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


1

Method for fabricating an ignitable heterogeneous stratified metal structure  

DOE Patents [OSTI]

A multilayer structure has a selectable, (i) propagating reaction front velocity V, (ii) reaction initiation temperature attained by application of external energy and (iii) amount of energy delivered by a reaction of alternating unreacted layers of the multilayer structure. Because V is selectable and controllable, a variety of different applications for the multilayer structures are possible, including but not limited to their use as ignitors, in joining applications, in fabrication of new materials, as smart materials and in medical applications and devices. The multilayer structure has a period D, and an energy release rate constant K. Two or more alternating unreacted layers are made of different materials and separated by reacted zones. The period D is equal to a sum of the widths of each single alternating reaction layer of a particular material, and also includes a sum of reacted zone widths, t.sub.i, in the period D. The multilayer structure has a selectable propagating reaction front velocity V, where V=K(1/D.sup.n).times.[1-(t.sub.i /D)]and n is about 0.8 to 1.2.

Barbee, Jr., Troy W. (Palo Alto, CA); Weihs, Timothy (Menlo Park, CA)

1996-01-01T23:59:59.000Z

2

Method for fabricating an ignitable heterogeneous stratified metal structure  

DOE Patents [OSTI]

A multilayer structure has a selectable: (1) propagating reaction front velocity V; (2) reaction initiation temperature attained by application of external energy; and (3) amount of energy delivered by a reaction of alternating unreacted layers of the multilayer structure. Because V is selectable and controllable, a variety of different applications for the multilayer structures are possible, including but not limited to their use as igniters, in joining applications, in fabrication of new materials, as smart materials and in medical applications and devices. The multilayer structure has a period D, and an energy release rate constant K. Two or more alternating unreacted layers are made of different materials and separated by reacted zones. The period D is equal to a sum of the widths of each single alternating reaction layer of a particular material, and also includes a sum of reacted zone widths, t{sub i}, in the period D. The multilayer structure has a selectable propagating reaction front velocity V, where V=K(1/D{sup n}){times}[1-(t{sub i}/D)] and n is about 0.8 to 1.2. 8 figs.

Barbee, T.W. Jr.; Weihs, T.

1996-08-20T23:59:59.000Z

3

MECS 2006- Fabricated Metals  

Broader source: Energy.gov [DOE]

Manufacturing Energy and Carbon Footprint for Fabricated Metals (NAICS 332) Sector with Total Energy Input, October 2012 (MECS 2006)

4

Fabricated Metals (2010 MECS)  

Broader source: Energy.gov [DOE]

Manufacturing Energy and Carbon Footprint for Fabricated Metals Sector (NAICS 332) Energy use data source: 2010 EIA MECS (with adjustments) Footprint Last Revised: February 2014

5

Directed light fabrication of refractory metals  

SciTech Connect (OSTI)

Directed Light Fabrication (DLF) is a metal, rapid fabrication process that fuses metal powders to full density into a solid replica of a computer modeled component. It has been shown feasible for forming nearly any metal and also intermetallics to near net shape with a single process. DLF of refractory pure metals is feasible, bypassing the extensive series of conventional processing steps used for processing these high melting point materials. Tungsten, tantalum, and rhenium were processed and show a continuous resolidified microstructure. Porosity was a problem for the tantalum and rhenium powders produced by chemical reduction processes but not for the tungsten powder spherodized in a plasma arc. Chemical analysis of powder compared to the DLF deposit showed reductions in carbon, oxygen and hydrogen, indicating that process parameters may also be optimized for evolution of residual gases in the deposits.

Lewis, G.K.; Thoma, D.J.; Nemec, R.B.; Milewski, J.O. [Los Alamos National Lab., NM (United States). Materials Science and Technology Div.

1997-11-01T23:59:59.000Z

6

The design and construction of fabric structures  

E-Print Network [OSTI]

In its short history, fabric structures have fascinated architects and engineers alike. Architects appreciate their unusual shapes and forms while engineers delight in their "pure" structural expression. Capable of spanning ...

Fang, Rosemarie

2009-01-01T23:59:59.000Z

7

Directed Light Fabrication of Refractory Metals and Alloys  

SciTech Connect (OSTI)

This report covers work performed under Order No. FA0000020 AN Contract DE-AC12-76SN00052 for deposition of refractory pure metals and alloys using the Directed Light Fabrication (DLF) process and represents the progress in depositing these materials through September 1998. In extending the DLF process technology to refractory metals for producing fully dense, structurally sound deposits, several problems have become evident. 1. Control of porosity in DLF-deposited refractory metal is difficult because of gases, apparently present in commercially purchased refractory metal powder starting materials. 2. The radiant heat from the molten pool during deposition melts the DLF powder feed nozzle. 3. The high reflectivity of molten refractory metals, at the Nd-YAG laser wavelength (1.06{micro}m), produces damaging back reflections to the optical train and fiber optic delivery system that can terminate DLF processing. 4. The current limits on the maximum available laser power to prevent back reflection damage limit the parameter range available for densification of refractory metals. The work to date concentrated on niobium, W-25Re, and spherodized tungsten. Niobium samples, made from hydride-dehydride powder, had minimal gas porosity and the deposition parameters were optimized; however, test plates were not made at this time. W-25Re samples, containing sodium and potassium from a precipitation process, were made and porosity was a problem for all samples although minimized with some process parameters. Deposits made from potassium reduced tungsten that was plasma spherodized were made with minimized porosity. Results of this work indicate that further gas analysis of starting powders and de-gassing of starting powders and/or gas removal during deposition of refractory metals is required.

Fonseca, J.C.; Lewis, G.K.; Dickerson, P.G.; Nemec, R.B.

1999-05-14T23:59:59.000Z

8

Directed light fabrication of refractory metals and alloys  

SciTech Connect (OSTI)

This report covers deposition of refractory pure metals and alloys using the Directed Light Fabrication (DLF) process and represents progress in depositing these materials through September 1998. In extending the DLF process technology to refractory metals for producing fully dense, structurally sound deposits, several problems have become evident. (1) Control of porosity in DLF-deposited refractory metal is difficult because of gases, apparently present in commercially purchased refractory metal powder starting materials. (2) The radiant heat from the molten pool during deposition melts the DLF powder feed nozzle. (3) The high reflectivity of molten refractory metals, at the Nd-YAG laser wavelength (1.06{micro}m), produces damaging back reflections to the optical train and fiber optic delivery system that can terminate DLF processing. (4) The current limits on the maximum available laser power to prevent back reflection damage limit the parameter range available for densification of refractory metals. The work to date concentrated on niobium, W-25Re, and spherodized tungsten. Niobium samples, made from hydride-dehydride powder, had minimal gas porosity and the deposition parameters were optimized; however, test plates were not made at this time. W-25Re samples, containing sodium and potassium from a precipitation process, were made and porosity was a problem for all samples although minimized with some process parameters. Deposits made from potassium reduced tungsten that was plasma spherodized were made with minimized porosity. Results of this work indicate that further gas analysis of starting powders and de-gassing of starting powders and/or gas removal during deposition of refractory metals is required.

Fonseca, J.C.; Lewis, G.K.; Dickerson, P.G.; Nemec, R.B.

1999-05-30T23:59:59.000Z

9

Low resistance barrier layer for isolating, adhering, and passivating copper metal in semiconductor fabrication  

SciTech Connect (OSTI)

Cubic or metastable cubic refractory metal carbides act as barrier layers to isolate, adhere, and passivate copper in semiconductor fabrication. One or more barrier layers of the metal carbide are deposited in conjunction with copper metallizations to form a multilayer characterized by a cubic crystal structure with a strong (100) texture. Suitable barrier layer materials include refractory transition metal carbides such as vanadium carbide (VC), niobium carbide (NbC), tantalum carbide (TaC), chromium carbide (Cr.sub.3 C.sub.2), tungsten carbide (WC), and molybdenum carbide (MoC).

Weihs, Timothy P. (Baltimore, MD); Barbee, Jr., Troy W. (Palto Alto, CA)

2002-01-01T23:59:59.000Z

10

Methods for freeform fabrication of structures  

DOE Patents [OSTI]

Rapid prototyping methods and apparatuses that produce structures made of continuous-fiber polymer-matrix composites without the use of molds. Instead of using molds, the composite structure is fabricated patch by patch in layers or wraps, using a two- or three-axis stage connected to a rapidly-reconfigurable forming surface, and a robot arm to position the evolving composite structure, which are both programmable devices. Because programmable devices are included, i.e., a robot and a two- or three-axis stage connected to the reconfigurable forming surface, the control program needed to produce a desired shape can be easily modified to automatically generate the desired shape from an electronic model (e.g., using a CAD/CAM system) of the desired (predetermined) shape.

Kaufman, Stephen G. (Albuquerque, NM); Spletzer, Barry L. (Albuquerque, NM)

2000-01-01T23:59:59.000Z

11

Method of fabricating a honeycomb structure  

DOE Patents [OSTI]

A method of fabricating a monolithic honeycomb structure product involves shaping a first mixture of raw materials and a binder into a green honeycomb, extruding a second mixture of raw materials and a binder into one or more green members that each define an opening extending longitudinally therethrough. The raw materials of the second mixture are compatible with the raw materials of the first mixture. The green honeycomb and member(s) are dried. The binders of the green honeycomb and member(s) are softened at the surfaces that are to be bonded. The green member(s) is inserted into the honeycomb and bonded to the honeycomb to form an assembly thereof, which is then dried and fired to form a unified monolithic honeycomb structure. The insertion is best carried out by mounting a member in the shape of a tube on a mandrel, and inserting the mandrel into the honeycomb opening to bond the tube to the honeycomb. 7 figs.

Holleran, L.M.; Lipp, G.D.

1999-08-03T23:59:59.000Z

12

Method of fabricating a honeycomb structure  

DOE Patents [OSTI]

A method of fabricating a monolithic honeycomb structure product involves shaping a first mixture of raw materials and a binder into a green honeycomb, extruding a second mixture of raw materials and a binder into one or more green members that each define an opening extending longitudinally therethrough. The raw materials of the second mixture are compatible with the raw materials of the first mixture. The green honeycomb and member(s) are dried. The binders of the green honeycomb and member(s) are softened at the surfaces that are to be bonded. The green member(s) is inserted into the honeycomb and bonded to the honeycomb to form an assembly thereof, which is then dried and fired to form a unified monolithic honeycomb structure. The insertion is best carried out by mounting a member in the shape of a tube on a mandrel, and inserting the mandrel into the honeycomb opening to bond the tube to the honeycomb.

Holleran, Louis M. (Big Flats, NY); Lipp, G. Daniel (Fort Collins, CO)

1999-01-01T23:59:59.000Z

13

Corrosion resistance of transmission structures fabricated from weathering steel  

SciTech Connect (OSTI)

Introduced to utilities in the late 1960's, weathering steel' appeared to offer a way to reduce structure weight and maintenance of lattice towers through the application of bare, high strength steel that had natural corrosion resistance. Weathering steel found wide application in lattice and tubular transmission structures. Through its service life, however, the weathering steel showed evidence of continuing corrosion rather than the expected protection from corrosion. A consortium of utilities was formed to investigate the impact on structure reliability of the continuing corrosion of the steel beyond initial expectations. Through the completion of field surveys and laboratory tests, projected lifetime corrosion rates, structural integrity and potential sealer/penetrant systems were evaluated. The investigation has shown that existing lattice and tubular structures fabricated from weathering steel will provide continued reliable service with minimal maintenance programs. Weathering Steel remains practical for new lattice and tubular structures provided steps are taken during the design process to minimize the retention and collection of moisture between and around metal contact surfaces and during the operation of the line to minimize vegetation encroachment around structures.

Goodwin, E.J. (Sverdrup Technology TLMRC, Haslet, TX (United States)); Pohlman, J.C.

1993-01-01T23:59:59.000Z

14

Development of metallic substrate supported planar solid oxide fuel cells fabricated by atmospheric plasma spraying  

Science Journals Connector (OSTI)

A planar solid oxide fuel cell (SOFC) consisting of a cell supported with a porous metallic substrate and a metallic separator has been developed. In the fabrication of the cell, anodes and electrolytes were form...

Shunji Takenoiri; Naruaki Kadokawa; Kazuo Koseki

2000-09-01T23:59:59.000Z

15

Fabrication of high aspect ratio silicon nanostructure arrays by metal-assisted etching  

E-Print Network [OSTI]

The goal of this research was to explore and understand the mechanisms involved in the fabrication of silicon nanostructures using metal-assisted etching. We developed a method utilizing metal-assisted etching in conjunction ...

Chang, Shih-wei, Ph.D. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

16

Three-dimensional Composite Lattice Structures Fabricated by Electrical Discharge Machining  

E-Print Network [OSTI]

construction by means of electrical discharge machining (EDM). First, flat- top corrugated carbon fiber. In this paper, we used electrical discharge machining (EDM)--previously used to transform corrugated metallicThree-dimensional Composite Lattice Structures Fabricated by Electrical Discharge Machining J

Vaziri, Ashkan

17

Metal Can and Bottle FabricationMetal Can and Bottle Fabrication ME 4210: Manufacturing Processes and Engineering  

E-Print Network [OSTI]

;Metal BottlesMetal Bottles ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton © GIT 2009

Colton, Jonathan S.

18

Fabrication of Emissible Metallic Layer-by-Layer Photonic Crystals...  

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

Solar Thermal Solar Thermal Solar Photovoltaic Solar Photovoltaic Building Energy Efficiency Building Energy Efficiency Find More Like This Return to Search Fabrication of...

19

Microstructure and characteristics of the metalceramic composite (MgCa-HA/TCP) fabricated by liquid metal infiltration  

E-Print Network [OSTI]

in calcium phosphate bioceramics. Recently metal matrix composites (MMC), consisting of an adequate ceramicMicrostructure and characteristics of the metal­ceramic composite (MgCa-HA/TCP) fabricated and characteristics of the metal­ ceramic composite (MgCa-HA/TCP) fabricated by liquid metal infiltration. J Biomed

Zheng, Yufeng

20

MICROSCALE THREE-DIMENSIONAL HEMISPHERICAL SHELL RESONATORS FABRICATED FROM METALLIC GLASS  

E-Print Network [OSTI]

MICROSCALE THREE-DIMENSIONAL HEMISPHERICAL SHELL RESONATORS FABRICATED FROM METALLIC GLASS M. Kanik.S. Abstract-- A novel use of bulk metallic glasses in microresonator applications is reported and a method scale glass blowmolding using quartz [2] and Pyrex [3], as well as the isotropic etching of silicon

M'Closkey, Robert T.

Note: This page contains sample records for the topic "fabricated structural metal" 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

Freeform fabrication of polymer-matrix composite structures  

SciTech Connect (OSTI)

The authors have developed, prototyped, and demonstrated the feasibility of a novel robotic technique for rapid fabrication of composite structures. Its chief innovation is that, unlike all other available fabrication methods, it does not require a mold. Instead, the structure is built patch by patch, using a rapidly reconfigurable forming surface, and a robot to position the evolving part. Both of these components are programmable, so only the control software needs to be changed to produce a new shape. Hence it should be possible to automatically program the system to produce a shape directly from an electronic model of it. It is therefore likely that the method will enable faster and less expensive fabrication of composites.

Kaufman, S.G.; Spletzer, B.L.; Guess, T.L.

1997-05-01T23:59:59.000Z

22

Utilizing Metalized Fabrics for Liquid and Rip Detection and Localization  

SciTech Connect (OSTI)

This paper proposes a novel technique for utilizing conductive textiles as a distributed sensor for detecting and localizing liquids (e.g., blood), rips (e.g., bullet holes), and potentially biosignals. The proposed technique is verified through both simulation and experimental measurements. Circuit theory is utilized to depict conductive fabric as a bounded, near-infinite grid of resistors. Solutions to the well-known infinite resistance grid problem are used to confirm the accuracy and validity of this modeling approach. Simulations allow for discontinuities to be placed within the resistor matrix to illustrate the effects of bullet holes within the fabric. A real-time experimental system was developed that uses a multiplexed Wheatstone bridge approach to reconstruct the resistor grid across the conductive fabric and detect liquids and rips. The resistor grid model is validated through a comparison of simulated and experimental results. Results suggest accuracy proportional to the electrode spacing in determining the presence and location of discontinuities in conductive fabric samples. Future work is focused on refining the experimental system to provide more accuracy in detecting and localizing events as well as developing a complete prototype that can be deployed for field testing. Potential applications include intelligent clothing, flexible, lightweight sensing systems, and combat wound detection.

Holland, Stephen [University of Tennessee, Knoxville (UTK); Mahan, Cody [Western Kentucky University; Kuhn, Michael J [ORNL; Rowe, Nathan C [ORNL

2013-01-01T23:59:59.000Z

23

Electrical and structural characterization of metal germanides.  

E-Print Network [OSTI]

??Metal-semiconductor contacts have been widely studied in the past 60 years. These structures are of importance in the microelectronics industry. As the scaling down of (more)

Chawanda, Albert

2011-01-01T23:59:59.000Z

24

Electromagnetic modes in metal-insulator-metal structures  

Science Journals Connector (OSTI)

Metal-dielectric-metal structures are constructed by depositing Ag films on CaF2 thin films that coat Ag surfaces. The reflectance of such structures was measured for several angles of incidence in the 15-eV spectral range. The minima observed in the reflectance are due to the excitation of electromagnetic modes inside an optical cavity. These observed electromagnetic modes are discussed and compared to computed dispersion.

F. Villa; T. Lopez-Rios; L. E. Regalado

2001-04-02T23:59:59.000Z

25

Fabrication of Pillar-Structured Thermal Neutron Detectors  

SciTech Connect (OSTI)

Pillar detector is an innovative solid state device structure that leverages advanced semiconductor fabrication technology to produce a device for thermal neutron detection. State-of-the-art thermal neutron detectors have shortcomings in achieving simultaneously high efficiency, low operating voltage while maintaining adequate fieldability performance. By using a 3-dimensional silicon PIN diode pillar array filled with isotopic boron 10, ({sup 10}B) a high efficiency device is theoretically possible. The fabricated pillar structures reported in this work are composed of 2 {micro}m diameter silicon pillars with a 4 {micro}m pitch and pillar heights of 6 and 12 {micro}m. The pillar detector with a 12 {micro}m height achieved a thermal neutron detection efficiency of 7.3% at 2V.

Nikolic, R J; Conway, A M; Reinhardt, C E; Graff, R T; Wang, T F; Deo, N; Cheung, C L

2007-11-19T23:59:59.000Z

26

Post weld heat treatment of offshore structures -- A fabricators viewpoint  

SciTech Connect (OSTI)

The operation involving post weld heat treatment (PWHT) of certain components during the fabrication of offshore structures has been a contentious issue since its inception. It has been driven by parent material property requirements, inadequacy of early welding consumables, lack of fundamental performance data and, as a result, over conservative engineering. It inherited procedures generally derived from the pressure vessel industry and until relatively recently did not receive specialized attention. The history of the route by which the current regulations or guidelines have been derived is clearly explained in other dissertations. This paper attempts to explain the ramifications of the current situation as seen by a fabricator. At first sight it may appear a relatively simple exercise which does not create fundamental problems. Unfortunately this is not the situation.

Lochhead, J.C.

1996-12-01T23:59:59.000Z

27

High performance capacitors using nano-structure multilayer materials fabrication  

DOE Patents [OSTI]

A high performance capacitor is fabricated from nano-structure multilayer materials, such as by controlled, reactive sputtering, and having very high energy-density, high specific energy and high voltage breakdown. The multilayer capacitors, for example, may be fabricated in a ``notepad`` configuration composed of 200-300 alternating layers of conductive and dielectric materials so as to have a thickness of 1 mm, width of 200 mm, and length of 300 mm, with terminals at each end of the layers suitable for brazing, thereby guaranteeing low contact resistance and high durability. The notepad capacitors may be stacked in single or multiple rows (series-parallel banks) to increase the voltage and energy density. 5 figs.

Barbee, T.W. Jr.; Johnson, G.W.; O`Brien, D.W.

1995-05-09T23:59:59.000Z

28

High performance capacitors using nano-structure multilayer materials fabrication  

DOE Patents [OSTI]

A high performance capacitor fabricated from nano-structure multilayer materials, such as by controlled, reactive sputtering, and having very high energy-density, high specific energy and high voltage breakdown. The multilayer capacitors, for example, may be fabricated in a "notepad" configuration composed of 200-300 alternating layers of conductive and dielectric materials so as to have a thickness of 1 mm, width of 200 mm, and length of 300 mm, with terminals at each end of the layers suitable for brazing, thereby guaranteeing low contact resistance and high durability. The "notepad" capacitors may be stacked in single or multiple rows (series-parallel banks) to increase the voltage and energy density.

Barbee, Jr., Troy W. (Palo Alto, CA); Johnson, Gary W. (Livermore, CA); O'Brien, Dennis W. (Livermore, CA)

1995-01-01T23:59:59.000Z

29

High performance capacitors using nano-structure multilayer materials fabrication  

DOE Patents [OSTI]

A high performance capacitor is described which is fabricated from nano-structure multilayer materials, such as by controlled, reactive sputtering, and having very high energy-density, high specific energy and high voltage breakdown. The multilayer capacitors, for example, may be fabricated in a ``notepad`` configuration composed of 200--300 alternating layers of conductive and dielectric materials so as to have a thickness of 1 mm, width of 200 mm, and length of 300 mm, with terminals at each end of the layers suitable for brazing, thereby guaranteeing low contact resistance and high durability. The ``notepad`` capacitors may be stacked in single or multiple rows (series-parallel banks) to increase the voltage and energy density. 5 figs.

Barbee, T.W. Jr.; Johnson, G.W.; O`Brien, D.W.

1996-01-23T23:59:59.000Z

30

High performance capacitors using nano-structure multilayer materials fabrication  

DOE Patents [OSTI]

A high performance capacitor fabricated from nano-structure multilayer materials, such as by controlled, reactive sputtering, and having very high energy-density, high specific energy and high voltage breakdown. The multilayer capacitors, for example, may be fabricated in a "notepad" configuration composed of 200-300 alternating layers of conductive and dielectric materials so as to have a thickness of 1 mm, width of 200 mm, and length of 300 mm, with terminals at each end of the layers suitable for brazing, thereby guaranteeing low contact resistance and high durability. The "notepad" capacitors may be stacked in single or multiple rows (series-parallel banks) to increase the voltage and energy density.

Barbee, Jr., Troy W. (Palo Alto, CA); Johnson, Gary W. (Livermore, CA); O'Brien, Dennis W. (Livermore, CA)

1996-01-01T23:59:59.000Z

31

Structures having enhanced biaxial texture and method of fabricating same  

DOE Patents [OSTI]

A biaxially textured article includes a rolled and annealed, biaxially textured substrate of a metal having a face-centered cubic, body-centered cubic, or hexagonal close-packed crystalline structure; and an epitaxial superconductor or other device epitaxially deposited thereon. 11 figs.

Goyal, A.; Budai, J.D.; Kroeger, D.M.; Norton, D.P.; Specht, E.D.; Christen, D.K.

1999-04-27T23:59:59.000Z

32

Structures having enhanced biaxial texture and method of fabricating same  

DOE Patents [OSTI]

A biaxially textured article includes a rolled and annealed, biaxially textured substrate of a metal having a face-centered cubic, body-centered cubic, or hexagonal close-packed crystalline structure; and an epitaxial superconductor or other device epitaxially deposited thereon. 11 figs.

Goyal, A.; Budai, J.D.; Kroeger, D.M.; Norton, D.P.; Specht, E.D.; Christen, D.K.

1998-04-21T23:59:59.000Z

33

Structures having enhanced biaxial texture and method of fabricating same  

DOE Patents [OSTI]

A biaxially textured article includes a rolled and annealed, biaxially textured substrate of a metal having a face-centered cubic, body-centered cubic, or hexagonal close-packed crystalline structure; and an epitaxial superconductor or other device epitaxially deposited thereon. 11 figs.

Goyal, A.; Budai, J.D.; Kroeger, D.M.; Norton, D.P.; Specht, E.D.; Christen, D.K.

1998-04-14T23:59:59.000Z

34

Studies on metal-dielectric plasmonic structures.  

SciTech Connect (OSTI)

The interaction of light with nanostructured metal leads to a number of fascinating phenomena, including plasmon oscillations that can be harnessed for a variety of cutting-edge applications. Plasmon oscillation modes are the collective oscillation of free electrons in metals under incident light. Previously, surface plasmon modes have been used for communication, sensing, nonlinear optics and novel physics studies. In this report, we describe the scientific research completed on metal-dielectric plasmonic films accomplished during a multi-year Purdue Excellence in Science and Engineering Graduate Fellowship sponsored by Sandia National Laboratories. A variety of plasmonic structures, from random 2D metal-dielectric films to 3D composite metal-dielectric films, have been studied in this research for applications such as surface-enhanced Raman sensing, tunable superlenses with resolutions beyond the diffraction limit, enhanced molecular absorption, infrared obscurants, and other real-world applications.

Chettiar, Uday K. (Purdue University, West Lafayette, IN); Liu, Zhengtong (Purdue University, West Lafayette, IN); Thoreson, Mark D. (Purdue University, West Lafayette, IN); Shalaev, Vladimir M. (Purdue University, West Lafayette, IN); Drachev, Vladimir P. (Purdue University, West Lafayette, IN); Pack, Michael Vern; Kildishev, Alexander V. (Purdue University, West Lafayette, IN); Nyga, Piotr (Purdue University, West Lafayette, IN)

2010-01-01T23:59:59.000Z

35

Advanced fabrication techniques for hydrogen-cooled engine structures. Final report, October 1975-June 1982  

SciTech Connect (OSTI)

Described is a program for development of coolant passage geometries, material systems, and joining processes that will produce long-life hydrogen-cooled structures for scramjet applications. Tests were performed to establish basic material properties, and samples constructed and evaluated to substantiate fabrication processes and inspection techniques. Results of the study show that the basic goal of increasing the life of hydrogen-cooled structures two orders of magnitude relative to that of the Hypersonic Research Engine can be reached with available means. Estimated life is 19000 cycles for the channels and 16000 cycles for pin-fin coolant passage configurations using Nickel 201. Additional research is required to establish the fatigue characteristics of dissimilar-metal coolant passages (Nickel 201/Inconel 718) and to investigate the embrittling effects of the hydrogen coolant.

Buchmann, O.A.; Arefian, V.V.; Warren, H.A.; Vuigner, A.A.; Pohlman, M.J.

1985-11-01T23:59:59.000Z

36

ARIES-CS COIL STRUCTURE ADVANCED FABRICATION APPROACH  

E-Print Network [OSTI]

: ARIES-CS, advanced fabrication, additive manufacturing Note: Some figures in this paper are in color with conventional means would be very challenging and costly. A new fabrication technology is "additive manufac

California at San Diego, University of

37

Nano-Structured Nobel Metal Catalysts  

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

Nobel Metal Catalysts Nobel Metal Catalysts for Hydrocarbon Reforming Opportunity Research is active on the patent pending technology, titled "Nano- Structured Nobel Metal Catalysts Based on Hexametallate Architecture for the Reforming of Hydrocarbon Fuels." This technology is available for licensing and/or further collaborative research from the U.S. Department of Energy's National Energy Technology Laboratory. Overview Methods for generating synthesis gas from hydrocarbon feedstocks routinely involve the use of a catalyst-a material that speeds up the reaction, but itself is not consumed-to make this process economically feasible. Sulfur, higher hydrocarbons, and olefins present a major technical challenge since these components can deactivate conventional

38

Additive Manufacturing Methodology and System for Fabrication of Porous Structures with Functionally Graded Properties.  

E-Print Network [OSTI]

??The focus of this dissertation is on the development of an additive manufacturing system and methodology for fabricating structures with functionally graded porous internal properties (more)

Vlasea, Mihaela

2014-01-01T23:59:59.000Z

39

Synthesis, Structure, and Metalation of Two New Highly Porous...  

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

Synthesis, Structure, and Metalation of Two New Highly Porous Zirconium Metal-Organic Frameworks Previous Next List William Morris, Boris Volosskiy, Selcuk Demir, Felipe Gndara,...

40

Fabrication of nano-structural arrays by channeling pulsed atomic beams through an intensity-modulated  

E-Print Network [OSTI]

Fabrication of nano-structural arrays by channeling pulsed atomic beams through an intensity-dimensional nano-structure arrays by passing a pulsed atomic beam through an intensity-modulated continuous of ``cooling'' along the longitudinal direction. This enables fabrication of vertically heterogeneous nano

Zhu, Xiangdong

Note: This page contains sample records for the topic "fabricated structural metal" 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

Safeguards and security concept for the Secure Automated Fabrication (SAF) and Liquid Metal Reactor (LMR) fuel cycle, SAF line technical support  

SciTech Connect (OSTI)

This report is a safeguards and security concept system review for the secure automated fabrication (SAF) and national liquid metal reactor (LMR) fuel programs.

Schaubert, V.J.; Remley, M.E.; Grantham, L.F.

1986-02-21T23:59:59.000Z

42

Role of Metal Coordination Structures in Enhancement of Electrocatalyt...  

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

Structures in Enhancement of Electrocatalytic Activity of Ternary Nanoalloys for Oxygen Reduction Role of Metal Coordination Structures in Enhancement of Electrocatalytic...

43

Fabrication and crushing behavior of low density carbon fiber composite pyramidal truss structures  

E-Print Network [OSTI]

Fabrication and crushing behavior of low density carbon fiber composite pyramidal truss structures online xxxx Keywords: Sandwich panel Mechanical properties Pyramidal truss Carbon fiber a b s t r a c t A new method for fabricating carbon fiber composite pyramidal truss cores was developed based

Vaziri, Ashkan

44

Ultra-high vacuum fabrication and electrical characterization of environmentally sensitive metal oxide semiconductor capacitors  

SciTech Connect (OSTI)

We describe an integrated, ultra-high vacuum system for metal oxide semiconductor (MOS) device fabrication and characterization. Such a system is advantageous for electrical property measurements of electronic devices consisting of environmentally sensitive materials especially as device dimensions approach the nanoscale. Without exposure to atomosphere, MOS capacitors were fabricated by evaporating gate metal on molecular-beam-epitaxy (MBE) grown dielectrics on 3 inch-diameter substrates through a shadow mask in a UHV electrode-patterning chamber. The finished device is transferred in vacuum to an in-situ, UHV electrical characterization probe station that was designed with standard UHV coaxial feedthroughs and UHV-compatible, Kapton-insulated coaxial cable. The probe station also includes a heated sample stage that allows for annealing and measurements in a controlled ambient. We obtained excellent agreement between air-ambient ex-situ and in-situ probe station measurements utilizing a capacitor standard compatible with UHV based on single crystal sapphire as the dielectric. The measurements show less than 0.3 % dispersion for frequencies from 20 Hz to 1 MHz. We have successfully measured MOS capacitors and are sensitive to a density of interface states of 1x1010 states cm-2 eV-1. These measurements also show 0.5 % dispersion for measurement frequencies from 20 Hz to 1 kHz and less than 0.1 % from 1 kHz to 1 MHz. The integrated system presented here is one where complex, MBE-grown MOS heterostructures can be synthesized and tested rapidly to elucidate new field-effect-device physics and functionality.

Billman, Curt [Oak Ridge National Laboratory (ORNL); Walker, Frederick Joseph [ORNL

2007-01-01T23:59:59.000Z

45

Fabrication of metal matrix composite by semi-solid powder processing  

SciTech Connect (OSTI)

Various metal matrix composites (MMCs) are widely used in the automotive, aerospace and electrical industries due to their capability and flexibility in improving the mechanical, thermal and electrical properties of a component. However, current manufacturing technologies may suffer from insufficient process stability and reliability and inadequate economic efficiency and may not be able to satisfy the increasing demands placed on MMCs. Semi-solid powder processing (SPP), a technology that combines traditional powder metallurgy and semi-solid forming methods, has potential to produce MMCs with low cost and high efficiency. In this work, the analytical study and experimental investigation of SPP on the fabrication of MMCs were explored. An analytical model was developed to understand the deformation mechanism of the powder compact in the semi-solid state. The densification behavior of the Al6061 and SiC powder mixtures was investigated with different liquid fractions and SiC volume fractions. The limits of SPP were analyzed in terms of reinforcement phase loading and its impact on the composite microstructure. To explore adoption of new materials, carbon nanotube (CNT) was investigated as a reinforcing material in aluminum matrix using SPP. The process was successfully modeled for the mono-phase powder (Al6061) compaction and the density and density distribution were predicted. The deformation mechanism at low and high liquid fractions was discussed. In addition, the compaction behavior of the ceramic-metal powder mixture was understood, and the SiC loading limit was identified by parametric study. For the fabrication of CNT reinforced Al6061 composite, the mechanical alloying of Al6061-CNT powders was first investigated. A mathematical model was developed to predict the CNT length change during the mechanical alloying process. The effects of mechanical alloying time and processing temperature during SPP were studied on the mechanical, microstructural and compositional properties of the Al6061-CNT composites. A shear lag model was applied to predict the mechanical property (hardness) of the composite. This work demonstrated the promising potential of SPP in the fabrication of particle/fiber (nanotube) reinforced MMCs.

Wu, Yufeng [Ames Laboratory

2012-11-28T23:59:59.000Z

46

A method for making dendritic metal nanostructures using a surfactant structure template, a metal salt, and electron donor species.  

DOE Patents [OSTI]

A method for making dendritic metal nanostructures using a surfactant structure template, a metal salt, and electron donor species.

Shelnutt, John A. (Tijeras, NM); Song, Yujiang (Albuquerque, NM); Pereira, Eulalia F. (Vila Nova de Gaia, PT); Medforth, Craig J. (Winters, CA)

2008-05-20T23:59:59.000Z

47

Electric field based fabrication methods for multi-scale structured surfaces  

E-Print Network [OSTI]

Control of micro/nano scale surface structures and properties is crucial to developing novel functional materials. From an engineering point of view, the development of scalable and economical micro/nano-fabrication methods ...

Joung, Young Soo

2014-01-01T23:59:59.000Z

48

Design and fabrication of micro- and nano- dielectric structures for imaging and focusing at optical frequencies  

E-Print Network [OSTI]

In this thesis work, design and fabrication of micro- and nano-photonic structures both in the diffraction regime and sub-wavelength regime have been investigated. In the diffraction regime, two types of optical systems ...

Takahashi, Satoshi, Ph. D. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

49

Atomic and electronic structure of simple metal/graphene and complex metal/graphene/metal interfaces  

Science Journals Connector (OSTI)

Structural, electronic, and magnetic properties of simple interfaces (graphene on top of a metallic substrate) and complex interfaces (a single metallic adlayer on a simple graphene/metal system, either on top or between the graphene and metallic substrate) have been studied using density functional theory. Two types of simple interface with strong (Ni/graphene) and weak (Cu/graphene) bonding were considered. In addition to binding energies and interface distances, which are used to quantify the strength of graphene-substrate interactions, the bonding in simple and complex interfaces was analyzed using charge density distributions and bond orders. Substantial enhancement of the metallic substrate/graphene binding was observed in complex interfaces, consisting of a Ni monolayer on top of a simple {Ni or Cu}/graphene interface. The increase of substrate-graphene bonding in such complex interfaces is accompanied by weakening of in-plane C-C bonds in graphene, as quantified by the bond orders. A weak ferrimagnetism in graphene, i.e., unequal magnetic moments ?0.04?B and +0.06?B on the C atoms, is induced by a ferromagnetic Ni substrate. The strength of graphene-substrate interactions is also reflected in simulated scanning tunneling microscopy images.

Lyudmyla Adamska; You Lin; Andrew J. Ross; Matthias Batzill; Ivan I. Oleynik

2012-05-22T23:59:59.000Z

50

Electrical characteristics and thermal stability of HfO{sub 2} metal-oxide-semiconductor capacitors fabricated on clean reconstructed GaSb surfaces  

SciTech Connect (OSTI)

HfO{sub 2}/GaSb interfaces fabricated by high-vacuum HfO{sub 2} deposition on clean reconstructed GaSb surfaces were examined to explore a thermally stable GaSb metal-oxide-semiconductor structure with low interface-state density (D{sub it}). Interface Sb-O bonds were electrically and thermally unstable, and post-metallization annealing at temperatures higher than 200?C was required to stabilize the HfO{sub 2}/GaSb interfaces. However, the annealing led to large D{sub it} in the upper-half band gap. We propose that the decomposition products that are associated with elemental Sb atoms act as interface states, since a clear correlation between the D{sub it} and the Sb coverage on the initial GaSb surfaces was observed.

Miyata, Noriyuki, E-mail: nori.miyata@aist.go.jp; Mori, Takahiro; Yasuda, Tetsuji [National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568 (Japan); Ohtake, Akihiro [National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044 (Japan); Ichikawa, Masakazu [The University of Tokyo, Tokyo 113-8656 (Japan)

2014-06-09T23:59:59.000Z

51

The crystal structure and growth direction of nanowire arraysCu fabricated on a copper surface  

E-Print Network [OSTI]

The crystal structure and growth direction of nanowire arraysCu 2 S fabricated on a copper surface We examine the crystal structure and growth direction of nanowire arrays grown from copper surfaces10 On this line, we have recently discovered that by exposing a surfactant-treated copper surface

Wang, Zhong L.

52

Electronic Structure of Noble-Metal-Noble-Metal Alloys  

Science Journals Connector (OSTI)

We describe optical studies of dilute noble-metal-noble-metal alloys. A differential technique compared the reflectance of the alloy with the reflectance of the pure metal and measured a quantity proportional to just the difference in reflectance. The method was particularly sensitive to small changes in reflectances and could be used to study very dilute alloys-the alloys here were between 110- and 3-at.% impurity concentration. The measurements indicated that the noble alloys are of two types. In copper-gold and silver-gold alloys the electron energy bands shift smoothly as the concentration varies. The rates and directions of shifts are determined not only by differences in the host and impurity potentials, but also by the changes in lattice constant, and we emphasize the importance of the latter. In contrast, in copper-silver alloys separate host and impurity d bands are formed.

David Beaglehole and Erich Erlbach

1972-08-15T23:59:59.000Z

53

Fabrication of Atomic-Scale Structures on Si(001) Surfaces  

Science Journals Connector (OSTI)

...1952), pp. 154-161; C. E. Weaver, Clays, Muds and Shales (Elsevier, Amsterdam, 1989). 30. W. A. DiMichele and...suggests that substrates or ultrathin films that have an anisotropic surface struc-ture consisting of well-separated groupings...

C. T. Salling; M. G. Lagally

1994-07-22T23:59:59.000Z

54

Structure and Function of Microbial Metal-Reduction Proteins  

SciTech Connect (OSTI)

In this project, we proposed (i) identification of metal-reduction genes, (ii) development of new threading techniques and (iii) fold recognition and structure prediction of metal-reduction proteins. However, due to the reduction of the budget, we revised our plan to focus on two specific aims of (i) developing a new threading-based protein structure prediction method, and (ii) developing an expert system for protein structure prediction.

Xu, Ying; Crawford, Oakly H.; Xu, Dong; Larimer, Frank W.; Uberbacher, Edward C.; Zhou, Jizhong

2009-09-02T23:59:59.000Z

55

Multifunctional Structural Supercapacitor Composites Based on Carbon Aerogel Modified High Performance Carbon Fiber Fabric  

Science Journals Connector (OSTI)

Multifunctional Structural Supercapacitor Composites Based on Carbon Aerogel Modified High Performance Carbon Fiber Fabric ... In particular, radical new approaches to energy storage are required to progress toward future zero emission electrical vehicles. ... vehicle attributes and, in particular, the various levels of hybrids. ...

Hui Qian; Anthony R. Kucernak; Emile S. Greenhalgh; Alexander Bismarck; Milo S. P. Shaffer

2013-05-13T23:59:59.000Z

56

Improved Structure and Fabrication of Large, High-Power KHPS Rotors - Final Scientific/Technical Report  

SciTech Connect (OSTI)

Verdant Power, Inc, working in partnership with the National Renewable Energy Laboratory (NREL), Sandia National Laboratories (SNL), and the University of Minnesota St. Anthony Falls Laboratory (SAFL), among other partners, used evolving Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) models and techniques to improve the structure and fabrication of large, high-power composite Kinetic Hydropower System (KHPS) rotor blades. The objectives of the project were to: design; analyze; develop for manufacture and fabricate; and thoroughly test, in the lab and at full scale in the water, the improved KHPS rotor blade.

Corren, Dean [Verdant Power, Inc.; Colby, Jonathan [Verdant Power, Inc.; Adonizio, Mary Ann [Verdant Power, Inc.

2013-01-29T23:59:59.000Z

57

Structure and Function of Microbial Metal-Reduction Proteins  

Office of Scientific and Technical Information (OSTI)

report for "Structure and Function of Microbial Metal-Reduction Proteins" PI: Ying Xu Co-PI: Oakley H. Crawford Dong Xu Frank W Larimer Edward C. Uberbacher Jizhong Zhou...

58

DIVISION 05 METALS 05120 STRUCTURAL STEEL  

E-Print Network [OSTI]

STEEL A. Design Considerations 1. Testing and inspection will be required for structural steel work testing and inspection of structural steel work will be contracted for and paid for by the University, regardless of building class. The A/E must specify all testing and inspection of structural steel

59

A hot isostatic pressing fabrication technique for particulate-reinforced metal matrix composites  

E-Print Network [OSTI]

Recent years have seen the development of a wide range of metal matrix composites (MMCs). Until recently, the primary support for these composites had come from the aerospace and defense industry. Now as current materials reach their performance...

McRea, Shana Aline

2012-06-07T23:59:59.000Z

60

Modeling of pattern dependencies in the fabrication of multilevel copper metallization  

E-Print Network [OSTI]

Multilevel copper metallization for Ultra-Large-Scale-Integrated (ULSI) circuits is a critical technology needed to meet performance requirements for advanced interconnect technologies with sub-micron dimensions. It is ...

Cai, Hong, Ph. D. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" 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

Ternary metal-rich sulfide with a layered structure  

DOE Patents [OSTI]

A ternary Nb-Ta-S compound is provided having the atomic formula, Nb.sub.1.72 Ta.sub.3.28 S.sub.2, and exhibiting a layered structure in the sequence S-M3-M2-M1-M2-M3-S wherein S represents sulfur layers and M1, M2, and M3 represent Nb/Ta mixed metal layers. This sequence generates seven sheets stacked along the [001] direction of an approximate body centered cubic crystal structure with relatively weak sulfur-to-sulfur van der Waals type interactions between adjacent sulfur sheets and metal-to-metal bonding within and between adjacent mixed metal sheets.

Franzen, Hugo F. (Ames, IA); Yao, Xiaoqiang (Ames, IA)

1993-08-17T23:59:59.000Z

62

Fabrication of carbon nanotube films from alkyne-transition metal complexes  

DOE Patents [OSTI]

A simple method for the production or synthesis of carbon nanotubes as free-standing films or nanotube mats by the thermal decomposition of transition metal complexed alkynes with aryl, alkyl, alkenyl, or alkynyl substituents. In particular, transition metal (e.g. Co, Ni, Fe, Mo) complexes of diarylacetylenes, e.g. diphenylacetylene, and solid mixtures of these complexes with suitable, additional carbon sources are heated in a vessel. More specifically, the heating of the transition metal complex is completed at a temperature between 400-800.degree. C. and more particularly 550-700.degree. C. for between 0.1 to 24 hours and more particularly 0.5-3 hours in a sealed vessel under a partial pressure of argon or helium.

Iyer, Vivekanantan S. (Delft, NL); Vollhardt, K. Peter C. (Oakland, CA)

2007-08-28T23:59:59.000Z

63

Fabrication of ultrafine carbon fibers possessing a nanoporous structure from electrospun polyvinyl alcohol fibers containing silica nanoparticles  

Science Journals Connector (OSTI)

Ultrafine carbon fibers with a nanoporous structure were fabricated by the template method using silica nanoparticles (NPs) embedded in fibers of approximate diameter 500 nm, electrospun from an aqueous solution of polyvinyl alcohol, CoCl2, ...

Koichi Sawada, Shinji Sakai, Masahito Taya

2014-01-01T23:59:59.000Z

64

Investigation of a chalcohalide glass optical waveguide structure fabricated by dual-energy carbon-ion implantation  

Science Journals Connector (OSTI)

A planar waveguide structure in a chalcohalide glass was fabricated by dual-energy C ion implantation with energies of 5.5 and 6.0MeV at fluences of 7.01014 and...

Yu, Xiao-Fei; Liu, Tao; Zhang, Lian; Zhou, Yu-Fan; Wang, Tie-Jun; Wang, Xue-Lin

2014-01-01T23:59:59.000Z

65

Electronic structure of Z+1 impurities in metals  

Science Journals Connector (OSTI)

We present a theoretical analysis of the electronic structure of substitutional Z+1 impurities in simple and transition metals. Self-consistent calculations for Mg in Na and Tc in Mo have been performed using the Korringa-Kohn-Rostoker Greens-function formalism, and have been analyzed in terms of a simplified impurity model. At the impurity site a strong redistribution of states for both the occupied and unoccupied levels, in particular for the s and p states in the case of the simple metals and for the d states in the case of the transition metals, is observed. We show that the local electronic structure at the impurity site can be interpreted in terms of the electronic structure of the unperturbed host and two sets of parameters representing the attractive potential and a change in the orbital hybridization.

W. Speier; J. F. van Acker; R. Zeller

1990-02-15T23:59:59.000Z

66

Method for fabricating a seal between a ceramic and a metal alloy  

DOE Patents [OSTI]

A method of fabricating a seal between a ceramic and an alloy comprising the steps of prefiring the alloy in an atmosphere with a very low partial pressure of oxygen, firing the assembled alloy and ceramic in air, and gradually cooling the fired assembly to avoid the formation of thermal stress in the ceramic. The method forms a bond between the alloy and the ceramic capable of withstanding the environment of a pressurized water reactor and suitable for use in an electrical conductivity sensitive liquid level transducer.

Kelsey, P.V. Jr.; Siegel, W.T.

1983-08-16T23:59:59.000Z

67

Method for fabricating a seal between a ceramic and a metal alloy  

DOE Patents [OSTI]

A method of fabricating a seal between a ceramic and an alloy comprising the steps of prefiring the alloy in an atmosphere with a very low partial pressure of oxygen, firing the assembled alloy and ceramic in air, and gradually cooling the fired assembly to avoid the formation of thermal stress in the ceramic. The method forms a bond between the alloy and the ceramic capable of withstanding the environment of a pressurized water reactor and suitable for use in an electrical conductivity sensitive liquid level transducer.

Kelsey, Jr., Paul V. (Idaho Falls, ID); Siegel, William T. (Rigby, ID)

1983-01-01T23:59:59.000Z

68

Fabrication and testing of nano-optical structures for advanced photonics and quantum information processing applications  

E-Print Network [OSTI]

approach : : : : : : : : : : : : : : : : : : : : : : : : : : : 34 xi FIGURE Page 18 Key fabrication steps utilizing e-beam lithography with bi-layer PMMA approach : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 35 19 Key fabrication steps...

Khan, Mughees Mahmood

2009-05-15T23:59:59.000Z

69

Large Scale Laser Two-Photon Polymerization Structuring for Fabrication of Artificial Polymeric Scaffolds for Regenerative Medicine  

SciTech Connect (OSTI)

We present a femtosecond Laser Two-Photon Polymerization (LTPP) system of large scale three-dimensional structuring for applications in tissue engineering. The direct laser writing system enables fabrication of artificial polymeric scaffolds over a large area (up to cm in lateral size) with sub-micrometer resolution which could find practical applications in biomedicine and surgery. Yb:KGW femtosecond laser oscillator (Pharos, Light Conversion. Co. Ltd.) is used as an irradiation source (75 fs, 515 nm (frequency doubled), 80 MHz). The sample is mounted on wide range linear motor driven stages having 10 nm sample positioning resolution (XY--ALS130-100, Z--ALS130-50, Aerotech, Inc.). These stages guarantee an overall travelling range of 100 mm into X and Y directions and 50 mm in Z direction and support the linear scanning speed up to 300 mm/s. By moving the sample three-dimensionally the position of laser focus in the photopolymer is changed and one is able to write complex 3D (three-dimensional) structures. An illumination system and CMOS camera enables online process monitoring. Control of all equipment is automated via custom made computer software ''3D-Poli'' specially designed for LTPP applications. Structures can be imported from computer aided design STereoLihography (stl) files or programmed directly. It can be used for rapid LTPP structuring in various photopolymers (SZ2080, AKRE19, PEG-DA-258) which are known to be suitable for bio-applications. Microstructured scaffolds can be produced on different substrates like glass, plastic and metal. In this paper, we present microfabricated polymeric scaffolds over a large area and growing of adult rabbit myogenic stem cells on them. Obtained results show the polymeric scaffolds to be applicable for cell growth practice. It exhibit potential to use it for artificial pericardium in the experimental model in the future.

