Sample records for diamond thrust bearings

  1. Well drilling tool with diamond radial/thrust bearings

    SciTech Connect (OSTI)

    Nagel, D.D.; Aparicio, T. Jr.

    1983-10-18T23:59:59.000Z

    A turbodrill is disclosed for connection to a drill string and has a rotating shaft for turning a drill bit. The turbodrill has rotor and stator blades operated by drilling mud flowing therethrough to rotate the shaft. The shaft is provided with radial/thrust bearing consisting of a pair of annular plates, each of which has conical surfaces supporting a plurality of friction bearing members of polycrystalline diamond. The radial and thrust loads are carried by the wear-resistant diamond bearing surfaces. The bearing members are preferably cylindrical studs having flat faces with flat disc-shaped diamond bearing members supported thereon around the adjacent surfaces of the supporting plates. The faces of the diamond bearings will wear into smoothly mating conical bearing surfaces with use. There are two or more pairs of diamond radial/thrust bearings to handle longitudinal as well as radial loads. The use of the diamond radial/thrust bearings makes it possible to eliminate the lubricant-flooded construction of prior art turbodrills and allow the bearings to be cooled and lubricated be drilling fluid flowing therethrough. The diamond radial/thrust bearings may be used with lubricant-flooded turbodrills and with other types of downhole motor driven drills such as drills driven by positive displacement motors.

  2. US Synthetic Corp (TRL 4 Component)- The Development of Open, Water Lubricated Polycrystalline Diamond Thrust Bearings for use in Marine Hydrokinetic (MHK) Energy Machines

    Broader source: Energy.gov [DOE]

    US Synthetic Corp (TRL 4 Component) - The Development of Open, Water Lubricated Polycrystalline Diamond Thrust Bearings for use in Marine Hydrokinetic (MHK) Energy Machines

  3. The Development of Open Water-lubricated Polycrystalline Diamond (PCD) Thrust Bearings for Use in Marine Hydrokinetic (MHK) Energy Machines

    SciTech Connect (OSTI)

    Cooley, Craig, H.; Khonsari, Michael,, M; Lingwall, Brent

    2012-11-28T23:59:59.000Z

    Polycrstalline diamond (PCD) bearings were designed, fabricated and tested for marine-hydro-kinetic (MHK) application. Bearing efficiency and life were evaluated using the US Synthetic bearing test facility. Three iterations of design, build and test were conducted to arrive at the best bearing design. In addition life testing that simulated the starting and stopping and the loading of real MHK applications were performed. Results showed polycrystalline diamond bearings are well suited for MHK applications and that diamond bearing technology is TRL4 ready. Based on life tests results bearing life is estimated to be at least 11.5 years. A calculation method for evaluating the performance of diamond bearings of round geometry was also investigated and developed. Finally, as part of this effort test bearings were supplied free of charge to the University of Alaska for further evaluation. The University of Alaska test program will subject the diamond bearings to sediment laden lubricating fluid.

  4. Computational analysis of spiral groove thrust bearings and face seals

    E-Print Network [OSTI]

    Zirkelback, Nicole Lisa

    1997-01-01T23:59:59.000Z

    Analyses for incompressible and compressible spiral groove thrust bearings (SGTBS) and face seals (SGFSS) are presented. A successive approximation linearizes the partial differential equation of pressure that arises in the compressible fluid...

  5. Design of high temperature high speed electromagnetic axial thrust bearing

    E-Print Network [OSTI]

    Mohiuddin, Mohammad Waqar

    2002-01-01T23:59:59.000Z

    DESIGN OF HIGH TEMPERATURE HIGH SPEED ELECTROMAGNETIC AXIAL THRUST BEARING A Thesis by MOHAMMAD WAQAR MOHIUDDIN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE December 2002 Major Subject: Mechanical Engineering DESIGN OF HIGH TEMPERATURE HIGH SPEED ELECTROMAGNETIC AXIAL THRUST BEARING A Thesis by MOHAMMAD WAQAR MOHIUDDIN Submitted to Texas A&M University in partial fulfillment...

  6. Test-Theory Correlation Study for an Ultra High Temperature Thrust Magnetic Bearing

    E-Print Network [OSTI]

    Desireddy, Vijesh R.

    2010-01-14T23:59:59.000Z

    Magnetic bearings have been researched by the National Aeronautics and Space Administration (NASA) for a very long time to be used in wide applications. This research was to assemble and test an axial thrust electromagnetic bearing, which can handle...

  7. A comparison of eddy current effects in a single sided magnetic thrust bearing

    E-Print Network [OSTI]

    DeWeese, Randall Thomas

    1996-01-01T23:59:59.000Z

    finite element studies of magnetic thrust bearings using static bench testing procedures to investigate configurations that promote eddy current reduction. Several rotor/stator configurations, including solid metal, laminated washers, tapewound lam...

  8. Method of forming fluorine-bearing diamond layer on substrates, including tool substrates

    DOE Patents [OSTI]

    Chang, R. P. H. (Glenview, IL); Grannen, Kevin J. (Evanston, IL)

    2002-01-01T23:59:59.000Z

    A method of forming a fluorine-bearing diamond layer on non-diamond substrates, especially on tool substrates comprising a metal matrix and hard particles, such as tungsten carbide particles, in the metal matrix. The substrate and a fluorine-bearing plasma or other gas are then contacted under temperature and pressure conditions effective to nucleate fluorine-bearing diamond on the substrate. A tool insert substrate is treated prior to the diamond nucleation and growth operation by etching both the metal matrix and the hard particles using suitable etchants.

  9. Test-Theory Correlation Study for an Ultra High Temperature Thrust Magnetic Bearing 

    E-Print Network [OSTI]

    Desireddy, Vijesh R.

    2010-01-14T23:59:59.000Z

    between bearing force, applied current and temperature. The thesis incorporates the assembly, testing of the electromagnetic bearing at various speeds and temperatures and compare predicted to measured force vs. speed, current, gap and temperature...

  10. Measuring axial pump thrust

    DOE Patents [OSTI]

    Suchoza, B.P.; Becse, I.

    1988-11-08T23:59:59.000Z

    An apparatus for measuring the hydraulic axial thrust of a pump under operation conditions is disclosed. The axial thrust is determined by forcing the rotating impeller off of an associated thrust bearing by use of an elongate rod extending coaxially with the pump shaft. The elongate rod contacts an impeller retainer bolt where a bearing is provided. Suitable measuring devices measure when the rod moves to force the impeller off of the associated thrust bearing and the axial force exerted on the rod at that time. The elongate rod is preferably provided in a housing with a heat dissipation mechanism whereby the hot fluid does not affect the measuring devices. 1 fig.

  11. Measuring axial pump thrust

    DOE Patents [OSTI]

    Suchoza, Bernard P. (McMurray, PA); Becse, Imre (Washington, PA)

    1988-01-01T23:59:59.000Z

    An apparatus for measuring the hydraulic axial thrust of a pump under operation conditions is disclosed. The axial thrust is determined by forcing the rotating impeller off of an associated thrust bearing by use of an elongate rod extending coaxially with the pump shaft. The elongate rod contacts an impeller retainer bolt where a bearing is provided. Suitable measuring devices measure when the rod moves to force the impeller off of the associated thrust bearing and the axial force exerted on the rod at that time. The elongate rod is preferably provided in a housing with a heat dissipation mechanism whereby the hot fluid does not affect the measuring devices.

  12. Measurements versus Predictions for a Hybrid (Hydrostatic plus Hydrodynamic Thrust Bearing for a Range of Orifice Diameters

    E-Print Network [OSTI]

    Esser, Paul R.

    2011-08-08T23:59:59.000Z

    bearings with three different orifice diameters (1.63, 1.80, and 1.93 mm) are tested for a range of supply pressures, fluid film thicknesses, and rotational speeds. The water-lubricated test bearings have eight pockets, with feed orifices located centrally...

  13. Phlogopite and Quartz Lamellae in Diamond-bearing Diopside from Marbles of the Kokchetav Massif Kazakhstan: Exsolution or Replacement Reaction

    SciTech Connect (OSTI)

    L Dobrzhinetskaya; R Wirth; D Rhede; Z Liu; H Green

    2011-12-31T23:59:59.000Z

    Exsolution lamellae of pyroxene in garnet (grt), coesite in titanite and omphacite from UHPM terranes are widely accepted as products of decompression. However, interpretation of oriented lamellae of phyllosilicates, framework silicates and oxides as a product of decompression of pyroxene is very often under debate. Results are presented here of FIB-TEM, FEG-EMP and synchrotron-assisted infrared (IR) spectroscopy studies of phlogopite (Phlog) and phlogopite + quartz (Qtz) lamellae in diamond-bearing clinopyroxene (Cpx) from ultra-high pressure (UHP) marble. These techniques allowed collection of three-dimensional information from the grain boundaries of both the single (phlogopite), two-phase lamellae (phlogopite + quartz), and fluid inclusions inside of diamond included in K-rich Cpx and understanding their relationships and mechanisms of formation. The Cpx grains contain in their cores lamellae-I, which are represented by topotactically oriented extremely thin lamellae of phlogopite (that generally are two units cell wide but locally can be seen to be somewhat broader) and microdiamond. The core composition is: (Ca{sub 0.94}K{sub 0.04}Na{sub 0.02})(Al{sub 0.06}Fe{sub 0.08}Mg{sub 0.88})(Si{sub 1.98}Al{sub 0.02})O{sub 6.00}. Fluid inclusions rich in K and Si are recognized in the core of the Cpx, having no visible connections to the lamellae-I. Lamellar-II inclusions consist of micron-size single laths of phlogopite and lens-like quartz or slightly elongated phlogopite + quartz intergrowths; all are situated in the rim zone of the Cpx. The composition of the rim is (Ca{sub 0.95}Fe{sub 0.03}Na{sub 0.02})(Al{sub 0.05}Fe{sub 0.05}Mg{sub 0.90})Si{sub 2}O{sub 6}, and the rim contains more Ca, Mg than the core, with no K there. Such chemical tests support our microstructural observations and conclusion that the phlogopite lamellae-I are exsolved from the K-rich Cpx-precursor during decompression. It is assumed that Cpx-precursor was also enriched in H{sub 2}O, because diamond included in the core of this Cpx contains fluid inclusions. The synchrotron IR spectra of such diamond record the presence of OH{sup -} stretching and H{sub 2}O bending motion regions. Lamellar-II inclusions are interpreted as forming partly because of modification of the lamellae-i in the presence of fluid enriched in K, Fe and Si during deformation of the host diopside; the latter is probably related to the shallower stage of exhumation of the UHP marble. This study emphasizes that in each case to understand the mechanism of lamellar inclusion formation more detailed studies are needed combining both compositional, structural and three-dimensional textural features of lamellar inclusions and their host.

  14. active basement-involved thrust: Topics by E-print Network

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

    the thrust bearing, Hyperco 27 and AISI 4340. And for the shaft Inconel 718 was chosen. A handbook approach is made in chapter IV, to find the stresses developed in the thrust disk...

  15. Down hole drilling motor with pressure balanced bearing seals

    SciTech Connect (OSTI)

    McDonald, W.J.

    1981-01-27T23:59:59.000Z

    A down hole drilling motor, e.g., A turbodrill, which is connected to a string of drill pipe has a rotating shaft for driving a drill bit which may be a rotary bit or a high speed solid head diamond bit. The turbine section has rotor and stator blades which are crescent shaped in cross section with each blade having an exit angle of 14*-23* for maximum turbine efficiency. The bearing shaft is provided with chevron rotary seals positioned below the rotary bearings carrying both radial and vertical thrust. Fluid lubricant fills the space from the rotary seals to a predetermined level above the bearings. A piston seals the lubricant chamber and is pressurized by drilling fluid (I.E. Mud) flowing through the tool. A layer of lubricant fluid overlies the first piston and has a second piston covering said fluid and transmitting pressure from the drilling fluid to the lubricant fluid surrounding the bearings. The drilling mud that causes the turbodrill to rotate is pumped away from the bearing seals by pump means operated by the drilling motor to balance the pressure on the upper and lower bearing seals.

  16. Down hole drilling motor with pressure balanced bearing seals

    SciTech Connect (OSTI)

    Maurer, W.C.

    1980-09-30T23:59:59.000Z

    A downhole drilling motor, e.g., a turbodrill is described, which is connected to a string of drill pipe has a rotating shaft for driving a drill bit which may be a rotary bit or a high speed solid head diamond bit. The turbine section has rotor and stator blades which are crescent shaped in cross section with each blade having an exit angle of 14-23/sup 0/ for maximum turbine efficiency. The drilling motor may alternatively be a positive displacement motor. The bearing shaft is provided with chevron rotary seals positioned below the rotary bearings carrying both radial and vertical thrust. Fluid lubricant fills the space from the rotary seals to a predetermined level above the bearings. A piston seals the lubricant chamber and is pressurized by drilling fluid (i.e. mud) flowing through the tool. A layer of lubricant fluid overlies the first piston and has a second piston covering said fluid and transmitting pressure from the drilling fluid to the lubricant fluid surrounding the bearings. The drilling mud is divided into two streams, one of which rotates the drill bit, and the other of which passes through the drill bit. The pressure drop across the drilling motor equals the pressure drop across the drill bit, thus balancing the pressure on the bearing seals.

  17. The experimental determination of the dynamic radial stiffness of an angular contact ball bearing

    E-Print Network [OSTI]

    Schmidt, Brent Lee

    2001-01-01T23:59:59.000Z

    To evaluate the A. B. Jones bearing stiffness predictions on an angular contact ball bearing, experimental testing on an angular contact ball bearing was conducted. Objectives of the testing were to determine the effects of thrust load, rotational...

  18. Physics Thrust Areas

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible for RenewableSpeedingBiomassPPPOPetroleum ReservesThrust Areas Physics Thrust Areas

  19. Bearing construction for refrigeration compresssor

    DOE Patents [OSTI]

    Middleton, Marc G. (Wyoming, MI); Nelson, Richard T. (Worthington, OH)

    1988-01-01T23:59:59.000Z

    A hermetic refrigeration compressor has a cylinder block and a crankshaft rotatable about a vertical axis to reciprocate a piston in a cylinder on the cylinder block. A separate bearing housing is secured to the central portion of the cylinder block and extends vertically along the crankshaft, where it carries a pair of roller bearings to journal the crankshaft. The crankshaft has a radially extending flange which is journaled by a thrust-type roller bearing above the bearing housing to absorb the vertical forces on the crankshaft so that all three of the roller bearings are between the crankshaft and the bearing housing to maintain and control the close tolerances required by such bearings.

  20. Advanced Diamond Anvil Techniques (Customized Diamond Anvils)

    SciTech Connect (OSTI)

    Weir, S

    2009-02-11T23:59:59.000Z

    A complete set of diamond-based fabrication tools now exists for making a wide range of different types of diamond anvils which are tailored for various high-P applications. Current tools include: CVD diamond deposition (making diamond); Diamond polishing, laser drilling, plasma etching (removal of diamond); and Lithography, 3D laser pantography (patterning features onto diamond); - Metal deposition (putting electrical circuits and metal masks onto diamond). Current applications include the following: Electrical Conductivity; Magnetic Susceptibility; and High-P/High-T. Future applications may include: NMR; Hall Effect; de Haas - Shubnikov (Fermi surface topology); Calorimetry; and thermal conductivity.

  1. Hybrid gas bearings with controlled supply pressure to eliminate rotor vibrations while crossing system critical speeds

    E-Print Network [OSTI]

    Ryu, Keun

    2009-05-15T23:59:59.000Z

    reliable predictive design models. The thrust of this research is to investigate conventional bearings of low cost, easy to manufacture (common materials) and easy to install and align. Flexure pivot tilting pad bearings offer little or no cross...

  2. Load responsive hydrodynamic bearing

    DOE Patents [OSTI]

    Kalsi, Manmohan S. (Houston, TX); Somogyi, Dezso (Sugar Land, TX); Dietle, Lannie L. (Stafford, TX)

    2002-01-01T23:59:59.000Z

    A load responsive hydrodynamic bearing is provided in the form of a thrust bearing or journal bearing for supporting, guiding and lubricating a relatively rotatable member to minimize wear thereof responsive to relative rotation under severe load. In the space between spaced relatively rotatable members and in the presence of a liquid or grease lubricant, one or more continuous ring shaped integral generally circular bearing bodies each define at least one dynamic surface and a plurality of support regions. Each of the support regions defines a static surface which is oriented in generally opposed relation with the dynamic surface for contact with one of the relatively rotatable members. A plurality of flexing regions are defined by the generally circular body of the bearing and are integral with and located between adjacent support regions. Each of the flexing regions has a first beam-like element being connected by an integral flexible hinge with one of the support regions and a second beam-like element having an integral flexible hinge connection with an adjacent support region. A least one local weakening geometry of the flexing region is located intermediate the first and second beam-like elements. In response to application of load from one of the relatively rotatable elements to the bearing, the beam-like elements and the local weakening geometry become flexed, causing the dynamic surface to deform and establish a hydrodynamic geometry for wedging lubricant into the dynamic interface.

  3. CFES RESEARCH THRUSTS: Energy Storage

    E-Print Network [OSTI]

    Lü, James Jian-Qiang

    CFES RESEARCH THRUSTS: Energy Storage Wind Energy Solar Energy Smart Grids Smart Buildings For our with the student to finalize the project plan. To sponsor an Energy Scholar, a company agrees to: · Assign

  4. Electrically conductive diamond electrodes

    DOE Patents [OSTI]

    Swain, Greg (East Lansing, MI); Fischer, Anne (Arlington, VA),; Bennett, Jason (Lansing, MI); Lowe, Michael (Holt, MI)

    2009-05-19T23:59:59.000Z

    An electrically conductive diamond electrode and process for preparation thereof is described. The electrode comprises diamond particles coated with electrically conductive doped diamond preferably by chemical vapor deposition which are held together with a binder. The electrodes are useful for oxidation reduction in gas, such as hydrogen generation by electrolysis.

  5. Diamond and Polycrystalline Diamond for MEMS Applications: Simulations and Experiments

    E-Print Network [OSTI]

    Çagin, Tahir

    Diamond and Polycrystalline Diamond for MEMS Applications: Simulations and Experiments Tahir C¸ a on Silicon and polycrystalline diamond show that this rapid wear is caused by a variety of factors, related processes on diamond surfaces. We studied the atomic friction of diamond (100)­surface employing an extended

  6. Thermally stable diamond brazing

    DOE Patents [OSTI]

    Radtke, Robert P. (Kingwood, TX)

    2009-02-10T23:59:59.000Z

    A cutting element and a method for forming a cutting element is described and shown. The cutting element includes a substrate, a TSP diamond layer, a metal interlayer between the substrate and the diamond layer, and a braze joint securing the diamond layer to the substrate. The thickness of the metal interlayer is determined according to a formula. The formula takes into account the thickness and modulus of elasticity of the metal interlayer and the thickness of the TSP diamond. This prevents the use of a too thin or too thick metal interlayer. A metal interlayer that is too thin is not capable of absorbing enough energy to prevent the TSP diamond from fracturing. A metal interlayer that is too thick may allow the TSP diamond to fracture by reason of bending stress. A coating may be provided between the TSP diamond layer and the metal interlayer. This coating serves as a thermal barrier and to control residual thermal stress.

  7. Diamond tool machining of materials which react with diamond

    DOE Patents [OSTI]

    Lundin, R.L.; Stewart, D.D.; Evans, C.J.

    1992-04-14T23:59:59.000Z

    An apparatus is described for the diamond machining of materials which detrimentally react with diamond cutting tools in which the cutting tool and the workpiece are chilled to very low temperatures. This chilling halts or retards the chemical reaction between the workpiece and the diamond cutting tool so that wear rates of the diamond tool on previously detrimental materials are comparable with the diamond turning of materials which do not react with diamond. 1 figs.

  8. Diamonds: For Ever Or For Everyone?

    E-Print Network [OSTI]

    Tu, Emily

    2009-01-01T23:59:59.000Z

    diamond companies such as Apollo Diamond are bringing forthCuellar 2005). In 2007, Apollo Diamond, a company based inCVD produced diamonds (Apollo Diamond). Using the website,

  9. Thrust bolting: roof bolt support apparatus

    DOE Patents [OSTI]

    Tadolini, Stephen C. (Lakewood, CO); Dolinar, Dennis R. (Golden, CO)

    1992-01-01T23:59:59.000Z

    A method of installing a tensioned roof bolt in a borehole of a rock formation without the aid of a mechanical anchoring device or threaded tensioning threads by applying thrust to the bolt (19) as the bonding material (7') is curing to compress the strata (3) surrounding the borehole (1), and then relieving the thrust when the bonding material (7') has cured.

  10. Diamond nucleation using polyethene

    SciTech Connect (OSTI)

    Morell, Gerardo; Makarov, Vladimir; Varshney, Deepak; Weiner, Brad

    2013-07-23T23:59:59.000Z

    The invention presents a simple, non-destructive and non-abrasive method of diamond nucleation using polyethene. It particularly describes the nucleation of diamond on an electrically viable substrate surface using polyethene via chemical vapor deposition (CVD) technique in a gaseous environment.

  11. Diamond films: Historical perspective

    SciTech Connect (OSTI)

    Messier, R. [Pennsylvania State Univ., University Park (United States)

    1993-01-01T23:59:59.000Z

    This section is a compilation of notes and published international articles about the development of methods of depositing diamond films. Vapor deposition articles are included from American, Russian, and Japanese publications. The international competition to develop new deposition methodologies is stressed. The current status of chemical vapor deposition of diamond is assessed.

  12. Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing

    E-Print Network [OSTI]

    Wilkes, Jason Christopher

    2012-02-14T23:59:59.000Z

    Many researchers have compared predicted stiffness and damping coefficients for tilting-pad journal bearings (TPJBs) to measurements. Most have found that direct damping is consistently overpredicted. The thrust of this research is to explain...

  13. Diamond machine tool face lapping machine

    DOE Patents [OSTI]

    Yetter, H.H.

    1985-05-06T23:59:59.000Z

    An apparatus for shaping, sharpening and polishing diamond-tipped single-point machine tools. The isolation of a rotating grinding wheel from its driving apparatus using an air bearing and causing the tool to be shaped, polished or sharpened to be moved across the surface of the grinding wheel so that it does not remain at one radius for more than a single rotation of the grinding wheel has been found to readily result in machine tools of a quality which can only be obtained by the most tedious and costly processing procedures, and previously unattainable by simple lapping techniques.

  14. Amorphous diamond films

    DOE Patents [OSTI]

    Falabella, S.

    1998-06-09T23:59:59.000Z

    Amorphous diamond films having a significant reduction in intrinsic stress are prepared by biasing a substrate to be coated and depositing carbon ions thereon under controlled temperature conditions. 1 fig.

  15. Diamond-graphite field emitters

    DOE Patents [OSTI]

    Valone, Steven M. (Santa Fe, NM)

    1997-01-01T23:59:59.000Z

    A field emission electron emitter comprising an electrode of diamond and a conductive carbon, e.g., graphite, is provided.

  16. Structure of the eastern Red Rocks and Wind Ridge thrust faults, Wyoming: how a thrust fault gains displacement along strike 

    E-Print Network [OSTI]

    Huntsman, Brent Stanley

    1983-01-01T23:59:59.000Z

    OF FIELD MAPPING Methods . Thrust Faults . The Wind Ridge Thrust Fault System The Red Rocks Thrust Fault System CLAY MODEL STUDIES Purpose and Description Model Results DISCUSSION OF RESULTS Kinematics of the Red Rocks Thrust Fault Termination... . Kinematics of the Southern Wind Ridge Thrust Fault . . . A Conceptual Model of the Red Rocks Thrust Fault Termination Implications of the Red Rocks Fault Termination . . . . . . Page V1 V11 1X X1 X11 7 9 17 18 18 21 24 27 35 35 38 49 49...

  17. Lower pressure synthesis of diamond material

    DOE Patents [OSTI]

    Lueking, Angela (State College, PA); Gutierrez, Humberto (State College, PA); Narayanan, Deepa (Redmond, WA); Burgess Clifford, Caroline E. (State College, PA); Jain, Puja (King Of Prussia, PA)

    2010-07-13T23:59:59.000Z

    Methods of synthesizing a diamond material, particularly nanocrystalline diamond, diamond-like carbon and bucky diamond are provided. In particular embodiments, a composition including a carbon source, such as coal, is subjected to addition of energy, such as high energy reactive milling, producing a milling product enriched in hydrogenated tetrahedral amorphous diamond-like carbon compared to the coal. A milling product is treated with heat, acid and/or base to produce nanocrystalline diamond and/or crystalline diamond-like carbon. Energy is added to produced crystalline diamond-like carbon in particular embodiments to produce bucky diamonds.

  18. CVD diamond - fundamental phenomena

    SciTech Connect (OSTI)

    Yarbrough, W.A. [Pennsylvania State Univ., University Park (United States)

    1993-01-01T23:59:59.000Z

    This compilation of figures and diagrams addresses the basic physical processes involved in the chemical vapor deposition of diamond. Different methods of deposition are illustrated. For each method, observations are made of the prominent advantages and disadvantages of the technique. Chemical mechanisms of nucleation are introduced.

  19. Passive magnetic bearing configurations

    DOE Patents [OSTI]

    Post, Richard F. (Walnut Creek, CA)

    2011-01-25T23:59:59.000Z

    A journal bearing provides vertical and radial stability to a rotor of a passive magnetic bearing system when the rotor is not rotating and when it is rotating. In the passive magnetic bearing system, the rotor has a vertical axis of rotation. Without the journal bearing, the rotor is vertically and radially unstable when stationary, and is vertically stable and radially unstable when rotating.

  20. Structure and properties of diamond and diamond-like films

    SciTech Connect (OSTI)

    Clausing, R.E. [Oak Ridge National Lab., TN (United States)

    1993-01-01T23:59:59.000Z

    This section is broken into four parts: (1) introduction, (2) natural IIa diamond, (3) importance of structure and composition, and (4) control of structure and properties. Conclusions of this discussion are that properties of chemical vapor deposited diamond films can compare favorably with natural diamond, that properties are anisotropic and are a strong function of structure and crystal perfection, that crystal perfection and morphology are functions of growth conditions and can be controlled, and that the manipulation of texture and thereby surface morphology and internal crystal perfection is an important step in optimizing chemically deposited diamond films for applications.

  1. Diamond films treated with alkali-halides

    DOE Patents [OSTI]

    Anderson, D.F.; Kwan, S.W.

    1997-04-08T23:59:59.000Z

    A secondary electron emitter is provided and includes a substrate with a diamond film, the diamond film is treated or coated with an alkali-halide. 5 figs.

  2. Diamond turning of glass

    SciTech Connect (OSTI)

    Blackley, W.S.; Scattergood, R.O.

    1988-12-01T23:59:59.000Z

    A new research initiative will be undertaken to investigate the critical cutting depth concepts for single point diamond turning of brittle, amorphous materials. Inorganic glasses and a brittle, thermoset polymer (organic glass) are the principal candidate materials. Interrupted cutting tests similar to those done in earlier research are Ge and Si crystals will be made to obtain critical depth values as a function of machining parameters. The results will provide systematic data with which to assess machining performance on glasses and amorphous materials

  3. Raman and conductivity studies of boron-doped microcrystalline diamond, facetted nanocrystalline diamond and cauliflower diamond films

    E-Print Network [OSTI]

    Bristol, University of

    -like conductivity. A complication is that polycrystalline boron-doped CVD diamond films possess grain boundariesRaman and conductivity studies of boron-doped microcrystalline diamond, facetted nanocrystalline diamond and cauliflower diamond films P.W. May a,, W.J. Ludlow a , M. Hannaway a , P.J. Heard b , J

  4. High efficiency diamond solar cells

    DOE Patents [OSTI]

    Gruen, Dieter M. (Downers Grove, IL)

    2008-05-06T23:59:59.000Z

    A photovoltaic device and method of making same. A layer of p-doped microcrystalline diamond is deposited on a layer of n-doped ultrananocrystalline diamond such as by providing a substrate in a chamber, providing a first atmosphere containing about 1% by volume CH.sub.4 and about 99% by volume H.sub.2 with dopant quantities of a boron compound, subjecting the atmosphere to microwave energy to deposit a p-doped microcrystalline diamond layer on the substrate, providing a second atmosphere of about 1% by volume CH.sub.4 and about 89% by volume Ar and about 10% by volume N.sub.2, subjecting the second atmosphere to microwave energy to deposit a n-doped ultrananocrystalline diamond layer on the p-doped microcrystalline diamond layer. Electrodes and leads are added to conduct electrical energy when the layers are irradiated.

  5. UV photoemission efficiency of polycrystalline CVD diamond films

    E-Print Network [OSTI]

    Tremsin, A S; Siegmund, OHW

    2005-01-01T23:59:59.000Z

    efficiency of a polycrystalline diamond planar reflectivequantum efficiency of polycrystalline diamond films grown onallowed the growth of polycrystalline diamond thin films on

  6. LANSCE | Lujan Center | Thrust Area | Local Structure, Magnetism...

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

    Thrust Area Local Structure, Magnetism, and Nanomaterials The Lujan Neutron Scattering Center encompasses a set of powder diffractometers, instrument scientist specialists, and...

  7. PDC (polycrystalline diamond compact) bit research at Sandia National Laboratories

    SciTech Connect (OSTI)

    Finger, J.T.; Glowka, D.A.

    1989-06-01T23:59:59.000Z

    From the beginning of the geothermal development program, Sandia has performed and supported research into polycrystalline diamond compact (PDC) bits. These bits are attractive because they are intrinsically efficient in their cutting action (shearing, rather than crushing) and they have no moving parts (eliminating the problems of high-temperature lubricants, bearings, and seals.) This report is a summary description of the analytical and experimental work done by Sandia and our contractors. It describes analysis and laboratory tests of individual cutters and complete bits, as well as full-scale field tests of prototype and commercial bits. The report includes a bibliography of documents giving more detailed information on these topics. 26 refs.

  8. Tailoring nanocrystalline diamond film properties

    DOE Patents [OSTI]

    Gruen, Dieter M. (Downers Grove, IL); McCauley, Thomas G. (Somerville, MA); Zhou, Dan (Orlando, FL); Krauss, Alan R. (Naperville, IL)

    2003-07-15T23:59:59.000Z

    A method for controlling the crystallite size and growth rate of plasma-deposited diamond films. A plasma is established at a pressure in excess of about 55 Torr with controlled concentrations of hydrogen up to about 98% by volume, of unsubstituted hydrocarbons up to about 3% by volume and an inert gas of one or more of the noble gases and nitrogen up to about 98% by volume. The volume ratio of inert gas to hydrogen is preferably maintained at greater than about 4, to deposit a diamond film on a suitable substrate. The diamond film is deposited with a predetermined crystallite size and at a predetermined growth rate.

  9. Amorphous-diamond electron emitter

    DOE Patents [OSTI]

    Falabella, Steven (Livermore, CA)

    2001-01-01T23:59:59.000Z

    An electron emitter comprising a textured silicon wafer overcoated with a thin (200 .ANG.) layer of nitrogen-doped, amorphous-diamond (a:D-N), which lowers the field below 20 volts/micrometer have been demonstrated using this emitter compared to uncoated or diamond coated emitters wherein the emission is at fields of nearly 60 volts/micrometer. The silicon/nitrogen-doped, amorphous-diamond (Si/a:D-N) emitter may be produced by overcoating a textured silicon wafer with amorphous-diamond (a:D) in a nitrogen atmosphere using a filtered cathodic-arc system. The enhanced performance of the Si/a:D-N emitter lowers the voltages required to the point where field-emission displays are practical. Thus, this emitter can be used, for example, in flat-panel emission displays (FEDs), and cold-cathode vacuum electronics.

  10. Electronics Engineering Department Thrust Area report FY'84

    SciTech Connect (OSTI)

    Minichino, C.; Phelps, P.L. (eds.)

    1984-01-01T23:59:59.000Z

    This report describes the work of the Electronics Engineering Department Thrust Areas for FY'84: diagnostics and microelectronic engineering; signal and control engineering; microwave and pulsed power engineering; computer-aided engineering; engineering modeling and simulation; and systems engineering. For each Thrust Area, an overview and a description of the goals and achievements of each project is provided.

  11. DIAMOND CHEMICAL VAPOR DEPOSITION Nucleation and Early Growth Stages

    E-Print Network [OSTI]

    Dandy, David

    a reality. Epi- taxial diamond has been grown on diamond and cubic-BN. Polycrystalline diamond films haveDIAMOND CHEMICAL VAPOR DEPOSITION Nucleation and Early Growth Stages by Huimin Liu David S. Dandy of high-quality diamond coatings on preshaped parts and synthesis of free-standing shapes of diamond

  12. Raman and conductivity studies of boron doped microcrystalline diamond, facetted nanocrystalline diamond

    E-Print Network [OSTI]

    Bristol, University of

    superconductivity at temperatures polycrystalline boron-doped CVD diamond filmsRaman and conductivity studies of boron doped microcrystalline diamond, facetted nanocrystalline diamond and cauliflower diamond films P.W. May a,*, W.J. Ludlow a , M. Hannaway a , P.J. Heard b , J

  13. Double bevel construction of a diamond anvil

    DOE Patents [OSTI]

    Moss, W.C.

    1987-02-06T23:59:59.000Z

    Use of double or multiple bevel culet geometry on a diamond anvil to provide increased sample pressure and stability for a given force applied to the diamond tables. 7 figs.

