanjaya D [ORNL; Chen, Tsung-Liang [ORNL; Petersburg, Cole [Georgia Institute of Technology; Flege, J. Ingo [University of Bremen, Bremen, Germany; Falta, Jens [University of Bremen, Bremen, Germany; Alamgir, Faisal [ORNL

2011-01-01T23:59:59.000Z

254

Interactions of Oxygen and Ethylene with Submonolayer Ag Films Supported on Ni(111)  

SciTech Connect (OSTI)

We investigate the oxidation of, and the reaction of ethylene with, Ni(111) with and without sub-monolayer Ag adlayers as a function of temperature. The addition of Ag to Ni(111) is shown to enhance the activity towards the ethylene epoxidation reaction, and increase the temperature at which ethylene oxide is stable on the surface. We present a systematic study of the formation of chemisorbed oxygen on the Ag-Ni(111) surfaces and correlate the presence and absence of O{sup 1-} and O{sup 2-} surface species with the reactivity towards ethylene. By characterizing the samples with low-energy electron microscopy (LEEM) in combination with X-ray photoelectron spectroscopy (XPS), we have identified specific growth of silver on step-edge sites and successfully increased the temperature at which the produced ethylene oxide remains stable, a trait which is desirable for catalysis.

Alamgir, F.M.; Senanayake, S.; Rettew, R.E.; Meyer, A.; Chen, T.-L.; Petersburg, C.; Flege, J.I.; Falta, J.

2011-06-01T23:59:59.000Z

255

Interactions of Oxygen and Ethylene with Submonolayer Ag Films Supported on Ni(111)  

SciTech Connect (OSTI)

We investigate the oxidation of, and the reaction of ethylene with, Ni(111) with and without sub-monolayer Ag adlayers as a function of temperature. The addition of Ag to Ni(111) is shown to enhance the activity towards the ethylene epoxidation reaction, and increase the temperature at which ethylene oxide is stable on the surface. We present a systematic study of the formation of chemisorbed oxygen on the Ag-Ni(111) surfaces and correlate the presence and absence of O{sup 1-} and O{sup 2-} surface species with the reactivity towards ethylene. By characterizing the samples with low-energy electron microscopy (LEEM) in combination with X-ray photoelectron spectroscopy (XPS), we have identified specific growth of silver on step-edge sites and successfully increased the temperature at which the produced ethylene oxide remains stable, a trait which is desirable for catalysis.

R Rettew; A Meyer; S Senanayake; T Chen; C Petersburg; J Flege; J Falta; F Alamgir

2011-12-31T23:59:59.000Z

256

Study of 3D Laser Cladding for Ni85Al15 Superalloy  

Science Journals Connector (OSTI)

Abstract Conditions of successful3D laser cladding for Ni based superalloy were studied. A high power Yb-YAG laser was used to create a molten pool on a stainless steel substrate into which Ni85Al15 powder stream was delivered to create 3D samples. The effect of different laser parameters on the structure and the intermetallic phase content of the manufactured samples were explored by optical metallography, microhardness, SEM, X-ray, and EDX analysis. The cladding of the Ni3A1 coating with small dilution into substrate can be obtained at the appropriate power density of about 2-8 J/mm2 under the laser scan velocity of 100-200 mm/min and the powder feed rate ? 3.8 g/min.

D. Kotoban; S. Grigoriev; I. Shishkovsky

2014-01-01T23:59:59.000Z

257

Quantum confinement induced magnetism in LaNiO3-LaMnO3 superlattices  

SciTech Connect (OSTI)

The emergence of magnetic reconstructions at the interfaces of oxide heterostructures are often explained via subtle modifications in the electronic densities, exchange couplings, or strain. Here, an additional possible route for induced magnetism is studied in the context of the (LaNiO3)n/(LaMnO3)n superlattices using a hybrid tightbinding model. In the LaNiO3 region, the induced magnetizations decouple from the intensity of charge leakage from Mn to Ni, but originate from the spin-filtered quantum confinement present in these nanostructures. In general, the induced magnetization is the largest for the (111)-stacking and the weakest for the (001)-stacking superlattices; results compatible with the exchange bias effects reported byGibert et al. [Nat.Mater. 11, 195 (2012)].

Dong, Shuai [ORNL; Dagotto, Elbio R [ORNL

2013-01-01T23:59:59.000Z

258

Fabrication of Ni-shims using UV-moulding as an intermediate step  

Science Journals Connector (OSTI)

We fabricated nickel-shims including various types of structures with dimensions from hundreds of nanometers to several microns. The mastering process was made by electron-beam lithography, lift-off and reactive ion etching techniques. Then the structures were copied into a UV-curable ORMOCER-material and the Ni-shims were fabricated by electroforming using UV-copies as masters. The experiments showed that the use of UV-copying evades typical quartz master sticking and cracking problems. Furthermore, all features were replicated in the final Ni-shim as they existed in the quartz master proving the method suitable for the fabrication of the Ni-shims from the quartz masters with high precision.

Juha Pietarinen; Samuli Siitonen; Noora Tossavainen; Janne Laukkanen; Markku Kuittinen

2006-01-01T23:59:59.000Z

259

Electrical properties of the amorphous interfacial layer between Al electrodes and epitaxial NiO films  

SciTech Connect (OSTI)

The amorphous interfacial layer (a-IL) between Al electrode and epitaxial NiO films were studied using electron energy-loss spectroscopy (EELS) and energy-dispersive x-ray spectroscopy. Two distinct properties were found in the a-IL, i.e., a lower metallic and an upper insulating layer. EELS results revealed that the metallic Ni atoms were responsible for the conducting nature of the lower oxide amorphous layer. The resistance behavior of Al/a-IL/epi-NiO was changed from a high to a low resistance state after forming process. The resistance change could be explained by the formation of a nanocrystalline metal alloy in the insulating amorphous layer.

Hyuck Jang, Jae; Kwon, Ji-Hwan; Kim, Miyoung [Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of); Ran Lee, Seung; Char, Kookrin [Department of Physics and Astronomy and Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-747 (Korea, Republic of)

2012-04-23T23:59:59.000Z

260

[TiII] and [NiII] emission from the strontium filament of eta Carinae  

E-Print Network [OSTI]

We study the nature of the [TiII] and [NiII] emission from the so-called strontium filament found in the ejecta of eta Carinae. To this purpose we employ multilevel models of the TiII and NiII systems which are used to investigate the physical condition of the filament and the excitation mechanisms of the observed lines. For the TiII ion, for which no atomic data was previously available, we carry out ab initio calculations of radiative transition rates and electron impact excitation rate coefficients. It is found that the observed spectrum is consistent with the lines being excited in a mostly neutral region with an electron density of the order of $10^7$ cm$^{-3}$ and a temperature around 6000 K. In analyzing three observations with different slit orientations recorded between March~2000 and November~2001 we find line ratios that change among various observations, in a way consistent with changes of up to an order of magnitude in the strength of the continuum radiation field. These changes result from different samplings of the extended filament, due to the different slit orientations used for each observation, and yield clues on the spatial extent and optical depth of the filament. The observed emission indicates a large Ti/Ni abundance ratio relative to solar abundances. It is suggested that the observed high Ti/Ni ratio in gas is caused by dust-gas fractionation processes and does not reflect the absolute Ti/Ni ratio in the ejecta of \\etacar. We study the condensation chemistry of Ti, Ni and Fe within the filament and suggest that the observed gas phase overabundance of Ti

M. A. Bautista; H. Hartman; T. R. Gull; N. Smith; K. Lodders

2006-06-12T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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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261

Nature of carbon in Ni/. cap alpha. -Al/sub 2/O/sub 3/ catalyst deactivated by the methane-steam reforming reaction  

SciTech Connect (OSTI)

The mechanism of carbon formation on Ni surfaces has been studied extensively because of its importance both for coke formation on the Ni alloy reactor walls in steam cracking (pyrolysis) of naphtha or paraffinic gases in the petrochemical industry, and for catalyst deactivation in processes using supported Ni catalysts at high temperatures. Characterization of the carbon on Ni catalysts is desirable. In particular, the question whether the carbon is found only on the surface of Ni, or whether it also diffuses or dissolves in Ni, needs to be answered. Information on this is sought here from temperature programmed combustion of the carbon on/in Ni and from x-ray photoelectron spectroscopy (XPS). The very slow combustion of the C in the catalyst and an XPS study of the depth composition profile of the catalyst indicate that the C has diffused or dissolved into the bulk of Ni and a part of it is in a carbidic form.

De DeRen, J. (Laboratorium voor Petrochemische Techniek, Gent, Belgium); Menon, P.G.; Froment, G.F.; Haemers, G.

1981-07-01T23:59:59.000Z

262

Hydrogen Production by Low-temperature Steam Reforming of Bio-oil over Ni/HZSM-5 Catalyst  

Science Journals Connector (OSTI)

We investigated high catalytic activity of Ni/HZSM-5 catalysts synthesized by the impregnation method, which was successfully applied for low-temperature steam reforming of bio-oil. The influences of the catalyst composition, reforming temperature and the molar ratio of steam to carbon fed on the stream reforming process of bio-oil over the Ni/HZSM-5 catalysts were investigated in the reforming reactor. The promoting effects of current passing through the catalyst on the bio-oil reforming were also studied using the electrochemical catalytic reforming approach. By comparing Ni/HZSM-5 with commonly used Ni/Al2O3 catalysts, the Ni20/ZSM catalyst with Ni-loading content of about 20% on the HZSM-5 support showed the highest catalytic activity. Even at 450 °C, the hydrogen yield of about 90% with a near complete conversion of bio-oil was obtained using the Ni20/ZSM catalyst. It was found that the performance of the bio-oil reforming was remarkably enhanced by the HZSM-5 supporter and the current through the catalyst. The features of the Ni/HZSM-5 catalysts were also investigated via X-ray diffraction, inductively coupled plasma and atomic emission spectroscopy, hydrogen temperature-programmed reduction, and Brunauer-Emmett-Teller methods.

Song-bai Qiu; Lu Gong; Lu Liu; Cheng-gui Hong; Li-xia Yuan; Quan-xin Li

2011-01-01T23:59:59.000Z

263

Microstructure and magnetoelectric properties in Pb,,ZrxTi1-x...O3Ni composite ferroic films  

E-Print Network [OSTI]

Microstructure and magnetoelectric properties in Pb,,ZrxTi1-x...O3­Ni composite ferroic films 15213 Presented on 31 October 2005; published online 19 April 2006 Ferroic composite thin films composite films grown on SiO2/Si substrates at 650 °C, a perovskite structure was obtained when the Ni

Laughlin, David E.

264

Overall photocatalytic water splitting with NiOxSrTiO3 a revised Troy K. Townsend,a  

E-Print Network [OSTI]

catalysts assumes water oxidation to occur at the early transition metal oxide and water reduction at NiOx­La : KTaO3, and many layered perovskites. Introduction Splitting water into hydrogen and oxygen gas usingOverall photocatalytic water splitting with NiOx­SrTiO3 ­ a revised mechanism Troy K. Townsend

Osterloh, Frank

265

Hierarchically Structured Ni3S2/Carbon Nanotube Composites as High Performance Cathode Materials for Asymmetric Supercapacitors  

Science Journals Connector (OSTI)

Hierarchically Structured Ni3S2/Carbon Nanotube Composites as High Performance Cathode Materials for Asymmetric Supercapacitors ... Therefore, the active surface area of the Ni3S2 nanoparticles is increased, which further enhances the capacitive performance of the composite electrode. ... nickel sulfide; carbon nanotube; composite; cathode material; asymmetric supercapacitor ...

Chao-Shuan Dai; Pei-Yi Chien; Jeng-Yu Lin; Shu-Wei Chou; Wen-Kai Wu; Ping-Hsuan Li; Kuan-Yi Wu; Tsung-Wu Lin

2013-11-05T23:59:59.000Z

266

Direct Laser Deposition of a Single-Crystal Ni3Al-Based IC221W Alloy  

E-Print Network [OSTI]

process based on laser cladding, which involves laser processing fine metallic powders into fully denseDirect Laser Deposition of a Single-Crystal Ni3Al-Based IC221W Alloy WEIPING LIU and J.N. Du221W alloy were produced on a SX Ni-base superalloy substrate by means of the laser-engineered net

DuPont, John N.

267

Synthesis of FeNi3 Alloyed Nanoparticles by Hydrothermal Reduction Qilong Liao,, Rina Tannenbaum, and Zhong Lin Wang*,  

E-Print Network [OSTI]

method.12 The hydrothermal process appears to be a very effective method for preparing alloyedSynthesis of FeNi3 Alloyed Nanoparticles by Hydrothermal Reduction Qilong Liao,, Rina Tannenbaum paper presents a facile and low-cost hydrothermal method to synthesize stoichiometric FeNi3 alloy

Wang, Zhong L.

268

Structural model for the Al72Ni20Co8 decagonal quasicrystals National Renewable Energy Laboratory, Golden, Colorado 80401  

E-Print Network [OSTI]

Structural model for the Al72Ni20Co8 decagonal quasicrystals Yanfa Yan National Renewable Energy, Oak Ridge, Tennessee 37831 Received 15 February 2000 We propose a structure model for the Al72Ni20Co8 decagonal quasicrystals based on its 2 -inflated Al13Co4 approximant phase: Applying a 105 screw operation

Pennycook, Steve

269

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic glasses  

E-Print Network [OSTI]

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic June 2010 The corrosion properties of two Zr-based bulk metallic glass, Zr41Ti14Cu12Ni10Be23 LM1 and Zr potential, LM1b showed superior corrosion resistance to LM1. Under identical sample preparation and testing

Zheng, Yufeng

270

A206 74th Annual Meeting of the Meteoritical Society: Abstracts DIFFERENTIATION OF Fe-Ni SPHERULES IN IMPACT GLASS  

E-Print Network [OSTI]

-Ni SPHERULES IN IMPACT GLASS M. Schaffer, T. Kasama, R. E. Dunin-Borkowski , A. N. MacDonald and C. Bender Koch. University of Copenhagen, Denmark Metallic, micron sized Fe-Ni spherules are frequently reported from glasses indicator of impact details unexploited. In this work on the impact glass from Wabar we report

Dunin-Borkowski, Rafal E.

271

Vacancy ordered phases in AlCuNi as average lattices Anandh Subramaniam a,*, S. Ranganathan b  

E-Print Network [OSTI]

Vacancy ordered phases in Al­Cu­Ni as average lattices Anandh Subramaniam a,*, S. Ranganathan b, Bangalore 560012, India Abstract Vacancy ordered phases (VOP) in the Al­Cu­Ni system have an arrangement. Introduction Vacancy ordered phases (VOP) in Al-TM (transition metal) systems are a special class of structures

Subramaniam, Anandh

272

(La0.3Ge0.7)(Ni0.85Ge0.15)2Ge2  

Science Journals Connector (OSTI)

It contains the standardized crystallographic data set of (La0.3Ge0.7)(Ni0.85Ge0.15)2Ge2 representing the structure type (La0.30Ge0.70)(Ni0.85Ge0.15)2Ge2.

P. Villars; K. Cenzual; J. Daams…

2011-01-01T23:59:59.000Z

273

Determination of mechanical properties of Ni-Cr-P amorphous alloys  

E-Print Network [OSTI]

DETERMINATION OF MECHANICAL PROPERTIES OF Ni-Cr-P AMORPHOUS ALLOYS A Thesis by SWAROOP KUMAR R. KONDLAPUDI Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree.... Kondlapudi, B. E. , Qsmania University Co-Chairs of Advisory Committee : Dr. A. wolfenden Dr. R. Griffin A study of the mechanical properties of Ni80 xCrxPgp amorphous alloys (x = 0 to 40 at% in steps of 5. 0) has been undertaken at Texas A&M University...

Kondlapudi, Swaroop Kumar R

2012-06-07T23:59:59.000Z

274

Comment on the Evidence for a Monopole Resonance at Approximately 20 Mev in Ni-58  

E-Print Network [OSTI]

be accompanied by a brief abstract and a keyword abstract. Comment on the evidence for a monopole resonance at approximately 20 MeV in 5sNi U. Garg, P. Bogucki, J. D. Bronson, Y. -W. Lui, C. M. Rozsa, * and D. H. Youngblood Cyclotron Institute, Texas AckM... Uniuersity, College Station, Texas 77843 (Received 23 September 1981) Small-angle inelastic a scattering data for "Ni at 129 MeV have been reanalyzed with the giant resonance peak parameters suggested by Bertrand et al. The two components of the giant...

Garg, U.; Bogucki, P.; Bronson, J. D.; Lui, YW; Rozsa, C. M.; Youngblood, David H.

1982-01-01T23:59:59.000Z

275

Skladenjske posebnosti slovenš?ine v razmerjih glagol – vezljivost – stav?ni vzorec  

E-Print Network [OSTI]

združuje osebkovo-povedkovodolo?ilno vlogo (tj. združljivost/kompatibilnost oz. medsebojno odvisnost osebkove in poved- kovodolo?ilne vloge, tako da je osebkova samo formalnostavkotvorna vloga, povedkovodolo?ilna vloga pa je hkrati povedkovniška... pravega konkretnega osebka in zato tudi brez osebila oz. kon?niškega morfema (za izražanje oseb oz. osebka), am- pak ima za izražanje samo oblikovne/formalne dolo?nosti (na samo izrazni ravnini), tj. kon?niško obliko za tretjo osebo ednine, ki v zloženih...

Žele, Andreja

2011-01-01T23:59:59.000Z

276

Magnetic and superconducting phase diagrams in ErNi2B2C  

SciTech Connect (OSTI)

We present measurements of the superconducting upper critical field Hc2(T) and the magneticphasediagram of the superconductor ErNi2B2C made with a scanning tunneling microscope (STM). The magnetic field was applied in the basal plane of the tetragonal crystal structure. We have found large gapless regions in the superconductingphasediagram of ErNi2B2C, extending between different magnetic transitions. A close correlation between magnetic transitions and Hc2(T) is found, showing that superconductivity is strongly linked to magnetism.

Galvis, J.A.; Crespo, M.; Guillamon, I.; Suderow, Hermann; Vieira, S.; Garcia Hernandez, M.; Budko, Serguei; Canfield, Paul

2012-03-30T23:59:59.000Z

277

A study on the dual-phase treatment of weathering steel 09CuPCrNi  

Science Journals Connector (OSTI)

Dual-phase treatment processes, the resultant microstructures and the corresponding mechanical behavior and properties of weathering steel 09CuPCrNi have been studied. The results show that the microstructures of weathering steel 09CuPCrNi after intercritical quenching are characterized by an irregular distribution of island-shaped martensite in the matrix of equi-axed ferrite grains. Favorable mechanical properties and cold formability can be obtained through the intercritical quenching at 780 °C. The dual-phase-treated steel is superior in weldability to the as-received hot-rolled steel and its atmospheric corrosion resistance is better than that of the original.

Chunling Zhang; Dayong Cai; Bo Liao; Tianchen Zhao; Yunchang Fan

2004-01-01T23:59:59.000Z

278

Surface segregation effects in electrocatalysis: Kinetics ofoxygen reduction reaction on polycrystalline Pt3Ni alloy surfaces  

SciTech Connect (OSTI)

Effects of surface segregation on the oxygen reduction reaction (ORR) have been studied on a polycrystalline Pt3Ni alloy in acid electrolyte using ultra high vacuum (UHV) surface sensitive probes and the rotating ring disk electrode (RRDE) method. Preparation, modification and characterization of alloy surfaces were done in ultra high vacuum (UHV). Depending on the preparation method, two different surface compositions of the Pt3Ni alloy are produced: a sputtered surface with 75 % Pt and an annealed surface (950 K ) with 100 % Pt. The latter surface is designated as the 'Pt-skin' structure, and is a consequence of surface segregation, i.e., replacement of Ni with Pt atoms in the first few atomic layers. Definitive surface compositions were established by low energy ion scattering spectroscopy (LEISS). The cyclic voltammetry of the 'Pt-skin' surface as well as the pseudocapacitance in the hydrogen adsorption/desorption potential region is similar to a polycrystalline Pt electrode. Activities of ORR on Pt3Ni alloy surfaces were compared to polycrystalline Pt in 0.1M HClO4 electrolyte for the observed temperature range of 293 < T < 333 K. The order of activities at 333 K was: 'Pt-skin' > Pt3Ni (75% Pt) > Pt with the maximum catalytic enhancement obtained for the 'Pt-skin' being 4 times that for pure Pt. Catalytic improvement of the ORR on Pt3Ni and 'Pt-skin' surfaces was assigned to the inhibition of Pt-OHad formation (on Pt sites) versus polycrystalline Pt. Production of H2O2 on both surfaces were similar compared to the pure Pt. Kinetic analyses of RRDE data confirmed that kinetic parameters for the ORR on the Pt3Ni and 'Pt-skin' surfaces are the same as on pure Pt: reaction order, m=1, two identical Tafel slopes, activation energy, {approx} 21-25 kJ/mol. Therefore the reaction mechanism on both Pt3Ni and 'Pt-skin' surfaces is the same as one proposed for pure Pt i.e. 4e{sup -} reduction pathway.

Stamenkovic, V.; Schmidt, T.J.; Ross, P.N.; Markovic, N.M.

2002-11-01T23:59:59.000Z

279

Modeling and Characterization of the Magnetocaloric Effect in Ni2MnGa Materials  

SciTech Connect (OSTI)

Magnetic shape memory alloys have great promise as magneto-caloric effect refrigerant materials due to their combined magnetic and structural transitions. Computational and experimental research is reported on the Ni2MnGa material system. The magnetic states of this system are explored using the Wang-Landau statistical approach in conjunction with the Locally Self-consistent Multiple-Scattering method. The effects of alloying agents on the transition temperatures of the Ni2MnGa alloy are investigated using differential scanning calorimetry and superconducting quantum interference device. Experiments are performed at the Spallation Neutron Source at Oak Ridge National Laboratory to observe the structural and magnetic phase transformations.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Shassere, Benjamin [ORNL; Rios, Orlando [ORNL; Hodges, Jason P [ORNL; Ludtka, Gerard Michael [ORNL; Porter, Wallace D [ORNL; Safa-Sefat, Athena [ORNL; Rusanu, Aurelian [ORNL; Brown, Greg [ORNL; Evans III, Boyd Mccutchen [ORNL

2014-01-01T23:59:59.000Z

280

Polycrystalline oxides formation during transient oxidation of (001) Cu-Ni binary alloys studied by in situ TEM and XRD.  

SciTech Connect (OSTI)

The nucleation and growth of Cu{sub 2}O and NiO islands due to oxidation of Cu{sub x}Ni{sub 1-x} (001) films were monitored, at various temperatures, by in situ ultra-high vacuum (UHV) transmission electron microscopy (TEM) and in situ synchrotron X-ray diffraction (XRD). In remarkable contrast to our previous observations of Cu and Cu-Au oxidation, irregular-shaped polycrystalline oxide islands formed with respect to the Cu-Ni alloy film, and an unusual second oxide nucleation stage was noted. In situ XRD experiments revealed that NiO formed first epitaxially, then other orientations appeared, and finally polycrystalline Cu{sub 2}O developed as the oxidation pressure was increased. The segregation of Ni and Cu towards or away, respectively, from the alloy surface during oxidation could disrupt the surface and cause polycrystalline oxide formation.

Yang, J. C.; Li, Z. Q.; Sun, L.; Zhou, G. W.; Eastman, J. A.; Fong, D. D.; Fuoss, P. H.; Baldo, P. M.; Rehn, L. E.; Thompson, L. J.; Materials Science Division; Univ.of Pittsburgh; State Univ. of New York at Binghamton

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

Molecular oxygen adsorbates at a Au/Ni(111) surface alloy and their role in catalytic CO oxidation at 70 - 250 K  

E-Print Network [OSTI]

Oxygen is observed to adsorb molecularly on 0.13 - 0.27 ML Au/Ni(1 111) surface alloys at 77 K, in stark contrast to dissociative adsorption on Ni and no adsorption on Au surfaces. Molecular 02 adsorbates on the Au/Ni(111) ...

Lahr, David Louis

2006-01-01T23:59:59.000Z

282

Micro artificial muscle fiber using NiTi spring for soft robotics Sangbae Kim, Elliot Hawkes, Kyujin Cho, Matthew Jolda, Joe Foley and Robert Wood  

E-Print Network [OSTI]

from shape memory alloy (NiTi) coiled springs. An enhanced spring NiTi model describes the combination of micro-coil spring, we present a novel mesh-worm prototype that utilizes bio-inspired antagonistic structure alteration, NiTi can be restructured into coil springs. Chang et al.[1], discuss the numerous

Wood, Robert

283

Hydrogen production by steam reforming of simulated liquefied natural gas (LNG) over mesoporous nickel–M–alumina (M = Ni, Ce, La, Y, Cs, Fe, Co, and Mg) aerogel catalysts  

Science Journals Connector (OSTI)

Mesoporous nickel–M–alumina aerogel catalysts (denoted as NiMAE) with different second metal (M = Ni, Ce, La, Y, Cs, Fe, Co, and Mg) were prepared by a single-step sol–gel method and a subsequent CO2 supercritical drying method. The effect of second metal of mesoporous nickel–M–alumina aerogel catalysts on their physicochemical properties and catalytic activity for steam reforming of simulated liquefied natural gas (LNG) was investigated. Textural and chemical properties of NiMAE catalysts were strongly influenced by the identity of second metal. Nickel species were highly dispersed on the surface of NiMAE catalysts through the formation of nickel aluminate phase. In the steam reforming of LNG, both LNG conversion and hydrogen yield decreased in the order of NiLaAE > NiCeAE > NiYAE > NiCsAE > NiNiAE > NiFeAE > NiCoAE > NiMgAE. Average nickel diameter of NiMAE catalysts was well correlated with LNG conversion and hydrogen yield over the catalysts. Among the catalysts tested, NiLaAE catalyst exhibited the best catalytic performance due to its smallest average nickel diameter. Furthermore, NiLaAE catalyst exhibited a strong capability of facilitating heat and mass transfer of reactant and product during the steam reforming of LNG. Water–gas shift reaction governed the steam reforming reaction over NiLaAE catalyst under the steam-rich reaction condition (steam/carbon > 2).

Jeong Gil Seo; Min Hye Youn; Yongju Bang; In Kyu Song

2011-01-01T23:59:59.000Z

284

Magnetotransport properties of lithographically defined lateral CoNi80Fe20 wires  

E-Print Network [OSTI]

magnetic tunneling junction. We observed four distinct peaks in the magnetoresis- tance MR curves) and an asymmetric shift in the MR peak positions of the Ni80Fe20 wires below a critical point of 20 K. This asymmet substrate using the optical lithography and a combination of soft and hard lift-off techniques. Arrays of Si

Adeyeye, Adekunle

285

Improved Oxygen Reduction Activity on Pt3Ni(111) via Increased Surface Site Availability  

Science Journals Connector (OSTI)

...state-of-the-art Pt/C catalysts for PEMFC. The Pt3Ni(111...membrane fuel cell (PEMFC) is used in a demanding...platinum-loading) in current PEMFC stacks is needed...surface area in the cathode must be greatly...if stable cathode catalysts, with an order...

Vojislav R. Stamenkovic; Ben Fowler; Bongjin Simon Mun; Guofeng Wang; Philip N. Ross; Christopher A. Lucas; Nenad M. Markovi?

2007-01-26T23:59:59.000Z

286

SOME FOLIATIONS ON SURFACES IN CHARACTERISTIC 2. N.I. Shepherd-Barron  

E-Print Network [OSTI]

.I. Shepherd-Barron Math. Dept., Columbia University, New York NY 10027 x0. Introduction. 1 #12;2 N.I. SHEPHERD-BARRON Theorem 1.1. If X is a classical Enriques] that if A = 0, then h0( X ) = 0, and so A > 0. Lemma 1.3. There is a divisor B with A = 2B. (Note

Shepherd-Barron, Nick

287

Surface Treatment of NiO Hole Transport Layers for Organic Solar Cells  

SciTech Connect (OSTI)

Recent advances in the power-conversion efficiency of organic photovoltaics (OPVs) has largely been realized through the development of conjugated polymer absorber materials that provide for increased overlap with the solar spectrum as well as proper energy level offset with the electron acceptor. These allow for increased photocurrent and photovoltage, thus resulting in increased performance. Such systems could further be improved through the application of contact materials that have been tuned to minimize losses in carrier and potential losses at the charge-extraction interfaces. To date, these devices continue to use contacts that have not been optimized for the specific active layer components employed. Here, we demonstrate that the electrical and contact properties of NiO can be tuned through careful control of the deposition parameters as well as through surface treatments. The effects of the NiO thin-film processing and properties are investigated for application as a hole transport layer (HTL) in poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester OPV devices. Devices based on the NiO HTLs demonstrate equal performance to those employing poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) HTLs. Furthermore, the NiO HTLs enable the application of zinc-oxide-based materials as transparent electrodes.

Berry, Joseph J.; Widjonarko, N. Edwin; Bailey, Brian A.; Sigdel, Ajaya K.; Ginley, David S.; Olson, Dana C.