Malinauskas, M.; Purlys, V.; Zukauskas, A.; Rutkauskas, M.; Danilevicius, P.; Paipulas, D.; Bickauskaite, G.; Gadonas, R.; Piskarskas, A. [Vilnius University, Physics Faculty, Department of Quantum Electronics, Laser Research Center, Sauletekio ave. 10, LT-10223 Vilnius (Lithuania); Bukelskis, L.; Baltriukiene, D.; Bukelskiene, V. [Institute of Biochemistry, Vivarium, Mokslininkuo str. 12, LT-08662 Vilnius (Lithuania); Sirmenis, R. [Vilnius University Hospital Santariskiuo Klinikos, Santariskiuo g. 2, LT-08661 Vilnius (Lithuania); Gaidukeviciute, A. [Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas, Vassilika Vouton, 711 10 Heraklion, Crete (Greece); Sirvydis, V. [Vilnius University, Faculty of Medicine, Heart Surgery Center, Santariskiuo 2, LT-08661, Vilnius (Lithuania)

2010-11-10T23:59:59.000Z

70

3D PRINTING FOR INTELLIGENT METALLIC STRUCTURES M. Strantza1  

E-Print Network [OSTI]

3D PRINTING FOR INTELLIGENT METALLIC STRUCTURES M. Strantza1 , D. De Baere2 , M. Rombouts3 , SSHM system is produced by 3D printing or additive manufacturing. Additive Manufacturing (AM) is a "process to enable its implementation. This work demonstrates the feasibility study of eSHM systems produced by 3D

Boyer, Edmond

71

Fabrication of Metal/Oxide Nanostructures by Anodization Processes for Biosensor, Drug Delivery and Supercapacitor Applications  

E-Print Network [OSTI]

applications of micro/nano structures; (2) novel processes to innovate anodic aluminum oxide nanotube template; (3) the supercapacitor applications of anodic titanium oxide. First, the extremely high surface area AAO coated microneedle and microneedle array...

Chen, Po-Chun

2014-01-13T23:59:59.000Z

72

ELECTRONIC STRUCTURE IN METALS AND ALLOYS. ELECTRONIC STRUCTURE OF THE LIGHT ACTINIDES  

E-Print Network [OSTI]

ELECTRONIC STRUCTURE IN METALS AND ALLOYS. ELECTRONIC STRUCTURE OF THE LIGHT ACTINIDES B. D. DUNLAP electrons. A review is given of some areas of current interest, especially where hyperfine techniques have the 60 keV y-ray of 237Np[l]. At that time, our understanding of the electronic properties

Boyer, Edmond

73

Toughened and corrosion- and wear-resistant composite structures and fabrication methods thereof  

DOE Patents [OSTI]

Composite structures having a reinforced material interjoined with a substrate and methods of creating a composite material interjoined with a substrate. In some embodiments the composite structure may be a line or a spot or formed by reinforced material interjoined with the substrate. The methods typically include disposing a precursor material comprising titanium diboride and/or titanium monoboride on at least a portion of the substrate and heating the precursor material and the at least a portion of the substrate in the presence of an oxidation preventative until at least a portion of the precursor material forms reinforced material interjoined with the substrate. The precursor material may be disposed on the substrate as a sheet or a tape or a slurry or a paste. Localized surface heating may be used to heat the precursor material. The reinforced material typically comprises a titanium boron compound, such as titanium monoboride, and preferably comprises .beta.-titanium. The substrate is typically titanium-bearing, iron-bearing, or aluminum-bearing. A welding rod is provided as an embodiment. The welding rod includes a metal electrode and a precursor material is disposed adjacent at least a portion of the metal electrode. A material for use in forming a composite structure is provided. The material typically includes a precursor material that includes one or more materials selected from the following group: titanium diboride and titanium monoboride. The material also typically includes a flux.

Seals, Roland D; Ripley, Edward B; Hallman, Russell L

2014-04-08T23:59:59.000Z

74

Fast fabrication of nano-structured anti-reflection layers for enhancement of solar cells performance using plasma sputtering and infrared assisted roller embossing techniques  

Science Journals Connector (OSTI)

This paper reports the continuous fabrication of dual-side nano-structured anti-reflection protective layer for performance enhancement of solar cells using plasma sputtering and...

Liu, Shih-Jung; Liao, Che-Ting

2012-01-01T23:59:59.000Z

75

Trends in elasticity and electronic structure of transition-metal nitrides and carbides from first principles  

E-Print Network [OSTI]

Trends in elasticity and electronic structure of transition-metal nitrides and carbides from first 2005 The elastic properties of selected transition-metal TM nitrides and carbides in B1 structure the transition-metal nitrides and carbides remain unclear and a challenge for engineering hard materials

Wu, Zhigang

76

Stability of Bulk Metallic Glass Structure. Final Report  

SciTech Connect (OSTI)

The fundamental origins of the stability of the (Pd-Ni){sub 80}P{sub 20} bulk metallic glasses (BMGs), a prototype for a whole class of BMG formers, were explored. While much of the properties of their BMGs have been characterized, their glass-stability have not been explained in terms of the atomic and electronic structure. The local structure around all three constituent atoms was obtained, in a complementary way, using extended X-ray absorption fine structure (EXAFS), to probe the nearest neighbor environment of the metals, and extended energy loss fine structure (EXELFS), to investigate the environment around P. The occupied electronic structure was investigated using X-ray photoelectron spectroscopy (XPS). The (Pd-Ni){sub 80}P{sub 20} BMGs receive their stability from cumulative, and interrelated, effects of both atomic and electronic origin. The stability of the (Pd-Ni){sub 80}P{sub 20} BMGs can be explained in terms of the stability of Pd{sub 60}Ni{sub 20}P{sub 20} and Pd{sub 30}Ni{sub 50}P{sub 20}, glasses at the end of BMG formation. The atomic structure in these alloys is very similar to those of the binary phosphide crystals near x=0 and x=80, which are trigonal prisms of Pd or Ni atoms surrounding P atoms. Such structures are known to exist in dense, randomly-packed systems. The structure of the best glass former in this series, Pd{sub 40}Ni{sub 40}P{sub 20} is further described by a weighted average of those of Pd{sub 30}Ni{sub 50}P{sub 20} and Pd{sub 60}Ni{sub 20}P{sub 20}. Bonding states present only in the ternary alloys were found and point to a further stabilization of the system through a negative heat of mixing between Pd and Ni atoms. The Nagel and Tauc criterion, correlating a decrease in the density of states at the Fermi level with an increase in the glass stability, was consistent with greater stability of the Pd{sub x}Ni{sub 80-x}P{sub 20} glasses with respect to the binary alloys of P. A valence electron concentration of 1.8 e/a, which ensures the superpositioning of the first peak in the structure factor with twice the Fermi momentum, was used to calculate the interatomic potential of these alloys. The importance of Pd to the stability of the alloys is evidenced by the fact that replacing Ni and Pd places the nearest neighbor distances at more attractive positions in this potential.

Jain, H.; Williams, D. B.

2003-06-01T23:59:59.000Z

77

Muon method for structural defects investigation in ferromagnetic metals  

Science Journals Connector (OSTI)

Equations describing depolarization of positive muons implanted in a pure crystalline ferromagnetic metal...

L. A. Kuzmin; V. P. Melnichuk; V. Yu. Miloserdin

1986-12-01T23:59:59.000Z

78

Electronic Structure Study of Metallized Carbon Clusters and Silicon Carbide Nanostructures .  

E-Print Network [OSTI]

??Binary structures of carbon with lithium, beryllium, or silicon are predicted using density functional (DFT) methods in the case of the metallized clusters, or tight-binding (more)

Patrick, Anthony D.

2009-01-01T23:59:59.000Z

79

Structural Basis for Metal Binding Specificity: the N-terminal Cadmium Binding Domain of the  

E-Print Network [OSTI]

In bacteria, P1-type ATPases are responsible for resistance to di- and monovalent toxic heavy metals by taking years and no common mechanism for resistance toward toxic heavy metals such as Cd(II), Zn(II), HgStructural Basis for Metal Binding Specificity: the N-terminal Cadmium Binding Domain of the P1

Scott, Robert A.

80

Electronic structure and pairwise interactions in substoichiometric transition metal carbides and nitrides  

E-Print Network [OSTI]

1001 Electronic structure and pairwise interactions in substoichiometric transition metal carbides observations expéri- mentales. Abstract 2014 In substoichiometric transition metal carbides and nitrides This paper is devoted to the study of the ordering processes in substoichiometric transition metal carbi- des

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "fabricated structural metal" 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

Amorphous metal formulations and structured coatings for corrosion and wear resistance  

DOE Patents [OSTI]

A system for coating a surface comprising providing a source of amorphous metal that contains more than 11 elements and applying the amorphous metal that contains more than 11 elements to the surface by a spray. Also a coating comprising a composite material made of amorphous metal that contains more than 11 elements. An apparatus for producing a corrosion-resistant amorphous-metal coating on a structure comprises a deposition chamber, a deposition source in the deposition chamber that produces a deposition spray, the deposition source containing a composite material made of amorphous metal that contains more than 11 elements, and a system that directs the deposition spray onto the structure.

Farmer, Joseph C. (Tracy, CA)

2011-12-13T23:59:59.000Z

82

Amorphous metal formulations and structured coatings for corrosion and wear resistance  

DOE Patents [OSTI]

A system for coating a surface comprising providing a source of amorphous metal that contains more than 11 elements and applying the amorphous metal that contains more than 11 elements to the surface by a spray. Also a coating comprising a composite material made of amorphous metal that contains more than 11 elements. An apparatus for producing a corrosion-resistant amorphous-metal coating on a structure comprises a deposition chamber, a deposition source in the deposition chamber that produces a deposition spray, the deposition source containing a composite material made of amorphous metal that contains more than 11 elements, and a system that directs the deposition spray onto the structure.

Farmer, Joseph C.

2014-07-15T23:59:59.000Z

83

(Electronic structure and reactivities of transition metal clusters)  

SciTech Connect (OSTI)

The following are reported: theoretical calculations (configuration interaction, relativistic effective core potentials, polyatomics, CASSCF); proposed theoretical studies (clusters of Cu, Ag, Au, Ni, Pt, Pd, Rh, Ir, Os, Ru; transition metal cluster ions; transition metal carbide clusters; bimetallic mixed transition metal clusters); reactivity studies on transition metal clusters (reactivity with H{sub 2}, C{sub 2}H{sub 4}, hydrocarbons; NO and CO chemisorption on surfaces). Computer facilities and codes to be used, are described. 192 refs, 13 figs.

Not Available

1992-01-01T23:59:59.000Z

84

Fabrication of microfluidics structures on different glasses by simplified imprinting technique  

Science Journals Connector (OSTI)

Imprinting technique is an efficient method for fabricating microstructures for microfluidics and lab-on-chip applications. However such technique is not commonly used for glass based microstructures fabrication. In this study, microstructures were transferred completely and successfully from a nickel alloy stamp to different glasses such as sodalime glass, Pyrex glass, SGBN glass and magneto optical glasses, using imprinting technique. Furthermore, the traditional vacuum hot press for imprinting was replaced with the conventional electric furnace which increases the cost efficiency and simplicity greatly. Using specific mold in the conventional furnace, the mass production of microstructured glass chips can be realized.

Qiuping Chen; Qiuling Chen; Gabriele Maccioni

2013-01-01T23:59:59.000Z

85

Electronic structure and magnetic susceptibility of the different structural modifications of Ti, Zr, and Hf metals  

Science Journals Connector (OSTI)

The electronic structure of the early transition metals Ti, Zr, and Hf has been investigated for the hexagonal (?), hcp (?), bcc (?), and fcc phases using the linear-muffin-tin-orbital method of band-structure calculation. The results of these investigations are discussed in the light of previous band-structure calculations and experimental data closely related to the electronic structure (low-temperature specific heat, superconductive properties and magnetic susceptibility). It is found from the theoretical calculations that the electronic density of states at the Fermi level increases in the phase sequence hexagonal (?)?hcp (?)?fcc?bcc (?) and this behavior is unambiguously reflected in all the experimental data as well. A separation of the magnetic susceptibility into its components is performed and from this, the temperature dependence of the Pauli susceptibility for Ti, Zr, and Hf is deduced.

I. Bakonyi, H. Ebert, and A. I. Liechtenstein

1993-09-15T23:59:59.000Z

86

Nano-web structures constructed with a cellulose acetate/lithium chloride/polyethylene oxide hybrid: Modeling, fabrication and characterization  

Science Journals Connector (OSTI)

Abstract Electrospun nano-web structures (ENWSs) were successfully fabricated from ionized binary solution of celluloseMn30/polyethylene oxideMn200 (CA/PEO of 0.51.5). Final concentration of polymers was 12% (w/v) in the solution, and lithium chloride was used as ionizing agent. Response surface methodology (RSM) was applied to the optimize fabrication of ENWSs. Results of multiple linear regression analysis revealed that the solution properties and \\{ENWSs\\} morphology were strongly influenced by CA/PEO. An increase in PEO amount increased the viscosity which is a function of molecular weight, and as a result raised the entanglement of polymeric solution but decreased the surface tension that all support nanofibers fabrication. The size of nanofibers decreased with reducing PEO and LiCl concentration. Increasing the content of LiCl promoted the electrical conductivity (EC) value; however, junction zones were formed. The overall optimum region was found to be at combined level of 1.5% CA/PEO and 0.49% (w/v) LiCl.

Atefeh Broumand; Zahra Emam-Djomeh; Faramarz Khodaiyan; Sasan Mirzakhanlouei; Driush Davoodi; Ali A. Moosavi-Movahedi

2015-01-01T23:59:59.000Z

87

Metal-insulator-semiconductor structures on p-type GaAs with low interface state density  

E-Print Network [OSTI]

Metal-insulator-semiconductor structures on p-type GaAs with low interface state density Zhi Chen properties of in situ deposited Si3N4 /Si/p-GaAs metal-insulator-semiconductor structures have been offered by a low gate leakage technology in GaAs, such as metal insulator structures, func- tional Ga

Chen, Zhi

88

Structural Signature of Plastic Deformation in Metallic Glasses H. L. Peng,1,2  

E-Print Network [OSTI]

Structural Signature of Plastic Deformation in Metallic Glasses H. L. Peng,1,2 M. Z. Li,2,* and W the degree of local fivefold symmetry (LFFS) as the structural indicator to predict plastic deformation of local structures and find that the plastic events prefer to be initiated in regions with a lower degree

Wang, Wei Hua

89

Fabrication of superconducting metal-oxide textiles by heating impregnated polymeric material in a weakly oxidizing atmosphere  

SciTech Connect (OSTI)

A process is described for producing crystalline fibers, textiles or shapes comprised of YBa[sub 2]Cu[sub 3]O[sub 7[minus]x] where x varies from about 0 to about 0.4, said process comprising: (a) impregnating a preformed organic polymeric material with three metal compounds to provide metal elements in said material in substantially the atomic ratio occurring in said YBa[sub 2]Cu[sub 3]O[sub 7[minus]x]; (b) heating said impregnated material in a weakly oxidizing atmosphere containing from about 0.05% to about 2% oxygen by volume to a temperature sufficiently high to at least partially pyrolize and oxidize said organic material and at least partially oxidize said metal compounds substantially without ignition of said organic material and without formation of a molten phase or reaching a decomposition temperature of said YBa[sub 2]Cu[sub 3]O[sub 7[minus]x]; and (c) cooling the resulting material in at least a moderately oxidizing atmosphere to room temperature so as to obtain said fibers, textiles or shapes.

Van den Sype, J.S.

1993-07-13T23:59:59.000Z

90

Metallic glass electronic structure peculiarities revealed by UHV STM/STS  

Science Journals Connector (OSTI)

We present the results of ultrahigh vacuum scanning tunneling microscopy/spectroscopy investigation of metallic glass surface. The topography and electronic structure of Ni63.5Nb36.5 have been studied. A great nu...

A. I. Oreshkin; N. S. Maslova; V. N. Mantsevich; S. I. Oreshkin

2011-09-01T23:59:59.000Z

91

Structure of apo acyl carrier protein and a proposal to engineer protein crystallization through metal ions  

Science Journals Connector (OSTI)

To demonstrate a new strategy for engineering crystal lattices through metal-mediated interactions, apo acyl carrier protein has been crystallized in the presence of zinc ions. The structure was solved with MAD phasing using zinc anomalous signals.

Qiu, X.

2004-08-26T23:59:59.000Z

92

Nonlinear Structure of the Diffusing Gas-Metal Interface in a Thermonuclear Plasma  

E-Print Network [OSTI]

This Letter describes the theoretical structure of the plasma diffusion layer that develops from an initially sharp gas-metal interface. The layer dynamics under isothermal and isobaric conditions is considered so that ...

Molvig, Kim

93

Optical and structural characterization of silicon microstructures fabricated by laser interference crystallization  

SciTech Connect (OSTI)

Uniform gratings of sharply defined polycrystalline silicon lines with micrometer-sized periods were created by laser interference crystallization of amorphous silicon. Atomic force microscopy (AFM) reveals that lines fabricated with high pulse energies (380 mJ/cm{sup 2}) contain large grains (dimensions up to 1.5 {micro}m), growing in a direction perpendicular to the lines. The authors assign this strong lateral growth to the melting of the material in the center of the lines combined with the presence of small grains, which act as nuclei, at the interfaces with the amorphous regions. Spatially resolved Raman spectroscopy shows that size effects dominate the Raman line shape at the edge of the line, confirming the AFM results, while stress increases towards the center of the line. The spectra measured in the middle of lines created with high energies show doping effects caused by the diffusion of boron atoms from the substrate upon exposure.

Toet, D.; Aichmayr, G.; Mulato, M.; Santos, P.V.; Spangenberg, A.; Bergmann, R.B.

1997-07-01T23:59:59.000Z

94

Formation of ordered gas-solid structures via solidification in metal-hydrogen systems  

SciTech Connect (OSTI)

This work contains theoretical discussions concerning the large amount of previously published experimental data related to gas eutectic transformations in metal-hydrogen systems. Theories of pore nucleation and growth in these gas-solid materials will be presented and related to observed morphologies and structures. This work is intended to be helpful to theorists that work with metal-hydrogen systems, and experimentalists engaged in manufacturing technology development of these ordered gas-solid structures.

Shapovalov, V.I. [State Metallurgical Academy of Ukraine (Ukraine); [Sandia National Labs., Albuquerque, NM (United States)

1998-12-31T23:59:59.000Z

95

Fabrication of nano-structural arrays by channeling pulsed atomic beams through pulsed-laser standing-waves under off-resonant condition  

E-Print Network [OSTI]

Fabrication of nano-structural arrays by channeling pulsed atomic beams through pulsed 1998 We show that it is feasible to produce one- and two-dimensional nano-structure arrays by passing the reduced dimensions are of the order of nanometers (10 9 m . In particular, nano

Zhu, Xiangdong

96

Liquid metal systems development: reactor vessel support structure evaluation  

SciTech Connect (OSTI)

Results of an evaluation of support structures for the reactor vessel are reported. The U ring, box ring, integral ring, tee ring and tangential beam supports were investigated. The U ring is the recommended vessel support structure configuration.

McEdwards, J.A.

1981-01-01T23:59:59.000Z

97

Utilization of Refractory Metals and Alloys in Fusion Reactor Structures  

Science Journals Connector (OSTI)

In design of fusion reactors, structural material selection is very crucial to improve reactors performance. Different types of materials have been proposed for use in fusion reactor structures. Among these mate...

Mustafa beyli; ?enay Yal?n

2006-12-01T23:59:59.000Z

98

Design, fabrication and testing of a 15-kW gas-fired liquid-metal evaporator  

SciTech Connect (OSTI)

This paper describes the development and testing of a compact heat- pipe heat exchanger that is designed to transfer thermal energy from hot combustion gases to the heater tubes of a 25-kW{sub e} Stirling engine. In this system, sodium evaporates from a surface that is heated by a stream of hot gases and the liquid metal then condenses on the heater tubes of a Stirling engine where energy is transferred to the engine`s helium working fluid. Recent tests on a prototype unit illustrated that a compact (8 cm {times} 13 cm {times} 16 cm) sodium evaporator can routinely transfer 15-kW{sub t} of energy at an operating vapor temperature of 760{degrees}C. Four of these prototype units will eventually be used to power a 25-kW{sub e} Stirling engine system. Design details and test results from the prototype unit are presented in this paper.

Adkins, D.R.; Rawlinson, K.S.

1992-07-01T23:59:59.000Z

99

Design, fabrication and testing of a 15-kW gas-fired liquid-metal evaporator  

SciTech Connect (OSTI)

This paper describes the development and testing of a compact heat- pipe heat exchanger that is designed to transfer thermal energy from hot combustion gases to the heater tubes of a 25-kW{sub e} Stirling engine. In this system, sodium evaporates from a surface that is heated by a stream of hot gases and the liquid metal then condenses on the heater tubes of a Stirling engine where energy is transferred to the engine's helium working fluid. Recent tests on a prototype unit illustrated that a compact (8 cm {times} 13 cm {times} 16 cm) sodium evaporator can routinely transfer 15-kW{sub t} of energy at an operating vapor temperature of 760{degrees}C. Four of these prototype units will eventually be used to power a 25-kW{sub e} Stirling engine system. Design details and test results from the prototype unit are presented in this paper.

Adkins, D.R.; Rawlinson, K.S.

1992-01-01T23:59:59.000Z

100

Bulk diffusion induced structural modifications of carbon-transition metal nanocomposite films  

SciTech Connect (OSTI)

The influence of transition metal (TM = V,Co,Cu) type on the bulk diffusion induced structural changes in carbon:TM nanocomposite films is investigated. The TMs have been incorporated into the carbon matrix via ion beam co-sputtering, and subsequently the films have been vacuum annealed in the temperature range of 300 - 700 deg. C. The structure of both the dispersed metal rich and the carbon matrix phases has been determined by a combination of elastic recoil detection analysis, x-ray diffraction, transmission electron microscopy, and Raman spectroscopy. The as-grown films consist of carbidic (V and Co) and metallic (Cu) nanoparticles dispersed in the carbon matrix. Thermal annealing induces surface segregation of Co and Cu starting at {>=} 500 deg. C, preceded by the carbide-metal transformation of Co-carbide nanoparticles at {approx} 300 deg. C. No considerable morphological changes occur in C:V films. In contrast to the surface diffusion dominated regime where all the metals enhance the six-fold ring clustering of C, in the bulk diffusion controlled regime only Co acts as a catalyst for the carbon graphitization. These results are consistent with the metal-induced crystallization mechanism in the C:Co films. The results are discussed on the basis of the metal-carbide phase stability, carbon solubility in metals or their carbides, and interface species.

Berndt, M.; Abrasonis, G.; Kovacs, Gy. J.; Krause, M.; Munnik, F.; Heller, R.; Kolitsch, A.; Moeller, W.

2011-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" from the National Library of EnergyBeta (NLEBeta).
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101

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

102

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

103

Structural Dimensions, Fabrication, Materials, and Operational History for Types I and II Waste Tanks  

SciTech Connect (OSTI)

Radioactive waste is confined in 48 underground storage tanks at the Savannah River Site. The waste will eventually be processed and transferred to other site facilities for stabilization. Based on waste removal and processing schedules, many of the tanks, including those with flaws and/or defects, will be required to be in service for another 15 to 20 years. Until the waste is removed from storage, transferred, and processed, the materials and structures of the tanks must maintain a confinement function by providing a leak-tight barrier to the environment and by maintaining acceptable structural stability during design basis event which include loading from both normal service and abnormal conditions.

Wiersma, B.J.

2000-08-16T23:59:59.000Z

104

High Pressure Phase Transformations in Heavy Rare Earth Metals and Connections to Actinide Crystal Structures  

SciTech Connect (OSTI)

High-pressure studies have been performed on heavy rare earth metals Terbium (Tb) to 155 GPa and Holmium (Ho) to 134 GPa in a diamond anvil cell at room temperature. The following crystal structure sequence was observed in both metals hcp {yields} Sm-type {yields} dhcp {yields} distorted fcc (hR-24) {yields} monoclinic (C2/m) with increasing pressure. The last transformation to a low symmetry monoclinic phase is accompanied by a volume collapse of 5 % for Tb at 51 GPa and a volume collapse of 3 % for Ho at 103 GPa. This volume collapse under high pressure is reminiscent of f-shell delocalization in light rare earth metal Cerium (Ce), Praseodymium (Pr), and heavy actinide metals Americium (Am) and Curium (Cm). The orthorhombic Pnma phase that has been reported in Am and Cm after f-shell delocalization is not observed in heavy rare earth metals under high pressures. (authors)

Vohra, Yogesh K.; Sangala, Bagvanth Reddy; Stemshorn, Andrew K. [Physics, University of Alabama at Birmingham (UAB), 310 Campbell Hall, 1300 University Boulevard, Birmingham, AL, 35294-1170 (United States); Hope, Kevin M. [Biology, Chemistry, and Mathematics, University of Montevallo, Harman Hall, Station 6480, Montevallo, AL, 35115 (United States)

2008-07-01T23:59:59.000Z

105

Dendritic metal nanostructures  

DOE Patents [OSTI]

Dendritic metal nanostructures made using a surfactant structure template, a metal salt, and electron donor species.

Shelnutt, John A. (Tijeras, NM); Song, Yujiang (Albuquerque, NM); Pereira, Eulalia F. (Vila Nova de Gaia, PT); Medforth, Craig J. (Winters, CA)

2010-08-31T23:59:59.000Z

106

Method for fabricating five-level microelectromechanical structures and microelectromechanical transmission formed  

DOE Patents [OSTI]

A process for forming complex microelectromechanical (MEM) devices having five layers or levels of polysilicon, including four structural polysilicon layers wherein mechanical elements can be formed, and an underlying polysilicon layer forming a voltage reference plane. A particular type of MEM device that can be formed with the five-level polysilicon process is a MEM transmission for controlling or interlocking mechanical power transfer between an electrostatic motor and a self-assembling structure (e.g. a hinged pop-up mirror for use with an incident laser beam). The MEM transmission is based on an incomplete gear train and a bridging set of gears that can be moved into place to complete the gear train to enable power transfer. The MEM transmission has particular applications as a safety component for surety, and for this purpose can incorporate a pin-in-maze discriminator responsive to a coded input signal.

Rodgers, M. Steven (Albuquerque, NM); Sniegowski, Jeffry J. (Edgewood, NM); Miller, Samuel L. (Albuquerque, NM); McWhorter, Paul J. (Albuquerque, NM)

2000-01-01T23:59:59.000Z

107

Compact UHV system for fabrication and in situ analysis of electron beam deposited structures using a focused low energy electron beam  

SciTech Connect (OSTI)

A compact UHV system was developed in order to fabricate and analyze micro- and nanostructures on surfaces in situ. The system includes a low energy electron gun which provides a minimum spot size of {approx}25 nm in a diameter using electrostatic lenses, a cylindrical mirror analyzer for Auger electron spectroscopy (AES) and electron energy loss spectroscopy (EELS), a low energy electron diffraction (LEED) optics, and a scintillation counter for scanning electron microscopy. Thus, we can analyze electronic states of specific microstructures on surfaces. In addition, we can fabricate microscopic structures artificially by means of scanning a focused electron beam. In this article, first we show the performance of the present analysis system. Next, we provide an example of the fabrication of iron microstructures by electron-induced deposition of iron pentacarbonyl [Fe(CO){sub 5}]. We successfully analyzed the amount and chemical states of deposited iron by AES in situ. We also investigated coverage dependence of electronic structure and surface periodic structure by EELS and LEED measurements, respectively. Thus, this system enables us to fabricate and analyze microscopic structures on surfaces in situ.

Kakefuda, Y.; Yamashita, Y.; Mukai, K.; Yoshinobu, J. [Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan)

2006-05-15T23:59:59.000Z

108

Method for rapid fabrication of fiber preforms and structural composite materials  

DOE Patents [OSTI]

A densified carbon matrix carbon fiber composite preform is made by vacuum molding an aqueous slurry of carbon fibers and carbonizable organic powder to form a molded part. The molded part is dried in an oven at 50 C for 14 hours and hot pressed at 2000 psi at 400 C for 3 hours. The hot pressed part is carbonized at 650 C under nitrogen for 3 hours and graphitized at 2400 C to form a graphitic structure in the matrix of the densified carbon matrix carbon fiber composite preform. The densified preform has a density greater than 1.1 g/cc. 12 figs.

Klett, J.W.; Burchell, T.D.; Bailey, J.L.

1999-02-16T23:59:59.000Z

109

Method for rapid fabrication of fiber preforms and structural composite materials  

DOE Patents [OSTI]

A densified carbon matrix carbon fiber composite preform is made by vacuum molding an aqueous slurry of carbon fibers and carbonizable organic powder to form a molded part. The molded part is dried in an oven at 50 C for 14 hours and hot pressed at 2,000 psi at 400 C for 3 hours. The hot pressed part is carbonized at 650 C under nitrogen for 3 hours and graphitized at 2,400 C to form a graphitic structure in the matrix of the densified carbon matrix carbon fiber composite preform. The densified preform has a density greater than 1.1 g/cc. 12 figs.

Klett, J.W.; Burchell, T.D.; Bailey, J.L.

1998-04-28T23:59:59.000Z

110

Method for rapid fabrication of fiber preforms and structural composite materials  

DOE Patents [OSTI]

A densified carbon matrix carbon fiber composite preform is made by vacuum molding an aqueous slurry of carbon fibers and carbonizable organic powder to form a molded part. The molded part is dried in an oven at 50.degree. C. for 14 hours and hot pressed at 2000 psi at 400.degree. C. for 3 hours. The hot pressed part is carbonized at 650.degree. C. under nitrogen for 3 hours and graphitized at 2400.degree. C. to form a graphitic structure in the matrix of the densified carbon matrix carbon fiber composite preform. The densified preform has a density greater than 1.1 g/cc.

Klett, James W. (Knoxville, TN); Burchell, Timothy D. (Oak Ridge, TN); Bailey, Jeffrey L. (Clinton, TN)

1998-01-01T23:59:59.000Z

111

Method for rapid fabrication of fiber preforms and structural composite materials  

DOE Patents [OSTI]

A densified carbon matrix carbon fiber composite preform is made by vacuum molding an aqueous slurry of carbon fibers and carbonizable organic powder to form a molded part. The molded part is dried in an oven at 50.degree. C. for 14 hours and hot pressed at 2000 psi at 400.degree. C. for 3 hours. The hot pressed part is carbonized at 650.degree. C. under nitrogen for 3 hours and graphite at 2400.degree. C. to form a graphitic structure in the matrix of the densified carbon matrix carbon fiber composite preform. The densified preform has a density greater than 1.1 g/cc.

Klett, James W. (Knoxville, TN); Burchell, Timothy D. (Oak Ridge, TN); Bailey, Jeffrey L. (Clinton, TN)

1999-01-01T23:59:59.000Z

112

Research on micro-electric resistance slip welding of copper electrode during the fabrication of 3D metal micro-mold  

Science Journals Connector (OSTI)

Abstract 3D micro-mold fabricated by the micro double-staged laminated object manufacturing process (micro-DLOM) is formed via stacking and fitting of multi-layer 2D micro-structures. The connection of 2D micro-structures is related to forming accuracy and mechanical properties of 3D micro-mold. In this research, micro-electric resistance slip welding of copper electrodes was proposed to connect multi-layer 2D micro-structures. Firstly, the proper process parameters of slip welding were obtained through the welding experiment, and the temperature field of micro-electric resistance slip welding under such process parameters was simulated. Secondly, deposition effect of the copper bar electrode produced during slip welding was studied and the study results show that the copper element deposited in the slip welding area decreases as the surface roughness of copper electrode decreases. Finally, based on the above research, a square micro-cavity mold with micro-channel, a circular micro-cavity mold with cross keyway and micro gear cavity mold with two-stage steps were welded by the micro-electric resistance slip welding.

Bin Xu; Xiao-yu Wu; Jian-guo Lei; Feng Luo; Feng Gong; Chen-lin Du; Xiu-quan Sun; Shuang-chen Ruan

2013-01-01T23:59:59.000Z

113

Ab initio Electronic Structure Calculations of Metal-Vacuum-Metal Junctions in Nonequilibrium Situations  

Science Journals Connector (OSTI)

Electronic structures of bielectrode junctions under external bias voltages were recently solved numerically on an ab initio basis using nonequilibrium Green-function methods in combination with the density-funct...

Karel Carva; Ilja Turek

2004-12-01T23:59:59.000Z

114

Anomalous Doppler effect observed during propagation of magnetostatic waves in ferromagnetic films and ferrite-dielectric-metal structures  

Science Journals Connector (OSTI)

The anomalous Doppler effect observed during propagation of magnetostatic backward volume ... ferrite-dielectric-metal structure is investigated. The effect is theoretically substantiated, and plots of Doppler fr...

Yu. A. Ignatov; A. A. Klimov; S. A. Nikitov

2010-04-01T23:59:59.000Z

115

Nanoscale structural evolution of electrically driven insulator to metal transition in vanadium dioxide  

SciTech Connect (OSTI)

The structural evolution of tensile strained vanadium dioxide thin films was examined across the electrically driven insulator-to-metal transition by nanoscale hard X-ray diffraction. A metallic filament with rutile (R) structure was found to be the dominant conduction pathway for an electrically driven transition, while the majority of the channel area remained in the monoclinic M1 phase. The filament dimensions were estimated using simultaneous electrical probing and nanoscale X-ray diffraction. Analysis revealed that the width of the conducting channel can be tuned externally using resistive loads in series, enabling the M1/R phase ratio in the phase coexistence regime to be tuned.

Freeman, Eugene, E-mail: exf181@psu.edu; Shukla, Nikhil; Datta, Suman [Department of Electrical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)] [Department of Electrical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802 (United States); Stone, Greg; Engel-Herbert, Roman; Gopalan, Venkatraman [Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)] [Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802 (United States); Paik, Hanjong [Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853 (United States)] [Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853 (United States); Moyer, Jarrett A. [Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)] [Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States); Cai, Zhonghou; Wen, Haidan [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)] [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Schlom, Darrell G. [Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853 (United States) [Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853 (United States); Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853 (United States)

2013-12-23T23:59:59.000Z

116

The structures of the CutA1 proteins from Thermus thermophilus and Pyrococcus horikoshii: characterization of metal-binding sites and metal-induced assembly  

Science Journals Connector (OSTI)

The crystal structures of CutA1 from T. thermophilus HB8 with and without bound Na+ and CutA1 from P. horikoshii OT3 in complex with Na+ have been determined in order to understand metal binding and metal-driven assembly features of the proteins.

Bagautdinov, B.

2014-03-25T23:59:59.000Z

117

Electronic structure of metallic antiperovskite compound GaCMn3  

Science Journals Connector (OSTI)

We have investigated the electronic structures of antiperovskite GaCMn3 and related Mn compounds SnCMn3, ZnCMn3, and ZnNMn3. In the paramagnetic state of GaCMn3, the Fermi surface nesting feature along the ?R direction is observed, which induces the antiferromagnetic (AFM) spin ordering with the nesting vector Q??R. Calculated susceptibilities confirm the nesting scenario for GaCMn3, and also explain various magnetic structures of other antiperovskite compounds. Through the band folding effect, the AFM phase of GaCMn3 is stabilized. Nearly equal densities of states at the Fermi level in the ferromagnetic and AFM phases of GaCMn3 indicate that two phases are competing in the ground state.

J. H. Shim; S. K. Kwon; B. I. Min

2002-07-10T23:59:59.000Z

118

Electronic structure of a ferromagnetic-metalinsulator superlattice  

Science Journals Connector (OSTI)

Electronic structure calculations on superlattices of iron on one side and alloys of Ge, GaAs, and ZnSe on the other side are reported. A very large spin polarization of conduction electrons is found, which is of opposite sign compared to the spin polarization of conduction electrons in bulk iron. The occurrence of almost 100% spin polarization is dependent on the thickness and composition of the insulator layer and on the thickness of the iron layer.

E. de Jonge; P. K. de Boer; R. A. de Groot

1999-08-15T23:59:59.000Z

119

Structures and Reactivity of Transition-Metal Compounds Featuring Metal-Ligand Multiple Bonds  

E-Print Network [OSTI]

isomers of product 2a-f. .................................................................. 89 Figure 34. The rearrangement between 2_iso6 and 2_iso3. ............................................. 92 Figure 35. The solvated ?G (kcal/mol) diagram... iso3 and iso6 for 2a-f (kcal/mol). ................ 91 Table 17. Results of energies differencesa between 2c_iso6 and 2c_iso3. ...................... 92 xv Table 18. Selected structural parameters of 2a from computations and experiments. (Bond...

Xu, Zhenggang

2014-07-25T23:59:59.000Z

120

Total energy and band structure of the 3d, 4d, and 5d metals  

Science Journals Connector (OSTI)

We performed total-energy calculations by the scalar-relativistic augmented-plane-wave method in the local-density and muffin-tin approximations for all 3d, 4d, and 5d transition metals in the fcc and bcc structures. These calculations predict the correct equilibrium structure and give good agreement with experiment and other calculations for lattice constants and bulk moduli.

M. Sigalas; D. A. Papaconstantopoulos; N. C. Bacalis

1992-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" 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

Mercury and Other Heavy Metals Influence Bacterial Community Structure in Contaminated Streams  

E-Print Network [OSTI]

Mercury and Other Heavy Metals Influence Bacterial Community Structure in Contaminated Streams Research The influences of uranium (U), mercury (Hg) and methylmercury (MeHg) on the microbial community. #12;High concentrations of uranium, inorganic mercury, Hg(II) and methymercury (MeHg) have been

122

Computational studies of experimentally observed structures of sulfur on metal surfaces  

SciTech Connect (OSTI)

First-principles electronic structure calculations were carried out to examine the experimentally observed structures of sulfur on close packed surfaces of a number of important metals - Ag(111), Cu(111), Ni(111), Pt(111), Rh(111), Re(0001) and Ru(0001). At low coverages ({le} 1/3 ML), the prediction is consistent with the typical pattern of preferred sulfur occupancy of threefold hollow sites, notably the fcc site on the (111) surfaces and the hcp site on the (0001) surfaces. Theoretical confirmation for the existence of pure sulfur overlayer phases on Pt(111), Rh(111), Re(0001) and Ru(0001) at higher coverages (> 1/3 ML) was provided. For the ({radical}7 x {radical}7) phase seen on Ag(111), the most preferred structure identified for adsorbed S trimer consists of an S atom on the top site bonded to two S atoms situated on the nearest neighbor off-bridge site positions. Among the different densely packed mixed sulfur-metal overlayer models suggested for the ({radical}7 x {radical}7) phase on Cu(111), the structure which consists of metal and S atoms in a hexagonal-like arrangement on the top substrate was found to be the most energetically favorable. For the (5{radical}3 x 2) phase on Ni(111), the calculations confirm the existence of clock-reconstructed top layer metal atoms onto which sulfur atoms are adsorbed.

Alfonso, Dominic

2011-09-01T23:59:59.000Z

123

Metallic State in a Lime?Alumina Compound with Nanoporous Structure  

Science Journals Connector (OSTI)

Metallic State in a Lime?Alumina Compound with Nanoporous Structure ... Six Ca ions (green spheres) form a part of the cage wall and two Ca ions coordinate to a free oxygen ion or to an empty cage center. ... Mineral., Monatsh. ...

Sung Wng Kim; Satoru Matsuishi; Takatoshi Nomura; Yoshiki Kubota; Masaki Takata; Katsuro Hayashi; Toshio Kamiya; Masahiro Hirano; Hideo Hosono

2007-03-22T23:59:59.000Z

124

Many-Body Electronic Structure of Americium Metal Sergej Y. Savrasov,1  

E-Print Network [OSTI]

Many-Body Electronic Structure of Americium Metal Sergej Y. Savrasov,1 Kristjan Haule,2 and Gabriel, and electron-phonon interaction of americium using a novel spectral density functional method. This approach detectors, Americium is the first transuranic actinide where 5f6 electrons become localized and form

Savrasov, Sergej Y.

125

Ab initio study of structural stability of small 3d late transition metal clusters: Interplay of magnetization and hybridization  

E-Print Network [OSTI]

Using first-principles density-functional-theorybased calculations, we analyze the structural stability of small clusters of 3d late transition metals. We consider the relative stability of the two structures: layer-like ...

Datta, Soumendu

126

Tuning the crystal structure and electronic states of Ag2Se: Structural transitions and metallization under pressure  

Science Journals Connector (OSTI)

We performed synchrotron x-ray diffraction and infrared (IR) experiments combined with evolutionary structure predictions and band structure calculations on Ag2Se to ?20 GPa. We present evidence for phase I (?-Ag2Se) as a potential three-dimensional topological insulator by its increase in optical band gap and the topologically nontrivial nature of its band structure. Higher pressures induce a triple-layer stacking pattern and significantly increase the crystallographic inequivalence of the two Ag sites, where P212121 phase I first reconstructs into a Pnma phase II, and then transforms into a topologically different Cmcm phase III. The radical changes in IR spectra and electronic band structures indicate the metallic nature of the high-pressure phases. Our results highlight the effects of pressure in tuning the crystal structure and electronic states of Ag2Se.

Zhao Zhao; Shibing Wang; Artem R. Oganov; Pengcheng Chen; Zhenxian Liu; Wendy L. Mao

2014-05-22T23:59:59.000Z

127

Beyond the Lone-Pair Model for Structurally Distorted Metal Oxides  

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

Beyond the Lone-Pair Model for Structurally Distorted Metal Oxides Print Beyond the Lone-Pair Model for Structurally Distorted Metal Oxides Print "Ferroelectricity," by analogy to ferromagnetism, is defined as the presence of spontaneous electrical polarization in a material, often arising from distortions in the material's crystal structure. In oxides of the metals lead and bismuth, such distortions were for many years attributed to the existence of "lone pair" electrons: pairs of chemically inert, nonbonding valence electrons in hybrid orbitals that leave noticeable voids in the crystal structure. At the ALS, researchers from the U.K., Ireland, and the U.S. have now obtained definitive experimental evidence that this lone-pair model must be revised. High-resolution x-ray photoemission spectroscopy (XPS) and soft x-ray emission spectroscopy (XES) have clarified the subtle electronic origins of the prototypical distortions in these crystal structures. The results have important implications for the tantalizing possibility of spintronic or superconducting devices combining ferroelectric and ferromagnetic properties.

128

Beyond the Lone-Pair Model for Structurally Distorted Metal Oxides  

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

Beyond the Lone-Pair Model for Structurally Distorted Metal Oxides Print Beyond the Lone-Pair Model for Structurally Distorted Metal Oxides Print "Ferroelectricity," by analogy to ferromagnetism, is defined as the presence of spontaneous electrical polarization in a material, often arising from distortions in the material's crystal structure. In oxides of the metals lead and bismuth, such distortions were for many years attributed to the existence of "lone pair" electrons: pairs of chemically inert, nonbonding valence electrons in hybrid orbitals that leave noticeable voids in the crystal structure. At the ALS, researchers from the U.K., Ireland, and the U.S. have now obtained definitive experimental evidence that this lone-pair model must be revised. High-resolution x-ray photoemission spectroscopy (XPS) and soft x-ray emission spectroscopy (XES) have clarified the subtle electronic origins of the prototypical distortions in these crystal structures. The results have important implications for the tantalizing possibility of spintronic or superconducting devices combining ferroelectric and ferromagnetic properties.

129

The problems of weld metal or heat affected zone toughness in offshore structural steels  

SciTech Connect (OSTI)

An extensive set of fracture toughness results for welded offshore structural steels, gathered from nine separate sponsoring companies, has been entered into a specially constructed database. With over eleven thousand Charpy results and over two thousand CTOD results available, it has been possible to analyze the occurrence of low toughness results with respect to variables such as thickness, PWHT, steel production route etc., even though the individual test programs were not specifically structured to do this. This paper concentrates on the toughness of the weld metal. The data demonstrates that the likelihood of a low toughness result from a CTOD test in weld metal at {minus}10 C is comparable with that from the HAZ region for welded offshore structural steels, and PWHT of the joint is beneficial in reducing the occurrence of low toughness values in the weld metal. It is therefore important that when the HAZ performance is assessed, either through weld procedure tests or plate prequalification procedures, adequate attention is also paid to the weld metal toughness.

Hancock, P.; Spurrier, J.; Chubb, J.P. [Cranfield Univ. (United Kingdom). School of Industrial and Manufacturing Science

1996-12-01T23:59:59.000Z

130

Electronic structure and conductivity of nanocomposite metal (Au,Ag,Cu,Mo)-containing amorphous carbon films  

SciTech Connect (OSTI)

In this work, we study the influence of the incorporation of different metals (Me = Au, Ag, Cu, Mo) on the electronic structure of amorphous carbon (a-C:Me) films. The films were produced at room temperature using a novel pulsed dual-cathode arc deposition technique. Compositional analysis was performed with secondary neutral mass spectroscopy whereas X-ray diffraction was used to identify the formation of metal nanoclusters in the carbon matrix. The metal content incorporated in the nanocomposite films induces a drastic increase in the conductivity, in parallel with a decrease in the band gap corrected from Urbach energy. The electronic structure as a function of the Me content has been monitored by x-ray absorption near edge structure (XANES) at the C K-edge. XANES showed that the C host matrix has a dominant graphitic character and that it is not affected significantly by the incorporation of metal impurities, except for the case of Mo, where the modifications in the lineshape spectra indicated the formation of a carbide phase. Subtle modifications of the spectral lineshape are discussed in terms of nanocomposite formation.

Endrino, Jose L.; Horwat, David; Gago, Raul; Andersson, Joakim; Liu, Y.S.; Guo, Jinghua; Anders, Andre

2008-05-14T23:59:59.000Z

131

Structure of multilayered Cr(Al)N/SiO{sub x} nanocomposite coatings fabricated by differential pumping co-sputtering  

SciTech Connect (OSTI)

A Cr(Al)N/38 vol. % SiO{sub x} hard coating was prepared on a (001) Si substrate at 250 C in a differential pumping co-sputtering system, which has two chambers for radio frequency (RF) sputtering and a substrate holder rotating on the chambers. The composite coating was grown by alternate sputter-depositions from CrAl and SiO{sub 2} targets with flows of N{sub 2}+Ar and Ar at RF powers of 200 and 75 W, respectively, on transition layers grown on the substrate. Analytical electron microscopy reveled that the Cr(Al)N/SiO{sub x} coating had a multilayered structure of Cr(Al)N crystal layers ?1.6 nm thick and two-dimensionally dispersed amorphous silicon oxide (a-SiO{sub x}) particles with sizes of ?1 nm or less. The a-SiO{sub x} particles were enclosed with the Cr(Al)N layers. The coating had a low indentation hardness of ?25 GPa at room temperature, due to a high oxide fraction of 38 vol. % and a low substrate rotational speed of 1 rpm. Faster rotation and lower oxide fraction would make a-SiO{sub x} particles smaller, resulting in the formation of Cr(Al)N crystal including the very fine a-SiO{sub x} particles with small number density. They would work as obstacles for the lattice deformation of the Cr(Al)N crystals. We have fabricated a superhard coating of Cr(Al)N/17 vol. % SiO{sub x} with a hardness of 46 GPa prepared at 12 rpm.

Kawasaki, Masahiro [JEOL USA Inc., 11 Dearborn Road, Peabody, Massachusetts 01960 (United States)] [JEOL USA Inc., 11 Dearborn Road, Peabody, Massachusetts 01960 (United States); Nose, Masateru [Faculty of Art and Design, University of Toyama, 180 Futagami-machi, Takaoka 933-8588 (Japan)] [Faculty of Art and Design, University of Toyama, 180 Futagami-machi, Takaoka 933-8588 (Japan); Onishi, Ichiro [JEOL Ltd. 3-1-2 Musashino, Akishima, Tokyo 196-8558 (Japan)] [JEOL Ltd. 3-1-2 Musashino, Akishima, Tokyo 196-8558 (Japan); Shiojiri, Makoto [Kyoto Institute of Technology, Kyoto 606-8585 (Japan)] [Kyoto Institute of Technology, Kyoto 606-8585 (Japan)

2013-11-11T23:59:59.000Z

132

High detection efficiency micro-structured solid-state neutron detector with extremely low leakage current fabricated with continuous p-n junction  

SciTech Connect (OSTI)

We report the continuous p-n junction formation in honeycomb structured Si diode by in situ boron deposition and diffusion process using low pressure chemical vapor deposition for solid-state thermal neutron detection applications. Optimized diffusion temperature of 800 Degree-Sign C was obtained by current density-voltage characteristics for fabricated p{sup +}-n diodes. A very low leakage current density of {approx}2 Multiplication-Sign 10{sup -8} A/cm{sup 2} at -1 V was measured for enriched boron filled honeycomb structured neutron detector with a continuous p{sup +}-n junction. The neutron detection efficiency for a Maxwellian spectrum incident on the face of the detector was measured under zero bias voltage to be {approx}26%. These results are very encouraging for fabrication of large area solid-state neutron detector that could be a viable alternative to {sup 3}He tube based technology.