  14. Diamond Thin Films Handbook David S. Dandy

    E-Print Network [OSTI]

    Dandy, David

    ..................................................................................10 A. Calculation of diamond surface structures and energetics .................................................................................................36 2. Reactor pressure ...........................................................................................48 VI. Reactor scale modeling

  15. Method of Forming Diamonds from Carbonaceous Material

    SciTech Connect (OSTI)

    Daulton, Tyrone; Lewis, Roy; Rehn, Lynn; Kirk, Marquis

    1999-11-30T23:59:59.000Z

    A method for producing diamonds is provided comprising exposing carbonaceous material to ion irradiation at ambient temperature and pressure.

  16. Recent Results on Diamond Radiation Tolerance

    E-Print Network [OSTI]

    Seidel, Sally

    -crystal (sc) and polycrystalline (poly) diamond exposed to 5 beam conditions. Figure of merit: Mean Free PathRecent Results on Diamond Radiation Tolerance Sally Seidel University of New Mexico Representing 1 #12;§ Overview of diamond and radiation damage issues § Investigation of the application

  17. Fracture of synthetic diamond M. D. Droty

    E-Print Network [OSTI]

    Ritchie, Robert

    of synthetic polycrystalline diamond make it a promising material for many structural applications studies on the fracture toughness of polycrystalline diamond,29 primarily due to the difficultiesFracture of synthetic diamond M. D. Droty Ctystallume, 3506 Bassett Street, Santa Clara, California

  18. Implications of thermal events on thrust emplacement sequence in the Appalachian fold and thrust belt: Some new vitrinite reflectance data

    SciTech Connect (OSTI)

    Lewis, S.E.; Hower, J.C. (Montana Tech, Butte (USA))

    1990-11-01T23:59:59.000Z

    Interpretation of existing geothermometry data combined with new vitrinite reflectance data, within the framework of a detailed composite tectonic setting, elucidates the evolution of structural sequencing of thrust sheets during the Alleghanian event in the Valley and Ridge Province in Virginia. That the Pulaski thrust sheet preceded the Saltville thrust sheet in the emplacement sequence, and that both reached thermal maxima prior to, or during, respective emplacement may be inferred from vitrinite and other geothermometry data. In contrast, the Narrows and St. Clair thrust sheets probably each attained their thermal maximum after emplacement. New vitrinite reflectance data are consistent with CAI and other temperature-sensitive information heretofore ascertained in the Valley and Ridge Province and support previously established maximum temperatures of ca. 200C for strata of the Saltville thrust sheet as young as Mississippian. R{sub max} values from Mississippian coals in the Price Formation of the Saltville sheet, beneath but near the Pulaski thrust, range from 1.61% to 2.60%. At the structural front of the fold and thrust belt, a single Mississippian coal sample from the Bluefield Formation yields an R{sub max} value of 1.35%. Those coals showing highest R{sub max} values are more intensely fractured with secondary minerals filling the fractures. Warm fluids introduced during tectonic events may have played at least as important a role as that of combined stratigraphic and tectonic burial.

  19. Diamond and diamond-like films for transportation applications

    SciTech Connect (OSTI)

    Perez, J.M.

    1993-01-01T23:59:59.000Z

    This section is a compilation of transparency templates which describe the goals of the Office of Transportation Materials (OTM) Tribology Program. The positions of personnel on the OTM are listed. The role and mission of the OTM is reviewed. The purpose of the Tribology Program is stated to be `to obtain industry input on program(s) in tribology/advanced lubricants areas of interest`. The objective addressed here is to identify opportunities for cost effective application of diamond and diamond-like carbon in transportation systems.

  20. Diamond-silicon carbide composite

    DOE Patents [OSTI]

    Qian, Jiang; Zhao, Yusheng

    2006-06-13T23:59:59.000Z

    Fully dense, diamond-silicon carbide composites are prepared from ball-milled microcrystalline diamond/amorphous silicon powder mixture. The ball-milled powder is sintered (P=5–8 GPa, T=1400K–2300K) to form composites having high fracture toughness. A composite made at 5 GPa/1673K had a measured fracture toughness of 12 MPa.dot.m1/2. By contrast, liquid infiltration of silicon into diamond powder at 5 GPa/1673K produces a composite with higher hardness but lower fracture toughness. X-ray diffraction patterns and Raman spectra indicate that amorphous silicon is partially transformed into nanocrystalline silicon at 5 GPa/873K, and nanocrystalline silicon carbide forms at higher temperatures.

  1. Peak thrust operation of linear induction machines from parameter identification

    SciTech Connect (OSTI)

    Zhang, Z.; Eastham, T.R.; Dawson, G.E. [Queen`s Univ., Kingston, Ontario (Canada). Dept. of Electrical and Computer Engineering

    1995-12-31T23:59:59.000Z

    Various control strategies are being used to achieve high performance operation of linear drives. To maintain minimum volume and weight of the power supply unit on board the transportation vehicle, peak thrust per unit current operation is a desirable objective. True peak thrust per unit current through slip control is difficult to achieve because the parameters of linear induction machines vary during normal operation. This paper first develops a peak thrust per unit current control law based on the per-phase equivalent circuit for linear induction machines. The algorithm for identification of the variable parameters in induction machines is then presented. Application to an operational linear induction machine (LIM) demonstrates the utility of this algorithm. The control strategy is then simulated, based on an operational transit LIM, to show the capability of achieving true peak thrust operation for linear induction machines.

  2. Thrust Network Analysis : exploring three-dimensional equilibrium

    E-Print Network [OSTI]

    Block, Philippe (Philippe Camille Vincent)

    2009-01-01T23:59:59.000Z

    This dissertation presents Thrust Network Analysis, a new methodology for generating compression-only vaulted surfaces and networks. The method finds possible funicular solutions under gravitational loading within a defined ...

  3. Method for machining steel with diamond tools

    DOE Patents [OSTI]

    Casstevens, J.M.

    1984-01-01T23:59:59.000Z

    The present invention is directed to a method for machine optical quality finishes and contour accuracies of workpieces of carbon-containing metals such as steel with diamond tooling. The wear rate of the diamond tooling is significantly reduced by saturating the atmosphere at the interface of the workpiece and the diamond tool with a gaseous hydrocarbon during the machining operation. The presence of the gaseous hydrocarbon effectively eliminates the deterioration of the diamond tool by inhibiting or preventing the conversion of the diamond carbon to graphite carbon at the point of contact between the cutting tool and the workpiece.

  4. Method for machining steel with diamond tools

    DOE Patents [OSTI]

    Casstevens, John M. (Greenville, TX)

    1986-01-01T23:59:59.000Z

    The present invention is directed to a method for machining optical quality inishes and contour accuracies of workpieces of carbon-containing metals such as steel with diamond tooling. The wear rate of the diamond tooling is significantly reduced by saturating the atmosphere at the interface of the workpiece and the diamond tool with a gaseous hydrocarbon during the machining operation. The presence of the gaseous hydrocarbon effectively eliminates the deterioration of the diamond tool by inhibiting or preventing the conversion of the diamond carbon to graphite carbon at the point of contact between the cutting tool and the workpiece.

  5. Deformation of layered rocks in the ramp regions of thrust faults: a study with rock models

    E-Print Network [OSTI]

    Chester, Judith Savaso

    1985-01-01T23:59:59.000Z

    and thrust belts for example, thrust faults commonly occur along specific stratigraphic horizons, and folding and faulting within thrust sheets often involves slip along bedding planes (e. g. , Rich, 1934; Douglas, 1950; Dahl str om, 1970; Price, 1981...). With the regional framework of many fold and thrust belts well estab- lished, the current emphasis of many studies has turned to defining the geometries, kinematics, and deformation mechanisms of individual thrust belt structures, and the intrinsic and extrinsic...

  6. EA-1795: Diamond Green Diesel Facility in Norco, LA | Department...

    Office of Environmental Management (EM)

    5: Diamond Green Diesel Facility in Norco, LA EA-1795: Diamond Green Diesel Facility in Norco, LA April 1, 2011 EA-1795: Final Environmental Assessment Loan Guarantee to Diamond...

  7. Magnetic properties of aggregate polycrystalline diamond: implications for carbonado history

    E-Print Network [OSTI]

    Kletetschka, Gunther

    Magnetic properties of aggregate polycrystalline diamond: implications for carbonado history Gu form 20 June 2000; accepted 25 June 2000 Abstract Carbonados are aggregate polycrystalline diamonds features; magnetic hysteresis 1. Introduction Carbonados are sintered polycrystalline micro- diamond

  8. Chemical vapor deposited diamond-on-diamond powder composites (LDRD final report)

    SciTech Connect (OSTI)

    Panitz, J.K.; Hsu, W.L.; Tallant, D.R.; McMaster, M.; Fox, C.; Staley, D.

    1995-12-01T23:59:59.000Z

    Densifying non-mined diamond powder precursors with diamond produced by chemical vapor infiltration (CVI) is an attractive approach for forming thick diamond deposits that avoids many potential manufacturability problems associated with predominantly chemical vapor deposition (CVD) processes. The authors developed techniques for forming diamond powder precursors and densified these precursors in a hot filament-assisted reactor and a microwave plasma-assisted reactor. Densification conditions were varied following a fractional factorial statistical design. A number of conclusions can be drawn as a result of this study. High density diamond powder green bodies that contain a mixture of particle sizes solidify more readily than more porous diamond powder green bodies with narrow distributions of particle sizes. No composite was completely densified although all of the deposits were densified to some degree. The hot filament-assisted reactor deposited more material below the exterior surface, in the interior of the powder deposits; in contrast, the microwave-assisted reactor tended to deposit a CVD diamond skin over the top of the powder precursors which inhibited vapor phase diamond growth in the interior of the powder deposits. There were subtle variations in diamond quality as a function of the CVI process parameters. Diamond and glassy carbon tended to form at the exterior surface of the composites directly exposed to either the hot filament or the microwave plasma. However, in the interior, e.g. the powder/substrate interface, diamond plus diamond-like-carbon formed. All of the diamond composites produced were grey and relatively opaque because they contained flawed diamond, diamond-like-carbon and glassy carbon. A large amount of flawed and non-diamond material could be removed by post-CVI oxygen heat treatments. Heat treatments in oxygen changed the color of the composites to white.

  9. Epitaxial growth of europium monoxide on diamond

    SciTech Connect (OSTI)

    Melville, A.; Heeg, T. [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); Mairoser, T.; Schmehl, A. [Zentrum für elektronische Korrelationen und Magnetismus, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg (Germany)] [Zentrum für elektronische Korrelationen und Magnetismus, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg (Germany); Fischer, M.; Gsell, S.; Schreck, M. [Institut für Physik, Universität Augsburg, D-86135 Augsburg (Germany)] [Institut für Physik, Universität Augsburg, D-86135 Augsburg (Germany); Awschalom, D. D. [Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637 (United States)] [Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637 (United States); Holländer, B.; Schubert, J. [Peter Grünberg Institute, PGI9-IT, JARA-FIT, Research Centre Jülich, D-52425 Jülich (Germany)] [Peter Grünberg Institute, PGI9-IT, JARA-FIT, Research Centre Jülich, D-52425 Jülich (Germany); Schlom, D. 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)

    2013-11-25T23:59:59.000Z

    We report the epitaxial integration of phase-pure EuO on both single-crystal diamond and on epitaxial diamond films grown on silicon utilizing reactive molecular-beam epitaxy. The epitaxial orientation relationship is (001) EuO ? (001) diamond and [110] EuO ?[100] diamond. The EuO layer is nominally unstrained and ferromagnetic with a transition temperature of 68 ± 2 K and a saturation magnetization of 5.5 ± 0.1 Bohr magnetons per europium ion on the single-crystal diamond, and a transition temperature of 67 ± 2 K and a saturation magnetization of 2.1 ± 0.1 Bohr magnetons per europium ion on the epitaxial diamond film.

  10. Diamond-silicon carbide composite and method

    DOE Patents [OSTI]

    Zhao, Yusheng (Los Alamos, NM)

    2011-06-14T23:59:59.000Z

    Uniformly dense, diamond-silicon carbide composites having high hardness, high fracture toughness, and high thermal stability are prepared by consolidating a powder mixture of diamond and amorphous silicon. A composite made at 5 GPa/1673K had a measured fracture toughness of 12 MPam.sup.1/2. By contrast, liquid infiltration of silicon into diamond powder at 5 GPa/1673K produces a composite with higher hardness but lower fracture toughness.

  11. Separability of drag and thrust in undulatory animals and machines

    E-Print Network [OSTI]

    Bale, Rahul; Neveln, Izaak D; Bhalla, Amneet Pal Singh; MacIver, Malcolm A; Patankar, Neelesh A

    2014-01-01T23:59:59.000Z

    For nearly a century, researchers have tried to understand the swimming of aquatic animals in terms of a balance between the forward thrust from swimming movements and drag on the body. Prior approaches have failed to provide a separation of these two forces for undulatory swimmers such as lamprey and eels, where most parts of the body are simultaneously generating drag and thrust. We nonetheless show that this separation is possible, and delineate its fundamental basis in undulatory swimmers. Our approach unifies a vast diversity of undulatory aquatic animals (anguilliform, sub-carangiform, gymnotiform, bal- istiform, rajiform) and provides design principles for highly agile bioinspired underwater vehicles. This approach has practical utility within biology as well as engineering. It is a predictive tool for use in understanding the role of the mechanics of movement in the evolutionary emergence of morphological features relating to locomotion. For example, we demonstrate that the drag-thrust separation fram...

  12. All diamond self-aligned thin film transistor

    DOE Patents [OSTI]

    Gerbi, Jennifer (Champaign, IL)

    2008-07-01T23:59:59.000Z

    A substantially all diamond transistor with an electrically insulating substrate, an electrically conductive diamond layer on the substrate, and a source and a drain contact on the electrically conductive diamond layer. An electrically insulating diamond layer is in contact with the electrically conductive diamond layer, and a gate contact is on the electrically insulating diamond layer. The diamond layers may be homoepitaxial, polycrystalline, nanocrystalline or ultrananocrystalline in various combinations.A method of making a substantially all diamond self-aligned gate transistor is disclosed in which seeding and patterning can be avoided or minimized, if desired.

  13. Diamond turning machine controller implementation

    SciTech Connect (OSTI)

    Garrard, K.P.; Taylor, L.W.; Knight, B.F.; Fornaro, R.J.

    1988-12-01T23:59:59.000Z

    The standard controller for a Pnuemo ASG 2500 Diamond Turning Machine, an Allen Bradley 8200, has been replaced with a custom high-performance design. This controller consists of four major components. Axis position feedback information is provided by a Zygo Axiom 2/20 laser interferometer with 0.1 micro-inch resolution. Hardware interface logic couples the computers digital and analog I/O channels to the diamond turning machine`s analog motor controllers, the laser interferometer, and other machine status and control information. It also provides front panel switches for operator override of the computer controller and implement the emergency stop sequence. The remaining two components, the control computer hardware and software, are discussed in detail below.

  14. Electromagnetic Radiation Hardness of Diamond Detectors

    E-Print Network [OSTI]

    T. Behnke; M. Doucet; N. Ghodbane; A. Imhof; C. Martinez; W. Zeuner

    2001-08-22T23:59:59.000Z

    The behavior of artificially grown CVD diamond films under intense electromagnetic radiation has been studied. The properties of irradiated diamond samples have been investigated using the method of thermally stimulated current and by studying their charge collection properties. Diamonds have been found to remain unaffected after doses of 6.8 MGy of 10 keV photons and 10 MGy of MeV-range photons. This observation makes diamond an attractive detector material for a calorimeter in the very forward region of the proposed TESLA detector.

  15. Diamond turning of thermoplastic polymers

    SciTech Connect (OSTI)

    Smith, E.; Scattergood, R.O.

    1988-12-01T23:59:59.000Z

    Single point diamond turning studies were made using a series of thermoplastic polymers with different glass transition temperatures. Variations in surface morphology and surface roughness were observed as a function of cutting speed. Lower glass transition temperatures facilitate smoother surface cuts and better surface finish. This can be attributed to the frictional heating that occurs during machining. Because of the very low glass transition temperatures in polymeric compared to inorganic glasses, the precision machining response can be very speed sensitive.

  16. Problems of millipound thrust measurement. The "Hansen Suspension"

    SciTech Connect (OSTI)

    Carta, David G.

    2014-03-31T23:59:59.000Z

    Considered in detail are problems which led to the need and use of the 'Hansen Suspension'. Also discussed are problems which are likely to be encountered in any low level thrust measuring system. The methods of calibration and the accuracies involved are given careful attention. With all parameters optimized and calibration techniques perfected, the system was found capable of a resolution of 10 {mu} lbs. A comparison of thrust measurements made by the 'Hansen Suspension' with measurements of a less sophisticated device leads to some surprising results.

  17. Properties of chemical vapor infiltration diamond deposited in a diamond powder matrix

    SciTech Connect (OSTI)

    Panitz, J.K.G.; Tallant, D.R.; Hills, C.R.; Staley, D.J.

    1993-12-31T23:59:59.000Z

    Densifying non-mined diamond powder precursors with diamond produced by chemical vapor infiltration (CVI) is an attractive approach for forming thick diamond deposits that avoids many potential manufacturability problems associated with predominantly chemical vapor deposition (CVD) processes. The authors have developed two techniques: electrophoretic deposition and screen printing, to form nonmined diamond powder precursors on substrates. They then densify these precursors in a hot filament assisted reactor. Analysis indicated that a hot filament assisted chemical vapor infiltration process forms intergranular diamond deposits with properties that are to some degree different from predominantly hot-filament-assisted CVD material.

  18. Passive magnetic bearing system

    DOE Patents [OSTI]

    Post, Richard F.

    2014-09-02T23:59:59.000Z

    An axial stabilizer for the rotor of a magnetic bearing provides external control of stiffness through switching in external inductances. External control also allows the stabilizer to become a part of a passive/active magnetic bearing system that requires no external source of power and no position sensor. Stabilizers for displacements transverse to the axis of rotation are provided that require only a single cylindrical Halbach array in its operation, and thus are especially suited for use in high rotation speed applications, such as flywheel energy storage systems. The elimination of the need of an inner cylindrical array solves the difficult mechanical problem of supplying support against centrifugal forces for the magnets of that array. Compensation is provided for the temperature variation of the strength of the magnetic fields of the permanent magnets in the levitating magnet arrays.

  19. Centrifugally decoupling touchdown bearings

    DOE Patents [OSTI]

    Post, Richard F

    2014-06-24T23:59:59.000Z

    Centrifugally decoupling mechanical bearing systems provide thin tensioned metallic ribbons contained in a support structure. This assembly rotates around a stationary shaft being centered at low speeds by the action of the metal ribbons. Tension springs are connected on one end to the ribbons and on the other end to the support structure. The ribbons pass through slots in the inner ring of the support structure. The spring preloading thus insures contact (or near-contact) between the ribbons and the shaft at rotation speeds below the transition speed. Above this speed, however, the centrifugal force on the ribbons produces a tensile force on them that exceeds the spring tensile force so that the ribbons curve outward, effectively decoupling them from mechanical contact with the shaft. They still remain, however, in position to act as a touchdown bearing in case of abnormally high transverse accelerations.

  20. Radium bearing waste disposal

    SciTech Connect (OSTI)

    Tope, W.G.; Nixon, D.A.; Smith, M.L.; Stone, T.J.; Vogel, R.A. [Fernald Environmental Restoration Management Corp., Cincinnati, OH (United States); Schofield, W.D. [Foster Wheeler Environmental Corp. (United States)

    1995-07-01T23:59:59.000Z

    Fernald radium bearing ore residue waste, stored within Silos 1 and 2 (K-65) and Silo 3, will be vitrified for disposal at the Nevada Test Site (NTS). A comprehensive, parametric evaluation of waste form, packaging, and transportation alternatives was completed to identify the most cost-effective approach. The impacts of waste loading, waste form, regulatory requirements, NTS waste acceptance criteria, as-low-as-reasonably-achievable principles, and material handling costs were factored into the recommended approach.

  1. ORIGINAL PAPER Granite magma migration and emplacement along thrusts

    E-Print Network [OSTI]

    Galland, Olivier

    ORIGINAL PAPER Granite magma migration and emplacement along thrusts Eric C. Ferre´ · Olivier in the emplacement of granite plutons in contractional settings. We address both cases where contractional tectonics. This phenomenon occurs for both low-viscosity magma (basalts to andesite) and high-viscosity magma (dry granite

  2. Engineering Research, Development and Technology, FY95: Thrust area report

    SciTech Connect (OSTI)

    NONE

    1996-02-01T23:59:59.000Z

    The mission of the Engineering Research, Development, and Technology Program at Lawrence Livermore National Laboratory (LLNL) is to develop the knowledge base, process technologies, specialized equipment, tools and facilities to support current and future LLNL programs. Engineering`s efforts are guided by a strategy that results in dual benefit: first, in support of Department of Energy missions, such as national security through nuclear deterrence; and second, in enhancing the nation`s economic competitiveness through their collaboration with US industry in pursuit of the most cost-effective engineering solutions to LLNL programs. To accomplish this mission, the Engineering Research, Development, and Technology Program has two important goals: (1) identify key technologies relevant to LLNL programs where they can establish unique competencies, and (2) conduct high-quality research and development to enhance their capabilities and establish themselves as the world leaders in these technologies. To focus Engineering`s efforts, technology thrust areas are identified and technical leaders are selected for each area. The thrust areas are comprised of integrated engineering activities, staffed by personnel from the nine electronics and mechanical engineering divisions, and from other LLNL organizations. This annual report, organized by thrust area, describes Engineering`s activities for fiscal year 1995. The report provides timely summaries of objectives methods, and key results from eight thrust areas: computational electronics and electromagnetics; computational mechanics; microtechnology; manufacturing technology; materials science and engineering; power conversion technologies; nondestructive evaluation; and information engineering.

  3. Comparisons of Scintillating Fiber, Diamond Particle Detector

    E-Print Network [OSTI]

    McDonald, Kirk

    /W detector response map x-ray injection diamond detector response drooping ? To be examined on other (more intense) x-ray beamlines the drooping effect of diamond detector, if any x-ray injected on the back response is fairly uniform No drooping ? #12;

  4. Double bevel construction of a diamond anvil

    DOE Patents [OSTI]

    Moss, W.C.

    1988-10-11T23:59:59.000Z

    A double or multiple bevel culet geometry is used on a diamond anvil in a high pressure cell apparatus to provide increased sample pressure and stability for a given force applied to the diamond tables. Double or multiple bevel culet geometries can also be used for sapphire or other hard crystal anvils. Pressures up to and above 5 Megabars can be reached. 8 figs.

  5. Fluorinated diamond bonded in fluorocarbon resin

    DOE Patents [OSTI]

    Taylor, Gene W. (Los Alamos, NM)

    1982-01-01T23:59:59.000Z

    By fluorinating diamond grit, the grit may be readily bonded into a fluorocarbon resin matrix. The matrix is formed by simple hot pressing techniques. Diamond grinding wheels may advantageously be manufactured using such a matrix. Teflon fluorocarbon resins are particularly well suited for using in forming the matrix.

  6. Energy Harvesting Diamond Channel with Energy Cooperation

    E-Print Network [OSTI]

    Ulukus, Sennur

    Energy Harvesting Diamond Channel with Energy Cooperation Berk Gurakan Sennur Ulukus Department@umd.edu Abstract--We consider the energy harvesting diamond channel, where the source and two relays harvest energy the option of wirelessly transferring some of its energy to the relays via energy cooperation. We find

  7. Optoelectronic applications of CVD diamond films

    SciTech Connect (OSTI)

    Beetz, C.P. Jr. (Semiconductor Products Dept., Advanced Technology Materials (US))

    1990-01-01T23:59:59.000Z

    Diamond films synthesized by chemical vapor deposition from hydrocarbon/hydrogen gas mixtures are being investigated for a wide number of industrial applications. This paper reports that the great interest in this new technology has created a number of small high tech entrepreneurial companies whose research programs are focused on developing electronic and optoelectronic applications of diamond.

  8. Integrated diamond networks for quantum nanophotonics

    E-Print Network [OSTI]

    Birgit J. M. Hausmann; Brendan Shields; Qimin Quan; Patrick Maletinsky; Murray McCutcheon; Jennifer T. Choy; Tom M. Babinec; Alexander Kubanek; Amir Yacoby; Mikhail D. Lukin; Marko Loncar

    2012-01-05T23:59:59.000Z

    Diamond is a unique material with exceptional physical and chemical properties that offers potential for the realization of high-performance devices with novel functionalities. For example diamond's high refractive index, transparency over wide wavelength range, and large Raman gain are of interest for the implementation of novel photonic devices. Recently, atom-like impurities in diamond emerged as an exceptional system for quantum information processing, quantum sensing and quantum networks. For these and other applications, it is essential to develop an integrated nanophotonic platform based on diamond. Here, we report on the realization of such an integrated diamond photonic platform, diamond on insulator (DOI), consisting of a thin single crystal diamond film on top of an insulating silicon dioxide/silicon substrate. Using this approach, we demonstrate diamond ring resonators that operate in a wide wavelength range, including the visible (630nm) and near-infrared (1,550nm). Finally, we demonstrate an integrated, on-chip quantum nanophotonic network, consisting of ring resonators coupled to low loss waveguides with grating couplers, that enables the generation and efficient routing of single photons at room temperature.

  9. Conceptual design of a thrust-vectoring tailcone for underwater robotics

    E-Print Network [OSTI]

    Nawrot, Michael T

    2012-01-01T23:59:59.000Z

    Thrust-vectoring on Autonomous Underwater Vehicles is an appealing directional-control solution because it improves turning radius capabilities. Unfortunately, thrust-vectoring requires the entire propulsion system be ...

  10. Thermal and Structural Constraints on the Tectonic Evolution of the Idaho-Wyoming-Utah Thrust Belt

    E-Print Network [OSTI]

    Chapman, Shay Michael

    2013-08-09T23:59:59.000Z

    The timing of motion on thrust faults in the Idaho-Wyoming-Utah (IWU) thrust belt comes from synorogenic sediments, apatite thermochronology and direct dating of fault rocks coupled with good geometrical constraints of the subsurface structure...

  11. Design and characterization of a nano-Newton resolution thrust stand J. Soni and S. Roy

    E-Print Network [OSTI]

    Roy, Subrata

    Design and characterization of a nano-Newton resolution thrust stand J. Soni and S. Roy Citation-Newton resolution thrust stand J. Soni and S. Roya) Applied Physics Research Group, University of Florida

  12. Thrust Area Report, Engineering Research, Development and Technology

    SciTech Connect (OSTI)

    Langland, R. T.

    1997-02-01T23:59:59.000Z

    The mission of the Engineering Research, Development, and Technology Program at Lawrence Livermore National Laboratory (LLNL) is to develop the knowledge base, process technologies, specialized equipment, tools and facilities to support current and future LLNL programs. Engineering`s efforts are guided by a strategy that results in dual benefit: first, in support of Department of Energy missions, such as national security through nuclear deterrence; and second, in enhancing the nation`s economic competitiveness through our collaboration with U.S. industry in pursuit of the most cost- effective engineering solutions to LLNL programs. To accomplish this mission, the Engineering Research, Development, and Technology Program has two important goals: (1) identify key technologies relevant to LLNL programs where we can establish unique competencies, and (2) conduct high-quality research and development to enhance our capabilities and establish ourselves as the world leaders in these technologies. To focus Engineering`s efforts technology {ital thrust areas} are identified and technical leaders are selected for each area. The thrust areas are comprised of integrated engineering activities, staffed by personnel from the nine electronics and mechanical engineering divisions, and from other LLNL organizations. This annual report, organized by thrust area, describes Engineering`s activities for fiscal year 1996. The report provides timely summaries of objectives, methods, and key results from eight thrust areas: Computational Electronics and Electromagnetics; Computational Mechanics; Microtechnology; Manufacturing Technology; Materials Science and Engineering; Power Conversion Technologies; Nondestructive Evaluation; and Information Engineering. Readers desiring more information are encouraged to contact the individual thrust area leaders or authors. 198 refs., 206 figs., 16 tabs.

  13. Characterization of the Muddy Mountain-Keystone thrust contact and related deformation

    E-Print Network [OSTI]

    Brock, William Gene

    1973-01-01T23:59:59.000Z

    and Red Rock Canyon the thrust has moved over an erosional surface on the Aztec Sandstone in which forethrust debris (composed of clasts from the upper and lower plates deposited in front of the advancing thrust as outwash and channel deposits) fills... topographic lowe. Thrust-related deformation in the lower plate (Aztec Sandstone or forethrust debris) is evaluated by macroscopic and microscopic analyses and the fol- lowing trends are noticed as the thrust contact is approached: (1) an increase...

  14. Toroidal plasma enhanced CVD of diamond films

    SciTech Connect (OSTI)

    Zvanya, John, E-mail: zvanya03@students.rowan.edu; Cullen, Christopher, E-mail: cullen38@students.rowan.edu; Morris, Thomas, E-mail: morris1j@students.rowan.edu; Krchnavek, Robert R., E-mail: krchnavek@rowan.edu [Department of Electrical and Computer Engineering, Rowan University, Glassboro, New Jersey 08028 (United States); Holber, William, E-mail: b.holber@plasmability.com; Basnett, Andrew, E-mail: abasnett54@yahoo.com; Basnett, Robert, E-mail: b.basnett@plasmability.com [Plasmability LLC, Austin, Texas 78732 (United States); Hettinger, Jeffrey, E-mail: hettinger@rowan.edu [Department of Physics and Astronomy, Rowan University, Glassboro, New Jersey 08028 (United States)

    2014-09-01T23:59:59.000Z

    An inductively coupled toroidal plasma source is used as an alternative to microwave plasmas for chemical vapor deposition of diamond films. The source, operating at a frequency of 400 kHz, synthesizes diamond films from a mixture of argon, methane, and hydrogen. The toroidal design has been adapted to create a highly efficient environment for diamond film deposition: high gas temperature and a short distance from the sample to the plasma core. Using a toroidal plasma geometry operating in the medium frequency band allows for efficient (?90%) coupling of AC line power to the plasma and a scalable path to high-power and large-area operation. In test runs, the source generates a high flux of atomic hydrogen over a large area, which is favorable for diamond film growth. Using a deposition temperature of 900–1050?°C and a source to sample distance of 0.1–2.0?cm, diamond films are deposited onto silicon substrates. The results showed that the deposition rate of the diamond films could be controlled using the sample temperature and source to sample spacing. The results also show the films exhibit good-quality polycrystalline diamond as verified by Raman spectroscopy, x-ray diffraction, and scanning electron microscopy. The scanning electron microscopy and x-ray diffraction results show that the samples exhibit diamond (111) and diamond (022) crystallites. The Raman results show that the sp{sup 3} peak has a narrow spectral width (FWHM 12?±?0.5?cm{sup ?1}) and that negligible amounts of the sp{sup 2} band are present, indicating good-quality diamond films.

  15. Multi-length Scale Modeling of CVD of Diamond Films

    E-Print Network [OSTI]

    Grujicic, Mica

    ) of single-- crystalline and polycrystalline diamond films in acrystalline and polycrystalline diamond filmsMulti-length Scale Modeling of CVD of Diamond Films M. Grujicic and S. G. LaiM. Grujicic and S. G-scale Modeling of CVD Deposition of Diamond Films RotatingRotating--disk Hotdisk Hot--filament CVD

  16. Appendix A SIMS profiles of hydrogen and deuterium in diamond

    E-Print Network [OSTI]

    Goddard III, William A.

    .5 due to the polycrystalline diamond coating on the quartz sample holder. The resulting layered127 Appendix A SIMS profiles of hydrogen and deuterium in diamond A.1 Introduction A diamond sample ion­beam doping. Impurity levels were profiled as a function of depth from the diamond surface using

  17. Nanofocusing optics for synchrotron radiation made from polycrystalline diamond

    E-Print Network [OSTI]

    Bristol, University of

    Nanofocusing optics for synchrotron radiation made from polycrystalline diamond O. J. L. Fox,1,2,* L. Alianelli,1 A. M. Malik,3,4 I. Pape,1,5 P. W. May,2 and K. J. S. Sawhney1 1 Diamond Light Source of Engineering, University of Nottingham, NG7 2RD, UK * oliver.fox@diamond.ac.uk Abstract: Diamond possesses many

  18. Carbon Bearing Trace Gases

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

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

  19. Chemical Analysis of Impurity Boron Atoms in Diamond Using Soft X-ray Emission Spectroscopy

    E-Print Network [OSTI]

    Muramatsu, Yasuji

    2009-01-01T23:59:59.000Z

    from the spectral profiles of HTP-B-diamond, h-BN, and c-BN.diamond differ from those of HTP-B-diamond and the reference

  20. Carbon sp2-on-sp3 Technology: Graphene-on-Diamond Devices and Interconnects

    E-Print Network [OSTI]

    Yu, Jie

    2012-01-01T23:59:59.000Z

    Table 2.2 lists the properties of polycrystalline diamond.Table 2.2 Polycrystalline diamond properties* Film Type MCD24 2.2 Polycrystalline diamond

  1. EVALUATION OF A LOW FRICTION - HIGH EFFICIENCY ROLLER BEARING ENGINE

    SciTech Connect (OSTI)

    Kolarik, Robert V. II; Shattuck, Charles W.; Copper, Anthony P.