2010-01-01T23:59:59.000Z

288

Theoretical study of the photoelectron spectrum of (n5-C5H5)Ni(NO)  

E-Print Network [OSTI]

The valence photoelectron spectrum of cyclopentadienyl nickel nitrosyl (CpNiNO) was computed to determine the ion state orbital ordering of the 5e1, 7a1, and 3e2 bands. Calculations were performed with Hartree-Fock theory, density functional theory...

Miller, Thomas F.

2013-02-22T23:59:59.000Z

289

Effects of heat dissipation on unipolar resistance switching in Pt/NiO/Pt capacitors  

E-Print Network [OSTI]

Effects of heat dissipation on unipolar resistance switching in Pt/NiO/Pt capacitors S. H. Chang,1 151-747, Republic of Korea 3 School of Materials Science and Engineering, Seoul National University tBE and investigated their resistance switching behaviors. The capacitors with tBE 50 nm exhibited

Kahng, Byungnam

290

Ambient pressure thermal desorption spectroscopy (AP-TDS) of NiO/SiO2 catalysts  

Science Journals Connector (OSTI)

The Sabatier reaction is a key process in the “power-to-gas” application which is considered to contribute to...2 (NiO/SiO2) which is commonly used in the Sabatier reaction. A novel technique for the characteriza...

M. Städter; K. Müller; F. Rachow; M. Richter; D. Schmeißer

2013-12-01T23:59:59.000Z

291

Recent advances in alloy design of Ni{sub 3}Al alloys for structural use  

SciTech Connect (OSTI)

This is a comprehensive review of recent advances in R&D of Ni{sub 3}Al-based alloys for structural use at elevated temperatures in hostile environments. Recent studies indicate that polycrystalline Ni{sub 3}Al is intrinsically quite ductile at ambient temperatures, and its poor tensile ductility and brittle grain-boundary fracture are caused mainly by moisture-induced hydrogen embrittlement when the aluminide is tested in moisture- or hydrogen-containing environments. Tensile ductility is improved by alloying with substitutional and interstitial elements. Among these additives, B is most effective in suppressing environmental embrittlement and enhancing grain-boundary cohesion, resulting in a dramatic increase of tensile ductility at room temperature. Both B-doped and B-free Ni{sub 3}Al alloys exhibit brittle intergranular fracture and low ductility at intermediate temperatures (300-850 C) because of oxygen-induced embrittlement in oxidizing environments. Cr is found to be most effective in alleviating elevated-temperature embrittlement. Parallel efforts on alloy development using physical metallurgy principles have led to development of several Ni{sub 3}Al alloys for industrial use. The unique properties of these alloys are briefly discussed. 56 refs, 15 figs, 3 tabs.

Liu, C.T.; George, E.P.

1996-12-31T23:59:59.000Z

292

P0703-Hoegh The H2/H2O/Ni/Zirconia Point Electrode  

E-Print Network [OSTI]

on a model system of the SOFC (solid oxide fuel cell) anode. The model system was made by pressing a bent Ni) dominate when the cell is operated as a fuel cell (SOFC) and as an electrolyzer cell (SOEC, solid oxide Jens Høgh1 , Karin Vels Hansen1 , Ib Chorkendorff2 , Torben Jacobsen2 and Mogens Mogensen1 1 Fuel Cells

293

Evolution of microstructures inside the Ni-YSZ anode of a solid oxide fuel cell  

E-Print Network [OSTI]

Evolution of microstructures inside the Ni-YSZ anode of a solid oxide fuel cell Jeff Lillibridge Department of Mechanical & Aerospace Engineering Advisor: Mikko Haataja #12;What is a solid oxide fuel cell microstructuralcoarsening processes to electrochemical performancein solid oxide fuel cells: An integrated modeling approach

Petta, Jason

294

Study on Degradation of Solid Oxide Fuel Cell With Pure Ni Anode Zhenjun Jiaoa  

E-Print Network [OSTI]

Study on Degradation of Solid Oxide Fuel Cell With Pure Ni Anode Zhenjun Jiaoa , Naoki Shikazonoa Solid oxide fuel cell (SOFC) has attracted more and more attentions in the last few decades hydrogen as a fuel and pure oxygen as an oxidant. Anode-reference static current method, with a current

Kasagi, Nobuhide

295

Batch and Kinetic Studies of ni adsorption on Highly Humified newfoundland Peat  

E-Print Network [OSTI]

in the environment depend on soil geology and industrial activities. Ni mining (with Co recovery) in Newfoundland and labrador (Nl) could become a source of pollution if lime precipitation only is used for effluent treatment was air dried and sieved and fractions 850 µm constituting about 90% of the peat were separated and used

Coles, Cynthia

296

Transition metal interaction and Ni-Fe-Cu-Si phases in silicon T. Buonassisi,b  

E-Print Network [OSTI]

precipitation may reduce the lattice mismatch compared to single-metal precipitates, rendering mixed-metal-silicide recombination activity of metal silicide clusters. Common solar cell materials are not contaminated with justTransition metal interaction and Ni-Fe-Cu-Si phases in silicon M. Heuer,a T. Buonassisi,b A. A

297

Development of a nanostructure microstructure in the Al–Ni system using the electrospark deposition process  

Science Journals Connector (OSTI)

Electrospark deposition (ESD) was applied to produce aluminum–nickel coatings consisting of nanostructured Al and Al3Ni phases. An ESD electrode was manufactured from a hypo-eutectic aluminum–Al3Ni alloy using chill casting. Line deposition tests were performed to determine the optimal processing parameters resulting in a high quality deposit. X-ray diffraction (XRD) as well as optical and field emission scanning electron microscopy (FE-SEM), were performed to determine the composition and microstructure of the resulting depositions. It was determined that a capacitance of 20 ?F and a voltage of 100 V resulted in the highest quality deposition. Furthermore it was determined that the ESD process was capable of producing a microstructure consisting of highly refined aluminum and Al3Ni phases. The grain size of the aluminum phase was calculated, through the application of the Scherrer equation, to be ?25 nm. While, via scanning electron microscopy the grain size of the Al3Ni phase was determined to be ?44 nm. Also it was determined that multiple deposition passes resulted in increasing the thickness of the deposit, however resulted in decreased deposit quality. Furthermore, it was determined that increasing the energy-density (pulse-energy divided by electrode cross-sectional area) resulted in increasing deposit thickness, until a maximum was obtained using an energy-density of ?0.8 J/mm2. However, increasing the energy-density beyond this point resulted in decreased deposit quality.

D.W. Heard; M. Brochu

2010-01-01T23:59:59.000Z

298

Tic-Ni-based composite materials dispersion-strengthened by nanoparticles for electrospark deposition  

Science Journals Connector (OSTI)

The macrokinetic characteristic properties of the combustion process of mixtures in the TiC-Ni system with additives of nanosized ZrO2, Al2O3, Mo-Al2O3 powders, as well as the phase composition, structure, and pr...

E. A. Levashov; Yu. S. Pogozhev; A. E. Kudryashov…

2008-10-01T23:59:59.000Z

299

Collision Detection System Andrew Boissonnault, Akilesh Krishnamurthy Daiheng Ni, Russell Tessier  

E-Print Network [OSTI]

and of the Civil Engineering Department is working to develop a vehicle collision detection system. The systemCollision Detection System Andrew Boissonnault, Akilesh Krishnamurthy Daiheng Ni, Russell Tessier that would be mounted on the front of the vehicle. This system will gather information from all

Mountziaris, T. J.

300

Factors Affecting Ni and Zn Hydroxide Precipitate Formation in Soils. (S02-peltier222185-oral)  

E-Print Network [OSTI]

Factors Affecting Ni and Zn Hydroxide Precipitate Formation in Soils. (S02-peltier222185-oral) Authors: E.F. Peltier* - Univ. of Delaware D.L. Sparks - Univ. of Delaware Abstract: The formation matter in the soil. Speaker Information: Edward Peltier, Univ. of Delaware, Dept. of Plant and Soil

Sparks, Donald L.

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


301

Ni.sub.3 Al-based intermetallic alloys having improved strength above 850.degree. C.  

DOE Patents [OSTI]

Intermetallic alloys composed essentially of: 15.5% to 17.0% Al, 3.5% to 5.5% Mo, 4% to 8% Cr, 0.04% to 0.2% Zr, 0.04% to 1.5% B, balance Ni, are characterized by melting points above 1200.degree. C. and superior strengths at temperatures above 1000.degree. C.

Liu, Chain T. (Oak Ridge, TN)

2000-01-01T23:59:59.000Z

302

Ni3Al-based alloys for die and tool application  

DOE Patents [OSTI]

A novel Ni.sub.3 Al-based alloy exhibits strengths and hardness in excess of the standard base alloy IC-221M at temperatures of up to about 1000.degree. C. The alloy is useful in tool and die applications requiring such temperatures, and for structural elements in engineering systems exposed to such temperatures.

Liu, Chain T. (Oak Ridge, TN); Bloom, Everett E. (Kingston, TN)

2001-01-01T23:59:59.000Z

303

Fabrication of Ni-shims using UV-moulding as an intermediate step  

Science Journals Connector (OSTI)

We fabricated nickel-shims including various types of structures with dimensions from hundreds of nanometers to several microns. The mastering process was made by electron-beam lithography, lift-off and reactive ion etching techniques. Then the structures ... Keywords: Ni-shims, UV-moulding

Juha Pietarinen; Samuli Siitonen; Noora Tossavainen; Janne Laukkanen; Markku Kuittinen

2006-03-01T23:59:59.000Z

304

Measuring relative performance of an EDS detector using a NiO standard.  

SciTech Connect (OSTI)

A method for measuring the relative performance of energy dispersive spectrometers (EDS) on a TEM is discussed. A NiO thin-film standard fabricated at Sandia CA is used. A performance parameter,, is measured and compared to values on several TEM systems.

Sugar, Joshua Daniel; Kotula, Paul Gabriel [Sandia National Laboratories, Albuquerque, NM

2013-09-01T23:59:59.000Z

305

Evolution of Graphene Growth on Ni and Cu by Carbon Isotope Labeling  

E-Print Network [OSTI]

Evolution of Graphene Growth on Ni and Cu by Carbon Isotope Labeling Xuesong Li, Weiwei Cai, Luigi Instruments Incorporated, Dallas, Texas 75243 Received August 3, 2009 ABSTRACT Large-area graphene growth) of hydrocarbons has shown some promise in growing large-area graphene or few-layer graphene films on metal

306

Magnetization and EPR studies of the single molecule magnet Ni4 with integrated sensors  

E-Print Network [OSTI]

Magnetization and EPR studies of the single molecule magnet Ni4 with integrated sensors G. de 2007 Integrated magnetic sensors that allow simultaneous EPR and magnetization measurements have been with a micro-Hall effect magnetometer. EPR spectroscopy is used to determine the energy splitting between

del Barco, Enrique

307

Ni-NTA Magnetic Agarose Beads Handbook 12/200120 Detailed Protocols  

E-Print Network [OSTI]

Protocol Ni-NTA Magnetic Agarose Beads Handbook 12/200120 Detailed Protocols Protocol 1. Cell lysis appropriately. Adding 10 mM imidazole, inhibits binding of nontagged proteins. If the tagged protein does-NTA Magnetic Agarose Beads Handbook 12/2001 21 4. Sonicate or homogenize on ice to lyse cells (6 times for 10

Lebendiker, Mario

308

Comparative Studies of Magnetism in KNiF3 and K2NiF4  

Science Journals Connector (OSTI)

Bulk magnetic properties of the related antiferromagnets KNiF3 and K2NiF4 are analyzed by use of both high- and low-temperature theoretical methods. A crystal-field theory for the Ni2+ ion is outlined, using the strong-field coupling scheme, and is used to construct relevant spin Hamiltonians for the two systems. KNiF3 is found to be a simple-cubic antiferromagnet for which all except nearest-neighbor interactions are negligible. Writing an exchange interaction JSi·Sj between nearest-neighbor spins Si and Sj, the experimental observations are quantitatively fitted for J=89±4 °K with a suggestion of a small temperature dependence of J. Reasons are put forward to suggest that K2NiF4 is, to a very good approximation, a two-dimensional quadratic-layer antiferromagnet with a magnetic state which, over a large temperature region, shows a long-range order in two dimensions but not in the third. A good theoretical interpretation of most of the published experimental data can be obtained using such a picture. K2NiF4 is made up of NiF2 magnetic planes, which are essentially the same as those found in KNiF3, but with these magnetic layers separated in the third dimension by two nonmagnetic KF layers. We find an intraplane exchange J?125 °K and an interplane exchange J? which is at least an order of magnitude smaller and probably ferromagnetic in sign. A number of major differences between typical two- and three-dimensional magnetic structures are discussed, and some experiments are outlined for which the use of two- dimensional systems like K2NiF4 could provide new and interesting information concerning magnetic cooperative phenomena. Finally, the possible origins of the difference in exchange values J between KNiF3 and K2NiF4 are discussed, and the relevance of our findings in connection with the supposedly anomalous properties of another series containing two-dimensional antiferromagnets, namely, the calcium manganites, is assessed.

M. E. Lines

1967-12-10T23:59:59.000Z

309

Evaluation of high strength, high conductivity CuNiBe alloys for fusion energy applications  

SciTech Connect (OSTI)

The unirradiated tensile properties for several different heats and thermomechanical treatment conditions of precipitation strengthened Hycon 3HPTM CuNiBe (Cu-2%Ni-0.35%Be in wt.%) have been measured over the temperature range of 20-500 C for longitudinal and long transverse orientations. The room temperature electrical conductivity has also been measured for several heats, and the precipitate microstructure was characterized using transmission electron microscopy. The CuNiBe alloys exhibit very good combination of strength and conductivity at room temperature, with yield strengths of 630-725 MPa and electrical conductivities of 65-72% International Annealed Copper Standard (IACS). The strength remained relatively high at all test temperatures, with yield strengths of 420-520 MPa at 500 C. However, low levels of ductility (<5% uniform elongation) were observed at test temperatures above 200-250 C, due to flow localization near grain boundaries (exacerbated by having only 10-20 grains across the gage thickness of the miniaturized sheet tensile specimens). Scanning electron microscopy observation of the fracture surfaces found a transition from ductile transgranular to ductile intergranular fracture with increasing test temperature. Fission neutron irradiation to a dose of ~0.7 displacements per atom (dpa) at temperatures between 100 and 240 C produced a slight increase in strength and a significant decrease in ductility. The measured tensile elongation increased with increasing irradiation temperature, with a uniform elongation of ~3.3% observed at 240 C. The electrical conductivity decreased slightly following irradiation, due to the presence of defect clusters and Ni, Zn, Co transmutation products. Considering also previously published fracture toughness data, this indicates that CuNiBe alloys have irradiated tensile and electrical properties comparable or superior to CuCrZr and oxide dispersion strengthened copper at temperatures <250 C, and may be an attractive candidate for certain fusion energy structural applications. Conversely, CuNiBe may not be preferred at intermediate temperatures of 250-500 C due to the poor ductility and fracture toughness of CuNiBe alloys at temperatures >250 C. The potential deformation mechanisms responsible for the transition from transgranular to intergranular fracture are discussed. The possible implications for other precipitation hardened alloys such as nickel based superalloys are briefly discussed.

Zinkle, Steven J [ORNL] [ORNL

2014-01-01T23:59:59.000Z

310

Steam Reforming of Methane over Ni Catalysts Prepared from Hydrotalcite-Type Precursors: Catalytic Activity and Reaction Kinetics  

Science Journals Connector (OSTI)

Abstract Ni/Mg-Al catalysts derived from hydrotalcite-type precursors were prepared by a co-precipitation technique and applied to steam reforming of methane. By comparison with Ni/?-Al2O3 and Ni/?-Al2O3 catalysts prepared by incipient wetness impregnation, the Ni/Mg-Al catalyst presented much higher activity as a result of higher specific surface area and better Ni dispersion. The Ni/Mg-Al catalyst with a Ni/Mg/Al molar ratio of 0.5:2.5:1 exhibited the highest activity for steam methane reforming and was selected for kinetic investigation. With external and internal diffusion limitations eliminated, kinetic experiments were carried out at atmospheric pressure and over a temperature range of 823 ? 973 K. The results demonstrated that the overall conversion of CH4 and the conversion of CH4 to CO2 were strongly influenced by reaction temperature, residence time of reactants as well as molar ratio of steam to methane. A classical Langmuir-Hinshelwood kinetic model proposed by Xu and Froment (1989) fitted the experimental data with excellent agreement. The estimated adsorption parameters were consistent thermodynamically.

Yang Qi; Zhenmin Cheng; Zhiming Zhou

2014-01-01T23:59:59.000Z

311

Phase formation and morphological stability of ultrathin Ni-Co-Pt silicide films formed on Si(100)  

SciTech Connect (OSTI)

Ultrathin Ni, Co, and Pt films, each no more than 4?nm in thickness, as well as their various combinations are employed to investigate the competing growth of epitaxial Co{sub 1-y}Ni{sub y}Si{sub 2} films against polycrystalline Pt{sub 1-z}Ni{sub z}Si. The phase formation critically affects the morphological stability of the resulting silicide films, with the epitaxial films being superior to the polycrystalline ones. Any combination of those metals improves the morphological stability with reference to their parent individual metal silicide films. When Ni, Co, and Pt are all included, the precise initial location of Pt does little to affect the final phase formation in the silicide films and the epitaxial growth of Co{sub 1-x}Ni{sub x}Si{sub 2} films is always perturbed, in accordance to thermodynamics that shows a preferential formation of Pt{sub 1-z}Ni{sub z}Si over that of Co{sub 1-y}Ni{sub y}Si{sub 2}.

Xu, Peng; Wu, Dongping, E-mail: dongpingwu@fudan.edu.cn [State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433 (China); Kubart, Tomas; Gao, Xindong [Solid-State Electronics, The Ångström Laboratory, Uppsala University, P.O. Box 534, 75121 Uppsala (Sweden); Zhang, Shi-Li, E-mail: shili.zhang@angstrom.uu.se [State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, China and Solid-State Electronics, The Ångström Laboratory, Uppsala University, P.O. Box 534, 75121 Uppsala (Sweden)

2014-05-15T23:59:59.000Z

312

Three-dimensional microstructural changes in the Ni–YSZ solid oxide fuel cell anode during operation  

SciTech Connect (OSTI)

Microstructural evolution in solid oxide fuel cell (SOFC) cermet anodes has been investigated using X-ray nanotomography along with differential absorption imaging. SOFC anode supports composed of Ni and yttria-stabilized zirconia (YSZ) were subjected to extended operation and selected regions were imaged using a transmission X-ray microscope. X-ray nanotomography provides unique insight into microstructure changes of all three phases (Ni, YSZ, pore) in three spatial dimensions, and its relation to performance degradation. Statistically significant 3D microstructural changes were observed in the anode Ni phase over a range of operational times, including phase size growth and changes in connectivity, interfacial contact area and contiguous triple-phase boundary length. These observations support microstructural evolution correlated to SOFC performance. We find that Ni coarsening is driven by particle curvature as indicated by the dihedral angles between the Ni, YSZ and pore phases, and hypothesize that growth occurs primarily by means of diffusion and particle agglomeration constrained by a pinning mechanism related to the YSZ phase. The decrease in Ni phase size after extended periods of time may be the result of a second process connected to a mobility-induced decrease in the YSZ phase size or non-uniform curvature resulting in a net decrease in Ni phase size.

Nelson G. J.; Chu Y.; Grew, K.N.; Izzo Jr. J.R.; Lombardo, J.J.; Harris, W.M.; Faes, A.; Hessler-Wyser, A.; Van herle, J.; Wang, S.; Virkar, A.V.; Chiu, W.K.S.

2012-04-07T23:59:59.000Z

313

Anodically electrodeposited Co+Ni mixed oxide electrode: preparation and electrocatalytic activity for oxygen evolution in alkaline media  

SciTech Connect (OSTI)

Co+Ni mixed oxides on Ni substrate were prepared through anodic electrodeposition from Co(NO{sub 3}){sub 2} and Ni(NO{sub 3}){sub 2} aqueous solutions with five different Co{sup 2+}/Ni{sup 2+} ratios beside only Co{sup 2+}. By the electrochemical measurements, the optimum performance in electrocatalytic activity for oxygen evolution reaction in alkaline media was obtained on the Co+Ni mixed oxide deposited from the solution containing Co{sup 2+}/Ni{sup 2+} ratio of 1:1. The mixed oxide is corresponding to about 68at% Co contents with spinel-type NiCo{sub 2}O{sub 4} phase and porosity surface structure. The electrochemical kinetic parameters including exchange current density, Tafel slopes, reaction order with respect to [OH{sup -}] and standard electrochemical enthalpy of activation were analyzed also. A possible mechanism involving the formation of a physisorbed hydrogen peroxide intermediate in a slow electrochemical step was presented, which accounts for the values of the experimental results.

Wu Gang [Innovative Catalysis Program, Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084 (China)]. E-mail: wugang@mail.tsinghua.edu.cn; Li Ning [Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001 (China); Zhou Derui [Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001 (China); Mitsuo, Kurachi [Faculty of Engineering, Kyoto University, Kyoto 606-8283 (Japan); Xu Boqing [Innovative Catalysis Program, Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084 (China)

2004-10-01T23:59:59.000Z

314

Effect of reductant and PVP on morphology and magnetic property of ultrafine Ni powders prepared via hydrothermal route  

SciTech Connect (OSTI)

Graphical abstract: The ultrafine Ni powders with the shapes including sphere, pearl-string, leaf, fish-bone, hexagonal sheet and silknet were prepared through one-step hydrothermal reduction using different reductants. Their saturation magnetization, remanent magnetization and coercivity sequentially increase, and the coercivity of hexagonal sheet-like Ni powders increases by 25% compared with the Ni bulk counterpart. - Highlights: • The ultrafine Ni powders with various shapes of sphere, fish-bone, hexagonal sheet, etc. • Facile and one-step hydrothermal reduction using three reductants and PVP additive was developed. • Magnetic properties of the ultrafine Ni powders with different shapes were measured. • Compared with bulk Ni material, coercivity of hexagonal sheet Ni increases by 25%. • The formation mechanism of the shapes was suggested. - Abstract: The ultrafine nickel particles with different shapes including sphere, pearl-string, leaf, fish-bone, hexagonal sheet and silknet were prepared through one-step hydrothermal reduction using hydrazine hydrate, sodium hypophosphite and ethylene glycol as reductants, polyvinylpyrrolidone as structure-directing agent. It has been verified with the characterization of X-ray powder diffraction and transmission/scanning electronic microscopy that as-prepared products belong to face-centered cubic structure of nickel microcrystals with high purity and fine dispersity. The magnetic hysteresis loops measured at room temperature reveal that the values of saturation magnetization, remanent magnetization and coercivity rise sequentially from silknet, sphere to hexagonal sheet. In comparison with nickel bulk counterpart, the coercivity of the hexagonal sheet nickel powders increases by 25%.

Zhang, Jun, E-mail: j-zhang@126.com; Wang, Xiucai; Li, Lili; Li, Chengxuan; Peng, Shuge

2013-10-15T23:59:59.000Z

315

Effect of palladium addition on catalytic activity in steam methane reforming over Ni-YSZ porous membrane  

Science Journals Connector (OSTI)

Abstract This study investigated the additive effects of palladium, and the deposition method of palladium on Ni-YSZ porous membrane in steam methane reforming. Pd–Ni-YSZ porous membrane prepared by the wet impregnation method showed superior catalytic activity, where the methane conversion reached 94.6% at 650 °C, with H2 yield above 3.9. The palladium particles were well dispersed, and the Pd–Ni-YSZ porous membrane exhibited high adsorption capacity for water. The addition of palladium and the deposition method of palladium are very important for the steam methane reforming reaction.

Sang Moon Lee; Sung Chang Hong

2014-01-01T23:59:59.000Z

316

Silicon`s role in determining swelling in neutron-irradiated Fe-Cr-Ni-Si alloys  

SciTech Connect (OSTI)

Two silicon-modified alloy series, one based on Fe-15Cr-20Ni and another based on Fe-15Cr-25Ni were irradiated at target temperatures between 399 and 649{degree}C in EBR-II. The influence of silicon on swelling is more complex than previously envisioned and indicates that silicon plays two or more competing roles while in solution. Radiation-induced formation of {gamma}{prime} (Ni{sub 3}Si) precipitates is dependent on silicon and nickel content, as well as temperature. Precipitation of {gamma}{prime} appears to play only a minor role in void formation.

Sekimura, N. [Tokyo Univ., Tokai, Ibaraki (Japan); Garner, F. A. [Pacific Northwest Lab., Richland, WA (United States); Newkirk, J.W. [Missouri Univ., Rolla, MO (United States)

1991-11-01T23:59:59.000Z

317

Improving the phase stability and oxidation resistance of B-NiAl  

SciTech Connect (OSTI)

High temperature alloys are essential to many industries that require a stable material to perform in harsh oxidative environments. Many of these alloys are suited for specific applications such as jet engine turbine blades where most other materials would either melt or oxidize and crumble (1). These alloys must have a high melting temperature, excellent oxidation resistance, good creep resistance, and decent fracture toughness to be successfully used in such environments. The discovery of Ni based superalloys in the 1940s revolutionized the high temperature alloy industry and there has been continued development of these alloys since their advent (2). These materials are capable of operating in oxidative environments in the presence of combustion gases, water vapor and at temperatures around 1050 C. Demands for increased f uel efficiency, however, has highlighted the need for materials that can be used under similar atmospheres and at temperatures in excess of 1200 C. The current Ni based superalloys are restricted to lower temperatures due to the presence of a number of low melting phases that result in softening of the alloys above 1000 C. Therefore, recent research has been aimed at exploring and developing newer alloy systems that can meet the escalating requirements. This thesis comprises a part of such an effort. The motivation of this work is to develop a novel high temperature alloy system that shows improved performance at higher temperatures than the currently employed alloys. The desired alloy should be in accordance with the requirements established in the National Energy Technology Laboratory (NETL) FutureGen program having an operating temperature around 1300 C. Alloys based on NiAl offer significant potential payoffs as structural materials in gas turbine applications due to a unique range of physical and mechanical properties. Alloying additions to NiAl could be used to further improve the pertinent properties that currently limit this system from replacing Ni based superalloys. Modifications to NiAl were explored to increase the phase stability and oxidation resistance which would allow these alloys to be used at even higher temperatures yielding greater efficiencies. The extended Miedema model was an effective tool that screened all of the potential phase space for ternary substitutions to NiAl and found the few potential systems worth further investigation. After production of the alloys it was determined that Ir, Rh, and Pd were the top candidates for substitution on Ni site up to 12 at%. The melting temperature of NiAl could be increased as much as 150 C with 12 at% Ir and 130 C with 12 at% Rh substitution. Pall adium on the other hand decreased the melting temperature by 50 C at the 12 at% substitution level. The grain size was found to have a profound influence on the oxidation resistance. Both Ir and Rh substitutions resulted in finer grain sizes compared to Pd substitutions or base NiAl. The grain size increased drastically during high temperature annealing with the PGM substitutions hindering grain growth only slightly. However, the addition of 0.05 at% Hf limited the grain growth dramatically during high temperature annealing. NiAl inherently has respectable oxidation resistance up to 1100 C. It was found through experimental testing that both Ir and Rh substitutions improve the oxidation resistance of NiAl at ultra-high temperatures with Ir performing the best. Both PGM substitutions decreased the growth rate as well as forming a more adherent oxide scale. Pd substitutions appeared to have a negligible effect to the oxidation resistance of NiAl. Hafnium addition of 0.05 at% was found to decrease the oxidation rate as well as increase the scale adherence. The combination of both Ir substitution (6-9 at%) and Hf addition (0.05 at%) produced the alloy with the best oxidation resistance. Although improvements in phase stability and oxidation resistance have been made to the NiAl system, more development and testing are still needed. Two major issues yet to be resolved are the low fracture toughn

Brammer, Travis

2011-08-15T23:59:59.000Z

318

Predicting the Impact of El Niño on Future Temperature Extremes | U.S. DOE  

Office of Science (SC) Website

Predicting the Impact of El Niño on Future Temperature Extremes Predicting the Impact of El Niño on Future Temperature Extremes Biological and Environmental Research (BER) BER Home About Research Facilities Science Highlights Searchable Archive of BER Highlights External link Benefits of BER Funding Opportunities Biological & Environmental Research Advisory Committee (BERAC) News & Resources Contact Information Biological and Environmental Research U.S. Department of Energy SC-23/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3251 F: (301) 903-5051 E: sc.ber@science.doe.gov More Information » October 2012 Predicting the Impact of El Niño on Future Temperature Extremes Accurate prediction of El Niño-Southern Oscillation is crucial for simulating extreme maximum temperature. Print Text Size: A A A

319

Application of carbonized paper sludge as support of a Ni catalyst. Performance in steam reforming of methane  

Science Journals Connector (OSTI)

Carbonized paper sludge (C.P.S....) from an industrial waste was employed for steam reforming of methane, and Ni loaded C.P.S. pretreated at 973 K showed an initial methane conversion of over 90% at 1073 K...