Huang, Kuan-Chih; Lu, James J.-Q.; Bhat, Ishwara B. [Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States)] [Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States); Dahal, Rajendra [Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States) [Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States); Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States); Danon, Yaron [Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States)] [Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States)

2013-04-15T23:59:59.000Z

133

Synthesis and structural, magnetic, thermal, and transport properties of several transition metal oxides and aresnides  

SciTech Connect (OSTI)

Oxide compounds containing the transition metal vanadium (V) have attracted a lot of attention in the field of condensed matter physics owing to their exhibition of interesting properties including metal-insulator transitons, structural transitions, ferromagnetic and antiferromagnetic orderings, and heavy fermion behavior. Binary vanadium oxides V{sub n}O{sub 2n-1} where 2 {le} n {le} 9 have triclinic structures and exhibit metal-insulator and antiferromagnetic transitions. The only exception is V{sub 7}O{sub 13} which remains metallic down to 4 K. The ternary vanadium oxide LiV{sub 2}O{sub 4} has the normal spinel structure, is metallic, does not undergo magnetic ordering and exhibits heavy fermion behavior below 10 K. CaV{sub 2}O{sub 4} has an orthorhombic structure with the vanadium spins forming zigzag chains and has been suggested to be a model system to study the gapless chiral phase. These provide great motivation for further investigation of some known vanadium compounds as well as to explore new vanadium compounds in search of new physics. This thesis consists, in part, of experimental studies involving sample preparation and magnetic, transport, thermal, and x-ray measurements on some strongly correlated eletron systems containing the transition metal vanadium. The compounds studied are LiV{sub 2}O{sub 4}, YV{sub 4}O{sub 8}, and YbV{sub 4}O{sub 8}. The recent discovery of superconductivity in RFeAsO{sub 1-x}F{sub x} (R = La, Ce, Pr, Gd, Tb, Dy, Sm, and Nd), and AFe{sub 2}As{sub 2} (A = Ba, Sr, Ca, and Eu) doped with K, Na, or Cs at the A site with relatively high T{sub c} has sparked tremendous activities in the condensed matter physics community and a renewed interest in the area of superconductivity as occurred following the discovery of the layered cuprate high T{sub c} superconductors in 1986. To discover more superconductors with hopefully higher T{sub c}'s, it is extremely important to investigate compounds having crystal structures related to the compounds showing high T{sub c} superconductivity. Along with the vanadium oxide compounds described before, this thesis describes our investigations of magnetic, structural, thermal and transport properties of EuPd{sub 2}Sb{sub 2} single crystals which have a crystal structure closely related to the AFe{sub 2}As{sub 2} compounds and also a study of the reaction kinetics of the formation of LaFeAsO{sub 1-x}F{sub x}.

Das, Supriyo

2010-05-16T23:59:59.000Z

134

Fabrication and characterization of the source grating for visibility improvement of neutron phase imaging with gratings  

SciTech Connect (OSTI)

The fabrication of gratings including metal deposition processes for highly neutron absorbing lines is a critical issue to achieve a good visibility of the grating-based phase imaging system. The source grating for a neutron Talbot-Lau interferometer is an array of Gadolinium (Gd) structures that are generally made by sputtering, photo-lithography, and chemical wet etching. However, it is very challenging to fabricate a Gd structure with sufficient neutron attenuation of approximately more than 20 {mu}m using a conventional metal deposition method because of the slow Gd deposition rate, film stress, high material cost, and so on. In this article, we fabricated the source gratings for neutron Talbot-Lau interferometers by filling the silicon structure with Gadox particles. The new fabrication method allowed us a very stable and efficient way to achieve a much higher Gadox filled structure than a Gd film structure, and is even more suitable for thermal polychromatic neutrons, which are more difficult to stop than cold neutrons. The newly fabricated source gratings were tested at the polychromatic thermal neutron grating interferometer system of HANARO at the Korea Atomic Energy Research Institute, and the visibilities and images from the neutron phase imaging system with the new source gratings were compared with those fabricated by a Gd deposition method.

Kim, Jongyul [Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea, Republic of); Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of); Lee, Kye Hong; Lim, Chang Hwy; Kim, Taejoo [Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea, Republic of); Ahn, Chi Won [Nano Fusion Technology Division, National Nanofab Center, Daejeon 305-701 (Korea, Republic of); Cho, Gyuseong [Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of); Lee, Seung Wook [School of Mechanical Engineering, Pusan National University, Pusan 609-735 (Korea, Republic of)

2013-06-15T23:59:59.000Z

135

Full-potential calculations using the generalized gradient approximation: Structural properties of transition metals  

Science Journals Connector (OSTI)

The equilibrium volumes and bulk moduli of nonmagnetic 3d, 4d, and 5d transition metals have been calculated using a full-potential linear-muffin-tin-orbitals (FP-LMTO) method and the generalized gradient approximation (PW91) of Perdew and Wang [in Electronic Structure of Solids 1991, edited by P. Ziesche and H. Eschrig (Akademie Verlag, Berlin, 1991), Vol. 11]. The gradient-corrected FP-LMTO results are found to be superior to the corresponding local-density approximation (LDA) results in all transition-metal series. Furthermore, the atomic-spheres approximation (ASA) is found to yield larger equilibrium volumes and smaller bulk moduli than the FP method. The inaccuracies introduced by the ASA are of the same magnitude as the gradient corrections, suggesting that a FP treatment is important for gradient-corrected calculations. Excellent agreement with experiment is found for the c/a ratios of the hcp metals using both the LDA and the PW91, while for the fcc-bcc structural energy differences of 4d metals disagreement with semiempirical estimates remains.

V. Ozoli? and M. Krling

1993-12-15T23:59:59.000Z

136

Structure-property relationships in gas-phase protonated and metalated peptide ions  

E-Print Network [OSTI]

STRUCTURE-PROPERTY RELATIONSHIPS IN GAS-PHASE PROTONATED AND METALATED PEPTIDE IONS A Dissertation by JAMES GARRETT SLATON Submitted to the Office of Graduate Studies of Texas A&M University in partial... by JAMES GARRETT SLATON Submitted to the Office of Graduate Studies Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, David H. Russell Committee...

Slaton, James Garrett

2009-05-15T23:59:59.000Z

137

Electronic Structure of Transition Metal Clusters and Actinide Complexes and Their Reactivity  

SciTech Connect (OSTI)

Our research in this area since October 2007 has resulted in seven completed publications and more papers of the completed work are in progress. Our work during this period principally focused on actinide complexes with secondary emphasis on spectroscopic properties and electronic structure of metal complexes. As the publications are available online with all of the details of the results, tables and figures, we are providing here only a brief summary of major highlights, in each of the categories.

Balasubramanian, K

2008-10-06T23:59:59.000Z

138

Diverse and tunable electronic structures of single-layer metal phosphorus trichalcogenides for photocatalytic water splitting  

SciTech Connect (OSTI)

The family of bulk metal phosphorus trichalcogenides (APX{sub 3}, A = M{sup II}, M{sub 0.5}{sup I}M{sub 0.5}{sup III}; X = S, Se; M{sup I}, M{sup II}, and M{sup III} represent Group-I, Group-II, and Group-III metals, respectively) has attracted great attentions because such materials not only own magnetic and ferroelectric properties, but also exhibit excellent properties in hydrogen storage and lithium battery because of the layered structures. Many layered materials have been exfoliated into two-dimensional (2D) materials, and they show distinct electronic properties compared with their bulks. Here we present a systematical study of single-layer metal phosphorus trichalcogenides by density functional theory calculations. The results show that the single layer metal phosphorus trichalcogenides have very low formation energies, which indicates that the exfoliation of single layer APX{sub 3} should not be difficult. The family of single layer metal phosphorus trichalcogenides exhibits a large range of band gaps from 1.77 to 3.94 eV, and the electronic structures are greatly affected by the metal or the chalcogenide atoms. The calculated band edges of metal phosphorus trichalcogenides further reveal that single-layer ZnPSe{sub 3}, CdPSe{sub 3}, Ag{sub 0.5}Sc{sub 0.5}PSe{sub 3}, and Ag{sub 0.5}In{sub 0.5}PX{sub 3} (X = S and Se) have both suitable band gaps for visible-light driving and sufficient over-potentials for water splitting. More fascinatingly, single-layer Ag{sub 0.5}Sc{sub 0.5}PSe{sub 3} is a direct band gap semiconductor, and the calculated optical absorption further convinces that such materials own outstanding properties for light absorption. Such results demonstrate that the single layer metal phosphorus trichalcogenides own high stability, versatile electronic properties, and high optical absorption, thus such materials have great chances to be high efficient photocatalysts for water-splitting.

Liu, Jian [School of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan (China) [School of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan (China); Beijing Computational Science Research Center, Beijing 100084 (China); College of Electrical and Information Engineering, Hunan Institute of Engineering, Xiangtan 411105, Hunan (China); Li, Xi-Bo; Wang, Da; Liu, Li-Min, E-mail: ppeng@hnu.edu.cn, E-mail: limin.liu@csrc.ac.cn [Beijing Computational Science Research Center, Beijing 100084 (China)] [Beijing Computational Science Research Center, Beijing 100084 (China); Lau, Woon-Ming [Beijing Computational Science Research Center, Beijing 100084 (China) [Beijing Computational Science Research Center, Beijing 100084 (China); Chengdu Green Energy and Green Manufacturing Technology R and D Center, Chengdu, Sichuan 610207 (China); Peng, Ping, E-mail: ppeng@hnu.edu.cn, E-mail: limin.liu@csrc.ac.cn [School of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan (China)] [School of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan (China)

2014-02-07T23:59:59.000Z

139

Fabric composite heat pipe technology development  

SciTech Connect (OSTI)

Testing has been performed on a variety of fabric composite technology feasibility issues. These include an evaluation of the effective radiation heat transfer rate from a heated metallic surface covered by a ceramic fabric with the intent of determining the effective emissivity'' of the combination of materials, studies of the wicking properties of ceramic fabrics, and the construction of fabric composite heat pipes to test their working properties under both steady state and transient conditions. Results of these experiments shown that fabric composite combinations have greatly enhanced effective emissivities'' resulting from the increases surface area of the fabric, ceramic fabrics can work very well as the wick for heat pipes, ceramic fabric heat pipes have been demonstrated to operate under typical space conditions, and large mass reductions are possible by using fabric composite heat pipes for heat rejection radiator systems.

Klein, A.C.; Gulshan-Ara, Z.; Kiestler, W.; Snuggerud, R.; Marks, T.S. (Department of Nuclear Engineering, Oregon State University, Corvallis, Oregon 97331 (United States))

1993-01-10T23:59:59.000Z

140

Cryogenic Fabric  

Science Journals Connector (OSTI)

The distinct soil micromorphology is produced due to the effects of freezing and thawing processes and is termed as cryogenic fabric. Layers, lenses, and streaks of segregation ice are typical elements of the cryogenic

P. Pradeep Kumar

2014-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" 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

Fabric Facts.  

E-Print Network [OSTI]

's Sewing Book. Stanford, Conn: Coats and Clark's, Inc., 1976. Complete Sewing Guide. Pleasantville, NY: The Reader's Digest Association, Inc;, 1976. "Giving Conventional Fabrics a Run for the Money." Clothes Etc. New York: Prads, Inc., April 15, 1978...

Saunders, Becky

1980-01-01T23:59:59.000Z

142

Structure, adhesion, and stability of metal/oxide and oxide/oxide interfaces  

SciTech Connect (OSTI)

Studies of structural, electronic, and chemical properties of metal/oxide and oxide/oxide interfaces were performed on well-defined interfaces that created by depositing ultra-thin potassium and aluminum films and their oxides onto single crystal TiO[sub 2] and NiO surfaces. Work focused on determining the structure, growth mechanisms, and morphologies of metal and oxide films as they are deposited an single crystal oxide surfaces using RHEED and atomic force microscopy probing electronic structure, bonding and chemical interactions at the interfaces using x-ray and uv photoelectron spectroscopies (XPS, UPS) and Auger electron spectroscopy (AES), and understanding factors affecting stability and reactivity of the interface regions including the role of defects and impurities. Results indicate that kinetic effects have an important influence on interface structure and composition, and they also show that defects in the oxide substrate induce new electronic states at the interface which play a major role in cation-anion bonding and interface interactions. The results establish a link between electronic and chemical bonding properties and the interface structure and morphology, which is required to successfully manipulate the interfacial properties of advanced ceramic materials.

Lad, R.J.

1992-11-01T23:59:59.000Z

143

Structure of the Alkali-metal-atom-Strontium molecular ions: towards photoassociation and formation of cold molecular ions  

E-Print Network [OSTI]

Structure of the Alkali-metal-atom-Strontium molecular ions: towards photoassociation and formation polarizability, of molecular ions composed of one alkali-metal atom and a Strontium ion are determined and a Strontium ion are discussed, as well as the formation of stable molecular ions. PACS numbers: 31.15.AR,31

144

Surface structure determinations of crystalline ionic thin films grown on transition metal single crystal surfaces by low energy electron diffraction  

SciTech Connect (OSTI)

The surface structures of NaCl(100), LiF(100) and alpha-MgCl2(0001) adsorbed on various metal single crystals have been determined by low energy electron diffraction (LEED). Thin films of these salts were grown on metal substrates by exposing the heated metal surface to a molecular flux of salt emitted from a Knudsen cell. This method of investigating thin films of insulators (ionic salts) on a conducting substrate (metal) circumvents surface charging problems that plagued bulk studies, thereby allowing the use of electron-based techniques to characterize the surface.

Roberts, J.G.

2000-05-01T23:59:59.000Z

145

Structural Basis of the Metal Specificity for Nickel Regulatory Protein NikR  

SciTech Connect (OSTI)

In the presence of excess nickel, Escherichia coli NikR regulates cellular nickel uptake by suppressing the transcription of the nik operon, which encodes the nickel uptake transporter, NikABCDE. Previously published in vitro studies have shown that NikR is capable of binding a range of divalent transition metal ions in addition to Ni{sup 2+}, including Co{sup 2+}, Cu{sup 2+}, Zn{sup 2+}, and Cd{sup 2+}. To understand how the high-affinity nickel binding site of NikR is able to accommodate these other metal ions, and to improve our understanding of NikR's mechanism of binding to DNA, we have determined structures of the metal-binding domain (MBD) of NikR in the apo form and in complex with Cu{sup 2+} and Zn{sup 2+} ions and compared them with the previously published structures with Ni{sup 2+}. We observe that Cu{sup 2+} ions bind in a manner very similar to that of Ni{sup 2+}, with a square planar geometry but with longer bond lengths. Crystals grown in the presence of Zn{sup 2+} reveal a protein structure similar to that of apo MBD with a disordered {alpha}3 helix, but with two electron density peaks near the Ni{sup 2+} binding site corresponding to two Zn{sup 2+} ions. These structural findings along with biochemical data on NikR support a hypothesis that ordering of the {alpha}3 helix is important for repressor activation.

Phillips, C.M.; Schreiter, E.R.; Guo, Y.; Wang, S.C.; Zamble, D.B.; Drennan, C.L.

2009-05-21T23:59:59.000Z

146

Fabrication and Characterization of Nano-Sized Magnetic Structures and Their Flux-Pinning Effects on Superconducting Thin Films  

E-Print Network [OSTI]

Energy Dissipation due to Vortex Motion .................................. 7 Vortex Pinning in the Ferromagnet-Superconductor Hybrid (FSH) . 9 II FABRICATION OF EMBEDDED FERROMAGNET..., as the external magnetic field increases above the lower critical field and below an upper critical field ??2 (?), the magnetic flux partially penetrates the sample in the form of tubes, or vortices (Fig.4). This state is said to be a vortex state or mixed...

Lee, Han Gil

2011-02-22T23:59:59.000Z

147

Structure, adhesion, and stability of metal/oxide and oxide/oxide interfaces  

SciTech Connect (OSTI)

During the past six months, we have begun our studies of the fundamental properties of metal/oxide and oxide/oxide heterogeneous interfaces which are being prepared by epitaxial growth of ultra-thin-films on single crystal TiO{sub 2} and NiO surfaces. A new ultra-high vacuum film growth chamber was assembled and coupled to an existing surface analysis chamber; a sample transfer system, metal deposition sources, and a RHEED systems with microchannel plate detection were constructed and implemented. Atomic Force Microscopy was used to characterize and refine the preparation procedures for the single crystal surfaces. The electronic structure of stoichiometric, oxygen-deficient, and potassium-covered TiO{sub 2} (110) surfaces was investigated. Preliminary results on the Al/TiO{sub 2} (110) system have been obtained. Two graduate students have begun thesis research on the project. 6 figs.

Lad, R.J.

1991-01-01T23:59:59.000Z

148

The influence of internal pore pressure during roll forming of structurally porous metals  

SciTech Connect (OSTI)

Structurally porous metal sandwich panels consisting of dense face sheets and porous cores of controlled relative density can be manufactured by trapping inert gas during hot isostatic pressing and modifying its distribution via subsequent thermo-mechanical forming. At high pressures, the internal gas is expected to influence the forming response. This paper describes a model for the roll forming of a porous metal panel and its use to explore the effects of internal pore pressure upon rolling response. It is shown that for gas pressures below about half the yield strength of the fully dense matrix material, there is essentially no influence on the forming response. Only in the case of very high initial pore pressures or at relative densities approaching full theoretical does a noticeable effect arise. In this case, a limiting upper density is attainable which depends on the specific rolling conditions and geometry.

Elzey, D.M.; Wadley, H.N.G. [Univ. of Virginia, Charlottesville, VA (United States). Dept. of Materials Science and Engineering

1998-12-31T23:59:59.000Z

149

Image-based characterization of cement pore structure using Wood`s metal intrusion  

SciTech Connect (OSTI)

Mercury intrusion porosimetry is a widely used technique for characterization of the pore size distribution of cement-based materials. However, the technique has several limitations, among which are the ink bottle effect and a cylindrical pore geometry assumption that lead to inaccurate pore size distribution curves. By substituting Wood`s metal for mercury as the intruding liquid, scanning electron microscopy and imaging techniques can be applied to the sample after intrusion. The molten Wood`s metal solidifies within the pore structure of the sample, which allows it to be sectioned and observed in the scanning electron microscopy. From here, the sample can be analyzed both qualitatively, by observing the changes in the appearance of the sample as the intrusion process progresses, and quantitatively, by applying image analysis techniques. This study provides insight for better interpretation of mercury intrusion porosimetry results and the possibility for quantitative characterization of the spatial geometry of pores in cement-based materials.

Willis, K.L.; Abell, A.B.; Lange, D.A. [Univ. of Illinois, Urbana, IL (United States). Dept. of Civil Engineering] [Univ. of Illinois, Urbana, IL (United States). Dept. of Civil Engineering

1998-12-01T23:59:59.000Z

150

Fabrication of High-Speed Resonant Cavity Enhanced Schottky Photodiodes  

E-Print Network [OSTI]

Abstract We report the fabrication and testing of a GaAsbased high-speed resonant cavity enhanced (RCE) Schottky photodiode. The top-illuminated RCE detector is constructed by integrating a Schottky contact, a thin absorption region (InHXHVGaHXWPAs) and a distributed AlAsGaAs Bragg mirror. The Schottky contact metal serves as a high-reflectivity top mirror in the RCE detector structure. The devices were fabricated by using a microwave-compatible fabrication process. The resulting spectral photo response had a resonance around 895 nm, in good agreement with our simulations. The full-widthat-half-maximum (FWHM) was 15 nm, and the enhancement factor was in excess of 6. The photodiode had an experimental setup limited temporal response of 18 ps FWHM, corresponding to a 3-dB bandwidth of 20 GHz. Index TermsHigh-speed circuits/devices, photodetectors, photodiodes, resonant caity enhancement, Schottky diodes.

Ekmel zbay; M. Saiful Islam; Bora Onat; Student Member; Mutlu Gkkavas; Orhan Aytr; Gary Tuttle; Elias Towe; R. H. Henderson; M. Selim nl; Senior Member

151

RC structures strengthened by metal shear panels: experimental and numerical analysis  

SciTech Connect (OSTI)

Metal shear panels (MSPs) may be effectively used as a lateral load resisting system for framed structures. In the present paper, such a technique is applied for the seismic protection of existing RC buildings, by setting up a specific design procedure, which has been developed on the basis of preliminary full-scale experimental tests. The obtained results allowed the development of both simplified and advanced numerical models of both the upgraded structure and the applied shear panels. Also, the proposed design methodology, which is framed in the performance base design philosophy, has been implemented for the structural upgrading of a real Greek existing multi-storey RC building. The results of the numerical analysis confirmed the effectiveness of the proposed technique, also emphasising the efficiency of the implemented design methodology.

De Matteis, G. [Dept. of Design, Rehabilitation and Control of Architectural Structures, University of Chieti-Pescara 'G. D'Annunzio', V.le Pindaro, 42-65127 Pescara (Italy); Formisano, A.; Mazzolani, F. M. [Dept. of Structural Engineering University of Naples 'Federico II', P.le Tecchio, 80-80125 Naples (Italy)

2008-07-08T23:59:59.000Z

152

Nuclear reactor fuel structure containing uranium alloy wires embedded in a metallic matrix plate  

SciTech Connect (OSTI)

A nuclear fuel-containing plate structure for a nuclear reactor is described; such structure comprising a pair of malleable metallic non-fissionable matrix plates having confronting surfaces which are pressure bonded together and fully united to form a bonded surface, and elongated malleable wire-like fissionable fuel members separately confined and fully enclosed between the matrix plates along the interface to afford a high fuel density as well as structural integrity and effective retention of fission products. The plates have separate recesses formed in the confronting surfaces for closely receiving the wire-like fissionable fuel members. The wire-like fissionable fuel members are made of a maleable uranium alloy capable of being formed into elongated wire-like members and capable of withstanding pressure bonding. The wire-like fissionable fuel members are completely separated and isolated by fully united portions of the interface.

Travelli, A.

1988-01-19T23:59:59.000Z

153

Lithographic fabrication of nanoapertures  

DOE Patents [OSTI]

A new class of silicon-based lithographically defined nanoapertures and processes for their fabrication using conventional silicon microprocessing technology have been invented. The new ability to create and control such structures should significantly extend our ability to design and implement chemically selective devices and processes.

Fleming, James G. (Albuquerque, NM)

2003-01-01T23:59:59.000Z

154

Liquid metal MHD studies with non-magnetic and ferro-magnetic structural material  

Science Journals Connector (OSTI)

Abstract In most of the liquid metal MHD experiments reported in the literature to study liquid breeder blanket performance, SS316/SS304 grade steels are used as the structural material which is non-magnetic. On the other hand, the structural material for fusion blanket systems has been proposed to be ferritic martensitic grade steel (FMS) which is ferromagnetic in nature. In the recent experimental campaign, liquid metal MHD experiments have been carried out with two identical test sections: one made of SS316L (non-magnetic) and another with SS430 (ferromagnetic), to compare the effect of structural materials on MHD phenomena for various magnetic fields (up to 4T). The maximum Hartmann number and interaction number are 1047 and 300, respectively. Each test section consists of square channel (25mmנ25mm) cross-section with two U bends, with inlet and outlet at the middle portion of two horizontal legs, respectively. PbLi enters into the test section through a square duct and distributed into two parallel paths through a partition plate. In each parallel path, it travels ?0.28m length in plane perpendicular to the magnetic field and faces two 90 bends before coming out of the test section through a single square duct. The wall electrical potential and MHD pressure drop across the test sections are compared under identical experimental conditions. Similar MHD behavior is observed with both the test section at higher value of the magnetic field (>2T).

A. Patel; R. Bhattacharyay; P.K. Swain; P. Satyamurthy; S. Sahu; E. Rajendrakumar; S. Ivanov; A. Shishko; E. Platacis; A. Ziks

2014-01-01T23:59:59.000Z

155

Investigation of contact acoustic nonlinearities on metal and composite airframe structures via intensity based health monitoring  

Science Journals Connector (OSTI)

Nonlinear structural intensity (NSI) and nonlinear structural surface intensity (NSSI) based damage detection techniques were improved and extended to metal and composite airframe structures. In this study the measurement of NSI maps at sub-harmonic frequencies was completed to provide enhanced understanding of the energy flow characteristics associated with the damage induced contact acoustic nonlinearity mechanism. Important results include NSI source localization visualization at ultra-subharmonic (nf/2) frequencies and damage detection results utilizing structural surface intensity in the nonlinear domain. A detection metric relying on modulated wave spectroscopy was developed and implemented using the NSSI feature. The data fusion of the intensity formulation provided a distinct advantage as both the single interrogation frequency NSSI and its modulated wave extension (NSSI-MW) exhibited considerably higher sensitivities to damage than using single-sensor (strain or acceleration) nonlinear detection metrics. The active intensity based techniques were also extended to composite materials and results show both NSSI and NSSI-MW can be used to detect damage in the bond line of an integrally stiffened composite plate structure with high sensitivity. Initial damage detection measurements made on an OH-58 tailboom (Penn State Applied Research Laboratory State College PA) indicate the techniques can be transitioned to complex airframe structures achieving high detection sensitivities with minimal sensors and actuators.

P. Q. Romano; S. C. Conlon; E. C. Smith

2013-01-01T23:59:59.000Z

156

Strain induced electronic structure changes in magnetic transition metal oxides thin films  

SciTech Connect (OSTI)

We show that the angular dependence of x-ray magnetic circular dichroism (XMCD) is strongly sensitive to strain-induced electronic structure changes in magnetic transition metal oxides. We observe a pronounced dependence of the XMCD spectral shape on the experimental geometry as well as nonvanishing XMCD with distinct spectral features in transverse geometry in compressively strained MnCr{sub 2}O{sub 4} films. The angular dependent XMCD can be described as a sum over an isotropic and anisotropic contribution, the latter linearly proportional to the axial distortion due to strain. The XMCD spectra are well reproduced by atomic multiplet calculations.

van der Laan, G.; Chopdekar, R.V.; Suzuki, Y.; Arenholz, E.

2010-07-08T23:59:59.000Z

157

Electronic structure of polycrystalline Cd metal using {sup 241}Am radioisotope  

SciTech Connect (OSTI)

Electronic structure study of the polycrystalline cadmium metal is reported. The experimental measurement is undertaken on a polycrystalline sheet sample using 59.54 keV radioisotope of {sup 241}Am. These results are compared with the ab initio calculations. The theoretical calculations are performed using linear combination of atomic orbitals (LCAO) method employing the density functional theories (DFT) and Hartree-Fock (HF) and augmented plane wave (APW) methods. The spherically averaged APW and LCAO based theoretical Compton profiles are in good agreement with the experimental measurement however the APW based theoretical calculations show best agreement.

Dhaka, M. S., E-mail: msdhaka75@yahoo.co.in [Department of Physics, University College of Science, M. L. S. University, Udaipur-313001 (India); Sharma, G. [Department of Pure and Applied Physics, University of Kota, Kota-324005 (India); Mishra, M. C. [Department of Physics, R. R. M. Government College, Jhunjhunu-333001 (India); Sharma, B. K. [Department of Physics, University of Rajasthan, Jaipur-302004 (India)

2014-04-24T23:59:59.000Z

158

Ultrafast x-ray diffraction for measurements of structural dynamics in shocked metals  

SciTech Connect (OSTI)

An experiment on structural dynamics at the ultrafast time scale in shocked metal samples is presented. The technique development of an ultrafast x-ray diffractometer to generate 'molecular movies' is described. Preliminary results of static x-ray measurements of thin unshocked Ga samples are presented. Initial experiments use 200-300 mJ of a 100fs Ti:Sapphire laser to excite K-alpha x-ray emission in an aluminum wire. The x-ray emission is relayed using a spherical crystal to the sample target. Plans for experiments using Cu K-alpha emission will also be described.

Workman, J. B. (Jonathan B.); Keiter, P. A. (Paul A.); Kyrala, George A.; Roberts, J. P. (Jeffrey); Taylor, Antoinette J.,; Funk, D. J. (David J.)

2002-01-01T23:59:59.000Z

159

Metal-insulator-semiconductor structure on low-temperature grown GaAs M. Young, W. Li, and T. P. Ma  

E-Print Network [OSTI]

Metal-insulator-semiconductor structure on low-temperature grown GaAs A. Chen,a M. Young, W. Li Received 28 July 2006; accepted 30 October 2006; published online 7 December 2006 The metal-insulator dielectrics and metal-insulator-semiconductor MIS structures; for ex- ample, in situ deposited Ga2O3 Gd2O3

Woodall, Jerry M.

160

Structure of Cu64.5Zr35.5 Metallic glass by reverse Monte Carlo simulations  

SciTech Connect (OSTI)

Reverse Monte Carlo simulations (RMC) have been widely used to generate three dimensional (3D) atomistic models for glass systems. To examine the reliability of the method for metallic glass, we use RMC to predict the atomic configurations of a known structure from molecular dynamics (MD) simulations, and then compare the structure obtained from the RMC with the target structure from MD. We show that when the structure factors and partial pair correlation functions from the MD simulations are used as inputs for RMC simulations, the 3D atomistic structure of the glass obtained from the RMC gives the short- and medium-range order in good agreement with those from the target structure by the MD simulation. These results suggest that 3D atomistic structure model of the metallic glass alloys can be reasonably well reproduced by RMC method with a proper choice of input constraints.

Fang, Xikui W. [Ames Laboratory; Huang, Li [Ames Laboratory; Wang, Cai-Zhuang [Ames Laboratory; Ho, Kai-Ming [Ames Laboratory; Ding, Z. J. [University of Science and Technology of China

2014-02-07T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" 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

Dirac cones in artificial structures of 3d transitional-metals doped Mg-Al spinels  

SciTech Connect (OSTI)

Motivated by recent theoretical predications for Dirac cone in two-dimensional (2D) triangular lattice [H. Ishizuka, Phys. Rev. Lett. 109, 237207 (2012)], first-principles studies are performed to predict Dirac cones in artificial structures of 3d transitional-metals (TM?=?Ti, V, Cr, Mn, Fe, Co, Ni, and Cu) doped Mg-Al spinels. In investigated artificial structures, TM dopants substitute specific positions of the B sub-lattice in Mg-Al spinel, and form a quasi-2D triangular lattice in the a-b plane. Calculated results illustrate the existence of the spin-polarized Dirac cones formed in d-wave bands at (around) the K-point in the momentum space. The study provides a promising route for engineering Dirac physics in condensed matters.

Lu, Yuan; Zuo, Xu, E-mail: xzuo@nankai.edu.cn [College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071 (China); Feng, Min [School of Physics, Nankai University, Tianjin 300071 (China); Shao, Bin [Department of Physics, Tsinghua University, Beijing 100084 (China)

2014-05-07T23:59:59.000Z

162

Nonlinear Structure of the Diffusing Gas-Metal Interface in a Thermonuclear Plasma  

Science Journals Connector (OSTI)

This Letter describes the theoretical structure of the plasma diffusion layer that develops from an initially sharp gas-metal interface. The layer dynamics under isothermal and isobaric conditions is considered so that only mass diffusion (mixing) processes can occur. The layer develops a distinctive structure with asymmetric and highly nonlinear features. On the gas side of the layer the diffusion coefficient goes nearly to zero, causing a sharp front, or well defined boundary between mix layer and clean gas with similarities to the Marshak thermal waves. Similarity solutions for the nonlinear profiles are found and verified with full ion kinetic code simulations. A criterion for plasma diffusion to significantly affect burn is given.

Kim Molvig; Erik L. Vold; Evan S. Dodd; Scott C. Wilks

2014-10-01T23:59:59.000Z

163

Large-Scale Electronic Structure Calculations of High-Z Metals on the BlueGene/L Platform  

E-Print Network [OSTI]

Large-Scale Electronic Structure Calculations of High-Z Metals on the BlueGene/L Platform Francois-accuracy electronic structure calculations needed to evaluate the energy of isolated defects. Such calculations cell. This in turn implies that a large number of valence electrons must be included in the calculation

Franchetti, Franz

164

Fabrication of Niobium sheet for RF cavities  

E-Print Network [OSTI]

..................................................................................... 18 2 Fabrication of Niobium SRF Cavities............................................. 20 3 Fine Grain Cavities versus Single Crystal and Large Grain........... Cavities... typical to that of RF cavities in comparison with Cu at 77 and 300K. Nb has low surface resistance in the operating range of 1GHz among the metals. [27]. 2. Fabrication of Niobium SRF Cavities There are different approaches involved in making...

Balachandran, Shreyas

2009-05-15T23:59:59.000Z

165

Method for large-scale fabrication of atomic-scale structures on material surfaces using surface vacancies  

DOE Patents [OSTI]

A method for forming atomic-scale structures on a surface of a substrate on a large-scale includes creating a predetermined amount of surface vacancies on the surface of the substrate by removing an amount of atoms on the surface of the material corresponding to the predetermined amount of the surface vacancies. Once the surface vacancies have been created, atoms of a desired structure material are deposited on the surface of the substrate to enable the surface vacancies and the atoms of the structure material to interact. The interaction causes the atoms of the structure material to form the atomic-scale structures.

Lim, Chong Wee (Urbana, IL); Ohmori, Kenji (Urbana, IL); Petrov, Ivan Georgiev (Champaign, IL); Greene, Joseph E. (Champaign, IL)

2004-07-13T23:59:59.000Z

166

E-Print Network 3.0 - aggregate structures metal Sample Search...  

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

J. Camobreco... 161:740-750 1996 ABSTRACT Soils accumulate heavy metals when sewage sludge is applied to land... -borne metals could represent if mobilized, many studies have...

167

Direct Observation of Decoupled Structural and Electronic Transitions and an Ambient Pressure Monocliniclike Metallic Phase of VO2  

Science Journals Connector (OSTI)

We report the simultaneous measurement of the structural and electronic components of the metal-insulator transition (MIT) of VO2 using electron and photoelectron spectroscopies and microscopies. We show that these evolve over different temperature scales, and are separated by an unusual monocliniclike metallic phase. Our results provide conclusive evidence that the new monocliniclike metallic phase, recently identified in high-pressure and nonequilibrium measurements, is accessible in the thermodynamic transition at ambient pressure, and we discuss the implications of these observations on the nature of the MIT in VO2.

J. Laverock; S. Kittiwatanakul; A.?A. Zakharov; Y.?R. Niu; B. Chen; S.?A. Wolf; J.?W. Lu; K.?E. Smith

2014-11-17T23:59:59.000Z

168

Fabrication Flaw Density and Distribution In Repairs to Reactor Pressure Vessel and Piping Welds  

SciTech Connect (OSTI)

The Pacific Northwest National Laboratory is developing a generalized fabrication flaw distribution for the population of nuclear reactor pressure vessels and for piping welds in U.S. operating reactors. The purpose of the generalized flaw distribution is to predict component-specific flaw densities. The estimates of fabrication flaws are intended for use in fracture mechanics structural integrity assessments. Structural integrity assessments, such as estimating the frequency of loss-of-coolant accidents, are performed by computer codes that require, as input, accurate estimates of flaw densities. Welds from four different reactor pressure vessels and a collection of archived pipes have been studied to develop empirical estimates of fabrication flaw densities. This report describes the fabrication flaw distribution and characterization in the repair weld metal of vessels and piping. This work indicates that large flaws occur in these repairs. These results show that repair flaws are complex in composition and sometimes include cracks on the ends of the repair cavities. Parametric analysis using an exponential fit is performed on the data. The relevance of construction records is established for describing fabrication processes and product forms. An analysis of these records shows there was a significant change in repair frequency over the years when these components were fabricated. A description of repair flaw morphology is provided with a discussion of fracture mechanics significance. Fabrication flaws in repairs are characterized using optimized-access, high-sensitivity nondestructive ultrasonic testing. Flaw characterizations are then validated by other nondestructive evaluation techniques and complemented by destructive testing.

GJ Schuster, FA Simonen, SR Doctor

2008-04-01T23:59:59.000Z

169

Fabrication Flaw Density and Distribution in Piping Weldments  

SciTech Connect (OSTI)

The U.S. Nuclear Regulatory Commission supported the Pacific Northwest National Laboratory (PNNL) to develop empirical data on the density and distribution of fabrication flaws in nuclear reactor components. These data are needed to support probabilistic fracture mechanics calculations and studies on component structural integrity. PNNL performed nondestructive examination inspections and destructive testing on archived piping welds to determine the fabrication flaw size and distribution characteristics of the flaws in nuclear power plant piping weldments. Eight different processes and product forms in piping weldments were studied including wrought stainless steel and dissimilar metal weldments. Parametric analysis using an exponential fit was performed on the data. Results were created as a function of the through-wall size of the fabrication flaws as well as the length distribution. The results are compared and contrasted with those developed for reactor pressure vessel processes and product forms. The most significant findings were that the density of fabrication flaws versus through-wall size was higher in piping weldments than that for the reactor pressure vessel weldments, and the density of fabrication flaws versus through-wall size in both reactor pressure vessel weld repairs and piping weldments were greater than the density in the original weldments. Curves showing these distributions are presented.

Doctor, Steven R.

2009-09-01T23:59:59.000Z

170

Hydrolysis of Naptalam and Structurally Related Amides: Inhibition by Dissolved Metal Ions and Metal (Hydr)Oxide Surfaces  

E-Print Network [OSTI]

. INTRODUCTION Several important classes of agrochemicals possess amide and anilide functional groups. Naptalam). Agrochemicals often possess functional groups in the vicinity of amide and anilide linkages; participation and anilide agrochemicals. Granados et al. (1995) reported no significant effects of dissolved divalent metal

Huang, Ching-Hua

171

Consistent LDA' + DMFT approach to the electronic structure of transition metal oxides: Charge transfer insulators and correlated metals  

SciTech Connect (OSTI)

We discuss the recently proposed LDA' + DMFT approach providing a consistent parameter-free treatment of the so-called double counting problem arising within the LDA + DMFT hybrid computational method for realistic strongly correlated materials. In this approach, the local exchange-correlation portion of the electron-electron interaction is excluded from self-consistent LDA calculations for strongly correlated electronic shells, e.g., d-states of transition metal compounds. Then, the corresponding double-counting term in the LDA' + DMFT Hamiltonian is consistently set in the local Hartree (fully localized limit, FLL) form of the Hubbard model interaction term. We present the results of extensive LDA' + DMFT calculations of densities of states, spectral densities, and optical conductivity for most typical representatives of two wide classes of strongly correlated systems in the paramagnetic phase: charge transfer insulators (MnO, CoO, and NiO) and strongly correlated metals (SrVO{sub 3} and Sr{sub 2}RuO{sub 4}). It is shown that for NiO and CoO systems, the LDA' + DMFT approach qualitatively improves the conventional LDA + DMFT results with the FLL type of double counting, where CoO and NiO were obtained to be metals. Our calculations also include transition-metal 4s-states located near the Fermi level, missed in previous LDA + DMFT studies of these monoxides. General agreement with optical and the X-ray experiments is obtained. For strongly correlated metals, the LDA' + DMFT results agree well with the earlier LDA + DMFT calculations and existing experiments. However, in general, LDA' + DMFT results give better quantitative agreement with experimental data for band gap sizes and oxygen-state positions compared to the conventional LDA + DMFT method.

Nekrasov, I. A., E-mail: nekrasov@iep.uran.ru; Pavlov, N. S.; Sadovskii, M. V. [Russian Academy of Sciences, Institute for Electrophysics, Ural Branch (Russian Federation)

2013-04-15T23:59:59.000Z

172

Mapping B1-induced eddy current effects near metallic structures in MR images: A comparison of simulation and experiment  

Science Journals Connector (OSTI)

Abstract Magnetic resonance imaging (MRI) in the presence of metallic structures is very common in medical and non-medical fields. Metallic structures cause MRI image distortions by three mechanisms: (1) static field distortion through magnetic susceptibility mismatch, (2) eddy currents induced by switched magnetic field gradients and (3) radio frequency (RF) induced eddy currents. Single point ramped imaging with T1 enhancement (SPRITE) MRI measurements are largely immune to susceptibility and gradient induced eddy current artifacts. As a result, one can isolate the effects of metal objects on the RF field. The RF field affects both the excitation and detection of the magnetic resonance (MR) signal. This is challenging with conventional MRI methods, which cannot readily separate the three effects. RF induced MRI artifacts were investigated experimentally at 2.4T by analyzing image distortions surrounding two geometrically identical metallic strips of aluminum and lead. The strips were immersed in agar gel doped with contrast agent and imaged employing the conical SPRITE sequence. B1 mapping with pure phase encode SPRITE was employed to measure the B1 field around the strips of metal. The strip geometry was chosen to mimic metal electrodes employed in electrochemistry studies. Simulations are employed to investigate the RF field induced eddy currents in the two metallic strips. The RF simulation results are in good agreement with experimental results. Experimental and simulation results show that the metal has a pronounced effect on the B1 distribution and B1 amplitude in the surrounding space. The electrical conductivity of the metal has a minimal effect.

S. Vashaee; F. Goora; M.M. Britton; B. Newling; B.J. Balcom

2015-01-01T23:59:59.000Z

173

Central Fabrication Services | Brookhaven National Laboratory  

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

Central Fabrication Services Central Fabrication Services Home Management Staff Facilities Heavy Machine Shop Welding Shop Sheet Metal Shop Central Cleaning Facility CR X-Ray Facility Inspection Area Services Fabrication Services Group is committed to providing exceptional service to all of its customers. Safety is an integral part of our program and is in the foundation of everything we do. Fabrication Services is a full service proto type shop with production capabilities. Our facilities include machining, wire EDM, water jet cutting, orbital welding, welding, sheet metal, precision measurement, 3D printing, maintenance metal working, cleaning for UHV applications, and our newest addition Computed Radiography. Our capabilities include working on ultra-miniature parts to 20 ton assemblies. Our capability and range of services we provide is largely due

174

Electronic structure of the 4d transition metal carbides: Dispersed fluorescence spectroscopy of MoC, RuC, and PdC  

E-Print Network [OSTI]

Electronic structure of the 4d transition metal carbides: Dispersed fluorescence spectroscopy of Mo transition metal carbides is also provided. © 2001 American Institute of Physics. DOI: 10.1063/1.1316042 I, and astrochemistry. Within the 4d se- ries, the diatomic transition metal carbides have aroused considerable interest

Morse, Michael D.

175

Fabrication and Test of a 3.7 m Long Support Structure for the LARP Nb3Sn Quadrupole Magnet LQS01  

SciTech Connect (OSTI)

The 3.7 m long quadrupole magnet LQS01 represents a major step of the US LHC Accelerator Research Program (LARP) towards the development of long Nb{sub 3}Sn accelerator quadrupole magnets for a LHC Luminosity upgrade. The magnet support structure is a scale up of the 1 m long Technology Quadrupole TQS design with some modifications suggested by TQS model test results. It includes an aluminum shell pre-tensioned over iron yokes using pressurized bladders and locking keys (bladder and key technology). The axial support is provided by two stainless steel end plates compressed against the coil ends by four stainless steel rods. The structure, instrumented with strain gauges, has been fabricated and assembled around four aluminum 'dummy coils' to determine pre-load homogeneity and mechanical characteristics during cool-down. After presenting the main magnetic and mechanical parameters of LQS01, we report in this paper on the design, assembly, and test of the support structure, with a comparison between strain gauges data and 3D finite element model results.

Ferracin, P.; Ambrosio, G.; Anerella, M.; Bingham, B.; Bossert, R.; Caspi, S.; Cheng, D.W.; Felice, H.; Hafalia, A. R.; Hannaford, C. R.; Nobrega, F.; Prestemon, S.; Sabbi, G. L.; Schmalzle, J.; Trillaud, F.; Wanderer, P.; Zlobin, A. V.

2008-08-17T23:59:59.000Z

176

Investigation of structural and electrical properties of flat a-Si/c-Si heterostructure fabricated by EBPVD technique  

SciTech Connect (OSTI)

Flat amorphous silicon - crystal silicon (a-Si/c-Si) heterostructure were prepared by ultra-high vacuum electron beam evaporation technique on p-Si (111) and n-Si (100) single crystal substrates. Structural analyses were investigated by XRD, Raman and FEG-SEM analysis. With these analyses we determined that at the least amorphous structure shows modification but amorphous structure just protected. The electrical and photovoltaic properties of flat a-Si/c-Si heterojunction devices were investigated with current-voltage characteristics under dark and illumination conditions. Electrical properties of flat a-Si/c-Si heterorojunction; such as barrier height ?{sub B}, diode ideality factor ? were determined from current-voltage characteristics in dark conditions. These a-Si/c-Si heterostructure have good rectification behavior as a diode and exhibit high photovoltaic sensitivity.

Demiro?lu, D. [Department of Metallurgical and Materials Engineering, Istanbul Technical University, Ayaza?a 34469, Istanbul (Turkey); Tatar, B. [Faculty of Arts and Sciences, Department of Physics, Nam?k Kemal University, De?irmenalt?, Tekirda? (Turkey); Kazmanli, K.; Urgen, M. [Department of Metallurgical and Materials Engineering, Istanbul Technical University, Ayaza?a 34469, Istanbul (Turkey)

2013-12-16T23:59:59.000Z

177

Electrical excitation of colloidally synthesized quantum dots in metal oxide structures  

E-Print Network [OSTI]

This thesis develops methods for integrating colloidally synthesized quantum dots (QDs) and metal oxides in optoelectronic devices, presents three distinct light emitting devices (LEDs) with metal oxides surrounding a QD ...

Wood, Vanessa Claire

2010-01-01T23:59:59.000Z

178

Pressure-induced changes in the electronic structure of americium metal  

SciTech Connect (OSTI)

We have conducted electronic-structure calculations for Am metal under pressure to investigate the behavior of the 5f-electron states. Density-functional theory (DFT) does not reproduce the experimental photoemission spectra for the ground-state phase where the 5f electrons are localized, but the theory is expected to be correct when 5f delocalization occurs under pressure. The DFT prediction is that peak structures of the 5f valence band will merge closer to the Fermi level during compression indicating presence of itinerant 5f electrons. Existence of such 5f bands is argued to be a prerequisite for the phase transitions, particularly to the primitive orthorhombic AmIV phase, but does not agree with modern dynamical-mean-field theory (DMFT) results. Our DFT model further suggests insignificant changes of the 5f valence under pressure in agreement with recent resonant x-ray emission spectroscopy, but in contradiction to the DMFT predictions. The influence of pressure on the 5f valency in the actinides is discussed and is shown to depend in a non-trivial fashion on 5f band position and occupation relative to the spd valence bands.

Soderlind, P; Moore, K T; Landa, A; Bradley, J A

2011-02-25T23:59:59.000Z

179

Microporous Metal-Organic Frameworks Incorporating 1,4-Benzeneditetrazolate: Syntheses, Structures, and  

E-Print Network [OSTI]

@berkeley.edu Abstract: The potential of tetrazolate-based ligands for forming metal-organic frameworks of utility

180

Effects of plastic constraint on the cyclic and static fatigue behavior of metal/ceramic layered structures  

E-Print Network [OSTI]

of studies have reported on the corresponding subcritical crack-growth properties, specifically involving of metal/ceramic layered structures is examined under cyclic and static loading conditions. Crack-growth loading, crack growth occurred primarily at the interface separating the two materials; additionally

Kruzic, Jamie

Note: This page contains sample records for the topic "fabricated structural metal" 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

Thermoelectric material including a multiple transition metal-doped type I clathrate crystal structure  

DOE Patents [OSTI]

A thermoelectric material includes a multiple transition metal-doped type I clathrate crystal structure having the formula A.sub.8TM.sub.y.sub.1.sup.1TM.sub.y.sub.2.sup.2 . . . TM.sub.y.sub.n.sup.nM.sub.zX.sub.46-y.sub.1.sub.-y.sub.2.sub.- . . . -y.sub.n.sub.-z. In the formula, A is selected from the group consisting of barium, strontium, and europium; X is selected from the group consisting of silicon, germanium, and tin; M is selected from the group consisting of aluminum, gallium, and indium; TM.sup.1, TM.sup.2, and TM.sup.n are independently selected from the group consisting of 3d, 4d, and 5d transition metals; and y.sub.1, y.sub.2, y.sub.n and Z are actual compositions of TM.sup.1, TM.sup.2, TM.sup.n, and M, respectively. The actual compositions are based upon nominal compositions derived from the following equation: z=8q.sub.A-|.DELTA.q.sub.1|y.sub.1-|.DELTA.q.sub.2|y.sub.2- . . . -|.DELTA.q.sub.n|y.sub.n, wherein q.sub.A is a charge state of A, and wherein .DELTA.q.sub.1, .DELTA.q.sub.2, .DELTA.q.sub.n are, respectively, the nominal charge state of the first, second, and n-th TM.