    2009-06-30T23:59:59.000Z

    This Low Friction (High Efficiency Roller Bearing) Engine (LFE) report presents the work done by The Timken Company to conduct a technology demonstration of the benefits of replacing hydrodynamic bearings with roller bearings in the crankshaft and camshaft assemblies of an internal combustion engine for the purpose of collecting data sufficient to prove merit. The engines in the present study have been more extensively converted to roller bearings than any previous studies (40 needle roller bearings per engine) to gain understanding of the full potential of application of bearing technology. The project plan called for comparative testing of a production vehicle which was already respected for having demonstrated low engine friction levels with a rollerized version of that engine. Testing was to include industry standard tests for friction, emissions and fuel efficiency conducted on instrumented dynamometers. Additional tests for fuel efficiency, cold start resistance and other measures of performance were to be made in the actual vehicle. Comparative measurements of noise, vibration and harshness (NVH), were planned, although any work to mitigate the suspected higher NVH level in the rollerized engine was beyond the scope of this project. Timken selected the Toyota Avalon with a 3.5L V-6 engine as the test vehicle. In an attempt to minimize cost and fabrication time, a ‘made-from’ approach was proposed in which as many parts as possible would be used or modified from production parts to create the rollerized engine. Timken commissioned its test partner, FEV Engine Technology, to do a feasibility study in which they confirmed that using such an approach was possible to meet the required dimensional restrictions and tolerances. In designing the roller bearing systems for the crank and cam trains, Timken utilized as many production engine parts as possible. The crankshafts were produced from production line forgings, which use Timken steel, modified with special machining and heat treatment. Timken designed and manufactured all of the roller bearing related components such as the thrust bearing package. The production connecting rods and camshafts could not be used for the roller bearing engine, so new ones were produced according to the team’s designs using Timken steel. The remaining miscellaneous components were designed and procured by FEV. Timken prepared a display version of the crankshaft portion of the production engine without connecting rods which could be driven by a motor through a cogged-belt and electrically actuated clutch arrangement. A modified version was also made in which the engine was outfitted with roller bearings on the main bearing positions. Preliminary tests showed that the rollerized engine was running with 1/3 less friction than the standard display engine. Additional friction testing and noise characterization was cut short because of shipping damage to the rollerized engine display and because of other project priorities. The team did successfully demonstrate the ability to package roller bearings satisfactorily in numerous locations in a typical automotive engine. The scope of this project did not include durability demonstration and that subject would have to be addressed in any follow-on work. In the actual test phase, the rollerized engine did show significantly less friction in motored dynamometer tests compared to its production equivalent. The 5-10% improvement measured in this study was about half that seen in other studies. However, the fired test results did not show a reduction in friction which did not match prior experience or expectations. Subsequent teardown and inspection of the rollerized engine revealed potential sources of excessive friction in the experimental application. These features would be eliminated in a design not based on modification of production parts. The team is confident (based on experience) that friction reduction would be realized with proper modifications.

  2. JOURNAL OF MATERIALS SCIENCE 31 (1996) 2801 2805 Laser ablation of diamond fibres and a diamond fibre

    E-Print Network [OSTI]

    Bristol, University of

    .been embedded in Ti-6A1-4V alloy to produce a diamond fibre-reinforced composite. Both the fibres and a diamond fibre-reinforced titanium alloy composite. 2. Experimental procedure Fibres have been made of a diamond-coated fibre after localized ablations is shown tn Fig. 1. The areas of the diamond surface

  3. Self-composite comprised of nanocrystalline diamond and a non-diamond component useful for thermoelectric applications

    DOE Patents [OSTI]

    Gruen, Dieter M. (Downers Grove, IL)

    2009-08-11T23:59:59.000Z

    One provides nanocrystalline diamond material that comprises a plurality of substantially ordered diamond crystallites that are sized no larger than about 10 nanometers. One then disposes a non-diamond component within the nanocrystalline diamond material. By one approach this non-diamond component comprises an electrical conductor that is formed at the grain boundaries that separate the diamond crystallites from one another. The resultant nanowire is then able to exhibit a desired increase with respect to its ability to conduct electricity while also preserving the thermal conductivity behavior of the nanocrystalline diamond material.

  4. Self-composite comprised of nanocrystalline diamond and a non-diamond component useful for thermoelectric applications

    DOE Patents [OSTI]

    Gruen, Dieter M.

    2012-09-04T23:59:59.000Z

    One provides nanocrystalline diamond material that comprises a plurality of substantially ordered diamond crystallites that are sized no larger than about 10 nanometers. One then disposes a non-diamond component within the nanocrystalline diamond material. By one approach this non-diamond component comprises an electrical conductor that is formed at the grain boundaries that separate the diamond crystallites from one another. The resultant nanowire is then able to exhibit a desired increase with respect to its ability to conduct electricity while also preserving the thermal conductivity behavior of the nanocrystalline diamond material.

  5. Engineering research, development and technology. Thrust area report, FY93

    SciTech Connect (OSTI)

    Not Available

    1994-05-01T23:59:59.000Z

    The mission of the Engineering Research, Development, and Technology Program at Lawrence Livermore National Laboratory (LLNL) is to develop the technical staff, tools, and facilities needed to support current and future LLNL programs. The efforts are guided by a dual-benefit research and development strategy that supports Department of Energy missions, such as national security through nuclear deterrence and economic competitiveness through partnerships with U.S. industry. This annual report, organized by thrust area, describes the activities for the fiscal year 1993. The report provides timely summaries of objectives, methods, and results from nine thrust areas for this fiscal year: Computational Electronics and Electromagnetics; Computational Mechanics; Diagnostics and Microelectronics; Fabrication Technology; Materials Science and Engineering; Power Conversion Technologies; Nondestructive Evaluation; Remote Sensing, Imaging, and Signal Engineering; and Emerging Technologies. Separate abstracts were prepared for 47 papers in this report.

  6. First principles study of Fe in diamond: A diamond-based half metallic dilute magnetic semiconductor

    SciTech Connect (OSTI)

    Benecha, E. M. [Department of Physics, University of South Africa, P.O. Box 392, UNISA 0003 Pretoria (South Africa); Lombardi, E. B., E-mail: lombaeb@unisa.ac.za [College of Graduate Studies, University of South Africa, P.O. Box 392, UNISA 0003 Pretoria (South Africa)

    2013-12-14T23:59:59.000Z

    Half-metallic ferromagnetic ordering in semiconductors, essential in the emerging field of spintronics for injection and transport of highly spin polarised currents, has up to now been considered mainly in III–V and II–VI materials. However, low Curie temperatures have limited implementation in room temperature device applications. We report ab initio Density Functional Theory calculations on the properties of Fe in diamond, considering the effects of lattice site, charge state, and Fermi level position. We show that the lattice sites and induced magnetic moments of Fe in diamond depend strongly on the Fermi level position and type of diamond co-doping, with Fe being energetically most favorable at the substitutional site in p-type and intrinsic diamond, while it is most stable at a divacancy site in n-type diamond. Fe induces spin polarized bands in the band gap, with strong hybridization between Fe-3d and C-2s,2p bands. We further consider Fe-Fe spin interactions in diamond and show that substitutional Fe{sup +1} in p-type diamond exhibits a half-metallic character, with a magnetic moment of 1.0??{sub B} per Fe atom and a large ferromagnetic stabilization energy of 33?meV, an order of magnitude larger than in other semiconductors, with correspondingly high Curie temperatures. These results, combined with diamond's unique properties, demonstrate that Fe doped p-type diamond is likely to be a highly suitable candidate material for spintronics applications.

  7. Amorphous Diamond MEMS and Sensors

    SciTech Connect (OSTI)

    SULLIVAN, JOHN P.; FRIEDMANN, THOMAS A.; ASHBY, CAROL I.; DE BOER, MAARTEN P.; SCHUBERT, W. KENT; SHUL, RANDY J.; HOHLFELDER, ROBERT J.; LAVAN, D.A.

    2002-06-01T23:59:59.000Z

    This report describes a new microsystems technology for the creation of microsensors and microelectromechanical systems (MEMS) using stress-free amorphous diamond (aD) films. Stress-free aD is a new material that has mechanical properties close to that of crystalline diamond, and the material is particularly promising for the development of high sensitivity microsensors and rugged and reliable MEMS. Some of the unique properties of aD include the ability to easily tailor film stress from compressive to slightly tensile, hardness and stiffness 80-90% that of crystalline diamond, very high wear resistance, a hydrophobic surface, extreme chemical inertness, chemical compatibility with silicon, controllable electrical conductivity from insulating to conducting, and biocompatibility. A variety of MEMS structures were fabricated from this material and evaluated. These structures included electrostatically-actuated comb drives, micro-tensile test structures, singly- and doubly-clamped beams, and friction and wear test structures. It was found that surface micromachined MEMS could be fabricated in this material easily and that the hydrophobic surface of the film enabled the release of structures without the need for special drying procedures or the use of applied hydrophobic coatings. Measurements using these structures revealed that aD has a Young's modulus of {approx}650 GPa, a tensile fracture strength of 8 GPa, and a fracture toughness of 8 MPa{center_dot}m {sup 1/2}. These results suggest that this material may be suitable in applications where stiction or wear is an issue. Flexural plate wave (FPW) microsensors were also fabricated from aD. These devices use membranes of aD as thin as {approx}100 nm. The performance of the aD FPW sensors was evaluated for the detection of volatile organic compounds using ethyl cellulose as the sensor coating. For comparable membrane thicknesses, the aD sensors showed better performance than silicon nitride based sensors. Greater than one order of magnitude increase in chemical sensitivity is expected through the use of ultra-thin aD membranes in the FPW sensor. The discoveries and development of the aD microsystems technology that were made in this project have led to new research projects in the areas of aD bioMEMS and aD radio frequency MEMS.

  8. Geometry and temperature dependent thermal conductivity of diamond nanowires: A non-equilibrium molecular dynamics study

    E-Print Network [OSTI]

    Melnik, Roderick

    plasma etching of polycrystalline diamond films [7], microwave plasma assisted chemical vapor deposition. For theoretical calculations of proper- ties of nanosized diamond materials, polycrystalline diamond thin filmsGeometry and temperature dependent thermal conductivity of diamond nanowires: A non

  9. Effective placement of detectors at diamond interchanges

    E-Print Network [OSTI]

    Prabhakar, Dayakar

    1994-01-01T23:59:59.000Z

    Most signalized interchanges in Texas are tight urban diamond interchanges of freeways having one-way frontage roads. At these interchanges, traffic actuated control with improper location of detectors may result in inefficient traffic operations...

  10. Bear Head LNG Corporation and Bear Head LNG (USA), LLC - FE Dkt...

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

    Bear Head LNG Corporation and Bear Head LNG (USA), LLC - FE Dkt. No. - 15-33-LNG Bear Head LNG Corporation and Bear Head LNG (USA), LLC - FE Dkt. No. - 15-33-LNG The Office of...

  11. rf power system for thrust measurements of a helicon plasma source Alexander W. Kieckhafer and Mitchell L. R. Walker

    E-Print Network [OSTI]

    Walker, Mitchell

    rf power system for thrust measurements of a helicon plasma source Alexander W. Kieckhafer measurement stand and showed that rf power has no statistically significant contribution to the thrust stand now, a true thrust diagnostic that can measure thrust of a rf device does not exist. A helicon plasma

  12. Ultrasensitive Magnetometry and Imaging with NV Diamond

    E-Print Network [OSTI]

    Kim, Changdong

    2011-08-08T23:59:59.000Z

    ULTRASENSITIVE MAGNETOMETRY AND IMAGING WITH NV DIAMOND A Dissertation by CHANGDONG KIM Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree... of DOCTOR OF PHILOSOPHY May 2010 Major Subject: Electrical Engineering ULTRASENSITIVE MAGNETOMETRY AND IMAGING WITH NV DIAMOND A Dissertation by CHANGDONG KIM Submitted to the Office of Graduate Studies of Texas A...

  13. Diamond film growth from fullerene precursors

    DOE Patents [OSTI]

    Gruen, D.M.; Liu, S.; Krauss, A.R.; Pan, X.

    1997-04-15T23:59:59.000Z

    A method and system are disclosed for manufacturing diamond film. The method involves forming a fullerene vapor, providing a noble gas stream and combining the gas with the fullerene vapor, passing the combined fullerene vapor and noble gas carrier stream into a chamber, forming a plasma in the chamber causing fragmentation of the fullerene and deposition of a diamond film on a substrate. 10 figs.

  14. Hybrid air foil bearing with external pressurization 

    E-Print Network [OSTI]

    Park, Soongook

    2009-05-15T23:59:59.000Z

    Foil bearings are widely used for oil-free micro turbomachinery. One of the critical technical issues related to reliability of the foil bearings is a coating wear on the top foil and rotor during start/stops. Bearing ...

  15. Plasma spraying method for forming diamond and diamond-like coatings

    DOE Patents [OSTI]

    Holcombe, Cressie E. (Farragut, TN); Seals, Roland D. (Oak Ridge, TN); Price, R. Eugene (Knoxville, TN)

    1997-01-01T23:59:59.000Z

    A method and composition for the deposition of a thick layer (10) of diamond or diamond-like material. The method includes high temperature processing wherein a selected composition (12) including at least glassy carbon is heated in a direct current plasma arc device to a selected temperature above the softening point, in an inert atmosphere, and is propelled to quickly quenched on a selected substrate (20). The softened or molten composition (18) crystallizes on the substrate (20) to form a thick deposition layer (10) comprising at least a diamond or diamond-like material. The selected composition (12) includes at least glassy carbon as a primary constituent (14) and may include at least one secondary constituent (16). Preferably, the secondary constituents (16) are selected from the group consisting of at least diamond powder, boron carbide (B.sub.4 C) powder and mixtures thereof.

  16. White Bear Lake Conservation District (Minnesota)

    Broader source: Energy.gov [DOE]

    This statute establishes the White Bear Lake Conservation District, which has the authority to set water and land use regulations for the area around White Bear Lake.

  17. Supernovae: Little bear's mass loss rate

    E-Print Network [OSTI]

    Trimble, VL

    1985-01-01T23:59:59.000Z

    Williamson (Dalhousie Univ. ). Supernovae Little Bear’s massidentified and defined supernovae as a distinct astronomicalType II (hydrogen-rich) supernovae, on the other hand, end

  18. Thrust faulting in Temblor Range, Kern County, California

    SciTech Connect (OSTI)

    Simonson, R.R.

    1991-02-01T23:59:59.000Z

    Surface and subsurface studies confirm the presence of overthrusting in the Temblor Range between Gonyer Canyon and Recruit Pass. In the subsurface, three wells have penetrated the Cree fault, the Hudbay Cree' No. 1 (7,300 ft), the Frantzen Oil Company Cree' No. 1 (5,865 ft) and the Arco Cree Fee' 1A well (5,915 ft). Below the fault, 25 to 35{degree} of westerly dips on the west flank of the sub-thrust Phelps anticline are encountered. The McDonald section below the fault is comprised of siliceous fractured shale which contains live oil and gas showings. A drill-stem test of the interval from 8,247 to 8,510 ft in the Frantzen well resulted in a recovery of 1,200 ft clean 34{degree} oil and 40 MCF per day gas. The shut in pressure was 3,430 lb, which is a normal hydrostatic pressure common to the producing structures in the southern San Joaquin Valley. The equivalent of this interval has produced over 7,000 bbl of oil in the Arco Cree' 1A well. The Arco Cree Fee' No. 1A well crossed the axis of the Phelps Anticline as indicated by good dipmeter and bottomed in Lower Zemorrian at 14,512 ft total depth. This well was not drilled deep enough to reach the Point of Rocks Sand and did not test the gas showings in the lower Miocene section. In the Gonyer Canyon area, subsurface evidence indicated conditions are similar to those in the Cree area because a large structure is present below a thrust fault. It is believed that significant accumulations will be found beneath thrust faults in the eastern part of the Temblor Range where conditions are similar to those that were instrumental in forming fields such as the Elk Hills, B. V. Hills, Belgian Anticline and others.

  19. Direct thrust measurements and modelling of a radio-frequency expanding plasma thruster

    SciTech Connect (OSTI)

    Lafleur, T.; Charles, C.; Boswell, R. W. [Space Plasma, Power and Propulsion Group, Research School of Physics and Engineering, The Australian National University, Canberra ACT 0200 (Australia); Takahashi, K. [Space Plasma, Power and Propulsion Group, Research School of Physics and Engineering, The Australian National University, Canberra ACT 0200 (Australia); Department of Electrical Engineering and Computer Science, Iwate University, Morioka 020-8551 (Japan)

    2011-08-15T23:59:59.000Z

    It is shown analytically that the thrust from a simple plasma thruster (in the absence of a magnetic field) is given by the maximum upstream electron pressure, even if the plasma diverges downstream. Direct thrust measurements of a thruster are then performed using a pendulum thrust balance and a laser displacement sensor. A maximum thrust of about 2 mN is obtained at 700 W for a thruster length of 17.5 cm and a flow rate of 0.9 mg s{sup -1}, while a larger thrust of 4 mN is obtained at a similar power for a length of 9.5 cm and a flow rate of 1.65 mg s{sup -1}. The measured thrusts are in good agreement with the maximum upstream electron pressure found from measurements of the plasma parameters and in fair agreement with a simple global approach used to model the thruster.

  20. Sparkling Diamonds – Reducing High Energy in the Frozen North

    E-Print Network [OSTI]

    Feldman, J.

    2007-01-01T23:59:59.000Z

    De Beers, the undisputed world leader in diamond mining, in a typically proactive approach, completed an energy review at the Snap Lake Diamond Mine in the Northwest Territories. What makes the approach unique is that the mine is still under...

  1. Diamond Substrate Development at the Michigan State University...

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

    Diamond Substrate Development at the Michigan State University and Fraunhofer USA's Center for Coatings and Diamond Technologies May 4, 2015 11:00AM to 12:00PM Presenter Thomas...

  2. Diamond film optical, x-ray and particle detectors

    SciTech Connect (OSTI)

    Beetz, C.P.; Lincoln, B. (ATM, Inc., New Milford, CT (US)); Winn, D.R.; Segall, K.; Vasas, M.; Wall, D. (Fairfield Univ., CT (United States). Dept. of Physics)

    1991-04-01T23:59:59.000Z

    Synthetic diamond film diodes have been fabricated and tested with electromagnetic and particle radiation (above and below bandgap). In this paper, a brief discussion of potential diamond film applications in high energy and nuclear physics is presented.

  3. Mixed-mu superconducting bearings

    DOE Patents [OSTI]

    Hull, J.R.; Mulcahy, T.M.

    1998-03-03T23:59:59.000Z

    A mixed-mu superconducting bearing is disclosed including a ferrite structure disposed for rotation adjacent a stationary superconductor material structure and a stationary permanent magnet structure. The ferrite structure is levitated by said stationary permanent magnet structure. 9 figs.

  4. Mixed-mu superconducting bearings

    DOE Patents [OSTI]

    Hull, John R. (Hinsdale, IL); Mulcahy, Thomas M. (Western Springs, IL)

    1998-01-01T23:59:59.000Z

    A mixed-mu superconducting bearing including a ferrite structure disposed for rotation adjacent a stationary superconductor material structure and a stationary permanent magnet structure. The ferrite structure is levitated by said stationary permanent magnet structure.

  5. Testing and Lubrication for Single Race Bearings

    SciTech Connect (OSTI)

    Steinhoff, R.G.

    1998-03-04T23:59:59.000Z

    Three ES and H-compatible lubricants (Environment, Safety and Health) for single race bearing applications and one hybrid-material single race bearings were evaluated and compared against single race bearings with trichlorotrifluoroethane (Freon) deposition of low molecular weight polytetrafluoroethylene (PTFE) bearing lubricant extracted from Vydax{trademark}. Vydax is a product manufactured by DuPont consisting of various molecular weights of PTFE suspended in trichlorotrifluoroethane (Freon), which is an ozone-depleting solvent. Vydax has been used as a bearing lubricant in stronglink mechanisms since 1974. Hybrid bearings with silicon nitride balls and molded glass-nylon-Teflon retainers, bearings lubricated with titanium carbide (TiC) on the balls, bearings lubricated with sputtered MoS{sub 2} on races and retainers, and bearings lubricated with electrophoretically deposited MoS{sub 2} were evaluated. The bearings were maintained in a preloaded state in bearing cartridges during cycling and vibration tests. Bearings with electrophoretically deposited MoS{sub 2} performed as well as bearings lubricated with Vydax and were the best performing candidate. All candidates were suitable for low preload applications. Bearings with TiC coated balls and bearings lubricated with sputtered MoS{sub 2} on the races and retainers performed well at high preloads, though not as well as bearings lubricated with electrophoretic deposition of MoS{sub 2}. Bearings with silicon nitride balls were not suitable for high preload applications.

  6. Subsidence history of the Alabama promontory in response to Late Paleozoic Appalachian-Ouachita thrusting

    SciTech Connect (OSTI)

    Whitting, B.M.; Thomas, W.A. (Univ. of Kentucky, Lexington, KY (United States). Dept. of Geological Sciences)

    1994-03-01T23:59:59.000Z

    The Alabama promontory of North American continental crust was framed during late Precambrian-Cambrian rifting by the northeast-striking Blue Ridge rift and the northwest-striking alabama-Oklahoma transform fault. A passive margin persisted along the western side of the promontory from Cambrian to Mississippian time, but the eastern side was affected by the Taconic and Acadian orogenies. Prior to initiation of Ouachita and Appalachian (Alleghanian) thrusting, the outline of the rifted margin of continental crust on the Alabama promontory remained intact; and the late paleozoic thrust belt conformed to the shape of the promontory, defining northwest-striking Ouachita thrust faults along the southwest side of the promontory, north-striking Appalachian (Georgia-Tennessee) thrust faults on the east, and northeast-striking Appalachian (Alabama) thrust faults across the corner of the promontory. Subsidence profiles perpendicular to each of the strike domains of the thrust belt have been constructed by calculating total subsidence from decompacted thickness of the synorogenic sedimentary deposits. The profile perpendicular to the Ouachita thrust belt shows increasing subsidence rates through time and toward the thrust front, indicating the classic signature of an orogenic foreland basin. The profile perpendicular to the Georgia-Tennessee Appalachian thrust belt similarly shows increasing subsidence rates through time and toward the orogenic hinterland. These quantitative results support the conclusion that Black Warrior basin subsidence is tectonically rather than sedimentologically driven, and the timing of subsidence events reported here has implications for regional tectonic models.

  7. Study of Electron Transport and Amplification in Diamond

    SciTech Connect (OSTI)

    Muller, Erik M.; Ben-Zvi, Ilan

    2013-03-31T23:59:59.000Z

    As a successful completion of this award, my group has demonstrated world-leading electron gain from diamond for use in a diamond-amplified photocathode. Also, using high-resolution photoemission measurements we were able to uncover exciting new physics of the electron emission mechanisms from hydrogen terminated diamond. Our work, through the continued support of HEP, has resulted in a greater understanding of the diamond material science, including current limits, charge transport modeling, and spatial uniformity.

  8. Thrust and efficiency model for electron-driven magnetic nozzles

    SciTech Connect (OSTI)

    Little, Justin M.; Choueiri, Edgar Y. [Electric Propulsion and Plasma Dynamics Laboratory, Princeton University, Princeton, New Jersey 08544 (United States)] [Electric Propulsion and Plasma Dynamics Laboratory, Princeton University, Princeton, New Jersey 08544 (United States)

    2013-10-15T23:59:59.000Z

    A performance model is presented for magnetic nozzle plasmas driven by electron thermal expansion to investigate how the thrust coefficient and beam divergence efficiency scale with the incoming plasma flow and magnetic field geometry. Using a transformation from cylindrical to magnetic coordinates, an approximate analytical solution is derived to the axisymmetric two-fluid equations for a collisionless plasma flow along an applied magnetic field. This solution yields an expression for the half-width at half-maximum of the plasma density profile in the far-downstream region, from which simple scaling relations for the thrust coefficient and beam divergence efficiency are derived. It is found that the beam divergence efficiency is most sensitive to the density profile of the flow into the nozzle throat, with the highest efficiencies occurring for plasmas concentrated along the nozzle axis. Increasing the expansion ratio of the magnetic field leads to efficiency improvements that are more pronounced for incoming plasmas that are not concentrated along the axis. This implies that the additional magnet required to increase the expansion ratio may be worth the added complexity for plasma sources that exhibit poor confinement.

  9. Comparative evaluation of CVD diamond technologies

    SciTech Connect (OSTI)

    Anthony, T.R. [General Electric Corporate Research & Development Center, Schenectady, NY (United States)

    1993-01-01T23:59:59.000Z

    Chemical vapor deposition (CVD) of diamonds occurs from hydrogen-hydrocarbon gas mixtures in the presence of atomic hydrogen at subatmospheric pressures. Most CVD methods are based on different means of generating and transporting atomic hydrogen in a particular system. Evaluation of these different techniques involves their capital costs, material costs, energy costs, labor costs and the type and quality of diamond that they produce. Currently, there is no universal agreement on which is the best technique and technique selection has been largely driven by the professional background of the user as well as the particular application of interest. This article discusses the criteria for evaluating a process for low-pressure deposition of diamond. Next, a brief history of low-pressure diamond synthesis is reviewed. Several specific processes are addressed, including the hot filament process, hot filament electron-assisted chemical vapor deposition, and plasma generation of atomic hydrogen by glow discharge, microwave discharge, low pressure radio frequency discharge, high pressure DC discharge, high pressure microwave discharge jets, high pressure RF discharge, and high and low pressure flames. Other types of diamond deposition methods are also evaluated. 101 refs., 15 figs.

  10. Etching of polycrystalline diamond films by electron beam assisted plasma

    E-Print Network [OSTI]

    Rocca, Jorge J.

    Etching of polycrystalline diamond films by electron beam assisted plasma Koji Kobashi, Shigeaki) Polycrystalline diamond films were processed in a direct current plasma produced by a self-focused electron beam that the etching apparatus used was capable of forming at least a 5-mm wide pattern of polycrystalline diamond film

  11. Hydrostatic bearings for a turbine fluid flow metering device

    DOE Patents [OSTI]

    Fincke, James R. (Rigby, ID)

    1982-01-01T23:59:59.000Z

    A rotor assembly fluid metering device has been improved by development of a hydrostatic bearing fluid system which provides bearing fluid at a common pressure to rotor assembly bearing surfaces. The bearing fluid distribution system produces a uniform film of fluid between bearing surfaces and allows rapid replacement of bearing fluid between bearing surfaces, thereby minimizing bearing wear and corrosion.

  12. Hydrostatic bearings for a turbine fluid flow metering device

    DOE Patents [OSTI]

    Fincke, J.R.

    1982-05-04T23:59:59.000Z

    A rotor assembly fluid metering device has been improved by development of a hydrostatic bearing fluid system which provides bearing fluid at a common pressure to rotor assembly bearing surfaces. The bearing fluid distribution system produces a uniform film of fluid between bearing surfaces and allows rapid replacement of bearing fluid between bearing surfaces, thereby minimizing bearing wear and corrosion. 3 figs.

  13. Hydrogen-doped cubic diamond and the crystal structure of n-diamond Bin Wen a,b,

    E-Print Network [OSTI]

    Melnik, Roderick

    Hydrogen-doped cubic diamond and the crystal structure of n-diamond Bin Wen a,b, , Roderick Melnik. In particular, hydrogen concen- tration dependent elastic constants and lattice parameters for the H-doped diamond have been analyzed. Our results indicate that when the hydrogen concentration is less than 19 at

  14. Wear of diamond and diamondlike carbon films.

    SciTech Connect (OSTI)

    Erdemir, A.; Energy Technology

    2002-01-01T23:59:59.000Z

    Detailed tribological studies on diamond and diamond-like carbon (DLC) films have confirmed that these films are inherently self-lubricating and resistant to abrasive, adhesive and corrosive wear. Because of their high chemical inertness, they are also resistant to corrosion and oxidation (even at elevated temperatures). The combination of such exceptional qualities in these films makes them ideal for a wide range of demanding tribological applications (such as microelectromechanical systems, cutting tools, mechanical seals, magnetic hard disks, etc.). These films, available for more than three decades, have been used extensively for tooling and magnetic hard disk applications. Their potential in other application areas is currently being explored around the world. With the development of new and more robust deposition methods in recent years, it is envisioned that the production of high quality diamond and DLC films will become very cost effective and highly reliable for large-scale applications in the transportation and manufacturing sectors. In this paper, sliding wear mechanisms of diamond and DLC films will be presented. Specifically, it will be shown that, in general the wear of these films is extremely low (mainly because of their exceptional hardness and low friction characteristics). Specific test conditions established during each sliding test, however, may dramatically affect the wear performance of certain diamond and DLC films. One of the dominant wear mechanismsrelates to a phase transformation that is primarily the result of very high mechanical and thermal loadings of sliding contact interfaces. The transformation products (such as disordered graphite) trapped at the sliding interface may transfer to themating surface and significantly affect friction and wear. This paper describes, in terms of structural and fundamental tribological knowledge, the ideal film microstructures and chemistry, as well as operational conditions under which diamond and DLC films perform the best and provide superlow friction and wear properties in sliding tribological applications.

  15. Method of improving field emission characteristics of diamond thin films

    DOE Patents [OSTI]

    Krauss, A.R.; Gruen, D.M.

    1999-05-11T23:59:59.000Z

    A method of preparing diamond thin films with improved field emission properties is disclosed. The method includes preparing a diamond thin film on a substrate, such as Mo, W, Si and Ni. An atmosphere of hydrogen (molecular or atomic) can be provided above the already deposited film to form absorbed hydrogen to reduce the work function and enhance field emission properties of the diamond film. In addition, hydrogen can be absorbed on intergranular surfaces to enhance electrical conductivity of the diamond film. The treated diamond film can be part of a microtip array in a flat panel display. 3 figs.

  16. Method of improving field emission characteristics of diamond thin films

    DOE Patents [OSTI]

    Krauss, Alan R. (Naperville, IL); Gruen, Dieter M. (Downer Grove, IL)

    1999-01-01T23:59:59.000Z

    A method of preparing diamond thin films with improved field emission properties. The method includes preparing a diamond thin film on a substrate, such as Mo, W, Si and Ni. An atmosphere of hydrogen (molecular or atomic) can be provided above the already deposited film to form absorbed hydrogen to reduce the work function and enhance field emission properties of the diamond film. In addition, hydrogen can be absorbed on intergranular surfaces to enhance electrical conductivity of the diamond film. The treated diamond film can be part of a microtip array in a flat panel display.

  17. Cartesian thrust allocation algorithm with variable direction thrusters, turn rate limits and singularity avoidance

    E-Print Network [OSTI]

    Johansen, Tor Arne

    propellers [5], power consumption optimization [6] and other power management-related issues [7], [8], [9 thrust slowly and/or reverse the direction of the generated thrust, minimizing the power consumption should normally be included. This func- tionality requires significant numerical calculations for each

  18. Middle-late Miocene ( 10 Ma) formation of the Main Boundary thrust in the western Himalaya

    E-Print Network [OSTI]

    Kurapov, Alexander

    Ma in well-dated stratigraphic sections from Pakistan to Nepal across the Indo-Gangetic foreland derived from the hanging wall of the Main Boundary thrust indicates that source-area uplift and denudation thrust in the Kohat region of northwest Pakistan indicate that rapid cooling below 105 C between 8 and 10

  19. Thermal Effects on Inverted Pendulum Thrust Stands for Steady-state High-power Plasma Thrusters

    E-Print Network [OSTI]

    Choueiri, Edgar

    Thermal Effects on Inverted Pendulum Thrust Stands for Steady-state High-power Plasma Thrusters A, 2003 Abstract Thermal effects on direct measurements of the thrust produced by steady-state, high-power. Associate Fellow, AIAA. §Presented at the 39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, 20-23rd

  20. The Role of Climate in the Deformation of a Fold and Thrust Belt

    E-Print Network [OSTI]

    Steen, Sean Kristian

    2012-02-14T23:59:59.000Z

    and uplifted in large folds. In order to test this and related ideas in a natural example, we have compared modeled rainfall to measured thrust sheet displacement, geometry, and internal deformation in the Appalachian fold and thrust belt. We use mean annual...

  1. Thermodynamic modelling of Cr-bearing garnets with implications for diamond inclusions and peridotite xenoliths

    E-Print Network [OSTI]

    , Zürich, Switzerland e Geological Survey of Western Australia, Mineral House, 100 Plain Street, East Perth, WA 6004, Australia a b s t r a c ta r t i c l e i n f o Article history: Received 8 September 2008 using free energy minimization techniques. Here we present calculated phase relations in Cr-rich mantle

  2. Ultrarapid exhumation of ultrahigh-pressure diamond-bearing metasedimentary rocks of the Kokchetav Massif, Kazakhstan?

    E-Print Network [OSTI]

    Hacker, Bradley R.

    Massif, Kazakhstan? $ Bradley R. Hackera,*, Andrew Calverta , R.Y. Zhangb , W. Gary Ernstb , J.G. Lioub, Kazakhstan (Fig. 1), is a large ( f 10­15 Â 150 km) ultrahigh-pressure terrane, distinctive because

  3. Data Archive and Portal Thrust Area Strategy Report

    SciTech Connect (OSTI)

    Sivaraman, Chitra; Stephan, Eric G.; Macduff, Matt C.; Hagler, Clay D.

    2014-09-30T23:59:59.000Z

    This report describes the Data Archive and Portal (DAP), a key capability of the U.S. Department of Energy's Atmosphere to Electron (A2e) initiative. The DAP Thrust Area Planning Group was organized to develop a plan for deploying this capability. Primarily, the report focuses on a distributed system--a DOE Wind Cloud--that functions as a repository for all A2e data. The Wind Cloud will be accessible via an open, easy-to-navigate user interface that facilitates community data access, interaction, and collaboration. DAP management will work with the community, industry, and international standards bodies to develop standards for wind data and to capture important characteristics of all data in the Wind Cloud.