Toru Kanno; Kiyoshi Tada; Jun-ichi Horiuchi…

2007-06-01T23:59:59.000Z

320

Frequency dependent magnetoconductivity and conductivity study in Ni-dispersed silica nano-composite produced by sol-gel technique  

Science Journals Connector (OSTI)

The low frequency (20 Hz to 1 MHz) ac conductivity and magnetoconductivity behaviour of ceramic nanocomposite (Ni-SiO2) at low temperature down to 77 K are reported. The frequency dependent conductivity followed ...

A. Sarkar; P. Ghosh; S. K. Chattopadhyay; A. K. Meikap…

Note: This page contains sample records for the topic "ura ni um" 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

Abnormal Cyclibility in Ni@Graphene Core–Shell and Yolk–Shell Nanostructures for Lithium Ion Battery Anodes  

Science Journals Connector (OSTI)

Abnormal Cyclibility in Ni@Graphene Core–Shell and Yolk–Shell Nanostructures for Lithium Ion Battery Anodes ... A new graphene-based hybrid nanostructure is designed for anode materials in lithium-ion batteries. ...

Huawei Song; Hao Cui; Chengxin Wang

2014-07-08T23:59:59.000Z

322

EFFECT OF AGING ON THE PHASE TRANSFORMATION AND MECHANICAL BEHAVIOR OF Ti36Ni49Hf15 HIGH  

E-Print Network [OSTI]

and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China (Received August 19 the microstructure, transformation temperature, mechanical properties and shape memory effects (SMEs) for Ti36Ni49Hf

Zheng, Yufeng

323

Growth of Large-Area Single- and Bi-Layer Graphene by Controlled Carbon Precipitation on Polycrystalline Ni Surfaces  

E-Print Network [OSTI]

We report graphene films composed mostly of one or two layers of graphene grown by controlled carbon precipitation on the surface of polycrystalline Ni thin films during atmospheric chemical vapor deposition (CVD). Controlling ...

Reina, Alfonso

2009-01-01T23:59:59.000Z

324

Chemical-looping combustion of syngas by means of spray-dried NiO oxygen carrier  

Science Journals Connector (OSTI)

Chemical-looping combustion (CLC) of syngas has a potential...2 and CO) appeared to be approximately the sum of the reaction rate of each fuel gas. The experimental results indicated that the spray-dried NiO oxyg...

Jeom-In Baek; Chong Kul Ryu; Tae Hyoung Eom…

2011-11-01T23:59:59.000Z

325

Ni coarsening in the three-phase solid oxide fuel cell anode - a phase-field simulation study  

E-Print Network [OSTI]

Ni coarsening in Ni-yttria stabilized zirconia (YSZ) solid oxide fuel cell anodes is considered a major reason for anode degradation. We present a predictive, quantative modeling framework based on the phase-field approach to systematically examine coarsening kinetics in such anodes. The initial structures for simulations are experimentally acquired functional layers of anodes. Sample size effects and error analysis of contact angles are examined. Three phase boundary (TPB) lengths and Ni surface areas are quantatively identified on the basis of the active, dead-end, and isolated phase clusters throughout coarsening. Tortuosity evolution of the pores is also investigated. We find that phase clusters with larger characteristic length evolve slower than those with smaller length scales. As a result, coarsening has small positive effects on transport, and impacts less on the active Ni surface area than the total counter part. TPBs, however, are found to be sensitive to local morphological features and are only i...

Chen, Hsun-Yi; Cronin, J Scott; Wilson, James R; Barnett, Scott A; Thornton, Katsuyo

2012-01-01T23:59:59.000Z

326

Use of periodic approximants in a dynamical LEED study of the quasicrystalline tenfold surface of decagonal Al-Ni-Co  

E-Print Network [OSTI]

of decagonal Al-Ni-Co K. Pussi Department of Electrical Engineering, Lappeenranta University of Technology, P.O. Box 20, FIN-53851 Lappeenranta, Finland N. Ferralis Physics Department and Materials Research

Widom, Michael

327

Systematic analysis of the crystal structure, chemical ordering, and microstructure of Ni-Mn-Ga ferromagnetic shape memory alloys  

E-Print Network [OSTI]

Ni-n-Ga based ferromagnetic shape-memory alloys (FSMAs) have shown great promise as an active material that yields a large output strain over a range of actuation frequencies. The maximum strain has been reported to be 6% ...

Richard, Marc Louis

2005-01-01T23:59:59.000Z

328

A novel preparation method for NiCo2O4 electrodes stacked with hexagonal nanosheets for water electrolysis  

Science Journals Connector (OSTI)

In this paper, we describe the preparation of a porous nanosheet-stacked NiCo2O4 composite electrode using a novel electrophoretic deposition (EPD) calcination method. The effects of the deposition time and volta...

Jun Yang; Jianbao Li; Hong Lin; Xiaozhan Yang…

2006-08-01T23:59:59.000Z

329

Production of Syngas via Partial Oxidation and CO2 Reforming of Coke Oven Gas over a Ni Catalyst  

Science Journals Connector (OSTI)

Production of Syngas via Partial Oxidation and CO2 Reforming of Coke Oven Gas over a Ni Catalyst ... The yield of produced syngas increases with an increase in temperature. ...

Jianzhong Guo; Zhaoyin Hou; Jing Gao; Xiaoming Zheng

2008-04-05T23:59:59.000Z

330

Micro-focussed XAFS spectroscopy to study Ni-bearing precipitates in the metal of corroded Zircaloy-2  

Science Journals Connector (OSTI)

The present work concerns an investigation of the local atomic environment of Ni-containing secondary phase precipitates (SPP) present in the metal-part of Zircaloy-2 cladding tubes. An unirradiated Zircaloy-2...

G. Kuri; C. Degueldre; J. Bertsch; S. Abolhassani

2010-03-01T23:59:59.000Z

331

Surface characterization and mechanical property of TiN/Ti-coated NiTi alloy by PIIID  

E-Print Network [OSTI]

significantly reduces the friction coefficient and improves wear resistance of the NiTi alloy. © 2006 Elsevier B prosthesis, heart valve replacement and biosensors [6,7]. TiN surface coating has also been found

Zheng, Yufeng

332

Interfacial mixing in as-deposited Si/Ni/Si layers analyzed by x-ray and polarized neutron reflectometry  

Science Journals Connector (OSTI)

Interdiffusion occurring across the interfaces in a Si/Ni/Si layered system during deposition at room temperature was probed using x-ray reflectivity (XRR) and polarized neutron reflectivity (PNR). Exploiting the complementarity of these techniques, both structural and magnetic characterization with nanometer depth resolution could be achieved. Suitable model fitting of the reflectivity profiles identified the formation of Ni–Si mixed alloy layers at the Si/Ni and Ni/Si interfaces. The physical parameters of the layered structure, including quantitative assessment of the stoichiometry of interfacial alloys, were obtained from the analyses of XRR and PNR patterns. In addition, PNR provided magnetic moment density profile as a function of depth in the stratified medium.

Debarati Bhattacharya; Saibal Basu; Surendra Singh; Sumalay Roy; Bhupendra Nath Dev

2012-01-01T23:59:59.000Z

333

A Study of Strain-Induced Phase Transformations in TiNi Alloy by Electric Resistance Method  

Science Journals Connector (OSTI)

It is generally recognized that the shape memory effect (SME) is associated the interaction of stress with thermoelastic martensitic transformation [1]. The phase transformations in TiNi alloy was reported to occ...

Yuan-Ti Muang; Li-Lin Lu; Lai-Zhi Zou…

1988-01-01T23:59:59.000Z

334

Metal-insulator transitions induced by doping in LaNiO{sub 3}: LaNi{sub 0.95}M{sub 0.05}O{sub 3} (M = Mo, W, Sb, Ti, Cu, Zn) perovskites  

SciTech Connect (OSTI)

Structural characterization and electronic properties of the LaNi{sub 0.95}M{sub 0.05}O{sub 3} (M = Mo, W, Sb, Ti, Cu, Zn) perovskite-like system are reported. These compounds can be regarded as being derived from LaNiO{sub 3} by partial substitution of Ni{sup 3+} in this material by M{sup 6+}, M{sup 5+}, M{sup 4+}, or M{sup 2+} formal cations, with a partial reduction of Ni{sup 3+} to Ni{sup 2+} taking place. X-ray powder diffraction data were analyzed by means of the Rietveld method and show that all the title materials present perovskite-type structure with a rhombohedral (S.G. R{bar 3}c) or orthorhombic (S.G. Pbnm) symmetry, depending on the nature of the M cation. In all cases, Ni and M cations are placed at random in octahedral B-sites of perovskite structure. Electrical resistivity measurements (four probe method) show metal-to-insulator (M-I) transitions for M = Mo, W, Ti, Cu, Zn at temperatures of about 50K and a semiconductor behavior for the Sb sample in the whole temperature range explored. Magnetic susceptibility measurements show the presence of weak ferromagnetic interactions for M = Sb and Pauli paramagnetism for the remaining compounds.

Alvarez, I.; Veiga, M.L.; Pico, C. [Univ. Complutense, Madrid (Spain)] [Univ. Complutense, Madrid (Spain)

1998-03-01T23:59:59.000Z

335

A Ni-Fe Layered Double Hydroxide-Carbon Nanotube Complex for Water Oxidation  

E-Print Network [OSTI]

Highly active, durable and cost-effective electrocatalysts for water oxidation to evolve oxygen gas hold a key to a range of renewable energy solutions including water splitting and rechargeable metal-air batteries. Here, we report the synthesis of ultrathin nickel iron layered double hydroxide nanoplates on mildly oxidized multi-walled carbon nanotubes. Incorporation of Fe into the nickel hydroxide induced the formation of NiFe-layered double hydroxide. The nanoplates were covalently attached to a network of nanotubes, affording excellent electrical wiring to the nanoplates. The ultra-thin Ni-Fe layered double hydroxide nanoplates/carbon nanotube complex was found to exhibit unusually high electro-catalytic activity and stability for oxygen evolution and outperformed commercial precious metal Ir catalysts.

Gong, Ming; Wang, Hailiang; Liang, Yongye; Wu, Justin Zachary; Zhou, Jigang; Wang, Jian; Regier, Tom; Wei, Fei; Dai, Hongjie

2013-01-01T23:59:59.000Z

336

Neutron capture cross section of unstable 63Ni: implications for stellar nucleosynthesis  

E-Print Network [OSTI]

The $^{63}$Ni($n, \\gamma$) cross section has been measured for the first time at the neutron time-of-flight facility n\\_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian Averaged Cross Sections were calculated for thermal energies from kT = 5 keV to 100 keV with uncertainties around 20%. Stellar model calculations for a 25 M$_\\odot$ star show that the new data have a significant effect on the $s$-process production of $^{63}$Cu, $^{64}$Ni, and $^{64}$Zn in massive stars, allowing stronger constraints on the Cu yields from explosive nucleosynthesis in the subsequent supernova.

C. Lederer; C. Massimi; S. Altstadt; J. Andrzejewski; L. Audouin; M. Barbagallo; V. Bécares; F. Bevá; F. Belloni; E. Berthoumieux; J. Billowes; V. Boccone; D. Bosnar; M. Brugger; M. Calviani; F. Calviño; D. Cano-Ott; C. Carrapiço; F. Cerutti; E. Chiaveri; M. Chin; N. Colonna; G. Cortés; M. A. Cortés-Giraldo; M. Diakaki; C. Domingo-Pardo; I. Duran; R. Dressler; N. Dzysiuk; C. Eleftheriadis; A. Ferrari; K. Fraval; S. Ganesan; A. R. García; G. Giubrone; M. B. Gómez-Hornillos; I. F. Gonçalves; E. González-Romero; E. Griesmayer; C. Guerrero; F. Gunsing; P. Gurusamy; D. G. Jenkins; E. Jericha; Y. Kadi; F. Käppeler; D. Karadimos; N. Kivel; P. Koehler; M. Kokkoris; G. Korschinek; M. Krtika; J. Kroll; C. Langer; H. Leeb; L. S. Leong; R. Losito; A. Manousos; J. Marganiec; T. Martínez; P. F. Mastinu; M. Mastromarco; M. Meaze; E. Mendoza; A. Mengoni; P. M. Milazzo; F. Mingrone; M. Mirea; W. Mondelaers; C. Paradela; A. Pavlik; J. Perkowski; M. Pignatari; A. Plompen; J. Praena; J. M. Quesada; T. Rauscher; R. Reifarth; A. Riego; F. Roman; C. Rubbia; R. Sarmento; P. Schillebeeckx; S. Schmidt; D. Schumann; G. Tagliente; J. L. Tain; D. Tarrío; L. Tassan-Got; A. Tsinganis; S. Valenta; G. Vannini; V. Variale; P. Vaz; A. Ventura; R. Versaci; M. J. Vermeulen; V. Vlachoudis; R. Vlastou; A. Wallner; T. Ware; M. Weigand; C. Weiß; T. J. Wright; P. Zugec

2013-04-11T23:59:59.000Z

337

Helium generation rates in isotopically tailored Fe-Cr-Ni alloys irradiated in FFTF/MOTA  

SciTech Connect (OSTI)

Three Fe-Cr-Ni alloys have been doped with 0.4% {sup 59}Ni for side-by-side irradiations of doped and undoped materials in order to determine the effects of fusion-relevant levels of helium production on microstructural development and mechanical properties. The alloys were irradiated in three successive cycles of the Materials Open Test Assembly (MOTA) located in the Fast Flux Test Facility (FFTF). Following irradiation, helium levels were measured by isotope dilution mass spectrometry. The highest level of helium achieved in doped alloys was 172 appm at 9.1 dpa for a helium(appm)-to-dpa ratio of 18.9. The overall pattern of predicted helium generation rates in doped and undoped alloys is in good agreement with the helium measurements.

Greenwood, L.R.; Garner, F.A. [Pacific Northwest Lab., Richland, WA (United States); Oliver, B.M. [Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.

1991-11-01T23:59:59.000Z

338

Model calculation of anisotropic charge and magnetic moment distribution on a Ni(001) surface  

Science Journals Connector (OSTI)

Anisotropies in the electronic charge and moment distribution on a (001) surface of Ni are influenced by the kinetic and Coulomb energies as well as by exchange and correlations. By using a simple model Hamiltonian the various contributions are analyzed. In particular we consider the effects of nonlocal exchange and correlation energies on the anisotropies. When we simulate a local exchange and correlation approximation, we find a decrease in the surface anisotropies (e.g., a moment in the 3z2-r2 orbital). The accompanying relative energy changes are very small, i.e., of the order of 10-4. The same holds true for anisotropies in the exchange splittings. A comparison is attempted between the results of the present model and recent ab initio calculations for the Ni surface in which the local-spin-density approximation is applied.

A. M. Oles and P. Fulde

1984-10-15T23:59:59.000Z

339

Influence of $?$ mesons on negative kaons in Ni+Ni collisions at 1.91A GeV beam energy  

E-Print Network [OSTI]

$\\phi$ and K$^-$ mesons from Ni+Ni collisions at the beam energy of 1.91A GeV have been measured by the FOPI spectrometer, with a trigger selecting central and semi-central events amounting to 51% of the total cross section. The phase space distributions, and the total yield of K$^-$, as well as the kinetic energy distribution and the total yield of $\\phi$ mesons are presented. The $\\phi$\\K$^-$ ratio is found to be $0.44 \\pm 0.07(\\text{stat}) ^{+0.18}_{-0.12} (\\text{syst})$, meaning that about 22% of K$^-$ mesons originate from the decays of $\\phi$ mesons, occurring mostly in vacuum. The inverse slopes of direct kaons are up to about 15 MeV larger than the ones extracted within the one-source model, signalling that a considerable share of gap between the slopes of K$^+$ and K$^-$ could be explained by the contribution of $\\phi$ mesons to negative kaons.

K. Piasecki; N. Herrmann; R. Averbeck; A. Andronic; V. Barret; Z. Basrak; N. Bastid; M. L. Benabderrahmane; M. Berger; P. Buehler; M. Cargnelli; R. ?aplar; P. Crochet; O. Czerwiakowa; I. Deppner; P. Dupieux; M. Dželalija; L. Fabbietti; Z. Fodor; P. Gasik; I. Gašpari?; Y. Grishkin; O. N. Hartmann; K. D. Hildenbrand; B. Hong; T. I. Kang; J. Kecskemeti; Y. J. Kim; M. Kirejczyk; M. Kiš; P. Koczon; R. Kotte; A. Lebedev; Y. Leifels; A. Le Fèvre; J. L. Liu; X. Lopez; V. Manko; J. Marton; T. Matulewicz; R. Münzer; M. Petrovici; F. Rami; A. Reischl; W. Reisdorf; M. S. Ryu; P. Schmidt; A. Schüttauf; Z. Seres; B. Sikora; K. S. Sim; V. Simion; K. Siwek-Wilczy?ska; V. Smolyankin; K. Suzuki; Z. Tymi?ski; P. Wagner; I. Weber; E. Widmann; K. Wi?niewski; Z. G. Xiao; I. Yushmanov; Y. Zhang; A. Zhilin; V. Zinyuk; J. Zmeskal

2014-12-15T23:59:59.000Z

340

Effects of alternating seawater flow and stagnant layup conditions on the general and localized corrosion resistance of CuNi and NiCu alloys in marine service  

SciTech Connect (OSTI)

From time-to-time seawater handling systems are subjected to lay-up which can produce chemical and biological changes, and conceivably alter the corrosion resistance of metals used in piping and other equipment. In the case of reverse osmosis/membrane technology type desalination equipment, sanitizing agents may be introduced after draining. Simulation tests were conducted to determine any effect of a bisulfite sanitizing treatment when used between periods of normal seawater flow. Corresponding tests were conducted with lay-up comprising non-refreshed seawater which ultimately stagnated. Test results for CuNi alloy C71500 indicted that repeated cycling between seawater exposure and bisulfite treatments was detrimental in reducing that alloy`s resistance to general corrosion, and to a lesser degree its crevice corrosion resistance. The typical pitting and crevice corrosion behavior of NiCu alloy N04400, found upon exposure to slowly moving, aerated seawater was neither diminished or accelerated by cyclic lay-up with either stagnant seawater or the candidate bisulfite-containing solution. However, some increase in general corrosion was observed.

Kain, R.M. [LaQue Corrosion Services, Wrightsville Beach, NC (United States); Weber, B.E. [NAWC-Aircraft Div., Patuxent River, MD (United States)

1997-12-01T23:59:59.000Z

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


341

BASELINE RISK ASSESSMENT OF GROUND WATER CONTAMINATION AT THE URAN~UM MILL TAILINGS  

Office of Legacy Management (LM)

I~:-:ii*.i: i,<;.;.-;_r- --:-:ir-- I~:-:ii*.i: i,<;.;.-;_r- --:-:ir-- - . . - -. . - . . - , -, . , , , - - - - . BASELINE RISK ASSESSMENT OF GROUND WATER CONTAMINATION AT THE URAN~UM MILL TAILINGS SITE NEAR RIVERTON, WYOMING I i I I I Prepared by the U.S. Department of Energy Albuquerque, New Mexico September 1995 INTENDED FOR PUBLIC RELEASE This report has been reproduced from the best available copy. Avai and microfiche Number of pages in this report: 166 DOE and DOE contractors can obtain copies of this report from: Office of Scientific and Technical information P.O. Box 62 Oak Ridge, TN 37831 (61 5) 576-8401 This report is publicly available from: National Technical information Service Department of Commerce 5285 Port Royal Road Springfield, VA 22161 (703) 487-4650 DOEIAL162350-65

342

Propagating spectroscopy of backward volume spin waves in a metallic FeNi film  

SciTech Connect (OSTI)

We report a propagating spin wave spectroscopy for a magnetostatic backward volume spin wave in a metallic Fe{sub 19}Ni{sub 81} film. We show that the mutual-inductance between two independent antennas detects a small but clear propagation signal of backward volume spin waves. All experimental data are consistent with the time-domain propagating spin-wave spectroscopy. The control of propagating backward spin wave enables to realize the miniaturize spin-wave circuit.

Sato, N.; Ishida, N.; Kawakami, T. [Department of Physics, Keio University, Hiyoshi 3-14-1, Yokohama 223-8522 (Japan); Sekiguchi, K., E-mail: koji-s@phys.keio.ac.jp [Department of Physics, Keio University, Hiyoshi 3-14-1, Yokohama 223-8522 (Japan); JST-PRESTO, Gobancho 7, Chiyoda-ku, Tokyo 102-0076 (Japan)

2014-01-20T23:59:59.000Z

343

Low energy ($p,?$) reactions in Ni and Cu nuclei using microscopic optical model  

E-Print Network [OSTI]

Radiative capture reactions for low energy protons have been theoretically studied for Ni and Cu isotopes using the microscopic optical model. The optical potential has been obtained in the folding model using different microscopic interactions with the nuclear densities from Relativistic Mean Field calculations. The calculated total cross sections as well as the cross sections for individually low lying levels have been compared with measurements involving stable nuclear targets. Rates for the rapid proton capture process have been evaluated for astrophysically important reactions.

G. Gangopadhyay

2010-08-05T23:59:59.000Z

344

Evaluating the effect of surface modifications on Ni based electrodes for alkaline water electrolysis  

Science Journals Connector (OSTI)

Abstract In an effort to improve the efficiency of alkaline water electrolysis for hydrogen production, surface modifications to Ni based electrodes were made by means of mechanical polishing using sandpapers of different sand grain sizes and chemical coating using electrochemical deposition of Ni and Co. The hydrogen evolution reaction was studied to reveal and compare the apparent and intrinsic activities of the electrodes, as indicated by the Tafel curves based on the geometric surface area and effective surface area, respectively. A relative roughness factor, which was estimated from the double layer capacitance in the impedance measurement, was introduced to characterise the effective surface area. The relative roughness factor of the six modified electrodes varied from 3.3 to 5.6. The electrode polished with the P400 sandpaper achieved the best apparent activity by possessing the lowest overpotential of 422 mV at the current density of 750 A m?2. For electrodes modified by the mechanical polishing, the Tafel curves collapsed into a narrow band when the current density was divided by the relative roughness factor, which validated the method of using the relative roughness factor for quantifying the effective surface area. The intrinsic activity of the hydrogen evolution reaction on Ni electrode can be expressed as ? = 0.02 + 0.191·Log(j?), where j? is the current density based on the effective surface area. For the electrodes modified by electrochemical depositions of Ni and Co, a variation in the intrinsic activity was observed for the different electrodes. This was attributed to their surface composition differences.

Kai Zeng; Dongke Zhang

2014-01-01T23:59:59.000Z

345

Enrichment of Fe and Ni at metal and oxide grain boundaries in corroded Zircaloy-2  

Science Journals Connector (OSTI)

Atom probe tomography has been used to study for the first time the metal–oxide interface region in Zircaloy-2. Segregation of Fe and Ni to both deformation-induced sub-grain boundaries in the metal and planar features in the oxide has been found. Apparently, the oxide inherits the chemistry of the sub-grain boundaries as the material oxidizes, which may have implications for the waterside corrosion kinetics of the alloy.

G. Sundell; M. Thuvander; H.-O. Andrén

2012-01-01T23:59:59.000Z

346

Preparation, optical and non-linear optical power limiting properties of Cu, CuNi nanowires  

SciTech Connect (OSTI)

Metallic nanowires show excellent Plasmon absorption which is tunable based on its aspect ratio and alloying nature. We prepared Cu and CuNi metallic nanowires and studied its optical and nonlinear optical behavior. Optical properties of nanowires are theoretically explained using Gans theory. Nonlinear optical behavior is studied using a single beam open aperture z-scan method with the use of 5?ns Nd: YAG laser. Optical limiting is found to arise from two-photon absorption.

Udayabhaskar, R.; Karthikeyan, B., E-mail: bkarthik@nitt.edu [Department of Physics, National Institute of Technology, Tiruchirappalli 620 015 (India); Ollakkan, Muhamed Shafi [Light and Matter Physics Group, Raman Research Institute, Bangalore 560 080 (India)] [Light and Matter Physics Group, Raman Research Institute, Bangalore 560 080 (India)

2014-01-06T23:59:59.000Z

347

Characterization of Ni/Al multilayer on Si substrate by diffraction and reflectometry techniques  

SciTech Connect (OSTI)

An ion beam deposited multilayer film of nominal thickness [Ni(200 Angst )/Al(100 Angst )]x5 on Si substrate has been characterized by X-Ray Diffraction(XRD), X-Ray Reflectivity (XRR) and Polarized neutron reflectivity(PNR). The present paper attempts to identify presence of any intermetallic compounds at the interfaces of the as-deposited sample. Structural parameters obtained from XRR and PNR are close to design values.

Swain, Mitali; Basu, Saibal; Bhattacharya, Debarati; Gupta, Mukul [Solid State Physics Division Bhabha Atomic Research Center, Mumbai 400085 (India); UGC-DAE-Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452017 (India)

2012-06-05T23:59:59.000Z

348

Bimetallic Ni-Rh catalysts with low amounts of Rh for the steam and autothermal reforming of n-butane for fuel-cell applications.  

SciTech Connect (OSTI)

Mono-metallic nickel and rhodium catalysts and bimetallic Ni-Rh catalysts supported on La-Al{sub 2}O{sub 3}, CeZrO{sub 2} and CeMgOx were prepared and evaluated for catalyzing the steam and autothermal reforming of n-butane. The binary Ni-Rh supported on La-Al{sub 2}O{sub 3} catalysts with low weight loading of rhodium exhibited higher H{sub 2} yields than Ni or Rh alone. The Ni-Rh/CeZrO{sub 2} catalyst exhibited higher performance and no coke formation, compared to the same metals on other supports. A NiAl{sub 2}O{sub 4} spinel phase was obtained on all Ni and Ni-Rh catalysts supported on La-Al{sub 2}O{sub 3}. The presence of rhodium stabilized the spinel phase as well as NiOx species upon reforming while Ni alone was mostly reduced into metallic species. Extended X-ray absorption fine-structure analysis showed evidence of Ni-Rh alloy during preparation and even further after an accelerated aging at 900C in a H{sub 2}/H{sub 2}O atmosphere.

Ferrandon, M.; Kropf, A. J.; Krause, T.; Chemical Sciences and Engineering Division

2010-05-15T23:59:59.000Z

349

Influence of dislocation-solute interactions on the mechanical properties of zirconium-doped NiAl  

SciTech Connect (OSTI)

Atom probe field ion microscopy (APFIM) has been used to characterize NiAl microalloyed with molybdenum and zirconium. Field ion images and atom probe analyses revealed segregation of zirconium to dislocation strain fields and ribbon-like morphological features that are probably related to dislocations. These results provide direct experimental evidence in support of the suggestion that the tremendous increase in the ductile-to-brittle transition temperature (DBTI) in zirconium-doped NiAl is due to pinning of dislocations by zirconium atoms. Atom probe analyses also revealed segregation of zirconium to grain boundaries. This result is consistent with the change from an intergranular fracture mode in undoped NiAl to a mixture of intergranular and transgranular fracture mode in zirconium-doped NiAl. The NiAl matrix was severely depleted of the solutes molybdenum and zirconium. Small Mo-rich precipitates, detected in the matrix and grain boundaries, are likely to contribute to the significant increase in the room-temperature yield stress of microalloyed NiAl through a precipitation hardening mechanism.

Jayaram, R. [Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Miller, M.K. [Oak Ridge National Lab., TN (United States)

1995-03-01T23:59:59.000Z

350

Isotopic identification of surface site transfer on Ni/Al/sub 2/O/sub 3/ catalysts  

SciTech Connect (OSTI)

Isotope labeling with temperature-programmed reaction (TPR) for CO hydrogenation was used to separate two distinct CO adsorption sites on a Ni/Al/sub 2/O/sub 3/ catalysts. One site is Ni metal and has the higher activity for CO hydrogenation. The less-reactive CO is on the Al/sub 2/O/sub 3/ support. Only the Ni metal is occupied at 300 K, and transfer for CO between the two sites occurs at higher temperatures. In the presence of adsorbed H/sub 2/, CO that was adsorbed on the Ni metal moved to the Al/sub 2/O/sub 3/ support. This is an activated process, and the only pathway to occupy the Al/sub 2/O/sub 3/ sites is by adsorption on the Ni. The reverse transfer from Al/sub 2/O/sub 3/ to Ni occurs if some of the H/sub 2/ is desorbed; surface hydrogen inhibits this reverse process. These results show that during a typical TPR experiment, transfer between sites competes with reaction.

Gugla, P.G.; Bailey, K.M.; Falconer, J.L.