Yang, Jihui (Lakeshore, CA); Shi, Xun (Troy, MI); Bai, Shengqiang (Shanghai, CN); Zhang, Wenqing (Shanghai, CN); Chen, Lidong (Shanghai, CN); Yang, Jiong (Shanghai, CN)

2012-01-17T23:59:59.000Z

182

Photon-controlled fabrication of amorphous superlattice structures using ArF (193 nm) excimer laser photolysis  

SciTech Connect (OSTI)

Pulsed ArF (193 nm) excimer laser photolysis of disilane, germane, and disilane-ammonia mixtures has been used to deposit amorphous superlattices containing silicon, germanium, and silicon nitride layers. Transmission electron microscope cross-section views demonstrate that structures having thin (5--25 nm) layers and sharp interlayer boundaries can be deposited at substrate temperatures below the pyrolytic threshold, entirely under laser photolytic control.

Lowndes, D.H.; Geohegan, D.B.; Eres, D.; Pennycook, S.J.; Mashburn, D.N.; Jellison G.E. Jr.

1988-05-30T23:59:59.000Z

183

Electronic Structure of Transition Metal Clusters, Actinide Complexes and Their Reactivities  

SciTech Connect (OSTI)

This is a continuing DOE-BES funded project on transition metal and actinide containing species, aimed at the electronic structure and spectroscopy of transition metal and actinide containing species. While a long term connection of these species is to catalysis and environmental management of high-level nuclear wastes, the immediate relevance is directly to other DOE-BES funded experimental projects at DOE-National labs and universities. There are a number of ongoing gas-phase spectroscopic studies of these species at various places, and our computational work has been inspired by these experimental studies and we have also inspired other experimental and theoretical studies. Thus our studies have varied from spectroscopy of diatomic transition metal carbides to large complexes containing transition metals, and actinide complexes that are critical to the environment. In addition, we are continuing to make code enhancements and modernization of ALCHEMY II set of codes and its interface with relativistic configuration interaction (RCI). At present these codes can carry out multi-reference computations that included up to 60 million configurations and multiple states from each such CI expansion. ALCHEMY II codes have been modernized and converted to a variety of platforms such as Windows XP, and Linux. We have revamped the symbolic CI code to automate the MRSDCI technique so that the references are automatically chosen with a given cutoff from the CASSCF and thus we are doing accurate MRSDCI computations with 10,000 or larger reference space of configurations. The RCI code can also handle a large number of reference configurations, which include up to 10,000 reference configurations. Another major progress is in routinely including larger basis sets up to 5g functions in thee computations. Of course higher angular momenta functions can also be handled using Gaussian and other codes with other methods such as DFT, MP2, CCSD(T), etc. We have also calibrated our RECP methods with all-electron Douglas-Kroll relativistic methods. We have the capabilities for computing full CI extrapolations including spin-orbit effects and several one-electron properties and electron density maps including spin-orbit effects. We are continuously collaborating with several experimental groups around the country and at National Labs to carry out computational studies on the DOE-BES funded projects. The past work in the last 3 years was primarily motivated and driven by the concurrent or recent experimental studies on these systems. We were thus significantly benefited by coordinating our computational efforts with experimental studies. The interaction between theory and experiment has resulted in some unique and exciting opportunities. For example, for the very first time ever, the upper spin-orbit component of a heavy trimer such as Au{sub 3} was experimentally observed as a result of our accurate computational study on the upper electronic states of gold trimer. Likewise for the first time AuH{sub 2} could be observed and interpreted clearly due to our computed potential energy surfaces that revealed the existence of a large barrier to convert the isolated AuH{sub 2} back to Au and H{sub 2}. We have also worked on yet to be observed systems and have made predictions for future experiments. We have computed the spectroscopic and thermodynamic properties of transition metal carbides transition metal clusters and compared our electronic states to the anion photodetachment spectra of Lai Sheng Wang. Prof Mike Morse and coworkers(funded also by DOE-BES) and Prof Stimle and coworkers(also funded by DOE-BES) are working on the spectroscopic properties of transition metal carbides and nitrides. Our predictions on the excited states of transition metal clusters such as Hf{sub 3}, Nb{sub 2}{sup +} etc., have been confirmed experimentally by Prof. Lombardi and coworkers using resonance Raman spectroscopy. We have also been studying larger complexes critical to the environmental management of high-level nuclear wastes. In collaboration with experimental co

Krishnan Balasubramanian

2009-07-18T23:59:59.000Z

184

Structural and biophysical properties of metal-free pathogenic SOD1 mutants A4V and G93A  

SciTech Connect (OSTI)

Amyotrophic lateral sclerosis (ALS) is a fatal, progressive neurodegenerative disease characterized by the destruction of motor neurons in the spinal cord and brain. A subset of ALS cases are linked to dominant mutations in copper-zinc superoxide dismutase (SOD1). The pathogenic SOD1 variants A4V and G93A have been the foci of multiple studies aimed at understanding the molecular basis for SOD1-linked ALS. The A4V variant is responsible for the majority of familial ALS cases in North America, causing rapidly progressing paralysis once symptoms begin and the G93A SOD1 variant is overexpressed in often studied murine models of the disease. Here we report the three-dimensional structures of metal-free A4V and of metal-bound and metal-free G93A SOD1. In the metal-free structures, the metal-binding loop elements are observed to be severely disordered, suggesting that these variants may share mechanisms of aggregation proposed previously for other pathogenic SOD1 proteins.

Galaleldeen, Ahmad; Strange, Richard W.; Whitson, Lisa J.; Antonyuk, Svetlana V.; Narayana, Narendra; Taylor, Alexander B.; Schuermann, Jonathan P.; Holloway, Stephen P.; Hasnain, S.Samar; Hart, P. John; (Texas-HSC); (Liverpool)

2010-07-19T23:59:59.000Z

185

Subcell Structure and Two Different Superstructures of the Rare Earth Metal Silicide Carbides Y  

SciTech Connect (OSTI)

The title compounds crystallize with a very pronounced subcell structure that has been determined from single-crystal X-ray diffractometer data of all four compounds. Only subcell (and no superstructure) reflections have been observed for Pr{sub 3}Si{sub 2}C{sub 2}: space group Cmmm, a=396.7(1) pm, b=1645.2(3) pm, c=439.9(1) pm, R=0.019 for 309 structure factors and 20 variable parameters. In this subcell structure there are C{sub 2} pairs with split atomic positions. This structure may be considered the thermodynamically stable forms of these compounds at high temperatures. Two different superstructures with doubled a or c axes, respectively, of the subcell have been observed, where the C{sub 2} pairs have different orientations. In the structure of Tb{sub 3}Si{sub 2}C{sub 2} the a axis of the subcell is doubled. The resulting superstructure in the standard setting has the space group Pbcm: a=423.6(1) pm, b=770.7(1) pm, c=1570.2(3) pm, R=0.031 f or 1437 structure factors and 22 variable parameters. Dy{sub 3}Si{sub 2}C{sub 2} has the same superstructure: a=420.3(1) pm, b=767.5(1) pm, c=1561.1(3) pm, R=0.045, 801 F values, 22 variables. In the structure of Y{sub 3}Si{sub 2}C{sub 2} the c axis of the subcell is doubled, resulting in a body-centered space group with the standard setting Imma: a=842.6(2) pm, b=1563.4(2) pm, c=384.6(1) pm, R=0.035, 681 F values, 15 variables. In all of these structures the rare earth atoms form two-dimensionally infinite sheets of edge-sharing octahedra that contain the C{sub 2} pairs. In between these sheets there are zig-zag chains of silicon atoms with Si-Si distances varying between 246.2(3) and 253.6(3) pm, somewhat longer than the two-electron bonds of 235 pm in elemental silicon, suggesting a bond order of 0.5 for the Si-Si bonds. The C-C distances in the C{sub 2} pairs vary between 127(1) and 131(1) pm, corresponding to a bond order of approximately 2. 5. Hence, using oxidation numbers, the compounds may to a first approximation be represented by the formula (R{sup +3}){sub 3}(Si{sup {minus}3}){sub 2}(C{sub 2}){sup {minus}3}. A more detailed analysis of the interatomic distances showed that the shortest R-R distances are comparable with the R-R distances in the structures of the rare earth elements, thus indicating some R-R bonding. Therefore, the oxidation numbers of the rare earth atoms are slightly lower than +3, in agreement with the metallic conductivity of these compounds. As a consequence, considering the relatively short Si-Si bonds, the absolute value of the oxidation number of the silicon atoms may be lower than 3, resulting in a Si-Si bond order somewhat higher than 0.5.

Jeitschko, Wolfgang; Gerdes, Martin H.; Witte, Anne M.; Rodewald, Ute Ch.

2001-01-01T23:59:59.000Z

186

Divalent metal nanoparticles  

E-Print Network [OSTI]

Metal nanoparticles hold promise for many scientific and technological applications, such as chemical and biological sensors, vehicles for drug delivery, and subdiffraction limit waveguides. To fabricate such devices, a ...

DeVries, Gretchen Anne

2008-01-01T23:59:59.000Z

187

Structural and photovoltaic properties of a-Si (SNc)/c-Si heterojunction fabricated by EBPVD technique  

SciTech Connect (OSTI)

In last two decades sculptured thin films are very attractive for researches. Some properties of these thin films, like high porosity correspondingly high large surface area, controlled morphology; bring into prominence on them. Sculptured thin films have wide application areas as electronics, optics, mechanics, magnetic and chemistry. Slanted nano-columnar (SnC) thin films are a type of sculptured thin films. In this investigation SnC thin films were growth on n-type crystalline Si(100) and p-type crystalline Si(111) via ultra-high vacuum electron beam evaporation technique. The structural and morphological properties of the amorphous silicon thin films were investigated by XRD, Raman and FE-SEM analysis. According to the XRD and Raman analysis the structure of thin film was amorphous and FE-SEM analysis indicated slanted nano-columns were formed smoothly. Slanted nano-columns a-Si/c-Si heterojunction were prepared as using a photovoltaic device. In this regard we were researched photovoltaic properties of these heterojunction with current-voltage characterization under dark and illumination conditions. Electrical parameters were determined from the current-voltage characteristic in the dark conditions zero-bias barrier height ?{sub B0}?=?0.83?1.00eV; diode ideality factor ??=?11.71?10.73; series resistance R{sub s}?=?260?31.1 k? and shunt resistance R{sub sh}?=?25.71?63.5 M? SnC a-Si/n-Si and SnC a-Si/p-Si heterojunctions shows a pretty good photovoltaic behavior about 10{sup 3}- 10{sup 4} times. The obtained photovoltaic parameters are such as short circuit current density J{sub sc} 83-40 mA/m{sup 2}, open circuit voltage V{sub oc} 900-831 mV.

Demiro?lu, D.; Kazmanli, K.; Urgen, M. [Department of Metallurgical and Materials Engineering, Istanbul Technical University, Ayaza?a 34469, Istanbul (Turkey); Tatar, B. [Faculty of Arts and Sciences, Department of Physics, Nam?k Kemal University, De?irmenalt?, Tekirda? (Turkey)

2013-12-16T23:59:59.000Z

188

Fabrication of thin-wall hollow nickel spheres and low density syntactic foams  

SciTech Connect (OSTI)

A process has been developed to fabricate thin-wall hollow spheres from conventional oxide powders at room temperature. The polymer- bonded powder shells are fired in air to sinter the walls, leaving the shells either impervious or porous. Alternatively, the oxide shells can be preferentially reduced to produce thin-wall hollow metal spheres which can be bonded together to produce an ultra light weight closed-cell foam. Processing and properties of this class of low density structures will be discussed.

Clancy, R.B.; Sanders, T.H. Jr.; Cochran, J.K.

1991-12-31T23:59:59.000Z

189

Growth dynamics at a metal-metal interface  

Science Journals Connector (OSTI)

A determination of the sticking coefficient of sputter-deposited metal films on freshly deposited metal surfaces is described in detail. The systems investigated were Mo deposited on Ta and Ta on Mo. Also described is a detailed determination of the structure of Mo-Ta interfaces using Rutherford backscattering spectrometry and a combination of x-ray diffraction techniques. Within a few angstroms of each interface we find that the lattice is stretched in the growth direction and has an excess of defects relative to the bulk lattice. We also find that Mo/Ta superlattices fabricated with wavelengths in the range 20 to 120 A? exhibit structural coherence extending over a number of superlattice layers.

Wayne R. Bennett; J. A. Leavitt; Charles M. Falco

1987-03-15T23:59:59.000Z

190

Fuel Fabrication Facility  

National Nuclear Security Administration (NNSA)

Construction of the Mixed Oxide Fuel Fabrication Facility Construction of the Mixed Oxide Fuel Fabrication Facility November 2005 May 2007 June 2008 May 2012...

191

Laser Additive Manufacturing of Aerospace Large Metallic Structural Components: State of the Arts and Challenges  

Science Journals Connector (OSTI)

In this presentation, R&D progresses on processing, microstructure control and mechanical properties optimization and of laser deposition near-net-shaping of large metallic...

Wang, Huaming; Zhang, S q; Tang, H b; Tian, X j; Liu, D

192

Residue-free fabrication of high-performance graphene devices by patterned PMMA stencil mask  

SciTech Connect (OSTI)

Two-dimensional (2D) atomic crystals and their hybrid structures have recently attracted much attention due to their potential applications. The fabrication of metallic contacts or nanostructures on 2D materials is very common and generally achieved by performing electron-beam (e-beam) lithography. However, e-beam lithography is not applicable in certain situations, e.g., cases in which the e-beam resist does not adhere to the substrates or the intrinsic properties of the 2D materials are greatly altered and degraded. Here, we present a residue-free approach for fabricating high-performance graphene devices by patterning a thin film of e-beam resist as a stencil mask. This technique can be generally applied to substrates with varying surface conditions, while causing negligible residues on graphene. The technique also preserves the design flexibility offered by e-beam lithography and therefore allows us to fabricate multi-probe metallic contacts. The graphene field-effect transistors fabricated by this method exhibit smooth surfaces, high mobility, and distinct magnetotransport properties, confirming the advantages and versatility of the presented residue-free technique for the fabrication of devices composed of 2D materials.

Shih, Fu-Yu [Department of Physics, National Taiwan University, Taipei 10617, Taiwan (China); Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan (China); Chen, Shao-Yu; Wu, Tsuei-Shin; Wang, Wei-Hua, E-mail: wwang@sinica.edu.tw [Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan (China); Liu, Cheng-Hua; Chen, Yang-Fang [Department of Physics, National Taiwan University, Taipei 10617, Taiwan (China); Ho, Po-Hsun; Chen, Chun-Wei [Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan (China)

2014-06-15T23:59:59.000Z

193

Management Staff | Central Fabrication Services | Brookhaven National  

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

Management Staff Management Staff Al Farland Al Farland Central Fabrication Services General Supervisor Welding, Sheet Metal, and Maintenance Metal Work Supervisor Al Farland joined the Laboratory in 1978 with over 20 years of experience in the metal fabrication industry. Al worked on the floor before becoming a supervisor and is familiar and responsible for the Central Fabrication Services group. Phone: (631) 344-8462 Fax: (631) 344-7208 Email: farland@bnl.gov Kevin Campbell Kevin Campbell Machine Shop Supervisor Kevin Campbell came to the Laboratory in 2008 as a programmer/planner/estimator and has since been promoted to Machine Shop Supervisor. Kevin is responsible for Machine shop operations. Phone: (631) 344-3498 Fax: (631) 344-7208 Email: kcampbell@bnl.gov Chris Manning Chris Manning

194

Crystal Structure of Escherichia coli CusC the Outer Membrane Component of a Heavy Metal Efflux Pump  

SciTech Connect (OSTI)

While copper has essential functions as an enzymatic co-factor, excess copper ions are toxic for cells, necessitating mechanisms for regulating its levels. The cusCBFA operon of E. coli encodes a four-component efflux pump dedicated to the extrusion of Cu(I) and Ag(I) ions. We have solved the X-ray crystal structure of CusC, the outer membrane component of the Cus heavy metal efflux pump, to 2.3 {angstrom} resolution. The structure has the largest extracellular opening of any outer membrane factor (OMF) protein and suggests, for the first time, the presence of a tri-acylated N-terminal lipid anchor. The CusC protein does not have any obvious features that would make it specific for metal ions, suggesting that the narrow substrate specificity of the pump is provided by other components of the pump, most likely by the inner membrane component CusA.

R Kulathila; R Kulathila; M Indic; B van den Berg

2011-12-31T23:59:59.000Z

195

Polymorphous computing fabric  

DOE Patents [OSTI]

Fabric-based computing systems and methods are disclosed. A fabric-based computing system can include a polymorphous computing fabric that can be customized on a per application basis and a host processor in communication with said polymorphous computing fabric. The polymorphous computing fabric includes a cellular architecture that can be highly parameterized to enable a customized synthesis of fabric instances for a variety of enhanced application performances thereof. A global memory concept can also be included that provides the host processor random access to all variables and instructions associated with the polymorphous computing fabric.

Wolinski, Christophe Czeslaw (Los Alamos, NM); Gokhale, Maya B. (Los Alamos, NM); McCabe, Kevin Peter (Los Alamos, NM)

2011-01-18T23:59:59.000Z

196

Fabrication of transparent ceramics using nanoparticles  

DOE Patents [OSTI]

A method of fabrication of a transparent ceramic using nanoparticles synthesized via organic acid complexation-combustion includes providing metal salts, dissolving said metal salts to produce an aqueous salt solution, adding an organic chelating agent to produce a complexed-metal sol, heating said complexed-metal sol to produce a gel, drying said gel to produce a powder, combusting said powder to produce nano-particles, calcining said nano-particles to produce oxide nano-particles, forming said oxide nano-particles into a green body, and sintering said green body to produce the transparent ceramic.

Cherepy, Nerine J; Tillotson, Thomas M; Kuntz, Joshua D; Payne, Stephen A

2012-09-18T23:59:59.000Z

197

The Velocity of Oxidation of the Metals and the Structure of Coloured Oxide Films  

Science Journals Connector (OSTI)

... The simplest explanation of these facts would appear to be that the treatment causes a roughening of the surface, whereby the effective area of the metal is increased. If this ...

D. H. BANGHAM; J. STAFFORD

1925-01-17T23:59:59.000Z

198

Interplay between electronic structure and catalytic activity in transition metal oxide model system  

E-Print Network [OSTI]

The efficiency of many energy storage and conversion technologies, such as hydrogen fuel cells, rechargeable metal-air batteries, and hydrogen production from water splitting, is limited by the slow kinetics of the oxygen ...

Suntivich, Jin

2012-01-01T23:59:59.000Z

199

Apparatus and method for fabricating a microbattery  

DOE Patents [OSTI]

An apparatus and method for fabricating a microbattery that uses silicon as the structural component, packaging component, and semiconductor to reduce the weight, size, and cost of thin film battery technology is described. When combined with advanced semiconductor packaging techniques, such a silicon-based microbattery enables the fabrication of autonomous, highly functional, integrated microsystems having broad applicability.

Shul, Randy J. (Albuquerque, NM); Kravitz, Stanley H. (Albuquerque, NM); Christenson, Todd R. (Albuquerque, NM); Zipperian, Thomas E. (Edgewood, NM); Ingersoll, David (Albuquerque, NM)

2002-01-01T23:59:59.000Z

200

Surface structures from low energy electron diffraction: Atoms, small molecules and an ordered ice film on metal surfaces  

SciTech Connect (OSTI)

We investigated the surface bonding of various adsorbates (0, S, C{sub 2}H{sub 3} and NO) along with the resulting relaxation of the Pt(111) surface using low energy electron diffiraction (LEED). LEED experiments have been performed on these ordered overlayers along with theoretical structural analysis using automated tensor LEED (ATLEED). The resulting surface structures of these ordered overlayers exhibit similar adsorbate-induced relaxations. In all cases the adsorbate occupies the fcc hollow site and induces an approximately 0.1 A buckling of the metal surface. The three metal atoms directly bonded to the adsorbate are ``pulled`` out of the surface and the metal atom that is not bound to the adsorbate is `pushed`` inward. In order to understand the reliability of such details, we have carried out a comprehensive study of various non-structural parameters used in a LEED computation. We also studied the adsorption of water on the Pt(lll) surface. We ordered an ultra thin ice film on this surface. The film`s surface is found to be the (0001) face of hexagonal ice. This surface is apparently terminated by a full-bilayer, in which the uppermost water molecules have large vibrational amplitudes even at temperatures as low as 90 K. We examined two other metal surfaces besides Pt(111): Ni(111) and Fe(lll). On Ni(111), we have studied the surface under a high coverage of NO. On both Ni(111) and Pt(111) NO molecules occupy the hollow sites and the N-0 bond distances are practically identical. The challenging sample preparation of an Fe(111) surface has been investigated and a successful procedure has been obtained. The small interlayer spacing found on Fe(111) required special treatment in the LEED calculations. A new ATLEED program has been developed to handle this surface.

Materer, N.F.

1995-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" 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

JOURNAL DE PHYSIQUE Colloque C4, supplkment au no 10, Tome 38, octobre 1977, page C4-146 ADSORBED METAL LAYERS :STRUCTURE, WORK FUNCTION AND BONDING  

E-Print Network [OSTI]

JOURNAL DE PHYSIQUE Colloque C4, supplkment au no 10, Tome 38, octobre 1977, page C4-146 ADSORBED. - Adsorbate-substrate and adsorbate-adsorbate interactions determine the structure, the energetics, kinetics description of metal-metal adsorbate-substrate systems as a function of coverage still is not available

Paris-Sud XI, Université de

202

ElectronicFabrication  

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

Fabrication Fabrication Manufacturing Technologies Electronic Fabrication provides our cus- tomers solutions for the packaging design, production acceptable prototype fabrica- tion, or deliverable production fabrication. Capabilities * Final electronic product packaging from sketches and verbal instructions * Provide CAD drawing package after project completion if no formal prints are available * Complete system development and fab- rication through concurrent engineering * Concurrent engineering in prototype and production fabrication * Integrate commercial equipment into prototype system design * Implementation and modification of commercial equipment * Packaging of prototype into finalized product assembly Resources * Customer assistance from fabrication, to testing, to complete system installation

203

Magnetoresistance and electronic structure of the half-metallic ferrimagnet BiCu3Mn4O12  

Science Journals Connector (OSTI)

A cubic ordered perovskite BiCu3Mn4O12 has been synthesized under 6GPa and 1000C. BiCu3Mn4O12 is a ferrimagnet with TC=350K and its saturated magnetic moment is 10.5?B?f.u. The material showed low-resistive metallic behavior and magnetoresistance (MR) below TC. Its MR was observed over a wide temperature range, and the low-field MR reached ?28% at 5K. An electronic structure calculation revealed that it had a half-metallic nature and that the large MR observed under a low magnetic field was attributed to a spin-polarized tunneling or spin-dependent scattering effect at grain boundaries.

Kazuhide Takata; Ikuya Yamada; Masaki Azuma; Mikio Takano; Yuichi Shimakawa

2007-07-23T23:59:59.000Z

204

FINAL TECHNICAL REPORT Synthetic, Structural and Mechanistic Investigations of Olefin Polymerization Catalyzed by Early Transition Metal Compounds  

SciTech Connect (OSTI)

The goal of this project is to develop new catalysts and provide understanding of ligand effects on catalyst composition in order to guide development of superior catalyst systems for polymerization of olefins. Our group is designing and synthesizing new LX2,pincer type ligands and complexing early transition metals to afford precatalysts. In a collaboration with Hans Brintzinger from the University of Konstanz, we are also examining the structures of the components of catalyst systems obtained from reaction of zirconocene dichlorides with aluminum alkyls and aluminum hydrides. Such systems are currently used commercially to produce polyolefins, but the nature of the active and dormant species as well as the mechanisms of their interconversions are not understood. New information on catalyst design and performance may lead to new types of polymers and/or new chemical transformations between hydrocarbons and transition metal centers, ultimately contributing to the development of catalytic reactions for the production of fuels, commodity and polymeric materials.

Bercaw, John E. [California Institute of Technology

2014-05-23T23:59:59.000Z

205

The electronic structure of an S-pair in barrier-less metal/silicon junctions  

SciTech Connect (OSTI)

With S atoms doping into a bulk Si, it is revealed through first principles calculations that the highly S concentrated bulk Si is metallic. S atoms can be highly doped in the bulk Si because an S-pair located face to face in adjacent Si lattice sites gains a large energy and forms sp{sup 2} + p{sub z} electronic configurations and extra donor electrons. Schottky junction will be thus barrier-less by the Si metallization, well agreeing with experimental analyses.

Kato, K.; Nishi, Y.; Marukame, T.; Mitani, Y. [Advanced LSI Technology Laboratory, Toshiba Corporate R and D Center (Japan)

2013-12-04T23:59:59.000Z

206

An experimental investigation of the energy-attenuation capabilities of various-shaped compliable metal structures  

E-Print Network [OSTI]

~ Redesigned Drop Carriage 18 5 ~ Acceleration versus Time Curve for Compliable Structure Shape D (Al 6061- T6). 28 Acceleration versus Time Curve for Compliable Structure Shape D (Al 2024 ? T3). 28 7 ~ Acceleration versus Time Curve for Compliable... Structure Shape H (Al 2024 - T3). . 29 8. Acceleration versus Time Curve for Compliable Structure Shape G (Al 2024 - T3) . . 29 LIST OF FIGURES Figure Page Representative Shape of Ideal Acceleration versus Time Curve 2 \\ Compliable Structures - Shape...

Harding, Lynn Blackmore

1964-01-01T23:59:59.000Z

207

Metal oxide films on metal  

DOE Patents [OSTI]

A structure including a thin film of a conductive alkaline earth metal oxide selected from the group consisting of strontium ruthenium trioxide, calcium ruthenium trioxide, barium ruthenium trioxide, lanthanum-strontium cobalt oxide or mixed alkaline earth ruthenium trioxides thereof upon a thin film of a noble metal such as platinum is provided.

Wu, Xin D. (Los Alamos, NM); Tiwari, Prabhat (Los Alamos, NM)

1995-01-01T23:59:59.000Z

208

Neutron generators with size scalability, ease of fabrication and multiple ion source functionalities  

DOE Patents [OSTI]

A neutron generator is provided with a flat, rectilinear geometry and surface mounted metallizations. This construction provides scalability and ease of fabrication, and permits multiple ion source functionalities.

Elizondo-Decanini, Juan M

2014-11-18T23:59:59.000Z

209

Computational Studies of the Electronic Structures and Mechanisms of Late Transition Metal Systems  

E-Print Network [OSTI]

that were studied. The first system focuses on the formation of a carbon-bromine bond from the reaction of Ni(Ar)(Br)(pic) (Ar = 2-phenylpyridine, pic = 2-picoloine) with Br2. Unlike the typical behavior of heavier group 10 metals that have a wider range...

Pitts, Amanda

2013-08-27T23:59:59.000Z

210

PublishedbyManeyPublishing(c)IOMCommunicationsLtd Growth and structure of supported metal  

E-Print Network [OSTI]

particles P. J. F. Harris The applications of supported metal catalysts vary widely, from selective of particle/substrate interface for particle containing i, j atoms initial particle diameter particle diffusivity for particle containing i, j atoms particle diffusion coefficient surface self

Harris, Peter J F

211

Band structure engineering of anatase TiO{sub 2} by metal-assisted P-O coupling  

SciTech Connect (OSTI)

In this work, we demonstrate that the metal-assisted P-O coupling is an effective approach to improve the photoelectrochemical properties of TiO{sub 2}. The (Sc + P) and (In + P) codoping effects on electronic structures and photocatalytic activities of anatase TiO{sub 2} are examined by performing hybrid density functional theory calculations. It is found that the coupling of P dopant with the second-nearest neighboring O atom assisted by acceptor metals (Sc/In) leads to the fully occupied and delocalized intermediate bands within the band gap of anatase TiO{sub 2}, which is driven by the P-O antibonding states (?*). This metal-assisted P-O coupling can prevent the recombination of photogenerated electron-hole pairs and effectively reduce the band gap of TiO{sub 2}. Moreover, the band edge alignments in (Sc + P) and (In + P) codoped anatase TiO{sub 2} are desirable for water-splitting. The calculated optical absorption curves indicate that (Sc + P) and (In + P) codoping in anatase TiO{sub 2} can also effectively enhance the visible light absorption.

Wang, Jiajun; Meng, Qiangqiang [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China)] [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); Huang, Jing [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China) [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601 (China); Li, Qunxiang, E-mail: liqun@ustc.edu.cn; Yang, Jinlong [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China) [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)

2014-05-07T23:59:59.000Z

212

High-pressure structure of half-metallic CrO2 B. R. Maddox  

E-Print Network [OSTI]

transition from rutile -CrO2 phase I P42/mnm to orthorhombic -CrO2 phase II CaCl2-like, Pnnm is presented. The transition to the CaCl2 structure, which appears to be second order, occurs at 12±3 GPa without any typically transforms to another sixfold-coordinated structure, CaCl2, or the -PbO2 structure found in shock

Pickett, Warren

213

Spacecraft fabrication and test MODIL. Final report  

SciTech Connect (OSTI)

This report covers the period from October 1992 through the close of the project. FY 92 closed out with the successful briefing to industry and with many potential and important initiatives in the spacecraft arena. Due to the funding uncertainties, we were directed to proceed as if our funding would be approximately the same as FY 92 ($2M), but not to make any major new commitments. However, the MODIL`s FY 93 funding was reduced to $810K and we were directed to concentrate on the cryocooler area. The cryocooler effort completed its demonstration project. The final meetings with the cryocooler fabricators were very encouraging as we witnessed the enthusiastic reception of technology to help them reduce fabrication uncertainties. Support of the USAF Phillips Laboratory cryocooler program was continued including kick-off meetings for the Prototype Spacecraft Cryocooler (PSC). Under Phillips Laboratory support, Gill Cruz visited British Aerospace and Lucas Aerospace in the United Kingdom to assess their manufacturing capabilities. In the Automated Spacecraft & Assembly Project (ASAP), contracts were pursued for the analysis by four Brilliant Eyes prime contractors to provide a proprietary snap shot of their current status of Integrated Product Development. In the materials and structure thrust the final analysis was completed of the samples made under the contract (``Partial Automation of Matched Metal Net Shape Molding of Continuous Fiber Composites``) to SPARTA. The Precision Technologies thrust funded the Jet Propulsion Laboratory to prepare a plan to develop a Computer Aided Alignment capability to significantly reduce the time for alignment and even possibly provide real time and remote alignment capability of systems in flight.

Saito, T.T.

1994-05-01T23:59:59.000Z

214

Nano-structured Organic-Metal Interface for High Efficiency Organic Solar Cells  

Science Journals Connector (OSTI)

High bimolecular recombination has been identified as a performance limiting parameter in organic solar cells. To counter this issue, we introduce a structured-junction device...

Pandey, Ajay K; Aljada, Muhsen; Velusamy, M; Burn, Paul L; Meredith, Paul

215

Metal-Pyrrolide Complexes in Three-fold Symmetry: Synthesis, Structure, Reactivity and Magnetism  

E-Print Network [OSTI]

Structure, Reactivity and Magnetism by William Hill Harman AStructure, Reactivity and Magnetism by William Hill Harmanlost time. Dave taught me magnetism and what it takes to win

Harman, William Hill

2010-01-01T23:59:59.000Z

216

Accurate Band-Structure Calculations for the 3d Transition Metal...  

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

qualitatively improve the calculated bandgap energies (see table). * Using this method, electronic structure calculations with correct d-band energies and accurate absorption...

217

Purifying metallurgical silicon to solar grade silicon by metal-assisted chemical etching  

Science Journals Connector (OSTI)

Metal impurities have detrimental effects on the performance of Si solar cells. Through metal assisted chemical etching, we fabricate Si nanowires from metallurgical Si while purifying...

Li, Xiaopeng; Sprafke, Alexander N; Schweizer, Stefan L; Wehrspohn, Ralf

218

Update on US High Density Fuel Fabrication Development  

SciTech Connect (OSTI)

Second generation uranium molybdenum fuel has shown excellent in-reactor irradiation performance. This metallic fuel type is capable of being fabricated at much higher loadings than any presently used research reactor fuel. Due to the broad range of fuel types this alloy system encompassesfuel powder to monolithic foil and binary fuel systems to multiple element additionssignificant amounts of research and development have been conducted on the fabrication of these fuels. This paper presents an update of the US RERTR effort to develop fabrication techniques and the fabrication methods used for the RERTR-9A miniplate test.

C.R. Clark; G.A. Moore; J.F. Jue; B.H. Park; N.P. Hallinan; D.M. Wachs; D.E. Burkes

2007-03-01T23:59:59.000Z

219

Experimental investigation and constitutive modeling of metallic honeycombs in sandwich structures  

E-Print Network [OSTI]

Traditionally, honeycomb sandwich structures are designed in the elastic range, but recent studies on the crushing of sandwich profiles have shown their potential in crashworthiness applications. Thin sandwich sheets also ...

Mohr, Dirk, 1976-

2003-01-01T23:59:59.000Z

220

Free form fabrication of thermoplastic composites  

SciTech Connect (OSTI)

This report describes the results of composites fabrication research sponsored by the Laboratory Directed Research and Development (LDRD) program at Sandia National Laboratories. They have developed, prototyped, and demonstrated the feasibility of a novel robotic technique for rapid fabrication of composite structures. Its chief innovation is that, unlike all other available fabrication methods, it does not require a mold. Instead, the structure is built patch by patch, using a rapidly reconfigurable forming surface, and a robot to position the evolving part. Both of these components are programmable, so only the control software needs to be changed to produce a new shape. Hence it should be possible to automatically program the system to produce a shape directly from an electronic model of it. It is therefore likely that the method will enable faster and less expensive fabrication of composites.

Kaufman, S.G.; Spletzer, B.L.; Guess, T.R.

1998-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" 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

Ultrathin aluminum oxide films: Al-sublattice structure and the effect of substrate on ad-metal adhesion  

SciTech Connect (OSTI)

First principles density-functional slab calculations are used to study 5 {angstrom} (two O-layer) Al{sub 2}O{sub 3} films on Ru(0001) and Al(111). Using larger unit cells than in a recent study, it is found that the lowest energy stable film has an even mix of tetrahedral (t) and octahedral (o) site Al ions, and thus most closely resembles the {kappa}-phase of bulk alumina. Here, alternating zig-zag rows of t and o occur within the surface plane, resulting in a greater average lateral separation of the Al-ions than with pure t or o. A second structure with an even mix of t and o has also been found, consisting of alternating stripes. These patterns mix easily, can exist in three equivalent directions on basal substrates, and can also be displaced laterally, suggesting a mechanism for a loss of long-range order in the Al-sublattice. While the latter would cause the film to appear amorphous in diffraction experiments, local coordination and film density are little affected. On a film supported by rigid Ru(0001), overlayers of Cu, Pd, and Pt bind similarly as on bulk truncated {alpha}-Al{sub 2}O{sub 3}(0001). However, when the film is supported by soft Al(111), the adhesion of Cu, Pd, and Pt metal overlayers is significantly increased: Oxide-surface Al atoms rise so only they contact the overlayer, while substrate Al metal atoms migrate into the oxide film. Thus the binding energy of metal overlayers is strongly substrate dependent, and these numbers for the above Pd-overlayer systems bracket a recent experimentally derived value for a film on NiAl(110).

JENNISON,DWIGHT R.; BOGICEVIC,ALEXANDER

2000-03-06T23:59:59.000Z

222

Controlled incorporation of mid-to-high Z transition metals in CVD diamond  

SciTech Connect (OSTI)

We report on a general method to fabricate transition metal related defects in diamond. Controlled incorporation of Mo and W in synthetic CVD diamond was achieved by adding volatile metal precursors to the diamond chemical vapor deposition (CVD) growth process. Effects of deposition temperature, grain structure and precursor exposure on the doping level were systematically studied, and doping levels of up to 0.25 at.% have been achieved. The metal atoms are uniformly distributed throughout the diamond grains without any indication of inclusion formation. These results are discussed in context of the kinetically controlled growth process of CVD diamond.

Biener, M M; Biener, J; Kucheyev, S O; Wang, Y M; El-Dasher, B; Teslich, N E; Hamza, A V; Obloh, H; Mueller-Sebert, W; Wolfer, M; Fuchs, T; Grimm, M; Kriele, A; Wild, C

2010-01-08T23:59:59.000Z

223

Alkali-metal stoichiometry and structure of K4C60 and Rb4C60  

Science Journals Connector (OSTI)

Alkali-metal fulleride samples KxC60 and RbxC60 with stoichiometries close to x=4 were examined with x-ray powder-diffraction measurements at room temperature. We have shown through Rietveld refinements that A4C60 is a line phase with charge per lattice site that is closer to integer than in any other fulleride. The C60 molecules are disordered between two possible orientations within the body-centered-tetragonal lattice with the three orthogonal twofold rotation axes aligned with the unit-cell translation vectors in space group I4/mmm. The x-ray diffraction results exclude any quadrupole distortion of the fullerene molecule beyond about 0.04 ?. These results suggest that K4C60 and Rb4C60 may be Mott insulators.

Christine A. Kuntscher; Gtz M. Bendele; Peter W. Stephens

1997-02-01T23:59:59.000Z

224

Emission intensity in the visible and IR spectral ranges from Si-based structures formed by direct bonding with simultaneous doping with erbium (Er) and europium (Eu)  

SciTech Connect (OSTI)

The photo- and electroluminescence spectra of silicon-based structures formed by direct bonding with simultaneous doping with rare-earth metals are studied. It is shown that emission in the visible and IR spectral ranges can be obtained from n-Si:Er/p-Si and n-Si:Eu/p-Si structures fabricated by the method suggested in the study. The results obtained make this method promising for the fabrication of optoelectronic devices.

Mezdrogina, M. M., E-mail: margaret.m@mail.ioffe.ru; Kostina, L. S.; Beliakova, E. I.; Kuzmin, R. V. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)

2013-09-15T23:59:59.000Z

225

Magnetism, structure, and charge correlation at a pressure-induced Mott-Hubbard insulator-metal transition  

SciTech Connect (OSTI)

We use synchrotron x-ray diffraction and electrical transport under pressure to probe both the magnetism and the structure of single-crystal NiS{sub 2} across its Mott-Hubbard transition. In the insulator, the low-temperature antiferromagnetic order results from superexchange among correlated electrons and couples to a (1/2, 1/2, 1/2) superlattice distortion. Applying pressure suppresses the insulating state, but enhances the magnetism as the superexchange increases with decreasing lattice constant. By comparing our results under pressure to previous studies of doped crystals, we show that this dependence of the magnetism on the lattice constant is consistent for both band broadening and band filling. In the high-pressure metallic phase the lattice symmetry is reduced from cubic to monoclinic, pointing to the primary influence of charge correlations at the transition. There exists a wide regime of phase separation that may be a general characteristic of correlated quantum matter.

Feng, Y.; Jaramillo, R.; Banerjee, A.; Honig, J. M.; Rosenbaum, T. F. (X-Ray Science Division); (Univ. of Chicago); (Harvard Univ.); (Purdue Univ.)

2011-01-01T23:59:59.000Z

226

Magnetic and structural characterization of transition metal co-doped CdS nanoparticles  

Science Journals Connector (OSTI)

We report the structural and magnetic properties of the CdS nanoparticles co-doped with Ni and Cu; 3% Ni, Cu co-doped CdS nanoparticles were synthesized by using wet chemical ... average diameter of the Ni, Cu co...

Sanjeev Kumar; Sunil Kumar; Sanyog Jain; N. K. Verma

2012-06-01T23:59:59.000Z

227

Structural and IR relations among brucite-like divalent metal hydroxides  

Science Journals Connector (OSTI)

The a and c unit cell parameters of M(OH)2, brucite-like structures with M=Mg, Ni,...VI and OIV. The a parameters are related to (M-O) by flattening of the octahedral coordination groups, with a flattening angle ...

G. W. Brindley; Chih-Chun Kao

1984-03-01T23:59:59.000Z

228

Structure and chemistry of a metal cluster with a four-coordinate carbide carbon atom  

SciTech Connect (OSTI)

Molecular metal clusters with carbide carbon atoms of low coordination number have been prepared; they are the anionic (HFe/sub 4/C(CO)/sub 12//sup -/) and (Fe/sub 4/C(CO)/sub 12//sup 2 -/) clusters. An x-ray crystallographic analysis of a tetraaminozinc salt of the latter has established a butterfly array of iron atoms with the carbide carbon atom centered above the wings of the Fe/sub 4/ core. Each iron atom was bonded to three peripheral carbonyl ligands. The distances from the carbide carbon to iron were relatively short, particularly those to the apical iron atoms (1.80 A average). Protonation of the anionic carbide clusters reversibly yielded HFe/sub 4/(CH)(CO)/sub 12/, and methylation of the dianion gave (Fe/sub 4/(CC(O)CH/sub 3/)(CO)/sub 12//sup -/). Oxidation of (Fe/sub 4/C(CO)/sub 12//sup 2 -/) yielded the coordinately unsaturated Fe/sub 4/C(CO)/sub 12/ cluster, which was extremely reactive. Hydrogen addition to this iron cluster was rapid below 0/sup 0/C, and a C-H bond was formed in this transformation.

Davis, J.H. (Argonne National Lab., IL); Beno, M.A.; Williams, J.M.; Zimmie, J.A.; Tachikawa, M.; Muetterties, E.L.

1981-02-01T23:59:59.000Z

229

Biaxial Creep Specimen Fabrication  

SciTech Connect (OSTI)

This report documents the results of the weld development and abbreviated weld qualification efforts performed by Pacific Northwest National Laboratory (PNNL) for refractory metal and superalloy biaxial creep specimens. Biaxial creep specimens were to be assembled, electron beam welded, laser-seal welded, and pressurized at PNNL for both in-pile (JOYO reactor, O-arai, Japan) and out-of-pile creep testing. The objective of this test campaign was to evaluate the creep behavior of primary cladding and structural alloys under consideration for the Prometheus space reactor. PNNL successfully developed electron beam weld parameters for six of these materials prior to the termination of the Naval Reactors program effort to deliver a space reactor for Project Prometheus. These materials were FS-85, ASTAR-811C, T-111, Alloy 617, Haynes 230, and Nirnonic PE16. Early termination of the NR space program precluded the development of laser welding parameters for post-pressurization seal weldments.

JL Bump; RF Luther

2006-02-09T23:59:59.000Z

230

Services | Central Fabrication Services | Brookhaven National Laboratory  

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

Services & Capabilities Services & Capabilities The Central Fabrication Services Division's capabilities range from an Electric Discharge Machining (EDM) capability, to a state of the art cleaning facility, to a large fabricating facility which includes CNC Machining, Automatic Tube Welding, CNC Punch Press capability, and 3-D printing. CNC Auto Feed Saw High Bay Area 3-D Printer Main Shop, Building 479 Maintenance Sheet Metal Area Water Jet Machine X-ray Generating Tube CR X-ray Processor with High Resolution Monitor Low Bay Area in Machine Shop Wire EDM Machine Wire EDM Machine Oil Recycling Facility, Building 495 UHV Cleaning Facility, Building 498 Material Storage and Stock Central Fabrication Services is proud of it's highly proficient technical staff all of which are available, at no cost to the customer, for

231

An experimental approach to compare wicking abilities of fabric materials for heat pipe applications  

SciTech Connect (OSTI)

Replacement of components of a space reactor heat pipe by advanced ceramic fabrics will decrease system mass considerably. Replacement of the metal wick by a fibrous materials makes calculation of the wicking ability difficult. An experimental approach is necessary to ensure that heat transport ability is not affected considerably and to optimize material chosen for wicking structure. Variables such as material composition, surface preparation, weave type and density, and pressure/temperature variations need to be examined. Two experiments are discussed which allow complete comparison of all these variables and measurement of the wicking ability. These experiments are unique in their approach to simulation of operating conditions of the heat pipe.

Marks, T.S.; Klein, A.C. (Department of Nuclear Engineering Radiation Center, C116 Oregon State University Corvallis, OR 97331-5902 (US))

1991-01-05T23:59:59.000Z

232

Direct observation of bias-dependence potential distribution in metal/HfO{sub 2} gate stack structures by hard x-ray photoelectron spectroscopy under device operation  

SciTech Connect (OSTI)

Although gate stack structures with high-k materials have been extensively investigated, there are some issues to be solved for the formation of high quality gate stack structures. In the present study, we employed hard x-ray photoelectron spectroscopy in operating devices. This method allows us to investigate bias dependent electronic states, while keeping device structures intact. Using this method, we have investigated electronic states and potential distribution in gate metal/HfO{sub 2} gate stack structures under device operation. Analysis of the core levels shifts as a function of the bias voltage indicated that a potential drop occurred at the Pt/HfO{sub 2} interface for a Pt/HfO{sub 2} gate structure, while a potential gradient was not observed at the Ru/HfO{sub 2} interface for a Ru/HfO{sub 2} gate structure. Angle resolved photoelectron spectroscopy revealed that a thicker SiO{sub 2} layer was formed at the Pt/HfO{sub 2} interface, indicating that the origin of potential drop at Pt/HfO{sub 2} interface is formation of the thick SiO{sub 2} layer at the interface. The formation of the thick SiO{sub 2} layer at the metal/high-k interface might concern the Fermi level pinning, which is observed in metal/high-k gate stack structures.

Yamashita, Y. [National Institute for Materials Science, Advanced Electric Materials Center, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); National Institute for Materials Science, NIMS Beamline Station at SPring-8, 1-1-1 Kto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan); Yoshikawa, H.; Kobayashi, K. [National Institute for Materials Science, NIMS Beamline Station at SPring-8, 1-1-1 Kto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan); Chikyo, T. [National Institute for Materials Science, Advanced Electric Materials Center, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)

2014-01-28T23:59:59.000Z

233

Structural and functional analyses of a glutaminyl cyclase from Ixodes scapularis reveal metal-independent catalysis and inhibitor binding  

Science Journals Connector (OSTI)

A metal-independent glutaminyl cyclase from the black-legged tick I. scapularis is reported. The metal-independent inhibition of glutaminyl cyclases by imidazole-derived inhibitors is described for the first time.

Huang, K.-F.

2014-02-22T23:59:59.000Z

234

Ion exchange behavior among metal trisilicates: probing selectivity, structures, and mechanism  

E-Print Network [OSTI]

structures.30 1.3.3. Zirconium trisilicates In terms of unit cell volume, the zirconium trisilicate is the largest trisilicate with a volume of approximately 9873 corresponding to the potassium phase, K2ZrSi3O9H2O. A thorough study... geometry was consistent and chemically meaningful. Isotropic thermal factors for zirconium, each cation position, and water oxygen were then refined keeping silicon and oxygen factors fixed. No attempt was made to describe the water hydrogen positions...

Fewox, Christopher Sean

2008-10-10T23:59:59.000Z

235

Method to fabricate hollow microneedle arrays  

DOE Patents [OSTI]

An inexpensive and rapid method for fabricating arrays of hollow microneedles uses a photoetchable glass. Furthermore, the glass hollow microneedle array can be used to form a negative mold for replicating microneedles in biocompatible polymers or metals. These microneedle arrays can be used to extract fluids from plants or animals. Glucose transport through these hollow microneedles arrays has been found to be orders of magnitude more rapid than natural diffusion.