  4. Ultrasensitive Magnetometry and Imaging with NV Diamond 

    E-Print Network [OSTI]

    Kim, Changdong

    2011-08-08T23:59:59.000Z

    NV centers in a diamond are proving themselves to be good building blocks for quantum information, electron spin resonance (ESR) imaging, and sensor applications. The key feature of the NV is that it has an electron spin that can be polarized...

  5. Magnetic bearing element with adjustable stiffness

    DOE Patents [OSTI]

    Post, Richard F

    2013-11-12T23:59:59.000Z

    A compact magnetic bearing element is provided which is made of permanent magnet discs configured to be capable of the adjustment of the bearing stiffness and levitation force over a wide range.

  6. Self-bearing motor design & control

    E-Print Network [OSTI]

    Imani Nejad, Mohammad

    2013-01-01T23:59:59.000Z

    This thesis presents the design, implementation and control of a new class of self-bearing motors. The primary thesis contributions include the design and experimental demonstration of hysteresis self-bearing motors, novel ...

  7. Rubber bearings for precision positioning systems

    E-Print Network [OSTI]

    Barton Martinelli, Augusto E

    2005-01-01T23:59:59.000Z

    In this thesis we investigate the use of thin rubber sheets or laminates of metal and rubber sheets as bearings in precision positioning systems. Such bearings have the potential to replace more conventional flexures ...

  8. Design of a low cost hydrostatic bearing

    E-Print Network [OSTI]

    Wong, Anthony Raymond

    2012-01-01T23:59:59.000Z

    This thesis presents the design and manufacturing method for a new surface self compensating hydrostatic bearing. A lumped resistance model was used to analyze the performance of the bearing and provide guidance on laying ...

  9. In Situ Tribo-Electrochemical Characterization of Diamond-Containing Materials

    E-Print Network [OSTI]

    Xiao, Huaping

    2014-07-31T23:59:59.000Z

    , electrochemical evaluation and characterization of diamond-reinforced ceramic composites (DRCC), thin nanocrystalline diamond (NCD) film, thin microcrystalline diamond (MCD) film and their functionalized derivatives. After the tribotest, phase transformation from...

  10. Deformation associated with transverse-thrust ramps: a field and experimental study 

    E-Print Network [OSTI]

    McCaskey, Michael Donald

    1982-01-01T23:59:59.000Z

    direction. 2. Marias Pass Location Maps. (A) Generalized geologic map showing location of Marias Pass, and the Lewis Thrust, and (B) schematic diagram illustrates ramp geometries for the Lewis Thrust in the Marias Pass region. 3. Geometry of dip ramp... of Marias Pass showing the location of study sites A, 8, C, and the dip-ramp site at Two Medicine Lake . 85 24. Contour map of the Lewis Thrust surface in the Marias Pass area constructed from sur- vey sites (measured in feet above sea level in order...

  11. Deformation associated with transverse-thrust ramps: a field and experimental study

    E-Print Network [OSTI]

    McCaskey, Michael Donald

    1982-01-01T23:59:59.000Z

    direction. 2. Marias Pass Location Maps. (A) Generalized geologic map showing location of Marias Pass, and the Lewis Thrust, and (B) schematic diagram illustrates ramp geometries for the Lewis Thrust in the Marias Pass region. 3. Geometry of dip ramp... of Marias Pass showing the location of study sites A, 8, C, and the dip-ramp site at Two Medicine Lake . 85 24. Contour map of the Lewis Thrust surface in the Marias Pass area constructed from sur- vey sites (measured in feet above sea level in order...

  12. Characteristics of displacement transfer zones associated with thrust faults / by Arthur Francis Xavier O'Keefe

    E-Print Network [OSTI]

    O'Keefe, Arthur Francis Xavier

    1980-01-01T23:59:59.000Z

    back limb fault and then develops into s. drag fold on the underlying plate. The lower thrust dies by losing displacement until it becomes a fore-limb . hrust in a mino" anticline which plunges out under . he higher thrust (Figure 2). drag olo... is compared with two physical models developed by Gardner and Spang (1973). Their fi. st model involves a conical fold in the upper plate of the lowez- thzust with the point of the cone at the termination of the higher thrust . The fold then opens along...

  13. Very low friction for diamond sliding on diamond in water Plasma Processing Laboratory, Auburn University, 200 Broun Hall, Auburn, Alabama 36849

    E-Print Network [OSTI]

    Tzeng, Yonhua

    on a polished polycrystalline chemically vapor deposited diamond film in water at a speed of 0.05 mm/s underVery low friction for diamond sliding on diamond in water Y. Tzeng Plasma Processing Laboratory for publication 17 September 1993) This letter reports the lowest coefficient of friction measured for diamond

  14. Workshop on diamond and diamond-like-carbon films for the transportation industry

    SciTech Connect (OSTI)

    Nichols, F.A.; Moores, D.K. [eds.

    1993-01-01T23:59:59.000Z

    Applications exist in advanced transportation systems as well as in manufacturing processes that would benefit from superior tribological properties of diamond, diamond-like-carbon and cubic boron nitride coatings. Their superior hardness make them ideal candidates as protective coatings to reduce adhesive, abrasive and erosive wear in advanced diesel engines, gas turbines and spark-ignited engines and in machining and manufacturing tools as well. The high thermal conductivity of diamond also makes it desirable for thermal management not only in tribological applications but also in high-power electronic devices and possibly large braking systems. A workshop has been recently held at Argonne National Laboratory entitled ``Diamond and Diamond-Like-Carbon Films for Transportation Applications`` which was attended by 85 scientists and engineers including top people involved in the basic technology of these films and also representatives from many US industrial companies. A working group on applications endorsed 18 different applications for these films in the transportation area alone. Separate abstracts have been prepared.

  15. Method to fabricate micro and nano diamond devices

    DOE Patents [OSTI]

    Morales, Alfredo M; Anderson, Richard J; Yang, Nancy Y. C.; Skinner, Jack L; Rye, Michael J

    2014-10-07T23:59:59.000Z

    A method including forming a diamond material on the surface of a substrate; forming a first contact and a separate second contact; and patterning the diamond material to form a nanowire between the first contact and the second contact. An apparatus including a first contact and a separate second contact on a substrate; and a nanowire including a single crystalline or polycrystalline diamond material on the substrate and connected to each of the first contact and the second contact.

  16. Thin film superconductor magnetic bearings

    DOE Patents [OSTI]

    Weinberger, Bernard R. (Avon, CT)

    1995-12-26T23:59:59.000Z

    A superconductor magnetic bearing includes a shaft (10) that is subject to a load (L) and rotatable around an axis of rotation, a magnet (12) mounted to the shaft, and a stator (14) in proximity to the shaft. The stator (14) has a superconductor thin film assembly (16) positioned to interact with the magnet (12) to produce a levitation force on the shaft (10) that supports the load (L). The thin film assembly (16) includes at least two superconductor thin films (18) and at least one substrate (20). Each thin film (18) is positioned on a substrate (20) and all the thin films are positioned such that an applied magnetic field from the magnet (12) passes through all the thin films. A similar bearing in which the thin film assembly (16) is mounted on the shaft (10) and the magnet (12) is part of the stator (14) also can be constructed.

  17. amorphous diamond-like carbon: Topics by E-print Network

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

    2 Atmospheric plasma deposition of diamond-like carbon coatings Angela M. Ladwig a,b, Materials Science Websites Summary: Atmospheric plasma deposition of diamond-like carbon...

  18. adherent diamond-like carbon: Topics by E-print Network

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

    2 Atmospheric plasma deposition of diamond-like carbon coatings Angela M. Ladwig a,b, Materials Science Websites Summary: Atmospheric plasma deposition of diamond-like carbon...

  19. Precision diamond grinding of ceramics and glass

    SciTech Connect (OSTI)

    Smith, S.; Paul, H.; Scattergood, R.O.

    1988-12-01T23:59:59.000Z

    A new research initiative will be undertaken to investigate the effect of machine parameters and material properties on precision diamond grinding of ceramics and glass. The critical grinding depth to initiate the plastic flow-to-brittle fracture regime will be directly measured using plunge-grind tests. This information will be correlated with machine parameters such as wheel bonding and diamond grain size. Multiaxis grinding tests will then be made to provide data more closely coupled with production technology. One important aspect of the material property studies involves measuring fracture toughness at the very short crack sizes commensurate with grinding damage. Short crack toughness value`s can be much less than the long-crack toughness values measured in conventional fracture tests.

  20. Measurement of tool forces in diamond turning

    SciTech Connect (OSTI)

    Drescher, J.; Dow, T.A.

    1988-12-01T23:59:59.000Z

    A dynamometer has been designed and built to measure forces in diamond turning. The design includes a 3-component, piezoelectric transducer. Initial experiments with this dynamometer system included verification of its predicted dynamic characteristics as well as a detailed study of cutting parameters. Many cutting experiments have been conducted on OFHC Copper and 6061-T6 Aluminum. Tests have involved investigation of velocity effects, and the effects of depth and feedrate on tool forces. Velocity has been determined to have negligible effects between 4 and 21 m/s. Forces generally increase with increasing depth of cut. Increasing feedrate does not necessarily lead to higher forces. Results suggest that a simple model may not be sufficient to describe the forces produced in the diamond turning process.

  1. Luminescence Dating `I also brought it [a diamond] to some

    E-Print Network [OSTI]

    Sengun, Mehmet Haluk

    Includes ­ Thermoluminescence (TL), Optically stimulated luminescence (OSL), infrared stimulatedLuminescence Dating `I also brought it [a diamond] to some kind of glimmering light by taking

  2. Radiation Hardness and Linearity Studies of CVD Diamonds

    E-Print Network [OSTI]

    T. Behnke; M. Doucet; N. Ghodbane; A. Imhof

    2002-12-09T23:59:59.000Z

    We report on the behavior of CVD diamonds under intense electromagnetic radiation and on the response of the detector to high density of deposited energy. Diamonds have been found to remain unaffected after doses of 10 MGy of MeV-range photons and the diamond response to energy depositions of up to 250 GeV/cm^3 has been found to be linear to better than 2 %. These observations make diamond an attractive detector material for a calorimeter in the very forward region of the detector proposed for TESLA.

  3. Robust Diamond-Based RF Switch Yields Enhanced Communication...

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

    Robust Diamond-Based RF Switch Yields Enhanced Communication Capabilities Technology available for licesning: A radio frequency (RF) microelectromechanical system (MEMS) switch...

  4. amorphous diamond films: Topics by E-print Network

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

    simulations of the nanometer-scale indentation of amorphous-carbon thin films Materials Science Websites Summary: , and lattice constants of both solid-state diamond and...

  5. Microsoft Word - DiamondB_Easement_CX.doc

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

    Cecilia Brown Project Manager - KEWM-4 Proposed Action: Provision of funds to Montana Fish, Wildlife & Parks to purchase the Diamond B conservation easement. Fish and Wildlife...

  6. Argonne researchers develop two new diamond inventions | Argonne...

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

    develop two new diamond inventions By Jared Sagoff * October 10, 2014 Tweet EmailPrint ARGONNE, IL - Researchers at the US Department of Energy's Argonne National Laboratory have...

  7. Electroless nickel: an important coating for diamond turning applications

    SciTech Connect (OSTI)

    Dini, J.W.

    1980-09-24T23:59:59.000Z

    Diamond turning is the use of a single-point diamond tool on a precision lathe under very precisely controlled machine and environmental conditions to fabricate finished components. With a machine presently available at LLNL a part accuracy between 0.05 and 1.0 ..mu..m (2 and 40 millionths of an inch) is obtainable. Coatings offer significant advantages for diamond turning applications inasmuch as they can be applied to lightweight substrates such as aluminum or beryllium. One of the most used coatings for diamond turning applications is electroless nickel. Purpose of this paper is to document case histories of such applications and suggest areas for future work.

  8. Synthesis and characterization of a nanocrystalline diamond aerogel

    E-Print Network [OSTI]

    Pauzauskie, Peter J.

    2012-01-01T23:59:59.000Z

    nanocrystalline diamond aerogel Peter J. Pauzauskie a,1,2 ,Laboratory, Berkeley, CA 94720 Aerogel materials have myriadcreating a nanodiamond aerogel matrix has remained an

  9. amorphous diamond flat: Topics by E-print Network

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

    32 Synthesis and characterization of single-wall carbon nanotubeamorphous diamond thin-film composites Materials Science Websites Summary: . Ultrahard, transparent,...

  10. advanced diamond product: Topics by E-print Network

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

    polycrystalline and single-crystal chemical vapor deposition diamonds follow a single damage curve allowing one to extrapolate their performance as a function of dose. W....

  11. Valve assembly having remotely replaceable bearings

    DOE Patents [OSTI]

    Johnson, Evan R. (San Diego, CA); Tanner, David E. (Poway, CA)

    1980-01-01T23:59:59.000Z

    A valve assembly having remotely replaceable bearings is disclosed wherein a valve disc is supported within a flow duct for rotation about a pair of axially aligned bearings, one of which is carried by a spindle received within a diametral bore in the valve disc, and the other of which is carried by a bearing support block releasably mounted on the duct circumferentially of an annular collar on the valve disc coaxial with its diametrical bore. The spindle and bearing support block are adapted for remote removal to facilitate servicing or replacement of the valve disc support bearings.

  12. Power Rental Market to Receive Thrust from Asia-Pacific, to Rise...

    Open Energy Info (EERE)

    Thrust from Asia-Pacific, to Rise to US20.64 billion by 2019 Home > Groups > Increase Natural Gas Energy Efficiency John55364's picture Submitted by John55364(95) Contributor...

  13. At several localities around the world, thrust belts have developed on both sides of

    E-Print Network [OSTI]

    ten Brink, Uri S.

    of the Eastern Greater Antilles arc (Hispaniola and Puerto Rico), whereas a south-verging thrust belt called; Fig. 2). The Eastern Greater Antilles arc (Hispaniola and Puerto Rico) of the northeastern Caribbean

  14. A Diamond Nanowire Single Photon Antenna

    E-Print Network [OSTI]

    Tom Babinec; Birgit J. M. Hausmann; Mughees Khan; Yinan Zhang; Jero Maze; Philip R. Hemmer; Marko Loncar

    2009-10-28T23:59:59.000Z

    The development of a robust light source that emits one photon at a time is an outstanding challenge in quantum science and technology. Here, at the transition from many to single photon optical communication systems, fully quantum mechanical effects may be utilized to achieve new capabilities, most notably perfectly secure communication via quantum cryptography. Practical implementations place stringent requirements on the device properties, including stable photon generation, room temperature operation, and efficient extraction of many photons. Single photon light emitting devices based on fluorescent dye molecules, quantum dots, and carbon nanotube material systems have all been explored, but none have simultaneously demonstrated all criteria. Here, we describe the design, fabrication, and characterization of a bright source of single photons consisting of an individual Nitrogen-vacancy color center (NV center) in a diamond nanowire operating in ambient conditions. The nanowire plays a positive role in increasing the number of single photons collected from the NV center by an order of magnitude over devices based on bulk diamond crystals, and allows operation at an order of magnitude lower power levels. This result enables a new class of nanostructured diamond devices for room temperature photonic and quantum information processing applications, and will also impact fields as diverse as biological and chemical sensing, opto-mechanics, and scanning-probe microscopy.

  15. Structural discordance between neogene detachments and frontal sevier thrusts, central Mormon Mountains, southern Nevada

    E-Print Network [OSTI]

    Wernicke, Brian; Walker, J. Douglas; Beaufait, Mark S.

    1985-02-01T23:59:59.000Z

    Bonanza King Formation. Between the Keystone-Muddy Mountain and Gass Peak-Wheeler Pass thrusts is a broad, regional synclinorium consisting of miogeoclinal rocks which have been folded and faulted on small thrusts. N W E s Fig. 6. Axes...-groned, thin-to rneclum- bedded chert), toward top fossaliferous, locally cross-laminated SULTAN LIMESTONE (216 m) CRYSTAL PASS LIMESTONE (69m) Lrnestone, hght c, lroy, ophonit, laminated sandstone marker bedneer top VALENTINE LIMESTONE (79m) Lm...

  16. Characteristics of displacement transfer zones associated with thrust faults / by Arthur Francis Xavier O'Keefe 

    E-Print Network [OSTI]

    O'Keefe, Arthur Francis Xavier

    1980-01-01T23:59:59.000Z

    CHARAC 'ERZSTZCS OF DZSPLACENENT TRANSFER 'ZONES ASSOCIATED WI H THRUST FAULTS A Thesis by ARTHUR FRANCIS XAVIER O&HEEFE Submitted to the Graduate College of Texas AlkM University in partial fulfillment of the requirement for the degree... of NASTER OF SCIENCE August 1990 Idaho or Subrent: Geology CHARACTERISTICS QF DISPLACEMENT TRANSFER ZONES ASSOCIATED NITS THRUST FAULTS A Thesis by ARTHUR FRANCIS XAVIER 0 'KEEFE Approved ss to style and content by: (Co-chairman of' Commi. tee...

  17. Hydrostatic bearings for a turbine fluid flow metering device

    DOE Patents [OSTI]

    Fincke, J.R.

    1980-05-02T23:59:59.000Z

    A rotor assembly fluid metering device has been improved by development of a hydrostatic bearing fluid system which provides bearing fluid at a common pressure to rotor assembly bearing surfaces. The bearing fluid distribution system produces a uniform film of fluid distribution system produces a uniform film of fluid between bearing surfaces and allows rapid replacement of bearing fluid between bearing surfaces, thereby minimizing bearing wear and corrosion.

  18. Panel 2 - properties of diamond and diamond-like-carbon films

    SciTech Connect (OSTI)

    Blau, P.J.; Clausing, R.E. [Oak Ridge National Lab., TN (United States); Ajayi, O.O.; Liu, Y.Y.; Purohit, A. [Argonne National Lab., IL (United States); Bartelt, P.F. [Deere & Co., Moline, IL (United States); Baughman, R.H. [Allied Signal, Morristown, NJ (United States); Bhushan, B. [Ohio State Univ., Columbus (United States); Cooper, C.V. [United Technologies Research Center, East Hartford, CT (United States); Dugger, M.T. [Sandia National Laboratories, Albuquerque, NM (United States); Freedman, A. [Aerodyne Research, Inc., Billerica, MA (United States); Larsen-Basse, J. [National Science Foundation, Washington, DC (United States); McGuire, N.R. [Caterpillar, Peoria, IL (United States); Messier, R.F. [Pennsylvania State Univ., University Park (United States); Noble, G.L.; Ostrowki, M.H. [John Crane, Inc., Morton Grove, IL (United States); Sartwell, B.D. [Naval Research Lab., Washington, DC (United States); Wei, R. [Colorado State Univ., Fort Collins (United States)

    1993-01-01T23:59:59.000Z

    This panel attempted to identify and prioritize research and development needs in determining the physical, mechanical and chemical properties of diamond and diamond-like-carbon films (D/DLCF). Three specific goals were established. They were: (1) To identify problem areas which produce concern and require a better knowledge of D/DLCF properties. (2) To identify and prioritize key properties of D/DLCF to promote transportation applications. (3) To identify needs for improvement in properties-measurement methods. Each of these goals is addressed subsequently.

  19. Patterning of nanocrystalline diamond films for diamond microstructures useful in MEMS and other devices

    DOE Patents [OSTI]

    Gruen, Dieter M. (Downers Grove, IL); Busmann, Hans-Gerd (Bremen, DE); Meyer, Eva-Maria (Bremen, DE); Auciello, Orlando (Bolingbrook, IL); Krauss, Alan R. (late of Naperville, IL); Krauss, Julie R. (Naperville, IL)

    2004-11-02T23:59:59.000Z

    MEMS structure and a method of fabricating them from ultrananocrystalline diamond films having average grain sizes of less than about 10 nm and feature resolution of less than about one micron . The MEMS structures are made by contacting carbon dimer species with an oxide substrate forming a carbide layer on the surface onto which ultrananocrystalline diamond having average grain sizes of less than about 10 nm is deposited. Thereafter, microfabrication process are used to form a structure of predetermined shape having a feature resolution of less than about one micron.

  20. Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina

    E-Print Network [OSTI]

    Hilley, George

    -and-thrust belt, Argentina G. E. Hilley1 and M. R. Strecker Institut fu¨r Geowissenschaften, Universita¨t Potsdam, Potsdam, Germany V. A. Ramos Department de Geologia, Universidad de Buenos Aires, Buenos Aires, Argentina in the central Andes of Argentina where wedge development over time is well constrained. We solve

  1. children in Old Diamond experiencing asthma or bronchitis.

    E-Print Network [OSTI]

    Baltisberger, Jay H.

    the connection between human health and environmental well-being. Held on November 2, 2006, Environmental Justice plant in the neighborhood of Old Diamond in Norco, Louisiana. Diamond, a historically black community to their basic needs: clean water, healthy food, non-toxic communities, open space, safe energy, and equitable

  2. Yield Optimization of Nitrogen Vacancy Centers in Diamond

    E-Print Network [OSTI]

    Chen, Jeson

    2012-10-19T23:59:59.000Z

    To fully exploit the capability of NV centers in diamond as magnetic sensors and quantum bits, the optimum production recipe as well as the method to enhance its optical performance has been studied in this work. The NV centers in bulk diamond were...

  3. Electrically conductive polycrystalline diamond and particulate metal based electrodes

    DOE Patents [OSTI]

    Swain, Greg M.; Wang, Jian

    2005-04-26T23:59:59.000Z

    An electrically conducting and dimensionally stable diamond (12, 14) and metal particle (13) electrode produced by electrodepositing the metal on the diamond is described. The electrode is particularly useful in harsh chemical environments and at high current densities and potentials. The electrode is particularly useful for generating hydrogen, and for reducing oxygen and oxidizing methanol in reactions which are of importance in fuel cells.

  4. NEW HIGH STRENGTH AND FASTER DRILLING TSP DIAMOND CUTTERS

    SciTech Connect (OSTI)

    Robert Radtke

    2006-01-31T23:59:59.000Z

    The manufacture of thermally stable diamond (TSP) cutters for drill bits used in petroleum drilling requires the brazing of two dissimilar materials--TSP diamond and tungsten carbide. The ENDURUS{trademark} thermally stable diamond cutter developed by Technology International, Inc. exhibits (1) high attachment (shear) strength, exceeding 345 MPa (50,000 psi), (2) TSP diamond impact strength increased by 36%, (3) prevents TSP fracture when drilling hard rock, and (4) maintains a sharp edge when drilling hard and abrasive rock. A novel microwave brazing (MWB) method for joining dissimilar materials has been developed. A conventional braze filler metal is combined with microwave heating which minimizes thermal residual stress between materials with dissimilar coefficients of thermal expansion. The process results in preferential heating of the lower thermal expansion diamond material, thus providing the ability to match the thermal expansion of the dissimilar material pair. Methods for brazing with both conventional and exothermic braze filler metals have been developed. Finite element modeling (FEM) assisted in the fabrication of TSP cutters controllable thermal residual stress and high shear attachment strength. Further, a unique cutter design for absorbing shock, the densification of otherwise porous TSP diamond for increased mechanical strength, and diamond ion implantation for increased diamond fracture resistance resulted in successful drill bit tests.

  5. Method and apparatus for diamond wire cutting of metal structures

    DOE Patents [OSTI]

    Parsells, Robert; Gettelfinger, Geoff; Perry, Erik; Rule, Keith

    2005-04-19T23:59:59.000Z

    A method and apparatus for diamond wire cutting of metal structures, such as nuclear reactor vessels, is provided. A diamond wire saw having a plurality of diamond beads with beveled or chamfered edges is provided for sawing into the walls of the metal structure. The diamond wire is guided by a plurality of support structures allowing for a multitude of different cuts. The diamond wire is cleaned and cooled by CO.sub.2 during the cutting process to prevent breakage of the wire and provide efficient cutting. Concrete can be provided within the metal structure to enhance cutting efficiency and reduce airborne contaminants. The invention can be remotely controlled to reduce exposure of workers to radioactivity and other hazards.

  6. Nanocrystalline diamond synthesized from C60 Natalia Dubrovinskaia*, Leonid Dubrovinsky, Falko Langenhorst,

    E-Print Network [OSTI]

    Jacobsen, Steven D.

    , the synthesis of nanocrystalline films of diamond-like carbon (DLC) and polycrystalline cubic diamond have display excellent properties as surface coating for metals [9]. Polycrystalline cubic diamond synthesisedNanocrystalline diamond synthesized from C60 Natalia Dubrovinskaia*, Leonid Dubrovinsky, Falko

  7. The electrical and optical properties of thin lm diamond implanted with silicon

    E-Print Network [OSTI]

    Kolodzey, James

    :Si alloys were formed by the implantation of Si into polycrystalline diamond ®lms grown by che- mical vaporThe electrical and optical properties of thin ®lm diamond implanted with silicon K.J. Roea,* , J of diamond make it an attractive material for use in extreme conditions. Diamond devices have been fabricated

  8. Integrated High-Quality Factor Optical Resonators in Diamond B. J. M. Hausmann,,

    E-Print Network [OSTI]

    Loncar, Marko

    -performance devices places stringent requirements on the diamond film quality. For example, polycrystalline diamond associated with polycrystalline and ion-sliced single crystal diamond films. For example, low-loss opticalIntegrated High-Quality Factor Optical Resonators in Diamond B. J. M. Hausmann,, I. B. Bulu,, P. B

  9. Reduced thermal resistance of the silicon-synthetic diamond composite substrates at elevated temperatures

    E-Print Network [OSTI]

    /Si sub- strates, depends on the polycrystalline-diamond grain size, diamond layer thicknessReduced thermal resistance of the silicon-synthetic diamond composite substrates at elevated of synthetic diamond-silicon composite substrates. Although composite substrates are more thermally resistive

  10. Mantle-related carbonados? Geochemical insights from diamonds from the Dachine komatiite (French Guiana)

    E-Print Network [OSTI]

    Cartigny, Pierre

    Carbonado is a unique type of polycrystalline diamond characterised, among others, by 13 C-depleted isotope carbonado diamonds are polycrystalline, but the reciprocal is not true, i.e. a polycrystalline diamond is not necessarily a carbonado. Most classifications for polycrystalline diamonds are established according

  11. THE ELECTRICAL AND OPTICAL PROPERTIES OF THIN FILM DIAMOND IMPLANTED WITH SILICON

    E-Print Network [OSTI]

    Kolodzey, James

    devices. The C:Si alloys were formed by the implantation of Si into polycrystalline diamond films grownTHE ELECTRICAL AND OPTICAL PROPERTIES OF THIN FILM DIAMOND IMPLANTED WITH SILICON K. J. Roe and J and electrical properties of diamond make it an attractive material for use in extreme conditions. Diamond

  12. Field emission properties of phosphorus doped microwave plasma chemical vapor deposition diamond films by ion implantation

    E-Print Network [OSTI]

    Lee, Jong Duk

    2002; published 5 February 2003 Phosphorus doped polycrystalline diamond films were grown using ion the electrical char- acteristics of diamond FEAs to lower the operating voltage. Polycrystalline diamond hasField emission properties of phosphorus doped microwave plasma chemical vapor deposition diamond

  13. Boron Doping of Microcrystalline and Nanocrystalline Diamond Films: Where is the Boron Paul William May1

    E-Print Network [OSTI]

    Bristol, University of

    is that polycrystalline boron-doped CVD diamond films possess grain boundaries containing a small-volume fraction of non-diamondBoron Doping of Microcrystalline and Nanocrystalline Diamond Films: Where is the Boron Going? Paul `cauliflower'-type nanocrystalline (c-NCD) CVD diamond films vary as a function of B content. The conductivity

  14. Estimation of parameters in thermal-field emission from diamond D.G. Walkera

    E-Print Network [OSTI]

    Walker, D. Greg

    : Thermal field emission; Diamond film 1. Introduction Polycrystalline diamond films can exhibit outstanding polycrystalline diamond films at elevated temperatures. Thermal effects are included in the models and provide. Wang et al. [10] observed emission from the region between grains in polycrystalline diamond films

  15. Atomistic simulations of structures and mechanical properties of S011diamond

    E-Print Network [OSTI]

    Brenner, Donald W.

    Polycrystalline diamond films obtained by chemical vapor deposition CVD have numerous applications due and their triple junctions in diamond O. A. Shenderova and Donald W. Brenner Department of Materials Science triple junctions TJ's in diamond as well as a multiply twinned diamond particle have been calculated

  16. Notes 16. Analysis of tilting pad bearings

    E-Print Network [OSTI]

    San Andres, Luis

    2010-01-01T23:59:59.000Z

    NOTES 16. STATIC AND DYNAMIC FORCED PERFORMANCE OF TILTING PAD BEARINGS: ANALYSIS INCLUDING PIVOT STIFFNESS Dr. Luis San Andr?s Mast-Childs Professor August 2010 SUMMARY Work in progress ? still a lot of be done Introduction... Figure 1 shows a tilting pad journal bearing comprised of four pads. Each pad tilts about its pivot making a hydrodynamic film that generates a pressure reacting to the static load applied on the spinning journal. This type of bearing is typically...

  17. Black Diamond Power Co | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:EzfeedflagBiomass ConversionsSouthby 2022 | OpenEIBixby, Oklahoma: EnergyBlack Diamond Power

  18. Bruce Diamond | National Nuclear Security Administration

    National Nuclear Security Administration (NNSA)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA groupTuba City, Arizona,Site Operations GuideAlternate WatchBenefitsDiamond |

  19. Engineering Research and Development and Technology thrust area report FY92

    SciTech Connect (OSTI)

    Langland, R.T.; Minichino, C. [eds.

    1993-03-01T23:59:59.000Z

    The mission of the Engineering Research, Development, and Technology Program at Lawrence Livermore National Laboratory (LLNL) is to develop the technical staff and the technology needed to support current and future LLNL programs. To accomplish this mission, the Engineering Research, Development, and Technology Program has two important goals: (1) to identify key technologies and (2) to conduct high-quality work to enhance our capabilities in these key technologies. To help focus our efforts, we identify technology thrust areas and select technical leaders for each area. The thrust areas are integrated engineering activities and, rather than being based on individual disciplines, they are staffed by personnel from Electronics Engineering, Mechanical Engineering, and other LLNL organizations, as appropriate. The thrust area leaders are expected to establish strong links to LLNL program leaders and to industry; to use outside and inside experts to review the quality and direction of the work; to use university contacts to supplement and complement their efforts; and to be certain that we are not duplicating the work of others. This annual report, organized by thrust area, describes activities conducted within the Program for the fiscal year 1992. Its intent is to provide timely summaries of objectives, theories, methods, and results. The nine thrust areas for this fiscal year are: Computational Electronics and Electromagnetics; Computational Mechanics; Diagnostics and Microelectronics; Emerging Technologies; Fabrication Technology; Materials Science and Engineering; Microwave and Pulsed Power; Nondestructive Evaluation; and Remote Sensing and Imaging, and Signal Engineering.

  20. Gearbox Reliability Collaborative Bearing Calibration

    SciTech Connect (OSTI)

    van Dam, J.

    2011-10-01T23:59:59.000Z

    NREL has initiated the Gearbox Reliability Collaborative (GRC) to investigate the root cause of the low wind turbine gearbox reliability. The GRC follows a multi-pronged approach based on a collaborative of manufacturers, owners, researchers and consultants. The project combines analysis, field testing, dynamometer testing, condition monitoring, and the development and population of a gearbox failure database. At the core of the project are two 750kW gearboxes that have been redesigned and rebuilt so that they are representative of the multi-megawatt gearbox topology currently used in the industry. These gearboxes are heavily instrumented and are tested in the field and on the dynamometer. This report discusses the bearing calibrations of the gearboxes.

  1. Performance evaluation of bound diamond ring tools

    SciTech Connect (OSTI)

    Piscotty, M.A.; Taylor, J.S.; Blaedel, K.L.

    1995-07-14T23:59:59.000Z

    LLNL is collaborating with the Center for Optics Manufacturing (COM) and the American Precision Optics Manufacturers Association (APOMA) to optimize bound diamond ring tools for the spherical generation of high quality optical surfaces. An important element of this work is establishing an experimentally-verified link between tooling properties and workpiece quality indicators such as roughness, subsurface damage and removal rate. In this paper, we report on a standardized methodology for assessing ring tool performance and its preliminary application to a set of commercially-available wheels. Our goals are to (1) assist optics manufacturers (users of the ring tools) in evaluating tools and in assessing their applicability for a given operation, and (2) provide performance feedback to wheel manufacturers to help optimize tooling for the optics industry. Our paper includes measurements of wheel performance for three 2-4 micron diamond bronze-bond wheels that were supplied by different manufacturers to nominally- identical specifications. Preliminary data suggests that the difference in performance levels among the wheels were small.