1988-07-28T23:59:59.000Z

351

Duplex Oxide Formation during Transient Oxidation of Cu-5%Ni(001) Investigated by In situ UHV-TEM and XPS  

SciTech Connect (OSTI)

The transient oxidation stage of a model metal alloy thin film was characterized with in situ ultra-high vacuum (UHV) transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and analytic high-resolution TEM. We observed the formations of nanosized NiO and Cu{sub 2}O islands when Cu-5a5%Ni(100) was exposed to oxygen partial pressure, pO{sub 2} = 1 x 10{sup -4} Torr and various temperatures in situ. At 350 C epitaxial Cu{sub 2}O islands formed initially and then NiO islands appeared on the surface of the Cu{sub 2}O island, whereas at 750 C NiO appeared first. XPS and TEM was used to reveal a sequential formation of NiO and then Cu{sub 2}O islands at 550 C. The temperature-dependant oxide selection may be due to an increase of the diffusivity of Ni in Cu with increasing temperature.

Yang, J.C.; Starr, D.; Kang, Y.; Luo, L.; Tong, X.; Zhou, G.

2012-05-20T23:59:59.000Z

352

A practical grinding-assisted dry synthesis of nanocrystalline NiMoO{sub 4} polymorphs for oxidative dehydrogenation of propane  

SciTech Connect (OSTI)

A practical two-stage reactive grinding-assisted pathway waste-free and cost-effective for the synthesis of NiMoO{sub 4} has been successfully developed. It was demonstrated that proper design in synthetic strategy for grinding plays a crucial role in determining the ultimate polymorph of NiMoO{sub 4}. Specifically, direct grinding (DG) of MoO{sub 3} and NiO rendered {alpha}-NiMoO{sub 4} after annealing, whereas sequential grinding (SG) of the two independently pre-ground oxides followed by annealing generated {beta}-NiMoO{sub 4} solid solution. Characterizations in terms of Raman and X-ray diffraction suggest the creation of {beta}-NiMoO{sub 4} precursor in the latter alternative is the key aspect for the formation of {beta}-NiMoO{sub 4}. The DG-derived {alpha}-NiMoO{sub 4} tested by oxidative dehydrogenation of propane exhibited superior activity in contrast to its analog synthesized via conventional coprecipitation. It is suggested that the favorable chemical composition facilely obtained via grinding in contrast to that by coprecipitation was essential for achieving a more selective production of propylene. - Graphical Abstract: Grinding-assisted synthesis of NiMoO{sub 4} offers higher and more reproducible activities in contrast to coprecipitation for oxidative dehydrogenation of propane, and both {alpha}- and {beta}-NiMoO{sub 4} can be synthesized. Highlights: Black-Right-Pointing-Pointer NiMoO{sub 4} was prepared through grinding-assisted pathway. Black-Right-Pointing-Pointer Direct/sequential grinding rendered {alpha}-, {beta}-NiMoO{sub 4}, respectively. Black-Right-Pointing-Pointer Grinding-derived {alpha}-NiMoO{sub 4} showed high and reproducible activity for oxidative dehydrogenation of propane.

Chen Miao, E-mail: chenmiao@sinochem.com [Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433 (China); Zhejiang Chemical Industry Research Institute, Hangzhou 310023 (China); Wu Jialing; Liu Yongmei [Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433 (China); Cao Yong, E-mail: yongcao@fudan.edu.cn [Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433 (China); Guo Li [Zhejiang Chemical Industry Research Institute, Hangzhou 310023 (China); He Heyong; Fan Kangnian [Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433 (China)

2011-12-15T23:59:59.000Z

353

Critical cooling rate and thermal stability of Zr--Ti--Cu--Ni--Be alloys  

SciTech Connect (OSTI)

The critical cooling rate as well as the thermal stability are measured for a series of alloys in the Zr--Ti--Cu--Ni--Be system. Upon cooling from the molten state with different rates, alloys with compositions ranging along a tie line from (Zr{sub 70}Ti{sub 30}){sub 55}(Ni{sub 39}Cu{sub 61}){sub 25}Be{sub 20} to (Zr{sub 85}Ti{sub 15}){sub 55}(Ni{sub 57}Cu{sub 43}){sub 22.5}Be{sub 27.5} show a continuous increase in the critical cooling rate to suppress crystallization. In contrast, thermal analysis of the same alloys shows that the undercooled liquid region, the temperature difference between the glass transition temperature and the crystallization temperature, is largest for some compositions midway between the two endpoints, revealing that glass forming ability does not correlate with thermal stability. The relationship between the composition-dependent glass forming ability and thermal stability is discussed with reference to a chemical decomposition process.

Waniuk, Theodore A.; Schroers, Jan; Johnson, William L.

2001-02-26T23:59:59.000Z

354

Simultaneous adsorption of carbon and hydrogen on Ni(100). Nature of new forms of hydrogen absorption  

SciTech Connect (OSTI)

The authors have analyzed the form of hydrogen adsorption on Ni(100) upon simultaneous adsorption of carbon and hydrogen in the cluster approximation using the nonempirical Hartree-Fock method with subsequent allowance for electron correlation energy. The effect of carbon on the adsorbed hydrogen layer is indirect, through the surface metal atoms; and this perturbation is so great that it leads to substantial change in the type of bonding of the hydrogen to the surface. The calculations predict two types of adsorbed hydrogen on Ni(100). In the symmetric state /sup 2/A', the hydrogen has a modified four-coordinate bond with surface nickel atoms (the B/sub 4/ state) at a short distance to the surface (R/sub perpendicular to/ approx. 0.05 A). In this state, the adsorbed hydrogen tends to penetrate into the volume. In the other antisymmetry state /sup 2/A'', the hydrogen has a bridge bond (the B/sub 2/ state). The calculations predict that in this state the strength of the bond between hydrogen and the surface is greater than in the B/sub 4/ state. The bridge structure for hydrogen is not subject to a strong effect from adsorbed carbon. On the basis of an analysis of the calculated vibrational frequencies of the hydrogen-surface bond and other electronic parameters, they propose possible surface structures for hydrogen and carbon when they are simultaneously adsorbed on Ni(100)

Avdeev, V.I.

1987-07-01T23:59:59.000Z

355

NiFe2O4/activated carbon nanocomposite as magnetic material from petcoke  

Science Journals Connector (OSTI)

Abstract Nickel ferrite (NiFe2O4) was supported on activated carbon (AC) from petroleum coke (petcoke). Potassium hydroxide (KOH) was employed with petcoke to produce activated carbon. NiFe2O4 were synthesized using PEG-Oleic acid assisted hydrothermal method. The structural and magnetic properties were determined using thermogravimetric and differential thermal analysis (TGA–DTA), X-ray diffraction (XRD), Fourier Transform Infrared (IR-FT), surface area (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM). XRD analysis revealed the cubic spinel structure and ferrite phase with high crystallinity. IR-FT studies showed that chemical modification promoted the formation of surface oxygen functionalities. Morphological investigation by SEM showed conglomerates of spherical nanoparticles with an average particle size of 72 nm and TEM showed the formation of NiFe2O4/carbon nanofibers. Chemical modification and activation temperature of 800 °C prior to activation dramatically increased the BET surface area of the resulting activated carbon to 842.4 m2/g while the sulfur content was reduced from 6 to 1%. Magnetic properties of nanoparticles show strong dependence on the particle size.

Sarah Briceño; W. Brämer-Escamilla; P. Silva; J. García; H. Del Castillo; M. Villarroel; J.P. Rodriguez; M.A. Ramos; R. Morales; Y. Diaz

2014-01-01T23:59:59.000Z

356

Distribution of Si, Fe, and Ni in the Intracluster Medium of the Coma Cluster  

E-Print Network [OSTI]

We studied the distributions of Si, Fe, and Ni in the intracluster medium (ICM) of the Coma cluster, one of the largest clusters in the nearby universe, using XMM-Newton data up to 0.5 r180 and Suzaku data of the central region up to 0.16 r180. Using the flux ratios of Ly alpha of H-like Si and 7.8 keV blend to K alpha of He-like Fe, the abundance ratios of Si to Fe and Ni to Fe of the ICM were derived using APEC model v2.0.1. The Si/Fe ratio in the ICM of the Coma cluster shows no radial gradient. The emission weighted averages of the Si/Fe ratio in the ICM within 0.0--0.2 r180, 0.2--0.5 r180, and 0.0--0.5 r180 are 0.97 +- 0.11, 1.05 +- 0.36 and 0.99 +- 0.13, respectively, in solar units using the solar abundance of Lodders (2003). These values are close to those of smaller clusters and groups of galaxies. Using the Suzaku data of the central region, the derived Ni/Fe ratio of the ICM is 0.6--1.5 in solar units, according to the same solar abundance table. The systematic difference in the derived abundance r...

Matsushita, Kyoko; Sakuma, Eri; Sato, Kosuke

2012-01-01T23:59:59.000Z

357

High Energy Density Na-S/NiCl2 Hybrid Battery  

SciTech Connect (OSTI)

High temperature (250-350°C) sodium-beta alumina batteries (NBBs) are attractive energy storage devices for renewable energy integration and other grid related applications. Currently, two technologies are commercially available in NBBs, e.g., sodium-sulfur (Na-S) battery and sodium-metal halide (ZEBRA) batteries. In this study, we investigated the combination of these two chemistries with a mixed cathode. In particular, the cathode of the cell consisted of molten NaAlCl4 as a catholyte and a mixture of Ni, NaCl and Na2S as active materials. During cycling, two reversible plateaus were observed in cell voltage profiles, which matched electrochemical reactions for Na-S and Na-NiCl2 redox couples. An irreversible reaction between sulfur species and Ni was identified during initial charge at 280°C, which caused a decrease in cell capacity. The final products on discharge included Na2Sn with 1< n < 3, which differed from Na2S3 found in traditional Na-S battery. Reduction of sulfur in the mixed cathode led to an increase in overall energy density over ZEBRA batteries. Despite of the initial drop in cell capacity, the mixed cathode demonstrated relatively stable cycling with more than 95% of capacity retained over 60 cycles under 10mA/cm2. Optimization of the cathode may lead to further improvements in battery performance.

Lu, Xiaochuan; Lemmon, John P.; Kim, Jin Yong; Sprenkle, Vincent L.; Yang, Zhenguo (Gary) [Gary

2013-02-15T23:59:59.000Z

358

Laser power beaming to extend lives of GSO NiCd satellites  

SciTech Connect (OSTI)

It is proposed that a ground-based laser can beam power to commercial communication satellites in geosynchronous orbit and reduce battery depth-of-discharge during eclipses. Two laser system designs are presented which have the capability of reducing battery discharge by 100%. Both utilize a steerable beam director, with a mirror diameter of 4 meters in one case and 8 meters in the other. Both also use an adaptive optics unit within the beam train to provide real-time corrections for wavefront distortions caused by atmospheric turbulence. The required system power output is in the range of 100 to 200 kW for a transmitted wavelength just under 900 nm. Laser power beaming can nearly double the remaining lifetime of a satellite that uses NiCd batteries. However, by the time such lasers become available, nearly all NiCd satellites will be replaced by NiH{sub 2} satellites, which stand to benefit much less from power beaming.

Monroe, D.K.

1993-12-31T23:59:59.000Z

359

TiB2/Ni coatings on surface of copper alloy electrode prepared by electrospark deposition  

Science Journals Connector (OSTI)

In order to improve the lifespan of spot-welding electrodes used for welding zinc coated steel sheets, titanium diboride was deposited onto their surface after precoating nickel as an intermediate layer. The microstructures and phase compositions of TiB2 and Ni coatings were characterized by SEM and XRD. The coating hardness was measured using a microhardness tester. The results indicate that a satisfactory TiB2 coating is obtained as a result of the intermediate nickel layer acting as a good binder between the TiB2 coating and the copper alloy substrate. Owing to its capacity of deforming, the precoated nickel layer is dense and crack free, while cracks and pores are observed in the TiB2 coating. The hardness of the TiB2/Ni coating decreases with the increase of voltage and capacitance because of the diffusion of copper and nickel and the oxidation of the coating materials. Because of the good thermal and electrical conductivities and high hardness properties of TiB2, the deformation of the electrode with TiB2/Ni coating is reduced and its spot-welding life is by far prolonged than that of the uncoated one.

Cheng LUO; Xiang XIONG; Shi-jie DONG

2011-01-01T23:59:59.000Z

360

Molecular dynamics simulations of the melting curve of NiAl alloy under pressure  

SciTech Connect (OSTI)

The melting curve of B2-NiAl alloy under pressure has been investigated using molecular dynamics technique and the embedded atom method (EAM) potential. The melting temperatures were determined with two approaches, the one-phase and the two-phase methods. The first one simulates a homogeneous melting, while the second one involves a heterogeneous melting of materials. Both approaches reduce the superheating effectively and their results are close to each other at the applied pressures. By fitting the well-known Simon equation to our melting data, we yielded the melting curves for NiAl: 1783(1 + P/9.801){sup 0.298} (one-phase approach), 1850(1 + P/12.806){sup 0.357} (two-phase approach). The good agreement of the resulting equation of states and the zero-pressure melting point (calc., 1850 ± 25 K, exp., 1911 K) with experiment proved the correctness of these results. These melting data complemented the absence of experimental high-pressure melting of NiAl. To check the transferability of this EAM potential, we have also predicted the melting curves of pure nickel and pure aluminum. Results show the calculated melting point of Nickel agrees well with experiment at zero pressure, while the melting point of aluminum is slightly higher than experiment.

Zhang, Wenjin; Peng, Yufeng [College of Physics and electronic Engineering, Henan Normal University, Xinxiang, 453007 (China)] [College of Physics and electronic Engineering, Henan Normal University, Xinxiang, 453007 (China); Liu, Zhongli, E-mail: zhongliliu@yeah.net [College of Physics and Electric Information, Luoyang Normal University, Luoyang, 471002 (China)] [College of Physics and Electric Information, Luoyang Normal University, Luoyang, 471002 (China)

2014-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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
to obtain the most current and comprehensive results.


361

Structure and Properties of Magnetic (Co, Fe, Fe{sub 3}C and Ni) Carbon Beads  

SciTech Connect (OSTI)

Nanoparticles exhibit unique physical properties due to the surface or quantum-size effects. Particular attention has been focused on magnetic nanoparticles and substantial progress has been done in this field. In this work magnetic composites, consisting of elementary metals or carbides nanocrystallites, stabilized in carbon matrix, were prepared by the procedure comprising formation of appropriate metal acrylamide complexes, followed by frontal polymerization and pyrolysis of the polymer at various temperatures. Application of frontal polymerization and further pyrolysis enables formation of composite beads consisting of Co, Fe, Fe{sub 3}C or Ni nanocrystallites stabilized in carbon matrix. It was found that the lowest pyrolysis temperature, which enables the production of metallic nanocrystallites, was 673 K for Co and Ni, and 773 K for Fe. The magnetic properties of the beads, percentage of the metallic component, their composition and shape depended on the pyrolysis temperature. Extracts on the basis of composites containing Fe{sub 3}C showed no cytotoxicity, whereas those containing Co and Ni exhibited negligible cytotoxicity up to concentrations of 6.25 mg/ml.

Leonowicz, Marcin; Izydorzak, Marta [Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw (Poland); Pomogailo, Anatolii D.; Dzhardimalieva, Gulzhian I. [Institute of Chemical Physics RAS, Chernogolovka (Russian Federation)

2010-12-02T23:59:59.000Z

362

Oxygen electrode bifunctional electrocatalyst NiCo/sub 2/O/sub 4/ spinel  

SciTech Connect (OSTI)

A significant increase in energy density may be possible if a two-unit alkaline regenerative H2-O2 fuel cell is replaced with a single-unit system that uses passive means for H2O transfer and thermal control. For this single-unit system, new electrocatalysts for the O2 electrode will be required which are not only bifunctionally active but also chemically and electrochemically stable between the voltage range of about 0.7 and 1.5 V. NiCo2O4 spinel is reported to have certain characteristics that make it useful for a study of electrode fabrication techniques. High surface area NiCo2O4 powder was fabricated into unsupported, bifunctional, PTFE-bonded, porous gas fuel cell electrodes by commercial sources using varying PTFE contents and sintering temperatures. The object of this study is to measure the bifunctional activities of these electrodes and to observe what performance differences might result from different commercial electrode fabricators. O2 evolution and O2 reduction data were obtained at 80 C (31 percent KOH). An irreversible reaction (i.e., aging) occurred during O2 evolution at potentials greater than about 1.5 V. Anodic Tafel slopes of 0.06 and 0.12 V/decade were obtained for the aged electrodes. Within the range of 15 to 25 percent, the PTFE content was not a critical parameter for optimizing the electrode for O2 evolution activity. Sintering temperatures between 300 and 340 C may be adequate but heating at 275 C may not be sufficient to properly sinter the PTFE-NiCo2O4 mixture. Electrode disintegration was observed during O2 reduction. Transport of O2 to the NiCo2O4 surface became prohibitive at greater than about -0.02 A/sq cm. Cathodic Tafel slopes of -0.6 and -0.12 V/decade were assumed for the O2 reduction process. A PTFE content of 25 percent (or greater) appears to be preferable for sintering the PTFE-NiCo2O4 mixture.

Fielder, W.L.; Singer, J.

1988-09-01T23:59:59.000Z

363

Combustion synthesis/quasi-isostatic pressing of TiC0.7NiTi cermets: microstructure and transformation characteristics  

E-Print Network [OSTI]

Combustion synthesis/quasi-isostatic pressing of TiC0.7­NiTi cermets: microstructure Abstract TiC0.7­NiTi cermets were produced by com- bustion synthesis followed by quasi-isostatic consolidation while the reaction products were still hot and ductile. The TiC0.7­NiTi cermets were characterized

Meyers, Marc A.

364

Microstructure degradation of YSZ in Ni/YSZ anodes of SOFC operated in phosphine-containing fuels  

SciTech Connect (OSTI)

The interaction of trace (ppm) phosphine with the nickel/yttria stabilized zirconia (YSZ) anode of commercial solid oxide fuel cells has been investigated and evaluated for both synthesis gas and hydrogen fuels in an effort to examine P–Y reactions. The Ni poisoning effects reported in literature were confirmed and degradation was examined by electrochemical methods and post-test microstructural and chemical analyses. The results indicate that P-induced degradation rates and mechanisms are fuel dependent and that degradation of cells operated in synthesis gas (syngas) with phosphine is more severe than that of cells operated in hydrogen with phosphine. As reported in published literature, a cell operated in syngas containing 10 ppm phosphine demonstrated significant microstructural degradation within the Ni phase, including formation of Ni–P phases concentrated on the outer layer of the anode and significant pitting corrosion in the Ni grains. In this research, a previously undetected YPO{sub 4} phase is observed at the YSZ/YSZ/Ni triple grain junctions located at the interface with the YSZ electrolyte. Tetragonal YSZ (t-YSZ) and cubic-YSZ (c-YSZ) domains with sizes of several tens of nanometers are also newly observed along the Ni/YSZ interface. These observations contrast with data obtained for a cell operated in dry hydrogen with phosphine, where no YPO{sub 4} phase is observed and the alternating t-YSZ and c-YSZ domains at the Ni/YSZ interface are smaller with typical sizes of 5–10 nm. The data imply that electrolyte attack by P is a potentially debilitating mode of degradation in SOFC anodes, and that the associated reaction mechanisms and rates are worthy of further examination.

Chen, Yun; Chen, Song; Hackett, Gregory; Finklea, Harry; Zondlod, John; Celik, Ismail; Song, Xueyan; Gerdes, Kirk

2013-03-07T23:59:59.000Z

365

Structural studies of two novel La-Sn compounds: La30Sn30 and La32Ni2Sn35  

SciTech Connect (OSTI)

Two novel intermetallic compounds containing lanthanum and tin have been obtained for the first time. Single crystal structures of these two phases, La{sub 30}Sn{sub 30} and La{sub 32}Ni{sub 2}Sn{sub 35} have been studied by X-ray crystallography. La{sub 30}Sn{sub 30} is a new 1:1 binary containing La and Sn and has been refined in the Cmmm space group. This phase was made at high temperatures (<1200 C) from a loaded composition of La{sub 68}Sn{sub 70}. Unlike the reported 1:1 binary, LaSn which crystallizes in the Cmcm space group (only powder X-ray diffraction studies reported), La{sub 30}Sn{sub 30} forms good crystals for structural determination. The crystal structure of La{sub 30}Sn{sub 30} show Sn-Sn dimers and Sn-centered, face-sharing biaugmented triangular prisms composed of La atoms. La{sub 30}Sn{sub 30} does not belong to any known structure-type. La{sub 32}Ni{sub 2}Sn{sub 35} was obtained in high yields at high temperatures (> 1200 C) and refined in the 14/mmm space group. It belongs to the USi structure type in which the Ni/Sn atoms occupy the Si sites, and La/Sn atoms occupy the U sites. The crystal structure of La{sub 32}Ni{sub 2}Sn{sub 35} consists of buckled sheets made from La-centered, corner-shared octahedra of Sn. These sheets are intraconnected through Ni-Sn-Ni bonds along the c-axis. The crystals are not air sensitive, unlike La{sub 30}Sn{sub 30}, which can be attributed to the presence of Ni in the crystal structure.

Yang, Amie S.

2005-05-01T23:59:59.000Z

366

Investigation of a two-state Tafel phenomenon for the oxygen evolution reaction on an amorphous Ni-Co alloy  

SciTech Connect (OSTI)

The anodic polarization for the oxygen evolution reaction of many metals and metal alloys results in the measurement of two Tafel regions, one for low overpotentials and one for high overpotentials. The polarization of the amorphous Ni{sub 50}Co{sub 25}P{sub 15}B{sub 10} alloy resulted in the measurement of a Tafel plot which appeared to have two different states linked by a transition potential region that was dependent on electrode pretreatment. A ``limiting current`` phenomenon in the transition region, in which the current appears to be independent of the potential, on the amorphous Ni{sub 50}Co{sub 25}P{sub 15}B{sub 10} alloy was observed. The limiting-current phenomenon in the transition region may reflect changes of the electrodes surface oxidation states and the oxygen reaction mechanisms in the two Tafel regions. This limiting current transition region was investigated by dc anodic polarization, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy (XPS). A time-dependent impedance behavior was observed coincident with a limiting current in the Tafel plot within the same potential region. This was further characterized by means of a fixed frequency impedance measurement. XPS spectra of oxidation species of Ni were obtained from the amorphous Ni{sub 50}Co{sub 25}P{sub 15}B{sub 10} alloy and were compared with the spectra of chemically synthesized Ni oxide and hydroxides. The XPS results from the amorphous Ni-Co alloy electrode polarized in the two Tafel regions revealed different surface chemistries. The ``limiting current`` phenomenon could thus be attributed to a slow, surface place exchange between Ni and Co sites and a further oxidation of the surface from the low overpotential Tafel region to the high overpotential Tafel region.

Lian, K.K.; Kirk, D.W.; Thorpe, S.J. [Univ. of Toronto, Ontario (Canada)

1995-11-01T23:59:59.000Z

367

EXPLORATION ACTIVITY WORKSHEET Purpose: The exploration activity is designed for students to "explore" opportunities at UM as they  

E-Print Network [OSTI]

EXPLORATION ACTIVITY WORKSHEET Purpose: The exploration activity is designed for students to "explore" opportunities at UM as they relate to student success, majors, careers of interest and other of their academic development and thus, you and your advisor will determine what type of activity or process you

Hill, Wendell T.

368

Projeto: Compilao de um corpus representativo do portugus do Brasil e anlise multidimensional da variao entre gneros  

E-Print Network [OSTI]

Projeto: Compilação de um corpus representativo do português do Brasil e análise multidimensional do Brasil e organizado de acordo com convenções aplicadas internacionalmente. Pesquisas desenvolvidas relativamente pequena, e deverá ser ampliada para tornar-se mais representativa do Português do Brasil e servir

369

INVESTIGATION OF LASER SUPPORTED DETONATION WAVES AND THERMAL COUPLING USING 2.8um HF LASER IRRADIATED METAL TARGETS  

E-Print Network [OSTI]

INVESTIGATION OF LASER SUPPORTED DETONATION WAVES AND THERMAL COUPLING USING 2.8um HF LASER of Hull, Hull, HU6 7RX, England. Abstract.- The formation and propagation of laser supported detonation was obtained in a of laser supported detonation waves and thermal o. 300 nsec. pulse (FHHM). The laser output

Boyer, Edmond

370

Investigation of a prototype 150 um microfluidic device and IMS-ToF mass spectrometry for high-  

E-Print Network [OSTI]

would decreasing analysis time add value? Qualitative Proteomics Experiments · Protein ID, confirmation Electrical Connections (EEPROM, Heater) ESI Emitter Assembly #12;Evaluation Areas for Prototype 150 um Tile ID09969_01_UCA195_3302_030513.raw:1 ID09969_01_UCA195_3302_030513.raw : 1 Label-Free Quantitation

Richardson, David

371

Effect of ceria loading on the carbon formation during low temperature methane steam reforming over a Ni/CeO2/ZrO2 catalyst  

Science Journals Connector (OSTI)

The characterization and catalytic activity of a Ni/CeO2/ZrO2 catalyst for methane steam reforming at 600°C were investigated. The addition...

Anton Purnomo; Susan Gallardo; Leonila Abella…

2008-12-01T23:59:59.000Z

372

Evaluation of Pre-sulfided NiMo/?-Al2O3 for Hydrodeoxygenation of Microalgae Oil to Produce Green-diesel  

Science Journals Connector (OSTI)

Evaluation of Pre-sulfided NiMo/?-Al2O3 for Hydrodeoxygenation of Microalgae Oil to Produce Green-diesel ... Energy Fuels, Just Accepted Manuscript ...

Lin Zhou; Adeniyi Lawal

2014-12-05T23:59:59.000Z

373

First ground-based 200-um observing with THUMPER on JCMT - sky characterisation and planet maps  

E-Print Network [OSTI]

We present observations that were carried out with the Two HUndred Micron PhotometER (THUMPER) mounted on the James Clerk Maxwell Telescope (JCMT) in Hawaii, at a wavelength of 200 um (frequency 1.5 THz). The observations utilise a small atmospheric window that opens up at this wavelength under very dry conditions at high-altitude observing sites. The atmosphere was calibrated using the sky-dipping method and a relation was established between the optical depth, tau, at 1.5 THz and that at 225 GHz: tau_1.5THz = (95 +/- 10)*tau_225GHz. Mars and Jupiter were mapped from the ground at this wavelength for the first time, and the system characteristics measured. A noise equivalent flux density (NEFD) of ~65 +/- 10 Jy (1 sigma 1 second) was measured for the THUMPER-JCMT combination, consistent with predictions based upon our laboratory measurements. The main-beam resolution of 14 arcsec was confirmed and an extended error-beam detected at roughly two-thirds of the magnitude of the main beam. Measurements of the Sun allow us to estimate that the fraction of the power in the main beam is ~15%, consistent with predictions based on modelling the dish surface accuracy. It is therefore shown that the sky over Mauna Kea is suitable for astronomy at this wavelength under the best conditions. However, higher or drier sites should have a larger number of useable nights per year.

D. Ward-Thompson; P. A. R. Ade; H. Araujo; I. Coulson; J. Cox; G. R. Davis; Rh. Evans; M. J. Griffin; W. K. Gear; P. Hargrave; P. Hargreaves; D. Hayton; B. J. Kiernan; S. J. Leeks; P. Mauskopf; D. Naylor; N. Potter; S. A. Rinehart; R. Sudiwala; C. R. Tucker; R. J. Walker; S. L. Watkin

2005-09-22T23:59:59.000Z

374

Microstructural and chemical evolution near anode triple phase boundary in Ni/YSZ solid oxide fuel cells  

SciTech Connect (OSTI)

In this study, we report the microstructural and chemical evolution of anode grain boundaries and triple phase boundary (TPB) junctions of Ni/YSZ anode supported solid oxide fuel cells. A NiO phase was found to develop along the Ni/YSZ interfaces extending to TPBs in the operated cells. The thickness of the NiO ribbon phase remains constant at ~5 nm in hydrogen for operating durations up to 540 h. When operating on synthesis gas, an increase in interphase thickness was observed from ~11 nm for 24 h of operation to ~51 nm for 550 h of operation. YSZ phases are observed to be stable in H2 over 540 h of operation. However, for the cell operated in syngas for 550 h, a 5–10 nm tetragonal YSZ (t-YSZ) interfacial layer was identified that originated from the Ni/YSZ interfaces. Yttrium species seem to segregate to the interfaces during operation, leading to the formation of t-YSZ in the Y-depleted regions.

Chen, Yun; Chen, Song; Hacket, Gregory; Finklea, Harry; Song, Zueyan; Gerdes, Kirk

2011-12-01T23:59:59.000Z

375

Microstructural and chemical evolution near anode triple phase boundary in Ni/YSZ solid oxide fuel cells  

SciTech Connect (OSTI)

In this study, we report the micro-structural and chemical evolution of anode grain boundaries and triple phase boundary (TPB) junctions of Ni/YSZ anode supported solid oxide fuel cells. A NiO phase was found to develop along the Ni/YSZ interfaces extending to TPBs in the operated cells. The thickness of the NiO ribbon phase remains constant at ~ 5 nm in hydrogen for operating durations up to 540 h. When operating on synthesis gas, an increase in interphase thickness was observed from ~ 11 nm for 24 h of operation to ~ 51 nm for 550 h of operation. YSZ phases are observed to be stable in H{sub 2} over 540 h of operation. However, for the cell operated in syngas for 550 h, a 5–10 nm tetragonal YSZ (t-YSZ) interfacial layer was identified that originated from the Ni/YSZ interfaces. Yttrium species seem to segregate to the interfaces during operation, leading to the formation of t-YSZ in the Y-depleted regions.