Kravitz, Stanley H. (Placitas, NM); Ingersoll, David (Albuquerque, NM); Schmidt, Carrie (Los Lunas, NM); Flemming, Jeb (Albuquerque, NM)

2006-11-07T23:59:59.000Z

236

Structural Investigations of Silica Polyamine Composites: Surface Coverage, Metal Ion Coordination, and Ligand Modification  

SciTech Connect (OSTI)

Silanization of the silica gel surface in the synthesis of silica gel polyamine composites uses (chloropropyl)-trichlorosilane (CPTCS). It is possible to substitute a molar fraction of reagent CPTCS with methyltrichlorosilane (MTCS), creating a mixed silane surface layer. Two types of silica gels were modified with a series of MTCS:CPTCS molar ratios. Solid-state CP/MAS 29Si and 13C NMR spectroscopies were used to evaluate the surface silane composition. Surface silane coverage was markedly improved for the resulting gels. When polyamines were grafted to the resultant MTCS:CPTCS silane layers, it was shown that the decrease in the number of propyl attachments to the polyamine resulted in increased quantities of ''free amines''. Optimum MTCS:CPTCS ratios were determined for three polyamines grafted onto one silica gel. A substantial free amine increase was observed for poly(allylamine) (PAA). Metal uptake studies show increases in Cu(II) capacity and/or an improvement in Cu(II) mass-transfer kinetics. The effect of polymer molecular weight upon Cu(II) capacity was investigated for each polyamine. Substantial differences in Cu(II) capacity between 50,000 MW poly(vinylamine) (PVA) and >1000 MW PVA were evident. Similar differences between 25,000 MW poly(ethyleneimine) (PEI) and 1200 MW PEI were found. The mass-transfer kinetics was shown to be improved for composites prepared using a large fraction of MTCS in the reagent silane mixture. This resulted in substantial improvements in the 10% breakthrough Cu(II) capacity for PVA (50 000 MW). PEI composites were further modified to form an amino-acetate ligand. The impact of the MTCS:CPTCS silane ratio on the acetate ligand loading and ultimately on the Cu(II) capacity at pH 2 was investigated. A ratio of 12.5:1 was shown to result in an acetate modified PEI composite with a Cu(II) capacity 140% of the Cu(II) capacity of the same composite prepared with ''CPTCS only''.

Hughes, Mark; Nielsen, Daniel; Rosenberg, Edward; Gobetto, Roberto; Viale, Alessandra; Burton, Sarah D.; Ferel, Joseph

2006-09-13T23:59:59.000Z

237

Fabrication and Characterization of CIS/CdS and Cu2S/CdS Devices for Applications in Nano Structured Solar Cells.  

E-Print Network [OSTI]

??Nano structured solar cells provide an opportunity for increased open circuit voltages and and short circuit currents in solar cells due to quantum confinement of (more)

Jayaraman, Visweswaran

2005-01-01T23:59:59.000Z

238

Crystal Structure of (+)-[delta]-Cadinene Synthase from Gossypium arboreum and Evolutionary Divergence of Metal Binding Motifs for Catalysis  

SciTech Connect (OSTI)

(+)-{delta}-Cadinene synthase (DCS) from Gossypium arboreum (tree cotton) is a sesquiterpene cyclase that catalyzes the cyclization of farnesyl diphosphate in the first committed step of the biosynthesis of gossypol, a phytoalexin that defends the plant from bacterial and fungal pathogens. Here, we report the X-ray crystal structure of unliganded DCS at 2.4 {angstrom} resolution and the structure of its complex with three putative Mg{sup 2+} ions and the substrate analogue inhibitor 2-fluorofarnesyl diphosphate (2F-FPP) at 2.75 {angstrom} resolution. These structures illuminate unusual features that accommodate the trinuclear metal cluster required for substrate binding and catalysis. Like other terpenoid cyclases, DCS contains a characteristic aspartate-rich D{sup 307}DTYD{sup 311} motif on helix D that interacts with Mg{sub A}{sup 2+} and Mg{sub C}{sup 2+}. However, DCS appears to be unique among terpenoid cyclases in that it does not contain the 'NSE/DTE' motif on helix H that specifically chelates Mg{sub B}{sup 2+}, which is usually found as the signature sequence (N,D)D(L,I,V)X(S,T)XXXE (boldface indicates Mg{sub B}{sup 2+} ligands). Instead, DCS contains a second aspartate-rich motif, D{sup 451}DVAE{sup 455}, that interacts with Mg{sub B}{sup 2+}. In this regard, DCS is more similar to the isoprenoid chain elongation enzyme farnesyl diphosphate synthase, which also contains two aspartate-rich motifs, rather than the greater family of terpenoid cyclases. Nevertheless, the structure of the DCS-2F-FPP complex shows that the structure of the trinuclear magnesium cluster is generally similar to that of other terpenoid cyclases despite the alternative Mg{sub B}{sup 2+} binding motif. Analyses of DCS mutants with alanine substitutions in the D{sup 307}DTYD{sup 311} and D{sup 451}DVAE{sup 455} segments reveal the contributions of these segments to catalysis.

Gennadios, Heather A.; Gonzalez, Veronica; Di Costanzo, Luigi; Li, Amang; Yu, Fanglei; Miller, David J.; Allemann, Rudolf K.; Christianson, David W.; (UPENN); (Cardiff); (UC)

2009-09-11T23:59:59.000Z

239

Effect of the Support on the Electronic Structure of Au Nanoparticles Supported on Transition Metal Carbides: Choice of the Best Substrate for Au Activation  

SciTech Connect (OSTI)

Periodic density functional theory calculations on large supercells have been carried out to investigate the atomic and electronic structure of small gold particles (Au{sub 2}, Au{sub 4}, Au{sub 9}, Au{sub 13}, and Au{sub 14}) supported on the (001) surface of various transition metal carbides (TiC, ZrC, VC, and {delta}-MoC). All the supported Au particles exhibited strong interactions with the C sites of the metal-carbide surfaces. Nevertheless, the interactions between adsorbed Au atoms were attractive, thus ultimately facilitating nucleation of two- or three-dimensional metal particles. The presence of the underlying carbide strongly modified the electronic structure and charge density of the supported metal particles resulting in the experimentally proven improved catalytic performance of the resulting systems as compared with cases where the support is an oxide. The electronic perturbations were quite strong for two-dimensional gold particles directly in contact with the carbide substrates and gradually decreased for two-layer and three-layer thick supported particles. While all the metal carbides examined induced a qualitatively similar perturbation on the supported Au particles, the effect is significantly larger for ZrC thus suggesting that the resulting model catalyst would perform even better than the already tried Au/TiC system.

Rodriguez, J.A.; Florez, E.; Feria, L.; Vies, F.; Illas, F.

2009-10-16T23:59:59.000Z

240

Effect of the Support on the Electronic Structure of Au Nanoparticles Supported on Transition Metal Carbides: Choice of the Best Substrate for Au Activation  

SciTech Connect (OSTI)

Periodic density functional theory calculations on large supercells have been carried out to investigate the atomic and electronic structure of small gold particles (Au{sub 2}, Au{sub 4}, Au{sub 9}, Au{sub 13}, and Au{sub 14}) supported on the (001) surface of various transition metal carbides (TiC, ZrC, VC, and {delta}-MoC). All the supported Au particles exhibited strong interactions with the C sites of the metal-carbide surfaces. Nevertheless, the interactions between adsorbed Au atoms were attractive, thus ultimately facilitating nucleation of two- or three-dimensional metal particles. The presence of the underlying carbide strongly modified the electronic structure and charge density of the supported metal particles resulting in the experimentally proven improved catalytic performance of the resulting systems as compared with cases where the support is an oxide. The electronic perturbations were quite strong for two-dimensional gold particles directly in contact with the carbide substrates and gradually decreased for two-layer and three-layer thick supported particles. While all the metal carbides examined induced a qualitatively similar perturbation on the supported Au particles, the effect is significantly larger for ZrC thus suggesting that the resulting model catalyst would perform even better than the already tried Au/TiC system.

Florez, E.; Feria, L; Vines, F; Rodriguez, J; Illas, F

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" 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

Chapter 14 - Metal oxide nanopowder  

Science Journals Connector (OSTI)

Research into soft chemical techniques has gained an importance for the synthesis of high quality advanced nanosized materials with desired properties at the low crystallization temperature. The closer interaction between the material chemists and alkoxide chemists has led to the molecular design of more suitable precursors, for fabrication of functional material has resulted in synergetic developments in both the fields. Metal alkoxide is a versatile precursor and is used for the synthesis of functional gradient nanomaterials, and characterization of materials was carried out in term of composition, microstructure and specific surface area. The write-up provides simple and convenient routes to many building blocks for assembling the structure with novel properties and its functional use in nanotechnology.

Taimur Athar

2015-01-01T23:59:59.000Z

242

Biologically inspired digital fabrication  

E-Print Network [OSTI]

Objects and systems in nature are models for the practice of sustainable design and fabrication. From trees to bones, natural systems are characterized by the constant interplay of creation, environmental response, and ...

Han, Sarah (Sarah J.)

2013-01-01T23:59:59.000Z

243

Electrical properties of silicon schottky diodes containing metal films of various compositions  

SciTech Connect (OSTI)

Au{sub x}Ti{sub 100{sub -}} {sub x}/n-Si Schottky diodes are fabricated and studied; in addition, the electrical properties of diodes containing metal films with varying composition (x = 0, 14, 30, 38, 60, 80, and 100) are also studied. Using X-ray phase analysis, it is established that the film of Au{sub 38}Ti{sub 62} composition has the amorphous structure, while the remaining films Au{sub x}Ti{sub 100-x} possess the polycrystalline structure. The main parameters of the Schottky diodes are determined in relation to the composition and structure of the metal films. As a result, it is shown that the electrical properties of Au{sub x}Ti{sub 100-x}/n-Si Schottky diodes are related to variations in the composition and structure of metal films.

Pashaev, I. G., E-mail: islampachayev@rambler.ru [Baku State University (Azerbaijan)

2013-06-15T23:59:59.000Z

244

Fabricated torque shaft  

DOE Patents [OSTI]

A fabricated torque shaft is provided that features a bolt-together design to allow vane schedule revisions with minimal hardware cost. The bolt-together design further facilitates on-site vane schedule revisions with parts that are comparatively small. The fabricated torque shaft also accommodates stage schedules that are different one from another in non-linear inter-relationships as well as non-linear schedules for a particular stage of vanes.

Mashey, Thomas Charles (Anderson, SC)

2002-01-01T23:59:59.000Z

245

Nuclear Fabrication Consortium  

SciTech Connect (OSTI)

This report summarizes the activities undertaken by EWI while under contract from the Department of Energy (DOE) â?? Office of Nuclear Energy (NE) for the management and operation of the Nuclear Fabrication Consortium (NFC). The NFC was established by EWI to independently develop, evaluate, and deploy fabrication approaches and data that support the re-establishment of the U.S. nuclear industry: ensuring that the supply chain will be competitive on a global stage, enabling more cost-effective and reliable nuclear power in a carbon constrained environment. The NFC provided a forum for member original equipment manufactures (OEM), fabricators, manufacturers, and materials suppliers to effectively engage with each other and rebuild the capacity of this supply chain by : â?¢ Identifying and removing impediments to the implementation of new construction and fabrication techniques and approaches for nuclear equipment, including system components and nuclear plants. â?¢ Providing and facilitating detailed scientific-based studies on new approaches and technologies that will have positive impacts on the cost of building of nuclear plants. â?¢ Analyzing and disseminating information about future nuclear fabrication technologies and how they could impact the North American and the International Nuclear Marketplace. â?¢ Facilitating dialog and initiate alignment among fabricators, owners, trade associations, and government agencies. â?¢ Supporting industry in helping to create a larger qualified nuclear supplier network. â?¢ Acting as an unbiased technology resource to evaluate, develop, and demonstrate new manufacturing technologies. â?¢ Creating welder and inspector training programs to help enable the necessary workforce for the upcoming construction work. â?¢ Serving as a focal point for technology, policy, and politically interested parties to share ideas and concepts associated with fabrication across the nuclear industry. The report the objectives and summaries of the Nuclear Fabrication Consortium projects. Full technical reports for each of the projects have been submitted as well.

Levesque, Stephen

2013-04-05T23:59:59.000Z

246

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

247

Method Of Bonding A Metal Connection To An Electrode Including A Core Having A Fiber Or Foam Type Structure For An Electrochemical Cell, An  

SciTech Connect (OSTI)

A method of bonding a metal connection to an electrode including a core having a fiber or foam-type structure for an electrochemical cell, in which method at least one metal strip is pressed against one edge of the core and is welded thereto under compression, wherein, at least in line with the region in which said strip is welded to the core, which is referred to as the "main core", a retaining core of a type analogous to that of the main core is disposed prior to the welding.

Loustau, Marie-Therese (Bordeaux, FR); Verhoog, Roelof (Bordeaux, FR); Precigout, Claude (Lormont, FR)

1996-09-24T23:59:59.000Z

248

Nanocrystalline-Si-dot multi-layers fabrication by chemical vapor deposition with H-plasma surface treatment and evaluation of structure and quantum confinement effects  

SciTech Connect (OSTI)

100-nm-thick nanocrystalline silicon (nano-Si)-dot multi-layers on a Si substrate were fabricated by the sequential repetition of H-plasma surface treatment, chemical vapor deposition, and surface oxidation, for over 120 times. The diameter of the nano-Si dots was 56 nm, as confirmed by both the transmission electron microscopy and X-ray diffraction analysis. The annealing process was important to improve the crystallinity of the nano-Si dot. We investigated quantum confinement effects by Raman spectroscopy and photoluminescence (PL) measurements. Based on the experimental results, we simulated the Raman spectrum using a phenomenological model. Consequently, the strain induced in the nano-Si dots was estimated by comparing the experimental and simulated results. Taking the estimated strain value into consideration, the band gap modulation was measured, and the diameter of the nano-Si dots was calculated to be 5.6 nm by using PL. The relaxation of the q ? 0 selection rule model for the nano-Si dots is believed to be important to explain both the phenomena of peak broadening on the low-wavenumber side observed in Raman spectra and the blue shift observed in PL measurements.

Kosemura, Daisuke, E-mail: d-kose@isc.meiji.ac.jp; Mizukami, Yuki; Takei, Munehisa; Numasawa, Yohichiroh; Ogura, Atsushi [School of Science and Technology, Meiji University, Kawasaki 214-8571 (Japan)] [School of Science and Technology, Meiji University, Kawasaki 214-8571 (Japan); Ohshita, Yoshio [Toyota Technological Institute, Nagoya 468-8511 (Japan)] [Toyota Technological Institute, Nagoya 468-8511 (Japan)

2014-01-15T23:59:59.000Z

249

Design and Fabrication of Photonic Crystals for Thermal Energy Conservation  

SciTech Connect (OSTI)

The vision of intelligent and large-area fabrics capable of signal processing, sensing and energy harvesting has made incorporating electronic devices into flexible fibers an active area of research. Fiber-integrated rectifying junctions in the form of photovoltaic cells and light-emitting diodes (LEDs) have been fabricated on optical fiber substrates. However, the length of these fiber devices has been limited by the processing methods and the lack of a sufficiently conductive and transparent electrode. Their cylindrical device geometry is ideal for single device architectures, like photovoltaics and LEDs, but not amenable to building multiple devices into a single fiber. In contrast, the composite preform-to-fiber approach pioneered in our group addresses the key challenges of device density and fiber length simultaneously. It allows one to construct structured fibers composed of metals, insulators and semiconductors and enables the incorporation of many devices into a single fiber capable of performing complex tasks such as of angle of incidence and color detection. However, until now, devices built by the preform-to-fiber approach have demonstrated only ohmic behavior due to the chalcogenide semiconductor's amorphous nature and defect density. From a processing standpoint, non-crystallinity is necessary to ensure that the preform viscosity during thermal drawing is large enough to extend the time-scale of breakup driven by surface tension effects in the fluids to times much longer than that of the actual drawing. The structured preform cross-section is maintained into the microscopic fiber only when this requirement is met. Unfortunately, the same disorder that is integral to the fabrication process is detrimental to the semiconductors' electronic properties, imparting large resistivities and effectively pinning the Fermi level near mid-gap. Indeed, the defect density within the mobility gap of many chalcogenides has been found to be 1018-1019 cm-3 eV-1, resulting in a narrow depletion width and ohmic behavior at metal-semiconductor junctions. In this work we incorporated phase-changing semiconductors, those that may be easily converted between the amorphous and crystalline states, into composite fibers with a goal towards constructing rectifying junctions in fiber.

Professor John Joannopoulos; Professor Yoel Fink

2009-09-17T23:59:59.000Z

250

Luminescent Study of Recombination Processes in the Single-Crystal Silicon and Silicon Structures Fabricated Using High-Efficiency Solar Cell Technology  

Science Journals Connector (OSTI)

Some results of the authors researches in the last decade of the luminescence in the region of the fundamental absorption edge (edge luminescence) of the single-crystal silicon (c-Si), including structures which...

A. M. Emelyanov

2014-01-01T23:59:59.000Z

251

Method of fabricating a multilayer insulation blanket  

DOE Patents [OSTI]

An improved multilayer insulation blanket for insulating cryogenic structures operating at very low temperatures is disclosed. An apparatus and method for fabricating the improved blanket are also disclosed. In the improved blanket, each successive layer of insulating material is greater in length and width than the preceding layer so as to accommodate thermal contraction of the layers closest to the cryogenic structure. The fabricating apparatus has a rotatable cylindrical mandrel having an outer surface of fixed radius that is substantially arcuate, preferably convex, in cross-section. The method of fabricating the improved blanket comprises (a) winding a continuous sheet of thermally reflective material around the circumference of the mandrel to form multiple layers, (b) binding the layers along two lines substantially parallel to the edges of the circumference of the mandrel, (c) cutting the layers along a line parallel to the axle of the mandrel, and (d) removing the bound layers from the mandrel.

Gonczy, John D. (Oak Lawn, IL); Niemann, Ralph C. (Downers Grove, IL); Boroski, William N. (Aurora, IL)

1993-01-01T23:59:59.000Z

252

Multilayer insulation blanket, fabricating apparatus and method  

DOE Patents [OSTI]

An improved multilayer insulation blanket for insulating cryogenic structures operating at very low temperatures is disclosed. An apparatus and method for fabricating the improved blanket are also disclosed. In the improved blanket, each successive layer of insulating material is greater in length and width than the preceding layer so as to accommodate thermal contraction of the layers closest to the cryogenic structure. The fabricating apparatus has a rotatable cylindrical mandrel having an outer surface of fixed radius that is substantially arcuate, preferably convex, in cross-section. The method of fabricating the improved blanket comprises (a) winding a continuous sheet of thermally reflective material around the circumference of the mandrel to form multiple layers, (b) binding the layers along two lines substantially parallel to the edges of the circumference of the mandrel, (c) cutting the layers along a line parallel to the axle of the mandrel, and (d) removing the bound layers from the mandrel.

Gonczy, John D. (Oak Lawn, IL); Niemann, Ralph C. (Downers Grove, IL); Boroski, William N. (Aurora, IL)

1992-01-01T23:59:59.000Z

253

Career Map: Assembler and Fabricator  

Broader source: Energy.gov [DOE]

The Wind Program's Career Map provides job description information for Assembler and Fabricator positions.

254

Fabrication and development of several heat pipe honeycomb sandwich panel concepts. Final report  

SciTech Connect (OSTI)

The feasibility of fabricating and processing liquid metal heat pipes in a low mass honeycomb sandwich panel configuration for application on the NASA Langley airframe-integrated Scramjet engine was investigated. A variety of honeycomb panel facesheet and core-ribbon wick concepts was evaluated within constraints dictated by existing manufacturing technology and equipment. The chosen design consists of an all-stainless steel structure, sintered screen facesheets, and two types of core-ribbon, a diffusion bonded wire mesh and a foil-screen composite. Cleaning, fluid charging, processing, and process port sealing techniques were established. The liquid metals, potassium, sodium and cesium were used as working fluids. Eleven honeycomb panels 15.24 cm X 15.24 cm X 2.94 cm were delivered to NASA Langley for extensive performance testing and evaluation, nine panels were processed as heat pipes, and two panels were left unprocessed.

Tanzer, H.J.

1982-06-01T23:59:59.000Z

255

Tests of concrete beams with externally-bonded glass-fiber fabric web reinforcement  

E-Print Network [OSTI]

of strengthening techniques used for rehabilitation of concrete structures is the method of using thin glass and carbon fiber fabrics, which are bonded externally to the surface of concrete. The study is focused on investigating the feasibility of using fabrics...

Dabholkar, Niranjan Shamsunder

2012-06-07T23:59:59.000Z

256

Structural Evaluation and Solution Integrity of Alkali Metal Salt Complexes of the Manganese 12-Metallacrown-4 (12-MC-4) Structural Type  

E-Print Network [OSTI]

of crystalline salts (LiCl2)[12-MCMn(III)N(shi)-4]- ([(LiCl2),1]-), (Li(trifluoro- acetate))[12-MCMn(III)N(shi)-4:1 metal:metallacrown adducts with lithium and 2:1 metal:metallacrown complexes with sodium and potassium

Gibney, Brian R.

257

DOE ER63951-3 Final Report: An Integrated Assessment of Geochemical and Community Structure Determinants of Metal Reduction Rates in Subsurface Sediments  

SciTech Connect (OSTI)

The objective of this research was to examine the importance of microbial community structure in influencing uranium reduction rates in subsurface sediments. If the redox state alone is the key to metal reduction, then any organisms that can utilize the oxygen and nitrate in the subsurface can change the geochemical conditions so metal reduction becomes an energetically favored reaction. Thus, community structure would not be critical in determining rates or extent of metal reduction unless community structure influenced the rate of change in redox. Alternatively, some microbes may directly catalyze metal reduction (e.g., specifically reduce U). In this case the composition of the community may be more important and specific types of electron donors may promote the production of communities that are more adept at U reduction. Our results helped determine if the type of electron donor or the preexisting community is important in the bioremediation of metal-contaminated environments subjected to biostimulation. In a series of experiments at the DOE FRC site in Oak Ridge we have consistently shown that all substrates promoted nitrate reduction, while glucose, ethanol, and acetate always promoted U reduction. Methanol only occasionally promoted extensive U reduction which is possibly due to community heterogeneity. There appeared to be limitations imposed on the community related to some substrates (e.g. methanol and pyruvate). Membrane lipid analyses (phospholipids and respiratory quinones) indicated different communities depending on electron donor used. Terminal restriction fragment length polymorphism and clone libraries indicated distinct differences among communities even in treatments that promoted U reduction. Thus, there was enough metabolic diversity to accommodate many different electron donors resulting in the U bioimmobilization.

Susan Pfiffner

2010-06-28T23:59:59.000Z

258

Atomic Calligraphy: The Direct Writing of Nanoscale Structures using MEMS  

E-Print Network [OSTI]

We present a micro-electromechanical system (MEMS) based method for the resist free patterning of nano-structures. Using a focused ion beam (FIB) to customize larger MEMS machines, we fabricate apertures as small as 50 nm on plates that can be moved with nanometer precision over an area greater than 20x20 {\\mu}m^2. Depositing thermally evaporated gold atoms though the apertures while moving the plate results in the deposition of nanoscale metal patterns. Adding a shutter only microns above the aperture, enables high speed control of not only where but also when atoms are deposited. Using a shutter, different sized apertures can be selectively opened and closed for nano-structure fabrication with features ranging from nano- to micrometers in scale. The ability to evaporate materials with high precision, and thereby fabricate circuits and structures in situ, enables new kinds of experiments based on the interactions of a small number of atoms and eventually even single atoms.

Matthias Imboden; Han Han; Jackson Chang; Flavio Pardo; Cristian A. Bolle; Evan Lowell; David J. Bishop

2013-04-04T23:59:59.000Z

259

MOX Fabrication Isolation Considerations  

SciTech Connect (OSTI)

This document provides a technical position on the preferred level of isolation to fabricate demonstration quantities of mixed oxide transmutation fuels. The Advanced Fuel Cycle Initiative should design and construct automated glovebox fabrication lines for this purpose. This level of isolation adequately protects the health and safety of workers and the general public for all mixed oxide (and other transmutation fuel) manufacturing efforts while retaining flexibility, allowing parallel development and setup, and minimizing capital expense. The basis regulations, issues, and advantages/disadvantages of five potential forms of isolation are summarized here as justification for selection of the preferred technical position.

Eric L. Shaber; Bradley J Schrader

2005-08-01T23:59:59.000Z

260

Covering Walls With Fabrics.  

E-Print Network [OSTI]

the glue a dull surface to adhere to. Fill any gouges or nail holes with patching plaster and sand smooth after they have dried thoroughly. Minor ripples can be covered with spackling compound, a plaster-like substance that is spread thinly... during dry weather and in a well-ventilated room. Cut each panel 3 inches longer than the ceiling height. Match and cut sufficient fabric widths to cover completely one wall at a time. Start with Corner I nstall the first fabric panel so...

Anonymous,

1979-01-01T23:59:59.000Z

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


261

Electrical characteristics of the CdTe-n-CdHgTe structure fabricated in a single molecular-beam epitaxy process  

SciTech Connect (OSTI)

An extraordinary shape of the capacitance-voltage characteristics of CdTe-CdHgTe structures has been detected; these characteristics include a specific 'hump' in the inversion region, the height of which increased severalfold under illumination. Additional measurements using an optical probe, measurements of current-voltage characteristics, and an analysis of the energy-band diagram of the structure showed the following. CdTe, in contrast to CdHgTe, is a p-type semiconductor with an acceptor concentration of 1 x 10{sup 16} cm{sup -3}; there is a hole inversion layer in CdHgTe at the boundary with CdTe, which causes the 'hump'; and the barrier height for holes at the CdTe-Cd{sub 0.43}Hg{sub 0.57}Te interface was determined as 0.13 eV.

Mashukov, Yu. P., E-mail: dr_mashukov@mail.ru; Mikhailov, N. N.; Vasilyev, V. V. [Russian Academy of Sciences, Rzhanov Institute of Semiconductor Physics, Siberian Branch (Russian Federation)

2010-09-15T23:59:59.000Z

262

Geometric and electronic properties of Cs structures on III-V (110) surfaces: From 1D and 2D insulators to 3D metals  

Science Journals Connector (OSTI)

We report the structural and electronic properties of Cs adsorbed on room-temperature GaAs and InSb (110) surfaces as observed with scanning tunneling microscopy. Cs initially forms long one-dimensional (1D) zigzag chains on both surfaces. Additional Cs adsorption on GaAs(110) results in the formation of a 2D overlayer consisting of five-atom Cs polygons arranged in c(44) superlattice. The tunneling gap measured over these insulating structures narrows with the transition from 1D to 2D, with metallic characteristics observed following saturation with a second Cs overlayer.

L. J. Whitman; Joseph A. Stroscio; R. A. Dragoset; R. J. Celotta

1991-03-11T23:59:59.000Z

263

Structure, adhesion, and stability of metal/oxide and oxide/oxide interfaces. Technical progress report, August 1, 1992--July 31, 1993  

SciTech Connect (OSTI)

Studies of structural, electronic, and chemical properties of metal/oxide and oxide/oxide interfaces were performed on well-defined interfaces that created by depositing ultra-thin potassium and aluminum films and their oxides onto single crystal TiO{sub 2} and NiO surfaces. Work focused on determining the structure, growth mechanisms, and morphologies of metal and oxide films as they are deposited an single crystal oxide surfaces using RHEED and atomic force microscopy probing electronic structure, bonding and chemical interactions at the interfaces using x-ray and uv photoelectron spectroscopies (XPS, UPS) and Auger electron spectroscopy (AES), and understanding factors affecting stability and reactivity of the interface regions including the role of defects and impurities. Results indicate that kinetic effects have an important influence on interface structure and composition, and they also show that defects in the oxide substrate induce new electronic states at the interface which play a major role in cation-anion bonding and interface interactions. The results establish a link between electronic and chemical bonding properties and the interface structure and morphology, which is required to successfully manipulate the interfacial properties of advanced ceramic materials.

Lad, R.J.

1992-11-01T23:59:59.000Z

264

Synthesis, Characterization and Crystal Structures of Some Linked Metal Carbonyl Clusters Derived from Diethynyl-Substituted Silane and Disilane Ligands  

Science Journals Connector (OSTI)

Starting with some alkynylsilane-type ligands, a new family of homonuclear metal carbonyl cluster complexes of cobalt, ruthenium and osmium were prepared and spectroscopically characterized. The present work demo...

Chun-Kin Wong; Guo-Liang Lu; Cheuk-Lam Ho; Wai-Yeung Wong

2010-09-01T23:59:59.000Z

265

Improved hydrogen storage capacity by hydrogen spillover and fine structural characterization of MIL-100 metal organic frameworks  

Science Journals Connector (OSTI)

The MIL-100 metal organic framework was synthesized through solvothermal route, modified with Pt-loaded active carbon and H2 adsorption capacity was evaluated. The maximum specific surface area of MIL-100 was obt...

Abhijit Krishna Adhikari; Kuen-Song Lin

2014-11-01T23:59:59.000Z

266

Epoxy bond and stop etch fabrication method  

DOE Patents [OSTI]

A class of epoxy bond and stop etch (EBASE) microelectronic fabrication techniques is disclosed. The essence of such techniques is to grow circuit components on top of a stop etch layer grown on a first substrate. The first substrate and a host substrate are then bonded together so that the circuit components are attached to the host substrate by the bonding agent. The first substrate is then removed, e.g., by a chemical or physical etching process to which the stop etch layer is resistant. EBASE fabrication methods allow access to regions of a device structure which are usually blocked by the presence of a substrate, and are of particular utility in the fabrication of ultrafast electronic and optoelectronic devices and circuits.

Simmons, Jerry A. (Sandia Park, NM); Weckwerth, Mark V. (Pleasanton, CA); Baca, Wes E. (Albuquerque, NM)

2000-01-01T23:59:59.000Z

267

Template-based Ferromagnetic Nanowires and Nanotubes: Fabrication and Characterization  

E-Print Network [OSTI]

This dissertation describes experimental studies of the structures and properties, and their correlations in ferromagnetic nanowires and nanotubes fabricated using porous templates. Ferromagnetic Ni and Fe nanowires with diameters 30 ~ 250 nm were...

Wei, Zhiyuan

2013-05-01T23:59:59.000Z

268

Method of producing catalytic materials for fabricating nanostructures  

DOE Patents [OSTI]

Methods of fabricating nano-catalysts are described. In some embodiments the nano-catalyst is formed from a powder-based substrate material and is some embodiments the nano-catalyst is formed from a solid-based substrate material. In some embodiments the substrate material may include metal, ceramic, or silicon or another metalloid. The nano-catalysts typically have metal nanoparticles disposed adjacent the surface of the substrate material. The methods typically include functionalizing the surface of the substrate material with a chelating agent, such as a chemical having dissociated carboxyl functional groups (--COO), that provides an enhanced affinity for metal ions. The functionalized substrate surface may then be exposed to a chemical solution that contains metal ions. The metal ions are then bound to the substrate material and may then be reduced, such as by a stream of gas that includes hydrogen, to form metal nanoparticles adjacent the surface of the substrate.

Seals, Roland D; Menchhofer, Paul A; Howe, Jane Y; Wang, Wei

2013-02-19T23:59:59.000Z

269

Thin film lithium-based batteries and electrochromic devices fabricated with nanocomposite electrode materials  

DOE Patents [OSTI]

Thin-film lithium-based batteries and electrochromic devices (10) are fabricated with positive electrodes (12) comprising a nanocomposite material composed of lithiated metal oxide nanoparticles (40) dispersed in a matrix composed of lithium tungsten oxide.

Gillaspie, Dane T; Lee, Se-Hee; Tracy, C. Edwin; Pitts, John Roland

2014-02-04T23:59:59.000Z

270

Fabrication process for openable microfluidic devices and externally actuated microfluidic switch  

E-Print Network [OSTI]

In this document I discuss the fabrication of metallic, aluminum and aluminum oxide, 3D micro channels, made with standard milling technology, along with two channel closing methods for openable devices: half cured-glued ...

Cartas Ayala, Marco Aurelio

2008-01-01T23:59:59.000Z

271

EELE408 Photovoltaics Lecture 16: Silicon Solar Cell Fabrication Techniques  

E-Print Network [OSTI]

;3 Screen Printed Solar Cells · Firing the contacts ­ The furnace heats the cell to a high temperature & Metal Closeup 14 Front and Back of Screen Printed Solar Cell 15 Crystallization Furnace for Ingot1 EELE408 Photovoltaics Lecture 16: Silicon Solar Cell Fabrication Techniques Dr. Todd J. Kaiser

Kaiser, Todd J.

272

Fabrication of Molecular Devices  

E-Print Network [OSTI]

This project focuses on the synthesis and attachment of metal nanoparticles to Au and GaAs surfaces using a combination of chemical self-assembly and scanned probe lithography. In this project self-assembled monolayers (SAMs) of alkanethiols...

Walton, Katherine

2011-08-04T23:59:59.000Z

273

Crystal and molecular structure of a dinuclear ortho-metalated platinum ylid complex, cyclo-[Pt(.mu.-Cl)(MeCO)CHP(C6H4-o)Ph2]2.2CDCl3  

Science Journals Connector (OSTI)

Crystal and molecular structure of a dinuclear ortho-metalated platinum ylid complex, cyclo-[Pt(.mu.-Cl)(MeCO)CHP(C6H4-o)Ph2]2.2CDCl3 ...

Marvin L. Illingsworth; John A. Teagle; John L. Burmeister; William C. Fultz; Arnold L. Rheingold

1983-10-01T23:59:59.000Z

274

Anchored nanostructure materials and method of fabrication  

DOE Patents [OSTI]

Anchored nanostructure materials and methods for their fabrication are described. The anchored nanostructure materials may utilize nano-catalysts that include powder-based or solid-based support materials. The support material may comprise metal, such as NiAl, ceramic, a cermet, or silicon or other metalloid. Typically, nanoparticles are disposed adjacent a surface of the support material. Nanostructures may be formed as anchored to nanoparticles that are adjacent the surface of the support material by heating the nano-catalysts and then exposing the nano-catalysts to an organic vapor. The nanostructures are typically single wall or multi-wall carbon nanotubes.

Seals, Roland D; Menchhofer, Paul A; Howe, Jane Y; Wang, Wei

2012-11-27T23:59:59.000Z

275

Fabrication of faceted nanopores in magnesium  

SciTech Connect (OSTI)

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

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

2013-12-09T23:59:59.000Z

276

Fabrication of 5 nm linewidth and 14 nm pitch features by nanoimprint lithography  

E-Print Network [OSTI]

Fabrication of 5 nm linewidth and 14 nm pitch features by nanoimprint lithography Michael D. Austin pitch and feature sizes of these applications. Thus, presently, re- searchers have been largely pitch over a large area, its applications in nanogap metal contacts, and a study of fabrication yields

277

Single-molecule transistor fabrication by self-aligned lithography and in situ molecular assembly  

E-Print Network [OSTI]

Single-molecule transistor fabrication by self-aligned lithography and in situ molecular assembly J of single-molecule transistors by self-aligned lithography and in situ molecular assembly. Ultrathin metal fabrication of electrodes that can be bridged by a single molecule remains a significant challenge

Hone, James

278

Photonic crystal membrane reflectors by magnetic field-guided metal-assisted chemical etching  

SciTech Connect (OSTI)

Metal-assisted chemical etching (MacEtch) is a simple etching method that uses metal as the catalyst for anisotropic etching of semiconductors. However, producing nano-structures using MacEtch from discrete metal patterns, in contrast to interconnected ones, has been challenging because of the difficulties in keeping the discrete metal features in close contact with the semiconductor. We report the use of magnetic field-guided MacEtch (h-MacEtch) to fabricate periodic nanohole arrays in silicon-on-insulator (SOI) wafers for high reflectance photonic crystal membrane reflectors. This study demonstrates that h-MacEtch can be used in place of conventional dry etching to produce ordered nanohole arrays for photonic devices.

Balasundaram, Karthik; Mohseni, Parsian K.; Li, Xiuling, E-mail: wzhou@uta.edu, E-mail: xiuling@illinois.edu [Micro and Nanotechnology Laboratory, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)] [Micro and Nanotechnology Laboratory, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States); Shuai, Yi-Chen; Zhao, Deyin; Zhou, Weidong, E-mail: wzhou@uta.edu, E-mail: xiuling@illinois.edu [Department of Electrical Engineering, NanoFAB Center, University of Texas at Arlington, Arlington, Texas 76019 (United States)] [Department of Electrical Engineering, NanoFAB Center, University of Texas at Arlington, Arlington, Texas 76019 (United States)

2013-11-18T23:59:59.000Z

279

High-resolution electron-energy-loss spectroscopy and photoelectron-diffraction studies of the geometric structure of adsorbates on single-crystal metal surfaces  

SciTech Connect (OSTI)

Two techniques which have made important contributions to the understanding of surface phenomena are high resolution electron energy loss spectroscopy (EELS) and photoelectron diffraction (PD). EELS is capable of directly measuring the vibrational modes of clean and adsorbate covered metal surfaces. In this work, the design, construction, and performance of a new EELS spectrometer are described. These results are discussed in terms of possible structures of the O-Cu(001) system. Recommendations for improvements in this EELS spectrometer and guidelines for future spectrometers are given. PD experiments provide accurate quantitative information about the geometry of atoms and molecules adsorbed on metal surfaces. The technique has advantages when used to study disordered overlayers, molecular overlayers, multiple site systems, and adsorbates which are weak electron scatterers. Four experiments were carried out which exploit these advantages.

Rosenblatt, D.H.

1982-11-01T23:59:59.000Z

280

From electronic structure to catalytic activity: A single descriptor for adsorption and reactivity on transition-metal carbides  

E-Print Network [OSTI]

Adsorption and catalytic properties of the polar (111) surface of transition-metal carbides (TMC's) are investigated by density-functional theory. Atomic and molecular adsorption are rationalized with the concerted-coupling model, in which two types of TMC surface resonances (SR's) play key roles. The transition-metal derived SR is found to be a single measurable descriptor for the adsorption processes, implying that the Br{\\o}nsted-Evans-Polanyi relation and scaling relations apply. This gives a picture with implications for ligand and vacancy effects and which has a potential for a broad screening procedure for heterogeneous catalysts.

Vojvodic, Aleksandra; Ruberto, Carlo; Lundqvist, Bengt I

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" 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

Strengthening porous metal skeletons by metal deposition from a nanoparticle dispersion  

E-Print Network [OSTI]

The accuracy of solid freeform fabrication processes such as three-dimensional printing (3DP) and selective laser sintering (SLS) must be improved for them to achieve wide application in direct production of metal parts. ...

Crane, Nathan B., 1974-

2005-01-01T23:59:59.000Z

282

Electrospun and oxidized cellulose materials for environmental remediation of heavy metals in groundwater  

SciTech Connect (OSTI)

This chapter focuses on the use of modified cellulosic materials in the field of environmental remediation. Two different chemical methods were involved in fabricating oxidized cellulose (OC), which has shown promise as a metal ion chelator in environmental applications. Electrospinning was utilized to introduce a more porous structure into an oxidized cellulose matrix. FTIR and Raman spectroscopy were used to study both the formation of OC and its surface complexation with metal ions. IR and Raman spectroscopic data demonstrate the formation of characteristic carboxylic groups in the structure of the final products and the successful formation of OC-metal complexes. Subsequent field tests at the Field Research Site at Oak Ridge National Laboratory confirmed the value of OC for sorption of both U and Th ions.

Han, Dong [Stony Brook University (SUNY); Halada, Gary P. [Stony Brook University (SUNY); Spalding, Brian Patrick [ORNL; Brooks, Scott C [ORNL

2009-12-01T23:59:59.000Z

283

Materials for freeform fabrication of GHz tunable dielectric photonic crystals.  

SciTech Connect (OSTI)

Photonic crystals are of interest for GHz transmission applications, including rapid switching, GHz filters, and phased-array technology. 3D fabrication by Robocasting enables moldless printing of high solid loading slurries into structures such as the ''woodpile'' structures used to fabricate dielectric photonic band gap crystals. In this work, tunable dielectric materials were developed and printed into woodpile structures via solid freeform fabrication (SFF) toward demonstration of tunable photonic crystals. Barium strontium titanate ceramics possess interesting electrical properties including high permittivity, low loss, and high tunability. This paper discusses the processing route and dielectric characterization of (BaxSr1-XTiO3):MgO ceramic composites, toward fabrication of tunable dielectric photonic band gap crystals.

Niehaus, Michael Keith; Lewis, Jennifer A. (University of Illinois, Urbana, IL); Smay, James Earl; Clem, Paul Gilbert; Lin, Shawn-Yu; Cesarano, Joseph, III (,; ); Carroll, James F.

2003-01-01T23:59:59.000Z

284

Stabilization of Electrocatalytic Metal Nanoparticles at Metal...  

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

Electrocatalytic Metal Nanoparticles at Metal-Metal Oxide-Graphene Triple Junction Points. Stabilization of Electrocatalytic Metal Nanoparticles at Metal-Metal Oxide-Graphene...

285

Liquid metal thermal electric converter  

DOE Patents [OSTI]

A liquid metal thermal electric converter which converts heat energy to electrical energy. The design of the liquid metal thermal electric converter incorporates a unique configuration which directs the metal fluid pressure to the outside of the tube which results in the structural loads in the tube to be compressive. A liquid metal thermal electric converter refluxing boiler with series connection of tubes and a multiple cell liquid metal thermal electric converter are also provided.

Abbin, Joseph P. (Albuquerque, NM); Andraka, Charles E. (Albuquerque, NM); Lukens, Laurance L. (Albuquerque, NM); Moreno, James B. (Albuquerque, NM)

1989-01-01T23:59:59.000Z

286

First-principles study of the stability and electronic structure of metal hydrides H. Smithson,1,2  

E-Print Network [OSTI]

energy is the chemical bonding between the hydrogen and metal in which it is inserted. This is the only number s : 61.50.Ah, 61.66.Dk I. INTRODUCTION The absorption of hydrogen in materials is of wide to as hydro- gen embrittlement. The mechanism of such embrittlement is believed to be different depending

Ceder, Gerbrand

287

PHYSICAL REVIEW B 85, 085425 (2012) Influence of water on the electronic structure of metal-supported graphene  

E-Print Network [OSTI]

-supported graphene: Insights from van der Waals density functional theory Xiao Li ( ),1 Ji Feng ( ),1,* Enge Wang-supported graphene through van der Waals density functional theory calculations. Our results show a systematic increase in the adsorption energy of water on graphene in the presence of underlying metal substrates

Alavi, Ali

288

Carbon Nanotubes Based Nanoelectrode Arrays: Fabrication, Evaluation...  

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

Arrays: Fabrication, Evaluation and Application in Voltammetric Analysis. Carbon Nanotubes Based Nanoelectrode Arrays: Fabrication, Evaluation and Application in Voltammetric...

289

Nano-fabricated superconducting radio-frequency composites, method for producing nano-fabricated superconducting rf composites  

DOE Patents [OSTI]

Superconducting rf is limited by a wide range of failure mechanisms inherent in the typical manufacture methods. This invention provides a method for fabricating superconducting rf structures comprising coating the structures with single atomic-layer thick films of alternating chemical composition. Also provided is a cavity defining the invented laminate structure.

Norem, James H.; Pellin, Michael J.

2013-06-11T23:59:59.000Z

290

Status of Transuranic Bearing Metallic Fuel Development  

SciTech Connect (OSTI)

This paper summarizes the status of the metallic fuel development under the Advanced Fuel Cycle Initiative (AFCI). The metallic fuel development program includes fuel fabrication, characterization, advanced cladding research, irradiation testing and post-irradiation examination (PIE). The focus of this paper is on the recent irradiation experiments conducted in the Advanced Test Reactor and some PIE results from these tests.

Steve Hayes; Bruce Hilton; Heather MacLean; Debbie Utterbeck; Jon Carmack; Kemal Pasamehmetoglu

2009-09-01T23:59:59.000Z

291

Intraocular lens fabrication  

DOE Patents [OSTI]

This invention describes a method for fabricating an intraocular lens made from clear Teflon{trademark}, Mylar{trademark}, or other thermoplastic material having a thickness of about 0.025 millimeters. These plastic materials are thermoformable and biocompatable with the human eye. The two shaped lenses are bonded together with a variety of procedures which may include thermosetting and solvent based adhesives, laser and impulse welding, and ultrasonic bonding. The fill tube, which is used to inject a refractive filling material is formed with the lens so as not to damage the lens shape. A hypodermic tube may be included inside the fill tube. 13 figs.

Salazar, M.A.; Foreman, L.R.

1997-07-08T23:59:59.000Z

292

Intraocular lens fabrication  

DOE Patents [OSTI]

This invention describes a method for fabricating an intraocular lens made rom clear Teflon.TM., Mylar.TM., or other thermoplastic material having a thickness of about 0.025 millimeters. These plastic materials are thermoformable and biocompatable with the human eye. The two shaped lenses are bonded together with a variety of procedures which may include thermosetting and solvent based adhesives, laser and impulse welding, and ultrasonic bonding. The fill tube, which is used to inject a refractive filling material is formed with the lens so as not to damage the lens shape. A hypodermic tube may be included inside the fill tube.

Salazar, Mike A. (Albuquerque, NM); Foreman, Larry R. (Los Alamos, NM)

1997-01-01T23:59:59.000Z

293

Advanced Safeguards Approaches for New TRU Fuel Fabrication Facilities  

SciTech Connect (OSTI)

This second report in a series of three reviews possible safeguards approaches for the new transuranic (TRU) fuel fabrication processes to be deployed at AFCF specifically, the ceramic TRU (MOX) fuel fabrication line and the metallic (pyroprocessing) line. The most common TRU fuel has been fuel composed of mixed plutonium and uranium dioxide, referred to as MOX. However, under the Advanced Fuel Cycle projects custom-made fuels with higher contents of neptunium, americium, and curium may also be produced to evaluate if these minor actinides can be effectively burned and transmuted through irradiation in the ABR. A third and final report in this series will evaluate and review the advanced safeguards approach options for the ABR. In reviewing and developing the advanced safeguards approach for the new TRU fuel fabrication processes envisioned for AFCF, the existing international (IAEA) safeguards approach at the Plutonium Fuel Production Facility (PFPF) and the conceptual approach planned for the new J-MOX facility in Japan have been considered as a starting point of reference. The pyro-metallurgical reprocessing and fuel fabrication process at EBR-II near Idaho Falls also provided insight for safeguarding the additional metallic pyroprocessing fuel fabrication line planned for AFCF.

Durst, Philip C.; Ehinger, Michael H.; Boyer, Brian; Therios, Ike; Bean, Robert; Dougan, A.; Tolk, K.

2007-12-15T23:59:59.000Z

294

Maximal light-energy transfer through a dielectric/metal-layered electrode on a photoactive device  

Science Journals Connector (OSTI)

We report the fabrication of an optimized low reflective dielectric/metal-layered electrode that provides significant electrical conductivity and light transparency in the...

Kim, Kyoung-Ho; Park, Q-Han

2014-01-01T23:59:59.000Z

295

3D Assembly of Semiconductor and Metal Nanocrystals: Hybrid CdTe/Au Structures with Controlled Content  

Science Journals Connector (OSTI)

(3) Recently, attention was attracted by the possibility to create functional gels and aerogels via self-assembly of colloidal NCs(4) or clusters of metal chalcogenides,(5) which may open enormous opportunities for semiconductor technology, catalysis and photocatalysis, optoelectronics and photonics, sorbents and filters. ... A critical point drier (13200J-AB from Spi Supplies) was used for supercritical CO2 drying to prevent the fine nanostructures from collapsing and to obtain self-supporting aerogel monoliths. ...

Vladimir Lesnyak; Andr Wolf; Aliaksei Dubavik; Lars Borchardt; Sergei V. Voitekhovich; Nikolai Gaponik; Stefan Kaskel; Alexander Eychmller

2011-07-21T23:59:59.000Z

296

Metallization of fluid hydrogen  

Science Journals Connector (OSTI)

...P. Tunstall Metallization of fluid hydrogen W. J. Nellis 1 A. A. Louis 2 N...The electrical resistivity of liquid hydrogen has been measured at the high dynamic...which structural changes are paramount. hydrogen|metallization of hydrogen|liquid...

1998-01-01T23:59:59.000Z

297

Fabrication of dual porosity electrode structure  

DOE Patents [OSTI]

A substantially entirely fibrous ceramic which may have dual porosity of both micro and macro pores. Total porosity may be 60-75% by volume. A method of spraying a slurry perpendicularly to an ambient stream of air is disclosed along with a method of removing binders without altering the fiber morphology. Adding fine ceramic particulates to the green ceramic fibers enhances the sintering characteristics of the fibers.