  2. Implantation conditions for diamond nanocrystal formation in amorphous silica

    SciTech Connect (OSTI)

    Buljan, Maja; Radovic, Iva Bogdanovic; Desnica, Uros V.; Ivanda, Mile; Jaksic, Milko [Ruder Boskovic Institute, P.O. Box 180, 10002 Zagreb (Croatia); Saguy, Cecile; Kalish, Rafi [Physics Department and Solid State Institute, Technion, Haifa 32000 (Israel); Djerdj, Igor [Department of Materials, Swiss Federal Institute of Technology (ETH) Zuerich, Wolfgang-Pauli-Str. 10, CH-8093 Zuerich (Switzerland); Tonejc, Andelka [Faculty of Science, Department of Physics, University of Zagreb, 10000 Zagreb (Croatia); Gamulin, Ozren [School of Medicine, Zagreb University, 10000 Zagreb (Croatia)

    2008-08-01T23:59:59.000Z

    We present a study of carbon ion implantation in amorphous silica, which, followed by annealing in a hydrogen-rich environment, leads to preferential formation of carbon nanocrystals with cubic diamond (c-diamond), face-centered cubic (n-diamond), or simple cubic (i-carbon) carbon crystal lattices. Two different annealing treatments were used: furnace annealing for 1 h and rapid thermal annealing for a brief period, which enables monitoring of early nucleation events. The influence of implanted dose and annealing type on carbon and hydrogen concentrations, clustering, and bonding were investigated. Rutherford backscattering, elastic recoil detection analysis, infrared spectroscopy, transmission electron microscopy, selected area electron diffraction, ultraviolet-visible absorption measurements, and Raman spectroscopy were used to study these carbon formations. These results, combined with the results of previous investigations on similar systems, show that preferential formation of different carbon phases (diamond, n-diamond, or i-carbon) depends on implantation energy, implantation dose, and annealing conditions. Diamond nanocrystals formed at a relatively low carbon volume density are achieved by deeper implantation and/or lower implanted dose. Higher volume densities led to n-diamond and finally to i-carbon crystal formation. This observed behavior is related to damage sites induced by implantation. The optical properties of different carbon nanocrystal phases were significantly different.

  3. Self-adjusting magnetic bearing systems

    DOE Patents [OSTI]

    Post, R.F.

    1998-07-21T23:59:59.000Z

    A self-adjusting magnetic bearing automatically adjusts the parameters of an axially unstable magnetic bearing such that its force balance is maintained near the point of metastable equilibrium. Complete stabilization can be obtained with the application of weak restoring forces either from a mechanical bearing (running at near-zero load, thus with reduced wear) or from the action of residual eddy currents in a snubber bearing. In one embodiment, a torque is generated by the approach of a slotted pole to a conducting plate. The torque actuates an assembly which varies the position of a magnetic shunt to change the force exerted by the bearing. Another embodiment achieves axial stabilization by sensing vertical displacements in a suspended bearing element, and using this information in an electrical servo system. In a third embodiment, as a rotating eddy current exciter approaches a stationary bearing, it heats a thermostat which actuates an assembly to weaken the attractive force between the two bearing elements. An improved version of an electromechanical battery utilizing the designs of the various embodiments is described. 7 figs.

  4. Self-adjusting magnetic bearing systems

    DOE Patents [OSTI]

    Post, Richard F. (Walnut Creek, CA)

    1998-01-01T23:59:59.000Z

    A self-adjusting magnetic bearing automatically adjusts the parameters of an axially unstable magnetic bearing such that its force balance is maintained near the point of metastable equilibrium. Complete stabilization can be obtained with the application of weak restoring forces either from a mechanical bearing (running at near-zero load, thus with reduced wear) or from the action of residual eddy currents in a snubber bearing. In one embodiment, a torque is generated by the approach of a slotted pole to a conducting plate. The torque actuates an assembly which varies the position of a magnetic shunt to change the force exerted by the bearing. Another embodiment achieves axial stabilization by sensing vertical displacements in a suspended bearing element, and using this information in an electrical servo system. In a third embodiment, as a rotating eddy current exciter approaches a stationary bearing, it heats a thermostat which actuates an assembly to weaken the attractive force between the two bearing elements. An improved version of an electromechanical battery utilizing the designs of the various embodiments is described.

  5. Observation of diamond turned OFHC copper using Scanning Tunneling Microscopy

    SciTech Connect (OSTI)

    Grigg, D.A.; Russell, P.E.; Dow, T.A.

    1988-12-01T23:59:59.000Z

    Diamond turned OFHC copper samples have been observed within the past few months using the Scanning Tunneling Microscope. Initial results have shown evidence of artifacts which may be used to better understand the diamond turning process. The STM`s high resolution capability and three dimensional data representation allows observation and study of surface features unobtainable with conventional profilometry systems. Also, the STM offers a better quantitative means by which to analyze surface structures than the SEM. This paper discusses findings on several diamond turned OFHC copper samples having different cutting conditions. Each sample has been cross referenced using STM and SEM.

  6. Software optimization for electrical conductivity imaging in polycrystalline diamond cutters

    SciTech Connect (OSTI)

    Bogdanov, G.; Ludwig, R. [Department of Electrical and Computer Engineering, Worcester Polytechnic Institute, 100 Institute Rd, Worcester, MA 01609 (United States); Wiggins, J.; Bertagnolli, K. [US Synthetic, 1260 South 1600 West, Orem, UT 84058 (United States)

    2014-02-18T23:59:59.000Z

    We previously reported on an electrical conductivity imaging instrument developed for measurements on polycrystalline diamond cutters. These cylindrical cutters for oil and gas drilling feature a thick polycrystalline diamond layer on a tungsten carbide substrate. The instrument uses electrical impedance tomography to profile the conductivity in the diamond table. Conductivity images must be acquired quickly, on the order of 5 sec per cutter, to be useful in the manufacturing process. This paper reports on successful efforts to optimize the conductivity reconstruction routine, porting major portions of it to NVIDIA GPUs, including a custom CUDA kernel for Jacobian computation.

  7. Printable, flexible and stretchable diamond for thermal management

    DOE Patents [OSTI]

    Rogers, John A; Kim, Tae Ho; Choi, Won Mook; Kim, Dae Hyeong; Meitl, Matthew; Menard, Etienne; Carlisle, John

    2013-06-25T23:59:59.000Z

    Various heat-sinked components and methods of making heat-sinked components are disclosed where diamond in thermal contact with one or more heat-generating components are capable of dissipating heat, thereby providing thermally-regulated components. Thermally conductive diamond is provided in patterns capable of providing efficient and maximum heat transfer away from components that may be susceptible to damage by elevated temperatures. The devices and methods are used to cool flexible electronics, integrated circuits and other complex electronics that tend to generate significant heat. Also provided are methods of making printable diamond patterns that can be used in a range of devices and device components.

  8. Rotor and bearing system for a turbomachine

    DOE Patents [OSTI]

    Lubell, Daniel; Weissert, Dennis

    2006-09-26T23:59:59.000Z

    A rotor and bearing system for a turbomachine. The turbomachine includes a drive shaft, an impeller positioned on the drive shaft, and a turbine positioned on the drive shaft proximate to the impeller. The bearing system comprises one gas journal bearing supporting the drive shaft between the impeller and the turbine. The area between the impeller and the turbine is an area of increased heat along the drive shaft in comparison to other locations along the drive shaft. The section of the drive shaft positioned between impeller and the turbine is also a section of the drive shaft that experiences increased stressed and load in the turbomachine. The inventive bearing machine system positions only one radial bearing in this area of increased stress and load.

  9. Direct measurement of the impulse in a magnetic thrust chamber system for laser fusion rocket

    SciTech Connect (OSTI)

    Maeno, Akihiro; Yamamoto, Naoji; Nakashima, Hideki [Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6-1 Kasuga-kouen, Kasuga, Fukuoka 816-8580 (Japan); Fujioka, Shinsuke; Johzaki, Tomoyuki [Institute of Laser Engineering, Osaka University, Suita, Osaka 565-087 (Japan); Mori, Yoshitaka [Graduate School for the Creation of New Photonics Industries, Hamamatsu, Shizuoka 431-1202 (Japan); Sunahara, Atsushi [Institute for Laser Technology, Suita, Osaka 565-087 (Japan)

    2011-08-15T23:59:59.000Z

    An experiment is conducted to measure an impulse for demonstrating a magnetic thrust chamber system for laser fusion rocket. The impulse is produced by the interaction between plasma and magnetic field. In the experiment, the system consists of plasma and neodymium permanent magnets. The plasma is created by a single-beam laser aiming at a polystyrene spherical target. The impulse is 1.5 to 2.2 {mu}Ns by means of a pendulum thrust stand, when the laser energy is 0.7 J. Without magnetic field, the measured impulse is found to be zero. These results indicate that the system for generating impulse is working.

  10. From Ultrananocrystalline Diamond to Single Crystal Diamond Growth in Hot Filament and Microwave Plasma-Enhanced CVD Reactors: a Unified Model for Growth Rates and

    E-Print Network [OSTI]

    Bristol, University of

    From Ultrananocrystalline Diamond to Single Crystal Diamond Growth in Hot Filament and Microwave, Moscow State UniVersity, 119991 Moscow, Russia ReceiVed: April 29, 2008 CVD Diamond can now be deposited either in the form of single crystal homoepitaxial layers, or as polycrystalline films with crystal sizes

  11. Late Pleistocene to Holocene slip rates for the Gurvan Bulag thrust fault (Gobi-Altay, Mongolia) estimated with 10

    E-Print Network [OSTI]

    Déverchère, Jacques

    Late Pleistocene to Holocene slip rates for the Gurvan Bulag thrust fault (Gobi-Altay, Mongolia neotectonics; KEYWORDS: Late Pleistocene, Holocene, thrust fault, slip rate, 10Be dating, Mongolia Citation-Altay, Mongolia) estimated with 10 Be dates, J. Geophys. Res., 108(B3), 2162, doi:10.1029/2001JB000553, 2003. 1

  12. Tuning the Passive Structural Response of an Oscillating-foil Propulsion Mechanism for Improved Thrust Generation and Efficiency

    E-Print Network [OSTI]

    Victoria, University of

    Thrust Generation and Efficiency by Andrew James Richards B.A.Sc., The University of British Columbia of an Oscillating-foil Propulsion Mechanism for Improved Thrust Generation and Efficiency by Andrew James Richards B for the use of flexible oscillating foils which, under suitable conditions, have been demon- strated

  13. Coordinating diamond interchange and arterial street signal control

    E-Print Network [OSTI]

    Engelbrecht, Roelof Johannes

    1997-01-01T23:59:59.000Z

    that under some conditions, notably particular cycle lengths, the coordination of diamond interchange and arterial signal control could be beneficial. This will be the case when the optimal cycle lengths of the arterial and interchange systems are similar...

  14. Plasma-assisted conversion of solid hydrocarbon to diamond

    DOE Patents [OSTI]

    Valone, Steven M. (Santa Fe, NM); Pattillo, Stevan G. (Los Alamos, NM); Trkula, Mitchell (Los Alamos, NM); Coates, Don M. (Santa Fe, NM); Shah, S. Ismat (Wilmington, DE)

    1996-01-01T23:59:59.000Z

    A process of preparing diamond, e.g., diamond fiber, by subjecting a hydrocarbon material, e.g., a hydrocarbon fiber, to a plasma treatment in a gaseous feedstream for a sufficient period of time to form diamond, e.g., a diamond fiber is disclosed. The method generally further involves pretreating the hydrocarbon material prior to treatment with the plasma by heating within an oxygen-containing atmosphere at temperatures sufficient to increase crosslinking within said hydrocarbon material, but at temperatures insufficient to melt or decompose said hydrocarbon material, followed by heating at temperatures sufficient to promote outgassing of said crosslinked hydrocarbon material, but at temperatures insufficient to convert said hydrocarbon material to carbon.

  15. Diamonds are an Electronic Device’s Best Friend

    Broader source: Energy.gov [DOE]

    Researchers at Argonne National Lab recently devised a way to use diamonds to brighten the performance of electronic devices, which could put a bit more sparkle in everyone’s day.

  16. Slip sliding away: Graphene and diamonds prove a slippery combination...

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

    Slip sliding away: Graphene and diamonds prove a slippery combination By Jared Sagoff * May 22, 2015 Tweet EmailPrint Scientists at the U.S. Department of Energy's Argonne National...

  17. Electrochemical hydrogen termination of boron-doped diamond

    SciTech Connect (OSTI)

    Hoffmann, Rene; Kriele, Armin; Obloh, Harald; Hees, Jakob; Wolfer, Marco; Smirnov, Waldemar; Yang Nianjun; Nebel, Christoph E. [Fraunhofer Institute for Applied Solid State Physics (IAF), Tullastrasse 72, Freiburg 79108 (Germany)

    2010-08-02T23:59:59.000Z

    Boron-doped diamond is a promising transducer material for numerous devices which are designed for contact with electrolytes. For optimized electron transfer the surface of diamond needs to be hydrogen terminated. Up to now H-termination of diamond is done by plasma chemical vapor deposition techniques. In this paper, we show that boron-doped diamond can be H-terminated electrochemically by applying negative voltages in acidic solutions. Electrochemical H-termination generates a clean surface with virtually no carbon-oxygen bonds (x-ray photoelectron spectroscopy), a reduced electron affinity (scanning electron microscopy), a highly hydrophobic surface (water contact angle), and a fast electron exchange with Fe(CN){sub 6}{sup -3/-4} (cyclic voltammetry).

  18. Spin properties of very shallow nitrogen vacancy defects in diamond

    E-Print Network [OSTI]

    Ofori-Okai, Benjamin Kwasi

    We investigate spin and optical properties of individual nitrogen vacancy centers located within 1–10 nm from the diamond surface. We observe stable defects with a characteristic optically detected magnetic-resonance ...

  19. Robust Decoupling Techniques to Extend Quantum Coherence in Diamond

    E-Print Network [OSTI]

    Ryan, Colm A.

    We experimentally demonstrate over 2 orders of magnitude increase in the room-temperature coherence time of nitrogen-vacancy centers in diamond by implementing decoupling techniques. We show that equal pulse spacing ...

  20. World-leading lab opens new frontiers in diamond

    E-Print Network [OSTI]

    Machel, Hans

    and positioning Canada to be on the cutting edge of innovation." Pearson, a professor of geochemistry, came Pearson, also noting the support of colleagues-- leaders in diamond-related research who were a key factor

  1. Large piezoresistive effect in surface conductive nanocrystalline diamond

    SciTech Connect (OSTI)

    Janssens, S. D., E-mail: stoffel.d.janssens@gmail.com; Haenen, K., E-mail: ken.haenen@uhasselt.be [Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1, B-3590 Diepenbeek (Belgium); IMOMEC, IMEC vzw, Wetenschapspark 1, B-3590 Diepenbeek (Belgium); Drijkoningen, S. [Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1, B-3590 Diepenbeek (Belgium)

    2014-09-08T23:59:59.000Z

    Surface conductivity in hydrogen-terminated single crystal diamond is an intriguing phenomenon for fundamental reasons as well as for application driven research. Surface conductivity is also observed in hydrogen-terminated nanocrystalline diamond although the electronic transport mechanisms remain unclear. In this work, the piezoresistive properties of intrinsic surface conductive nanocrystalline diamond are investigated. A gauge factor of 35 is calculated from bulging a diamond membrane of 350?nm thick, with a diameter of 656??m and a sheet resistance of 1.45 M?/sq. The large piezoresistive effect is reasoned to originate directly from strain-induced changes in the resistivity of the grain boundaries. Additionally, we ascribe a small time-dependent fraction of the piezoresistive effect to charge trapping of charge carriers at grain boundaries. In conclusion, time-dependent piezoresistive effect measurements act as a tool for deeper understanding the complex electronic transport mechanisms induced by grain boundaries in a polycrystalline material or nanocomposite.

  2. Analytical and experimental investigations of hybrid air foil bearings

    E-Print Network [OSTI]

    Kumar, Manish

    2009-05-15T23:59:59.000Z

    rotary flow compressor, micro-turbines [2] and oil-free turbochargers [3]. Air Foil bearings, however, have reliability issues that stem from the wear caused by dry rubbing during startups and stops. These bearings also have limited heat dissipation... of Hybrid Airfoil Bearing? by Kumar, M., and Kim, D., 2008. Journal of Engineering for Gas Turbines and Power, 130, Copyright 2008 by ASME. 10 Table 1: Bearing parameters ? Simulation Parameters Value Bearing diameter, 2R 38.1 mm Bearing axial...

  3. Electrodeposited coatings for diamond turning applications

    SciTech Connect (OSTI)

    Mayer, A.; Bramlett, R.D.; Day, R.D. (Los Alamos National Lab., NM (USA)); Evans, C.J.; Polvani, R.S. (National Inst. of Standards and Technology, Gaithersburg, MD (USA))

    1991-01-01T23:59:59.000Z

    Electrodeposited coatings are attractive for precision machining operations because thick coatings can be economically applied, with good adhesion, to a variety of substrates. Approximately 20 pure metals and a large number of alloys can be deposited from aqueous solutions. Fused salt and organic solvent electrolytes can be used to lengthen the list of metals that can be electrodeposited. However, both the choice of the metallic coating and the control of the plating process are critical for success in precision finishing of electrodeposited coatings. Some preliminary results at the National Institute of Standards and Technology and at the Lawrence Livermore National Laboratory suggest that electrodeposited nickel-phosphorus alloys are excellent coatings for single point diamond turning from the standpoint of material properties and low tool wear. Electrodeposited aluminum and aluminum alloy coatings also merit consideration for precision finishing where weight is an important factor. 10 refs., 6 figs.

  4. The influence of surface preparation on the electrochemistry of boron doped diamond: A study of the reduction of

    E-Print Network [OSTI]

    Bristol, University of

    ; Surface modification 1. Introduction Electrodes based on polycrystalline diamond are presently generating significant interest. Polycrystalline diamond possesses physical properties that suggest that electrodesThe influence of surface preparation on the electrochemistry of boron doped diamond: A study

  5. Fluorinated diamond particles bonded in a filled fluorocarbon resin matrix

    DOE Patents [OSTI]

    Taylor, G.W.; Roybal, H.E.

    1983-11-14T23:59:59.000Z

    A method of producing fluorinated diamond particles bonded in a filled fluorocarbon resin matrix. Simple hot pressing techniques permit the formation of such matrices from which diamond impregnated grinding tools and other articles of manufacture can be produced. Teflon fluorocarbon resins filled with Al/sub 2/O/sub 3/ yield grinding tools with substantially improved work-to-wear ratios over grinding wheels known in the art.

  6. Fluorinated diamond particles bonded in a filled fluorocarbon resin matrix

    DOE Patents [OSTI]

    Taylor, Gene W. (Los Alamos, NM); Roybal, Herman E. (Santa Fe, NM)

    1985-01-01T23:59:59.000Z

    A method of producing fluorinated diamond particles bonded in a filled fluorocarbon resin matrix. Simple hot pressing techniques permit the formation of such matrices from which diamond impregnated grinding tools and other articles of manufacture can be produced. Teflon fluorocarbon resins filled with Al.sub.2 O.sub.3 yield grinding tools with substantially improved work-to-wear ratios over grinding wheels known in the art.

  7. Method for the preparation of nanocrystalline diamond thin films

    DOE Patents [OSTI]

    Gruen, D.M.; Krauss, A.R.

    1998-06-30T23:59:59.000Z

    A method and system are disclosed for manufacturing nanocrystalline diamond film on a substrate such as field emission tips. The method involves forming a carbonaceous vapor, providing a gas stream of argon, hydrocarbon and possibly hydrogen, and combining the gas with the carbonaceous vapor, passing the combined carbonaceous vapor and gas carrier stream into a chamber, forming a plasma in the chamber causing fragmentation of the carbonaceous vapor and deposition of a diamond film on the field emission tip. 40 figs.

  8. Effectiveness of guidelines for retiming signalized diamond interchanges

    E-Print Network [OSTI]

    Irvine, Yvonne Denise

    1991-01-01T23:59:59.000Z

    powerful for studying the effect the use of diamond interchange guidelines had on test scores (17). For this experiment, a 95% confidence level was used to control a Type I error. The covariable is also referred to as the concomitant variable (+I...: Dr. Daniel B. Fambro This thesis documents the results of testing the effectiveness of guidelines for retiming signalized diamond interchanges. Two problems were addressed: how to measure benefits gained by use of the guidelines and, how to locate...

  9. Yield Optimization of Nitrogen Vacancy Centers in Diamond 

    E-Print Network [OSTI]

    Chen, Jeson

    2012-10-19T23:59:59.000Z

    /nmg2870 ………………………………………………………………. 21 3-7 The minimum implantation time to prevent graphitization versus temperature for various doses of 2 MeV nitrogen implantation………… 22 x FIGURE... is feasible and allows removal of most dirt, some amorphous carbon, and graphite on surface without eroding the diamond. The bond strength of diamond also allows heating in vacuum to high temperature up to 1700°C and can be baked in air up to 700°C...

  10. Analysis of the influence of tool dynamics in diamond turning

    SciTech Connect (OSTI)

    Fawcett, S.C.; Luttrell, D.E.; Keltie, R.F.

    1988-12-01T23:59:59.000Z

    This report describes the progress in defining the role of machine and interface dynamics on the surface finish in diamond turning. It contains a review of literature from conventional and diamond machining processes relating tool dynamics, material interactions and tool wear to surface finish. Data from experimental measurements of tool/work piece interface dynamics are presented as well as machine dynamics for the DTM at the Center.

  11. Bear Head LNG Corporation and Bear Head LNG (USA), LLC FE Docket No. 15-14-NG

    Broader source: Energy.gov [DOE]

    On January 23, 2015, Bear Head LNG Corporation and Bear Head LNG (USA), LLC (together, “Bear Head LNG”), filed an application for long-term, multi-contract authorization to engage in imports from,...

  12. Bear Head LNG Corporation and Bear Head LNG (USA), LLC- FE Dkt No. 15-14-NG

    Broader source: Energy.gov [DOE]

    On January 23, 2015, Bear Head LNG Corporation and Bear Head LNG (USA), LLC (together, “Bear Head LNG”), filed an application for long-term, multi-contract authorization to engage in imports from,...

  13. Structure and evolution of the active fold and thrust belt of southwestern Taiwan using GPS geodesy

    E-Print Network [OSTI]

    Hickman, John Bibb

    1999-01-01T23:59:59.000Z

    ) from north to south, a dramatic change in the width of the deformation front of the fold and thrust belt which is accentuated across the Michih fault, and 4) the Tulungwan fault, a bounding fault between the Western Foothills and the Slate Belt, appears...

  14. Thrust Area 2 Free-Piston Compressor for Portable Fluid-Powered Systems

    E-Print Network [OSTI]

    Barth, Eric J.

    Thrust Area 2 Free-Piston Compressor for Portable Fluid-Powered Systems Dr. Eric J. Barth José A Diluted combustion products from previous stroke Combustion gases expand down to Air in compressor chamber begins to pressurize. Combustion products cooled Compressor side pumps to reservoir. Magnet locks free

  15. A Thrust Stand for High-power Steady-state Plasma Thrusters L.D. Cassady,

    E-Print Network [OSTI]

    Choueiri, Edgar

    Accelerator with lithium vapor propellant operating at 500 A, 9.5 mg/s lithium flow rate and a 0.07 T applied-pendulum thrust stand described here is used as an integral part of our lithium Lorentz Force Accelerator (LiLFA) research program. The demonstration of 50% efficiency at 0.5 MW with 500 hours of nearly erosion

  16. Modeling the Characteristics of Propulsion Systems Providing Less Than 10 N Thrust

    E-Print Network [OSTI]

    . Chiasson, Paulo C. Lozano May 2012 SSL#8-12 1 #12;2 #12;Modeling the Characteristics of Propulsion Systems Providing Less Than 10 N Thrust Thomas M. Chiasson, Paulo C. Lozano May 2012 SSL#8-12 1 1 This work is based

  17. Predicting stress distributions in fold-and-thrust belts and accretionary wedges by optimization

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    element method (EEM) provides the stress distribution in geometrical models of folds, relevant to fold for discontinuities. The example chosen to illustrate the potential of the EEM and to validate our implementation is the thrusting of a rectangular sheet over a flat and weak de´collement. The EEM reproduces the solution proposed

  18. Seismological evidence for crustal-scale thrusting in the Zagros mountain belt (Iran)

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Seismological evidence for crustal-scale thrusting in the Zagros mountain belt (Iran) Anne Paul 1 Grenoble Cedex, France 2 International Institute of Earthquake Engineering and Seismology, Tehran, Iran 3 that the crust of Zagros underthrusts the crust of central Iran along the MZT considered as a crustal

  19. CFD Simulation of Dynamic Thrust and Radial Forces on a Vertical Axis Wind Turbine Blade

    E-Print Network [OSTI]

    Tullis, Stephen

    CFD Simulation of Dynamic Thrust and Radial Forces on a Vertical Axis Wind Turbine Blade K. Mc vibration source of a small scale vertical axis wind turbine. The dynamic loading on the blades of the turbine, as they rotate about the central shaft and travel through a range of relative angles of attack

  20. Convergence rate across the Nepal Himalaya and interseismic coupling on the Main Himalayan Thrust: Implications

    E-Print Network [OSTI]

    Avouac, Jean-Philippe

    Convergence rate across the Nepal Himalaya and interseismic coupling on the Main Himalayan Thrust the Nepal Himalaya using GPS times series from 30 stations in Nepal and southern Tibet, in addition and eastern Nepal and 20.5 Æ 1 mm/yr in western Nepal. The moment deficit due to locking of the MHT

  1. Compressor ported shroud for foil bearing cooling

    DOE Patents [OSTI]

    Elpern, David G. (Los Angeles, CA); McCabe, Niall (Torrance, CA); Gee, Mark (South Pasadena, CA)

    2011-08-02T23:59:59.000Z

    A compressor ported shroud takes compressed air from the shroud of the compressor before it is completely compressed and delivers it to foil bearings. The compressed air has a lower pressure and temperature than compressed outlet air. The lower temperature of the air means that less air needs to be bled off from the compressor to cool the foil bearings. This increases the overall system efficiency due to the reduced mass flow requirements of the lower temperature air. By taking the air at a lower pressure, less work is lost compressing the bearing cooling air.

  2. Diagnostic of fusion neutrons on JET tokamak using diamond detector

    SciTech Connect (OSTI)

    Nemtsev, G.; Amosov, V.; Marchenko, N.; Meshchaninov, S.; Rodionov, R. [Institution Project center ITER, Moscow (Russian Federation); Popovichev, S. [EURATOM-CCFE Fusion Association, Culham Science Centre, Abingdon, OXON, OX14 3DB (United Kingdom); Collaboration: JET EFDA Conbributors

    2014-08-21T23:59:59.000Z

    In 2011-2012, an experimental campaign with a significant yield of fusion neutrons was carried out on the JET tokamak. During this campaign the facility was equipped with two diamond detectors based on natural and artificial CVD diamond. These detectors were designed and manufactured in State Research Center of Russian Federation TRINITI. The detectors measure the flux of fast neutrons with energies above 0.2 MeV. They have been installed in the torus hall and the distance from the center of plasma was about 3 m. For some of the JET pulses in this experiment, the neutron flux density corresponded to the operational conditions in collimator channels of ITER Vertical Neutron Camera. The main objective of diamond monitors was the measurement of total fast neutron flux at the detector location and the estimation of the JET total neutron yield. The detectors operate as threshold counters. Additionally a spectrometric measurement channel has been configured that allowed us to distinguish various energy components of the neutron spectrum. In this paper we describe the neutron signal measuring and calibration procedure of the diamond detector. Fluxes of DD and DT neutrons at the detector location were measured. It is shown that the signals of total neutron yield measured by the diamond detector correlate with signals measured by the main JET neutron diagnostic based on fission chambers with high accuracy. This experiment can be considered as a successful test of diamond detectors in ITER-like conditions.

  3. The Main Mantle Thrust (MMT) is the regional contact between collider India and the overthrust Kohistan-Ladakh series in the Pakistan Himalaya. Early Himalayan-age

    E-Print Network [OSTI]

    Kidd, William S. F.

    and the overthrust Kohistan-Ladakh series in the Pakistan Himalaya. Early Himalayan-age thrusting and some later (~20

  4. A carbon nanotube bearing and Stodola rotor

    E-Print Network [OSTI]

    Cook, Eugene Hightower

    2008-01-01T23:59:59.000Z

    A nano-scale rotor supported on a cantilevered multi-wall carbon nanotube (MWNT) shaft (Stodola configuration) is proposed. The nanotube is also expected to function as the bearing, since individual walls of a MWNT are not ...

  5. Carbon nanotube bearings in theory and practice

    E-Print Network [OSTI]

    Cook, Eugene Hightower

    2011-01-01T23:59:59.000Z

    Carbon Nanotubes (CNTs) are attractive elements for bearings in Micro-Electro-Mechanical Systems (MEMS), because their structure comprises nested shells with no bonding and sub-nanometer spacing between them, enabling ...

  6. Flywheel energy storage with superconductor magnetic bearings

    DOE Patents [OSTI]

    Weinberger, Bernard R. (Avon, CT); Lynds, Jr., Lahmer (Glastonbury, CT); Hull, John R. (Hinsdale, IL)

    1993-01-01T23:59:59.000Z

    A flywheel having superconductor bearings has a lower drag to lift ratio that translates to an improvement of a factor of ten in the rotational decay rate. The lower drag results from the lower dissipation of melt-processed YBCO, improved uniformity of the permanent magnet portion of the bearings, operation in a different range of vacuum pressure from that taught by the art, and greater separation distance from the rotating members of conductive materials.

  7. Evaluation of TexSIM for modeling traffic behavior at diamond interchanges

    E-Print Network [OSTI]

    Meadors, Allison Christine Cherry

    1995-01-01T23:59:59.000Z

    traffic behavior at signalized diamond interchanges. To evaluate TexSIM 2.0 for simulating and providing accurate descriptive measures of performance for pretimed and actuated diamond interchanges, model outputs were compared to field data collected from...

  8. Amorphous boron gasket in diamond anvil cell research Jung-Fu Lin,a)

    E-Print Network [OSTI]

    Lin, Jung-Fu "Afu"

    -pressure diamond anvil cell experiments. We have applied the boron gasket for laser-heating x-ray diffraction in the drilling process can cause can- cer. Diamond, the hardest material known, has also been used as a gasket

  9. Dynamic compression of synthetic diamond windows (final report for LDRD project 93531).

    SciTech Connect (OSTI)

    Dolan, Daniel H.,

    2008-09-01T23:59:59.000Z

    Diamond is an attractive dynamic compression window for many reasons: high elastic limit,large mechanical impedance, and broad transparency range. Natural diamonds, however, aretoo expensive to be used in destructive experiments. Chemical vapor deposition techniquesare now able to produce large single-crystal windows, opening up many potential dynamiccompression applications. This project studied the behavior of synthetic diamond undershock wave compression. The results suggest that synthetic diamond could be a usefulwindow in this field, though complete characterization proved elusive.3

  10. Progress in the Advanced Synthetic-Diamond Drill Bit Program

    SciTech Connect (OSTI)

    Glowka, D.A. [Sandia National Labs., Albuquerque, NM (United States); Dennis, T. [Dennis Tool Co., Houston, TX (United States); Le, Phi [Security DBS, Houston, TX (United States); Cohen, J. [Maurer Engineering, Inc., Houston, TX (United States); Chow, J. [Hughes Christensen Co., Salt Lake City, UT (United States)

    1995-11-01T23:59:59.000Z

    Cooperative research is currently underway among five drill bit companies and Sandia National Laboratories to improve synthetic-diamond drill bits for hard-rock applications. This work, sponsored by the US Department of Energy and individual bit companies, is aimed at improving performance and bit life in harder rock than has previously been possible to drill effectively with synthetic-diamond drill bits. The goal is to extend to harder rocks the economic advantages seen in using synthetic-diamond drill bits in soft and medium rock formations. Four projects are being conducted under this research program. Each project is investigating a different area of synthetic diamond bit technology that builds on the current technology base and market interests of the individual companies involved. These projects include: optimization of the PDC claw cutter; optimization of the Track-Set PDC bit; advanced TSP bit development; and optimization of impregnated-diamond drill bits. This paper describes the progress made in each of these projects to date.

  11. The 'Crazy Diamond' (and other blazars)

    SciTech Connect (OSTI)

    Vercellone, S. [INAF/IASF Milano, Via Bassini 15, 20133 Milano (Italy); INAF/IASF Palermo, Via Ugo La Malfa 153, 90146 Palermo (Italy); Donnarumma, I.; Pacciani, L.; Pucella, G.; Vittorini, V. [INAF/IASF Roma, Via Fosso del Cavaliere 100, 00133 Roma (Italy); Bulgarelli, A. [INAF/IASF Bologna, Via Gobetti 101, 40129 Bologna (Italy); Chen, A. W. [CIFS-Torino, Viale Settimio Severo 3, 10133 Torino (Italy); INAF/IASF Milano, Via Bassini 15, 20133 Milano (Italy); D'Ammando, F.; Tavani, M. [INAF/IASF Roma, Via Fosso del Cavaliere 100, 00133 Roma (Italy); Dip. di Fisica, Univ. 'Tor Vergata', Via della Ricerca Scientifica 1, 00133 Roma (Italy); Giuliani, A. [INAF/IASF Milano, Via Bassini 15, 20133 Milano (Italy); Longo, F. [Dip. di Fisica and INFN, Via Valerio 2, 34127 Trieste (Italy)

    2009-04-08T23:59:59.000Z

    During the first year of observations, AGILE detected several blazars at high significance: 3 C 279, 3C 454.3, PKS 1510-089, S5 0716+714, 3 C 273, MKN 421, and W Comae. We obtained long-term coverage of the Crazy Diamond 3 C 454.3, for more than 100 days at energies above 100 MeV. 3 C 273 was the first blazar detected simultaneously by the AGILE gamma-ray imaging detector and by its hard X-ray monitor. S5 0716+714, an intermediate BL Lac object, exhibited a very fast and intense gamma-ray transient event during an optical high-state phase, while MKN 421 and W Comae where detected during an AGILE target of opportunity (ToO) repointing. Thanks to the rapid dissemination of our alerts, we were able to obtain multi-wavelength ToO data from other observatories such as Spitzer, Swift, INTEGRAL, RXTE, Suzaku, MAGIC, VERITAS, as well as optical coverage by means of the WEBT Consortium and REM.