Chen, Yun; Chen, Song; Hackett, Gregory; Finklea, Harry; Song, Xueyan; Gerdes, Kirk

2011-12-12T23:59:59.000Z

376

Combined molten salt–Ni/Al2O3 as synergistic medium for high-quality syngas production  

Science Journals Connector (OSTI)

Abstract Proposed synergistic use of a combined medium of molten salt and Ni/Al2O3 (MS-Ni) was investigated for its enhancement of cellulose pyrolysis for high-quality syngas production. Clean renewable solar energy is to be stored at a high temperature in molten salt (MS) and provides the heat of pyrolysis. The MS-Ni medium could increase H2 yield by 3-folds while CO yield slightly increased by 15%, compared to the case of only MS medium. The peak rate of H2 production nearly quadrupled while the peak rate of CO production increased 2.5 times at about 150 and 80 K lower temperatures, respectively. The ratio of selectivity of syngas to undesired CH4 was nearly doubled. Arrhenius rate expressions for pseudo-first-order pyrolytic reaction are derived from the experimental data to give activation energies of 206 and 128 kJ mol?1 for the MS and the MS-Ni mediums, respectively. The experimental results clearly validated the role of MS-Ni as a synergistic medium for high-quality syngas production from cellulosic biomass pyrolysis.

Sakhon Ratchahat; Satoshi Kodama; Wiwut Tanthapanichakoon; Hidetoshi Sekiguchi

2014-01-01T23:59:59.000Z

377

Use of coal as fuel for chemical-looping combustion with Ni-based oxygen carrier  

SciTech Connect (OSTI)

Chemical-looping combustion is an indirect combustion technology with inherent separation of the greenhouse gas CO{sub 2}. The feasibility of using NiO as an oxygen carrier during chemical-looping combustion of coal has been investigated experimentally at 800-960{degree}C in the present work. The experiments were carried out in a fluidized bed, where the steam acted as the gasification-fluidization medium. Coal gasification and the reaction of oxygen carrier with the water gas take place simultaneously in the reactor. The oxygen carrier particles exhibit high reactivity above 900{degree}C, and the dry basis concentration of CO{sub 2} in the exit gas of the reactor is nearly 95%. The flue gas composition as a function of the reactor temperature and cyclic reduction number is discussed. At 800-960{degree}C, the dry basis concentration of CO{sub 2} in the flue gas presents a monotonously increasing trend, whereas the dry basis concentration of CO, H{sub 2}, and CH{sub 4} decreases monotonously. The concentrations of CO{sub 2}, CO, H{sub 2}, and CH{sub 4} in the flue gas as a function of cyclic reduction number present a para-curve characteristic at 900{degree}C. With the increase of cyclic reduction number, the dry basis concentration of CO{sub 2} decreases remarkably, while the dry basis concentrations of CO, H{sub 2}, and CH{sub 4} increase rapidly. Moreover, the peak value of H{sub 2} concentration is less than that of CO. The performance of the NiO-based oxygen carriers was also evaluated using an X-ray diffractometer and a scanning electron microscope to characterize the solid residues of oxygen carrier. The results indicate that NiO is one of the suitable oxygen carriers for chemical-looping combustion of coal.

Gao, Z.P.; Shen, L.H.; Xiao, J.; Qing, C.J.; Song, Q.L. [Southeast University, Nanjing (China). Thermoenergy Engineering Research Institute

2008-12-15T23:59:59.000Z

378

Ultrathin highly uniform Ni(Al) germanosilicide layer with modulated B8 type Ni{sub 5}(SiGe){sub 3} phase formed on strained Si{sub 1?x}Ge{sub x} layers  

SciTech Connect (OSTI)

We present a method to form ultrathin highly uniform Ni(Al) germanosilicide layers on compressively strained Si{sub 1?x}Ge{sub x} substrates and their structural characteristics. The uniform Ni(Al) germanosilicide film is formed with Ni/Al alloy at an optimized temperature of 400?°C with an optimized Al atomic content of 20?at.?%. We find only two kinds of grains in the layer. Both grains show orthogonal relationship with modified B8 type phase. The growth plane is identified to be (10-10)-type plane. After germanosilicidation the strain in the rest Si{sub 1?x}Ge{sub x} layer is conserved, which provides a great advantage for device application.

Liu, Linjie; Xu, Dawei [Peter Grünberg Institute 9, Forschungzentrum Jülich, 52425 Jülich (Germany) [Peter Grünberg Institute 9, Forschungzentrum Jülich, 52425 Jülich (Germany); State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS, Shanghai 200050 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Jin, Lei [Peter Grünberg Institute 5, Forschungszentrum Jülich, 52425 Jülich (Germany)] [Peter Grünberg Institute 5, Forschungszentrum Jülich, 52425 Jülich (Germany); Knoll, Lars; Wirths, Stephan; Nichau, Alexander; Buca, Dan; Mussler, Gregor; Holländer, Bernhard; Zhao, Qing-Tai, E-mail: q.zhao@fz-juelich.de; Mantl, Siegfried [Peter Grünberg Institute 9, Forschungzentrum Jülich, 52425 Jülich (Germany)] [Peter Grünberg Institute 9, Forschungzentrum Jülich, 52425 Jülich (Germany); Feng Di, Zeng; Zhang, Miao [State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS, Shanghai 200050 (China)] [State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS, Shanghai 200050 (China)

2013-12-02T23:59:59.000Z

379

Status of solubility data for selected elements (U, Mp, Pu, Am, Te, Ni, and Zr)  

SciTech Connect (OSTI)

This report is an evaluation of solubility data for U, Np, Pu, Am, Tc, Ni and Zr compounds at ambient and elevated temperatures. We review the status of such data in light of the most recently reported experimental results. The focus is on the solid phases that may control solubilities under expected conditions in and near a potential nuclear waste repository at Yucca Mountain, Nevada. Solubility data or reliable predictions over the temperature range 20 to 150{degrees}C will be used in geochemical modeling studies of the Yucca Mountain Project [96PAL].

Moll, H.; Brachmann, A.; Wruck, D.; Palmer, C.

1997-09-07T23:59:59.000Z

380

High-temperature oxidation of an alumina-coated Ni-base alloy  

SciTech Connect (OSTI)

Alumina coatings were applied to Ni-20Cr (wt%) using combustion chemical vapor deposition (combustion CVD). Combustion CVD is an open air deposition technique performed in a flame. The oxidation kinetics of coated and uncoated specimens were measured by isothermal oxidation tests carried out in pure flowing air at temperatures of 800, 900, 1,000 and 1,100 C. The alumina coatings reduced the oxidation kinetics at all temperatures. The morphologies and compositions of the alumina coatings were characterized by transmission and scanning electron microscopy, energy dispersive x-ray spectroscopy and x-ray photoelectron spectroscopy.

Hendrick, M.R.; Hampikian, J.M.; Carter, W.B.

1996-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

Lambda Hyperons in 2 A*GeV Ni + Cu Collisions  

E-Print Network [OSTI]

A sample of Lambda's produced in 2 A*GeV Ni + Cu collisions has been obtained with the EOS Time Projection Chamber at the Bevalac. Low background in the invariant mass distribution allows for the unambiguous demonstration of Lambda directed flow. The transverse mass spectrum at mid-rapidity has the characteristic shoulder-arm shape of particles undergoing radial transverse expansion. A linear dependence of Lambda multiplicity on impact parameter is observed, from which a total Lambda + Sigma^0 production cross section of $112 +/- 24 mb is deduced. Detailed comparisons with the ARC and RVUU models are made.

EOS Collaboration; M. Justice; S. Albergo; F. Bieser; F. P. Brady; Z. Caccia; D. A. Cebra; A. D. Chacon; J. L. Chance; Y. Choi; S. Costa; J. B. Elliott; M. L. Gilkes; J. A. Hauger; A. S. Hirsch; E. L. Hjort; A. Insolia; D. Keane; J. C. Kintner; M. A. Lisa; H. Liu; H. S. Matis; R. McGrath; M. McMahan; C. McParland; D. L. Olson; M. D. Partlan; N. T. Porile; R. Potenza; G. Rai; J. O. Rasmussen; H. G. Ritter; J. Romanski; J. L. Romero; G. V. Russo; R. P. Scharenberg; A. Scott; Y. Shao; B. K. Srivastava; T. J. M. Symons; M. Tincknell; C. Tuve; S. Wang; P. G. Warren; D. Weerasundara; H. H. Wieman; T. Wienold; K. Wolf

1998-09-09T23:59:59.000Z

382

Chemical probes of metal cluster structure--Fe, Co, Ni, and Cu  

SciTech Connect (OSTI)

Chemical reactivity is one of the few methods currently available for investigating the geometrical structure of isolated transition metal clusters. In this paper we summarize what is currently known about the structures of clusters of four transition metals, Fe, Co, Ni, and Cu, in the size range from 13 to 180 atoms. Chemical probes used to determine structural information include reactions with H{sub 2}(D{sub 2}), H{sub 2}0, NH{sub 3} and N{sub 2}. Measurements at both low coverage and at saturation are discussed.

Parks, E.K.; Zhu, L.; Ho, J.; Riley, S.J.

1992-09-01T23:59:59.000Z

383

Chemical probes of metal cluster structure--Fe, Co, Ni, and Cu  

SciTech Connect (OSTI)

Chemical reactivity is one of the few methods currently available for investigating the geometrical structure of isolated transition metal clusters. In this paper we summarize what is currently known about the structures of clusters of four transition metals, Fe, Co, Ni, and Cu, in the size range from 13 to 180 atoms. Chemical probes used to determine structural information include reactions with H{sub 2}(D{sub 2}), H{sub 2}0, NH{sub 3} and N{sub 2}. Measurements at both low coverage and at saturation are discussed.

Parks, E.K.; Zhu, L.; Ho, J.; Riley, S.J.

1992-01-01T23:59:59.000Z

384

Laser Cladding of Ni-WC Layers with Graded WC Content  

Science Journals Connector (OSTI)

Abstract Coating techniques using powder as added material can be adapted for the manufacture of composition gradients if a mixing unit is included in the powder feed system. As for the laser cladding technology, FGM can be obtained if mixing parameters are changed along the process. This work deals with the development of NiCrBSi layers with WC graded composition. The purpose is to obtain longitudinal compositional gradients within distances of millimeters along a laser scan. To accomplish this task, the capabilities and time delays in the feeding system are identified and analyzed. Preliminar tests on single cladding beads show results in reasonable agreement with expectations.

J.M. Amado; J. Montero; M.J. Tobar; A. Yáñez

2014-01-01T23:59:59.000Z

385

Model for projectile fragmentation: case study for Ni on Ta, Be and Xe on Al  

E-Print Network [OSTI]

For projectile fragmentation we work out details of a model whose origin can be traced back to the Bevalac era. The model positions itself between the phenomenological EPAX parametrization and microscopic transport models like "Heavy Ion Phase Space Exploration Model" (HIPSE) and antisymmetrised molecular dynamics(AMD). We apply the model to some recent data of projectile fragmentation of Ni on Ta and Be at beam energy 140 MeV/nucleon and some older data of Xe on Al at beam energy 790 MeV/nucleon. Reasonable values of cross-sections for various composites populated in the reactions are obtained.

S. Mallik; G. Chaudhuri; S. Das Gupta

2010-12-30T23:59:59.000Z

386

Sediment-water exchange of Mn, Fe, Ni and Zn in Galveston Bay, Texas  

Science Journals Connector (OSTI)

In-situ benthic flux studies were conducted at three stations in Upper Galveston Bay twice during March 1996 to directly measure release rates of dissolved Mn, Fe, Ni and Zn from the sediments. Results showed reproducible increases with time in both replicate light and light–dark benthic chambers, resulting in average fluxes of ?1200±780, ?17±12, ?1.6±0.6 and ?2.4±0.79 ?mol m?2 day?1 for Mn, Fe, Ni and Zn, respectively. Sediment cores collected during 1994–1996 showed that surficial pore water concentrations were elevated compared to overlying water column concentrations, suggesting diffusive release from the sediments. Diffusive flux estimates of Mn and Zn agreed in direction with chamber fluxes measured on the same date, but only accounted for 5–38% of the measured flux. Diffusive fluxes of Fe agreed with measured fluxes at the near Trinity River station but overestimated actual release in the mid and outer Trinity Bay regions, possibly due to inaccurate determination of the Fe pore water gradients or rapid oxidation processes in the overlying water at these stations. In general, measured fluxes of Mn and Ni were higher in the mid Trinity Bay region and suggested a mechanism for the elevated trace metal concentrations previously reported for this region of Galveston Bay. However, the fluxes of Fe were highest in close proximity to the Trinity River, supporting the elevated Fe concentrations measured in this region during this and other studies, and decreased towards middle and outer Trinity Bay. Trace metal turnover times were between 0.1 and 1.2 days for Mn, between 1.3 and 4.6 days for Fe, and between 27 and 100 days for Ni and 12–20 days Zn, and were considerably shorter than the average Trinity Bay water residence time (1.5 years) for this period. Comparing area averaged benthic inputs to Trinity River inputs shows the sediments to be a significant source of trace metals to Galveston Bay. However, while benthic inputs of trace metals were measured, water column concentrations remained low despite rapid turnover times for Mn and Fe, suggesting removal of these metals from the water column after release from the sediments.

Kent W Warnken; Gary A Gill; Lawrence L Griffin; Peter H Santschi

2001-01-01T23:59:59.000Z

387

First principles approach to the magneto caloric effect: Application to Ni2MnGa  

SciTech Connect (OSTI)

The magneto-caloric effect (MCE) is a possible route to more efficient heating and cooling of residential and commercial buildings. The search for improved materials is important to the development of a viable MCE based heat pump technology. We have calculated the magnetic structure of a candidate MCE material: Ni2MnGa. The density of magnetic states was calculated with the Wang Landau statistical method utilizing energies fit to those of the locally self-consistent multiple scattering method. The relationships between the density of magnetic states and the field induced adiabatic temperature change and the isothermal entropy change are discussed. (C) 2011 American Institute of Physics.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Rusanu, Aurelian [ORNL; Eisenbach, Markus [ORNL; Brown, Greg [ORNL; Evans III, Boyd Mccutchen [ORNL

2011-01-01T23:59:59.000Z

388

Kondo Effect in an Amorphous Ni41Pd41B18 Alloy Containing Cr  

Science Journals Connector (OSTI)

The results of electrical-resistivity-vs-temperature measurements on an amorphous Ni41 Pd41 B18 alloy containing up to 4-at.% Cr exhibits the characteristics of a Kondo system. The experimental data are used to make a comparison between the Kondo theory and the Hamann theory. It is found that both theories agree very well on the slope of logarithmic temperature dependence of the s-d resistivity. In terms of a universal resistivity curve, the Hamann theory comes to closer agreement with the experimental data in a wider temperature range than does the Kondo theory.

V. K. C. Liang and C. C. Tsuei

1973-04-01T23:59:59.000Z

389

Excitation of the giant quadrupole resonance in /sup 58/Ni with /sup 20/Ne  

E-Print Network [OSTI]

The heavy-ion induced excitation of the quadrupole resonance in /sup 58/Ni has been studied with /sup 20/Ne beams of 14.5 and 19.6 MeV/N incident energy. The broad resonance structure is clearly observed; the strength exhausts 44% and 60% of the energy weighted sum rule (EWSR) at the two incident energies, respectively. The background is partly explained by a three-body reaction mechanism, which is based on the one-nucleon pick-up reaction into unbound states followed by one- nucleon emission. The remaining part is interpreted as inelastic excitation of other multipoles. (11 refs).

Bohlen, H G; Ingold, G; Lettau, H; Ossenbrink, H; von Oertzen, W

1981-01-01T23:59:59.000Z

390

Electronic structure, magnetism, and superconductivity of MgCxNi3  

Science Journals Connector (OSTI)

The electronic structure of the newly discovered superconducting perovskite MgCNi3 is calculated using the LMTO method. The states near the Fermi energy are found to be dominated by Ni-d. The Stoner factor is low while the electron-phonon coupling constant is estimated to be about 0.5, which suggests that the material is a conventional type of superconductor where Tc is not affected by magnetic interactions. However, the proximity of the Fermi energy to a large peak in the density of states in conjunction with the reported nonstoichiometry of the compound has consequences for the stability of the results.

S. B. Dugdale and T. Jarlborg

2001-08-22T23:59:59.000Z

391

Effect of excess lithium on LiNi0.5Mn0.5O2+? and its electrochemistry as lithium insertion material  

Science Journals Connector (OSTI)

Layered Li–Ni–Mn–O compounds were successfully synthesized by an emulsion drying method, in which the emulsion makes it possible to intermix cations in atomic scale and therefore leads to homogeneous and fine oxide products. The as-synthesized powders were crystallized into a well-ordered ?-NaFeO2 (R3? m) structure. The calculated lattice parameters varied by changing the lithium amounts. The lattice parameters of Li1.13Ni0.5Mn0.5O2+z showed smaller a- and c-axes comparing to those of the LiNi0.5Mn0.5O2, whereas the c/a ratio remained constant for Li1+xNi0.5Mn0.5O2+z (0?x?0.13) compounds. Comparing to LiNi0.5Mn0.5O2 and Li1+xNi0.5Mn0.5O2+z electrodes, the delivered capacity for the Li1.13Ni0.5Mn0.5O2+z was much higher that that of the LiNi0.5Mn0.5O2. The lithium excess Li1+xNi0.5Mn0.5O2+z sample exhibited very stable cyclability with high capacity of about 175 mA h (g oxide)?1 after the 50th cycle at 25 °C (I=20 mA g?1) and 50 °C (75.5 mA g?1), which indicates that structural stability of the lithium excess Li1+xNi0.5Mn0.5O2+z is superior to that of the stoichiometric LiNi0.5Mn0.5O2.

Seung-Taek Myung; Shinichi Komaba; Naoaki Kumagai

2004-01-01T23:59:59.000Z

392

The Role of FeS in Initial Activation and Performance Degradation of Na-NiCl2 Batteries  

SciTech Connect (OSTI)

The role of iron sulfide (FeS) in initial cell activation and degradation in the Na-NiCl2 battery was investigated in this work. The research focused on identifying the effects of the FeS level on the electrochemical performance and morphological changes in the cathode. The x-ray photoelectron spectroscopy study along with battery tests revealed that FeS plays a critical role in initial battery activation by removing passivation layers on Ni particles. It was also found that the optimum level of FeS in the cathode resulted in minimum Ni particle growth and improved battery cycling performance. The results of electrochemical characterization indicated that sulfur species generated in situ during initial charging, such as polysulfide and sulfur, are responsible for removing the passivation layer. Consequently, the cells containing elemental sulfur in the cathode exhibited similar electrochemical behavior during initial charging compared to that of the cells containing FeS.

Li, Guosheng; Lu, Xiaochuan; Kim, Jin Yong; Engelhard, Mark H.; Lemmon, John P.; Sprenkle, Vincent L.

2014-12-25T23:59:59.000Z

393

Interface control of ferroelectricity in LaNiO{sub 3}-BaTiO{sub 3} superlattices  

SciTech Connect (OSTI)

LaNiO{sub 3}-BaTiO{sub 3} superlattices with different types of interfaces are studied from first-principles density-functional theory. It is revealed that the ferroelectricity in the superlattice with (NiO{sub 2}){sup ?}/(BaO){sup 0} interfaces is enhanced from that of the superlattice with (LaO){sup +}/(TiO{sub 2}){sup 0} interfaces. The origin lies at the polar discontinuity at the interface, which makes the holes localized within the (NiO{sub 2}){sup ?}/(BaO){sup 0} interface, but drives a penetration of electrons into BaTiO{sub 3} component near (LaO){sup +}/(TiO{sub 2}){sup 0} interface. Our calculations demonstrate an effective avenue to the robust ferroelectricity in BaTiO{sub 3} ultrathin films.

Wu, Yin-Zhong, E-mail: yzwu@cslg.edu.cn [Jiangsu Laboratory of Advanced Functional Materials and Physics Department, Changshu Institute of Technology, Changshu 215500 (China); School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009 (China); Lu, Hai-Shuang; Cai, Tian-Yi; Ju, Sheng, E-mail: jusheng@suda.edu.cn [Department of Physics and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006 (China)

2014-08-15T23:59:59.000Z

394

Morphological Stability and Specific Resistivity of sub-10 nm Silicide Films of Ni1 xPtx on Si Substrate  

SciTech Connect (OSTI)

This letter studies the morphological stability and specific resistivity of sub-10 nm silicide films of Ni, Ni{sub 0.95}Pt{sub 0.05}, and Ni{sub 0.9}Pt{sub 0.1} formed on Si(100) substrate. When the deposited metal films are below 1 to 4 nm in thickness depending on the Pt content, the resultant silicide films tend to become epitaxially aligned to the Si substrate and hence exhibit an extraordinary morphological stability up to 800 C. The presence of Pt in the silicides increases the film resistivity through alloy scattering, but alleviates, owing to a reduced electron mean free path, the frequently encountered sharp increase in resistivity in the sub-10 nm regime.

Zhang, Z.; Zhang, S; Yang, B; Zhu, Y; Rossnagel, S; Gaudet, S; Kellock, A; Jordan-Sweet, J; Lavoie, C

2010-01-01T23:59:59.000Z

395

Effect of electronic structures on catalytic properties of CuNi alloy and Pd in MeOH-related reactions  

SciTech Connect (OSTI)

We investigated the catalytic properties of a CuNi solid solution and Pd for methanol-related reactions and associated valence electronic structures. Calculations and X-ray photoelectron spectroscopy measurements revealed that the CuNi alloy has a similar valence electronic structure to Pd and hence they exhibited similar CO selectivities in steam reforming of methanol and decomposition of methanol. Samples prepared by various processes were found to have similar CO selectivities. We conjecture that alloying of Cu and Ni dramatically alters the valence electronic structures, making it similar to that of Pd so that the alloy exhibits similar catalytic properties to Pd. First-principles slab calculations of surface electronic structures support this conjecture.

Tsai, An-Pang [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan); National Institute for Materials Science, Tsukuba 305-0047 (Japan); Kimura, Tomofumi; Suzuki, Yukinori; Kameoka, Satoshi [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan); Shimoda, Masahiko [National Institute for Materials Science, Tsukuba 305-0047 (Japan); Ishii, Yasushi [Department of Physics, Chuo University, Kasuga, Tokyo 112-8551 (Japan)

2013-04-14T23:59:59.000Z

396

NiTi shape-memory transformations: minimum-energy pathways between austenite, martensites, and kinetically-limited intermediate states  

E-Print Network [OSTI]

NiTi is the most used shape-memory alloy, nonetheless, a lack of understanding remains regarding the associated structures and transitions, including their barriers. Using a generalized solid-state nudge elastic band (GSSNEB) method implemented via density-functional theory, we detail the structural transformations in NiTi relevant to shape memory: those between body-centered orthorhombic (BCO) groundstate and a newly identified stable austenite ("glassy" B2-like) structure, including energy barriers (hysteresis) and intermediate structures (observed as a kinetically limited R-phase), and between martensite variants (BCO orientations). All results are in good agreement with available experiment. We contrast the austenite results to those from the often-assumed, but unstable B2. These high- and low-temperature structures and structural transformations provide much needed atomic-scale detail for transitions responsible for NiTi shape-memory effects.

Zarkevich, N A

2014-01-01T23:59:59.000Z

397

Ru/Ni/MgAl2O4 catalysts for steam reforming of methane: effects of Ru content on self-activation property  

Science Journals Connector (OSTI)

The effects of Ru on the self-reducibility of Ru-doped Ni/MgAl2O4 catalysts, which do not need pre-reduction treatment with H2, were investigated in the steam reforming of methane (SRM). The Ru-promoted Ni/MgAl2O

Seung-Chan Baek; Ki-Won Jun; Yun-Jo Lee; Jae Dong Kim…

2012-04-01T23:59:59.000Z

398

Magnetic order in the frustrated Ising-like chain compound Sr3NiIrO6 E. Lefranois,1, 2, 3,  

E-Print Network [OSTI]

Magnetic order in the frustrated Ising-like chain compound Sr3NiIrO6 E. Lefrançois,1, 2, 3, L. C and temperature dependence of the magnetization of single crystals of Sr3NiIrO6. These measurements evidence the presence of an easy axis of anisotropy and two anomalies in the magnetic susceptibility. Neutron powder

Boyer, Edmond

399

Magnetic phase diagram of the S=1/2 triangular layered compound NaNiO2: a single crystal study  

E-Print Network [OSTI]

Magnetic phase diagram of the S=1/2 triangular layered compound NaNiO2: a single crystal study S de Magnetic Field Laboratory, CNRS, BP166, F-38042 Grenoble cedex 9, France Abstract. Using magnetic torque measurement on a NaNiO2 single crystal, we have established the magnetic phase diagram of this triangular

Boyer, Edmond

400

Free-Standing LiNi0.5Mn1.5O4/Carbon Nanofiber Network Film as Light-Weight and High-Power  

E-Print Network [OSTI]

Free-Standing LiNi0.5Mn1.5O4/Carbon Nanofiber Network Film as Light-Weight and High-Power Cathode Pure carbon nanofiber (CNF) network without LiNi0.5Mn1.5O4 was tested in the voltage window of 3.5-5 V

Zhou, Chongwu

Note: This page contains sample records for the topic "ura ni um" 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

RETRACTED ARTICLE: Effect of Gd2O3 over Ni/SiO2 on syngas production via methane autothermal reforming  

Science Journals Connector (OSTI)

Gd2O3-promoted Ni/SiO2 catalysts exhibited higher activity and selectivity than Ni/SiO2 in methane autothermal reforming. The results of the temperature-programmed surface reaction of CH4 indicated that Gd2O3 mig...

Jian-Zhong Guo; Zhao-Yin Hou…

2010-10-01T23:59:59.000Z

402

Adsorption of Ni(II) on oxidized multi-walled carbon nanotubes: Effect of contact time, pH, foreign ions and PAA  

Science Journals Connector (OSTI)

The adsorption of Ni(II) on oxidized multi-walled carbon nanotubes (MWCNTs) as a function of contact time, pH and foreign ions in the absence and presence of polyacrylic acid (PAA) was studied using batch technique. The results indicated that adsorption of Ni(II) on oxidized \\{MWCNTs\\} increased from zero to ?99% at pH 2–9, and then maintained the high level with increasing pH. Kinetic data showed that the adsorption process achieved equilibrium within 2 h and experimental data were fitted well by the pseudo-second-order equation. A positive effect of PAA on Ni(II) adsorption was found at pH  8. The effect of addition sequences of PAA/Ni(II) on the adsorption of Ni(II) to PAA–MWCNT hybrids were also studied. The results indicated that the adsorption of Ni(II) was influenced by addition sequences obviously. The adsorption of Ni(II) on oxidized \\{MWCNTs\\} may be mainly attributed to surface complexation and ion exchange. Oxidized \\{MWCNTs\\} are suitable material in the solidification and pre-concentration of Ni(II) from aqueous solutions.

Shitong Yang; Jiaxing Li; Dadong Shao; Jun Hu; Xiangke Wang

2009-01-01T23:59:59.000Z

403

Oxygen diffusion, surface exchange and oxygen semi-permeation performances of Ln2NiO4+ membranes (Ln = La, Pr and Nd)  

E-Print Network [OSTI]

Oxygen diffusion, surface exchange and oxygen semi-permeation performances of Ln2NiO4+ membranes the rate determining step (rds) in oxygen semi-permeation of dense Ln2NiO4+ membranes (with Ln = La, Pr and Nd), a specific setup has been designed, which allowed measuring the oxygen semi-permeation flux

Paris-Sud XI, Université de

404

In situ transmission electron microscopy investigation of the interfacial reaction between Ni and Al during rapid heating in a nanocalorimeter  

SciTech Connect (OSTI)

The Al/Ni formation reaction is highly exothermic and of both scientific and technological significance. In this report, we study the evolution of intermetallic phases in this reaction at a heating rate of 830 K/s. 100-nm-thick Al/Ni bilayers were deposited onto nanocalorimeter sensors that enable the measurement of temperature and heat flow during rapid heating. Time-resolved transmission electron diffraction patterns captured simultaneously with thermal measurements allow us to identify the intermetallic phases present and reconstruct the phase transformation sequence as a function of time and temperature. The results show a mostly unaltered phase transformation sequence compared to lower heating rates.