Smith, James L. (Lemont, IL); Kucera, Eugenia H. (Downers Grove, IL)

1991-01-01T23:59:59.000Z

298

Fabrication of dual porosity electrode structure  

DOE Patents [OSTI]

A substantially entirely fibrous ceramic is described which may have dual porosity of both micro and macro pores. Total porosity may be 60-75% by volume. A method of spraying a slurry perpendicularly to an ambient stream of air is disclosed along with a method of removing binders without altering the fiber morphology. Adding fine ceramic particulates to the green ceramic fibers enhances the sintering characteristics of the fibers. 3 figures.

Smith, J.L.; Kucera, E.H.

1991-02-12T23:59:59.000Z

299

The structures and dynamics of atomic and molecular adsorbates on metal surfaces by scanning tunneling microscopy and low energy electron diffraction  

SciTech Connect (OSTI)

Studies of surface structure and dynamics of atoms and molecules on metal surfaces are presented. My research has focused on understanding the nature of adsorbate-adsorbate and adsorbate-substrate interactions through surface studies of coverage dependency and coadsorption using both scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). The effect of adsorbate coverage on the surface structures of sulfur on Pt(111) and Rh(111) was examined. On Pt(111), sulfur forms p(2x2) at 0.25 ML of sulfur, which transforms into a more compressed ({radical}3x{radical}3)R30{degrees} at 0.33 ML. On both structures, it was found that sulfur adsorbs only in fcc sites. When the coverage of sulfur exceeds 0.33 ML, it formed more complex c({radical}3x7)rect structure with 3 sulfur atoms per unit cell. In this structure, two different adsorption sites for sulfur atoms were observed - two on fcc sites and one on hcp site within the unit cell.

Yoon, Hyungsuk Alexander

1996-12-01T23:59:59.000Z

300

Metals and Ceramics Division. Annual progress report, ending June 30, 1980  

SciTech Connect (OSTI)

Research is reported concerning: (1) engineering materials, including materials compatibility, mechanical properties, nondestructive testing, pressure vessel technology, and welding and brazing; (2) fuels and processes consisting of ceramic technology, fuel cycle technology, fuels evaluation, fuel fabrication and metals processing; and (3) materials science which includes, ceramic studies, physical metallurgy properties, radiation effects and microstructural analysis, metastable and superconducting materials, structure and properties of surfaces, theroretical research and x-ray research and applications. Highlights of the work of the metallographic group and the current state of the High-Temperature Materials Laboratory (HTML) and the Materials and Structures Technology Management Center (MSTMC) are presented. (FS)

Not Available

1980-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" 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

Fabrication Flaws in Reactor Pressure Vessel Repair Welds  

SciTech Connect (OSTI)

This paper describes the fabrication flaw distribution and characterization in the repair weld metal of reactor pressure vessels. This work indicates that the large flaws occur in these repairs. These results show that repair flaws are complex in composition and sometimes include cracks on the repair ends. Parametric analysis using an exponential fit is performed on the data. A description of repair flaw morphology is provided. Fabrication flaws in repairs are characterized using high sensitivity nondestructive ultrasonic testing, validation by other nondestructive evaluation (NDE) techniques, and complemented by destructive testing.

Schuster, George J.; Doctor, Steven R.

2007-12-01T23:59:59.000Z

302

Metal Aminoboranes  

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

Metal Aminoboranes Metal Aminoboranes Metal Aminoboranes Metal aminoboranes of the formula M(NH.sub.2BH.sub.3).sub.n have been synthesized. June 25, 2013 Metal Aminoboranes Metal aminoboranes of the formula M(NH.sub.2BH.sub.3).sub.n have been synthesized. Available for thumbnail of Feynman Center (505) 665-9090 Email Metal Aminoboranes Metal aminoboranes of the formula M(NH.sub.2BH.sub.3).sub.n have been synthesized. Metal aminoboranes are hydrogen storage materials. Metal aminoboranes are also precursors for synthesizing other metal aminoboranes. Metal aminoboranes can be dehydrogenated to form hydrogen and a reaction product. The reaction product can react with hydrogen to form a hydrogen storage material. Metal aminoboranes can be included in a kit. U.S. Patent No.: 7,713,506 (DOE S-112,798)

303

Uranium and other heavy metals in the plant-animal-human food chain near abandoned mining sites and structures in an American Indian community in northwestern New Mexico  

E-Print Network [OSTI]

agent (U and other heavy metal toxicants). The environmentM=6.59, SD=3.87). The heavy metal toxicity levels for sheepFor Sheep 1, heavy metal water toxicity levels were not

Samuel-Nakamura, Christine

2013-01-01T23:59:59.000Z

304

Early Transition Metal Complexes Containing 1,2,4-Triazolato and Tetrazolato Ligands: Synthesis, Structure, and Molecular Orbital Studies  

E-Print Network [OSTI]

or potassium salts derived from 1,2,4-triazoles and tetrazoles. The X-ray structure analysis of Ti(tBu2pz)2(Me2

Schlegel, H. Bernhard

305

Density of states of a semi-infinite rare-earth metal with magnetic structure: A simple model  

Science Journals Connector (OSTI)

Using a simple tight-binding model and the transfer matrix approach, we have calculated the spectral density of states (SDOS) of a rare-earth metal in the presence of a surface for different magnetic arrangements (such as ferromagnetic, antiferromagnetic, and conical orderings). The local density of states (LDOS) has also been calculated for some examples, integrating the SDOS over the Brillouin zone. The main effect observed deals with the absence of Van Hove's singularities in the surface LDOS, a fact that appears to be an intrinsic property of the surface. Finally the relaxation of the overlap parameters at the surface is discussed and some numerical examples are shown.

Bernardo Laks and G. G. Cabrera

1979-09-15T23:59:59.000Z

306

Structure of the Alkali-metal-atom-Strontium molecular ions: towards photoassociation and formation of cold molecular ions  

E-Print Network [OSTI]

The potential energy curves, permanent and transition dipole moments, and the static dipolar polarizability, of molecular ions composed of one alkali-metal atom and a Strontium ion are determined with a quantum chemistry approach. The molecular ions are treated as effective two-electron systems and are treated using effective core potentials including core polarization, large gaussian basis sets, and full configuration interaction. In the perspective of upcoming experiments aiming at merging cold atom and cold ion traps, possible paths for radiative charge exchange, photoassociation of a cold Lithium or Rubidium atom and a Strontium ion are discussed, as well as the formation of stable molecular ions.

Mireille Aymar; Romain Gurout; Olivier Dulieu

2011-02-24T23:59:59.000Z

307

Structure of the alkali-metal-atom + strontium molecular ions: Towards photoassociation and formation of cold molecular ions  

SciTech Connect (OSTI)

The potential energy curves, permanent and transition dipole moments, and the static dipolar polarizability, of molecular ions composed of one alkali-metal atom and a strontium ion are determined with a quantum chemistry approach. The molecular ions are treated as effective two-electron systems and are treated using effective core potentials including core polarization, large gaussian basis sets, and full configuration interaction. In the perspective of upcoming experiments aiming at merging cold atom and cold ion traps, possible paths for radiative charge exchange, photoassociation of a cold lithium or rubidium atom and a strontium ion are discussed, as well as the formation of stable molecular ions.

Aymar, M.; Dulieu, O. [Laboratoire Aime Cotton, CNRS, UPR3321, Ba circumflex t. 505, Univ Paris-Sud, 91405 Orsay Cedex (France); Guerout, R. [Laboratoire Kastler-Brossel, CNRS, ENS, Univ Pierre et Marie Curie case 74, Campus Jussieu, F-75252 Paris Cedex 05 (France)

2011-08-14T23:59:59.000Z

308

Structure of the Alkali-metal-atom-Strontium molecular ions: towards photoassociation and formation of cold molecular ions  

E-Print Network [OSTI]

The potential energy curves, permanent and transition dipole moments, and the static dipolar polarizability, of molecular ions composed of one alkali-metal atom and a Strontium ion are determined with a quantum chemistry approach. The molecular ions are treated as effective two-electron systems and are treated using effective core potentials including core polarization, large gaussian basis sets, and full configuration interaction. In the perspective of upcoming experiments aiming at merging cold atom and cold ion traps, possible paths for radiative charge exchange, photoassociation of a cold Lithium or Rubidium atom and a Strontium ion are discussed, as well as the formation of stable molecular ions.

Aymar, Mireille; Dulieu, Olivier

2011-01-01T23:59:59.000Z

309

Photoactivated metal removal  

SciTech Connect (OSTI)

The authors propose the use of photochromic dyes as light activated switches to bind and release metal ions. This process, which can be driven by solar energy, can be used in environmental and industrial processes to remove metals from organic and aqueous solutions. Because the metals can be released from the ligands when irradiated with visible light, regeneration of the ligands and concentration of the metals may be easier than with conventional ion exchange resins. Thus, the process has the potential to be less expensive than currently used metal extraction techniques. In this paper, the authors report on their studies of the metal binding of spirogyran dyes and the hydrolytic stability of these dyes. They have prepared a number of spirogyrans and measured their binding constants for calcium and magnesium. They discuss the relationship of the structure of the dyes to their binding strengths. These studies are necessary towards determining the viability of this technique.

Nimlos, M.R.; Filley, J.; Ibrahim, M.A.; Watt, A.S.; Blake, D.M.

1999-07-01T23:59:59.000Z

310

Facile Fabrication of Free-Standing Light Emitting Diode by Combination of Wet Chemical Etchings  

Science Journals Connector (OSTI)

Facile Fabrication of Free-Standing Light Emitting Diode by Combination of Wet Chemical Etchings ... Free-standing GaN light-emitting diode (LED) structure with high crystalline quality was fabricated by combining electrochemical and photoelectrochemical etching followed by regrowth of LED structure and subsequent mechanical detachment from a substrate. ...

Lee-Woon Jang; Dae-Woo Jeon; Tae-Hoon Chung; Alexander Y. Polyakov; Han-Su Cho; Jin-Hyeon Yun; Jin-Woo Ju; Jong-Hyeob Baek; Joo-Won Choi; In-Hwan Lee

2013-12-25T23:59:59.000Z

311

Functional and Structural Characterization of Nanoparticulate Transition Metal Complexes Prepared Using Precipitation with Compressed Carbon Dioxide as an Antisolvent  

E-Print Network [OSTI]

with compressed antisolvent (PCA) technique. In situ X-ray absorption spectroscopy (EXAFS and XANES) in conjunction with quantitative microbalance techniques were employed to gain insight into the relationship between the structure and the gas binding ability...

Johnson, Chad Aaron

2008-04-29T23:59:59.000Z

312

Symmetry reduction of metal phthalocyanines on metals  

Science Journals Connector (OSTI)

The temperature-dependent adsorption behavior of fourfold symmetric metal phthalocyanines (MPcs) on metals with commensurate and incommensurate symmetries was investigated by scanning tunneling microscopy. On the fourfold symmetric Cu(100) surface, planar and fourfold molecular structures in two equivalent orientations were found for MPcs when prepared at room temperature. In addition, two metastable orientations were identified when prepared at low temperature, which can be depopulated upon annealing. MPcs adsorbed on the sixfold symmetric Cu(111) surface showed a disturbed molecular appearance. The symmetry of molecular structures changed from fourfold to twofold, which is discussed in terms of molecule-substrate interaction.

Shih-Hsin Chang; Stefan Kuck; Jens Brede; Leonid Lichtenstein; Germar Hoffmann; Roland Wiesendanger

2008-12-29T23:59:59.000Z

313

Temperature dependent junction capacitance-voltage characteristics of Ni embedded TiN/SiO{sub 2}/p-Si metalinsulatorsemiconductor structure  

SciTech Connect (OSTI)

This work presents the junction capacitancevoltage characteristics of highly textured/epitaxial Ni nanoparticle embedded in TiN matrix (TiN(Ni)) metal-insulator-semiconductor TiN(Ni)/SiO{sub 2}/p-Si (100) heterojunction in the temperature range of 10300?K. This heterojunction behaves as metal-semiconductor junction with unavoidable leakage through native oxide SiO{sub 2} layer. The clockwise hysteresis loop has been observed in the capacitance-voltage characteristics measured at various frequencies mainly due to presence of trap centers at the TiN(Ni)/SiO{sub 2} interface and these are temperature dependent. The spin-dependent trap charge effect at the interface influences the quadratic nature of the capacitance with magnetic field. The junction magnetocapacitance (JMC) is observed to be dependent on both temperature and frequency. The highest JMC of this heterojunction has been observed at 200?K at higher frequencies (100?kHz1?MHz). It is found that there is not much effect of band structure modification under magnetic field causing the JMC.

Panda, J.; Nath, T. K., E-mail: tnath@phy.iitkgp.ernet.in [Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302 (India); Chattopadhyay, S. [Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302 (India); Amity Institute of Nano Technology, Amity University, Sector-125, Noida, Uttar Pradesh 201313 (India)

2013-12-14T23:59:59.000Z

314

Novel Fabrication and Simple Hybridization of Exotic Material MEMS  

SciTech Connect (OSTI)

Work in materials other than silicon for MEMS applications has typically been restricted to metals and metal oxides instead of more ''exotic'' semiconductors. However, group III-V and II-VI semiconductors form a very important and versatile collection of material and electronic parameters available to the MEMS and MOEMS designer. With these materials, not only are the traditional mechanical material variables (thermal conductivity, thermal expansion, Young's modulus, etc.) available, but also chemical constituents can be varied in ternary and quaternary materials. This flexibility can be extremely important for both friction and chemical compatibility issues for MEMS. In addition, the ability to continually vary the bandgap energy can be particularly useful for many electronics and infrared detection applications. However, there are two major obstacles associated with alternate semiconductor material MEMS. The first issue is the actual fabrication of non-silicon devices and the second impediment is communicating with these novel devices. We will describe an essentially material independent fabrication method that is amenable to most group III-V and II-VI semiconductors. This technique uses a combination of non-traditional direct write precision fabrication processes such as diamond turning, ion milling, laser ablation, etc. This type of deterministic fabrication approach lends itself to an almost trivial assembly process. We will also describe in detail the mechanical, electrical, and optical self-aligning hybridization technique used for these alternate-material MEMS.

Datskos, P.G.; Rajic, S.

1999-11-13T23:59:59.000Z

315

Fabrication methods for low impedance lithium polymer electrodes  

DOE Patents [OSTI]

A process for fabricating an electrolyte-electrode composite suitable for high energy alkali metal battery that includes mixing composite electrode materials with excess liquid, such as ethylene carbonate or propylene carbonate, to produce an initial formulation, and forming a shaped electrode therefrom. The excess liquid is then removed from the electrode to compact the electrode composite which can be further compacted by compression. The resulting electrode exhibits at least a 75% lower resistance.

Chern, Terry Song-Hsing (Midlothian, VA); MacFadden, Kenneth Orville (Highland, MD); Johnson, Steven Lloyd (Arbutus, MD)

1997-01-01T23:59:59.000Z

316

Fabrication methods for low impedance lithium polymer electrodes  

DOE Patents [OSTI]

A process is described for fabricating an electrolyte-electrode composite suitable for high energy alkali metal battery that includes mixing composite electrode materials with excess liquid, such as ethylene carbonate or propylene carbonate, to produce an initial formulation, and forming a shaped electrode therefrom. The excess liquid is then removed from the electrode to compact the electrode composite which can be further compacted by compression. The resulting electrode exhibits at least a 75% lower resistance.

Chern, T.S.; MacFadden, K.O.; Johnson, S.L.

1997-12-16T23:59:59.000Z

317

Comments on Americium Volatilization during Fuel Fabrication for Fast Reactors  

SciTech Connect (OSTI)

The physical processes relevant to the fabrication of metallic and ceramic nuclear fuels are analyzed, with attention to recycling of fuels containing U, Pu, and minor volatile actinides for the use in fast reactors. This analysis is relevant to the development of a process model that can be used for the numerical simulation and prediction of the spatial distribution of composition in the fuel, an important factor in fuel performance.

Sabau, Adrian S [ORNL; Ohriner, Evan Keith [ORNL

2008-01-01T23:59:59.000Z

318

Structural and electronic properties of the quasi-one-dimensional metallic chains of the Au-induced facets on the Si(5 5 12) surface  

Science Journals Connector (OSTI)

We have investigated the atomic arrangements and electronic properties of the quasi-one-dimensional (Q1D) atomic chains of the Au-induced facets formed on the clean Si(5 5 12)-21 surface. The interchain distances of the two well ordered facet structures are estimated to be 30.2 and 22.8 . By utilizing linearly polarized synchrotron photons, we also determine a complete band diagram of the surface bands and their symmetry characteristics along the two high symmetry azimuths (?-M and ?-X) of the surface Brillouin zone. The Q1D nature of the Au-induced atomic chains has been well demonstrated by the extremely anisotropic band dispersions of the Au-induced surface bands in addition to the 21 surface morphology. We find that while the clean reconstructed Si(5 5 12)-21 surface is insulating, the Au-induced chains form a highly anisotropic metallic system.

S. S. Lee; N. D. Kim; C. G. Hwang; H. J. Song; J. W. Chung

2002-09-23T23:59:59.000Z

319

Fabrication of catalyzed ion transport membrane systems  

DOE Patents [OSTI]

Process for fabricating a catalyzed ion transport membrane (ITM). In one embodiment, an uncatalyzed ITM is (a) contacted with a non-reducing gaseous stream while heating to a temperature and for a time period sufficient to provide an ITM possessing anion mobility; (b) contacted with a reducing gaseous stream for a time period sufficient to provide an ITM having anion mobility and essentially constant oxygen stoichiometry; (c) cooled while contacting the ITM with the reducing gaseous stream to provide an ITM having essentially constant oxygen stoichiometry and no anion mobility; and (d) treated by applying catalyst to at least one of (1) a porous mixed conducting multicomponent metallic oxide (MCMO) layer contiguous with a first side of a dense layer of MCMO and (2) a second side of the dense MCMO layer. In another embodiment, these steps are carried out in the alternative order of (a), (d), (b), and (c).

Carolan, Michael Francis; Kibby, Charles Leonard

2013-06-04T23:59:59.000Z

320

WeldingFabr&MetalForm  

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

Welding, Welding, Fabrication, and Metal Forming Manufacturing Technologies The department consists of three trades: weld- ing; fabrication and assembly; and precision metal forming. These interrelated groups use similar equipment and rely on each other's skills. One stop will get you the service of three reliable trades. The team manufactures and assembles proto- type hardware and has the in-house capability of producing hardware with sizes ranging from thumbnail to rail-car. Expertise includes aircraft quality sheet metal construction, certified weld- ing, and assembly. The staff has experience managing a variety of activities: design modifi- cation assistance; in-house fabrication; and project management and can work with your engineers to transform sketches and ideas into working prototypes.

Note: This page contains sample records for the topic "fabricated structural metal" 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

Rapid Freeform Sheet Metal Forming Project Touted in the News  

Broader source: Energy.gov [DOE]

Fabricating and Forming Journal's April issue includes "Forming the Future," a feature story about AMO's Innovative Manufacturing Initiative (IMI) Project Rapid Freeform Sheet Metal Forming. This project, begun in 2013, involves Ford, Boeing, Northwestern University, Penn State, and MIT.

322

Schottky barrier MOSFET systems and fabrication thereof  

DOE Patents [OSTI]

(MOS) device systems-utilizing Schottky barrier source and drain to channel region junctions are disclosed. Experimentally derived results which demonstrate operation of fabricated N-channel and P-channel Schottky barrier (MOSFET) devices, and of fabricated single devices with operational characteristics similar to (CMOS) and to a non-latching (SRC) are reported. Use of essentially non-rectifying Schottky barriers in (MOS) structures involving highly doped and the like and intrinsic semiconductor to allow non-rectifying interconnection of, and electrical accessing of device regions is also disclosed. Insulator effected low leakage current device geometries and fabrication procedures therefore are taught. Selective electrical interconnection of drain to drain, source to drain, or source to source, of N-channel and/or P-channel Schottky barrier (MOSFET) devices formed on P-type, N-type and Intrinsic semiconductor allows realization of Schottky Barrier (CMOS), (MOSFET) with (MOSFET) load, balanced differential (MOSFET) device systems and inverting and non-inverting single devices with operating characteristics similar to (CMOS), which devices can be utilized in modulation, as well as in voltage controled switching and effecting a direction of rectification.

Welch, James D. (10328 Pinehurst Ave., Omaha, NE 68124)

1997-01-01T23:59:59.000Z

323

Micro-optic fabrication with subdomain masking  

Science Journals Connector (OSTI)

An innovative fabrication technique is introduced that is based on multiple-exposure techniques for micro-optics fabrication. This approach is compatible with conventional lithography...

Pitchumani, Mahesh; Brown, Jeremiah; Mohammed, Waleed; Johnson, Eric G

2004-01-01T23:59:59.000Z

324

Enforcement Letter, Parsons Technology Development & Fabrication...  

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

Technology Development & Fabrication Complex - April 13, 2010 Enforcement Letter, Parsons Technology Development & Fabrication Complex - April 13, 2010 April 13, 2010 Issued to...

325

The Reactivity and Structural Dynamics of Supported Metal Nanoclusters Using Electron Microscopy, in situ X-Ray Spectroscopy, Electronic Structure Theories, and Molecular Dynamics Simulations.  

SciTech Connect (OSTI)

The distinguishing feature of our collaborative program of study is the focus it brings to emergent phenomena originating from the unique structural/electronic environments found in nanoscale materials. We exploit and develop frontier methods of atomic-scale materials characterization based on electron microscopy (Yang) and synchrotron X-ray absorption spectroscopy (Frenkel) that are in turn coupled innately with advanced first principles theory and methods of computational modeling (Johnson). In the past year we have made significant experimental advances that have led to important new understandings of the structural dynamics of what are unquestionably the most important classes of heterogeneous catalyststhe materials used to both produce and mitigate the consequences of the use of liquid hydrocarbon fuels.

Judith C. Yang; Ralph G. Nuzzo, Duane Johnson, Anatoly Frenkel

2008-07-01T23:59:59.000Z

326

Digital materials for digital fabrication  

E-Print Network [OSTI]

This thesis introduces digital materials by analogy with digital computation and digital communications. Traditional fabrication techniques include pick-and-place, roll-to-roll, molding, patterning and more. Current research ...

Popescu, George A

2007-01-01T23:59:59.000Z

327

Graphene/metal Oxide Nanocomposites for Li-ion Batteries  

Science Journals Connector (OSTI)

Our work focuses on preparing the graphene/metal oxide nanocomposites by facile methold and exploring the graphene/metal oxide composites with unique structural or compositions for...

Liang, Junfei; Li, Lidong; Guo, Lin

328

Covalency in Metal-Oxygen Multiple Bonds Evaluated Using Oxygen...  

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

Covalency in Metal-Oxygen Multiple Bonds Evaluated Using Oxygen K-edge Spectroscopy and Electronic Structure Theory . Covalency in Metal-Oxygen Multiple Bonds Evaluated Using...

329

Polyamorphism in a Metallic Glass | Advanced Photon Source  

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

2000 | 1998 | Subscribe to APS Science Highlights rss feed Polyamorphism in a Metallic Glass MARCH 14, 2007 Bookmark and Share Structural modeling of the metallic glass: (a) A...

330

Facile fabrication of spherical nanoparticle-tipped AFM probes for plasmonic applications  

E-Print Network [OSTI]

for reliably producing metallic spherical nanoparticle tips using only a simple electrochemical cell. Fabrication of Au spherical nanoparticle (AuNP) tips onto commercial AFM probes is achieved using single-pulse high- fi eld electrochemical growth... is employed for growth since both the cell geometry and electrodeposition solution are kept the same between fabrications. AFM probes are attached to fl u- orine-doped tin oxide (FTO) conductive glass, used as a working DOI: 10.1002/ppsc.201400104 Facile...

Sanders, Alan; Zhang, Liwu; Bowman, Richard W.; Herrmann, Lars O.; Baumberg, Jeremy J.

2014-07-16T23:59:59.000Z

331

Fabrication of metallic nanostructures from sputtered nanocluster precursors  

E-Print Network [OSTI]

This thesis studies the morphological and electrical properties of copper nanocluster devices generated by DC magnetron sputtering and annealed at temperatures up to 1100 C. At each annealing step, the resistivity of the ...

DelHagen, William S

2004-01-01T23:59:59.000Z

332

Fabrication of Emissible Metallic Layer-by-Layer Photonic Crystals...  

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

crystals that can be used as highly efficient light sources.DescriptionOrdinary incandescent lamps waste most of the supplied electric power to emit invisible light such as...

333

Fabrication of amorphous metal matrix composites by severe plastic deformation  

E-Print Network [OSTI]

of Vitreloy 106a (Zr58.5Nb2.8Cu15.6Ni12.8Al10.3-wt%), ARLloy #1 (Hf71.3Cu16.2Ni7.6Ti2.2Al2.6 -wt%), and both of these amorphous alloys blended with crystalline phases of W, Cu and Ni. Novel instrumented extrusions and a host of postprocessing material...

Mathaudhu, Suveen Nigel

2006-10-30T23:59:59.000Z

334

Metal inks  

DOE Patents [OSTI]

Self-reducing metal inks and systems and methods for producing and using the same are disclosed. In an exemplary embodiment, a method may comprise selecting metal-organic (MO) precursor, selecting a reducing agent, and dissolving the MO precursor and the reducing agent in an organic solvent to produce a metal ink that remains in a liquid phase at room temperature. Metal inks, including self-reducing and fire-through metal inks, are also disclosed, as are various applications of the metal inks.

Ginley, David S; Curtis, Calvin J; Miedaner, Alex; van Hest, Marinus Franciscus Antonius Maria; Kaydanova, Tatiana

2014-02-04T23:59:59.000Z

335

Inert electrode containing metal oxides, copper and noble metal  

DOE Patents [OSTI]

A cermet composite material is made by treating at an elevated temperature a mixture comprising a compound of iron and a compound of at least one other metal, together with an alloy or mixture of copper and a noble metal. The alloy or mixture preferably comprises particles having an interior portion containing more copper than noble metal and an exterior portion containing more noble metal than copper. The noble metal is preferably silver. The cermet composite material preferably includes alloy phase portions and a ceramic phase portion. At least part of the ceramic phase portion preferably has a spinel structure.

Ray, Siba P. (Murrysville, PA); Woods, Robert W. (New Kensington, PA); Dawless, Robert K. (Monroeville, PA); Hosler, Robert B. (Sarver, PA)

2001-01-01T23:59:59.000Z

336

Inert electrode containing metal oxides, copper and noble metal  

DOE Patents [OSTI]

A cermet composite material is made by treating at an elevated temperature a mixture comprising a compound of iron and a compound of at least one other metal, together with an alloy or mixture of copper and a noble metal. The alloy or mixture preferably comprises particles having an interior portion containing more copper than noble metal and an exterior portion containing more noble metal than copper. The noble metal is preferably silver. The cermet composite material preferably includes alloy phase portions and a ceramic phase portion. At least part of the ceramic phase portion preferably has a spinel structure.

Ray, Siba P. (Murrysville, PA); Woods, Robert W. (New Kensington, PA); Dawless, Robert K. (Monroeville, PA); Hosler, Robert B. (Sarver, PA)

2000-01-01T23:59:59.000Z

337

Which Photodiode to Use: A Comparison of CMOS-Compatible Structures  

E-Print Network [OSTI]

AbstractWhile great advances have been made in optimizing fabrication process technologies for solid state image sensors, the need remains to be able to fabricate high quality photosensors in standard CMOS processes. The quality metrics depend on both the pixel architecture and the photosensitive structure. This paper presents a comparison of three photodiode structures in terms of spectral sensitivity, noise and dark current. The three structures are +-sub,-well-sub and +-well-sub. All structures were fabricated in a 0.5 m 3-metal, 2-poly,-well process and shared the same pixel and readout architectures. Two pixel structures were fabricatedthe standard three transistor active pixel sensor, where the output depends on the photodiode capacitance, and one incorporating an in-pixel capacitive transimpedance amplifier where the output is dependent only on a designed feedback capacitor. The-well-sub diode performed best in terms of sensitivity (an improvement of 3.5 and 1.6 over the +-sub and +-well-sub diodes, respectively) and signal-to-noise ratio (1.5 and 1.2 improvement over the +-sub and +-well-sub diodes, respectively) while the +-well-sub diode had the minimum (33 % compared to other two structures) dark current for a given sensitivity. Index TermsActive pixel sensors, CMOS, photodiodes. I.

Kartikeya Murari; Student Member; Ralph Etienne-cummings; Senior Member; Nitish Thakor; Gert Cauwenberghs; Senior Member

338

The near-edge structure in energy-loss spectroscopy: many-electron and magnetic effects in transition metal nitrides and carbides  

E-Print Network [OSTI]

in transition metal nitrides and carbides This article has been downloaded from IOPscience. Please scroll down-loss spectroscopy: many-electron and magnetic effects in transition metal nitrides and carbides A T Paxton, M van energies are systematically overestimated by 4.22 ± 0.44 eV in twelve transition metal carbides

Paxton, Anthony T.

339

The structures of CO, NO and benzene on various transition metal surfaces: Overview of LEED (low-energy electron diffraction) and HREELS (high-resolution electron energy loss) results  

SciTech Connect (OSTI)

Recent results are summarized concerning the adsorption structures of carbon monoxide (CO) and nitric oxide (NO) chemisorbed on various transition metal surfaces, and of benzene (C6H6) on Pd, Rh and Pt(111). These results were for the most part obtained with intensity analysis of low-energy electron diffraction (LEED) and high-resolution electron energy loss spectroscopy (HREELS).

Ohtani, H.; Van Hove, M.A.; Somorjai, G.A.

1987-06-01T23:59:59.000Z

340

Enforcement Letter, Diversified Metal Products, Inc - October 28, 2004 |  

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

Diversified Metal Products, Inc - October 28, Diversified Metal Products, Inc - October 28, 2004 Enforcement Letter, Diversified Metal Products, Inc - October 28, 2004 October 28, 2004 Issued to Diversified Metal Products, Inc. related to Transportainer Fabrication Deficiencies for the Waste Isolation Pilot Plant This letter addresses deficiencies associated with the fabrication of four transportainers delivered under contract to Washington TRU Solutions LLC (WTS) in support of their Characterization and Repackaging Modular Unit development. The Department of Energy's (DOE) Office of Price-Anderson Enforcement (OE) has reviewed your performance in delivering these transportainers and is concerned with the quality assurance aspects of your work activities in fabricating the transportainers. Enforcement Letter, Diversified Metal Products, Inc - October 28, 2004

Note: This page contains sample records for the topic "fabricated structural metal" 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

Enforcement Letter, Diversified Metal Products, Inc - October 28, 2004 |  

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

Diversified Metal Products, Inc - October 28, Diversified Metal Products, Inc - October 28, 2004 Enforcement Letter, Diversified Metal Products, Inc - October 28, 2004 October 28, 2004 Issued to Diversified Metal Products, Inc. related to Transportainer Fabrication Deficiencies for the Waste Isolation Pilot Plant This letter addresses deficiencies associated with the fabrication of four transportainers delivered under contract to Washington TRU Solutions LLC (WTS) in support of their Characterization and Repackaging Modular Unit development. The Department of Energy's (DOE) Office of Price-Anderson Enforcement (OE) has reviewed your performance in delivering these transportainers and is concerned with the quality assurance aspects of your work activities in fabricating the transportainers. Enforcement Letter, Diversified Metal Products, Inc - October 28, 2004

342

Metal Oxides  

Science Journals Connector (OSTI)

Metal oxides are the class of materials having the widest application in gas sensors. This chapter presents information related to the application of various metal oxides in gas sensors designed on different p...

Ghenadii Korotcenkov

2013-01-01T23:59:59.000Z

343

Epsilon Metal Waste Form for Immobilization of Noble Metals from Used Nuclear Fuel  

SciTech Connect (OSTI)

Epsilon metal (?-metal), an alloy of Mo, Pd, Rh, Ru, and Tc, is being developed as a waste form to treat and immobilize the undissolved solids and dissolved noble metals from aqueous reprocessing of commercial used nuclear fuel. Epsilon metal is an attractive waste form for several reasons: increased durability relative to borosilicate glass, it can be fabricated without additives (100% waste loading), and in addition it also benefits borosilicate glass waste loading by eliminating noble metals from the glass and thus the processing problems related there insolubility in glass. This work focused on the processing aspects of the epsilon metal waste form development. Epsilon metal is comprised of refractory metals resulting in high reaction temperatures to form the alloy, expected to be 1500 - 2000C making it a non-trivial phase to fabricate by traditional methods. Three commercially available advanced technologies were identified: spark-plasma sintering, microwave sintering, and hot isostatic pressing, and investigated as potential methods to fabricate this waste form. Results of these investigations are reported and compared in terms of bulk density, phase assemblage (X-ray diffraction and elemental analysis), and microstructure (scanning electron microscopy).

Crum, Jarrod V.; Strachan, Denis M.; Rohatgi, Aashish; Zumhoff, Mac R.

2013-02-01T23:59:59.000Z

344

Epsilon metal waste form for immobilization of noble metals from used nuclear fuel  

Science Journals Connector (OSTI)

Abstract Epsilon metal (?-metal), an alloy of Mo, Pd, Rh, Ru, and Tc, is being developed as a waste form to treat and immobilize the undissolved solids and dissolved noble metals from aqueous reprocessing of commercial used nuclear fuel. Epsilon metal is an attractive waste form for several reasons: increased durability relative to borosilicate glass, it can be fabricated without additives (100% waste loading), and in addition it also benefits borosilicate glass waste loading by eliminating noble metals from the glass, thus the processing problems related to their insolubility in glass. This work focused on the processing aspects of the epsilon metal waste form development. Epsilon metal is comprised of refractory metals resulting in high alloying temperatures, expected to be 15002000C, making it a non-trivial phase to fabricate by traditional methods. Three commercially available advanced technologies were identified: spark-plasma sintering, microwave sintering, and hot isostatic pressing, and investigated as potential methods to fabricate this waste form. Results of these investigations are reported and compared in terms of bulk density, phase assemblage (X-ray diffraction and elemental analysis), and microstructure (scanning electron microscopy).

Jarrod V. Crum; Denis Strachan; Aashish Rohatgi; Mac Zumhoff

2013-01-01T23:59:59.000Z

345

Advances in LIGA-Based Post-Mold Fabrication  

SciTech Connect (OSTI)

The establishment of a process to allow planarization of deep x-ray lithography based microfabncated metal components via diamond lapping has enabled examination of three additional microfabrication issues. The areas of improvement that are discussed include materials, microassembly and packaging, and multilevel fabrication. New materials work has centered on magnetic materials including precision micromagnets and surface treatments of electrodeposited materials. Assembly and packaging has been aided by deep silicon etch processing and the use of conventional precision milling equipment combined with press-tit assembly. Diffhsion bonding is shown to be a particularly important approach to achieving multilevel metal mechanisms and furthermore shows promise for achieving batch assembled and packaged high aspect-ratio metal micromechanics,

Christenson, T.R.

1998-10-21T23:59:59.000Z

346

Silicone metalization  

DOE Patents [OSTI]

A system for providing metal features on silicone comprising providing a silicone layer on a matrix and providing a metal layer on the silicone layer. An electronic apparatus can be produced by the system. The electronic apparatus comprises a silicone body and metal features on the silicone body that provide an electronic device.

Maghribi, Mariam N. (Livermore, CA); Krulevitch, Peter (Pleasanton, CA); Hamilton, Julie (Tracy, CA)

2006-12-05T23:59:59.000Z

347

Sacrificial template method of fabricating a nanotube  

DOE Patents [OSTI]

Methods of fabricating uniform nanotubes are described in which nanotubes were synthesized as sheaths over nanowire templates, such as using a chemical vapor deposition process. For example, single-crystalline zinc oxide (ZnO) nanowires are utilized as templates over which gallium nitride (GaN) is epitaxially grown. The ZnO templates are then removed, such as by thermal reduction and evaporation. The completed single-crystalline GaN nanotubes preferably have inner diameters ranging from 30 nm to 200 nm, and wall thicknesses between 5 and 50 nm. Transmission electron microscopy studies show that the resultant nanotubes are single-crystalline with a wurtzite structure, and are oriented along the <001> direction. The present invention exemplifies single-crystalline nanotubes of materials with a non-layered crystal structure. Similar "epitaxial-casting" approaches could be used to produce arrays and single-crystalline nanotubes of other solid materials and semiconductors. Furthermore, the fabrication of multi-sheath nanotubes are described as well as nanotubes having multiple longitudinal segments.

Yang, Peidong (Berkeley, CA); He, Rongrui (Berkeley, CA); Goldberger, Joshua (Berkeley, CA); Fan, Rong (El Cerrito, CA); Wu, Yi-Ying (Albany, CA); Li, Deyu (Albany, CA); Majumdar, Arun (Orinda, CA)

2007-05-01T23:59:59.000Z

348

Silicon metal-semiconductor-metal photodetector  

DOE Patents [OSTI]

Silicon MSM photodiodes sensitive to radiation in the visible to near infrared spectral range are produced by altering the absorption characteristics of crystalline Si by ion implantation. The implantation produces a defected region below the surface of the silicon with the highest concentration of defects at its base which acts to reduce the contribution of charge carriers formed below the defected layer. The charge carriers generated by the radiation in the upper regions of the defected layer are very quickly collected between biased Schottky barrier electrodes which form a metal-semiconductor-metal structure for the photodiode.

Brueck, Steven R. J. (Albuquerque, NM); Myers, David R. (Albuquerque, NM); Sharma, Ashwani K. (Albuquerque, NM)

1997-01-01T23:59:59.000Z

349

Silicon metal-semiconductor-metal photodetector  

DOE Patents [OSTI]

Silicon MSM photodiodes sensitive to radiation in the visible to near infrared spectral range are produced by altering the absorption characteristics of crystalline Si by ion implantation. The implantation produces a defected region below the surface of the silicon with the highest concentration of defects at its base which acts to reduce the contribution of charge carriers formed below the defected layer. The charge carriers generated by the radiation in the upper regions of the defected layer are very quickly collected between biased Schottky barrier electrodes which form a metal-semiconductor-metal structure for the photodiode.

Brueck, Steven R. J. (Albuquerque, NM); Myers, David R. (Albuquerque, NM); Sharma, Ashwani K. (Albuquerque, NM)

1995-01-01T23:59:59.000Z

350

Fabrication of inverted opal ZnO photonic crystals by atomic layer deposition  

E-Print Network [OSTI]

Fabrication of inverted opal ZnO photonic crystals by atomic layer deposition M. Scharrer, X. Wu, A method to fabricate so-called "inverted opal" structures which have the long-range order, high filling into opal or inverted opal backbones.3,5,13,14 Recently, atomic layer deposition ALD has been pro- posed

Cao, Hui

351

Uranium and other heavy metals in the plant-animal-human food chain near abandoned mining sites and structures in an American Indian community in northwestern New Mexico  

E-Print Network [OSTI]

Resource Evaluation (NURE) sampling that was undertaken inabove those found in the NURE sampling conducted in the1970s (Mo not evaluated by NURE). The other heavy metals (

Samuel-Nakamura, Christine

2013-01-01T23:59:59.000Z

352

Electrical properties of thin-film structures formed by pulsed laser deposition of Au, Ag, Cu, Pd, Pt, W, Zr metals on n-6H-SiC crystal  

SciTech Connect (OSTI)

Diode structures with ideality factors of 1.28-2.14 and potential barriers from 0.58 to 0.62 eV on the semiconductor side were formed by pulsed laser deposition of Au, Ag, Cu, Pd, Pt, W, and Zr metal films on n-6H-SiC crystal without epitaxial layer preparation. A high density of surface acceptor and donor states was formed at the metal-semiconductor interface during deposition of the laser-induced atomic flux, which violated the correlation between the potential barrier height and metal work function. The barrier heights determined from characteristic currents and capacitance measurements were in quite good agreement. For the used low-resistance semiconductor and contact elements, the sizes of majority carrier (electron) depletion regions were determined as 26-60 nm.

Romanov, R. I.; Zuev, V. V.; Fominskii, V. Yu., E-mail: vyfominskij@mephi.ru; Demin, M. V.; Grigoriev, V. V. [MEPhI National Research Nuclear University (Russian Federation)

2010-09-15T23:59:59.000Z

353

Nonequilibrium electron tunneling in metal-insulator-metal junctions  

Science Journals Connector (OSTI)

The small structure in the conductance curve near zero bias of metal-insulator-metal tunnel junctions has been studied extensively. These experiments are analyzed in detail in a nonequilibrium model. It is shown that this type of zero-bias anomaly can be accounted for entirely by an electron bottleneck arising from the blocking of tunneling states due to nonzero electron relaxation times.

J. G. Adler; H. J. Kreuzer; J. Straus

1975-04-15T23:59:59.000Z

354

Fabrication of Pd/Pd-Alloy Films by Surfactant Induced Electroless Plating for Hydrogen Separation from Advanced Coal Gasification Processes  

SciTech Connect (OSTI)

Dense Pd, Pd-Cu and Pd-Ag composite membranes on microporous stainless steel substrate (MPSS) were fabricated by a novel electroless plating (EP) process. In the conventional Pd-EP process, the oxidation-reduction reactions between Pd-complex and hydrazine result in an evolution of NH{sub 3} and N{sub 2} gas bubbles. When adhered to the substrate surface and in the pores, these gas bubbles hinder uniform Pd-film deposition which results in dendrite growth leading to poor film formation. This problem was addressed by introducing cationic surfactant in the electroless plating process known as surfactant induced electroless plating (SIEP). The unique features of this innovation provide control of Pd-deposition rate, and Pd-grain size distribution. The surfactant molecules play an important role in the EP process by tailoring grain size and the process of agglomeration by removing tiny gas bubbles through adsorption at the gas-liquid interface. As a result surfactant can tailor a nanocrystalline Pd, Cu and Ag deposition in the film resulting in reduced membrane film thickness. Also, it produces a uniform, agglomerated film structure. The Pd-Cu and Pd-Ag membranes on MPSS support were fabricated by sequential deposition using SIEP method. The pre- and post-annealing characterizations of these membranes (Pd, Pd-Cu and Pd-Ag on MPSS substrate) were carried out by SEM, EDX, XRD, and AFM studies. The SEM images show significant improvement of the membrane surface morphology, in terms of metal grain structures and grain agglomeration compared to the membranes fabricated by conventional EP process. The SEM images and helium gas-tightness studies indicate that dense and thinner films of Pd, Pd-Cu and Pd-Ag membranes can be produced with shorter deposition time using surfactant. H{sub 2} Flux through the membranes fabricated by SIEP shows large improvement compared to those by CEP with comparable permselectivity. Pd-MPSS composite membrane was subjected to test for long term performance and thermal cycling (573 - 723 - 573 K) at 15 psi pressure drop for 1200 hours. Pd membranes showed excellent hydrogen permeability and thermal stability during the operational period. Under thermal cycling (573 K - 873 K - 573 K), Pd-Cu-MPSS membrane was stable and retained hydrogen permeation characteristics for over three months of operation. From this limited study, we conclude that SIEP is viable method for fabrication of defect-free, robust Pd-alloy membranes for high-temperature H{sub 2}-separation applications.

Ilias, Shamsuddin; Kumar, Dhananjay

2012-07-31T23:59:59.000Z

355

Process for fabricating composite material having high thermal conductivity  

DOE Patents [OSTI]

A process for fabricating a composite material such as that having high thermal conductivity and having specific application as a heat sink or heat spreader for high density integrated circuits. The composite material produced by this process has a thermal conductivity between that of diamond and copper, and basically consists of coated diamond particles dispersed in a high conductivity metal, such as copper. The composite material can be fabricated in small or relatively large sizes using inexpensive materials. The process basically consists, for example, of sputter coating diamond powder with several elements, including a carbide forming element and a brazeable material, compacting them into a porous body, and infiltrating the porous body with a suitable braze material, such as copper-silver alloy, thereby producing a dense diamond-copper composite material with a thermal conductivity comparable to synthetic diamond films at a fraction of the cost.

Colella, Nicholas J. (Livermore, CA); Davidson, Howard L. (San Carlos, CA); Kerns, John A. (Livermore, CA); Makowiecki, Daniel M. (Livermore, CA)

2001-01-01T23:59:59.000Z

356

Method of electrode fabrication for solid oxide electrochemical cells  

DOE Patents [OSTI]

A process for fabricating cermet electrodes for solid oxide electrochemical cells by sintering is disclosed. First, a porous metal electrode is fabricated on a solid oxide cell, such as a fuel cell by, for example, sintering, and is then infiltrated with a high volume fraction stabilized zirconia suspension. A second sintering step is used to sinter the infiltrated zirconia to a high density in order to more securely attach the electrode to the solid oxide electrolyte of the cell. High performance fuel electrodes can be obtained with this process. Further electrode performance enhancement may be achieved if stabilized zirconia doped with cerium oxide, chromium oxide, titanium oxide, and/or praseodymium oxide for electronic conduction is used.

Jensen, Russell R. (Murrysville, PA)

1990-01-01T23:59:59.000Z

357

Method of electrode fabrication for solid oxide electrochemical cells  

DOE Patents [OSTI]

A process for fabricating cermet electrodes for solid oxide electrochemical cells by sintering is disclosed. First, a porous metal electrode is fabricated on a solid oxide cell, such as a fuel cell by, for example, sintering, and is then infiltrated with a high volume fraction stabilized zirconia suspension. A second sintering step is used to sinter the infiltrated zirconia to a high density in order to more securely attach the electrode to the solid oxide electrolyte of the cell. High performance fuel electrodes can be obtained with this process. Further electrode performance enhancement may be achieved if stabilized zirconia doped with cerium oxide, chromium oxide, titanium oxide, and/or praseodymium oxide for electronic conduction is used. 5 figs.

Jensen, R.R.

1990-11-20T23:59:59.000Z

358

METAL NANOPARTICLES FUNCTIONALIZED WITH METAL-LIGAND COVALENT BONDS  

E-Print Network [OSTI]

fundamental and technological perspectives, largely because these nanomaterials show unique optical and electronicelectronic energy structures, which may serve as a fundamentaland electronic characteristics, the metal nanoparticles have been attracting extensive interest in the field of fundamental

Kang, Xiongwu

2012-01-01T23:59:59.000Z

359

Pulsed laser planarization of metal films for multilevel interconnects  

SciTech Connect (OSTI)

Multilevel interconnect schemes for integrated circuits generally require one or more planarization steps, in order to maintain an acceptably flat topography for lithography and thin-film step coverage on the higher levels. Traditional approaches have involved planarization of the interlevel insulation (dielectric) layers, either by spin-on application (e.g., polyimide), or by reflow (e.g., phosphosilicate glass). We have pursued an alternative approach, in which each metal level is melted (hence planarized) using a pulsed laser prior to patterning. Short (approx.1 ..mu..s) pulses are used to preclude undesirable metallurgical reactions between the film, adhesion or barrier layer, and dielectric layer. Laser planarization of metals is particularly well suited to multilevel systems which include ground or power planes. Results are presented for planarization of gold films on SiO/sub 2/ dielectric layers using a flashlamp-pumped dye laser. The pulse duration is approx.1 ..mu..s, which allows the heat pulse to uniformly penetrate the gold while not penetrating substantially through the underlying SiO/sub 2/ (hence not perturbing the lower levels of metal). Excellent planarization of the gold films is achieved (less than 0.1 ..mu..m surface roughness, even starting with extreme topographic variations), as well as improved conductivity. To demonstrate the process, numerous planarized two-layer structures (transmission lines under a ground plane) were fabricated and characterized. 9 refs., 2 figs.

Tuckerman, D.B.; Schmitt, R.L.

1985-05-01T23:59:59.000Z

360

Three-dimensional nanostructures fabricated by stacking pre-patterned monocrystalline silicon nanomembranes  

E-Print Network [OSTI]

This thesis considers the viability of nanomembrane handling and stacking approaches to enable the fabrication of three-dimensional (3D) nano-structured materials. Sequentially stacking previously-patterned membranes to ...

Fucetola, Corey Patrick

2013-01-01T23:59:59.000Z

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


361

Digital fabrication in the architectural design process  

E-Print Network [OSTI]

Digital fabrication is affecting the architectural design process due to the increasingly important role it has in the fabrication of architectural models. Many design professionals, professors, and students have experienced ...

Seely, Jennifer C. K., 1975-

2004-01-01T23:59:59.000Z

362

Optimized fabrication and electrical analysis of silver nanowires templated on DNA molecules  

E-Print Network [OSTI]

. In this letter, we present the base sequence design of synthetic double-stranded DNA dsDNA and fabrication of metallic silver nanowires templated on both synthetic dsDNA and bacteriophage -DNA molecules. We also as programmable interconnects in bio- electronic devices. The DNA base sequence of the synthetic unit dsDNA tile

Finkelstein, Gleb

363

Reproducible Tip Fabrication and Cleaning for UHV STM . | EMSL  

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

Reproducible Tip Fabrication and Cleaning for UHV STM . Reproducible Tip Fabrication and Cleaning for UHV STM . Abstract: Several technical modifications related to the fabrication...