  12. Method for changing removable bearing for a wind turbine generator

    DOE Patents [OSTI]

    Bagepalli, Bharat Sampathkumaran (Niskayuna, NY); Jansen, Patrick Lee (Scotia, NY); Gadre, Aniruddha Dattatraya (Rexford, NY)

    2008-04-22T23:59:59.000Z

    A wind generator having removable change-out bearings includes a rotor and a stator, locking bolts configured to lock the rotor and stator, a removable bearing sub-assembly having at least one shrunk-on bearing installed, and removable mounting bolts configured to engage the bearing sub-assembly and to allow the removable bearing sub-assembly to be removed when the removable mounting bolts are removed.

  13. Removable bearing arrangement for a wind turbine generator

    DOE Patents [OSTI]

    Bagepalli, Bharat Sampathkumaran; Jansen, Patrick Lee; Gadre, Aniruddha Dattatraya

    2010-06-15T23:59:59.000Z

    A wind generator having removable change-out bearings includes a rotor and a stator, locking bolts configured to lock the rotor and stator, a removable bearing sub-assembly having at least one shrunk-on bearing installed, and removable mounting bolts configured to engage the bearing sub-assembly and to allow the removable bearing sub-assembly to be removed when the removable mounting bolts are removed.

  14. Stress state of diamond and gold under nonhydrostatic compression Jianghua Wang,1

    E-Print Network [OSTI]

    Duffy, Thomas S.

    for the polycrystalline gold under the highest load. Polycrystalline diamond can support a microscopic deviatoric stress of polycrystalline diamond and gold in the DAC under nonhydrostatic compression to above 300 GPa. The influenceStress state of diamond and gold under nonhydrostatic compression to 360 GPa Jianghua Wang,1

  15. Effects of phosphorus implantation and subsequent growth on diamond Euo Sik Choa,*, Cheon An Leea

    E-Print Network [OSTI]

    Lee, Jong Duk

    ]. Espe- cially, polycrystalline diamond films grown by microwave plasma chemical vapor deposition (MPCVD, and their fabrication is easy and economical. Polycrystalline diamond film has a rough surface and a lot of defectsEffects of phosphorus implantation and subsequent growth on diamond Euo Sik Choa,*, Cheon An Leea

  16. Thermal conductivity of nitrogenated ultrananocrystalline diamond films M. Shamsa,1,a

    E-Print Network [OSTI]

    , polycrystalline diamond PCD , diamondlike carbon DLC , carbon nanotubes, and single-layer graphene, have recentlyThermal conductivity of nitrogenated ultrananocrystalline diamond films on silicon M. Shamsa,1,a S of nitrogenated ultrananocrystalline diamond UNCD films on silicon. For better accuracy, the thermal conductivity

  17. Grafting odorant binding proteins on diamond bio-MEMS R. Manai a,

    E-Print Network [OSTI]

    Boyer, Edmond

    . Beside, cantilevers based on polycrystalline diamond surfaces are very promising as chemical transducers. Here two methods were investigated for chemically grafting porcine OBPs onto polycrystalline diamond1 Grafting odorant binding proteins on diamond bio-MEMS R. Manai a, *, E. Scorsone a , L. Rousseau

  18. A Study of the Grain Boundaries and Hydrogen in HF-CVD Diamond Films

    E-Print Network [OSTI]

    Adler, Joan

    composition of grain boundaries in polycrystalline diamond lms by transmission electron microscopy and highA Study of the Grain Boundaries and Hydrogen in HF-CVD Diamond Films Israel Yoel Koenka #12;A Study of the Grain Boundaries and Hydrogen in HF-CVD Diamond Films Research Thesis In partial fulllment

  19. Raman spectroscopy study of the influence of processing conditions on the structure of polycrystalline diamond films

    E-Print Network [OSTI]

    Boolchand, Punit

    of polycrystalline diamond films R. Ramamurti, V. Shanov, and R. N. Singha Department of Chemical and Materials is obvious, especially when polycrystalline diamond PCD is considered for optical and electronic applications-0030 Received 17 May 2005; accepted 14 November 2005; published 8 February 2006 Diamond films are prepared

  20. Simulations of polycrystalline CVD diamond film growth using a simplified Monte Carlo model

    E-Print Network [OSTI]

    Bristol, University of

    Simulations of polycrystalline CVD diamond film growth using a simplified Monte Carlo model P online 6 November 2009 Keywords: CVD diamond growth Modelling Nucleation Nanodiamond A simple 1) of a diamond (100) surface. The model considers adsorption, etching/desorption, lattice incorporation

  1. Electrochemical studies of moderately boron doped polycrystalline diamond in non-aqueous solvent

    E-Print Network [OSTI]

    Bristol, University of

    Electrochemical studies of moderately boron doped polycrystalline diamond in non-aqueous solvent being marketed [83,84]. The first paper on the electrochemistry of boron doped polycrystalline diamond The electrochemistry of boron doped diamond is currently an active field of research. In the majority of studies

  2. Moleculardynamics simulation of thermal stress at the (100) diamond/substrate interface: effect of film continuity

    E-Print Network [OSTI]

    Adler, Joan

    with the development of advanced CVD techniques 2 producing polycrystalline diamond of quality approachingMolecular­dynamics simulation of thermal stress at the (100) diamond/substrate interface: effect at the (100) diamond/substrate interface. The stress­induced binding energy reduction obtained

  3. Transitions in morphology observed in nitrogenmethanehydrogen depositions of polycrystalline diamond films

    E-Print Network [OSTI]

    Ayres, Virginia

    % and 1% methane­hydrogen depositions of polycrystalline diamond films. Five results are reported. 1.1063/1.1362406 I. INTRODUCTION Controlled, textured growth of polycrystalline diamond films would be desirable of polycrystalline diamond films: 2% CH4 /H2 and 1% CH4 /H2 . Five results are reported and discussed. II

  4. Charge Collection in the MERIT Diamond Detectors Kirk T. McDonald

    E-Print Network [OSTI]

    McDonald, Kirk

    , Princeton University, Princeton, NJ 08544 (February 18, 2010) The polycrystalline diamond detectors usedCharge Collection in the MERIT Diamond Detectors Kirk T. McDonald Joseph Henry Laboratories detectors used a bias field of 1 V/m, i.e., 500 V.1 The capacitance of the diamond detector itself was about

  5. Studies of n-type doping and surface modification of CVD diamond for use

    E-Print Network [OSTI]

    Bristol, University of

    strategy in chemical vapour deposition (CVD) of polycrystalline diamond films. Lithium nitride (Li3NStudies of n-type doping and surface modification of CVD diamond for use in thermionic applications-type dopants in diamond, the work has examined the use of Li-N codoping as a possible alternative doping

  6. Microcrystalline diamond micromechanical resonators with quality factor limited by thermoelastic damping

    E-Print Network [OSTI]

    Lin, Liwei

    using polycrystalline films. However, polycrystalline diamond films may not retain the desirable, while j approaching 2000 W mÀ1 KÀ1 has been demonstrated in thick (250­500 lm) polycrystalline diamondMicrocrystalline diamond micromechanical resonators with quality factor limited by thermoelastic

  7. Spatially-Correlated Microstructure and Superconductivity in Polycrystalline Boron-Doped Diamond

    E-Print Network [OSTI]

    Spatially-Correlated Microstructure and Superconductivity in Polycrystalline Boron-Doped Diamond F tunneling spectroscopies are performed below 100 mK on nano-crystalline boron-doped diamond films been discovered in heavily doped group IV covalent semicon- ductors [1], in particular diamond [2

  8. The Influence of Doping Levels and Surface Termination on the Electrochemistry of Polycrystalline Diamond

    E-Print Network [OSTI]

    Bristol, University of

    of Polycrystalline Diamond Matthew N. Latto, Gustavo Pastor-Moreno, D. Jason Riley* School of Chemistry, University on the redox chemistry of Fe(CN)3À=4À 6 at CVD polycrystalline diamond electrodes is considered diamond metallic electrochemical behavior is always observed, even at boron doping densities as low as 7 Â

  9. Elastic properties of transparent nano-polycrystalline diamond measured by GHz-ultrasonic interferometry and resonant

    E-Print Network [OSTI]

    Jacobsen, Steven D.

    Elastic properties of transparent nano-polycrystalline diamond measured by GHz-ultrasonic interferometry Sphere resonance Nano-polycrystalline diamond NPD Elastic properties Superhard materials a b s t r a c t The sound velocities and elastic moduli of transparent nano-polycrystalline diamond (NPD) have

  10. Atomistic simulations of structures and mechanical properties of polycrystalline diamond: Symmetrical S001< tilt grain boundaries

    E-Print Network [OSTI]

    Brenner, Donald W.

    Atomistic simulations of structures and mechanical properties of polycrystalline diamond for diamond to deposit as a polycrystalline film with a high density of grain boundaries and related defects structures and energies of symmetrical 001 tilt grain boundaries GB's in diamond have been calculated over

  11. Alumina atomic layer deposition nanocoatings on primary diamond particles using a fluidized bed reactor

    E-Print Network [OSTI]

    George, Steven M.

    /high-temperature (HP/HT) synthesis methods [4­7] led to the discovery of polycrystalline diamond grit and the manufacture of polycrystalline diamond compact (PDC) materials [8]. PDC cutters are well known and widely usedAlumina atomic layer deposition nanocoatings on primary diamond particles using a fluidized bed

  12. Direct engraving of quantum point contacts in heterostructures with a diamond tip

    E-Print Network [OSTI]

    Hohls, Frank

    of polycrystalline diamond onto a pre-patterned silicon substrate [7]. The results of the engraving procedure usingDirect engraving of quantum point contacts in heterostructures with a diamond tip J. Regul, U. F-Universit¨at Bochum, 44780 Bochum, Germany Abstract. We use the all-diamond tip of an atomic force microscope

  13. Fabrication of adherent porous diamond films on sintered WC-13 wt.%Co

    E-Print Network [OSTI]

    Bristol, University of

    and lower threshold voltages for field emission [10]. Conductive polycrystalline diamond films are alsoFabrication of adherent porous diamond films on sintered WC-13 wt.%Co substrates by bias enhanced 2011, accepted 3 May 2011 Published online 10 August 2011 Keywords diamond films, HFCVD, porous, WC

  14. Electrical and optical properties of diamond-like carbon films deposited by pulsed laser ablation

    E-Print Network [OSTI]

    Bristol, University of

    films, which make them more useful than polycrystalline diamond films for many applications. For exampleElectrical and optical properties of diamond-like carbon films deposited by pulsed laser ablation K e i n f o Available online 11 March 2010 Keyword: Pulsed laser ablation Diamond-like carbon films

  15. Spatially-correlated microstructure and superconductivity in polycrystalline Boron-doped diamond

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Spatially-correlated microstructure and superconductivity in polycrystalline Boron-doped diamond F are performed below 100 mK on polycrystalline Boron-doped diamond films characterized by Transmission Electron and the superconducting proximity effect.8,9 Neverthe- less, recent studies of polycrystalline diamond films10,11 did

  16. Atomistic modeling of the fracture of polycrystalline diamond O. A. Shenderova and D. W. Brenner

    E-Print Network [OSTI]

    Brenner, Donald W.

    Atomistic modeling of the fracture of polycrystalline diamond O. A. Shenderova and D. W. Brenner characteristic of GB toughness. Crack propagation in polycrystalline diamond samples under an applied load of several 001 and 011 symmetrical tilt grain boundaries GB's in diamond. Cohesive energies, the work

  17. FIELD EMISSION FROM BORON-DOPING POLYCRYSTALLINE DIAMOND FILMS ON SILICON

    E-Print Network [OSTI]

    FIELD EMISSION FROM BORON-DOPING POLYCRYSTALLINE DIAMOND FILMS ON SILICON J. A. N. Gonçalves, G. M material fail. The field emission current from boron-doped polycrystalline diamond films grown by hot Campos, SP, Brazi Abstract This work deals with the study and development of the boron-doped diamond

  18. Raman and Photoluminescence Spectroscopy of Nanocrystalline Diamond Films grown by Hot Filament CVD

    E-Print Network [OSTI]

    Bristol, University of

    H4 flow-rate ratio of standard polycrystalline diamond deposition parameters on formationRaman and Photoluminescence Spectroscopy of Nanocrystalline Diamond Films grown by Hot Filament CVD of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia b,c Diamond Research Laboratory, School

  19. Unravelling aspects of the gas phase chemistry involved in diamond chemical vapour deposition

    E-Print Network [OSTI]

    Bristol, University of

    of thin Ðlms of polycrystalline diamond by chemi- cal vapour deposition (CVD) methods,2h4 since which timeUnravelling aspects of the gas phase chemistry involved in diamond chemical vapour deposition been used to unravel details of the gas phase chemistry involved in diamond chemical vapour deposition

  20. EXPERIMENTAL DEMONSTRATION OF WAKEFIELD EFFECTS IN A 250 GHZ PLANAR DIAMOND ACCELERATING STRUCTURE*

    E-Print Network [OSTI]

    Brookhaven National Laboratory

    of a rectangular waveguide loaded with polycrystalline CVD diamond plates as an accelerating structure. It should polycrystalline diamond plates loaded in a 6 cm long waveguide (Fig. 2). The beam gap was 200 microns (Fig. TM11EXPERIMENTAL DEMONSTRATION OF WAKEFIELD EFFECTS IN A 250 GHZ PLANAR DIAMOND ACCELERATING STRUCTURE

  1. Characterization of B-doped polycrystalline diamond films using thermally stimulated luminescence

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Characterization of B-doped polycrystalline diamond films using thermally stimulated luminescence, boron level in polycrystalline diamond films was identified by TL by an intense glow peak at 226 K polycrystalline diamond films grown by Chemical Vapor Deposition (CVD) have a wide array of potential applications

  2. Synthetic diamond and wurtzite structures self-assemble with isotropic pair interactions Mikael C. Rechtsman,1

    E-Print Network [OSTI]

    Stillinger, Frank

    Synthetic diamond and wurtzite structures self-assemble with isotropic pair interactions Mikael C with strongly repulsive cores that cause the tetrahedrally coordinated diamond and wurtzite lattices-dimensional diamond and wurtzite structures can self-assemble with isotropic in- teractions possessing a strongly

  3. Electrical characterisation of defects in polycrystalline B-doped diamond films

    E-Print Network [OSTI]

    Bristol, University of

    applied to B-doped thin polycrystalline diamond films deposited on p+ -silicon by hot filament chemical]. Recently valuable information about defects in monocrystalline [3] and polycrystalline [7] diamond filmsElectrical characterisation of defects in polycrystalline B-doped diamond films O. S. Elsherif 1, a

  4. Electronic, Magnetic and Thermal Properties of Graphene-Diamond Hybrid S. Konabe,2, 3

    E-Print Network [OSTI]

    Maruyama, Shigeo

    of the graphene-diamond hybrid system. Energies are mea- sured from that of the Fermi level. Blue and redElectronic, Magnetic and Thermal Properties of Graphene-Diamond Hybrid Structure T. Shiga,1 S, it is demonstrated that the heat generated in the graphene nanoribbon can efficiently dissipate to the diamond region

  5. Diamond-Silicon Carbide Composite And Method For Preparation Thereof

    DOE Patents [OSTI]

    Qian, Jiang (Los Alamos, NM); Zhao, Yusheng (Los Alamos, NM)

    2005-09-06T23:59:59.000Z

    Fully dense, diamond-silicon carbide composites are prepared from ball-milled microcrystalline diamond/amorphous silicon powder mixture. The ball-milled powder is sintered (P=5-8 GPa, T=1400K-2300K) to form composites having high fracture toughness. A composite made at 5 GPa/1673K had a measured fracture toughness of 12 MPa.multidot.m.sup.1/2. By contrast, liquid infiltration of silicon into diamond powder at 5 GPa/1673K produces a composite with higher hardness but lower fracture toughness. X-ray diffraction patterns and Raman spectra indicate that amorphous silicon is partially transformed into nanocrystalline silicon at 5 GPa/873K, and nanocrystalline silicon carbide forms at higher temperatures.

  6. Mapping the location and configuration of nitrogen in diamond nanoparticles.

    SciTech Connect (OSTI)

    Barnard, A. S.; Sternberg, M.; Center for Nanoscale Materials; Univ. of Oxford

    2007-01-17T23:59:59.000Z

    Understanding how impurities such as nitrogen are included in diamond nanoparticles is expected to be important for use in future nanodevices, such as qubits for quantum computing. Most commercial diamond nanoparticles contain approximately 2-3% nitrogen, but it is difficult to determine experimentally whether it is located within the core or at the surface of the nanoparticles. Presented here are density functional tight-binding simulations examining the configuration and potential energy surface of substitutional nitrogen in diamond nanoparticles, directly comparing results of different sizes, shapes and surface chemistry. The results predict that nitrogen is metastable within the core of both hydrogenated and dehydrogenated particles, but that the binding energy, coordination and preferred location is dependent upon the structure of the nanoparticle as a whole.

  7. Synthesis and characterization of a nanocrystalline diamond aerogel

    SciTech Connect (OSTI)

    Pauzauskie, Peter J.; Crowhurst, Jonathan C.; Worsley, Marcus A.; Laurence, Ted A.; Kilcoyne, A. L. David; Wang, Yinmin; Willey, Trevor M.; Visbeck, Kenneth S.; Fakra, Sirine C.; Evans, William J.; Zaug, Joseph M.; Satcher, Jr., Joe H.

    2011-07-06T23:59:59.000Z

    Aerogel materials have myriad scientific and technological applications due to their large intrinsic surface areas and ultralow densities. However, creating a nanodiamond aerogel matrix has remained an outstanding and intriguing challenge. Here we report the high-pressure, high-temperature synthesis of a diamond aerogel from an amorphous carbon aerogel precursor using a laser-heated diamond anvil cell. Neon is used as a chemically inert, near-hydrostatic pressure medium that prevents collapse of the aerogel under pressure by conformally filling the aerogel's void volume. Electron and X-ray spectromicroscopy confirm the aerogel morphology and composition of the nanodiamond matrix. Time-resolved photoluminescence measurements of recovered material reveal the formation of both nitrogen- and silicon- vacancy point-defects, suggesting a broad range of applications for this nanocrystalline diamond aerogel.

  8. Dichroism and birefringence of natural violet diamond crystals

    SciTech Connect (OSTI)

    Konstantinova, A. F. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)], E-mail: afkonst@ns.crys.ras.ru; Titkov, S. V. [Russian Academy of Sciences, Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (Russian Federation); Imangazieva, K. B. [Issyk Kul State University (Kyrgyzstan); Evdishchenko, E. A. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation); Sergeev, A. M. [Karpov Institute of Physical Chemistry, State Scientific Center of the Russian Federation (Russian Federation); Zudin, N. G. [OOO Roni Kerob (Russian Federation); Orekhova, V. P. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)

    2006-05-15T23:59:59.000Z

    Investigation of the optical properties of natural violet diamonds from the Yakutian kimberlites is performed. A red shift of the absorption edge is revealed in the absorption spectra of these crystals. This shift is indicative of the presence of a high concentration of nitrogen in the diamonds studied. Along with the strong band at 0.550 {mu}m, weaker bands at 0.390, 0.456 and 0.496 {mu}m are revealed. It is shown that violet diamond crystals have birefringence and dichroism of about 10{sup -5} and 10{sup -6}, respectively. When a light beam propagates perpendicularly to colored lamellas, the dichroism is much larger and the birefringence is smaller than in the case where the beam direction is parallel to lamellas.

  9. Subtractive 3D Printing of Optically Active Diamond Structures

    E-Print Network [OSTI]

    Martin, Aiden A; Aharonovich, Igor

    2014-01-01T23:59:59.000Z

    Diamond has recently attracted considerable attention as a promising platform for quantum technologies, photonics and high resolution sensing applications. Here we demonstrate a chemical approach that enables the fabrication of functional diamond structures using gas-mediated electron induced etching. The method achieves chemical etching at room temperature through the dissociation of surface-adsorbed H2O molecules by electron irradiation in a water vapor environment. High throughput, parallel processing is possible by electron flood exposure and the use of an etch mask, while single step, mask-free three dimensional fabrication and iterative editing are achieved using a variable pressure scanning electron microscope. The electron induced chemical etching paves the way to a transformative technology for nanofabrication of diamond and other wide band-gap semiconductors.

  10. Diamond tool wear of electrodeposited nickel-phosphorus alloy

    SciTech Connect (OSTI)

    Dini, J.W.; Donaldson, R.R.; Syn, C.K. (Lawrence Livermore National Lab., CA (USA)); Sugg, D.J. (Techmetals, Inc., Dayton, OH (USA))

    1990-02-01T23:59:59.000Z

    Nickel-Phosphorus alloys are attractive materials for diamond turning applications such as fabrication of large optics and other high precision parts. Although the mechanism is not understood, diamond tool wear is minimized when the phosphorus content of the deposit is greater than 11% (wgt). In recent years, increased attention has been directed at electrodeposition as an alternate to electroless deposition for producing Ni-P alloys. One principal advantage of the electrodeposition process is that alloys with 14--15% P can be obtained; another is that an order of magnitude greater deposition thickness can be provided if necessary. This paper compares diamond turning results for electrodeposited and electroless Ni-P alloys and shows that the electrodeposited coatings provide promising results. 28 refs., 7 figs., 1 tab.

  11. Thrust and efficiency model for electron-driven magnetic nozzles Justin M. Little and Edgar Y. Choueiri

    E-Print Network [OSTI]

    Choueiri, Edgar

    Thrust and efficiency model for electron-driven magnetic nozzles Justin M. Little and Edgar Y-driven magnetic nozzles Justin M. Littlea) and Edgar Y. Choueiri Electric Propulsion and Plasma Dynamics

  12. The role of inert gas in MW-enhanced plasmas for the deposition of nanocrystalline diamond thin films

    E-Print Network [OSTI]

    Bristol, University of

    in polycrystalline diamond film CVD [3,4]. While the mechanical, thermal and acoustic properties of MCD films haveThe role of inert gas in MW-enhanced plasmas for the deposition of nanocrystalline diamond thin diamond Nanocrystalline Inert gas Growth Nanocrystalline diamond thin films have been deposited using

  13. High-pressure X-ray absorption fine structure in the diamond anvil cell and its applications in geological materials

    E-Print Network [OSTI]

    Duffy, Thomas S.

    nano- polycrystalline diamond instead of single crystal anvils, the influence of diamond diffractionHigh-pressure X-ray absorption fine structure in the diamond anvil cell and its applications fine structure in the diamond anvil cell and its applications in geological materials Xinguo Hong1

  14. Fabrication of Diamond Nanowires for Quantum Information Processing Applications

    E-Print Network [OSTI]

    Birgit Hausmann; Mughees Khan; Tom Babinec; Yinan Zhang; Katie Martinick; Murray McCutcheon; Phil Hemmer; Marko Loncar

    2010-02-23T23:59:59.000Z

    We present a design and a top-down fabrication method for realizing diamond nanowires in both bulk single crystal and polycrystalline diamond. Numerical modeling was used to study coupling between a Nitrogen Vacancy (NV) color center and optical modes of a nanowire, and to find an optimal range of nanowire diameters that allows for large collection efficiency of emitted photons. Inductively coupled plasma (ICP) reactive ion etching (RIE) with oxygen is used to fabricate the nanowires. Drop-casted nanoparticles (including $\\mathrm{Au}$, $\\mathrm{SiO_{2}}$ and $\\mathrm{Al_2O_3}$) as well as electron beam lithography defined spin-on glass and evaporated $\\mathrm{Au}$ have been used as an etch mask. We found $\\mathrm{Al_2O_3}$ nanoparticles to be the most etch resistant. At the same time FOx e-beam resist (spin-on glass) proved to be a suitable etch mask for fabrication of ordered arrays of diamond nanowires. We were able to obtain nanowires with near vertical sidewalls in both polycrystalline and single crystal diamond. The heights and diameters of the polycrystalline nanowires presented in this paper are $\\unit[\\approx1]{\\mu m}$ and $\\unit[120-340]{nm}$, respectively, having a $\\unit[200]{nm/min}$ etch rate. In the case of single crystal diamond (types Ib and IIa) nanowires the height and diameter for different diamonds and masks shown in this paper were $\\unit[1-2.4]{\\mu m}$ and $\\unit[120-490]{nm}$ with etch rates between $\\unit[190-240]{nm/min}$.

  15. Measurement of normal thrust and evaluation of upper-convected Maxwell models for molten plastics in large amplitude oscillatory shear

    E-Print Network [OSTI]

    Oakley, Jason Glen

    1992-01-01T23:59:59.000Z

    with Relaxation Spectrum Re- ported by Khan and Larson (1987) . IV. 5 Normal Thrust Measurements IV. 6 Mewts-Denn Model Compared With Normal Thrust Measure- ments 37 42 44 46 49 V CONCLUSION REFERENCES APPENDIX FIGURES . . APPENDIX Pa, ge B FIRST... tensor, this is also referred to as the Maxwell model. I. 5 1 Maxwell Model Dealy and Wissbrun (1990) give the Boltzmann superposition principle in the material objective (ie. frame indifferent) integral form in terms of a memory function...

  16. Smooth diamond films as low friction, long wear surfaces

    DOE Patents [OSTI]

    Gruen, Dieter M. (Downers Grove, IL); Krauss, Alan R. (Naperville, IL); Erdemir, Ali (Naperville, IL); Bindal, Cuma (Woodridge, IL); Zuiker, Christopher D. (LaGrange, IL)

    1999-01-01T23:59:59.000Z

    An article and method of manufacture of a nanocrystalline diamond film. The nanocrystalline film is prepared by forming a carbonaceous vapor, providing an inert gas containing gas stream and combining the gas stream with the carbonaceous containing vapor. A plasma of the combined vapor and gas stream is formed in a chamber and fragmented carbon species are deposited onto a substrate to form the nanocrystalline diamond film having a root mean square flatness of about 50 nm deviation from flatness in the as deposited state.

  17. Diamond turning of Si and Ge single crystals

    SciTech Connect (OSTI)

    Blake, P.; Scattergood, R.O.

    1988-12-01T23:59:59.000Z

    Single-point diamond turning studies have been completed on Si and Ge crystals. A new process model was developed for diamond turning which is based on a critical depth of cut for plastic flow-to-brittle fracture transitions. This concept, when combined with the actual machining geometry for single-point turning, predicts that {open_quotes}ductile{close_quotes} machining is a combined action of plasticity and fracture. Interrupted cutting experiments also provide a meant to directly measure the critical depth parameter for given machining conditions.

  18. Boron-doped superlattices and Bragg mirrors in diamond

    SciTech Connect (OSTI)

    Fiori, A. [University of Grenoble Alpes, Inst. NEEL, 38042 Grenoble (France); CNRS, Inst. NEEL, 25 rue des Martyrs, 38042 Grenoble (France); National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Bousquet, J.; Eon, D.; Omnès, F.; Bustarret, E., E-mail: Etienne.bustarret@neel.cnrs.fr [University of Grenoble Alpes, Inst. NEEL, 38042 Grenoble (France); CNRS, Inst. NEEL, 25 rue des Martyrs, 38042 Grenoble (France); Bellet-Amalric, E. [University of Grenoble Alpes, Inst. NEEL, 38042 Grenoble (France); CEA-Grenoble, INAC/SP2M, 17 rue des Martyrs, 38054 Grenoble (France)

    2014-08-25T23:59:59.000Z

    A periodic modulation of the boron doping level of single crystal diamond multilayers over more than three orders of magnitude during epitaxial growth by microwave plasma-enhanced chemical vapor deposition is shown to yield Bragg mirrors in the visible. The thicknesses and doping level of the individual layers were controlled by in situ spectroscopic ellipsometry, enabling to tune the reflectance peak to the wavelength range of diamond color centers, such as NV{sup 0} or NV{sup ?}. The crystalline quality, periodicity, and sharpness of the doping transitions in these doping superlattices over tens of periods were confirmed by high resolution X-ray diffraction.

  19. Nano-manipulation of diamond-based single photon sources

    E-Print Network [OSTI]

    E. Ampem-Lassen; D. A. Simpson; B. C. Gibson; S. Trpkovski; F. M. Hossain; S. T. Huntington; K. Ganesan; L. C. L. Hollenberg; S. Prawer

    2009-05-18T23:59:59.000Z

    The ability to manipulate nano-particles at the nano-scale is critical for the development of active quantum systems. This paper presents a new technique to manipulate diamond nano-crystals at the nano-scale using a scanning electron microscope, nano-manipulator and custom tapered optical fibre probes. The manipulation of a ~ 300 nm diamond crystal, containing a single nitrogen-vacancy centre, onto the endface of an optical fibre is demonstrated. The emission properties of the single photon source post manipulation are in excellent agreement with those observed on the original substrate.

  20. Wear Analysis of Wind Turbine Gearbox Bearings

    SciTech Connect (OSTI)

    Blau, Peter Julian [ORNL; Walker, Larry R [ORNL; Xu, Hanbing [ORNL; Parten, Randy J [ORNL; Qu, Jun [ORNL; Geer, Tom [ORNL

    2010-04-01T23:59:59.000Z

    The objective of this effort was to investigate and characterize the nature of surface damage and wear to wind turbine gearbox bearings returned from service in the field. Bearings were supplied for examination by S. Butterfield and J. Johnson of the National Wind Technology Center (NREL), Boulder, Colorado. Studies consisted of visual examination, optical and electron microscopy, dimensional measurements of wear-induced macro-scale and micro-scale features, measurements of macro- and micro-scale hardness, 3D imaging of surface damage, studies of elemental distributions on fracture surfaces, and examinations of polished cross-sections of surfaces under various etched and non-etched conditions.

  1. Bear Creek Wind Farm | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty EditCalifornia: EnergyAvignon, France:Barstow,Bayport Biomass FacilityBear CanyonBear

  2. CX-005128: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    The Development of Open, Water Lubricated Polycrystalline Diamond Thrust Bearings For use in Marine Hydrokinetic (MHK) Energy MachinesCX(s) Applied: A9, B3.6Date: 01/25/2011Location(s): Orem, UtahOffice(s): Energy Efficiency and Renewable Energy, Golden Field Office

  3. CX-005184: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    The Development of Open, Water Lubricated Polycrystalline Diamond Thrust Bearings For use in Marine Hydrokinetic Energy MachinesCX(s) Applied: A9, B3.6Date: 01/28/2011Location(s): Orem, UtahOffice(s): Energy Efficiency and Renewable Energy, Golden Field Office

  4. Induction Motors Bearing Failures Detection and Diagnosis

    E-Print Network [OSTI]

    Boyer, Edmond

    using the mains current and the rotor speed measurement. The proposed approach is based on the stator current Park patterns. Induction motor stator currents are measured, recorded and used for Park patterns detection and diagnosis process. Experimental tests with artificial bearing damages results show

  5. Experimental verification of bifurcation in fluid bearings

    E-Print Network [OSTI]

    Deepak, James Christopher

    1997-01-01T23:59:59.000Z

    The thesis presents the results of the experiments that were conducted on short and long fluid film bearings with a simple single disk rotor. The behavior of the journal was analyzed as function of the rotor system parameters such as the load, speed...

  6. Quantum optics with nitrogen-vacancy centers in diamond

    E-Print Network [OSTI]

    Yiwen Chu; Mikhail D. Lukin

    2015-04-22T23:59:59.000Z

    We review the electronic level structure of the nitrogen-vacancy in diamond and some common experimental techniques to study its optical properties at low temperatures. We then summarize several recent experiments and advances in using nitrogen-vacancy centers for quantum optics.

  7. Single Crystal Diamond Beam Position Monitors with Radiofrequency Electronic Readout

    SciTech Connect (OSTI)

    Solar, B.; Graafsma, H.; Potdevin, G.; Trunk, U. [Hasylab, Deutsches Elektronen Synchroton, Hamburg (Germany); Morse, J.; Salome, M. [Instrumentation Services and Development Division, European Synchroton Radiation Facility, Grenoble (France)

    2010-06-23T23:59:59.000Z

    Over the energy range 5{approx}30 keV a suitably contacted, thin ({approx}100 {mu}m) diamond plate can be operated in situ as a continuous monitor of X-ray beam intensity and position as the diamond absorbs only a small percentage of the incident beam. Single crystal diamond is a completely homogeneous material showing fast (ns), spatially uniform signal response and negligible (diamond beam position monitors of simple quadrant electrode designs with metal contacts, operated using wideband electronic readout corresponding to the RF accelerator frequency. The instrumentation for these monitors must cover a large range of operating conditions: different beam sizes, fluxes, energies and time structure corresponding to the synchrotron fill patterns. Sophisticated new RF sampling electronics can satisfy most requirements: using a modified Libera Brilliance readout system, we measured the center of gravity position of a 25 {mu}m beam at the DORIS III F4 beam line at a rate of 130 Msample/s with narrowband filtering of a few MHz bandwidth. Digitally averaging the signal further provided a spatial resolution {approx}20 nm.

  8. New route to the fabrication of nanocrystalline diamond films

    SciTech Connect (OSTI)

    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

    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.

  9. Hydrogeologic Assessment of the East Bear Creek Unit, San Luis National Wildlife Refuge

    E-Print Network [OSTI]

    Quinn, Nigel W.T.

    2007-01-01T23:59:59.000Z

    Addendum to East Bear Creek Design Data Report, Centraltest wells in East Bear Creek Unit ……………. 41 Appendix B :C : East Bear Creek Refuge Water Supply ……………………………………. 64

  10. Strain based preload measurement in drive axle pinion bearings

    E-Print Network [OSTI]

    Thomas, Anthony H., 1981-

    2005-01-01T23:59:59.000Z

    Bearing setting has a significant impact on bearing life and system performance. A strain based load measurement technique that has been previously developed and patented will be used to measure preload in automotive drive ...