Grapes, Michael D., E-mail: mgrapes1@jhu.edu, E-mail: david.lavan@nist.gov, E-mail: weihs@jhu.edu [Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218 (United States); Material Measurement Laboratory, Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); LaGrange, Thomas; Reed, Bryan W.; Campbell, Geoffrey H. [Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, California 94550 (United States); Woll, Karsten [Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218 (United States); Institute of Applied Materials, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen (Germany); LaVan, David A., E-mail: mgrapes1@jhu.edu, E-mail: david.lavan@nist.gov, E-mail: weihs@jhu.edu [Material Measurement Laboratory, Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Weihs, Timothy P., E-mail: mgrapes1@jhu.edu, E-mail: david.lavan@nist.gov, E-mail: weihs@jhu.edu [Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218 (United States)

2014-11-01T23:59:59.000Z

405

Electron-Transport Properties of Amorphous (Zr0.64ni0.36)1-Xalx Alloys  

E-Print Network [OSTI]

-4242 (Received 28 November 1988; revised manuscript received 16 March 1989) Measurements of the electrical resistivity p(T), thermopower S(T), and Hall coe%cient RH for a series of rapidly quenched Zr-Ni-Al alloys are reported for concentrations from x =0 to 0...-metal or ?metalloid amorphous alloys, the sign of RH can change from positive to negative as the concentration of the early transition metal is decreased. This is particular- ly well illustrated by measurements on amorphous Zr- based alloys, Zr-Cu, ' ' Zr-Ni, ' Zr...

BHATNAGAR, AK; PAN, R.; Naugle, Donald G.

1989-01-01T23:59:59.000Z

406

Temperature dependence of dynamic Young's modulus and internal friction in three plasma sprayed NiCrAlY coating alloys  

E-Print Network [OSTI]

TEMPERATURE DEPENDENCE OF DYNAM'IIC YOUNG'S MODULUS AND INTERNAL FRICTION IN THREE PLASMA SPRAYED NiCrAlY COATING -ALLOYS A Thesis LLOYD STEVEN COOK Submitted to the 08ice of Graduate Studies of Texas AE M University in part. al full...'illment of the requirement for the degree of MASTER OF SCIENCE August 1989 Itiajor Subject: l'dechanical Engineering TEMPERATURE DEPENDENCE OF DYNAMIC YOUNG'S MODULUS AND INTERNAL FRICTION IN THREE PLASMA SPRAYED NiCrAIY COATING ALLOYS A Thesis by LLOYD STEVEN COOK...

Cook, Lloyd Steven

1989-01-01T23:59:59.000Z

407

Sulfur behavior in chemical looping combustion with NiO/Al{sub 2}O{sub 3} oxygen carrier  

SciTech Connect (OSTI)

Chemical looping combustion (CLC) is a novel technology where CO{sub 2} is inherently separated during combustion. Due to the existence of sulfur contaminants in the fossil fuels, the gaseous products of sulfur species and the interaction of sulfur contaminants with oxygen carrier are a big concern in the CLC practice. The reactivity of NiO/Al{sub 2}O{sub 3} oxygen carrier reduction with a gas mixture of CO/H{sub 2} and H{sub 2}S is investigated by means of a thermogravimetric analyzer (TGA) and Fourier Transform Infrared spectrum analyzer in this study. An X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscope (SEM) are used to evaluate the phase characterization of reacted oxygen carrier, and the formation mechanisms of the gaseous products of sulfur species are elucidated in the process of chemical looping combustion with a gaseous fuel containing hydrogen sulfide. The results show that the rate of NiO reduction with H{sub 2}S is higher than the one with CO. There are only Ni and Ni{sub 3}S{sub 2} phases of nickel species in the fully reduced oxygen carrier, and no evidence for the existence of NiS or NiS{sub 2}. The formation of Ni{sub 3}S{sub 2} is completely reversible during the process of oxygen carrier redox. A liquid phase sintering on the external surface of reduced oxygen carriers is mainly attributed to the production of the low melting of Ni{sub 3}S{sub 2} in the nickel-based oxygen carrier reduction with a gaseous fuel containing H{sub 2}S. Due to the sintering of metallic nickel grains on the external surface of the reduced oxygen carrier, further reaction of the oxygen carrier with H{sub 2}S is constrained, and there is no increase of the sulfidation index of the reduced oxygen carrier with the cyclical reduction number. Also, a continuous operation with a syngas of carbon monoxide and hydrogen containing H{sub 2}S is carried out in a 1 kW{sub th} CLC prototype based on the nickel-based oxygen carrier, and the effect of the fuel reactor temperature on the release of gaseous products of sulfur species is investigated. (author)

Shen, Laihong; Gao, Zhengping; Wu, Jiahua; Xiao, Jun [Thermoenergy Engineering Research Institute, Southeast University, Nanjing 210096 (China)

2010-05-15T23:59:59.000Z

408

Calculations for Ni-like soft x-ray lasers: Optimization for W (43.1 A?)  

Science Journals Connector (OSTI)

Near-optimum conditions for lasing in Ni-like W are calculated for a 90-?g/cm2 foil irradiated by a 2? (?=0.53 ?m), 2.3×1014-W/cm2, 550-ps trapezoidal pulse. The gain coefficient for the J=0–1, 4d-4p Ni-like transition at 43.1 A? is predicted to be 5.5 cm-1. The electron density and temperature are 2.5×1021 cm-3 and 860 eV at x-ray laser time.

S. Maxon; S. Dalhed; P. L. Hagelstein; R. A. London; B. J. MacGowan; M. D. Rosen; G. Charatis; G. Busch

1989-07-17T23:59:59.000Z

409

Bridge structure for the graphene/Ni(111) system: A first principles study  

Science Journals Connector (OSTI)

The structure of graphene on Ni(111) is studied with density functional theory (DFT). Six different structures, i.e., top-fcc, top-hcp, hcp-fcc, bridge-top, bridge-fcc, and bridge-hcp, were investigated. Bridge-top, bridge-fcc, and bridge-hcp are studied here. Top-fcc and hcp-fcc have been considered before, experimentally and theoretically, and regarded as energetically stable structures. The calculations employed the local density approximation (LDA) and the Perdew, Burke, and Ernzerhof (PBE) generalized-gradient approximation to DFT. The results showed that with PBE, none of the structures is stable at the experimentally relevant temperatures; with LDA, only bridge-top and top-fcc are stable. These findings suggest that it will be worthwhile to carry on new experimental studies to revisit the structural determination of the graphene/Ni(111) system, with special emphasis on testing whether bridge-top could exist by itself or coexist with other structures.

Miguel Fuentes-Cabrera; M. I. Baskes; Anatoli V. Melechko; Michael L. Simpson

2008-01-04T23:59:59.000Z

410

Bridge Structure for the graphene/Ni(111) system: A first principles study  

SciTech Connect (OSTI)

The structure of graphene on Ni(111) is studied with density functional theory (DFT). Six different structures, i.e., top-fcc, top-hcp, hcp-fcc, bridge-top, bridge-fcc, and bridge-hcp, were investigated. Bridge-top, bridge-fcc, and bridge-hcp are studied here. Top-fcc and hcp-fcc have been considered before, experimentally and theoretically, and regarded as energetically stable structures. The calculations employed the local density approximation (LDA) and the Perdew, Burke, and Ernzerhof (PBE) generalized-gradient approximation to DFT. The results showed that with PBE, none of the structures is stable at the experimentally relevant temperatures; with LDA, only bridge-top and top-fcc are stable. These findings suggest that it will be worthwhile to carry on new experimental studies to revisit the structural determination of the graphene/Ni(111) system, with special emphasis on testing whether bridge-top could exist by itself or coexist with other structures.

Fuentes-Cabrera, Miguel A [ORNL; Baskes, Mike I. [Los Alamos National Laboratory (LANL); Melechko, Anatoli Vasilievich [ORNL; Simpson, Michael L [ORNL

2008-01-01T23:59:59.000Z

411

Direct observation of dynamic charge stripes in La2 xSrxNiO4  

SciTech Connect (OSTI)

The insulator-to-metal transition continues to be a challenging subject, especially when electronic correlations are strong. In layered compounds, such as La2 xSrxNiO4 and La2 xBaxCuO4, the doped charge carriers can segregate into periodically spaced charge stripes separating narrow domains of antiferromagnetic order. Although there have been theoretical proposals of dynamically fluctuating stripes, direct spectroscopic evidence of charge-stripe fluctuations has been lacking. Here we report the detection of critical lattice fluctuations, driven by charge-stripe correlations, in La2 xSrxNiO4 using inelastic neutron scattering. This scattering is detected at large momentum transfers where the magnetic form factor suppresses the spin fluctuation signal. The lattice fluctuations associated with the dynamic charge stripes are narrow in q and broad in energy. They are strongest near the charge-stripe melting temperature. Our results open the way towards the quantitative theory of dynamic stripes and for directly detecting dynamical charge stripes in other strongly correlated systems, including high-temperature superconductors such as La2 xSrxCuO4.

Anissimova, S. [University of Colorado, Boulder] [University of Colorado, Boulder; Parshall, D [University of Colorado, Boulder] [University of Colorado, Boulder; Gu, Genda [Brookhaven National Laboratory (BNL)] [Brookhaven National Laboratory (BNL); Marty, K. [Oak Ridge National Laboratory (ORNL)] [Oak Ridge National Laboratory (ORNL); Lumsden, Mark D [ORNL] [ORNL; Chi, Songxue [ORNL] [ORNL; Fernandez-Baca, Jaime A [ORNL] [ORNL; Abernathy, D. [Oak Ridge National Laboratory (ORNL)] [Oak Ridge National Laboratory (ORNL); Lamago, D. [Laboratoire Leon Brillouin, France] [Laboratoire Leon Brillouin, France; Tranquada, John M. [Brookhaven National Laboratory (BNL)] [Brookhaven National Laboratory (BNL); Reznik, Dmitry [University of Colorado, Boulder] [University of Colorado, Boulder

2014-01-01T23:59:59.000Z

412

HRLEED study of the roughening transitions in Cu(110), Ni(110) and Ag(110) surfaces  

SciTech Connect (OSTI)

The authors present the results of High Resolution Low Energy Electron Diffraction (HRLEED) measurements of the thermal roughening transition on Cu(110), Ag(110) and Ni(110) surfaces. They performed careful spot profile intensity measurements as a function of temperature. They observed a proliferation of steps along the (110) and (001) directions. In addition a strong deviation from a Debye model was observed in the scattered intensity of the Bragg reflections. This deviation from the harmonic approximation occurs well below the roughening transition temperature. The behavior of the three metal surfaces is qualitatively similar except for the transition temperatures. Ni shows the highest transition temperature (1,300 K), Cu is intermediate (1,000 K) and Ag has the lowest temperature (730 K). Analyzing the behavior of the (00) reflection intensity, and the evolution of the line shape as a function of the temperature, they found clear evidence of a roughening transition at the (110) surface. A lineshape analysis of the (00) reflection shows the transition from a Lorentzian lineshape to a power law. They also proved, based on the experimental data and a recent theoretical model, that there is a tremendous increase in step density and a decrease in the average terrace size as the temperature increases. They used STM to corroborate the HRLEED results at room temperature. They found excellent agreement.

Wang, K.; Montano, P.A. [Argonne National Lab., IL (United States). Materials Science Div.]|[Univ. of Illinois, Chicago, IL (United States). Dept. of Physics

1996-12-01T23:59:59.000Z

413

Room temperature ferromagnetism in Mn, Ni and Co ions doped Cu{sub 2}O nanorods  

SciTech Connect (OSTI)

Here we report the synthesis and characterization of Cu{sub 2}O nanorods doped with Mn, Ni and Co transition metal ions and the study of their magnetic properties. Synthesis of the nanorods was carried out by the modified polyol method. Powder X-ray diffraction patterns clearly showed them to be polycrystalline single phase material. They exhibited ferromagnetic behavior at room temperature, however no such behavior was observed for the reference undoped sample, which indicated that unintentionally introduced magnetic impurities were not responsible for the observed phenomenon. Ferromagnetic behavior was found to be dependent on the dopant concentration and increased consistently with its increment in the material. The total magnetic moments contribution was calculated for the dopant concentration and was found to be insignificant to account for the observed ferromagnetism, therefore it was suggested that ferromagnetism could have conjured up from the induced magnetic moment in the defects created as cation vacancies in the material. The presence of the defects was supported by the room temperature photoluminescence study which showed that intensity of the peaks was dependent on the dopant concentration and increased consistently with it. There was strong correlation between the magnitude of the photoluminescence peak and the observed ferromagnetic property in the doped samples. -- Graphical Abstract: Room temperature ferromagnetism was observed in the Cu{sub 2}O nanorods doped with Mn, Ni and Co ions. The origin seems to be the defects of cation vacancies created by the dopant ions. Display Omitted

Ahmed, Asar [Department of Chemistry, SL-214, Southern Lab, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh (India); Gajbhiye, Namdeo S., E-mail: nsg@iitk.ac.i [Department of Chemistry, SL-214, Southern Lab, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh (India)

2010-12-15T23:59:59.000Z

414

Castability of Traditionally Wrought Ni-Based Superalloys for USC Steam Turbines  

SciTech Connect (OSTI)

The high temperature components within conventional coal fired power plants are manufactured from ferritic/martensitic steels. In order to reduce greenhouse gas emissions the efficiency of pulverized coal steam power plants must be increased. The proposed steam temperature in the Advanced Ultra Supercritical (A-USC) power plant is high enough (760°C) that ferritic/martensitic steels will not work due to temperature limitations of this class of materials; thus Ni-based superalloys are being considered. The full size castings are quite substantial: ~4in thick, several feet in diameter and weigh 5-10,000lb each half. Experimental castings were quite a bit smaller, but section size was retained and cooling rate controlled in order to produce relevant microstructures. A multi-step homogenization heat treatment was developed in order to better deploy the alloy constituents. The castability of two traditionally wrought Ni-based superalloys to which minor alloy adjustments have been made in order to improve foundry performance is further explored.

Jablonski, P D; Cowen, C J; Hawk, J A; Evens, N; Maziasz, P

2011-02-27T23:59:59.000Z

415

Microstructure and mechanical properties of Ni sub 3 Al-based alloys reinforced with particulates  

SciTech Connect (OSTI)

Hot-extrusion was used to produce Ni{sub 3}Al-based alloys to which 10 vol % TiN, NbC, HfO{sub 2}, or HfN was added for reinforcement. The TiN, NbC, and HfO{sub 2} particulates produced Ni{sub 3}Al-matrix composites in which no reaction was noted at the particle-matrix interface. However, the addition of HfN resulted in extensive reaction in which the hafnium appeared to diffuse into the matrix. Microstructures of this alloy showed a complex array of phases and voids where the HfN particles are presumed to have been originally. Hot hardness, compression, and compression creep tests were preformed on specimens cut from the extruded bar of each alloy. No significant strengthening was observed for the alloys containing TiN, NbC, or HfO{sub 2}. However the HfN-containing alloy did show significant strengthening in simple compression and compression creep. This presentation will include microstructures and the results of the mechanical properties tests. 26 refs., 5 figs.

McKamey, C.G.; Carmichael, C.A.

1990-01-01T23:59:59.000Z

416

Fast-neutron total and scattering cross sections of sup 58 Ni and nuclear models  

SciTech Connect (OSTI)

An extensive experimental and theoretical study of the fast-neutron interaction with {sup 58}Ni was undertaken. The neutron total cross sections of {sup 58}Ni were measured from {approx} 1 to > 10 MeV using white source techniques. Differential neutron elastic-scattering cross sections were measured from {approx} 4.5 to 10 MeV at {approx} 0.5 Mev intervals with {ge} 75 differential values per distribution. Differential neutron inelastic-scattering cross sections were measured, corresponding to fourteen levels with excitations up to {approx} 4.8 Mev. The measured results, combined with lower-energy values previously obtained at this laboratory and with relevant values available in the literature, were interpreted in terms of optical-statistical, dispersive-optical and coupled-channels models using both vibrational and rotational coupling schemes. The physical implications of the experimental results and their interpretation are discussed. The considerations are being extended to collective vibrational nuclei generally, exploring the potential for utilizing electro-magnetic matrix elements, deduced from experiment or predicted by the shell model, to determine the strengths of the neutron interaction. Detailed aspects of this work are given in the Laboratory Report, ANL/NDM-120 (in press). 9 refs., 10 figs.

Smith, A.B.; Guenther, P.T.; Whalen, J.F.; Lawson, R.D.; Chiba, S.

1991-01-01T23:59:59.000Z

417

Carbon migration in 5Cr-0.5Mo/21Cr-12Ni dissimilar metal welds  

SciTech Connect (OSTI)

The carbon migration between a ferritic steel and an austenitic steel was studied in submerged arc-welded 5Cr-0.5Mo/21Cr-12Ni dissimilar metal welds (DMWs) after aging at 500 C for various times and after long-term service in technical practice. The distribution of carbon, chromium, nickel, and iron in the areas around the weld interface was determined by electron probe microanalysis, and the microstructural aspect in the carbon-depleted/enriched zone was characterized by optical microscopy and transmission electron microscopy (TEM). Furthermore, the precipitation sequences and composition characteristics of the carbides were identified by diffraction pattern microanalysis and energy-dispersive X-ray (EDX) microanalysis. It was found (1) that there exists a coherent relationship between intracrystalline M{sub 23}C{sub 6} and the austenitic matrix; (2) that the composition of M{sub 23}C{sub 6} in the carbon-enriched zone is independent of the duration of aging and service; (3) that the maximum carbon concentration is determined by the carbide type, the composition characteristic of precipitated carbides, and the concentration of carbide-forming Cr adjacent to the weld interface in the carbon-enriched zone; and (4) that the carbon migration in the 5Cr-0.5Mo/21Cr-12Ni DMWs can be described by a diffusion model.

Huang, M.L.; Wang, L. [Dalian Univ. of Technology (China). Dept. of Materials Engineering

1998-12-01T23:59:59.000Z

418

Localized Corrosion of a Neutron Absorbing Ni-Cr-Mo-Gd Alloy  

SciTech Connect (OSTI)

The National Spent Nuclear Fuel Program, located at the Idaho National Laboratory (INL), has developed a new nickel-chromium-molybdenum-gadolinium structural alloy for storage and long-term disposal of spent nuclear fuel (SNF). The new alloy will be used for SNF storage container inserts for nuclear criticality control. Gadolinium has been chosen as the neutron absorption alloying element due to its high thermal neutron absorption cross section. This alloy must be resistant to localized corrosion when exposed to postulated Yucca Mountain in-package chemistries. The corrosion resistance properties of three experimental heats of this alloy are presented. The alloys performance are be compared to Alloy 22 and borated stainless steel. The results show that initially the new Ni-Cr-Mo-Gd alloy is less resistant to corrosion as compared to another Ni-Cr-Mo-Gd alloy (Alloy 22); but when the secondary phase that contains gadolinium (gadolinide) is dissolved, the alloy surface becomes passive. The focus of this work is to qualify these gadolinium containing materials for ASME code qualification and acceptance in the Yucca Mountain Repository.

R.E. Mizia; T. E. Lister; P. J. Pinhero; T. L. Trowbridge

2005-04-01T23:59:59.000Z

419

Electrochemical studies of hydrogen storage in amorphous Ni[sub 64]Zr[sub 36] alloy  

SciTech Connect (OSTI)

The capacity of amorphous Ni-Zr alloys to absorb large amounts of hydrogen has been investigated recently in connection with their possible use for hydrogen storage. This property also makes them possible candidates as anodes in metal hydride-nickel hydroxide rechargeable batteries. The characteristic features of the electrochemical behavior of the amorphous Ni[sub 64]Zr[sub 36] alloy in alkaline media have been investigated. Changes occurring in both the physical state and the composition of the surface layer during chemical etching and electrochemical activation were studied by scanning electron microscopy, Auger electron spectroscopy, x-ray diffraction, and cyclic voltammetry. The kinetics of the hydrogen evolution reaction (HER) on the alloy under investigation was studied in terms of the cathodic polarization curves. The Tafel plots contain two different ranges: (i) a low-overpotential range, in which the slope of the linear [eta] versus log i is characteristic for charge transfer controlled processes; (ii) a high-overvoltage range, in which a combined mechanism, charge transfer and hydrogen diffusion into the bulk, is operative. To get information about the parameters influencing the hydrogen charging and discharging processes, chronopotentiometric experiments were performed. The changes of anodic overvoltage with time during constant current discharge were used to determine the electrochemical parameters i[sub 0] and [beta], as well as the diffusion coefficients (D) of the H atoms in the bulk of the alloy.

Ciureanu, M.; Ryan, D.H.; Stroem-Olsen, J.O. (McGill Univ., Montreal, Quebec (Canada)); Trudeau, M.L. (Hydro Quebec Research Inst., Varennes (Canada))

1993-03-01T23:59:59.000Z

420

Seat Belt Use Policy Outline the policy regarding use of seat belt in University of Michigan (U-M) vehicles.  

E-Print Network [OSTI]

are as follows: a. All occupants in the front seat of the vehicle are required to wear a seat belt. b. Children according to U-M policies and Federal, State and local laws. Policy 1. Operators are required to wear a seat they are over 4'9" tall. c. Children who are 8 years old but less than 16 years old are required to wear a seat

Kirschner, Denise

Note: This page contains sample records for the topic "ura ni um" from the National Library of EnergyBeta (NLEBeta).
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421

JOURNAL DE PHYSIQUE Colloque C I, supplkment au no 2-3, Tome 32, Fkvrier-Mars 1971, page C 1 -882 MAGNETIC NEUTRON SCATTERING FROM K,NiF4  

E-Print Network [OSTI]

la temperature de tran- sition dans I'antiferromagnetique a deux dimensions K2NiF4. L in the two-dimensional antiferromagnet K2NiF4. Inelastic studies on a triple-axis spectrometer have indicated is structurally composed of NiF, layers separated by two K F layers [I]. The relative isolation of the NiF, layers

Paris-Sud XI, Université de

422

Magnetic susceptibility contributions and electronic density of states in (Ti,Zr)100?x(Ni,Cu)x metallic glasses and crystalline compounds  

Science Journals Connector (OSTI)

Available experimental data on the magnetic susceptibility of melt-quenched amorphous TE-TL alloys (TE=Ti or Zr; TL=Ni or Cu) and the corresponding crystalline counterparts are reviewed. In order to analyze the composition dependence of the magnetic susceptibility in these systems, the individual contributions (element-resolved Langevin diamagnetic, Van Vleck and Pauli spin susceptibility, as well as the Landau susceptibility) were determined directly by theoretical calculations for these TE-TL alloys in a face-centered-cubic (fcc) structure. The total susceptibility, both experimental and calculated, was found to decrease with increasing TL content up to about 60–70at.%. This variation was mainly ascribed to corresponding changes of the Van Vleck contribution and the spin susceptibility. The composition dependence of the latter term is in line with the previously established trend of variation of the density of states at the Fermi level n(EF) upon alloying. As in previous reports on electronic band-structure calculations, it turned out that to get agreement with experiments on n(EF) in amorphous Zr-Ni alloys, at least some partial chemical ordering should be taken into account. Available experimental data of crystalline stoichiometric Zr-Ni compounds beyond 70at.% Ni show a gradual increase of the Pauli susceptibility, indicating an approach toward the onset of ferromagnetic order observed previously experimentally around 90at.% Ni in amorphous Zr-Ni alloys. The susceptibility calculations for fcc Ti-Ni and Zr-Ni alloys indicate a strong increase of the spin susceptibility component above 70at.% Ni, and the calculated Stoner enhancement for Zr10Ni90 fulfills the condition of ferromagnetism in agreement with the experimental observation.

S. Mankovsky, I. Bakonyi, and H. Ebert

2007-11-06T23:59:59.000Z

423

Preliminary Investigations of Joining Technologies for Attaching Refractory Metals to Ni-Based Superalloys  

SciTech Connect (OSTI)

In this study, a range of joining technologies has been investigated for creating attachments between refractory metal and Ni-based superalloys. Refractory materials of interest include Mo-47%Re, T-111, and Ta-10%W. The Ni-based superalloys include Hastelloy X and MarM 247. During joining with conventional processes, these materials have potential for a range of solidification and intermetallic formation-related defects. For this study, three non-conventional joining technologies were evaluated. These included inertia welding, electro-spark deposition (ESD) welding, and magnetic pulse welding (MPW). The developed inertia welding practice closely paralleled that typically used for the refractory metals alloys. Metallographic investigations showed that forging during inertia welding occurred predominantly on the refractory metal side. It was also noted that at least some degree of forging on the Ni-based superalloy side of the joint was necessary to achieve consistent bonding. Both refractory metals were readily weldable to the Hastelloy X material. When bonding to the MarM 247, results were inconsistent. This was related to the higher forging temperatures of the MarM 247, and subsequent reduced deformation on that material during welding. ESD trials using a Hastelloy X filler were successful for all material combinations. ESD places down very thin (5- to 10-{mu}m) layers per pass, and interactions between the substrates and the fill were limited (at most) to that layer. For the refractory metals, the fill only appeared to wet the surface, with minimal dilution effects. Microstructures of the deposits showed high weld metal integrity with maximum porosity on the order of a few percent. Some limited success was also obtained with MPW. In these trials, only the T-111 tubes were used. Joints were possible for the T-111 tube to the Hastelloy X bar stock, but the stiffness of the tube (resisting collapse) necessitated the use of very high power levels. These power levels resulted in damage to the equipment (concentrator) during welding. It is of note that the joint made showed the typical wavy bond microstructure associated with magnetic pulse/explosion bond joints. Joints were not possible between the T-111 tube and the MarM 247 bar stock. In this case, the MarM 247 shattered before sufficient impact forces could be developed for bonding.

Gould, Jerry E. [Edison Welding Institute, 1250 Arthur E. Adams Drive, Columbus, OH 43221 (United States); Ritzert, Frank J. [NASA Glenn Research Center, 21000 Brookpark Road, Mail Stop 49-1, Cleveland, OH 44135 (United States); Loewenthal, William S. [Ohio Aerospace Institute, 21000 Brookpark Road, Mail Stop 49-1, Cleveland, OH 44135 (United States)

2006-01-20T23:59:59.000Z

424

Electrochemistry properties of multilayer TiN/Ti coatings on NiTi alloy for cardiac occluder application  

E-Print Network [OSTI]

-elasticity, thermal shape memory, high corrosion and fatigue resistance, make NiTi alloy especially suitableTi alloy is a subject of numerous recent studies to improve the material's corrosion resistance as well,b , D.Y. Zhang e a Center for Biomedical Materials and Tissue Engineering, Academy for Advanced

Zheng, Yufeng

425

Features of the band structure and conduction mechanisms in the n-HfNiSn semiconductor heavily doped with Ru  

SciTech Connect (OSTI)

The crystal and electronic structure and energy and kinetic properties of the n-HfNiSn semiconductor heavily doped with a Ru acceptor impurity are investigated in the temperature and Ru concentration ranges T = 80–400 K and N{sub A}{sup Ru} ? 9.5 × 10{sup 19}?5.7 × 10{sup 20} cm{sup ?3} (x = 0–0.03), respectively. The mechanism of structural-defect generation is established, which changes the band gap and degree of compensation of the semiconductor and consists in the simultaneous concentration reduction and elimination of donor structural defects by means of the displacement of ?1% of Ni atoms from the Hf (4a) positions, the generation of acceptor structural defects upon the substitution of Ru atoms for Ni atoms in the 4c positions, and the generation of donor defects in the form of vacancies in the Sn (4b) positions. The calculated electronic structure of HfNi{sub 1?x}Ru{sub x}Sn is consistent with the experiment. The results obtained are discussed within the Shklovsky-Efros model for a heavily doped and compensated semiconductor.

Romaka, V. A., E-mail: vromaka@polynet.lviv.ua [National Academy of Sciences of Ukraine, Pidstrygach Institute for Applied Problems in Mechanics and Mathematics (Ukraine); Rogl, P. [Universität Wien, Institut für Physikalische Chemie (Austria); Romaka, V. V. [National University Lvivska Politekhnika (Ukraine); Stadnyk, Yu. V. [Ivan Franko National University of Lviv (Ukraine); Korzh, R. O.; Krayovskyy, V. Ya. [National University Lvivska Politekhnika (Ukraine); Horyn, A. M. [Ivan Franko National University of Lviv (Ukraine)

2014-12-15T23:59:59.000Z

426

Highly stable Ni catalyst supported on Ce–ZrO2 for oxy-steam reforming of methane  

Science Journals Connector (OSTI)

A novel catalyst, Ni/Ce–ZrO2..., exhibits very high catalytic activity and stability even in the stoichiometric steam reforming of methane (H2O/CH4...= 1). Furthermore, when it was employed in oxy-steam reforming

Hyun-Seog Roh; Ki-Won Jun; Wen-Sheng Dong; Sang-Eon Park…

2001-06-01T23:59:59.000Z

427

An experimental and modeling study of isothermal charge/discharge behavior of commercial NiMH cells  

E-Print Network [OSTI]

is used to predict and compare various charge algorithms so as to provide guidelines for application and hybrid-electric vehicles. For clean transportation, Ni­MH battery is presently the most promising battery evolution reaction was coupled with main electro- chemical reactions on both electrodes. A sensitivity

428

Salicidation process using NiSi and its device application R. A. Johnson, P. M. Asbeck, and S. S. Lau  

E-Print Network [OSTI]

temperature window. In this article, the formation of nickel mono-silicide NiSi using rapid thermal annealing. In the recent past, there have been concerns related to the in- crease of TiSi2 film resistivity on submicron resistivity C54 phase.5,6 The TiSi2 process- ing temperature window is relatively narrow due to the high

Asbeck, Peter M.