364

Examination of dissimilar metal welds in BWR and PWR piping  

SciTech Connect (OSTI)

This paper addresses dissimilar metal weld examinations at PWRS. Surveys were conducted to document the dissimilar metal weld configurations at PWR plants and to update the information known about dissimilar metal weld configurations at BWR plants. The experiences which BWR utilities have had with dissimilar metal weld examinations are documented and include: correct identification of IGSCC, indications thought to be IGSCC but were actually fabrication flaws, and difficulties encountered with the examination of dissimilar metal welds after stress improvement. An experimental program was conducted which verified that the longitudinal wave procedures developed for BWRs are also applicable to PWR designs.

MacDonald, D.E. [Electric Power Research Inst., Charlotte, NC (United States). NDE Center

1994-12-31T23:59:59.000Z

365

Crystallography of metal-organic frameworks  

Science Journals Connector (OSTI)

Recent advances in the crystallography of metal-organic frameworks (MOFs) are reviewed, including crystal growth, structural elucidation, in-situ and non-ambient crystallography.

G?ndara, F.

2014-10-28T23:59:59.000Z

366

Method of fabricating silicon carbide coatings on graphite surfaces  

DOE Patents [OSTI]

The vacuum plasma spray process produces well-bonded, dense, stress-free coatings for a variety of materials on a wide range of substrates. The process is used in many industries to provide for the excellent wear, corrosion resistance, and high temperature behavior of the fabricated coatings. In this application, silicon metal is deposited on graphite. This invention discloses the optimum processing parameters for as-sprayed coating qualities. The method also discloses the effect of thermal cycling on silicon samples in an inert helium atmosphere at about 1,600 C which transforms the coating to silicon carbide. 3 figs.

Varacalle, D.J. Jr.; Herman, H.; Burchell, T.D.

1994-07-26T23:59:59.000Z

367

Method of fabricating silicon carbide coatings on graphite surfaces  

DOE Patents [OSTI]

The vacuum plasma spray process produces well-bonded, dense, stress-free coatings for a variety of materials on a wide range of substrates. The process is used in many industries to provide for the excellent wear, corrosion resistance, and high temperature behavior of the fabricated coatings. In this application, silicon metal is deposited on graphite. This invention discloses the optimum processing parameters for as-sprayed coating qualities. The method also discloses the effect of thermal cycling on silicon samples in an inert helium atmosphere at about 1600.degree.C. which transforms the coating to silicon carbide.

Varacalle, Jr., Dominic J. (Idaho Falls, ID); Herman, Herbert (Port Jefferson, NY); Burchell, Timothy D. (Oak Ridge, TN)

1994-01-01T23:59:59.000Z

368

Fabrication technology for ODS Alloy MA957  

SciTech Connect (OSTI)

A successful fabrication schedule has been developed at Carpenter Technology Corporation for the production of MA957 fuel and blanket cladding. Difficulties with gun drilling, plug drawing and recrystallization were overcome to produce a pilot lot of tubing. This report documents the fabrication efforts of two qualified vendors and the support studies performed at WHC to develop the fabrication-schedule.

ML Hamilton; DS Gelles; RJ Lobsinger; MM Paxton; WF Brown

2000-03-16T23:59:59.000Z

369

Tutorial: Hot Topics in Personal Fabrication Research  

Science Journals Connector (OSTI)

In this tutorial, we survey novel ways for interacting with personal fabrication machines, such as laser cutters, milling machines, and 3D printers. The goal is to provide attendees with an overview of recent HCI re- search in personal fabrication and ... Keywords: 3d printing, laser cutting, milling machines, personal fabrication, rapid prototyping

Stefanie Mueller, Alexandra Ion, Patrick Baudisch

2014-11-01T23:59:59.000Z

370

NREL: Technology Transfer - Fabric-Covered Blades Could Make Wind Turbines  

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

Fabric-Covered Blades Could Make Wind Turbines Cheaper and More Efficient Fabric-Covered Blades Could Make Wind Turbines Cheaper and More Efficient A photo of a crew of workers watching as a wind blade is hauled up to a turbine for assembly. A new fabric-wrapped wind blade could eventually replace the traditional fiberglass blade, providing for lighter turbine components that could be built and assembled on site. January 2, 2013 A new design that calls for wrapping architectural fabric around metal wind turbine blades-instead of the traditional fiberglass-could be the latest revolution in dramatically reducing the cost of wind-produced power. That's the focus of a new project that partners NREL with General Electric (GE) and Virginia Polytechnic Institute & State University. Together, they are rethinking the way wind blades are designed,

371

Reference Alloy Waste Form Fabrication and Initiation of Reducing Atmosphere and Reductive Additives Study on Alloy Waste Form Fabrication  

SciTech Connect (OSTI)

This report describes the fabrication of two reference alloy waste forms, RAW-1(Re) and RAW-(Tc) using an optimized loading and heating method. The composition of the alloy materials was based on a generalized formulation to process various proposed feed streams resulting from the processing of used fuel. Waste elements are introduced into molten steel during alloy fabrication and, upon solidification, become incorporated into durable iron-based intermetallic phases of the alloy waste form. The first alloy ingot contained surrogate (non-radioactive), transition-metal fission products with rhenium acting as a surrogate for technetium. The second alloy ingot contained the same components as the first ingot, but included radioactive Tc-99 instead of rhenium. Understanding technetium behavior in the waste form is of particular importance due the longevity of Tc-99 and its mobility in the biosphere in the oxide form. RAW-1(Re) and RAW-1(Tc) are currently being used as test specimens in the comprehensive testing program investigating the corrosion and radionuclide release mechanisms of the representative alloy waste form. Also described in this report is the experimental plan to study the effects of reducing atmospheres and reducing additives to the alloy material during fabrication in an attempt to maximize the oxide content of waste streams that can be accommodated in the alloy waste form. Activities described in the experimental plan will be performed in FY12. The first aspect of the experimental plan is to study oxide formation on the alloy by introducing O2 impurities in the melt cover gas or from added oxide impurities in the feed materials. Reducing atmospheres will then be introduced to the melt cover gas in an attempt to minimize oxide formation during alloy fabrication. The second phase of the experimental plan is to investigate melting parameters associated with alloy fabrication to allow the separation of slag and alloy components of the melt.

S.M. Frank; T.P. O'Holleran; P.A. Hahn

2011-09-01T23:59:59.000Z

372

Application of Neutron-Absorbing Structural-Amorphous metal (SAM) Coatings for Spent Nuclear Fuel (SNF) Container to Enhance Criticality Safety Controls  

E-Print Network [OSTI]

material amorphous an essential property for corrosion resistance andcorrosion resistance. Many of these materials can be appliedMaterial (HPCRM) 1 can be thermally applied as coating onto base metal to provide for corrosion resistance

2006-01-01T23:59:59.000Z

373

Carbon nanotubes grown on bulk materials and methods for fabrication  

DOE Patents [OSTI]

Disclosed are structures formed as bulk support media having carbon nanotubes formed therewith. The bulk support media may comprise fibers or particles and the fibers or particles may be formed from such materials as quartz, carbon, or activated carbon. Metal catalyst species are formed adjacent the surfaces of the bulk support material, and carbon nanotubes are grown adjacent the surfaces of the metal catalyst species. Methods employ metal salt solutions that may comprise iron salts such as iron chloride, aluminum salts such as aluminum chloride, or nickel salts such as nickel chloride. Carbon nanotubes may be separated from the carbon-based bulk support media and the metal catalyst species by using concentrated acids to oxidize the carbon-based bulk support media and the metal catalyst species.

Menchhofer, Paul A. (Clinton, TN); Montgomery, Frederick C. (Oak Ridge, TN); Baker, Frederick S. (Oak Ridge, TN)

2011-11-08T23:59:59.000Z

374

Heterogeneous ultrathin films fabricated by alternate assembly of exfoliated layered double hydroxides and polyanionw  

E-Print Network [OSTI]

, respectively, An? n-valent anion).1 Their structure is based on brucite-like layers, where divalent metal

Wang, Zhong L.

375

Nanolithographic Fabrication and Heterogeneous Reaction Studies of Two-Dimensional Platinum Model Catalyst Systems  

E-Print Network [OSTI]

and truly tune the catalyst to the reaction. References 1.Gavriilidis, A. Varma, Catalyst Design, Cambridge UniversityStructure of Metallic Catalysts, Academic Press, London,

Contreras, A.M.

2006-01-01T23:59:59.000Z

376

Metal Toxicity  

Science Journals Connector (OSTI)

Problems posed to plants by metal toxicity in the soils of the world are basically of two kinds. The first kind are of natural origin. These arise either as a consequence of the nature of the parent material f...

T. McNeilly

1994-01-01T23:59:59.000Z

377

Structure  

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

Structure Structure functions 1 NOTE: THE FIGURES IN THIS SECTION ARE INTENDED TO SHOW THE REPRESENTATIVE DATA. THEY ARE NOT MEANT TO BE COMPLETE COMPILATIONS OF ALL THE WORLD'S RELIABLE DATA. Q 2 (GeV 2 ) F 2 (x,Q 2 ) * 2 i x H1 ZEUS BCDMS E665 NMC SLAC 10 -3 10 -2 10 -1 1 10 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 -1 1 10 10 2 10 3 10 4 10 5 10 6 Figure 16.6: The proton structure function F p 2 measured in electromagnetic scattering of positrons on protons (collider experiments ZEUS and H1), in the kinematic domain of the HERA data, for x > 0.00006 (cf. Fig. 16.9 for data at smaller x and Q 2 ), and for electrons (SLAC) and muons (BCDMS, E665, NMC) on a fixed target. Statistical and systematic errors added in quadrature are shown. The data are plotted as a function of Q 2 in bins of fixed x. Some points have been slightly offset in Q 2 for clarity. The ZEUS binning in x is used in this plot; all other data are rebinned to the x values of

378

Removing Stains from Washable Fabrics.  

E-Print Network [OSTI]

of May 8, 1914, as amended, and June 30, 1914, in cooperation with the United States Department of Agriculture. Zerle L. Carpenter, Director, Texas Agricultural Extension Service, The Texas A&M University System. lOM-1l-88, New CLO ...I UUL. Z TA24S.7 8873 NO.1616 B.1616 / Texas Agricultural Extension Service LIBRARY FEB 0 1 1989 Texas A&M University Removing Stains from Washable Fabrics Ann Vanderpoorten 8eard* Most spots and stains can be removed by prompt...

Beard, Ann Vanderpoorten

1988-01-01T23:59:59.000Z

379

Methods and devices for fabricating and assembling printable semiconductor elements  

DOE Patents [OSTI]

The invention provides methods and devices for fabricating printable semiconductor elements and assembling printable semiconductor elements onto substrate surfaces. Methods, devices and device components of the present invention are capable of generating a wide range of flexible electronic and optoelectronic devices and arrays of devices on substrates comprising polymeric materials. The present invention also provides stretchable semiconductor structures and stretchable electronic devices capable of good performance in stretched configurations.

Nuzzo, Ralph G. (Champaign, IL); Rogers, John A. (Champaign, IL); Menard, Etienne (Urbana, IL); Lee, Keon Jae (Savoy, IL); Khang, Dahl-Young (Urbana, IL); Sun, Yugang (Champaign, IL); Meitl, Matthew (Champaign, IL); Zhu, Zhengtao (Urbana, IL)

2009-11-24T23:59:59.000Z

380

Methods and devices for fabricating and assembling printable semiconductor elements  

DOE Patents [OSTI]

The invention provides methods and devices for fabricating printable semiconductor elements and assembling printable semiconductor elements onto substrate surfaces. Methods, devices and device components of the present invention are capable of generating a wide range of flexible electronic and optoelectronic devices and arrays of devices on substrates comprising polymeric materials. The present invention also provides stretchable semiconductor structures and stretchable electronic devices capable of good performance in stretched configurations.

Nuzzo, Ralph G; Rogers, John A; Menard, Etienne; Lee, Keon Jae; Khang, Dahl-Young; Sun, Yugang; Meitl, Matthew; Zhu, Zhengtao

2013-05-14T23:59:59.000Z

Note: This page contains sample records for the topic "fabricated structural metal" 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

Methods and devices for fabricating and assembling printable semiconductor elements  

DOE Patents [OSTI]

The invention provides methods and devices for fabricating printable semiconductor elements and assembling printable semiconductor elements onto substrate surfaces. Methods, devices and device components of the present invention are capable of generating a wide range of flexible electronic and optoelectronic devices and arrays of devices on substrates comprising polymeric materials. The present invention also provides stretchable semiconductor structures and stretchable electronic devices capable of good performance in stretched configurations.

Nuzzo, Ralph G; Rogers, John A; Menard, Etienne; Lee, Keon Jae; Khang, Dahl-Young; Sun, Yugang; Meitl, Matthew; Zhu, Zhengtao

2014-03-04T23:59:59.000Z

382

Methods and devices for fabricating and assembling printable semiconductor elements  

DOE Patents [OSTI]

The invention provides methods and devices for fabricating printable semiconductor elements and assembling printable semiconductor elements onto substrate surfaces. Methods, devices and device components of the present invention are capable of generating a wide range of flexible electronic and optoelectronic devices and arrays of devices on substrates comprising polymeric materials. The present invention also provides stretchable semiconductor structures and stretchable electronic devices capable of good performance in stretched configurations.

Nuzzo, Ralph G. (Champaign, IL); Rogers, John A. (Champaign, IL); Menard, Etienne (Durham, NC); Lee, Keon Jae (Daejeon, KR); Khang, Dahl-Young (Urbana, IL); Sun, Yugang (Champaign, IL); Meitl, Matthew (Raleigh, NC); Zhu, Zhengtao (Urbana, IL)

2011-07-19T23:59:59.000Z

383

Polymer micromold and fabrication process  

DOE Patents [OSTI]

A mold assembly is disclosed with micro-sized features in which the hollow portion thereof is fabricated from a sacrificial mandrel which is surface treated and then coated to form an outer shell. The sacrificial mandrel is then selectively etched away leaving the outer shell as the final product. The sacrificial mandrel is fabricated by a precision lathe, for example, so that when removed by etching the inner or hollow area has diameters as small as 10`s of micros ({micro}m). Varying the inside diameter contours of the mold can be accomplished with specified ramping slopes formed on the outer surface of the sacrificial mandrel, with the inside or hollow section being, for example, 275 {micro}m in length up to 150 {micro}m in diameter within a 6 mm outside diameter (o.d.) mold assembly. The mold assembly itself can serve as a micronozzle or microneedle, and plastic parts, such as microballoons for angioplasty, polymer microparts, and microactuators, etc., may be formed within the mold assembly. 6 figs.

Lee, A.P.; Northrup, M.A.; Ahre, P.E.; Dupuy, P.C.

1997-08-19T23:59:59.000Z

384

A Low Temperature Fully Lithographic Process For MetalOxide Field-Effect Transistors  

E-Print Network [OSTI]

We report a low temperature ( ~ 100 °C) lithographic method for fabricating hybrid metal oxide/organic field-effect transistors (FETs) that combine a zinc-indium-oxide (ZIO) semiconductor channel and organic, parylene, ...

Sodini, Charles G.

385

Highly reproducible and reliable metal/graphene contact by ultraviolet-ozone treatment  

SciTech Connect (OSTI)

Resist residue from the device fabrication process is a significant source of contamination at the metal/graphene contact interface. Ultraviolet Ozone (UVO) treatment is proven here, by X-ray photoelectron spectroscopy and Raman measurement, to be an effective way of cleaning the metal/graphene interface. Electrical measurements of devices that were fabricated by using UVO treatment of the metal/graphene contact region show that stable and reproducible low resistance metal/graphene contacts are obtained and the electrical properties of the graphene channel remain unaffected.

Li, Wei [Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871 (China); Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States); Hacker, Christina A.; Cheng, Guangjun; Hight Walker, A. R.; Richter, Curt A.; Gundlach, David J., E-mail: david.gundlach@nist.gov, E-mail: liangxl@pku.edu.cn [Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States); Liang, Yiran; Tian, Boyuan; Liang, Xuelei, E-mail: david.gundlach@nist.gov, E-mail: liangxl@pku.edu.cn; Peng, Lianmao [Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871 (China)

2014-03-21T23:59:59.000Z

386

Process development for a field emission structure  

E-Print Network [OSTI]

self-aligned process technology has been developed to fabricate field emis- sion structures using standard semiconductor fabrication procedures. Arrays of field emission diode structures incorporating silicon cathodes have been fabricated... already been fa. bricated. The aim of' this research is focused on developing a process technology to fabri- cate field emission structures incorporating a low work function cathode material. In addition, this technology must allow for adjustable anode...

Legg, James Derek

2012-06-07T23:59:59.000Z

387

Method for fabricating wrought components for high-temperature gas-cooled reactors and product  

DOE Patents [OSTI]

A method and alloys for fabricating wrought components of a high-temperature gas-cooled reactor are disclosed. These wrought, nickel-based alloys, which exhibit strength and excellent resistance to carburization at elevated temperatures, include aluminum and titanium in amounts and ratios to promote the growth of carburization resistant films while preserving the wrought character of the alloys. These alloys also include substantial amounts of molybdenum and/or tungsten as solid-solution strengtheners. Chromium may be included in concentrations less than 10% to assist in fabrication. Minor amounts of carbon and one or more carbide-forming metals also contribute to high-temperature strength.

Thompson, Larry D. (San Diego, CA); Johnson, Jr., William R. (San Diego, CA)

1985-01-01T23:59:59.000Z

388

J. Phys. Chem. 1988, 92, 2109-2115 2109 Early-versus Late-Transition-Metal-Oxo Bonds: The Electronlc Structure of VO' and  

E-Print Network [OSTI]

O' are also reported. These results indicate fundamental differences in the nature of the metal-oxo bond olefins and al- cohols to epoxides,diols, aldehydes, ketones, and carboxylic acidsS6 Late transition, excitation energies, and ionization potential~,~g>~and gas-phase studies of their chemical rea

Goddard III, William A.

389

Fabrication and Characterization of Organic Solar Cells.  

E-Print Network [OSTI]

??Bulk heterojunction organic solar cells have recently drawn tremendous attention because of their technological advantages for actualization of large-area and cost effective fabrication. Two important (more)

Yengel, Emre

2010-01-01T23:59:59.000Z

390

Lattice-mismatched GaInP LED devices and methods of fabricating same  

DOE Patents [OSTI]

A method (100) of fabricating an LED or the active regions of an LED and an LED (200). The method includes growing, depositing or otherwise providing a bottom cladding layer (208) of a selected semiconductor alloy with an adjusted bandgap provided by intentionally disordering the structure of the cladding layer (208). A first active layer (202) may be grown above the bottom cladding layer (208) wherein the first active layer (202) is fabricated of the same semiconductor alloy, with however, a partially ordered structure. The first active layer (202) will also be fabricated to include a selected n or p type doping. The method further includes growing a second active layer (204) above the first active layer (202) where the second active layer (204) Is fabricated from the same semiconductor alloy.

Mascarenhas, Angelo; Steiner, Myles A; Bhusal, Lekhnath; Zhang, Yong

2014-10-21T23:59:59.000Z

391

Nonequilibrium Phenomena in Electron Tunneling in Normal Metal-Insulator-Metal Junctions  

Science Journals Connector (OSTI)

Structure in the conductance of normal metal-insulator-metal junctions at very low bias is explained through a nonequilibrium treatment of the tunneling process. In particular, the related peak in the derivative d?(V)dV is quantitatively accounted for by the blocking of otherwise available electron tunneling states due to the finite electron relaxation rates in the metal electrodes.

P. N. Trofimenkoff; H. J. Kreuzer; W. J. Wattamaniuk; J. G. Adler

1972-08-28T23:59:59.000Z

392

E-Print Network 3.0 - actinide metal complexes Sample Search...  

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

metal actinide complex halides: thermochemical and structural Summary: on the thermodynamics of the actinide halogeno-complexes with alkali metal ions is reviewed, with...

393

CONTAINER MATERIALS, FABRICATION AND ROBUSTNESS  

SciTech Connect (OSTI)

The multi-barrier 3013 container used to package plutonium-bearing materials is robust and thereby highly resistant to identified degradation modes that might cause failure. The only viable degradation mechanisms identified by a panel of technical experts were pressurization within and corrosion of the containers. Evaluations of the container materials and the fabrication processes and resulting residual stresses suggest that the multi-layered containers will mitigate the potential for degradation of the outer container and prevent the release of the container contents to the environment. Additionally, the ongoing surveillance programs and laboratory studies should detect any incipient degradation of containers in the 3013 storage inventory before an outer container is compromised.

Dunn, K.; Louthan, M.; Rawls, G.; Sindelar, R.; Zapp, P.; Mcclard, J.

2009-11-10T23:59:59.000Z

394

Surface treatment of glass-reinforced plastics: Structural study of silane finish layers on the surface of glass fillers. Modification of finishes by transition metal salts  

Science Journals Connector (OSTI)

The structure and chemical composition of glass fiber surface treatment substances and their influence on composite materials...

O. E. Fedorova; T. L. Ragulina

2010-10-01T23:59:59.000Z

395

Nanotube Fabrication byNanotube Fabrication by Anodic Aluminum Oxide,Anodic Aluminum Oxide,  

E-Print Network [OSTI]

Nanotube Fabrication byNanotube Fabrication by Anodic Aluminum Oxide,Anodic Aluminum Oxide, Self-regulating phenomena in materials science: Self-assembly of nanopores during anodic oxidation of aluminum (AAO) Self combined anodic aluminum oxide (AAO) nanostructures with atomic layer deposition (ALD) to fabricate

Rubloff, Gary W.

396

Processing of Refractory Metal Alloys for JOYO Irradiations  

SciTech Connect (OSTI)

This is a summary of the refractory metal processing experienced by candidate Prometheus materiats as they were fabricated into specimens destined for testing within the JOYO test reactor, ex-reactor testing at Oak Ridge National Laboratory (ORNL), or testing within the NRPCT. The processing is described for each alloy from the point of inception to the point where processing was terminated due to the cancellation of Naval Reactor's involvement in the Prometheus Project. The alloys included three tantalum-base alloys (T-111, Ta-10W, and ASTAR-811C), a niobium-base alloy, (FS-85), and two molybdenum-rhenium alloys, one containing 44.5 w/o rhenium, and the other 47.5 w/o rhenium. Each of these alloys was either a primary candidate or back-up candidate for cladding and structural applications within the space reactor. Their production was intended to serve as a forerunner for large scale production ingots that were to be procured from commercial refractory metal vendors such as Wah Chang.

RF Luther; ME Petrichek

2006-02-21T23:59:59.000Z

397

Composite metal membrane  

DOE Patents [OSTI]

A composite metal membrane including a first metal layer of Group IVB met or Group VB metals, the first metal layer sandwiched between two layers of an oriented metal of palladium, platinum or alloys thereof is provided together with a process for the recovery of hydrogen from a gaseous mixture including contacting a hydrogen-containing gaseous mixture with a first side of a nonporous composite metal membrane including a first metal of Group IVB metals or Group VB metals, the first metal layer sandwiched between two layers of an oriented metal of palladium, platinum or alloys thereof, and, separating hydrogen from a second side of the nonporous composite metal membrane.

Peachey, Nathaniel M. (Espanola, NM); Dye, Robert C. (Los Alamos, NM); Snow, Ronny C. (Los Alamos, NM); Birdsell, Stephan A. (Los Alamos, NM)

1998-01-01T23:59:59.000Z

398

Composite metal membrane  

DOE Patents [OSTI]

A composite metal membrane including a first metal layer of Group IVB met or Group VB metals, the first metal layer sandwiched between two layers of an oriented metal of palladium, platinum or alloys thereof is provided together with a process for the recovery of hydrogen from a gaseous mixture including contacting a hydrogen-containing gaseous mixture with a first side of a nonporous composite metal membrane including a first metal of Group IVB metals or Group VB metals, the first metal layer sandwiched between two layers of an oriented metal of palladium, platinum or alloys thereof, and, separating hydrogen from a second side of the nonporous composite metal membrane.

Peachey, N.M.; Dye, R.C.; Snow, R.C.; Birdsell, S.A.

1998-04-14T23:59:59.000Z

399

Modal analysis and coupling in metal-insulator-metal waveguides  

Science Journals Connector (OSTI)

This paper shows how to analyze plasmonic metal-insulator-metal waveguides using the full modal structure of these guides. The analysis applies to all frequencies, particularly including the near infrared and visible spectrum, and to a wide range of sizes, including nanometallic structures. We use the approach here specifically to analyze waveguide junctions. We show that the full modal structure of the metal-insulator-metal (MIM) waveguideswhich consists of real and complex discrete eigenvalue spectra, as well as the continuous spectrumforms a complete basis set. We provide the derivation of these modes using the techniques developed for Sturm-Liouville and generalized eigenvalue equations. We demonstrate the need to include all parts of the spectrum to have a complete set of basis vectors to describe scattering within MIM waveguides with the mode-matching technique. We numerically compare the mode-matching formulation with finite-difference frequency-domain analysis and find very good agreement between the two for modal scattering at symmetric MIM waveguide junctions. We touch upon the similarities between the underlying mathematical structure of the MIM waveguide and the PT symmetric quantum-mechanical pseudo-Hermitian Hamiltonians. The rich set of modes that the MIM waveguide supports forms a canonical example against which other more complicated geometries can be compared. Our work here encompasses the microwave results but extends also to waveguides with real metals even at infrared and optical frequencies.

?kr Ekin Kocaba?; Georgios Veronis; David A. B. Miller; Shanhui Fan

2009-01-26T23:59:59.000Z

400

Diffusion-Driven Crystal Structure Transformation: Synthesis of Heusler Alloy  

E-Print Network [OSTI]

crystal transformation method would be valuable as a general method to fabricate metal-rich silicide nanowires that are otherwise difficult to synthesize. KEYWORDS Metal silicide, nanowire, crystal transformation, magnetic materials, Heusler alloy M etal silicide nanowires (NWs) can have diverse metal

Kim, Bongsoo

Note: This page contains sample records for the topic "fabricated structural metal" 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

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

402

Reproducible Tip Fabrication and Cleaning for UHV STM  

SciTech Connect (OSTI)

Several technical modifications related to the fabrication and ultra-high vacuum (UHV) treatment of the tips have been implemented to improve a reliability of the tip preparation for high-resolution scanning tunneling microscopy. The widely used drop-off technique for the tip electrochemical etching has been further refined to enable a reproducible fabrication of the tungsten tips with a radius ?3 nm. Simple and flexible setup for the tip UHV annealing has been developed and employed. The Ar ion sputtering with subsequent annealing has been adopted for a final tip treatment. The proper tip preparation has been demonstrated by imaging an atomic structure of the rutile TiO2(110) surface.

Yu, Zhongqing; Wang, Chong M.; Du, Yingge; Thevuthasan, Suntharampillai; Lyubinetsky, Igor

2006-11-09T23:59:59.000Z

403

Three dimensional fabric evolution of sheared sand  

SciTech Connect (OSTI)

Granular particles undergo translation and rolling when they are sheared. This paper presents a three-dimensional (3D) experimental assessment of fabric evolution of sheared sand at the particle level. F-75 Ottawa sand specimen was tested under an axisymmetric triaxial loading condition. It measured 9.5 mm in diameter and 20 mm in height. The quantitative evaluation was conducted by analyzing 3D high-resolution x-ray synchrotron micro-tomography images of the specimen at eight axial strain levels. The analyses included visualization of particle translation and rotation, and quantification of fabric orientation as shearing continued. Representative individual particles were successfully tracked and visualized to assess the mode of interaction between them. This paper discusses fabric evolution and compares the evolution of particles within and outside the shear band as shearing continues. Changes in particle orientation distributions are presented using fabric histograms and fabric tensor.

Hasan, Alsidqi; Alshibli, Khalid (UWA)

2012-10-24T23:59:59.000Z

404

A New Concept for the Fabrication of Hydrogen Selective Silica Membranes  

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

New CoNCept for the fAbriCAtioN of New CoNCept for the fAbriCAtioN of hydrogeN SeleCtive SiliCA MeMbrANeS Background As stated in the National Research Council report on Novel Approaches to Carbon Management, a novel membrane is needed that can achieve the separation of carbon dioxide (CO 2 ) and hydrogen (H 2 ) at a high temperature and pressure. Extensive efforts over the last several decades have explored high temperature H 2 -selective membranes made of silicon dioxide (SiO 2 ) and other oxides, palladium (Pd) and other metals or alloys and, more recently, various zeolites and non-aluminosilicate molecular sieves. Although promising separation results have been reported for many of them, these technologies, they all suffer from high production costs for membrane fabrication and from long term stability problems. This project revisits

405

Potential methods for the fabrication of high-T/sub c/ superconductors for wires and cables  

SciTech Connect (OSTI)

In this paper studies on practical properties, such as upper critical field and critical-current density of high-T/sub c/ oxide superconductors of Y-Ba-Cu-O, Bi-Sr-Ca-Cu-O, and Tl-Ba-Ca-Cu-O systems, are reviewed. Recent developments of fabrication processes that have good potentiality for producing wire or tape conductors of high-T/sub c/ oxide are then discussed. Some details are presented for the powder method (which is classified into use of an organic binder and a metal sheath) and for other fabrication processes using diffusion, solidification, and deposition techniques. For the Ag-sheathed oxide tapes, J/sub c/ values exceeding 10 000 A/cm/sup 2/ at 77 {Kappa} and 0 T have been reported for both Bi and Tl oxide materials. Further developments in fabrication processes that can overcome various problems limiting the transport J/sub c/ are required.

Tachikawa, K. (Tokai Univ., Hiratsuka, Kanagawa (Japan). Dept. of Physics); Togano, K. (National Research Inst. for Metals, Tsukuba, Ibaraki (Japan). Tsukuba Lab.)

1989-08-01T23:59:59.000Z

406

Structure, Mobility, and Composition of Transition Metal Catalyst Surfaces: High-Pressure Scanning Tunneling Microscopy and Ambient-Pressure X-ray Photoelectron Spectroscopy Studies  

E-Print Network [OSTI]

bimetallic nanoparticle catalysts is studied in Chapter 8.and Pt-based bimetallic nanoparticle catalysts, in order toseek the influence of catalyst surface structure on

Zhu, Zhongwei

2014-01-01T23:59:59.000Z

407

Structural and magnetic properties of transition metal substituted BaFe{sub 2}As{sub 2} compounds studied by x-ray and neutron scattering  

SciTech Connect (OSTI)

The purpose of my dissertation is to understand the structural and magnetic properties of the newly discovered FeAs-based superconductors and the interconnection between superconductivity, antiferromagnetism, and structure. X-ray and neutron scattering techniques are powerful tools to directly observe the structure and magnetism in this system. I used both xray and neutron scattering techniques on di#11;erent transition substituted BaFe2As2 compounds in order to investigate the substitution dependence of structural and magnetic transitions and try to understand the connections between them.

Kim, Min Gyu [Ames Laboratory

2012-08-28T23:59:59.000Z

408

The design and fabrication of two portal vein flow phantoms by different methods  

SciTech Connect (OSTI)

Purpose: This study outlines the design and fabrication techniques for two portal vein flow phantoms. Methods: A materials study was performed as a precursor to this phantom fabrication effort and the desired material properties are restated for continuity. A three-dimensional portal vein pattern was created from the Visual Human database. The portal vein pattern was used to fabricate two flow phantoms by different methods with identical interior surface geometry using computer aided design software tools and rapid prototyping techniques. One portal flow phantom was fabricated within a solid block of clear silicone for use on a table with Ultrasound or within medical imaging systems such as MRI, CT, PET, or SPECT. The other portal flow phantom was fabricated as a thin walled tubular latex structure for use in water tanks with Ultrasound imaging. Both phantoms were evaluated for usability and durability. Results: Both phantoms were fabricated successfully and passed durability criteria for flow testing in the next project phase. Conclusions: The fabrication methods and materials employed for the study yielded durable portal vein phantoms.

Yunker, Bryan E., E-mail: bryan.yunker@ucdenver.edu; Lanning, Craig J.; Shandas, Robin; Hunter, Kendall S. [Department of Bioengineering, University of Colorado Denver/Anschutz, 12700 East 19th Avenue, MS 8607, Aurora, Colorado 80045 (United States)] [Department of Bioengineering, University of Colorado Denver/Anschutz, 12700 East 19th Avenue, MS 8607, Aurora, Colorado 80045 (United States); Dodd, Gerald D., E-mail: gerald.dodd@ucdenver.edu; Chang, Samuel; Scherzinger, Ann L. [Department of Radiology, University of Colorado SOM, 12401 East 17th Avenue, Mail Stop L954, Aurora, Colorado 80045 (United States)] [Department of Radiology, University of Colorado SOM, 12401 East 17th Avenue, Mail Stop L954, Aurora, Colorado 80045 (United States); Chen, S. James, E-mail: james.chen@ucdenver.edu [Department of Medicine, University of Colorado Denver, Colorado 80045 and Department of Medicine/Cardiology, University of Colorado SOM, 12401 East 17th Avenue, Mail Stop B132, Aurora, Colorado 80045 (United States); Feng, Yusheng, E-mail: yusheng.feng@utsa.edu [Department of Mechanical Engineering, University of Texas San Antonio, One UTSA Circle, Mail Stop: AET 2.332, San Antonio, Texas 782490670 (United States)] [Department of Mechanical Engineering, University of Texas San Antonio, One UTSA Circle, Mail Stop: AET 2.332, San Antonio, Texas 782490670 (United States)

2014-02-15T23:59:59.000Z

409

Literature on fabrication of tungsten for application in pyrochemical processing of spent nuclear fuels  

SciTech Connect (OSTI)

The pyrochemical processing of nuclear fuels requires crucibles, stirrers, and transfer tubing that will withstand the temperature and the chemical attack from molten salts and metals used in the process. This report summarizes the literature that pertains to fabrication (joining, chemical vapor deposition, plasma spraying, forming, and spinning) is the main theme. This report also summarizes a sampling of literature on molbdenum and the work previously performed at Argonne National Laboratory on other container materials used for pyrochemical processing of spent nuclear fuels.

Edstrom, C.M.; Phillips, A.G.; Johnson, L.D.; Corle, R.R.

1980-10-11T23:59:59.000Z

410

Nonmetal-metal transition in metalmolten-salt solutions  

Science Journals Connector (OSTI)

The method of ab initio molecular dynamics, based on finite-temperature density-functional theory, is used to study the nonmetal-metal transition in two different metalmolten-salt solutions, Kx(KCl)1-x and Nax(NaBr)1-x. As the excess metal concentration is increased the electronic density becomes delocalized and percolating conducting paths are formed, making a significant dc electrical conductivity possible. This marks the onset of the metallic regime. By calculating several electronic and structural properties, remarkable differences between the two solutions are observed. The anomalous behavior of Nax(NaBr)1-x, typical of all the Na-NaX solutions, is found to be related to the strong attractive interaction between the sodium ions and the excess electrons. 1996 The American Physical Society.

Pier Luigi Silvestrelli; Ali Alavi; Michele Parrinello; Daan Frenkel

1996-05-15T23:59:59.000Z

411

Design & Fabrication of a High-Voltage Photovoltaic Cell  

SciTech Connect (OSTI)

Silicon photovoltaic (PV) cells are alternative energy sources that are important in sustainable power generation. Currently, applications of PV cells are limited by the low output voltage and somewhat low efficiency of such devices. In light of this fact, this project investigates the possibility of fabricating high-voltage PV cells on float-zone silicon wafers having output voltages ranging from 50 V to 2000 V. Three designs with different geometries of diffusion layers were simulated and compared in terms of metal coverage, recombination, built-in potential, and conduction current density. One design was then chosen and optimized to be implemented in the final device design. The results of the simulation serve as a feasibility test for the design concept and provide supportive evidence of the effectiveness of silicon PV cells as high-voltage power supplies.

Felder, Jennifer; /North Carolina State U. /SLAC

2012-09-05T23:59:59.000Z

412

Fabrication of solid oxide fuel cell by electrochemical vapor deposition  

DOE Patents [OSTI]

In a high temperature solid oxide fuel cell (SOFC), the deposition of an impervious high density thin layer of electrically conductive interconnector material, such as magnesium doped lanthanum chromite, and of an electrolyte material, such as yttria stabilized zirconia, onto a porous support/air electrode substrate surface is carried out at high temperatures (approximately 1100.degree.-1300.degree. C.) by a process of electrochemical vapor deposition. In this process, the mixed chlorides of the specific metals involved react in the gaseous state with water vapor resulting in the deposit of an impervious thin oxide layer on the support tube/air electrode substrate of between 20-50 microns in thickness. An internal heater, such as a heat pipe, is placed within the support tube/air electrode substrate and induces a uniform temperature profile therein so as to afford precise and uniform oxide deposition kinetics in an arrangement which is particularly adapted for large scale, commercial fabrication of SOFCs.

Brian, Riley (Willimantic, CT); Szreders, Bernard E. (Oakdale, CT)

1989-01-01T23:59:59.000Z

413

Microchannel crossflow fluid heat exchanger and method for its fabrication  

DOE Patents [OSTI]

A microchannel crossflow fluid heat exchanger and a method for its fabrication are disclosed. The heat exchanger is formed from a stack of thin metal sheets which are bonded together. The stack consists of alternating slotted and unslotted sheets. Each of the slotted sheets includes multiple parallel slots which form fluid flow channels when sandwiched between the unslotted sheets. Successive slotted sheets in the stack are rotated ninety degrees with respect to one another so as to form two sets of orthogonally extending fluid flow channels which are arranged in a crossflow configuration. The heat exchanger has a high surface to volume ratio, a small dead volume, a high heat transfer coefficient, and is suitable for use with fluids under high pressures. The heat exchanger has particular application in a Stirling engine that utilizes a liquid as the working substance. 9 figs.

Swift, G.W.; Migliori, A.; Wheatley, J.C.

1985-05-14T23:59:59.000Z

414

Microchannel crossflow fluid heat exchanger and method for its fabrication  

DOE Patents [OSTI]

A microchannel crossflow fluid heat exchanger and a method for its fabrication are disclosed. The heat exchanger is formed from a stack of thin metal sheets which are bonded together. The stack consists of alternating slotted and unslotted sheets. Each of the slotted sheets includes multiple parallel slots which form fluid flow channels when sandwiched between the unslotted sheets. Successive slotted sheets in the stack are rotated ninety degrees with respect to one another so as to form two sets of orthogonally extending fluid flow channels which are arranged in a crossflow configuration. The heat exchanger has a high surface to volume ratio, a small dead volume, a high heat transfer coefficient, and is suitable for use with fluids under high pressures. The heat exchanger has particular application in a Stirling engine that utilizes a liquid as the working substance.

Swift, G.W.; Migliori, A.; Wheatley, J.C.

1982-08-31T23:59:59.000Z

415

Fabrication of solid oxide fuel cell by electrochemical vapor deposition  

DOE Patents [OSTI]

In a high temperature solid oxide fuel cell (SOFC), the deposition of an impervious high density thin layer of electrically conductive interconnector material, such as magnesium doped lanthanum chromite, and of an electrolyte material, such as yttria stabilized zirconia, onto a porous support/air electrode substrate surface is carried out at high temperatures (/approximately/1100/degree/ /minus/ 1300/degree/C) by a process of electrochemical vapor deposition. In this process, the mixed chlorides of the specific metals involved react in the gaseous state with water vapor resulting in the deposit of an impervious thin oxide layer on the support tube/air electrode substrate of between 20--50 microns in thickness. An internal heater, such as a heat pipe, is placed within the support tube/air electrode substrate and induces a uniform temperature profile therein so as to afford precise and uniform oxide deposition kinetics in an arrangement which is particularly adapted for large scale, commercial fabrication of SOFCs.

Riley, B.; Szreders, B.E.

1988-04-26T23:59:59.000Z

416

DOE Science Showcase - Rare Earth Metal Research from DOE Databases |  

Office of Scientific and Technical Information (OSTI)

Rare Earth Metal Research from DOE Databases Rare Earth Metal Research from DOE Databases Information Bridge Energy Citations Database Highlighted documents of Rare Earth Metal research in DOE databases Information Bridge - Corrosion-resistant metal surfaces DOE R&D Project Summaries - Structural and magnetic studies on heavy rare earth metals at high pressures using designer diamonds Energy Citations Database - Intermultiplet transitions in rare-earth metals DOE Green Energy - LaNi.sub.5 is-based metal hydride electrode in Ni-MH rechargeable cells Science.gov - H.R.4866 - Rare Earths Supply-Chain Technology and Resources Transformation Act of 2010 WorldWideScience.org - China produces most of the world's rare earth metals DOepatents - Recycling of rare earth metals from rare earth-transition metal alloy scrap by liquid metal extraction

417

Fabrication of phosphor micro-grids using proton beam lithography.  

SciTech Connect (OSTI)

A new nuclear microscopy technique called ion photon emission microscopy or IPEM was recently invented. IPEM allows analysis involving single ions, such as ion beam induced charge (IBIC) or single event upset (SEU) imaging using a slightly modified optical microscope. The spatial resolution of IPEM is currently limited to more than 10 {micro}m by the scattering and reflection of ion-induced photons, i.e. light blooming or spreading, in the ionoluminescent phosphor layer. We are developing a 'Microscopic Gridded Phosphor' (also called Black Matrix) where the phosphor nanocrystals are confined within the gaps of a micrometer scale opaque grid, which limits the amount of detrimental light blooming. MeV-energy proton beam lithography is ideally suited to lithographically form masks for the grid because of high aspect ratio, pattern density and sub-micron resolution of this technique. In brief, the fabrication of the grids was made in the following manner: (1) a MeV proton beam focused to 1.5-2 {micro}m directly fabricated a matrix of pillars in a 15 {micro}m thick SU-8 lithographic resist; (2) 7:1 aspect ratio pillars were then formed by developing the proton exposed area; (3) Ni (Au) was electrochemically deposited onto Cu-coated Si from a sulfamate bath (or buffered CN bath); (4) the SU-8 pillars were removed by chemical etching; finally (5) the metal micro-grid was freed from its substrate by etching the underlying Cu layer. Our proposed metal micro-grids promise an order-of-magnitude improvement in the resolution of IPEM.

Rossi, Paolo (University of Padova and INFN, Padova, Italy); Antolak, Arlyn J.; Provencio, Paula Polyak; Doyle, Barney Lee; Malmqvist, Klas (Lund Institute of Technology, Lund, Sweden); Hearne, Sean Joseph; Nilsson, Christer (Lund Institute of Technology, Lund, Sweden); Kristiansson, Per (Lund Institute of Technology, Lund, Sweden); Wegden, Marie (Lund Institute of Technology, Lund, Sweden); Elfman, Mikael (Lund Institute of Technology, Lund, Sweden); Pallon, Jan (Lund Institute of Technology, Lund, Sweden); Auzelyte, Vaida (Lund Institute of Technology, Lund, Sweden)

2005-07-01T23:59:59.000Z

418

Metallic coatings on silicon substrates, and methods of forming metallic coatings on silicon substrates  

DOE Patents [OSTI]

The invention includes methods of forming a metallic coating on a substrate which contains silicon. A metallic glass layer is formed over a silicon surface of the substrate. The invention includes methods of protecting a silicon substrate. The substrate is provided within a deposition chamber along with a deposition target. Material from the deposition target is deposited over at least a portion of the silicon substrate to form a protective layer or structure which contains metallic glass. The metallic glass comprises iron and one or more of B, Si, P and C. The invention includes structures which have a substrate containing silicon and a metallic layer over the substrate. The metallic layer contains less than or equal to about 2 weight % carbon and has a hardness of at least 9.2 GPa. The metallic layer can have an amorphous microstructure or can be devitrified to have a nanocrystalline microstructure.

Branagan, Daniel J. (Idaho Falls, ID); Hyde, Timothy A. (Idaho Falls, ID); Fincke, James R. (Los Alamos, NM)

2008-03-11T23:59:59.000Z

419

Metal-based reactive nanomaterials  

Science Journals Connector (OSTI)

Recent developments in materials processing and characterization resulted in the discovery of a new type of reactive materials containing nanoscaled metal components. The well-known high oxidation energies of metallic fuels can now be released very rapidly because of the very high reactive interface areas in such metal-based reactive nanomaterials. Consequently, these materials are currently being examined for an entire range of applications in energetic formulations inappropriate for conventional, micron-sized metal fuels having relatively low reaction rates. New application areas, such as reactive structural materials, are also being explored. Research remains active in manufacturing and characterization of metal-based reactive nanomaterials including elemental metal nanopowders and various nanocomposite material systems. Because of the nanometer scale of the individual particles, or phase domains, and because of the very high enthalpy of reaction between components of the nanocomposite materials, the final phase compositions, morphology, and thermodynamic properties of the reactive nanocomposite materials may be different from those of their micron-scaled counterparts. Ignition mechanisms in such materials can be governed by heterogeneous reactions that are insignificant for materials with less developed reactive interface areas. New combustion regimes are being observed that are affected by very short ignition delays combined with very high metal combustion temperatures. Current progress in this rapidly growing research area is reviewed and some potential directions for the future research are discussed.

Edward L. Dreizin

2009-01-01T23:59:59.000Z

420

New route to the fabrication of nanocrystalline diamond films  

SciTech Connect (OSTI)

Nanocrystalline diamond (NCD) thin films offer applications in various fields, but the existing synthetic approaches are cumbersome and destructive. A major breakthrough has been achieved by our group in the direction of a non-destructive, scalable, and economic process of NCD thin-film fabrication. Here, we report a cheap precursor for the growth of nanocrystalline diamond in the form of paraffin wax. We show that NCD thin films can be fabricated on a copper support by using simple, commonplace paraffin wax under reaction conditions of Hot Filament Chemical Vapor Deposition (HFCVD). Surprisingly, even the presence of any catalyst or seeding that has been conventionally used in the state-of-the-art is not required. The structure of the obtained films was analyzed by scanning electron microscopy and transmission electron microscopy. Raman spectroscopy and electron energy-loss spectroscopy recorded at the carbon K-edge region confirm the presence of nanocrystalline diamond. The process is a significant step towards cost-effective and non-cumbersome fabrication of nanocrystalline diamond thin films for commercial production.

Varshney, Deepak, E-mail: deepvar20@gmail.com; Morell, Gerardo [Institute of Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico 00931, Puerto Rico (United States); Department of Physics, University of Puerto Rico, San Juan, PO Box 70377, Puerto Rico 00936, Puerto Rico (United States); Palomino, Javier; Resto, Oscar [Department of Physics, University of Puerto Rico, San Juan, PO Box 70377, Puerto Rico 00936, Puerto Rico (United States); Gil, Jennifer [Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00936, Puerto Rico (United States); Weiner, Brad R. [Institute of Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico 00931, Puerto Rico (United States); Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00936, Puerto Rico (United States)

2014-02-07T23:59:59.000Z

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


421

Enforcement Letter, Parsons Technology Development & Fabrication Complex -  

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

Parsons Technology Development & Fabrication Parsons Technology Development & Fabrication Complex - April 13, 2010 Enforcement Letter, Parsons Technology Development & Fabrication Complex - April 13, 2010 April 13, 2010 Enforcement Letter issued to Parsons Technology Development & Fabrication Complex related to Deficiencies in the Fabrication of Safety Significant Embed Plates at the Salt Waste Processing Facility at the Savannah River Site This letter refers to the Office of Health, Safety and Security's Office of Enforcement's investigation into the facts and circumstances associated with quality assurance deficiencies in the fabrication of safety significant embed plates. These embed plates were fabricated by Parsons Technology Development and Fabrication Complex (PTDFC) a supplier to

422

FABRICATION AND CHARACTERIZATION OF MEMS THERMAL INTERFACE MATERIALS .  

E-Print Network [OSTI]

??This work presents the fabrication and characterization of MEMS thermal interface materials. Different materials were used to fabricate and characterize different configurations of sample thermal (more)

[No author

2011-01-01T23:59:59.000Z

423

Hydrogen Station Test Device Design and Fabrication | Department...  

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

Hydrogen Station Test Device Design and Fabrication Hydrogen Station Test Device Design and Fabrication October 2, 2014 - 3:02pm Addthis Open Date: August 26, 2014 Requesting...