  11. Design, dynamic modeling, simulation and feedback control of hydrostatic bearing

    E-Print Network [OSTI]

    Rothenhöfer, Gerald S. (Gerald Sven)

    2007-01-01T23:59:59.000Z

    A hydrostatic bearing carriage (Hydrocline) that uses an open face linear motor to drive the carriage as well as to preload the hydrostatic bearings has been developed by Professor Alexander Slocum and Gerald Rothenhöfer ...

  12. Recommendation 195: Mitigation of Contamination in Bear Creek Burial Grounds

    Broader source: Energy.gov [DOE]

    The ORSSAB requests DOE provide possible remedial actions to mitigate releases of contamination from Bear Creek Burial Grounds.

  13. Structure and evolution of the East Sierran thrust system, east central California

    E-Print Network [OSTI]

    Dunne, George C.; Walker, J. Douglas

    2004-08-01T23:59:59.000Z

    . Geologic sketch map of the southern Inyo Mountains. IMVC is Inyo Mountains Volcanic Complex of Dunne et al. [1998]. Informal pluton names are as follows: F, French Spring; B, Black Warrior; L, Long John. TC4012 DUNNE AND WALKER: EAST SIERRAN THRUST SYSTEM 2... by the Dolomite Canyon fault and by contractional shear zones in the upper plate of the Dolomite fault; truncations reveal a component of right drag; (2) prominent shear zone in Black Warrior pluton (163 Ma; SI-D91-3) shows a gently plunging mineral lineation...

  14. Thrust 1: Structure and Dynamics of Simple Fluid-Solid Interfaces (Peter T. Cumm

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItemResearch >Internship Program The NIF andPointsThrust 1: Structure and Dynamics of

  15. Notes 03. Kinematics of motion in cylindrical journal bearings

    E-Print Network [OSTI]

    San Andres, Luis

    2009-01-01T23:59:59.000Z

    PhVUx PhV zx ? ????? ??? ?? 12;212 22 (3.3) leads to Reynolds Equation of Classical Lubrication Theory, ? ? ? ? ?? ? ?? ? ? ? ? ?? ?? ? ?? ? ? ? ? ??? ??? ? z Ph zx Ph x... ?? ? ?? ? ? ? ? ? ? ? ?? ? ? ?? ?? ?? ? ? ?? ? ? ??? (3.5) Fluid Flow in a Cylindrical Journal Bearing Cylindrical fluid film bearings are commonly used to support loads, static and dynamic, in rotating machinery. These lubricated bearings also introduce viscous damping that aids in reducing...

  16. SHORT COMMUNICATION Behaviour of brown bears killing wild ungulates

    E-Print Network [OSTI]

    Boyer, Edmond

    SHORT COMMUNICATION Behaviour of brown bears killing wild ungulates in the Cantabrian Mountains documentation regarding bear predation on wild ungulates in Southern Europe. We describe search, detection wild boar by a female bear with cubs surprised by a sudden encounter. They did not eat the boar after

  17. Diamond Wire Saw for Precision Machining of Laser Target Components

    SciTech Connect (OSTI)

    Bono, M J; Bennett, D W

    2005-08-08T23:59:59.000Z

    The fabrication of precision laser targets requires a wide variety of specialized mesoscale manufacturing techniques. The diamond wire saw developed in this study provides the capability to precisely section meso-scale workpieces mounted on the assembly stations used by the Target Fabrication Group. This new capability greatly simplifies the fabrication of many types of targets and reduces the time and cost required to build the targets. A variety of materials are used to fabricate targets, including metals, plastics with custom designed chemical formulas, and aerogels of various densities. The materials are usually provided in the form of small pieces or cast rods that must be machined to the required shape. Many of these materials, such as metals and some plastics, can be trimmed using a parting tool on a diamond turning machine. However, other materials, such as aerogels and brittle materials, cannot be adequately cut with a parting tool. In addition, the geometry of the parts often requires that the workpieces be held in a special assembly station, which excludes the use of a parting tool. In the past, these materials were sectioned using a small, handheld coping saw that used a diamond-impregnated wire as a blade. This miniature coping saw was effective, but it required several hours to cut through certain materials. Furthermore, the saw was guided by hand and often caused significant damage to fragile aerogels. To solve these problems, the diamond wire saw shown in Figure 1 was developed. The diamond wire saw is designed to machine through materials that are mounted in the Target Fabrication Group's benchtop assembly stations. These assembly stations are the primary means of aligning and assembling target components, and there is often a need to machine materials while they are mounted in the assembly stations. Unfortunately, commercially available saws are designed for very different applications and are far too large to be used with the assembly stations. Therefore, a custom diamond wire saw was designed and constructed. The diamond wire saw cuts through workpieces using a continuous loop of diamond-impregnated wire of length 840 mm. The wire loop runs around several idler pulleys and is driven by a simple geared DC motor that rotates at 17 rpm. The linear speed of the wire is 107 inches/minute. The saw is oriented at an angle of 20{sup o} from horizontal, so the operator can view the wire through the cutout at the front end of the saw. When looking through a microscope or camera with a horizontal line of sight, the operator can clearly see the wire as it cuts through the workpiece, as shown in the right side of Figure 1. The saw is mounted on a two-axis stage that allows the operator to align the wire with the workpiece. To cut through the workpiece, the operator drives the wire through the workpiece by turning the feed micrometer. An image of the interior of the diamond wire saw appears in Figure 2. This picture was taken after removing the protective cover plate from the saw.

  18. A two-dimensional finite difference model of the effects of erosion on the evolution of pore pressure within a moving thrust sheet

    E-Print Network [OSTI]

    Sales, James Gregory

    1994-01-01T23:59:59.000Z

    conditions (see Table 2) where all niodcl layers are assigned R values representative of a) sandstone, b) shale, and c) limestone; shown at the 1'inal stage of thrust loading. H was held constant at 1. 2xl0'o Pa i 36 13 Excess pore pressure for thrust... tectonic style of orogens and individual thrust. sheets. Johnson (1981), for instance, suggested that the Keystone thrust of southeast Nevada traveled as much as eighty-eight kilometers facilitated by the removal of the lithostatic load. More generally...

  19. Gerotor and bearing system for whirling mass orbital vibrator

    DOE Patents [OSTI]

    Brett, James Ford; Westermark, Robert Victor; Turner Jr., Joey Earl; Lovin, Samuel Scott; Cole, Jack Howard; Myers, Will

    2007-02-27T23:59:59.000Z

    A gerotor and bearing apparatus for a whirling mass orbital vibrator which generates vibration in a borehole. The apparatus includes a gerotor with an inner gear rotated by a shaft having one less lobe than an outer gear. A whirling mass is attached to the shaft. At least one bearing is attached to the shaft so that the bearing engages at least one sleeve. A mechanism is provided to rotate the inner gear, the mass and the bearing in a selected rotational direction in order to cause the mass, the inner gear, and the bearing to backwards whirl in an opposite rotational direction. The backwards whirling mass creates seismic vibrations.

  20. Process for making a cesiated diamond film field emitter and field emitter formed therefrom

    DOE Patents [OSTI]

    Anderson, D.F.; Kwan, S.W.

    1999-03-30T23:59:59.000Z

    A process for making a cesiated diamond film comprises (a) depositing a quantity of cesium iodide on the diamond film in a vacuum of between about 10{sup {minus}4} Torr and about 10{sup {minus}7} Torr, (b) increasing the vacuum to at least about 10{sup {minus}8} Torr, and (c) imposing an electron beam upon the diamond film, said electron beam having an energy sufficient to dissociate said cesium iodide and to incorporate cesium into interstices of the diamond film. The cesiated diamond film prepared according to the process has an operating voltage that is reduced by a factor of at least approximately 2.5 relative to conventional, non-cesiated diamond film field emitters. 2 figs.

  1. Method for producing fluorinated diamond-like carbon films

    DOE Patents [OSTI]

    Hakovirta, Marko J.; Nastasi, Michael A.; Lee, Deok-Hyung; He, Xiao-Ming

    2003-06-03T23:59:59.000Z

    Fluorinated, diamond-like carbon (F-DLC) films are produced by a pulsed, glow-discharge plasma immersion ion processing procedure. The pulsed, glow-discharge plasma was generated at a pressure of 1 Pa from an acetylene (C.sub.2 H.sub.2) and hexafluoroethane (C.sub.2 F.sub.6) gas mixture, and the fluorinated, diamond-like carbon films were deposited on silicon <100>substrates. The film hardness and wear resistance were found to be strongly dependent on the fluorine content incorporated into the coatings. The hardness of the F-DLC films was found to decrease considerably when the fluorine content in the coatings reached about 20%. The contact angle of water on the F-DLC coatings was found to increase with increasing film fluorine content and to saturate at a level characteristic of polytetrafluoroethylene.

  2. Negative vacuum energy densities and the causal diamond measure

    SciTech Connect (OSTI)

    Salem, Michael P. [Institute of Cosmology, Department of Physics and Astronomy, Tufts University, Medford, Massachusetts 02155 (United States)

    2009-07-15T23:59:59.000Z

    Arguably a major success of the landscape picture is the prediction of a small, nonzero vacuum energy density. The details of this prediction depend in part on how the diverging spacetime volume of the multiverse is regulated, a question that remains unresolved. One proposal, the causal diamond measure, has demonstrated many phenomenological successes, including predicting a distribution of positive vacuum energy densities in good agreement with observation. In the string landscape, however, the vacuum energy density is expected to take positive and negative values. We find the causal diamond measure gives a poor fit to observation in such a landscape - in particular, 99.6% of observers in galaxies seemingly just like ours measure a vacuum energy density smaller than we do, most of them measuring it to be negative.

  3. Superconducting single photon detectors integrated with diamond nanophotonic circuits

    E-Print Network [OSTI]

    Rath, Patrik; Ferrari, Simone; Sproll, Fabian; Lewes-Malandrakis, Georgia; Brink, Dietmar; Ilin, Konstantin; Siegel, Michael; Nebel, Christoph; Pernice, Wolfram

    2015-01-01T23:59:59.000Z

    Photonic quantum technologies promise to repeat the success of integrated nanophotonic circuits in non-classical applications. Using linear optical elements, quantum optical computations can be performed with integrated optical circuits and thus allow for overcoming existing limitations in terms of scalability. Besides passive optical devices for realizing photonic quantum gates, active elements such as single photon sources and single photon detectors are essential ingredients for future optical quantum circuits. Material systems which allow for the monolithic integration of all components are particularly attractive, including III-V semiconductors, silicon and also diamond. Here we demonstrate nanophotonic integrated circuits made from high quality polycrystalline diamond thin films in combination with on-chip single photon detectors. Using superconducting nanowires coupled evanescently to travelling waves we achieve high detection efficiencies up to 66 % combined with low dark count rates and timing resolu...

  4. Diamond neutral particle spectrometer for fusion reactor ITER

    SciTech Connect (OSTI)

    Krasilnikov, V.; Amosov, V.; Kaschuck, Yu.; Skopintsev, D. [Institution PROJECT CENTER ITER, 1, Akademik Kurchatov Sq., Moscow (Russian Federation)

    2014-08-21T23:59:59.000Z

    A compact diamond neutral particle spectrometer with digital signal processing has been developed for fast charge-exchange atoms and neutrons measurements at ITER fusion reactor conditions. This spectrometer will play supplementary role for Neutral Particle Analyzer providing 10 ms time and 30 keV energy resolutions for fast particle spectra in non-tritium ITER phase. These data will also be implemented for independent studies of fast ions distribution function evolution in various plasma scenarios with the formation of a single fraction of high-energy ions. In tritium ITER phase the DNPS will measure 14 MeV neutrons spectra. The spectrometer with digital signal processing can operate at peak counting rates reaching a value of 10{sup 6} cps. Diamond neutral particle spectrometer is applicable to future fusion reactors due to its high radiation hardness, fast response and high energy resolution.

  5. Diamond Amplified Photocathode at BNL | U.S. DOE Office of Science...

    Office of Science (SC) Website

    Diamond amplified photocathode Developed at: Brookhaven National Laboratory, New York Developed in: 2004-2007 Result of NP research: Electron cooling R&D for RHIC...

  6. Wireless Network Simplification: the Gaussian N-Relay Diamond Network

    E-Print Network [OSTI]

    " as opposed to s 1 2 ... N d h1s h2s hNs h1d h2d hNd Fig. 1. The Gaussian N-relay diamond network. The source is the loss in the capacity if we simplify the network by removing all but k of the N relays (for example, if we remove all but one of the relays). The performance loss can depend on the channel gains. Indeed

  7. HIGH-CURRENT COLD CATHODE EMPLOYING DIAMOND AND RELATED MATERIALS

    SciTech Connect (OSTI)

    Hirshfield, Jay L.

    2014-10-22T23:59:59.000Z

    The essence of this project was for diamond films to be deposited on cold cathodes to improve their emission properties. Films with varying morphology, composition, and size of the crystals were deposited and the emission properties of the cathodes that utilize such films were studied. The prototype cathodes fabricated by the methods developed during Phase I were tested and evaluated in an actual high-power RF device during Phase II. These high-power tests used the novel active RF pulse compression system and the X-band magnicon test facility at US Naval Research Laboratory. In earlier tests, plasma switches were employed, while tests under this project utilized electron-beam switching. The intense electron beams required in the switches were supplied from cold cathodes embodying diamond films with varying morphology, including uncoated molybdenum cathodes in the preliminary tests. Tests with uncoated molybdenum cathodes produced compressed X-band RF pulses with a peak power of 91 MW, and a maximum power gain of 16.5:1. Tests were also carried out with switches employing diamond coated cathodes. The pulse compressor was based on use of switches employing electron beam triggering to effect mode conversion. In experimental tests, the compressor produced 165 MW in a ~ 20 ns pulse at ~18× power gain and ~ 140 MW at ~ 16× power gain in a 16 ns pulse with a ~ 7 ns flat-top. In these tests, molybdenum blade cathodes with thin diamond coatings demonstrated good reproducible emission uniformity with a 100 kV, 100 ns high voltage pulse. The new compressor does not have the limitations of earlier types of active pulse compressors and can operate at significantly higher electric fields without breakdown.

  8. Strategies for improving traffic operations at oversaturated signalized diamond interchanges

    E-Print Network [OSTI]

    Herrick, George Curtis

    1992-01-01T23:59:59.000Z

    to reduce both recurring and nonrecurring congestion. Incident detection and management systems can be implemented on freeways to decrease incident durations and reduce the resulting traffic congestion. Surveillance and control systems can be integrated... urban diamond interchanges, the traffic engineer needs to better understand these control strategies and seek new and innovative control strategies to more effectively address them. This research addressed two major objectives. The first objective...

  9. Use of diamond-turned mirrors for synchrotron radiation (SR)

    SciTech Connect (OSTI)

    Howells, M.R.; Takacs, P.Z.

    1981-01-01T23:59:59.000Z

    The diamond turning technique has great interest for users of synchrotron radiation because of its ability to produce surfaces of arbitrary shape. It also has the advantage of being well adapted to producing metal optics. These are of interest because they lend themselves to water cooling and hence represent one approach to the problem of high synchrotron radiation power loadings on optical surfaces. The optical figure produced by diamond turning is generally adequate for synchrotron radiation applications. The main difficulty centers around the question of smoothness. Diamond turned surfaces must receive a final polish after machining before they are sufficiently smooth for use with ultra-violet or x-ray radiation. The manufacturing stages can be carried out by various groups in the optics industry and the National Synchrotron Light Source has procured a considerable number of mirrors and is having them polished for use on the vuv storage ring. At the time of writing one mirror has been completed and evaluated and we give the results for this and discuss the indications for the future. The important measurement of the r.m.s. height of the surface roughness has given a value of 3 +- 0.9A using total integrated scatter of visible light at normal incidence.

  10. Elastohydrodynamic behavior of compliant slider bearings

    E-Print Network [OSTI]

    Herrington, Rodney Emerson

    1973-01-01T23:59:59.000Z

    ctions 65 3 Z Two dimensional bearing displacements . 33 Film thickness variation due to Poisson's ratio . 34 Film thickness variation due to elastic modulus . 35 Film thickness variation due to loading . 36 Film thickness variation due to viscosity... measurements of tangential and normal forces during the rotation of a lower conical platen. Stresses were found from the equation 3M I Z 2TrR where M is the total torque exerted by the liquid and R is the radius 0 of the cone-plate system. Also, (7- g ZF...

  11. High Temperature, Permanent Magnet Biased Magnetic Bearings

    E-Print Network [OSTI]

    Gandhi, Varun R.

    2010-07-14T23:59:59.000Z

    , then the molding process was carried out to form the potting cement on the each stator. After this the stators are baked in the oven and once ready the magnets and back-irons are put onto the stator. Shown below in Figure 3-11 is an assembly tool designed... rings. The bearing and its support rings were then carried onto the test rig and mounted at one end of the table. Throughout the assembly process a lot of care had to be taken so as to avoid damaging of the permanent magnets, stator and its coils...

  12. Bear Creek Valley Watershed | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments fromofBatteries from Brine Batteries fromThermalBe aBear Creek

  13. Sleeping Bear Wind Farm | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:Ezfeedflag JumpID-f < RAPID‎ |Rippey JumpAirPowerSilcioEthanolSkyline HighSleeping Bear

  14. Bear Canyon Geothermal Facility | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty EditCalifornia: EnergyAvignon, France:Barstow,Bayport Biomass FacilityBear Canyon

  15. Bear Valley Electric Service | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty EditCalifornia: EnergyAvignon, France:Barstow,Bayport Biomass FacilityBear

  16. Amorphous Diamond Flat Panel Displays - Final Report of ER-LTR CRADA project with SI Diamond Technology

    SciTech Connect (OSTI)

    Ager III, Joel W.

    1998-05-08T23:59:59.000Z

    The objective of this project was to determine why diamond-based films are unusually efficient electron emitters (field emission cathodes) at room temperature. Efficient cathodes based on diamond are being developed by SI Diamond Technology (SIDT) as components for bright, sunlight-readable, flat panel displays. When the project started, it was known that only a small fraction (<1%) of the cathode area is active in electron emission and that the emission sites themselves are sub-micron in size. The critical challenge of this project was to develop new microcharacterization methods capable of examining known emission sites. The research team used a combination of cathode emission imaging (developed at SIDT), micro-Raman spectroscopy (LBNL), and electron microscopy and spectroscopy (National Center for Electron Microscopy, LBNL) to examine the properties of known emission sites. The most significant accomplishment of the project was the development at LBNL of a very high resolution scanning probe that, for the first time, measured simultaneously the topography and electrical characteristics of single emission sites. The increased understanding of the emission mechanism helped SIDT to develop a new cathode material,''nano-diamond,'' which they have incorporated into their Field Emission Picture Element (FEPix) product. SIDT is developing large-format flat panel displays based on these picture elements that will be brighter and more efficient than existing outdoor displays such as Jumbotrons. The energy saving that will be realized if field emission displays are introduced commercially is in line with the energy conservation mission of DOE. The unique characterization tools developed in this project (particularly the new scanning microscopy method) are being used in ongoing BES-funded basic research.

  17. Deposition of CVD diamond onto GaN P.W. May a,*, H.Y. Tsai b

    E-Print Network [OSTI]

    Bristol, University of

    of the polycrystalline diamond surface would prevent light from leaking out of the GaN layer and channel it to the endsDeposition of CVD diamond onto GaN P.W. May a,*, H.Y. Tsai b , W.N. Wang c , J.A. Smith a a School performed to deposit continuous layers of CVD diamond onto epitaxial GaN films. Such diamond coatings would

  18. Abstract --This panel session paper outlines one of the re-search thrust areas in the Power System Engineering Research

    E-Print Network [OSTI]

    Oren, Shmuel S.

    1 Abstract -- This panel session paper outlines one of the re- search thrust areas in the Power- tential of harnessing the inherent flexibility of certain load types such as heating and cooling and PHEV for massive penetration of renewable resources such as wind and solar power into the mix of elec- tricity

  19. Mass movement-induced fold-and-thrust belt structures in unconsolidated sediments in Lake Lucerne (Switzerland)

    E-Print Network [OSTI]

    Gilli, Adrian

    Mass movement-induced fold-and-thrust belt structures in unconsolidated sediments in Lake Lucerne coring in Lake Lucerne, Switzerland, have revealed surprising deformation structures in flat in Lake Lucerne affecting four sections of the lake floor with areas ranging from 0Æ25 to 6Æ5 km2 in area

  20. The vertical separation of mainshock rupture and microseismicity at Qeshm island in the Zagros fold-and-thrust belt, Iran

    E-Print Network [OSTI]

    Elliott, John

    -and-thrust belt, Iran E. Nissen a, , F. Yamini-Fard b , M. Tatar b , A. Gholamzadeh b,1 , E. Bergman c , J Engineering and Seismology, PO Box 19395-3913, Tehran, Iran c Department of Physics, University of Colorado rights reserved. 1. Introduction The Zagros mountains in south-western Iran are one of the most rapidly

  1. Positive contact, self retaining bearing seals

    DOE Patents [OSTI]

    Johnson, Bruce H. (Kansas City, MO); Larsen, Lawrence E. (Kansas City, MO); Welch, Edmund F. (Kansas City, MO)

    1992-05-05T23:59:59.000Z

    An ultra-low friction bearing including an inner race, an outer race, bearing elements engaged between the inner and outer races and a seal between the inner and outer races is disclosed. The seal includes first and second sealing washers. The first washer has an outer diameter greater than an inner diameter of the outer race and an inner diameter greater than the outer diameter of the inner race. The second washer has an inner diameter less than the outer diameter of the inner race and an outer diameter less than the inner diameter of the outer race. The first washer slidably engages the outer race, the second washer slidably engages the inner race and the washers overlap and slidably engage one another. One of the washers snap fits into its respective inner or outer race while the other washer engages a stepped surface of the other of the inner and outer races. The grooved and stepped surface are offset from one another in a longitudinal direction of the races such that the washers are conically loaded thus providing a seal between the inner and outer races sufficient to prevent lubricant and contaminating particles from passing therethrough. The washers are made from a non-metallic semi-flexible low-modulus material.

  2. Notes 04. Static load performance of plain journal bearings

    E-Print Network [OSTI]

    San Andres, Luis

    2010-01-01T23:59:59.000Z

    .s/m 2 ] ? 2 4 LR L WC ? ? ? ?? = ?? ?? Modified Sommerfeld number (short length bearing) ? Journal angular speed (rad/s) NOTES 4. STATIC LOAD PERFORMANCE OF PLAIN JOURNAL BEARINGS. Dr. Luis San Andr?s ? 2010 2 For incompressible...) pressure profiles for a short length journal bearing with the following dimensions and operating characteristics. Length L=50 mm; clearance, C=100 ?m, rotational speed at 3,000 rpm (?=314 rad/s), and lubricant viscosity ?=19 centipoise (19 10 -3 N...

  3. Evidence for a mantle component shown by rare gases, C and N isotopes in polycrystalline diamonds from Orapa (Botswana)

    E-Print Network [OSTI]

    Cartigny, Pierre

    Evidence for a mantle component shown by rare gases, C and N isotopes in polycrystalline diamonds. Farley Abstract In an attempt to constrain the origin of polycrystalline diamond, combined analyses in the source of the polycrystalline diamonds from Orapa. The y13 C and y15 N isotopic values of À1.04 to À9.79x

  4. 785 nm Raman Spectroscopy of CVD Diamond Films Paul William May, James A Smith, and Keith N Rosser

    E-Print Network [OSTI]

    Bristol, University of

    . Here, we report that when using 785 nm excitation, the Raman spectra from thin polycrystalline diamond785 nm Raman Spectroscopy of CVD Diamond Films Paul William May, James A Smith, and Keith N Rosser Raman spectroscopy is a powerful technique often used to study CVD diamond films, however, very little

  5. Fabrication of diamond nanowires for quantum information processing applications Birgit J.M. Hausmann a,b,

    E-Print Network [OSTI]

    Loncar, Marko

    and polycrystalline diamond. Numerical modeling was used to study coupling between a Nitrogen Vacancy (NV) color crystal diamond. The heights and diameters of the polycrystalline nanowires presented in this paper are 1Fabrication of diamond nanowires for quantum information processing applications Birgit J

  6. High-temperature electron emission from diamond films Department of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee 37235

    E-Print Network [OSTI]

    Walker, D. Greg

    This work examines electron field-emission characteristics of polycrystalline diamond films at elevated in applications where high temperatures exist. Nitrogen-doped polycrystalline diamond films were grown by plasmaHigh-temperature electron emission from diamond films S. H. Shin Department of Mechanical

  7. Diamond growth on WC-Co substrates by hot filament chemical vapor deposition: Effect of filamentsubstrate separation

    E-Print Network [OSTI]

    Bristol, University of

    Polycrystalline diamond films have been grown by hot filament (HF) chemical vapor deposition on WC-Co bar is an established technique for growing hard, wear- resistant polycrystalline diamond films on a range of substratesDiamond growth on WC-Co substrates by hot filament chemical vapor deposition: Effect of filament

  8. Field emission properties of the polycrystalline diamond film prepared by microwave-assisted plasma chemical vapor deposition

    E-Print Network [OSTI]

    Lee, Jong Duk

    Field emission properties of the polycrystalline diamond film prepared by microwave-assisted plasma Field emission characteristics for the diamond films grown using a gas mixture of different methane V 3.0 V/ m and 9 V 5.5 V/ m , respectively, for the diamond emitter of a little poor quality grown

  9. Evidence of universality in the dynamical response of nanomechanical ultra-nanocrystalline diamond resonators at millikelvin temperatures

    E-Print Network [OSTI]

    independent theory. In particular, polycrystalline diamond is an exciting material for nanomechanical devicesEvidence of universality in the dynamical response of nanomechanical ultra-nanocrystalline diamond fabricated from ultra-nanocrystalline diamond. Frequency shift f/f0 and dissipa- tion Q-1 demonstrate

  10. Direct observation of electron emission from the grain boundaries of chemical vapour deposition diamond films by tunneling atomic force microscopy

    E-Print Network [OSTI]

    Bristol, University of

    .1063/1.3475506 Direct observation of electron emission site on boron-doped polycrystalline diamond thin films using or energy harvesting devices. Electron emission studies usually use doped polycrystalline diamond films observation of the emission sites over a large area of polycrystalline diamond using tunneling atomic force

  11. 785 nm Raman spectroscopy of CVD diamond films P.W. May , J.A. Smith, K.N. Rosser

    E-Print Network [OSTI]

    Bristol, University of

    using 785 nm excitation with 1 µm spot size, the Raman spectra from thin polycrystalline diamond films785 nm Raman spectroscopy of CVD diamond films P.W. May , J.A. Smith, K.N. Rosser School is a powerful technique often used to study CVD diamond films, however, very little work has been reported

  12. Strength of Materials, Vol. 46, No. 2, March, 2014 ANALYSIS OF FRACTURE BEHAVIOR OF THIN POLYCRYSTALLINE DIAMOND FILMS

    E-Print Network [OSTI]

    Qin, Qinghua

    POLYCRYSTALLINE DIAMOND FILMS D. S. Li,a,c,1 D. W. Zuo,a,b UDC 539.4 and Q. H. Qinc The effect of the substrate temperature and CH4 concentrations on the fracture behavior of thin polycrystalline diamond films that the fracture behavior of thin polycrystalline diamond films synthesized by direct current plasma jet chemical

  13. Fabrication of quantum point contacts by engraving GaAsAlGaAs heterostructures with a diamond tip

    E-Print Network [OSTI]

    Hohls, Frank

    by hot-filament chemical vapor deposition of polycrystalline diamond onto a prepat- terned siliconFabrication of quantum point contacts by engraving GaAsÕAlGaAs heterostructures with a diamond tip for publication 17 July 2002 We use the all-diamond tip of an atomic force microscope for the direct engraving

  14. Optical properties of polycrystalline diamond films in the far-infrared A. J. Gatesman, R. H. Giles, J. Waldman

    E-Print Network [OSTI]

    Massachusetts at Lowell, University of

    Optical properties of polycrystalline diamond films in the far-infrared A. J. Gatesman, R. H. Giles for the complex refractive index (n - ik) of polycrystalline diamond films grown by microwave plasma enhanced a CO2 optically pumped submillimeter laser. Due to their polycrystalline nature, the diamond films

  15. MetalBosonic InsulatorSuperconductor Transition in Boron-Doped Granular Diamond Gufei Zhang,1,* Monika Zeleznik,2

    E-Print Network [OSTI]

    Bristol, University of

    . Second, the giant RðTÞ peak is observed in heavily boron-doped polycrystalline diamond thick filmsMetal­Bosonic Insulator­Superconductor Transition in Boron-Doped Granular Diamond Gufei Zhang,1 the onset of superconductivity in heavily boron-doped diamond. This anomalous RðTÞ peak in a 3D system

  16. agrotechnical bearing capability: Topics by E-print Network

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

    107 Prediction and measurement of the rotordynamic response of an automotive turbocharger with floating ring bearings Texas A&M University - TxSpace Summary: of lubricant...

  17. Notes 06. Liquid cavitation in fluid film bearings

    E-Print Network [OSTI]

    San Andres, Luis

    2009-01-01T23:59:59.000Z

    NOTES 6. CAVITATION IN LIQUID FILM BEARINGS. Dr. Luis San Andr?s ? 2009 1 NOTES 6. LIQUID CAVITATION IN FLUID FILM BEARINGS Lecture 6 describes the phenomenon of liquid cavitation in steadily loaded fluid film bearings and notes the most... ? Density at Pcav [kg/m 3 ] ? Fluid absolute viscosity [N.s/m 2 ] ? Journal angular speed (rad/s) Subscripts * Inception of the cavitation zone a Ambient value cav Cavitation NOTES 6. CAVITATION IN LIQUID FILM BEARINGS. Dr. Luis San Andr?s ? 2009...

  18. antifriction bearings: Topics by E-print Network

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

    DFIG-based wind turbines. The proposed method uses the first Intrinsic Mode Terms--Wind turbine, Doubly Fed Induction Generator (DFIG), fault detection, bearings, signal...

  19. alternate bearing indices: Topics by E-print Network

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

    Fuels? Alternative Fuels, the Smart Choice: Alternative fuels - biodiesel, electricity, ethanol (E85), natural gas 44 White-etching matter in bearing steel Part 2:...

  20. Passive magnetic bearing element with minimal power losses

    DOE Patents [OSTI]

    Post, Richard F. (Walnut Creek, CA)

    1998-01-01T23:59:59.000Z

    Systems employing passive magnetic bearing elements having minimal power losses are provided. Improved stabilizing elements are shown, employing periodic magnet arrays and inductively loaded circuits, but with improved characteristics compared to the elements disclosed in U.S. Patent No. 5,495,221 entitled "Dynamically Stable Magnetic Suspension/Bearing System." The improvements relate to increasing the magnitude of the force derivative, while at the same time reducing the power dissipated during the normal operation of the bearing system, to provide a passive bearing system that has virtually no losses under equilibrium conditions, that is, when the supported system is not subject to any accelerations except those of gravity.

  1. Investigations of Bearing Failures Associated with White Etching...

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

    of Bearing Failures Associated with White Etching Areas (irWEAs) in Wind Turbine Gearboxes Presented by Bob Errichello of GEARTECH at the Wind Turbine Tribology...

  2. Preliminary relative permeability estimates of methane hydrate-bearing sand

    E-Print Network [OSTI]

    Seol, Yongkoo; Kneafsey, Timothy J.; Tomutsa, Liviu; Moridis, George J.

    2006-01-01T23:59:59.000Z

    gas production from gas hydrate reservoirs. We estimated theof gas production from gas hydrate reservoirs. Fieldpermeability function in gas hydrate-bearing sediments is

  3. High-dynamic-range magnetometry with a single nuclear spin in diamond

    E-Print Network [OSTI]

    Pfeifer, Holger

    High-dynamic-range magnetometry with a single nuclear spin in diamond G. Waldherr1 *, J. Beck1 , P, we implement a quantum phase estimation algorithm6­8 on a single nuclear spin in diamond to combineT). If this priorinformation aboutthemagnetic fieldisnotavailable, estimation of B cannot be performed. To summarize, shorter

  4. REVIEW OF EXPERIMENTS ON ARTIFICIAL CULTURE OF DIAMOND-BACK TERRAPIN 1

    E-Print Network [OSTI]

    REVIEW OF EXPERIMENTS ON ARTIFICIAL CULTURE OF DIAMOND-BACK TERRAPIN 1 By SAMUEL F. HILDEBRAND It is a well-known fact that the diamond-back terrapin (Malll.clemmys) once was plentiful. When this animal a heavy drain, as they do not reproduce rapidly and growth is gained slowly. The natural supply, therefore

  5. Growth of diamond films using an enclosed methyl-acetylene and propadiene combustion flame

    E-Print Network [OSTI]

    Dandy, David

    1 Growth of diamond films using an enclosed methyl-acetylene and propadiene combustion flame K Abstract Diamond growth in low pressure combustion flames was studied using a safer, more economical and chemical kinetic time scales in the combustion reactor. 1 Present Address: 3M Corporation, Bldg. 60-1N-01

  6. Method of bonding diamonds in a matrix and articles thus produced

    DOE Patents [OSTI]

    Taylor, G.W.

    1981-01-27T23:59:59.000Z

    By fluorinating diamond grit, the grit may be readily bonded into a fluorocarbon resin matrix. The matrix is formed by simple hot pressing techniques. Diamond grinding wheels may advantageously be manufactured using such a matrix. Teflon fluorocarbon resins are particularly well suited for using in forming the matrix.