429

Plastic deformation of bunsenite (NiO) at temperatures below 1 050 C F. Guiberteau (*), A. Donminguez-Rodriguez  

E-Print Network [OSTI]

87 Plastic deformation of bunsenite (NiO) at temperatures below 1 050 °C F. Guiberteau (*), A much smaller than the one previously published [3, 5]. The plastic anisotropy is compared to other processes of deformation of materials. In the past, we have studied the plasticity of nickel oxide at high

Boyer, Edmond

430

Scaling relationship on macroscopic helical domains in NiTi tubes Y.J. He, Q.P. Sun *  

E-Print Network [OSTI]

that determines the size and shape of the helical domain and what is the effect of dry- friction type stress: Macroscopic helical domains Martensitic phase transformation NiTi shape memory alloy tube Energy minimization- ized in a helix-shaped macro-domain consisting of almost fully transformed grains whose statistical

Sun, Qing-Ping

431

Heavy-electron behavior in single-crystal YbNi{sub 2}B{sub 2}C  

SciTech Connect (OSTI)

We have measured the magnetic susceptibility, specific heat, and electrical resistivity on single crystals of the intermetallic borocarbide YbNi{sub 2}B{sub 2}C. An enhanced linear contribution is observed in the specific heat with a Sommerfeld coefficient of 530 mJ/molK{sup 2}, indicative of a heavy-electron system with a Kondo temperature {approximately}10 K. The magnetic susceptibility, which is anisotropic and Curie-Weiss-like at high temperatures, is also consistent with our interpretation of a strongly correlated ground state at low temperatures and crystal-electric- field excitations at higher temperatures. At {ital T}=1.8 K, the Wilson ratio is determined to be 0.85 using the high-temperature effective moment. The resistivity shows a quadratic temperature dependence below 1.5 K with a {ital T}{sup 2} coefficient of 1.2 {mu}{Omega}cmK{sup {minus}2}. Unlike the other members of the series {ital R}Ni{sub 2}B{sub 2}C ({ital R}=Y, Gd{endash}Lu), YbNi{sub 2}B{sub 2}C does not order above our lowest measurement temperature of 0.34 K. The suppression of superconductivity in YbNi{sub 2}B{sub 2}C is consistent with a significantly enhanced hybridization between the conduction electrons and the 4{ital f} states. {copyright} {ital 1996 The American Physical Society.}

Yatskar, A.; Budraa, N.K.; Beyermann, W.P. [University of California, Riverside, California 92521 (United States)] [University of California, Riverside, California 92521 (United States); Canfield, P.C.; Budko, S.L. [Ames Laboratory and Iowa State University, Ames, Iowa 50011 (United States)] [Ames Laboratory and Iowa State University, Ames, Iowa 50011 (United States)

1996-08-01T23:59:59.000Z

432

Three-Dimensional Analysis of Solid Oxide Fuel Cell Ni-YSZ Anode Interconnectivity James R. Wilson,a  

E-Print Network [OSTI]

1 Three-Dimensional Analysis of Solid Oxide Fuel Cell Ni-YSZ Anode Interconnectivity James R of interconnectivity of solid-oxide fuel cell (SOFC) electrode phases. The method was applied to the three, and hence was not electrochemically active. #12;2 1. Introduction Attempts to understand solid oxide fuel

Kalies, William D.

433

Effect of temperature and time on properties of Spark Plasma Sintered NiCuZn: Co ferrite  

E-Print Network [OSTI]

behavior and their applications in power electronics devices for from the radio frequency (300 kHz to 3 MHzEffect of temperature and time on properties of Spark Plasma Sintered NiCuZn: Co ferrite K. Zehani Plasma Sintering is a powerfal method to produce fine grain dense ferrite at low temperature. However

434

Temperature dependence of magnetic behaviour in very fine grained, spark plasma sintered NiCuZn Ferrites  

E-Print Network [OSTI]

with wide bandwidth up to 30MHz. In this paper the frequency range of 100 kHz to 5 MHz is investigated the magnetization processes taking place in these nano grained materials, in the frequency interval of 100kHz to 5Temperature dependence of magnetic behaviour in very fine grained, spark plasma sintered Ni

Boyer, Edmond

435

Diffusion-governed-asymmetric growth of amorphous layer under solid-state reaction in Ni-Zr multilayers  

SciTech Connect (OSTI)

A molecular-dynamics simulation with an n-body potential was performed to study solid-state amorphization in the Ni-Zr system upon annealing at medium temperatures ranging from 300 to 600 C. The models for simulation were a Zr-Ni-Zr sandwich consisting of both hcp Zr and fcc Ni (001) atomic planes and a bilayer with a thin preset disordered interfacial layer, respectively, for revealing the detailed amorphization process and the growing kinetics of an amorphous layer upon solid-state reaction. The simulation results demonstrated, for the first time, that the atomic process proceeded through first diffusion, then alloying and eventually amorphization. In other words, amorphization was controlled by a diffusion-limited reaction and the growth kinetics of the amorphous layer followed exactly a t{sup 1/2} law. Another interesting finding was that the growing speeds of the amorphous layer exhibited an asymmetric behavior, i.e, the amorphous layer extended faster towards Ni lattice than that directed to Zr side. Besides, it was also found that an initiation of amorphization upon annealing was dependent to the interfacial textures, i.e., amorphization could take place when the interfaces were composed of the more open atomic planes, whereas it was suppressed if the interfaces were constructed with the close-packed planes of both lattices.

Liu, B.X.; Lai, W.S. [Tsinghua Univ., Beijing (China). Dept. of Materials Science and Engineering

1998-12-31T23:59:59.000Z

436

X-ray Absorption Measurements on Nickel Cathode of Sodium-beta Alumina batteries: Fe-Ni-CI Chemical Associations  

SciTech Connect (OSTI)

Sections of Na-Al-NiCl2 cathodes from sodium-beta alumina ZEBRA batteries have been characterized with X-ray fluorescence mapping, and XANES measurements to probe the microstructure, elemental correlation, and chemical speciation after voltage cycling. Cycling was performed under identical load conditions at either 240 or 280 °C operating temperature and subsequently quenched in either the charged or discharged state. X-ray fluorescence mapping and XANES measurements were made adjacent to the current collector and ?"-Al2O3 solid electrolyte interfaces to detect possible gradients in chemical properties across the cathode. An FeS additive, introduced during battery synthesis, was found to be present as either Fe metal or an Fe(II) chloride in all cathode samples. X-ray fluorescence mapping reveals an operating temperature and charge-state dependent spatial correlation between Fe, Ni, and Cl concentration. XANES measurements indicate that both Ni and Fe are chemically reactive and shift between metallic and chloride phases in the charged and discharged states, respectively. However the percentage of chemically active Ni and Fe is significantly less in the cell operated at lower temperature. Additionally, the cathode appeared chemically homogeneous at the scale of our X-ray measurements.

Bowden, Mark E.; Alvine, Kyle J.; Fulton, John L.; Lemmon, John P.; Lu, Xiaochuan; Webb-Robertson, Bobbie-Jo M.; Heald, Steve M.; Balasubramanian, Mahalingam; Mortensen, Devon R.; Seidler, Gerald T.; Hess, Nancy J.

2014-02-01T23:59:59.000Z

437

Development of Ni1-xCoxO as the cathode/interconnect contact for solid oxide fuel cells  

SciTech Connect (OSTI)

A new type of material, Ni1-xCoxO, was developed for solid oxide fuel cell (SOFC) cathode/interconnect contact applications. The phase structure, coefficient of thermal expansion, sintering behavior, electrical property, and mechanical bonding strength of these materials were evaluated against the requirements of the SOFC cathode/interconnect contact. A dense cathode/interconnect contact layer was developed through reaction sintering from Ni and Co metal powders. An area specific resistance (ASR) as low as 5.5 mohm.cm2 was observed after 1000 h exposure in air at 800 °C for the LSM/Ni0.33Co0.67O/AISI441 assembly. Average mechanical strengths of 6.8 and 5.0 MPa were obtained for the cathode/contact/cathode and interconnect/contact/interconnect structures, respectively. The significantly low ASR was probably due to the dense structure and therefore improved electrical conductivity of the Ni0.33Co0.67O contact and the good bonding of the interfaces between the contact and the cathode, and between the contact and the interconnect.

Lu, Zigui; Xia, Guanguang; Templeton, Joshua D.; Li, Xiaohong S.; Nie, Zimin; Yang, Zhenguo; Stevenson, Jeffry W.

2011-06-01T23:59:59.000Z

438

Effect of boundary scattering on the thermal conductivity of TiNiSn-based half-Heusler alloys  

Science Journals Connector (OSTI)

TiNiSn-based half-Heusler alloys have been of significant interest for their potential as thermoelectric materials. They exhibit promising electronic transport properties as revealed through high Seebeck coefficient and moderate electrical resistivity values. The chief disadvantage of these materials is a comparatively high lattice thermal conductivity. Attempts to “tune” the lattice thermal conductivity (?L) in these materials have led to the comparison and analysis of the thermal conductivity of two series of Ti- and Zr-based half-Heusler alloys. In the first series, Ti1?yZryNiSn0.95Sb0.05, a significant reduction in ?L is observed, with the substitution of large concentrations of Zr (y?25%) at Ti site, which is most likely due to mass fluctuation scattering. In the second series, TiNiSn1?xSbx, a nonsystematic increase in ?L is observed, with minute amounts of Sb doping (x?5%) at the Sn site. Extensive microstructural analysis in a TiNiSn1?xSbx series reveals a correlation between ?L and the average grain diameter in these materials, which is in good agreement with theoretical predictions related to phonon boundary scattering. In addition, a comparison of the calculated phonon mean free path in each of the series of compounds shows some insight into the two different phonon scattering mechanisms.

S. Bhattacharya; M. J. Skove; M. Russell; T. M. Tritt; Y. Xia; V. Ponnambalam; S. J. Poon; N. Thadhani

2008-05-30T23:59:59.000Z

439

Cooperative effect of monoclinic distortion and sinusoidal modulation in the martensitic structure of Ni{sub 2}FeGa  

SciTech Connect (OSTI)

The structural features of the '5M' martensitic phase in Ni{sub 2}FeGa alloys have been determined by electron diffraction using the multi-slice least-squares (MSLS) method. The results demonstrate that the '5M' phase contains an evident cooperative effect of monoclinic distortion and sinusoidal modulation along the [110]{sub c} direction. Theoretical simulations based on our refined data suggest that the '5M' martensitic phase observed in Ni-Fe-Ga and Ni-Mn-Ga has visible common behaviors in both stacking sequence and local structural distortion. Considering the cooperative effect of monoclinic distortion and sinusoidal modulation, we demonstrate that the '7M' martensitic phase could adopt two equivalent structural phases corresponding with the stacking sequences of (43{sup -}){sub 2} and (52{sup -}){sub 2}, respectively. - Graphical abstract: The structural model of the '5M' Ni{sub 2}FeGa martensite viewed along the [001]{sub c} (i.e. [010]{sub m}) zone axis, demonstrating the cooperative effect of monoclinic distortion and sinusoidal modulation along the [110]{sub c} direction.

Lu, J.B.; Yang, H.X.; Tian, H.F.; Zeng, L.J.; Ma, C.; Feng, L.; Wu, G.H. [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Li, J.Q., E-mail: LJQ@aphy.iphy.ac.c [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Jansen, J. [National Center for HREM, Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Lorentzweg 1, Delft (Netherlands)

2010-02-15T23:59:59.000Z

440

Ni catalysts derived from Mg–Al layered double hydroxides for hydrogen production from landfill gas conversion  

Science Journals Connector (OSTI)

A layered double hydroxide (LDH) precursor with a hydrotalcite-like structure containing Ni/Mg/Al cations was prepared. A series of Ni catalysts containing mixed-oxides and spinel phases were then obtained through thermal treatment of the LDH precursor. X-ray diffraction (XRD), transmission electron microscopy (TEM), and temperature-programmed reduction (TPR) revealed that the LDH derived Ni catalysts have well-dispersed nickel phases upon reduction. The thermal treatment temperatures have noticeable effects on the specific surface area, pore volume, phase transformation, particle size, and reducibility of the catalysts. Thermal treatment temperatures up to 700 °C promote the generation of mesopores which facilitate an increase in specific area and pore volume. Beyond 700 °C sintering occurs, mesopores collapse, and specific area and pore volume decrease. High thermal treatment temperatures favor the phase transformation to spinel solid solutions and the particle size growth. Metal-support interaction is enhanced but reducibility is hindered due to the formation of spinel solid solution phases. The LDH derived Ni catalysts were tested for landfill gas conversion at 750 °C and have shown excellent activity and stability in terms of methane conversion. At gas hourly space velocity (GHSV) of 240,000 h?1 and pressure of 1 atm, 81% methane conversion was achieved during a 48 h test period without apparent catalyst deactivation.

Qingsong Wang; Wei Ren; Xueliang Yuan; Ruimin Mu; Zhanlong Song; Xiaolin Wang

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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
to obtain the most current and comprehensive results.


441

Removal of As, Cd, Cu, Ni, Pb, and Zn from a highly contaminated industrial soil using surfactant enhanced soil washing  

Science Journals Connector (OSTI)

Surfactant enhanced soil washing (SESW) was applied to an industrial contaminated soil. A preliminary characterization of the soil regarding the alkaline-earth metals, Na, K, Ca and Mg took values of 2866, 2036, 2783 and 4149 mg/kg. The heavy metals As, Cd, Cu, Pb, Ni and Zn, had values of 4019, 14, 35582, 70, 2603, and 261 mg/kg, respectively. When using different surfactants, high removal of Cu, Ni and Zn were found, and medium removals for Pb, As and Cd. In the case of these three metals, tap water removed more than the surfactant solutions, except for the case of As. There were surfactants with average removals (this is, the removal for all the metals studied) of 67.1% (Tween 80), 64.9% (Surfacpol 14104) and 61.2% (Emulgin W600). There were exceptional removals using Texapon N-40 (83.2%, 82.8% and 86.6% for Cu, Ni and Zn), Tween 80 (85.9, 85.4 and 81.5 for Cd, Zn and Cu), Polafix CAPB (79%, 83.2% and 49.7% for Ni, Zn and As). The worst results were obtained with POLAFIX LO with a global removal of 45%, well below of the average removal with tap water (50.2%).All removal efficiencies are reported for a one step washing using 0.5% surfactant solutions, except for the case of mezquite gum, where a 0.1% solution was employed.

Luis G. Torres; Rosario B. Lopez; Margarita Beltran

2012-01-01T23:59:59.000Z

442

Friction anisotropy at Ni,,100...,,100... interfaces: Molecular dynamics studies Yue Qi and Yang-Tse Cheng  

E-Print Network [OSTI]

Friction anisotropy at Ni,,100...Ã?,,100... interfaces: Molecular dynamics studies Yue Qi and Yang of Technology, Pasadena, California, 91125 Received 8 March 2002; published 30 August 2002 The friction theories predict that most perfect clean incommensurate interfaces would produce no static friction

Goddard III, William A.

443

Hydrogen-evolution characteristics of NiMo-coated, radial junction, p-silicon microwire array photocathodes  

E-Print Network [OSTI]

absorption and carrier collection, and thus provides an opportunity to obtain high solar energy-conversion on the basis of thermodynamic energy-conversion efficiency as well as solar cell figures of merit. The Ni densities (Jsc) of 9.1 mA cmÃ?2 , and thermodynamically based energy-conversion efficiencies (h) of 1

Atwater, Harry

444

Hydrogenation of the nanopowders that form in a carbon-helium plasma stream during the introduction of Ni and Mg  

SciTech Connect (OSTI)

Composite nanoparticles consisting of magnesium, nickel, and carbon atoms are studied both theoretically and experimentally. The calculations performed in terms of the density functional theory show that the jump frequency of hydrogen atoms in nickel-containing magnesium hydride increases substantially near impurity nickel atoms; as a result, the rate of hydrogen absorption by magnesium also increases. Nickel on the magnesium surface is shown to be absorbed via an island growth mechanism. Composite Mg-C, Ni-C, and Mg-Ni-C powders are produced by plasmachemical synthesis in a carbon-helium plasma stream. Hydrogen is introduced into a chamber during synthesis. It is found by X-ray photoelectron spectroscopy and thermogravimetric analysis that, among these three composites, only Mg-Ni-C contains magnesium fixed in the MgH{sub 2} compound. The process of such 'ultrarapid' hydrogenation of magnesium, which occurs in the time of formation of composite nanoparticles, can be explained by the catalytic action of nickel, which is enhanced by a high temperature. Scanning electron microscopy micrographs demonstrate the dynamics of the dehydrogenation of Mg-Ni-C composite nanoparticles in heating by an electron beam.

Churilov, G. N., E-mail: churilov@iph.krasn.ru; Osipova, I. V. [Russian Academy of Sciences, Kirensky Institute of Physics, Siberian Branch (Russian Federation); Tomashevich, Ye. V. [Russian Academy of Sciences, Institute of Chemistry and Chemical Technology, Siberian Branch (Russian Federation); Glushchenko, G. A.; Fedorov, A. S.; Popov, Z. I. [Russian Academy of Sciences, Kirensky Institute of Physics, Siberian Branch (Russian Federation); Bulina, N. V. [Russian Academy of Sciences, Institute of Solid State Chemistry and Mechanochemistry (Russian Federation); Vereshchagin, S. N.; Zhizhaev, A. M. [Russian Academy of Sciences, Institute of Chemistry and Chemical Technology, Siberian Branch (Russian Federation); Cherepakhin, A. V. [Russian Academy of Sciences, Kirensky Institute of Physics, Siberian Branch (Russian Federation)

2011-12-15T23:59:59.000Z

445

Precipitation in Fe-or Ni-implanted and annealed GaAs J. C. P. Changa)  

E-Print Network [OSTI]

of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 E. S. Harmon, M. R. Melloch, and J. M. Woodall School of Electrical Engineering, Purdue University, West Lafayette, Indiana 47907/semiconductor composites by ion implantation of Fe and Ni into GaAs and a subsequent anneal to nucleate clusters. Electron

Woodall, Jerry M.

446

The adsorption of molecular oxygen on Au/Ni(111) alloys and its oxidation of CO at 85 K  

E-Print Network [OSTI]

Molecular oxygen is observed to adsorb on 0.2 - 0.6 ML Au/Ni(111) surface alloys. Molecular oxygen adsorbates are characterized by their 0-0 stretching frequencies of 740 cm', 851 cm' and 962 cm', as measured by high ...

Fischer, Jonathan David

2010-01-01T23:59:59.000Z

447

Ni Sorption/Release on Soil Clay Fractions A Kinetic and EXAFS Study D. R. Roberts, and A. M. Scheidegger  

E-Print Network [OSTI]

Ni Sorption/Release on Soil Clay Fractions A Kinetic and EXAFS Study D. R. Roberts, and A. M is necessary to successfully determine their fate in the environment. Mechanisms of metal sorption reactions approach. However, it is necessary to understand metal sorption mechanisms on natural, mixed systems

Sparks, Donald L.

448

Synthesis of PAA/NiFe2O4 composite nanoparticles and the effect of microstructure on magnetism  

Science Journals Connector (OSTI)

Abstract Nanosized NiFe2O4 and various microstructures composite nanoparticles of polyacrylic acid (PAA)/NiFe2O4 with the mass ratio of PAA to NiFe2O4 being 0.1, 0.2, 0.3 and 0.4, respectively, have been synthesized via two different hydrothermal procedures. The phase structure, morphology and magnetic property of composite nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM) and superconducting quantum interference device (SQUID). The results indicated that two types of coordination mode between PAA chains and NiFe2O4 nanoparticles had formed. One type was unidentate coordination bonds which resulted in core shell structure with a magnetic core of ferrite and a PAA shell. The increasing of PAA content led to thicker coating, lower saturation magnetization and coercivity of composite nanoparticles. Another type was bridged coordination which showed the character of PAA chains twisting to form network and ferrite particles being imbedded into PAA chains. With increased PAA content, their saturation magnetization and coercivity became decreased but with more slowly reduction than those of core shell structure samples. The effect mechanism of microstructure on magnetism was also studied.

Lei Zhang; Wanli Jiao; Jing He; Aijuan Zhang

2013-01-01T23:59:59.000Z

449

INSTALLATION MAG~NiX.ILRI DIVI8ION, CAN.fAN,CONN.  

Office of Legacy Management (LM)

INSTALLATION INSTALLATION MAG~NiX.ILRI DIVI8ION, CAN.fAN,CONN. .PERI,jD Aiq~+ 1, i950 TO: August 31, 195 .:\,.:. ,,., WORK SHEET FOR: I b WSIGNOR I. v DowChemical Go. Velasco, Texas ., Azlterprise Meetala cc Brooklyn, New York Meili $Worthin&m Hatboro, ?'a. LOT NO. '... I [ATERIAL SYnB,fJL KEASURED' NET WT. 100,007~ ( 4;020 I ! 19 ~, ANALYBIS % METAL/100 r, Noi. 23) METAL CONTENT INSTRUCTIONS: This sheet% will be Used.ln.preDarlng Haterlal Balance. 'The totals from the various ltams listed above ~111 be Inserted on the Material Balance Summary Sheet. Shipments ~111 he llated on this Work'Sheet separately With the-ConsIgnor and Consignee of each Shipment noted; Copies Of thls sheet ~111 accompany the naterlal Balance Summary Sheet at the end of the'month.

450

SF6432-NI (02-01-12) Fixed Price Former Soviet Union  

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

2/01/12 2/01/12 Page 1 of 15 Printed copies of this document are uncontrolled. Retrieve latest version electronically. SF 6432-NI (02/01/12) SECTION II STANDARD TERMS AND CONDITIONS FOR FIXED PRICE CONTRACTS WITH THE NEWLY INDEPENDENT STATES OF THE FORMER SOVIET UNION INDEX OF CLAUSES. THE FOLLOWING CLAUSES APPLY TO REQUESTS FOR QUOTATION AND CONTRACTS AS INDICATED UNLESS SPECIFICALLY DELETED, OR EXCEPT TO THE EXTENT THEY ARE SPECIFICALLY SUPPLEMENTED OR AMENDED IN WRITING IN THE SIGNATURE PAGE OR SECTION I. (CTRL+CLICK ON A LINK BELOW TO ADVANCE DIRECTLY TO THAT SECTION) ACCEPTANCE OF TERMS AND CONDITIONS APPLICABLE LAW ASSIGNMENT BANKRUPTCY (07/11) BREACH OF CONTRACT COMPLIANCE WITH THE LAWS OF THE COUNTRY AND THE UNITED STATES DEFINITIONS

451

Reactive solid-state dewetting of Cu-Ni films on silicon  

SciTech Connect (OSTI)

The behavior of a 50 nm Cu-Ni alloy film on Si in a process of reactive solid-state dewetting is presented. The films were annealed at a range of temperatures (300-700 deg. C) in 1%H{sub 2} 99%N{sub 2} reducing atmosphere. The resulting alloy and silicide particles formed by film dewetting and film reaction with the substrate were distinguished by selective wet etching and examined by scanning electron microscopy and spectroscopy. After potassium hydroxide etch, regions that etch slower than silicon substrate have distribution statistics similar to the alloy and silicide particles prior to their removal, indicating strong coupling between mass transport across the interface and along the surface.

Clearfield, Raphael; Railsback, Justin G.; Melechko, Anatoli V. [Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States); Pearce, Ryan C. [Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States); Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States); Hensley, Dale K.; Fowlkes, Jason D.; Fuentes-Cabrera, Miguel [Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Simpson, Michael L.; Rack, Philip D. [Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States); Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

2010-12-20T23:59:59.000Z

452

Continuous Wave Laser Processing for Electrical and Mechanical Stable Solar Cells with Ni-Cu Metallization  

Science Journals Connector (OSTI)

Abstract Two process sequences for the fabrication of Ni-Cu plated solar cells with a selective emitter by means of laser processing are presented. The purpose of the highly doped deep emitter is in this case not only to lower the contact resistance but to prevent shunting by nickel silicide which grows into the wafer. This silicide formation is found to be a key step in creating excellent contact adhesion. SEM imaging has been used to characterize the coverage of contact openings with nickel silicide. Electrical and mechanical properties of the fabricated solar cells as well as the advantages and disadvantages of the presented process sequences are discussed using SunsVoc and peel force measurements.

Christian Geisler; Wilhelm Hördt; Sven Kluska; Andrew Mondon; Sybille Hopman; Markus Glatthaar

2014-01-01T23:59:59.000Z

453

Fusion neutron irradiation of Ni(Si) alloys at high temperature  

SciTech Connect (OSTI)

Two Ni-4% Si alloys, with different cold work levels, are irradiated with 14 MeV fusion neutrons at 623 K, and their Curie temperatures are monitored during irradiation. The results are compared to those of an identical alloy irradiated by 2 MeV electrons. The results show that increasing dislocation density increases the Curie temperature change rate. At the same damage rate, the Curie temperature change rate for the alloy irradiated by 14 MeV fusion neutrons is only 6 to 7% of that for an identical alloy irradiated by 2 MeV electrons. It is well known that the migration of radiation induced defects contributes to segregation of silicon atoms at sinks in this alloy, causing the Curie temperature changes. The current results imply that the relative free defect production efficiency decreases from one for the electron irradiated sample to 6 to 7% for the fusion neutron irradiated sample. 17 refs., 4 figs., 1 tab.

Huang, J.S.; Guinan, M.W.; Hahn, P.A.

1987-09-01T23:59:59.000Z

454

Scanning Hall Probe Imaging of ErNi2B2C  

SciTech Connect (OSTI)

We report scanning Hall probe imaging of ErNi{sub 2}B{sub 2}C in the superconducting, antiferromagnetic, and weakly ferromagnetic regimes in magnetic fields up to 20 Oe, well below H{sub c1}, with two results. First, imaging isolated vortices shows that they spontaneously rearrange on cooling through the antiferromagnetic transition temperature T{sub N} = 6 K to pin on twin boundaries, forming a striped pattern. Second, a weak, random magnetic signal appears in the ferromagnetic phase below T{sub WFM} = 2.3 K, and no spontaneous vortex lattice is present down to 1.9 K. We conclude that ferromagnetism coexists with superconductivity either by forming small ferromagnetic domains or with oscillatory variation of the magnetization on sub-penetration depth length scales.

Bluhm, Hendrik; Sebastian, Suchitra; Guikema, Janice W.; Fisher, I.R.; Moler, Kathryn A.; /Stanford U., Appl. Phys. Dept.

2005-12-02T23:59:59.000Z

455

Adsorption of CO and O/sub 2/ on Ni(111) at 8 k  

SciTech Connect (OSTI)

The adsorption of carbon monoxide (CO) and oxygen (O/sub 2/) on Ni(111) at 8 K is studied by molecular-beam techniques coupled with high-resolution electron-energy-loss spectroscopy and work function measurements. The work functions are measured by a retarding-potential techniques using the HREEL spectrometer. The cryogenic crystal temperatures are attained by use of a liquid-helium cryostat described in detail. The total and normal components of the translational energy of the incident molecules are lowered to 0.3 and 0.02 kcal mol, respectively. No evidence for a trapped, physisorbed CO molecule or a physisorbed molecular O/sub 2/ species is observed in the limit of zero coverage.

Beckerle, J.D.; Yang, Q.Y.; Johnson, A.D.; Ceyer, S.T.

1988-01-01T23:59:59.000Z

456

Moessbauer and SANS Studies of Anti-Invar Fe-Ni-C Alloy under Magnetic Field  

SciTech Connect (OSTI)

Anti-Invar effect in the f.c.c.-Fe-25.3%Ni-C alloy was revealed, i.e., enhanced thermal expansion coefficient (TEC)({approx}20x10{sup -6} K{sup -1}) which was accompanied by almost temperature-insensitive behavior in a temperature range of 122-525 K that was considerably expanded to the low temperature range due to alloying with carbon. The Moessbauer and small-angle neutron scattering (SANS) experiments with the varying temperature and in an external magnetic field of 1.5-5 T have revealed an existence of inhomogeneous magnetic order in anti-Invar alloy below and above the magnetic transition point. The anti-Invar behavior correlates with the thermally induced change in the magnetic order and interspin interaction.