424

Liquid metal cooled nuclear reactor plant system  

DOE Patents [OSTI]

A liquid metal cooled nuclear reactor having a passive cooling system for removing residual heat resulting for fuel decay during reactor shutdown, or heat produced during a mishap. The reactor system is enhanced with sealing means for excluding external air from contact with the liquid metal coolant leaking from the reactor vessel during an accident. The invention also includes a silo structure which resists attack by leaking liquid metal coolant, and an added unique cooling means.

Hunsbedt, Anstein (Los Gatos, CA); Boardman, Charles E. (Saratoga, CA)

1993-01-01T23:59:59.000Z

425

Doping Graphene with Metal Contacts  

Science Journals Connector (OSTI)

Making devices with graphene necessarily involves making contacts with metals. We use density functional theory to study how graphene is doped by adsorption on metal substrates and find that weak bonding on Al, Ag, Cu, Au, and Pt, while preserving its unique electronic structure, can still shift the Fermi level with respect to the conical point by ?0.5??eV. At equilibrium separations, the crossover from p-type to n-type doping occurs for a metal work function of ?5.4??eV, a value much larger than the graphene work function of 4.5eV. The numerical results for the Fermi level shift in graphene are described very well by a simple analytical model which characterizes the metal solely in terms of its work function, greatly extending their applicability.

G. Giovannetti; P. A. Khomyakov; G. Brocks; V. M. Karpan; J. van den Brink; P. J. Kelly

2008-07-10T23:59:59.000Z

426

Characteristics of Various Photodiode Structures in CMOS Technology with Monolithic Signal Processing Electronics  

SciTech Connect (OSTI)

Monolithic optical sensor with readout electronics are needed in optical communication, medical imaging and scintillator based gamma spectroscopy system. This paper presents the design of three different CMOS photodiode test structures and two readout channels in a commercial CMOS technology catering to the need of nuclear instrumentation. The three photodiode structures each of 1 mm{sup 2} with readout electronics are fabricated in 0.35 um, 4 metal, double poly, N-well CMOS process. These photodiode structures are based on available P-N junction of standard CMOS process i.e. N-well/P-substrate, P+/N-well/P-substrate and inter-digitized P+/N-well/P-substrate. The comparisons of typical characteristics among three fabricated photo sensors are reported in terms of spectral sensitivity, dark current and junction capacitance. Among the three photodiode structures N-well/P-substrate photodiode shows higher spectral sensitivity compared to the other two photodiode structures. The inter-digitized P+/N-well/P-substrate structure has enhanced blue response compared to N-well/P-substrate and P+/N-well/P-substrate photodiode. Design and test results of monolithic readout electronics, for three different CMOS photodiode structures for application related to nuclear instrumentation, are also reported.

Mukhopadhyay, Sourav; Chandratre, V. B.; Sukhwani, Menka; Pithawa, C. K. [Centre for Microelectronics, Prabhadevi, Mumbai-400028 (India)

2011-10-20T23:59:59.000Z

427

Structural and magnetic properties of transition metal substituted BaFe2As2 compounds studied by x-ray and neutron scattering.  

E-Print Network [OSTI]

??The purpose of my dissertation is to understand the structural and magnetic properties of the newly discovered FeAs-based superconductors and the interconnection between superconductivity, antiferromagnetism, (more)

Kim, Min Gyu

2012-01-01T23:59:59.000Z

428

Characterization of candidate DOE sites for fabricating MOX fuel for lead assemblies  

SciTech Connect (OSTI)

The Office of Fissile Materials Disposition (MD) of the Department of Energy (DOE) is directing the program to disposition US surplus weapons-usable plutonium. For the reactor option for disposition of this surplus plutonium, MD is seeking to contract with a consortium, which would include a mixed-oxide (MOX) fuel fabricator and a commercial US reactor operator, to fabricate and burn MOX fuel in existing commercial nuclear reactors. This option would entail establishing a MOX fuel fabrication facility under the direction of the consortium on an existing DOE site. Because of the lead time required to establish a MOX fuel fabrication facility and the need to qualify the MOX fuel for use in a commercial reactor, MD is considering the early fabrication of lead assemblies (LAs) in existing DOE facilities under the technical direction of the consortium. The LA facility would be expected to produce a minimum of 1 metric ton heavy metal per year and must be operational by June 2003. DOE operations offices were asked to identify candidate sites and facilities to be evaluated for suitability to fabricate MOX fuel LAs. Savannah River Site, Argonne National Laboratory-West, Hanford, Lawrence Livermore National Laboratory, and Los Alamos National Laboratory were identified as final candidates to host the LA project. A Site Evaluation Team (SET) worked with each site to develop viable plans for the LA project. SET then characterized the suitability of each of the five plans for fabricating MOX LAs using 28 attributes and documented the characterization to aid DOE and the consortium in selecting the site for the LA project. SET concluded that each option has relative advantages and disadvantages in comparison with other options; however, each could meet the requirements of the LA project as outlined by MD and SET.

Holdaway, R.F.; Miller, J.W.; Sease, J.D.; Moses, R.J.; O`Connor, D.G. [Oak Ridge National Lab., TN (United States); Carrell, R.D. [Technical Resources International, Inc., Richland, WA (United States); Jaeger, C.D. [Sandia National Labs., Albuquerque, NM (United States); Thompson, M.L.; Strasser, A.A. [Delta-21 Resources, Inc., Oak Ridge, TN (United States)

1998-03-01T23:59:59.000Z

429

Mechanochemical processing for metals and metal alloys  

DOE Patents [OSTI]

A set of processes for preparing metal powders, including metal alloy powders, by ambient temperature reduction of a reducible metal compound by a reactive metal or metal hydride through mechanochemical processing. The reduction process includes milling reactants to induce and complete the reduction reaction. The preferred reducing agents include magnesium and calcium hydride powders. A process of pre-milling magnesium as a reducing agent to increase the activity of the magnesium has been established as one part of the invention.

Froes, Francis H. (Moscow, ID); Eranezhuth, Baburaj G. (Moscow, ID); Prisbrey, Keith (Moscow, ID)

2001-01-01T23:59:59.000Z

430

Fabrication and properties of microporous silicon  

E-Print Network [OSTI]

Microporous silicon layers were fabricated by electrochemical etching of single crystalline silicon wafers in HF-ethanol solutions. The pore properties of porous silicon were examined by physical adsorption of nitrogen and the relationship between...

Shao, Jianzhong

1994-01-01T23:59:59.000Z

431

FSC Request Form ME FABRICATION SUPPORT CENTER  

E-Print Network [OSTI]

:__________________ Date:__________________ ________Hrs Cost: $ ________________ Fabrication of Job Machine on Loan Material Tooling Machine Operation Cost Manpower Assistance --- Name : ___________________ _______ Hrs Cost: $ ______ Please tick CNC Lathe / Milling Lathe / Milling EDM / Wire Cut Welding Ripping Saw / Planner Power Shear

Zhiwei, Huang

432

Materials compatibility issues for fabric composite radiators  

SciTech Connect (OSTI)

Short term materials compatibility tests have been completed on potential materials to be used in fabric composite radiators for space applications. Specific materials tested include copper, aluminum, titanium, FEP Teflon tubing, and three high strength fabric fibers: alumina-boria-silica, silicon carbide, and silicon dioxide. These materials have been exposed to pure water, methanol, and acetone for periods of time up to 5000 hours at variety of appropriate temperatures.

Marks, T.S.; Klein, A.C. (Department of Nuclear Engineering, Radiation Center, C116, Oregon State University, Corvallis, Oregon 97331-5902 (US))

1991-01-01T23:59:59.000Z

433

Carbon nanotube collimator fabrication and application  

DOE Patents [OSTI]

Apparatus, methods, systems and devices for fabricating individual CNT collimators. Micron size fiber coated CNT samples are synthesized with chemical vapor deposition method and then the individual CNT collimators are fabricated with focused ion beam technique. Unfocused electron beams are successfully propagated through the CNT collimators. The CNT nano-collimators are used for applications including single ion implantation and in high-energy physics, and allow rapid, reliable testing of the transmission of CNT arrays for transport of molecules.

Chow, Lee (Orlando, FL); Chai, Guangyu (Orlando, FL); Schenkel, Thomas (San Francisco, CA)

2010-07-06T23:59:59.000Z

434

Fabrication of glass microspheres with conducting surfaces  

DOE Patents [OSTI]

A method for making hollow glass microspheres with conducting surfaces by adding a conducting vapor to a region of the glass fabrication furnace. As droplets or particles of glass forming material pass through multiple zones of different temperature in a glass fabrication furnace, and are transformed into hollow glass microspheres, the microspheres pass through a region of conducting vapor, forming a conducting coating on the surface of the microspheres.

Elsholz, William E. (Acampo, CA)

1984-01-01T23:59:59.000Z

435

Picosecond response of gallium-nitride metalsemiconductormetal photodetectors  

Science Journals Connector (OSTI)

Metalsemiconductormetal ultraviolet photodiodes fabricated on GaN were tested in the picosecond regime with an electro-optic sampling system. A device with a feature size of 1 ?m showed a response with 1.4 ps rise time and 3.5 ps full width at half maximum. The derived electron velocity 1.4310 7 ? cm/s is in good agreement with independent photoexcitation measurements. A slower impulse response was observed in a device with smaller feature size of 0.5?? m .

Jianliang Li; Ying Xu; T. Y. Hsiang; W. R. Donaldson

2004-01-01T23:59:59.000Z

436

Synthesis, crystal structures and properties of three new mixed-ligand d{sup 10} metal complexes constructed from pyridinecarboxylate and in situ generated amino-tetrazole ligand  

SciTech Connect (OSTI)

Three new metal-organic frameworks, [Zn(atz)(nic)]{sub n}(1), [Zn(atz)(isonic)]{sub n}.nHisonic(2) and [Cd(atz)(isonic)]{sub n}(3) (Hnic=nicotinic acid, Hisonic=isonicotinic acid), have been firstly synthesized by employing mixed-ligand of pyridinecarboxylate with the in situ generated ligand of 5-amino-tetrazolate(atz{sup -}), and characterized by elemental analysis, IR spectroscopy, TGA and single crystal X-ray diffraction. The results revealed that 1 presents a two-dimensional (2D) 'sql' topological network constructed from the linear chain subunit of Zn(nic){sub 2} and atz{sup -} ligand. A remarkable feature of 2 is a 2-fold interpenetrated diamondoid network with free Hisonic molecules locating in the channels formed by the zigzag chain subunits of Zn(isonic){sub 2}. Complex 3 is a 3D non-interpenetrated pillared framework constructed from the double chain subunits of Cd-COO{sup -}Cd. It possesses a rarely observed (4,6)-connected 'fsc' topology. The thermal stabilities and fluorescent properties of the complexes were investigated. All of these complexes exhibited intense fluorescent emissions in the solid state at room temperature. - Graphical abstract: Three new mixed-ligand d{sup 10} metal complexes have been synthesized by employing mixed-ligand synthetic approach. Complex 1 presents a 2D 'sql' topological network. Complex 2 is a 2-fold interpenetrated diamondoid network with microporous channels. Rarely observed (4,6)-connected 'fsc' topological network was found in complex 3.

Liu Dongsheng [State Key Laboratory Breeding Base of Photocatalysis, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou, Fujian 350108 (China); College of Chemistry and Chemical Engineering, Jinggangshan University, Ji'an, Jiangxi 343009 (China); Huang, Xihe [State Key Laboratory Breeding Base of Photocatalysis, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou, Fujian 350108 (China); Huang Changcang, E-mail: changcanghuang@hotmail.co [State Key Laboratory Breeding Base of Photocatalysis, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou, Fujian 350108 (China); Huang Gansheng [State Key Laboratory Breeding Base of Photocatalysis, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou, Fujian 350108 (China); College of Chemistry and Chemical Engineering, Jinggangshan University, Ji'an, Jiangxi 343009 (China); Chen Jianzhong, E-mail: j.z.chen@fzu.edu.c [State Key Laboratory Breeding Base of Photocatalysis, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou, Fujian 350108 (China)

2009-07-15T23:59:59.000Z

437

Combustible structural composites and methods of forming combustible structural composites  

DOE Patents [OSTI]

Combustible structural composites and methods of forming same are disclosed. In an embodiment, a combustible structural composite includes combustible material comprising a fuel metal and a metal oxide. The fuel metal is present in the combustible material at a weight ratio from 1:9 to 1:1 of the fuel metal to the metal oxide. The fuel metal and the metal oxide are capable of exothermically reacting upon application of energy at or above a threshold value to support self-sustaining combustion of the combustible material within the combustible structural composite. Structural-reinforcing fibers are present in the composite at a weight ratio from 1:20 to 10:1 of the structural-reinforcing fibers to the combustible material. Other embodiments and aspects are disclosed.

Daniels, Michael A.; Heaps, Ronald J.; Steffler, Eric D.; Swank, W. David

2013-04-02T23:59:59.000Z

438

Combustible structural composites and methods of forming combustible structural composites  

DOE Patents [OSTI]

Combustible structural composites and methods of forming same are disclosed. In an embodiment, a combustible structural composite includes combustible material comprising a fuel metal and a metal oxide. The fuel metal is present in the combustible material at a weight ratio from 1:9 to 1:1 of the fuel metal to the metal oxide. The fuel metal and the metal oxide are capable of exothermically reacting upon application of energy at or above a threshold value to support self-sustaining combustion of the combustible material within the combustible structural composite. Structural-reinforcing fibers are present in the composite at a weight ratio from 1:20 to 10:1 of the structural-reinforcing fibers to the combustible material. Other embodiments and aspects are disclosed.

Daniels, Michael A. (Idaho Falls, ID); Heaps, Ronald J. (Idaho Falls, ID); Steffler, Eric D (Idaho Falls, ID); Swank, William D. (Idaho Falls, ID)

2011-08-30T23:59:59.000Z

439

Characterization of Effect of Support Structures in Laser Additive Manufacturing of Stainless Steel  

Science Journals Connector (OSTI)

Abstract Laser additive manufacturing (LAM) of stainless steel is a layer wisetechnology for fabricating 3D parts from metal powder via selectively melting powder with laser beam. Support structures play a significant role in LAM process as they help to remove heat away from the process and on the other hand hold the work piece in its place. A successful design of support structures can help to achievea building process fast and inexpensive with high quality. Aimof this study was to characterize the usability of two types of support structures: web and tube supports. Purpose of this studywas also to analyze how suitable they are in two industrial application cases: case for dental application and case for jewelry application. It was concluded that the removability of web supports was much better than tube supports. It was noticed that support structures are an important part of LAM process and they strongly affect the manufacturability and the end quality of the part.

Jukka-Pekka Jrvinen; Ville Matilainen; Xiaoyun Li; Heidi Piili; Antti Salminen; Ismo Mkel; Olli Nyrhil

2014-01-01T23:59:59.000Z

440

Double-metal-gate nanocrystalline Si thin film transistors with flexible threshold voltage controllability  

SciTech Connect (OSTI)

We fabricated nano-crystalline Si (nc-Si:H) thin-film transistors (TFTs) with a double-metal-gate structure, which showed a high electron-mobility (?{sub FE}) and adjustable threshold voltages (V{sub th}). The nc-Si:H channel and source/drain (S/D) of the multilayered TFT were deposited at 375?C by inductively coupled plasma chemical vapor deposition. The low grain-boundary defect density of the channel layer is responsible for the high ?{sub FE} of 370 cm{sup 2}/V-s, a steep subthreshold slope of 90?mV/decade, and a low V{sub th} of ?0.64?V. When biased with the double-gate driving mode, the device shows a tunable V{sub th} value extending from ?1?V up to 2.7?V.

Chiou, Uio-Pu; Pan, Fu-Ming, E-mail: fmpan@faculty.nctu.edu.tw [Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30050, Taiwan (China)] [Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30050, Taiwan (China); Shieh, Jia-Min, E-mail: jmshieh@narlabs.org.tw, E-mail: jmshieh@faculty.nctu.edu.tw [National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan (China) [National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan (China); Departments of Photonics and Institute of Electro-Optical Engineering, National Chiao-Tung University, Hsinchu 30010, Taiwan (China); Yang, Chih-Chao [National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan (China)] [National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan (China); Huang, Wen-Hsien [Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30050, Taiwan (China) [Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30050, Taiwan (China); National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan (China); Kao, Yo-Tsung [Departments of Photonics and Institute of Electro-Optical Engineering, National Chiao-Tung University, Hsinchu 30010, Taiwan (China)] [Departments of Photonics and Institute of Electro-Optical Engineering, National Chiao-Tung University, Hsinchu 30010, Taiwan (China)

2013-11-11T23:59:59.000Z

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


441

US fast reactor materials and structures program  

SciTech Connect (OSTI)

Materials and structures problems are central to many critical issues concerning the economic competitiveness, reliable performance, and safety of liquid metal fast breeder reactor (LMFBR) power plants. The US Department of Energy has sponsored for many years a national LMFBR materials and structures program. The objectives of the program are (1) to provide the technological basis for assuring that LMFBR components and systems will be free from significant structural failures during their design lifetimes and (2) to develop materials, design methods and criteria, materials property data, and procedures - all aimed at providing for broad flexibility in LMFBR component and system design and operation. Technology areas included in the program are high-temperature structural design; seismic design; mechanical properties design data; fabrication; tribology (friction, wear, and self-welding); coolant technology (sodium and steam/water); advanced structural alloys; and nondestructive testing. It is the purpose of this study to indicate briefly for each of the program's technology areas the objective, the scope, and some significant accomplishments. Future directions for the program are also discussed.

Harms, W.O.; Purdy, C.M.

1984-01-01T23:59:59.000Z

442

Magnetism in metal-organic capsules  

SciTech Connect (OSTI)

Nickel and cobalt seamed metal-organic capsules have been isolated and studied using structural, magnetic and computational approaches. Antiferromagnetic exchange in the Ni capsule results from coordination environments enforced by the capsule framework.

Atwood, Jerry L.; Brechin, Euan K; Dalgarno, Scott J.; Inglis, Ross; Jones, Leigh F.; Mossine, Andrew; Paterson, Martin J.; Power, Nicholas P.; Teat, Simon J.

2010-01-07T23:59:59.000Z

443

Complexes of niobium and tantalum containing metal-metal bonds  

SciTech Connect (OSTI)

A new entry into the area of low valent niobium and tantalum complexes containing metal-metal bonds is described. M/sub 2/X/sub 6/ (..mu..-THT)(THF)/sub 2/ complexes, where M = Nb or Ta, X = Cl or Br and THT - tetrahydrothiophene, are conveniently synthesized via the reaction of M/sub 2/M/sub 6/(THT)/sub 3/ with THF (THF = tetrahydrofuran). Unlike M/sub 2/X/sub 6/(THT)/sub 3/, M/sub 2/X/sub 6/(..mu..-THT)(THF)/sub 2/ can be easily reduced by sodium amalgam. In THF and in the presence of THT, complexes of the type M/sub 2/X/sub 6/(..mu..-THT)/sub 3//sup 2 -/ form. Salts of these compounds can also be synthesized directly from the metal pentahalides in a two step, one pot reaction in which M/sub 2/X/sub 6/(THT)/sub 3/ is an intermediate. The M/sub 2/X/sub 6/(..mu..-THT)/sub 3//sup 2 -/ complexes have a face-sharing bioctahedral structure with metal-metal triple bonds, the first reported for niobium or tantalum. These compounds are relatively inert, but (Nb/sub 2/Cl/sub 6/(..mu..-THT)/sub 3//sup 2 -/ does reach with pyridine and with a solution of acetic acid/acetic anhydride. These reactions and those of some of the sodium salts are described. In general, trinuclear complexes of niobium and tantalum are rare, and this type of discrete trinuclear complex, which contains one capping, three bridging and nine terminal ligands, has been seen only once before for the group 5 metals, although many examples of similar group 6 metal complexes are known. Full details of the synthesis and characterization of these complexes are described and an interpretation of their electronic structures is given.

Diebold, M.P.

1987-01-01T23:59:59.000Z

444

Fabrication of superconducting wire using organometallic precursors and infiltration  

SciTech Connect (OSTI)

Organometallic precursors from naphthenic acid and metal nitrates were used for the synthesis of YBCO oxide superconducting compounds. The characteristics of metal naphthenates as organometallic precursors were investigated by IR spectra, viscosity measurements, and infiltration. 123 superconducting compound obtained from 123 naphthenate showed a Tc of 90{degree}K and a rather dense and elongated microstructure. Also, the melting behavior of Ba-cuprates which were used for 123 making was studied. A low-temperature melting process was developed to fabricate silver-sheathed superconducting wire with the powder-in-tube method; flowing argon gas is introduced to the system at 930-945{degree}C to reduce the melting temperature of the 123 compound without silver sheath melting. It resulted in a 90{degree}K Tc superconducting core with dense and locally aligned microstructure. SEM-EDS and XRD analysis, 4-probe resistance and Jc measurements, and carbon-content determinations were carried out to characterize the microstructure, grain alignment, and superconducting properties of the samples.

Lee, Y.J.

1991-01-01T23:59:59.000Z

445

First-principles study of thin magnetic transition-metal silicide films on Si(001) Hua Wu, Peter Kratzer, and Matthias Scheffler  

E-Print Network [OSTI]

First-principles study of thin magnetic transition-metal silicide films on Si(001) Hua Wu, Peter of ferromag- netic FM materials have been suggested for the fabrication of metal/semiconductor heterojunctions s : 75.70. i, 73.20.At, 68.35.Md I. INTRODUCTION Metal-semiconductor heterojunctions have received much

446

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

447

Photoelectron Imaging Spectroscopic Investigations of Transition Metal Silicides and Oxides.  

E-Print Network [OSTI]

??This dissertation presents the experimental progress in the use of photoelectron imaging spectroscopy to probe the electronic structure of negatively charged transition metal silicides and (more)

Gunaratne, K. Don

2012-01-01T23:59:59.000Z

448

X-ray absorption fine structure and magnetization characterization...  

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

characterization of the metallic Co component in Co-doped ZnO thin films . X-ray absorption fine structure and magnetization characterization of the metallic Co...

449

Electron-electron scattering in metal-insulator-metal sandwiches  

Science Journals Connector (OSTI)

We have studied weak localization and electron-electron interaction effects in samples consisting of two thin metal films separated by an insulating layer of SiO. When the SiO thickness was less than about 200 , the electron-electron scattering rate was enhanced with respect to that found in isolated, i.e., well-separated, films. This suggests that in the sandwich structures, electrons in one metal film are able to communicate with, i.e., scatter from, electrons in the other film across distances of order 200 , and that this process enhances the phase-breaking rate.

N. Giordano and N. R. Dilley

1993-08-15T23:59:59.000Z

450

Accelerating Structure design and fabrication For KIPT and PAL XFEL  

E-Print Network [OSTI]

ANL and the National Science Center "Kharkov Institute of Physics Technology" (NSC KIPT, Kharkov, Ukraine) jointly proposed to design and build a 100MeV/100KW linear accelerator which will be used to drive the neutron source subcritical assembly. Now the linac was almost assembled in KIPT by the team from Institute of High Energy Physics (IHEP, Beijing, China). The design and measurement result of the accelerating system of the linac will be described in this paper.

Hou, Mi; Pei, Shilun

2014-01-01T23:59:59.000Z

451

Fabrication of Ceramic Microscale Structures and Paul J. A. Kenisw  

E-Print Network [OSTI]

resistance. They are commonly used as the material of choice for gas turbines,18,19 engine propellers,20

Kenis, Paul J. A.

452

Microminiature optical waveguide structure and method for fabrication  

DOE Patents [OSTI]

A method for manufacturing low-cost, nearly circular cross section waveguides comprises starting with a substrate material that a molten waveguide material can not wet or coat. A thin layer is deposited of an opposite material that the molten waveguide material will wet and is patterned to describe the desired surface-contact path pedestals for a waveguide. A waveguide material, e.g., polymer or doped silica, is deposited. A resist material is deposited and unwanted excess is removed to form pattern masks. The waveguide material is etched away to form waveguide precursors and the masks are removed. Heat is applied to reflow the waveguide precursors into near-circular cross-section waveguides that sit atop the pedestals. The waveguide material naturally forms nearly circular cross sections due to the surface tension effects. After cooling, the waveguides will maintain the round shape. If the width and length are the same, then spherical ball lenses are formed. Alternatively, the pedestals can be patterned to taper along their lengths on the surface of the substrate. This will cause the waveguides to assume a conical taper after reflowing by heat.

Strand, Oliver T. (Castro Valley, CA); Deri, Robert J. (Pleasanton, CA); Pocha, Michael D. (Livermore, CA)

1998-01-01T23:59:59.000Z

453

Microminiature optical waveguide structure and method for fabrication  

DOE Patents [OSTI]

A method for manufacturing low-cost, nearly circular cross section waveguides comprises starting with a substrate material that a molten waveguide material can not wet or coat. A thin layer is deposited of an opposite material that the molten waveguide material will wet and is patterned to describe the desired surface-contact path pedestals for a waveguide. A waveguide material, e.g., polymer or doped silica, is deposited. A resist material is deposited and unwanted excess is removed to form pattern masks. The waveguide material is etched away to form waveguide precursors and the masks are removed. Heat is applied to reflow the waveguide precursors into near-circular cross-section waveguides that sit atop the pedestals. The waveguide material naturally forms nearly circular cross sections due to the surface tension effects. After cooling, the waveguides will maintain the round shape. If the width and length are the same, then spherical ball lenses are formed. Alternatively, the pedestals can be patterned to taper along their lengths on the surface of the substrate. This will cause the waveguides to assume a conical taper after reflowing by heat. 32 figs.

Strand, O.T.; Deri, R.J.; Pocha, M.D.

1998-12-08T23:59:59.000Z

454

Metal-phosphate binders  

DOE Patents [OSTI]

A metal-phosphate binder is provided. The binder may include an aqueous phosphoric acid solution, a metal-cation donor including a metal other than aluminum, an aluminum-cation donor, and a non-carbohydrate electron donor.

Howe, Beth Ann [Lewistown, IL; Chaps-Cabrera, Jesus Guadalupe [Coahuila, MX

2009-05-12T23:59:59.000Z

455

Reactive cluster model of metallic glasses  

SciTech Connect (OSTI)

Though discovered more than a half century ago metallic glasses remain a scientific enigma. Unlike crystalline metals, characterized by short, medium, and long-range order, in metallic glasses short and medium-range order persist, though long-range order is absent. This fact has prompted research to develop structural descriptions of metallic glasses. Among these are cluster-based models that attribute amorphous structure to the existence of clusters that are incommensurate with crystalline periodicity. Not addressed, however, are the chemical factors stabilizing these clusters and promoting their interconnections. We have found that glass formers are characterized by a rich cluster chemistry that above the glass transformation temperature promotes exchange as well as static and vibronic sharing of atoms between clusters. The vibronic mechanism induces correlated motions between neighboring clusters and we hypothesize that the distance over which these motions are correlated mediates metallic glass stability and influences critical cooling rates.

Jones, Travis E. [Molecular Theory Group, Colorado School of Mines, Golden, Colorado 80401 (United States) [Molecular Theory Group, Colorado School of Mines, Golden, Colorado 80401 (United States); School of Physics, The University of Sydney, Sydney, New South Wales 2006 (Australia); Miorelli, Jonathan; Eberhart, Mark E. [Molecular Theory Group, Colorado School of Mines, Golden, Colorado 80401 (United States)] [Molecular Theory Group, Colorado School of Mines, Golden, Colorado 80401 (United States)

2014-02-28T23:59:59.000Z

456

Emerging Applications of Liquid Metals Featuring Surface Oxides  

Science Journals Connector (OSTI)

Figure 4. 3D printing of free-standing liquid metal structures. ... Ladd, C.; So, J.-H.; Muth, J.; Dickey, M. D.3D Printing of Free Standing Liquid Metal Microstructures Adv. ... 3D Printing of Free Standing Liquid Metal Microstructures ...

Michael D. Dickey

2014-10-06T23:59:59.000Z

457

Magnetism in amorphous transition metals  

Science Journals Connector (OSTI)

Overall features of magnetism in amorphous transition metals have been investigated on the basis of a finite-temperature theory of the local-environment effect. It is shown that the simple ferromagnetism of Fe, Co, and Ni is drastically changed by structural disorder; amorphous transition metals form spin glasses (SGs) for compositions near amorphous Fe (6.7?N?7.35), ferromagnets for compositions near amorphous Co (7.35?N?9.0), and paramagnetisms for compositions near amorphous Ni (9.0?N?10.0) where N is the number of d electrons. The SG is accompanied by formation of local ferromagnetic clusters for N?7.2, and shows reentrant behavior at the ferromagnetic boundary N?7.35. The ferromagnetism in amorphous transition metals is shown to be well explained by the main-peak position in the noninteracting densities of states. It is found that structural disorder enhances the Curie temperatures (TC) in the range 7.9?N?8.5 as compared with bcc and fcc structures. These results explain recent experimental data for the SG in Fe-rich amorphous alloys and the high TC in amorphous Co-Y alloys, but they are quite different from the early picture obtained for amorphous transition-metalmetalloid alloys.

Y. Kakehashi

1991-05-01T23:59:59.000Z

458

Metal Hydrides - Science Needs  

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

Storage Grand Challenge Pre-Solicitation Meeting, June 19, 2003 1 Metal Hydrides - Science Needs TRADITIONAL METALLIC HYDRIDES: 1.5 to 2 wt.% H. Well studied. COMPLEX...

459

Probing metal solidification nondestructively  

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

Probing metal solidification nondestructively This is the first time that high-energy protons have been used to nondestructively image a large metal sample during melting and...

460

Probing metal solidification nondestructively  

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

Probing metal solidification nondestructively This is the first time that high-energy protons have been used to nondestructively image a large metal sample during melting...

Note: This page contains sample records for the topic "fabricated structural metal" 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

Fabrication of microstructures on glass by imprinting in conventional furnace for lab-on-chip application  

Science Journals Connector (OSTI)

Imprinting micro structures on glass in conventional furnace instead of vacuum chamber was carried out using a nickel alloy mold which was fabricated by diode-pumped solid state laser writing. The layout is designed to serve for DNA analysis. In the ... Keywords: Conventional furnace, Glass imprinting, Laser direct writing, Ni alloy mold

Qiuling Chen; Qiuping Chen; Gabriele Maccioni; Adriano Sacco; Sergio Ferrero; Luciano Scaltrito

2012-07-01T23:59:59.000Z

462

NDE research focuses on questions such as: How do fabrication, growth, andlor processing  

E-Print Network [OSTI]

NDE research focuses on questions such as: How do fabrication, growth, andlor processing contribute-structural properties affect overall thermal, mechanical, electrical, and optical behavior? WILLIAM & MARY NDE Nondestructive Evaluation (NDE) is an interdisciplinary field of study that is concerned with the development

Lewis, Robert Michael

463

Nano-compact disks with 400 Gbit/in2 storage density fabricated  

E-Print Network [OSTI]

Nano-compact disks with 400 Gbit/in2 storage density fabricated using nanoimprint lithography and read with proximal probe Peter R. Kraussa) and Stephen Y. Choub) NanoStructure Laboratory, Department for publication 30 September 1997 Nano-compact disks Nano-CDs with 400 Gbit/in2 topographical bit density nearly

464

Controlled atmosphere for fabrication of cermet electrodes  

DOE Patents [OSTI]

A process for making an inert electrode composite wherein a metal oxide and a metal are reacted in a gaseous atmosphere at an elevated temperature of at least about 750.degree. C. The metal oxide is at least one of the nickel, iron, tin, zinc and zirconium oxides and the metal is copper, silver, a mixture of copper and silver or a copper-silver alloy. The gaseous atmosphere has an oxygen content that is controlled at about 5-3000 ppm in order to obtain a desired composition in the resulting composite.

Ray, Siba P. (Murrysville, PA); Woods, Robert W. (New Kensington, PA)

1998-01-01T23:59:59.000Z

465

METAL MEDIA FILTERS, AG-1 SECTION FI  

SciTech Connect (OSTI)

One application of metal media filters is in various nuclear air cleaning processes including applications for protecting workers, the public and the environment from hazardous and radioactive particles. To support this application the development of the ASME AG-1 FI Standard on Metal Media has been under way for more than ten years. Development of the proposed section has required resolving several difficult issues associated with operating conditions (media velocity, pressure drop, etc.), qualification testing, and quality acceptance testing. Performance characteristics of metal media are dramatically different than the glass fiber media with respect to parameters like differential pressures, operating temperatures, media strength, etc. These differences make existing data for a glass fiber media inadequate for qualifying a metal media filter for AG-1. In the past much work has been conducted on metal media filters at facilities such as Lawrence Livermore National Laboratory (LLNL) and Savannah River National Laboratory (SRNL) to qualify the media as High Efficiency Particulate Air (HEPA) Filters. Particle retention testing has been conducted at Oak Ridge Filter Test Facility and at Air Techniques International (ATI) to prove that the metal media meets or exceeds the 99.97% particle retention required for a HEPA Filter. Even with his testing, data was lacking to complete an AG-1 FI Standard on metal media. With funding secured by Mississippi State University (MSU) from National Nuclear Security Administration (NNSA), a research test stand is being designed and fabricated at MSU's Institute for Clean Energy Technology (ICET) Facility to obtain qualification data on metal media. This in turn will support required data needed for the FI Standard. The paper will discuss in detail how the test stand at MSU will obtain the necessary data to complete the FI Standard.

Adamson, D.

2012-05-23T23:59:59.000Z

466

Method and apparatus for atomization and spraying of molten metals  

DOE Patents [OSTI]

A method and device for dispersing molten metal into fine particulate spray, the method comprises applying an electric current through the molten metal and simultaneously applying a magnetic field to the molten metal in a plane perpendicular to the electric current, whereby the molten metal is caused to form into droplets at an angle perpendicular to both the electric current and the magnetic field. The device comprises a structure for providing a molten metal, appropriately arranged electrodes for applying an electric current through the molten metal, and a magnet for providing a magnetic field in a plane perpendicular to the electric current. 11 figs.

Hobson, D.O.; Alexeff, I.; Sikka, V.K.

1988-07-19T23:59:59.000Z

467

Trending: Metal Oxo Bonds  

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

Trending: Metal Oxo Bonds Trending: Metal Oxo Bonds Trending: Metal Oxo Bonds Print Wednesday, 29 May 2013 00:00 Metal oxides are important for scientific and technical applications in a variety of disciplines, including materials science, chemistry, and biology. Highly covalent metal-oxygen multiple bonds (metal oxos) are the building blocks of metal oxides and have a bearing on the oxide's desirable chemical, magnetic, electronic, and thermal properties. The lack of a more sophisticated grasp of bonding in metal oxides constitutes a roadblock to innovation in a wide variety of important emergent technologies, including industrial catalysis, biomimetic transformations, and artificial photosynthesis. To address this problem, a research team from four national laboratories, three Department of Energy synchrotron user facilities, and the University of Washington has applied spectroscopic and computational analyses to a number of metal oxides, quantifying trends in metal oxo bonding for groups of metals across the periodic table.

468

Reaction-Forming Method for Producing Near Net-Shape Refractory Metal Carbides  

DOE Patents [OSTI]

A method for reaction forming refractory metal carbides. The method involves the fabrication of a glassy carbon preform by casting an organic, resin-based liquid mixture into a mold and subsequently heat treating it in two steps, which cures and pyrolizes the resin resulting in a porous carbon preform. By varying the amounts of the constituents in the organic, resin-based liquid mixture, control over the density of the carbon preform is obtained. Control of the density and microstructure of the carbon preform allows for determination of the microstructure and properties of the refractory metal carbide material produced. The glassy carbon preform is placed on a bed of refractory metal or refractory metal--silicon alloy. The pieces are heated above the melting point of the metal or alloy. The molten metal wicks inside the porous carbon preform and reacts, forming the refractory metal carbide or refractory metal carbide plus a minor secondary phase.

Palmisiano, Marc N.; Jakubenas, Kevin J.; Baranwal, Rita

2004-07-20T23:59:59.000Z

469

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

SciTech Connect (OSTI)

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

Marzik, James, V.

2005-10-13T23:59:59.000Z

470

Controlled deposition of sulphur-containing semiconductor and dielectric nano-structured films on metals in SF{sub 6} ion-ion plasma  

SciTech Connect (OSTI)

In the present paper, the deposition processes and formation of films in SF{sub 6} ion-ion plasma, with positive and negative ion flows accelerated to the surface, are investigated. The PEGASES (acronym for Plasma Propulsion with Electronegative GASES) source is used as an ion-ion plasma source capable of generating almost ideal ion-ion plasma with negative ion to electron density ratio more than 2500. It is shown that film deposition in SF{sub 6} ion-ion plasma is very sensitive to the polarity of the incoming ions. The effect is observed for Cu, W, and Pt materials. The films formed on Cu electrodes during negative and positive ion assisted deposition were analyzed. Scanning electron microscope analysis has shown that both positive and negative ion fluxes influence the copper surface and leads to film formation, but with different structures of the surface: the low-energy positive ion bombardment causes the formation of a nano-pored film transparent for ions, while the negative ion bombardment leads to a continuous smooth insulating film. The transversal size of the pores in the porous film varies in the range 50500 nm, and further analysis of the film has shown that the film forms a diode together with the substrate preventing positive charge drain, and positive ions are neutralized by passing through the nano-pores. The film obtained with the negative ion bombardment has an insulating surface, but probably with a multi-layer structure: destroying the top surface layer allows to measure similar diode IV-characteristics as for the nano-pored film case. Basing on results, practical conclusions for the probes and electrodes cleaning in ion-ion SF{sub 6} plasmas have been made. Different applications are proposed for the discovered features of the controlled deposition from ion-ion plasmas, from Li-sulphur rechargeable batteries manufacturing and nanofluidics issues to the applications for microelectronics, including low-k materials formation.

Rafalskyi, Dmytro; Bredin, Jrme; Aanesland, Ane [LPP, CNRSEcole Polytechnique, 91128 Palaiseau cedex (France)] [LPP, CNRSEcole Polytechnique, 91128 Palaiseau cedex (France)

2013-12-07T23:59:59.000Z

471

Semiconductor device PN junction fabrication using optical processing of amorphous semiconductor material  

DOE Patents [OSTI]

Systems and methods for semiconductor device PN junction fabrication are provided. In one embodiment, a method for fabricating an electrical device having a P-N junction comprises: depositing a layer of amorphous semiconductor material onto a crystalline semiconductor base, wherein the crystalline semiconductor base comprises a crystalline phase of a same semiconductor as the amorphous layer; and growing the layer of amorphous semiconductor material into a layer of crystalline semiconductor material that is epitaxially matched to the lattice structure of the crystalline semiconductor base by applying an optical energy that penetrates at least the amorphous semiconductor material.

Sopori, Bhushan; Rangappan, Anikara

2014-11-25T23:59:59.000Z

472

Excimer-laser surface treatment of metals for improved adhesion  

Science Journals Connector (OSTI)

Excimer-laser-induced ablation has been used to produce surface structuring of various metals. Such structuring contributed to a 515% enhancement of the bonding strength of these...

Henari, Fryad; Blau, Werner

1995-01-01T23:59:59.000Z

473

Heavy metal biosensor  

DOE Patents [OSTI]

Compositions and methods are provided for detection of certain heavy metals using bacterial whole cell biosensors.

Hillson, Nathan J; Shapiro, Lucille; Hu, Ping; Andersen, Gary L

2014-04-15T23:59:59.000Z

474

Method of fabricating a solar cell  

DOE Patents [OSTI]

Methods of fabricating solar cells are described. A porous layer may be formed on a surface of a substrate, the porous layer including a plurality of particles and a plurality of voids. A solution may be dispensed into one or more regions of the porous layer to provide a patterned composite layer. The substrate may then be heated.

Pass, Thomas; Rogers, Robert

2014-02-25T23:59:59.000Z

475

Method of fabrication of anchored nanostructure materials  

SciTech Connect (OSTI)

Methods for fabricating anchored nanostructure materials are described. The methods include heating a nano-catalyst under a protective atmosphere to a temperature ranging from about 450.degree. C. to about 1500.degree. C. and contacting the heated nano-catalysts with an organic vapor to affix carbon nanostructures to the nano-catalysts and form the anchored nanostructure material.

Seals, Roland D; Menchhofer, Paul A; Howe, Jane Y; Wang, Wei

2013-11-26T23:59:59.000Z

476

Environmentally Benign Flame Retardant Nanocoatings for Fabric  

E-Print Network [OSTI]

testing. A silica-like sheath was formed after burning that protected the fibers. Finally, the first intumescent LbL assembly was deposited on cotton fabric. SEM images show significant bubble formation on fibers, coated with a 0.5 wt percent PAAm/1 wt...

Li, Yu-Chin

2012-07-16T23:59:59.000Z

477

Materials Processing and Product Fabrication Course Description  

E-Print Network [OSTI]

/P/M Process Demo (1/2) 5 Monday, April 2 Machining/EDM/Die Fabrication (1/2) 6 Wednesday, April 4 Process. The course will concentrate on basic material processing techniques (i.e. casting, machining, and joining Wednesday, April 25 Project ­ Machining 13 Monday, April 30 Exam 14 Wednesday, May 2 Presentations #12;

478

Exploration of R2XM2 (R=Sc, Y, Ti, Zr, Hf, rare earth; X=main group element; M=transition metal, Si, Ge): Structural Motifs, the novel Compound Gd2AlGe2 and Analysis of the U3Si2 and Zr3Al2 Structure Types  

SciTech Connect (OSTI)

In the process of exploring and understanding the influence of crystal structure on the system of compounds with the composition Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} several new compounds were synthesized with different crystal structures, but similar structural features. In Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4}, the main feature of interest is the magnetocaloric effect (MCE), which allows the material to be useful in magnetic refrigeration applications. The MCE is based on the magnetic interactions of the Gd atoms in the crystal structure, which varies with x (the amount of Si in the compound). The crystal structure of Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} can be thought of as being formed from two 3{sup 2}434 nets of Gd atoms, with additional Gd atoms in the cubic voids and Si/Ge atoms in the trigonal prismatic voids. Attempts were made to substitute nonmagnetic atoms for magnetic Gd using In, Mg and Al. Gd{sub 2}MgGe{sub 2} and Gd{sub 2}InGe{sub 2} both possess the same 3{sup 2}434 nets of Gd atoms as Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4}, but these nets are connected differently, forming the Mo{sub 2}FeB{sub 2} crystal structure. A search of the literature revealed that compounds with the composition R{sub 2}XM{sub 2} (R=Sc, Y, Ti, Zr, Hf, rare earth; X=main group element; M=transition metal, Si, Ge) crystallize in one of four crystal structures: the Mo{sub 2}FeB{sub 2}, Zr{sub 3}Al{sub 2}, Mn{sub 2}AlB{sub 2} and W{sub 2}CoB{sub 2} crystal structures. These crystal structures are described, and the relationships between them are highlighted. Gd{sub 2}AlGe{sub 2} forms an entirely new crystal structure, and the details of its synthesis and characterization are given. Electronic structure calculations are performed to understand the nature of bonding in this compound and how electrons can be accounted for. A series of electronic structure calculations were performed on models with the U{sub 3}Si{sub 2} and Zr{sub 3}Al{sub 2} structures, using Zr and A1 as the building blocks. The starting point for these models was the U{sub 3}Si{sub 2} structure, and models were created to simulate the transition from the idealized U{sub 3}Si{sub 2} structure to the distorted Zr{sub 3}Al{sub 2} structure. Analysis of the band structures of the models has shown that the transition from the U{sub 3}Si{sub 2} structure to the Zr{sub 3}Al{sub 2} structure lifts degeneracies along the {Lambda} {yields} Z direction, indicating a Peierls-type mechanism for the displacement occurring in the positions of the Zr atoms.

Sean William McWhorter

2006-05-01T23:59:59.000Z

479

Development of high performance sodium/metal chloride cells  

SciTech Connect (OSTI)

Sodium/metal chloride (MCl{sub 2}) cells and batteries are being studied at Argonne National Laboratory (ANL) for stationary energy storage and transportation applications. The work is being directed toward (1) development of thin, high-capacity density electrodes and inexpensive {beta}{double prime}-alumina-glass composite electrolyte materials to replace {beta}{double prime}-alumina and (2) the development of models to project MCl{sub 2} system performances. In our NiCl{sub 2} electrode work, the effects of charge/discharge rates, temperature, electrode porosity, and sulfur content on electrode performance were determined using annular electrodes fabricated in the uncharged state. Of all electrode design parameters mentioned, electrode porosity, sulfur content, and charge rates have the greatest effect on utilization and on the area-specific impedance. The {beta}{double prime}-alumina-glass composite electrolyte work has led to the development of a highly conductive (3.3 {times} 10{sup {minus}2}S/cm at 250{degree}C) composite material. Preliminary modeling studies indicate that the performance of the MCl{sub 2} electrodes can be fitted by a mathematic model very successfully and that cell electrolyte configurations of either multiple tubes joined at a header or compartmented flat structures of either {beta}{double prime}-alumina or of the composite material would result in high-performance batteries with power-to-energy ratios of about 5. 15 refs., 8 figs., 4 tabs.

Vissers, D.R.; Bloom, I.D.; Hash, M.C.; Redey, L.; Hammer, C.L.; Dees, D.W.; Nelson, P.A.

1990-01-01T23:59:59.000Z

480

Fuel Fabrication Capability Research and Development Plan  

SciTech Connect (OSTI)

The purpose of this document is to provide a comprehensive review of the mission of the Fuel Fabrication Capability (FFC) within the Global Threat Reduction Initiative Convert Program, along with research and development (R&D) needs that have been identified as necessary to ensuring mission success. The design and fabrication of successful nuclear fuels must be closely linked endeavors. Therefore, the overriding motivation behind the FFC R&D program described in this plan is to foster closer integration between fuel design and fabrication to reduce programmatic risk. These motivating factors are all interrelated, and progress addressing one will aid understanding of the others. The FFC R&D needs fall into two principal categories, 1) baseline process optimization, to refine the existing fabrication technologies, and 2) manufacturing process alternatives, to evaluate new fabrication technologies that could provide improvements in quality, repeatability, material utilization, or cost. The FFC R&D Plan examines efforts currently under way in regard to coupon, foil, plate, and fuel element manufacturing, and provides recommendations for a number of R&D topics that are of high priority but not currently funded (i.e., knowledge gaps). The plan ties all FFC R&D efforts into a unified vision that supports the overall Convert Program schedule in general, and the fabrication schedule leading up to the MP-1 and FSP-1 irradiation experiments specifically. The fabrication technology decision gates and down-selection logic and schedules are tied to the schedule for fabricating the MP-1 fuel plates, which will provide the necessary data to make a final fuel fabrication process down-selection. Because of the short turnaround between MP-1 and the follow-on FSP-1 and MP-2 experiments, the suite of specimen types that will be available for MP-1 will be the same as those available for FSP-1 and MP-2. Therefore, the only opportunity to explore parameter space and alternative processing is between now and 2016 when the candidate processes are down-selected in preparation for the MP-1, FSP-1, and MP-2 plate manufacturing campaigns. A number of key risks identified by the FFC are discussed in this plan, with recommended mitigating actions for those activities within FFC, and identification of risks that are impacted by activities in other areas of the Convert Program. The R&D Plan does not include discussion of FFC initiatives related to production-scale manufacturing of fuel (e.g., establishment of the Pilot Line Production Facility), rather, the goal of this plan is to document the R&D activities needed ultimately to enable high-quality and cost-effective production of the fuel by the commercial fuel fabricator. The intent is for this R&D Plan to be a living document that will be reviewed and updated on a regular basis (e.g., annually) to ensure that FFC R&D activities remain properly aligned to the needs of the Convert Program. This version of the R&D Plan represents the first annual review and revision.

Senor, David J.; Burkes, Douglas

2014-04-17T23:59:59.000Z

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481

Trending: Metal Oxo Bonds  

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

Trending: Metal Oxo Bonds Print Trending: Metal Oxo Bonds Print Metal oxides are important for scientific and technical applications in a variety of disciplines, including materials science, chemistry, and biology. Highly covalent metal-oxygen multiple bonds (metal oxos) are the building blocks of metal oxides and have a bearing on the oxide's desirable chemical, magnetic, electronic, and thermal properties. The lack of a more sophisticated grasp of bonding in metal oxides constitutes a roadblock to innovation in a wide variety of important emergent technologies, including industrial catalysis, biomimetic transformations, and artificial photosynthesis. To address this problem, a research team from four national laboratories, three Department of Energy synchrotron user facilities, and the University of Washington has applied spectroscopic and computational analyses to a number of metal oxides, quantifying trends in metal oxo bonding for groups of metals