Nadutov, V. M.; Kosintsev, S. G.; Svystunov, Ye. O. [G.V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine, Kyiv (Ukraine); Garamus, V. M.; Willumeit, R.; Eckerlebe, H. [GKSS research center, Geeshtacht (Germany); Ericsson, T.; Annersten, H. [Uppsala University, Uppsala (Sweden)

2010-07-13T23:59:59.000Z

457

Amorphous and crystalline phase formation in Ni/Al multilayer thin films  

SciTech Connect (OSTI)

The authors have investigated reactive phase formation in magnetron sputter-deposited Ni/Al multilayer films with a 1:3 molar ratio and various periodicities ranging from 320 nm to a codeposited film with an effective periodicity of zero. The films were studied by x-ray diffraction, differential scanning calorimetry, electrical resistance measurements, and transmission electron microscopy. The authors find that a reaction which results in the formation of an amorphous phase has taken place during the multilayer deposition process. This reaction substantially reduces the driving force for subsequent reactions and explains why nucleation kinetics become important for these reactions. The mode of transformation for a film with 10 nm periodicity was investigated, in detail, by applying the Johnson-Mehl-Avrami analysis to data obtained from isothermal and constant heating rate differential scanning calorimetry, in combination with electron microscopy studies of the transformation microstructure.

Lucadamo, G.; Barmak, K. [Lehigh Univ., Bethlehem, PA (United States). Dept. of Materials Science and Engineering; Michaelsen, C. [GKSS Research Center, Geesthacht (Germany). Inst. of Materials Research

1996-12-31T23:59:59.000Z

458

Spreading of Sn-Ag solders on FeNi alloys  

SciTech Connect (OSTI)

The spreading of Sn-3Ag-xBi solders on Fe-42Ni has been studied using a drop transfer setup. Initial spreading velocities as fast as {approx}0.5 m/s have been recorded. The results are consistent with a liquid front moving on a metastable, flat, unreacted substrate and can be described by using a modified molecular-kinetic model for which the rate controlling step is the movement of one atom from the liquid to the surface of the solid substrate. Although the phase diagram predicts the formation of two Fe-Sn intermetallics at the solder/substrate interface in samples heated at temperatures lower than 513 C, after spreading at 250 C only a thin FeSn reaction layer could be observed. Two interfacial layers (FeSn and FeSn2) were found after spreading at 450 C.

Saiz, Eduardo; Hwang, C-W.; Suganuma, Katsuaki; Tomsia, Antoni P.

2003-02-28T23:59:59.000Z

459

Corrosion behavior of TiZrNiCuBe metallic glass coatings synthesized by electrospark deposition  

Science Journals Connector (OSTI)

Abstract Electrospark deposition was applied to successfully deposit TiZrNiCuBe metallic glass coating on 304L stainless steel. The coating was fully amorphous with the thickness of ?380 ?m. The corrosion behavior was investigated in 1, 6 and 11.5 mol/L HNO3. The optimal corrosion resistance was achieved in 6 mol/L HNO3 for the coating. The corrosion mechanism was discussed based on the effect of the structural heterogeneity on the corrosion resistance. It was found that the heterogeneous surface structure deteriorated the corrosion resistance. We believe that the coating will find a wide range of applications for protecting working parks in corrosive environments.

Congbo Li; Dehua Chen; Weiwei Chen; Lu Wang; Dawei Luo

2014-01-01T23:59:59.000Z

460

Brillouin light scattering study of spin waves in NiFe/Co exchange spring bilayer films  

SciTech Connect (OSTI)

Spin waves are investigated in Permalloy(Ni{sub 80}Fe{sub 20})/Cobalt(Co) exchange spring bilayer thin films using Brillouin light scattering (BLS) experiment. The magnetic hysteresis loops measured by magneto-optical Kerr effect show a monotonic decrease in coercivity of the bilayer films with increasing Py thickness. BLS study shows two distinct modes, which are modelled as Damon-Eshbach and perpendicular standing wave modes. Linewidths of the frequency peaks are found to increase significantly with decreasing Py layer thickness. Interfacial roughness causes to fluctuate exchange coupling at the nanoscale regimes and the effect is stronger for thinner Py films. A quantitative analysis of the magnon linewidths shows the presence of strong local exchange coupling field which is much larger compared to macroscopic exchange field.

Haldar, Arabinda; Banerjee, Chandrima; Laha, Pinaki; Barman, Anjan, E-mail: abarman@bose.res.in [Thematic Unit of Excellence on Nanodevice Technology, Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata 700098 (India)

2014-04-07T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

Surface nanostructuring of Ni/Cu foils by femtosecond laser pulses  

SciTech Connect (OSTI)

This work examines the effect of high-power femtosecond laser pulses on Ni/Cu bilayer foils produced by electrodeposition. We consider nanostructures formed at different laser beam parameters and under different ambient conditions. The surface nanostructures obtained in air and water have mostly the form of quasi-periodic ripples with a characteristic period of 400 - 450 and 370 - 390 nm, respectively, at a laser wavelength of 744 nm, whereas the nanostructures produced in ethanol and benzine have the form of spikes, typically spaced 400 - 700 nm apart. Femtosecond laser nanostructuring of metals is for the first time proposed, and experimentally tested, as a viable approach to producing anti-reflective coatings on the surface of polymer replicas. (laser nanotechnologies)

Korol'kov, V P; Ionin, Andrei A; Kudryashov, Sergei I; Seleznev, L V; Sinitsyn, D V; Samsonov, R V; Maslii, A I; Medvedev, A Zh; Gol'denberg, B G

2011-04-30T23:59:59.000Z

462

Measurement of the $^{58}$Ni($?$,$?$)$^{62}$Zn reaction and its astrophysical impact  

E-Print Network [OSTI]

Cross section measurements of the $^{58}$Ni($\\alpha$,$\\gamma$)$^{62}$Zn reaction were performed in the energy range $E_{\\alpha}=5.5-9.5$ MeV at the Nuclear Science Laboratory of the University of Notre Dame, using the NSCL Summing NaI(Tl) detector and the $\\gamma$-summing technique. The measurements are compared to predictions in the statistical Hauser-Feshbach model of nuclear reactions using the SMARAGD code. It is found that the energy dependence of the cross section is reproduced well but the absolute value is overestimated by the prediction. This can be remedied by rescaling the $\\alpha$ width by a factor of 0.45. Stellar reactivities were calculated with the rescaled $\\alpha$ width and their impact on nucleosynthesis in type Ia supernovae has been studied. It is found that the resulting abundances change by up to 5\\% when using the new reactivities.

S. J. Quinn; A. Spyrou; E. Bravo; T. Rauscher; A. Simon; A. Battaglia; M. Bowers; B. Bucher; C. Casarella; M. Couder; P. A. DeYoung; A. C. Dombos; J. Görres; A. Kontos; Q. Li; A. Long; M. Moran; N. Paul; J. Pereira; D. Robertson; K. Smith; M. K. Smith; E. Stech; R. Talwar; W. P. Tan; M. Wiescher

2014-05-23T23:59:59.000Z

463

Induced codeposition. 2: A mathematical model describing the electrodeposition of Ni-Mo alloys  

SciTech Connect (OSTI)

A steady-state mathematical model was developed to predict the behavior of the induced codeposition of Ni-Mo alloys in the kinetic and mass-transport controlled regions on rotating cylinder electrodes. The kinetic regions were characterized by a simple Tafel expression. A Nernst boundary layer representation described the mass transfer of ions through a diffusion layer. The governing features of the induced codeposition mechanism included soluble nickel acting as a catalyst to the molybdenum deposition and the generation of an absorbed intermediate species on the electrode surface. The resulting alloy composition was simulated for two electrolytes over a wide range of current densities and electrode rotation rates. The model predictions agreed with the observed trends in the experimental data.

Podlaha, E.J.; Landolt, D. [Ecole Polytechnique Federale de Lausanne (Switzerland)

1996-03-01T23:59:59.000Z

464

Magneto-optical spectroscopy of ferromagnetic shape-memory Ni-Mn-Ga alloy  

SciTech Connect (OSTI)

Magneto-optical properties of single crystal of Ni{sub 50.1}Mn{sub 28.4}Ga{sub 21.5} magnetic shape memory alloy in martensite and austenite phase were systematically studied. Crystal orientation was approximately along (100) planes of parent cubic austenite. At room temperature, the sample was in modulated 10M martensite phase and transformed to cubic austenite at 323?K. Spectral dependence of polar magneto-optical Kerr effect was obtained by generalized magneto-optical ellipsometry with rotating analyzer in the photon energy range from 1.2 to 4?eV, and from room temperature to temperature above the Curie point. The Kerr rotation spectra exhibit prominent features typical for complexes containing Mn atoms. Significant spectral changes during transformation to austenite can be explained by different optical properties caused by changes in density of states near the Fermi energy.

Veis, M., E-mail: veis@karlov.mff.cuni.cz; Beran, L.; Zahradnik, M.; Antos, R. [Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 12116 Prague (Czech Republic); Straka, L. [Aalto University School of Engineering, PL14200, FIN-00076 Aalto (Finland); Kopecek, J.; Fekete, L.; Heczko, O. [Institute of Physics, ASCR, Na Slovance 2, 182 21 Prague (Czech Republic)

2014-05-07T23:59:59.000Z

465

Electrochemically controlled pitting corrosion in Ni film: A study of AFM and neutron reflectometry  

Science Journals Connector (OSTI)

Electrochemical behavior of pitting corrosion of a Ni film, grown on Si substrate by sputtering, prepassivated in a chloride-free sulfuric acid solution and subsequently exposed to chloride above the pitting potential is reported. Specular and off-specular unpolarized neutron reflectometry and Atomic Force Microscopy (AFM) techniques have been used to determine the depth profile of scattering length density and morphology of as-deposited as well as corroded sample. Specular neutron reflectometry measurement of the film after corrosion shows density degradation along the thickness of film. The density profile as a function of depth, maps the growth of pitting and void networks due to corrosion. The AFM and off-specular neutron reflectivity measurements has suggested that the morphology of the film remains same after exposure of the film in chloride solution.

Surendra Singh; Saibal Basu; A.K. Poswal; R.B. Tokas; S.K. Ghosh

2009-01-01T23:59:59.000Z

466

Joule-heating effects in the amorphous Fe40Ni40B20 alloy  

Science Journals Connector (OSTI)

The effects of Joule heating on the amorphous Fe40Ni40B20 alloy are investigated by measuring the time behavior of the electrical resistance of ribbon strips during such a treatment. The structural transformations occurring in subsequent stages of the process are studied by means of x-ray-diffraction, differential-scanning-calorimetry, and magnetic-permeability measurements. A continuous evolution from a fully amorphous to a fully crystalline structure may be followed. The crystallization mechanisms observed in Joule-heated samples differ from the ones occurring under conventional heating conditions. The electrical resistance displays a bump in the course of Joule heating. A quantitative model relating such a bump to the extra heat released to the sample by fast crystallization is proposed and discussed.

P. Allia, M. Baricco, P. Tiberto, and F. Vinai

1993-02-01T23:59:59.000Z

467

Ford/BASF SE/UM Activities in Support of the Hydrogen Storage Engineering Center of Excellence - DOE Hydrogen and Fuel Cells Program FY 2012 Annual Progress Report  

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

51 51 FY 2012 Annual Progress Report DOE Hydrogen and Fuel Cells Program Michael Veenstra (Primary Contact, Ford), Andrea Sudik (Ford), Donald Siegel (UM), Justin Purewal (UM), Chunchuan Xu (UM), Yang Ming (UM), Manuela Gaab (BASF SE), Stefan Maurer (BASF SE), Ulrich Müller (BASF SE), Jun Yang (Ford) Ford Motor Company 2101 Village Road Dearborn, MI 48121 Phone: (313) 322-3148 Email: mveenstr@ford.com DOE Managers HQ: Ned Stetson Phone: (202) 586-9995 Email: Ned.Stetson@ee.doe.gov GO: Jesse Adams Phone: (720) 356-1421 Email: Jesse.Adams@go.doe.gov Contract Number: DE-FC36-GO19002 Subcontractors: * University of Michigan, Ann Arbor, MI * BASF SE, Ludwigshafen, Germany Project Start Date: February 1, 2009

468

Performance Characteristics of Fluidized Bed Syngas Methanation over Ni-Mg/Al2O3 Catalyst  

Science Journals Connector (OSTI)

Abstract The performance characteristics of isothermal fluidized bed syngas methanation for substitute natural gas is investigated over a self-made Ni-Mg/Al2O3 catalyst. Via atmospheric methanation in a laboratory fluidized bed reactor it was clarified that the CO conversion varied in 5% when changing the space velocity in 40-120 L · g- 1 · h- 1 but the conversion increased obviously by raising the superficial gas velocity from 4 to 12.4 cm · s- 1. The temperature 823 K is suitable for syngas methanation while obvious deposition of uneasy-oxidizing C? occurs on the catalyst at temperatures around 873 K. From kinetic aspect, the lowest reaction temperature is suggested to be 750 K when the space velocity is 60 L · g- 1 · h- 1. Raising the H2/CO ratio of the syngas increased proportionally the CO conversion and CH4 selectivity, showing that at enough high H2/CO ratios the active sites on the catalyst are sufficient for CO adsorption and in turn the reaction with H2 for forming CH4. Introducing CO2 into the syngas feed increased H2 consumption but suppressed water gas shift and Boudouard reactions. The ratio of CO2/CO in syngas should be better below 0.52 because varying the ratio from 0.52 to 0.92 resulted in negligible increases in the H2 conversion and CH4 selectivity but decreased the CH4 yield. Introducing steam into the feed gas affected little the CO conversion but decreased the selectivity to CH4. The tested Ni-Mg/Al2O3 catalyst manifested good stability in structure and activity even in syngas containing water vapor.

Jiao Liu; Dianmiao Cui; Jian Yu; Fabing Su; Guangwen Xu

2014-01-01T23:59:59.000Z

469

Optical, structural, and electrical properties of Mg{sub 2}NiH{sub 4} thin films in situ grown by activated reactive evaporation  

SciTech Connect (OSTI)

Mg{sub 2}NiH{sub 4} thin films have been prepared by activated reactive evaporation in a molecular beam epitaxy system equipped with an atomic hydrogen source. The optical reflection spectra and the resistivity of the films are measured in situ during deposition. In situ grown Mg{sub 2}NiH{sub 4} appears to be stable in vacuum due to the fact that the dehydrogenation of the Mg{sub 2}NiH{sub 4} phase is kinetically blocked. Hydrogen desorption only takes place when a Pd cap layer is added. The optical band gap of the in situ deposited Mg{sub 2}NiH{sub 4} hydride, 1.75 eV, is in good agreement with that of Mg{sub 2}NiH{sub 4} which has been formed ex situ by hydrogenation of metallic Pd capped Mg{sub 2}Ni films. The microstructure of these in situ grown films is characterized by a homogeneous layer with very small grain sizes. This microstructure suppresses the preferred hydride nucleation at the film/substrate interface which was found in as-grown Mg{sub 2}Ni thin films that are hydrogenated after deposition.

Westerwaal, R. J.; Slaman, M.; Broedersz, C. P.; Borsa, D. M.; Dam, B.; Griessen, R.; Borgschulte, A.; Lohstroh, W.; Kooi, B.; Brink, G. ten; Tschersich, K. G.; Fleischhauer, H. P. [Faculty of Sciences, Department of Physics and Astronomy, Condensed Matter Physics, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam (Netherlands); GKSS-Research Center Geesthacht GmbH, WTP, Building 59 Max-Planck-Strasse 1, 21502 Geesthacht (Germany); Institut fuer Nanotechnologie, Forschungszentrum Karlsruhe GmbH, Postfach 36 40 76021 Karlsruhe (Germany); Department of Applied Physics, University of Groningen, Nijenborgh 4, 9747 AG Groningen (Netherlands); Institut fuer Schichten und Grenzflaechen, Forschungszentrum Juelich GmbH, 52425 Juelich (Germany)

2006-09-15T23:59:59.000Z

470

Long-term behaviour of solid oxide fuel cell interconnect materials in contact with Ni-mesh during exposure in simulated anode gas at 700 and 800 °C  

Science Journals Connector (OSTI)

Abstract In the present study the long-term behaviour of two ferritic steels, Crofer 22 APU and Crofer 22H, in contact with a Ni-mesh during exposure in simulated anode gas, Ar–4%H2–2%H2O, at 700 and 800 °C for exposure times up to 3000 h was investigated. Ni diffusion from the Ni-mesh into the steel resulted in the formation of an austenitic zone whereas diffusion of iron and chromium from the steel into the Ni-mesh resulted in the formation of chromia base oxides in the Ni-mesh. Depending on the chemical composition of the steel, the temperature and the exposure time, interdiffusion processes between ferritic steel and Ni-mesh also resulted in ?-phase formation at the austenite–ferrite interface and in Laves-phase dissolution in the austenitic zone. The extent and morphology of the ?-phase formation are discussed on the basis of thermodynamic considerations, including reaction paths in the ternary alloy system Fe–Ni–Cr.

L. Garcia-Fresnillo; V. Shemet; A. Chyrkin; L.G.J. de Haart; W.J. Quadakkers

2014-01-01T23:59:59.000Z

471

Controlled synthesis and magnetic properties of Co{sub 1-x}Ni{sub x}/MWCNT nanocomposites by microwave irradiation  

SciTech Connect (OSTI)

Highlights: Composition-controlled Co{sub 1-x}Ni{sub x} alloy nanoparticles attached uniformly on MWCNTs were prepared by microwave irradiation. Black-Right-Pointing-Pointer The composition of CoNi can be controlled by adjusting the atomic ratios of metal Co to Ni in the mixed acetate solution. Black-Right-Pointing-Pointer Both the Hc and Ms increase with increasing Co concentration from x = 0.8 to 0.5, then decrease from x = 0.5 to 0.2. -- Abstract: Co{sub 1-x}Ni{sub x} alloy nanoparticles (x = 0.2, 0.5, 0.6, and 0.8) with the diameter 15-28 nm attached on the surface of multi-walled carbon nanotubes (MWCNTs) were prepared to form Co{sub 1-x}Ni{sub x}/MWCNT nanocomposites by microwave irradiation. Experimental results demonstrated that Co{sub 1-x}Ni{sub x} alloy nanoparticles with quasi-spherical and face-centered cubic structure had been attached on the MWCNTs, the composition and size of Co{sub 1-x}Ni{sub x} alloy nanoparticles could be controlled through adjusting the atomic ratios of metal Co to Ni in the mixed acetate solution, the microwave power and microwave irradiation time, respectively. Both the coercivity and the saturation magnetization of Co{sub 1-x}Ni{sub x} alloy nanoparticles increased with increasing Co concentration from x = 0.8 to 0.5, and decreased when Co concentration was increased from x = 0.5 to 0.2. These confirm that microwave synthesis is promising for fabricating alloy nanoparticles attached on MWCNTs for magnetic storage and ultra high-density magnetic recording applications.

Wu, Huaqiang, E-mail: wuhuaq@mail.ahnu.edu.cn [College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu 241000 (China)] [College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu 241000 (China); Cao, Peipei; Zhang, Ning; Mao, Li; Li, Mingming [College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu 241000 (China)] [College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu 241000 (China)

2012-01-15T23:59:59.000Z

472

Effect of thermally stable Cu- and Mg-rich aluminides on the high temperature strength of an AlSi12CuMgNi alloy  

SciTech Connect (OSTI)

The internal architecture of an AlSi12CuMgNi piston alloy, revealed by synchrotron tomography, consists of three dimensional interconnected hybrid networks of Cu-rich aluminides, Mg-rich aluminides and eutectic/primary Si embedded in an ?-Al matrix. The strength at room temperature and at 300°C is studied as a function of solution treatment time at 490°C and compared with results previously reported for an AlSi12Ni alloy. The addition of 1 wt% Cu and 1 wt% Mg to AlSi12CuMgNi increases the room temperature strength by precipitation hardening while the strength at 300°C is similar for both alloys in as-cast condition. The strength of AlSi12CuMgNi decreases with solution treatment time and stabilizes at 4 h solution treatment. The effect of solution treatment time on the strength of the AlSi12CuMgNi alloy is less pronounced than for the AlSi12Ni alloy both at room temperature and at 300°C. - Highlights: • The 3D microstructure of AlSi12CuMgNi is revealed by synchrotron tomography. • An imaging analysis procedure to segment phases with similar contrasts is presented. • 1 wt% Cu and Mg results in the formation of 3D networks of rigid phases. • AlSi12CuMgNi is stronger than AlSi12Ni owing to the stability of the 3D networks.

Asghar, Z., E-mail: zhdasghar@yahoo.com [Materials Division, Directorate of Technology, PINSTECH, P. O. Nilore, Islamabad (Pakistan); Vienna University of Technology, Institute of Materials Science and Technology, Karlsplatz 13/308, A-1040 Vienna (Austria); Requena, G. [Vienna University of Technology, Institute of Materials Science and Technology, Karlsplatz 13/308, A-1040 Vienna (Austria); Zahid, G.H.; Rafi-ud-Din [Materials Division, Directorate of Technology, PINSTECH, P. O. Nilore, Islamabad (Pakistan)

2014-02-15T23:59:59.000Z

473

An experimental investigation of the solubility and complexing of nickel in the system NiO-HCl-H?O-NaCl  

E-Print Network [OSTI]

AN EXPERIMENTAL INVESTIGATION OF THE SOLUBILITY AND COMPLEXING OF NICKEL IN THE SYSTEM NiO-HC1-H20-NaC1 A Thesis by LYNNE SHIRLEY FAHLQUIST Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements... of Nickel in the System NiO-HC1-H20-NaCI Lynne Shirley Fahlquist, B. S. , Texas AdtM University Chairman of Advisory Committee: Dr, Robert K. Popp The solubility of NiO was determined in both NaCl-free and NaC1-bearing systems in the range 550-750'C, 2...

Fahlquist, Lynne Shirley

2012-06-07T23:59:59.000Z

474

The PUCOT for measuring dynamic Young's modulus for the B?-CoAl, FeAl and NiAl alloys  

E-Print Network [OSTI]

THE PUCOT FOR MEASURIN' DYNAMIC YOUNG'S MODULUS FOR THE B2-CoA1, FeA1 AND NiA1 ALLOYS A Thesis by MAHMOUD REDWAN HARMOUCHE Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree... function of Ni (in atomic %) is shown in Fig. 4. 4. Again, the data have been analyzed using LRA. An excellent fit to a straight line was found where the correlation between p and X3 is: pN Al = 2268. 64 + 71. 06 (X3) + 12. 02 kg/m 3 NiA1 with R...

Harmouche, Mahmoud Redwan

2012-06-07T23:59:59.000Z

475

A p-type Heusler compound: Growth, structure, and properties of epitaxial thin NiYBi films on MgO(100)  

SciTech Connect (OSTI)

Epitaxial semiconducting NiYBi thin films were directly prepared on MgO(100) substrates by magnetron sputtering. The intensity ratio of the (200) and (400) diffraction peaks, I(200)/I(400) = 2.93, was close to the theoretical value (3.03). The electronic structure of NiYBi was calculated using wien2k, and a narrow indirect band gap of width of 210 meV was found. The valence band spectra of the films obtained by linear dichroism in hard x-ray photoelectron spectroscopy exhibit clear structures that are in good agreement with the calculated band structure of NiYBi.

Shan Rong [Institut fuer Anorganische und Analytische Chemie, Johannes Gutenberg - Universitaet, 55099 Mainz (Germany); IBM Almaden Research Center, San Jose, California 95120 (United States); Ouardi, Siham; Fecher, Gerhard H.; ViolBarbosa, Carlos E.; Felser, Claudia [Max Planck Institute for Chemical Physics of Solids, 01187 Dresden (Germany); Gao Li; Kellock, Andrew; Parkin, Stuart S. P. [IBM Almaden Research Center, San Jose, California 95120 (United States); Gloskovskii, Andrei [Institut fuer Anorganische und Analytische Chemie, Johannes Gutenberg - Universitaet, 55099 Mainz (Germany); Ikenaga, Eiji [Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Hyogo 679-5198 (Japan)

2012-11-19T23:59:59.000Z

476

X-ray-diffraction determination of the Ni-dopant site in single-crystal YBa2Cu3O7-?  

Science Journals Connector (OSTI)

Anomalous dispersive x-ray-diffraction measurements have determined the dopant-site distribution in Ni-doped single crystals of the high-temperature superconductor YBa2Cu3O7-?. The data from a YBa2(Cu0.83Ni0.17)3O7-? crystal show that over 95% of the Ni dopants occupy the Cu(2) site in the copper oxide planes, with negligible occupation of the Cu(1) copper oxide chain sites. General guidelines are presented for selecting the most effective hkl diffraction planes for measuring dopant concentration profiles. Direct measurement of the energy dependence of the dopant atomic scattering forces is also demonstrated.

S. A. Hoffman; M. A. Castro; G. C. Follis; S. M. Durbin

1994-05-01T23:59:59.000Z

477

CeO2 Promoted Ni/Al2O3 Catalyst in Combined Steam and Carbon Dioxide Reforming of Methane for Gas to Liquid (GTL) Process  

Science Journals Connector (OSTI)

The effect of ceria promotion over Ni/Al2O3...catalysts on the catalytic activity and coke formation was investigated in combined steam and carbon dioxide reforming of methane (CSCRM) to produce synthesis gas (H2

Kee Young Koo; Hyun-Seog Roh; Un Ho Jung; Wang Lai Yoon

2009-06-01T23:59:59.000Z

478

Promoting Effect of Pt on Self-activation over NiO–MgO Solid Solution in Oxidative Steam Reforming of Methane  

Science Journals Connector (OSTI)

The addition of Pt on NiO–MgO solid solution enhanced the performance of oxidative steam reforming of methane, especially, the catalyst can be activated during the oxidative reforming of methane at low reaction t...

Mohammad Nurunnabi; Baitao Li; Kimio Kunimori; Kimihito Suzuki…

2005-10-01T23:59:59.000Z

479

High-precision B(E2) measurements of semi-magic 58,60,62,64Ni by Coulomb excitation  

SciTech Connect (OSTI)

High-precision reduced electric-quadrupole transition probabilities B(E2) have been measured from single-step Coulomb excitation of semi-magic 58,60,62,64 Ni (Z = 28) beams at 1.8 MeV per nucleon on a natural carbon target. The energy loss of the nickel beams through the carbon target were directly measured with a zero-degree Bragg detector and the absolute B(E2) values were normalized by Rutherford scattering. The B(E2) values disagree with recent lifetime studies that employed the Doppler-shift attenuation method. The present high-precision B(E2) values reveal an asymmetry about 62 Ni, midshell between N = 28 and 40, with larger values towards 56 Ni (Z = N = 28). The experimental B(E2) values are compared with shell-model calculations in the full pf model space and the results indicate a soft 56 Ni core.

Allmond, James M [ORNL; Brown, Alex [National Superconducting Cyclotron Laboratory (NSCL), Michigan State University; Stuchbery, Andrew E [ORNL; Galindo-Uribarri, Alfredo {nmn} [ORNL; Padilla-Rodal, Elizabeth [Universidad Nacional Autonoma de Mexico (UNAM); Radford, David C [ORNL; Batchelder, J. C. [Oak Ridge Associated Universities (ORAU); Howard, Meredith E [ORNL; Liang, J Felix [ORNL; Manning, Brett M [ORNL; Varner Jr, Robert L [ORNL; Yu, Chang-Hong [ORNL

2014-01-01T23:59:59.000Z

480

Ab-initio First Principle Modeling of Structural and Magnetic Phase Transformations in Co-Ni-Al Based Shape Memory Alloys  

E-Print Network [OSTI]

. These magnetic properties are mainly attributed to the martensitic structural phase trans- formation these material experience in response to temperature variation. Co-Ni-Al based alloys are one of the most promising ferromagnetic shape memory alloy FSMA that has...

Thawabi, Hassan S

2013-04-16T23:59:59.000Z

Note: This page contains sample records for the topic "ura ni um" 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

X-ray study of the roughening transition of the Ni(113) surface I. K. Robinson (1), E. H. Conrad (2) and D. S. Reed (2)  

E-Print Network [OSTI]

103 X-ray study of the roughening transition of the Ni(113) surface I. K. Robinson (1), E. H at the roughening temperature, TR, first suggested by Burton and Cabrera [2]. This is known to occur in electron

Paris-Sud XI, Université de

482

Growth behavior and field-induced diffusion of Ni clusters/particles on SrTiO3 (001) observed by UHV-TEM/STM  

Science Journals Connector (OSTI)

The fundamental and technological importance of metal clusters and particles on oxide surfaces is growing. Here, room temperature deposited Ni clusters and particles on clean SrTiO3 (001) surfaces were analyzed w...

Miyoko Tanaka

2013-09-01T23:59:59.000Z

483

Comparative study on kinetic adsorption of Cu(II), Cd(II) and Ni(II) ions from aqueous solutions using activated sludge and dried sludge  

Science Journals Connector (OSTI)

The adsorption of Cu(II), Cd(II) and Ni(II) ions from aqueous solutions by activated sludge and dried sludge was investigated under laboratory conditions to assess ... The adsorption behavior of metal ions onto a...

Soon-An Ong; Eiichi Toorisaka; Makoto Hirata; Tadashi Hano

2013-03-01T23:59:59.000Z