  7. Thermal conductivity changes upon neutron transmutation of {sup 10}B doped diamond

    SciTech Connect (OSTI)

    Jagannadham, K., E-mail: jag-kasichainula@ncsu.edu [Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States); Verghese, K. [Nuclear Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States); Butler, J. E. [Code 6174, Naval research Laboratory, Washington, District of Columbia 20375 (United States)

    2014-08-28T23:59:59.000Z

    {sup 10}B doped p-type diamond samples were subjected to neutron transmutation reaction using thermal neutron flux of 0.9 × 10{sup 13} cm{sup ?2} s{sup ?1} and fast neutron flux of 0.09 × 10{sup 13} cm{sup ?2} s{sup ?1}. Another sample of epilayer grown on type IIa (110) single crystal diamond substrate was subjected to equal thermal and fast neutron flux of 10{sup 14}?cm{sup ?2} s{sup ?1}. The defects in the diamond samples were previously characterized by different methods. In the present work, thermal conductivity of these diamond samples was determined at room temperature by transient thermoreflectance method. The thermal conductivity change in the samples as a function of neutron fluence is explained by the phonon scattering from the point defects and disordered regions. The thermal conductivity of the diamond samples decreased more rapidly initially and less rapidly for larger neutron fluence. In addition, the thermal conductivity in type IIb diamond decreased less rapidly with thermal neutron fluence compared to the decrease in type IIa diamond subjected to fast neutron fluence. It is concluded that the rate of production of defects during transmutation reaction is slower when thermal neutrons are used. The thermal conductivity of epilayer of diamond subjected to high thermal and fast neutron fluence is associated with the covalent carbon network in the composite structure consisting of disordered carbon and sp{sup 2} bonded nanocrystalline regions.

  8. Electronic Structure of Diamond Surfaces Functionalized by Ru(tpy)2 Ioannis Zegkinoglou,,

    E-Print Network [OSTI]

    Himpsel, Franz J.

    by reducing the output voltage by almost a factor of 2.4 For all solar energy conversion processes of the frontier orbitals of the dye relative to the band edges of diamond are inferred from the spectroscopic data. The implications of using diamond films as inert electron donors in photocatalysis and dye-sensitized solar cells

  9. Homoepitaxial Growth of Single Crystal Diamond Membranes for Quantum Information Processing

    E-Print Network [OSTI]

    Igor Aharonovich; Jonathan C. Lee; Andrew P. Magyar; Bob B. Buckley; Christopher G. Yale; David D. Awschalom; Evelyn L. Hu

    2012-01-18T23:59:59.000Z

    Fabrication of devices designed to fully harness the unique properties of quantum mechanics through their coupling to quantum bits (qubits) is a prominent goal in the field of quantum information processing (QIP). Among various qubit candidates, nitrogen vacancy (NV) centers in diamond have recently emerged as an outstanding platform for room temperature QIP. However, formidable challenges still remain in processing diamond and in the fabrication of thin diamond membranes, which are necessary for planar photonic device engineering. Here we demonstrate epitaxial growth of single crystal diamond membranes using a conventional microwave chemical vapor deposition (CVD) technique. The grown membranes, only a few hundred nanometers thick, show bright luminescence, excellent Raman signature and good NV center electronic spin coherence times. Microdisk cavities fabricated from these membranes exhibit quality factors of up to 3000, overlapping with NV center emission. Our methodology offers a scalable approach for diamond device fabrication for photonics, spintronics, optomechanics and sensing applications.

  10. Vacuum encapsulated hermetically sealed diamond amplified cathode capsule and method for making same

    DOE Patents [OSTI]

    Rao, Triveni; Walsh, John; Gangone, Elizabeth

    2014-12-30T23:59:59.000Z

    A vacuum encapsulated, hermetically sealed cathode capsule for generating an electron beam of secondary electrons, which generally includes a cathode element having a primary emission surface adapted to emit primary electrons, an annular insulating spacer, a diamond window element comprising a diamond material and having a secondary emission surface adapted to emit secondary electrons in response to primary electrons impinging on the diamond window element, a first cold-weld ring disposed between the cathode element and the annular insulating spacer and a second cold-weld ring disposed between the annular insulating spacer and the diamond window element. The cathode capsule is formed by a vacuum cold-weld process such that the first cold-weld ring forms a hermetical seal between the cathode element and the annular insulating spacer and the second cold-weld ring forms a hermetical seal between the annular spacer and the diamond window element whereby a vacuum encapsulated chamber is formed within the capsule.

  11. Resonant frequency method for bearing ball inspection

    DOE Patents [OSTI]

    Khuri-Yakub, B.T.; Chungkao Hsieh.

    1993-11-02T23:59:59.000Z

    The present invention provides for an inspection system and method for detecting defects in test objects which includes means for generating expansion inducing energy focused upon the test object at a first location, such expansion being allowed to contract, thereby causing pressure wave within and on the surface of the test object. Such expansion inducing energy may be provided by, for example, a laser beam or ultrasonic energy. At a second location, the amplitudes and phases of the acoustic waves are detected and the resonant frequencies' quality factors are calculated and compared to predetermined quality factor data, such comparison providing information of whether the test object contains a defect. The inspection system and method also includes means for mounting the bearing ball for inspection. 5 figures.

  12. Rare Earth-Bearing Murataite Ceramics

    SciTech Connect (OSTI)

    Stefanovsky, Sergey; Stefanovsky, Olga [SIA Radon, Moscow, 119121 (Russian Federation); Yudintsev, Sergey; Nikonov, Boris [IGEM RAS, Moscow, 119017 (Russian Federation)

    2007-07-01T23:59:59.000Z

    Phase composition of the murataite-based ceramics containing 10 wt.% lanthanum, cerium, neodymium, europium, gadolinium, yttrium, zirconium oxides was studied. The ceramics were prepared by melting of oxide mixtures in 20 mL glass-carbon crucibles in air at {approx}1500 deg. C. They are composed of predominant murataite-type phases and minor extra phases: rutile, crichtonite, perovskite, ilmenite/pyrophanite, and zirconolite (in the Zr-bearing sample only). Three murataite-related phases with five- (5C), eight- (8C), and three-fold (3C) elementary fluorite unit cell are normally present in all the ceramics. These phases form core, intermediate zone, and rim of the murataite grains, respectively. They are predominant host phases for the rare earth elements whose concentrations are reduced in a row: 5C>8C>3C. Appreciate fraction of La and Ce may enter the perovskite phase. (authors)

  13. Method and apparatus for making diamond-like carbon films

    DOE Patents [OSTI]

    Pern, Fu-Jann (Golden, CO); Touryan, Kenell J. (Indian Hills, CO); Panosyan, Zhozef Retevos (Yerevan, AM); Gippius, Aleksey Alekseyevich (Moscow, RU)

    2008-12-02T23:59:59.000Z

    Ion-assisted plasma enhanced deposition of diamond-like carbon (DLC) films on the surface of photovoltaic solar cells is accomplished with a method and apparatus for controlling ion energy. The quality of DLC layers is fine-tuned by a properly biased system of special electrodes and by exact control of the feed gas mixture compositions. Uniform (with degree of non-uniformity of optical parameters less than 5%) large area (more than 110 cm.sup.2) DLC films with optical parameters varied within the given range and with stability against harmful effects of the environment are achieved.

  14. All optical control of a single electron spin in diamond

    E-Print Network [OSTI]

    Yiwen Chu; Matthew Markham; Daniel J. Twitchen; Mikhail D. Lukin

    2014-09-22T23:59:59.000Z

    Precise coherent control of the individual electronic spins associated with atom-like impurities in the solid state is essential for applications in quantum information processing and quantum metrology. We demonstrate all-optical initialization, fast coherent manipulation, and readout of the electronic spin of the negatively charged nitrogen-vacancy (NV$^-$) center in diamond at T$\\sim$7K. We then present the observation of a novel double-dark resonance in the spectroscopy of an individual NV center. These techniques open the door for new applications ranging from robust manipulation of spin states using geometric quantum gates to quantum sensing and information processing.

  15. Refractory two-dimensional hole gas on hydrogenated diamond surface

    SciTech Connect (OSTI)

    Hiraiwa, Atsushi [Institute for Nanoscience and Nanotechnology, Waseda University, 513 Waseda-tsurumaki, Shinjuku, Tokyo 162-0041 (Japan); Daicho, Akira; Kurihara, Shinichiro; Yokoyama, Yuki; Kawarada, Hiroshi [Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555 (Japan)

    2012-12-15T23:59:59.000Z

    Use of two-dimensional hole gas (2DHG), induced on a hydrogenated diamond surface, is a solution to overcoming one of demerits of diamond, i.e., deep energy levels of impurities. This 2DHG is affected by its environment and accordingly needs a passivation film to get a stable device operation especially at high temperature. In response to this requirement, we achieved the high-reliability passivation forming an Al{sub 2}O{sub 3} film on the diamond surface using an atomic-layer-deposition (ALD) method with an H{sub 2}O oxidant at 450 Degree-Sign C. The 2DHG thus protected survived air annealing at 550 Degree-Sign C for an hour, establishing a stable high-temperature operation of 2DHG devices in air. In part, this achievement is based on high stability of C-H bonds up to 870 Degree-Sign C in vacuum and above 450 Degree-Sign C in an H{sub 2}O-containing environment as in the ALD. Chemically, this stability is supported by the fact that both the thermal decomposition of C-H bonds and reaction between C-H bonds and H{sub 2}O are endothermic processes. It makes a stark contrast to the instability of Si-H bonds, which decompose even at room temperature being exposed to atomic hydrogen. In this respect, the diamond 2DHG devices are also promising as power devices expectedly being free from many instability phenomena, such as hot carrier effect and negative-bias temperature instability, associated with Si devices. As to adsorbate, which is the other prerequisite for 2DHG, it desorbed in vacuum below 250 Degree-Sign C, and accordingly some new adsorbates should have adsorbed during the ALD at 450 Degree-Sign C. As a clue to this question, we certainly confirmed that some adsorbates, other than those at room temperature, adsorbed in air above 100 Degree-Sign C and remained at least up to 290 Degree-Sign C. The identification of these adsorbates is open for further investigation.

  16. The reflection of very cold neutrons from diamond powder nanoparticles

    E-Print Network [OSTI]

    V. V. Nesvizhevsky; E. V. Lychagin; A. Yu. Muzychka; A. V. Strelkov; G. Pignol; K. V. Protasov

    2008-05-17T23:59:59.000Z

    We study possibility of efficient reflection of very cold neutrons (VCN) from powders of nanoparticles. In particular, we measured the scattering of VCN at a powder of diamond nanoparticles as a function of powder sample thickness, neutron velocity and scattering angle. We observed extremely intense scattering of VCN even off thin powder samples. This agrees qualitatively with the model of independent nanoparticles at rest. We show that this intense scattering would allow us to use nanoparticle powders very efficiently as the very first reflectors for neutrons with energies within a complete VCN range up to $10^{-4}$ eV.

  17. Blue Diamond, Nevada: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty EditCalifornia: EnergyAvignon,Belcher HomesLyonsBirchBlockVI Jump to:Diamond, Nevada:

  18. Black Diamond, Washington: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:EzfeedflagBiomass ConversionsSouthby 2022 | OpenEIBixby, Oklahoma: EnergyBlack Diamond

  19. Anthropogenic Impacts on Polar Bear Biology and the Arctic Ecosystem.

    E-Print Network [OSTI]

    Jordan, John E.

    2013-12-16T23:59:59.000Z

    decreasing in an easterly direction. In polar bears, mercury is known to damage internal organs, the neurological system, and the endocrine system. Climate change is already impacting polar bears due to changes in sea ice and other factors and these effects...

  20. Synoptic Observing Programs at Big Bear Solar Observatory

    E-Print Network [OSTI]

    Solar Observatory in China, and will explore collaboration with observatories in Canary Island to extendSynoptic Observing Programs at Big Bear Solar Observatory Haimin Wang and Philip R. Goode Big Bear Solar Observatory, New Jersey Institute of Technology, Newark, NJ 07102, USA Abstract. New Jersey

  1. ELECTROSTATICALLY DRIVEN ROTOR ON CONDUCTIVE LIQUID RING BEARINGS

    E-Print Network [OSTI]

    avoid dry friction, eliminate wear and enhance reliability; compared with gas bearing [7], liquid]. However, the solid-solid friction, large in microscale, requires high voltage or large current to overcome the friction and often causes serious wear [6]. Gas or air bearing [7], created through electrostatic

  2. Permanent magnet design for high-speed superconducting bearings

    DOE Patents [OSTI]

    Hull, J.R.; Uherka, K.L.; Abdoud, R.G.

    1996-09-10T23:59:59.000Z

    A high temperature superconducting bearing including a permanent magnet rotor levitated by a high temperature superconducting structure is disclosed. The rotor preferably includes one or more concentric permanent magnet rings coupled to permanent magnet ring structures having substantially triangular and quadrangular cross-sections. Both alternating and single direction polarity magnet structures can be used in the bearing. 9 figs.

  3. High temperature, permanent magnet biased, homopolar magnetic bearing actuator

    E-Print Network [OSTI]

    Hossain, Mohammad Ahsan

    2006-10-30T23:59:59.000Z

    .............................. 31 5.3 Mold Design for Bearing Stator......................................................... 32 5.4 Molding Process................................................................................. 34 5.5 Assembly of Bearing.......................................................... 34 Figure 5.6 The Assembly Process of Stator in Back Iron with Special Tool...... 35 Figure 5.7 The Assembly Process of Test Rig.................................................... 36 Figure 5.8 The Test Rig at Operating Condition...

  4. Permanent magnet design for high-speed superconducting bearings

    DOE Patents [OSTI]

    Hull, John R. (5519 S. Bruner, Hinsdale, IL 60521); Uherka, Kenneth L. (830 Ironwood, Frankfort, IL 60423); Abdoud, Robert G. (13 Country Oaks La., Barrington Hills, IL 60010)

    1996-01-01T23:59:59.000Z

    A high temperature superconducting bearing including a permanent magnet rotor levitated by a high temperature superconducting structure. The rotor preferably includes one or more concentric permanent magnet rings coupled to permanent magnet ring structures having substantially triangular and quadrangular cross-sections. Both alternating and single direction polarity magnet structures can be used in the bearing.

  5. Optical properties of chemical-vapor-deposited diamond films

    SciTech Connect (OSTI)

    Bi, X.X.; Eklund, P.C.; Zhang, J.G.; Rao, A.M. (Department of Physics and Astronomy, University of Kentucky, Lexington, KY (USA)); Perry, T.A.; Beetz, C.P. Jr. (Physics Department, General Motors Research Laboratory, Warren, MI (USA))

    1990-04-01T23:59:59.000Z

    Results of room-temperature optical studies on {similar to}10 micron thick, free-standing diamond films are reported. The films were grown on Si(100) substrates by hot filament-assisted chemical vapor deposition (CVD) from a methane/hydrogen mixture. The as-grown, free surface of the films exhibited a surface roughness of scale {sigma}{similar to}0.2 to 5 microns, depending on the methane/hydrogen mixture, which introduces significant optical scattering loss for frequencies greater than 0.5 eV. Specular reflection and transmission spectra in the range 0.01--10 eV were collected. Below the threshold for interband adsorption near {similar to}5 eV, the films studied behaved approximately as thin parallel plates of refractive index 2.4, with the rough free surface leading to increasingly larger loss of specular transmission/reflection with decreasing wavelength. Structure in the mid-infrared transmission spectra was observed and attributed to disorder-induced one-phonon absorption, intrinsic multi-phonon absorption, and infrared active --C--H{sub 2} stretching modes. The strength of the C--H band was observed to increase with increasing methane pressure in the growth chamber. At 5.3 eV, the onset of interband absorption was observed, in good agreement with the value of the indirect bandgap in type IIa (intrinsic) diamond.

  6. Methane Recovery from Hydrate-bearing Sediments

    SciTech Connect (OSTI)

    J. Carlos Santamarina; Costas Tsouris

    2011-04-30T23:59:59.000Z

    Gas hydrates are crystalline compounds made of gas and water molecules. Methane hydrates are found in marine sediments and permafrost regions; extensive amounts of methane are trapped in the form of hydrates. Methane hydrate can be an energy resource, contribute to global warming, or cause seafloor instability. This study placed emphasis on gas recovery from hydrate bearing sediments and related phenomena. The unique behavior of hydrate-bearing sediments required the development of special research tools, including new numerical algorithms (tube- and pore-network models) and experimental devices (high pressure chambers and micromodels). Therefore, the research methodology combined experimental studies, particle-scale numerical simulations, and macro-scale analyses of coupled processes. Research conducted as part of this project started with hydrate formation in sediment pores and extended to production methods and emergent phenomena. In particular, the scope of the work addressed: (1) hydrate formation and growth in pores, the assessment of formation rate, tensile/adhesive strength and their impact on sediment-scale properties, including volume change during hydrate formation and dissociation; (2) the effect of physical properties such as gas solubility, salinity, pore size, and mixed gas conditions on hydrate formation and dissociation, and it implications such as oscillatory transient hydrate formation, dissolution within the hydrate stability field, initial hydrate lens formation, and phase boundary changes in real field situations; (3) fluid conductivity in relation to pore size distribution and spatial correlation and the emergence of phenomena such as flow focusing; (4) mixed fluid flow, with special emphasis on differences between invading gas and nucleating gas, implications on relative gas conductivity for reservoir simulations, and gas recovery efficiency; (5) identification of advantages and limitations in different gas production strategies with emphasis; (6) detailed study of CH4-CO2 exchange as a unique alternative to recover CH4 gas while sequestering CO2; (7) the relevance of fines in otherwise clean sand sediments on gas recovery and related phenomena such as fines migration and clogging, vuggy structure formation, and gas-driven fracture formation during gas production by depressurization.

  7. Experimental identification of structural force coefficients in a bump-type foil bearing

    E-Print Network [OSTI]

    Breedlove, Anthony Wayne

    2009-06-02T23:59:59.000Z

    temperature applications. During actual operation with shaft rotation, the bearing structural parameters are coupled to the effects of a hydrodynamic gas film layer, thus determining the overall bearing load performance. A 38.17 mm inner diameter foil bearing...

  8. Lift-off performance in flexure pivot pad and hybrid bearings

    E-Print Network [OSTI]

    Mertz, David Hunter

    2009-05-15T23:59:59.000Z

    Three flexure pivot pad bearings (FPBs) with different preloads are evaluated for use in high performance applications by comparing them to a hybrid hydrostatic bearing (HHB). One application of these bearings is in turbopumps for liquid rocket...

  9. One and two-dimensional finite difference models of pore pressure evolution within and below a moving thrust sheet 

    E-Print Network [OSTI]

    Smith, Richard Edwin

    1992-01-01T23:59:59.000Z

    Chatanooga Shale through the Cambrian Pumpkin Valley Shale were measured within the Copper Ridge thrust sheet on cross section A-A' of the Swan Island Quadrangle. Again, the Rome Formation forms the basal detachment zone and is not completely exposed... contain a variety of ancient, hydrologically and mechanically different, well consolidated sedimentary layers including shales, siltstones, sandstones, carbonates and evaporites. In addition, the models cited above were made for specific accretionary...

  10. One and two-dimensional finite difference models of pore pressure evolution within and below a moving thrust sheet

    E-Print Network [OSTI]

    Smith, Richard Edwin

    1992-01-01T23:59:59.000Z

    Chatanooga Shale through the Cambrian Pumpkin Valley Shale were measured within the Copper Ridge thrust sheet on cross section A-A' of the Swan Island Quadrangle. Again, the Rome Formation forms the basal detachment zone and is not completely exposed... contain a variety of ancient, hydrologically and mechanically different, well consolidated sedimentary layers including shales, siltstones, sandstones, carbonates and evaporites. In addition, the models cited above were made for specific accretionary...

  11. Increasing the creation yield of shallow single defects in diamond by surface plasma treatment

    SciTech Connect (OSTI)

    Osterkamp, Christian; Scharpf, Jochen; Naydenov, Boris; Jelezko, Fedor [Institut für Quantenoptik, Ulm University, Albert Einstein Allee 11, Ulm 89081 (Germany)] [Institut für Quantenoptik, Ulm University, Albert Einstein Allee 11, Ulm 89081 (Germany); Pezzagna, Sebastien; Meijer, Jan [Institut für Experimentelle Physik II, Abteilung Nukleare Festkörperphysik, Universität Leipzig, Linnestraße 5, Leipzig 04103 (Germany)] [Institut für Experimentelle Physik II, Abteilung Nukleare Festkörperphysik, Universität Leipzig, Linnestraße 5, Leipzig 04103 (Germany); Diemant, Thomas; Jürgen Behm, Rolf [Institut für Oberflächenchemie und Katalyse, Ulm University, Albert-Einstein-Allee 47, Ulm 89081 (Germany)] [Institut für Oberflächenchemie und Katalyse, Ulm University, Albert-Einstein-Allee 47, Ulm 89081 (Germany)

    2013-11-04T23:59:59.000Z

    Single Nitrogen-Vacancy (NV) centers in diamond close to the crystal surface are very promising magnetic field sensors with very high sensitivity. Here, we report the enhanced creation of very shallow (less than 3 nm below the diamond surface) NV centers by using fluorine and oxygen plasma treatment. We observe a four fold increase—from 0.11% to about 0.45% in the production yield when the sample surface is terminated with fluorine or oxygen atoms. This effect is explained by the stabilization of the NV's negative charge state which is influenced by the various defects present on the diamond surface.

  12. Plasma etching of cavities into diamond anvils for experiments at high pressures and high temperatures

    SciTech Connect (OSTI)

    Weir, S.T.; Cynn, H.; Falabella, S.; Evans, W.J.; Aracne-Ruddle, C.; Farber, D.; Vohra, Y.K. (LLNL); (UAB)

    2012-10-23T23:59:59.000Z

    We describe a method for precisely etching small cavities into the culets of diamond anvils for the purpose of providing thermal insulation for samples in experiments at high pressures and high temperatures. The cavities were fabricated using highly directional oxygen plasma to reactively etch into the diamond surface. The lateral extent of the etch was precisely controlled to micron accuracy by etching the diamond through a lithographically fabricated tungsten mask. The performance of the etched cavities in high-temperature experiments in which the samples were either laser heated or electrically heated is discussed.

  13. Long coherence time of spin qubits in $^{12}$C enriched polycrystalline CVD diamond

    E-Print Network [OSTI]

    K. D. Jahnke; B. Naydenov; T. Teraji; S. Koizumi; T. Umeda; J. Isoya; F. Jelezko

    2012-06-19T23:59:59.000Z

    Single defects in diamond and especially negatively charged nitrogen vacancy (NV) centers are very promising quantum systems with wide applications in physics and biology. It was shown that their coherence properties can be strongly improved by growing ultrapure diamond with low concentration of parasitic spins associated with nitrogen electron spins and nuclear spins related to $^{13}$C carbon isotope. Here we report a high quality $^{12}$C-enriched polycrystalline CVD diamond material with properties comparable with single crystals. We find single NVs in the grains of this material, which show extremely long electron spin coherence time $T_2 > 2\\,ms$.

  14. Diamondization of Graphene and Graphene-BN Bilayers: Chemical Functionalization and Electronic Structure Engineering

    E-Print Network [OSTI]

    Yuan, Long; Yang, Jinlong; Hou, Jian Guo

    2011-01-01T23:59:59.000Z

    In this article, based on first-principles calculations, we systematically study functionalization induced diamonization of graphene bilayer and graphene-BN hybrid bilayer. With single-side functionalization, the diamondized structures are magnetic semiconductor. Interestingly, if both sides of the bilayer are functionalized, diamondization becomes spontaneous without a barrier. On the other hand, when the bottom layer of the bilayer graphene is replaced by a single hexagonal BN layer, the diamondized structure becomes nonmagnetic metal. The tunable electronic and magnetic properties pave new avenues to construct graphene-based electronics and spintronics devices.

  15. Accelerated Weathering of High-Level and Plutonium-bearing Lanthanide...

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

    Weathering of High-Level and Plutonium-bearing Lanthanide Borosilicate Waste Glasses under Hydraulically Unsaturated Accelerated Weathering of High-Level and Plutonium-bearing...

  16. Paramont's Black Bear No. 4 mine does it right, again

    SciTech Connect (OSTI)

    Sanda, A.

    2007-07-15T23:59:59.000Z

    The Paramont Coal Company Virginia, LLC, a subsidiary of Alpha Natural Resources, recently won the '2007 overall award for excellence in mining and reclamation from the Virginia Division of Mined Land Reclamation and the Virginia Mining Association. Coal People Magazine recently visited Black Bear No. 4 mine where a settling pond was being removed and stream bed placed to drain the area, part of the 451-acre award winning reclamation project. The article recounts discussions with mining engineers about the company's operations with emphasis on the Black Bear No. 4 mine. Black Bear No. 1 mine won five state and national awards last year for conservation and land management practices. 8 photos.

  17. Reactive ion etching: Optimized diamond membrane fabrication for transmission electron microscopy

    E-Print Network [OSTI]

    Li, Luozhou

    Commonly used preparation method for thin diamond membranes by focused ion beam (FIB) techniques results in surface damage. Here, the authors introduce an alternative method based on reactive ion etching (RIE). To compare ...

  18. Core-Shell Diamond as a Support for Solid-Phase Extraction and...

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

    a Support for Solid-Phase Extraction and High-Performance Liquid Chromatography. Core-Shell Diamond as a Support for Solid-Phase Extraction and High-Performance Liquid...

  19. Homoepitaxial Growth of Single Crystal Diamond Membranes for Quantum Information Processing

    E-Print Network [OSTI]

    Aharonovich, Igor; Magyar, Andrew P; Buckley, Bob B; Yale, Christopher G; Awschalom, David D; Hu, Evelyn L

    2011-01-01T23:59:59.000Z

    Fabrication of devices designed to fully harness the unique properties of quantum mechanics through their coupling to quantum bits (qubits) is a prominent goal in the field of quantum information processing (QIP). Among various qubit candidates, nitrogen vacancy (NV) centers in diamond have recently emerged as an outstanding platform for room temperature QIP. However, formidable challenges still remain in processing diamond and in the fabrication of thin diamond membranes, which are necessary for planar photonic device engineering. Here we demonstrate epitaxial growth of single crystal diamond membranes using a conventional microwave chemical vapor deposition (CVD) technique. The grown membranes, only a few hundred nanometers thick, show bright luminescence, excellent Raman signature and good NV center electronic spin coherence times. Microdisk cavities fabricated from these membranes exhibit quality factors of up to 3000, overlapping with NV center emission. Our methodology offers a scalable approach for dia...

  20. Examination of the Material Removal Rate in Lapping Polycrystalline Diamond Compacts

    E-Print Network [OSTI]

    Sowers, Jason Michael

    2012-10-19T23:59:59.000Z

    This study examines the lapping machining process used during the manufacturing of polycrystalline diamond compacts (PDCs). More specifically, it is aimed at improving the productivity of the process by developing a better understanding...

  1. Development and analysis of a flexible signal phasing strategy for diamond interchange control

    E-Print Network [OSTI]

    Krueger, Gregory David

    1995-01-01T23:59:59.000Z

    There are many signal timing strategies for diamond interchanges. Due to the different geometric and traffic conditions, however, none of the available strategies is always optimal. The two most widely used strategies, three-phase, and four...

  2. Evaluation of traffic operations at diamond interchanges using advanced actuated control

    E-Print Network [OSTI]

    Koonce, Peter John Vincent

    1998-01-01T23:59:59.000Z

    This thesis documents an operational analysis of ographics. advanced actuated traffic control at signalized diamond interchanges. The study attempts to determine the benefits a "flexible'' phasing strategy provides to the interchange. Flexible...

  3. Diamond thin films: a 21st-century material By Paul W. May

    E-Print Network [OSTI]

    Bristol, University of

    in Kimberley, South Africa, creating a huge rush of European prospectors. The wealth this created helped between them at room temperature and pressure. Ironically, this large energy barrier, which makes diamond

  4. Optically transparent, scratch-resistant, diamond-like carbon coatings

    DOE Patents [OSTI]

    He, Xiao-Ming; Lee, Deok-Hyung; Nastasi, Michael A.; Walter, Kevin C.; Tuszewski, Michel G.

    2003-06-03T23:59:59.000Z

    A plasma-based method for the deposition of diamond-like carbon (DLC) coatings is described. The process uses a radio-frequency inductively coupled discharge to generate a plasma at relatively low gas pressures. The deposition process is environmentally friendly and scaleable to large areas, and components that have geometrically complicated surfaces can be processed. The method has been used to deposit adherent 100-400 nm thick DLC coatings on metals, glass, and polymers. These coatings are between three and four times harder than steel and are therefore scratch resistant, and transparent to visible light. Boron and silicon doping of the DLC coatings have produced coatings having improved optical properties and lower coating stress levels, but with slightly lower hardness.

  5. Persistence of Single Spin Coherence above 600K in Diamond

    E-Print Network [OSTI]

    Toyli, D M; Alkauskas, A; Buckley, B B; Van de Walle, C G; Awschalom, D D

    2012-01-01T23:59:59.000Z

    We study the spin and orbital dynamics of single nitrogen vacancy (NV) centers in diamond between room temperature and 700 K. We find that the ability to optically address and coherently control single spins above room temperature is limited by nonradiative processes that quench the NV center's fluorescence-based spin readout between 550 K and 700 K. Combined with electronic structure calculations, our measurements indicate that the energy difference between the 3E and 1A1 electronic states is approximately 0.8 eV. We also find that the inhomogeneous spin lifetime (T2*) is independent of temperature up to at least 625 K, suggesting that single NV centers could be applied as nanoscale thermometers over a broad temperature range.

  6. The Discrete Geometry of a Small Causal Diamond

    E-Print Network [OSTI]

    Mriganko Roy; Debdeep Sinha; Sumati Surya

    2012-12-04T23:59:59.000Z

    We study the discrete causal set geometry of a small causal diamond in a curved spacetime using the average abundance of k-element chains or total orders in the underlying causal set C. We begin by obtaining the first order curvature corrections to the flat spacetime expression for the abundance using Riemann normal coordinates. For fixed spacetime dimension this allows us to find a new expression for the discrete scalar curvature of C as well as the time-time component of its Ricci tensor in terms of the abundances of k-chains. We also find a new dimension estimator for C which replaces the flat spacetime Myrheim-Meyer estimator in generic curved spacetimes.

  7. Study of narrowband single photon emitters in polycrystalline diamond films

    SciTech Connect (OSTI)

    Sandstrom, Russell G.; Shimoni, Olga; Martin, Aiden A.; Aharonovich, Igor, E-mail: igor.aharonovich@uts.edu.au [School of Physics and Advanced Materials, University of Technology, Sydney, P.O. Box 123, Broadway, New South Wales 2007 (Australia)

    2014-11-03T23:59:59.000Z

    Quantum information processing and integrated nanophotonics require robust generation of single photon emitters on demand. In this work, we demonstrate that diamond films grown on a silicon substrate by microwave plasma chemical vapor deposition can host bright, narrowband single photon emitters in the visible—near infra-red spectral range. The emitters possess fast lifetime (?several ns), absolute photostability, and exhibit full polarization at excitation and emission. Pulsed and continuous laser excitations confirm their quantum behaviour at room temperature, while low temperature spectroscopy is performed to investigate inhomogeneous broadening. Our results advance the knowledge of solid state single photon sources and open pathways for their practical implementation in quantum communication and quantum information processing.

  8. aerostatic journal bearing: Topics by E-print Network

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

    - TxSpace Summary: condition or Swift-Stieber model) at the leading edge of the cavitation zone are: M x Full film zone dPdx < 0 ?R journal bearing x Cavitation zone x 1...

  9. ab1157 strains bearing: Topics by E-print Network

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

    anchor bolts. To this end, a new bearing system, referred to as a... Tsai, Yi-Te 2010-10-12 133 Synchronous Thermal Instability Evaluation of Medium Speed Turbocharger...

  10. Circular sensor array and nonlinear analysis of homopolar magnetic bearings 

    E-Print Network [OSTI]

    Wiesenborn, Robert Kyle

    2007-04-25T23:59:59.000Z

    Magnetic bearings use variable attractive forces generated by electromagnetic control coils to support rotating shafts with low friction and no material wear while providing variable stiffness and damping. Rotor deflections are stabilized...

  11. Rotordynamic evaluation of a roughened-land hybrid bearing

    E-Print Network [OSTI]

    Fayolle, Patrice Gerard

    1997-01-01T23:59:59.000Z

    " seals. This thesis presents experimental as well as theoretical static and dynamic results for a five-pocket orifice-compensated hole-pattern-land hybrid bearing. Experimental data show a significant improvement in stability compared to a smooth hybrid...

  12. Field Examples of Axial Cracked Bearings in Wind Turbine Gearboxes...

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

    Field Examples of Axial Cracked Bearings in Wind Turbine Gearboxes Presented by Paul John Baker of FrontierPro Services at the Wind Turbine Tribology Seminar 2014. 141030 Axial...

  13. Cooling system for a bearing of a turbine rotor

    DOE Patents [OSTI]

    Schmidt, Mark Christopher (Niskayuna, NY)

    2002-01-01T23:59:59.000Z

    In a gas turbine, a bore tube assembly radially inwardly of an aft bearing conveys cooling steam to the buckets of the turbine and returns the cooling steam to a return. To cool the bearing and thermally insulate the bearing from the cooling steam paths, a radiation shield is spaced from the bore tube assembly by a dead air gap. Additionally, an air passageway is provided between the radiation shield and the inner surface of an aft shaft forming part of the rotor. Air is supplied from an inlet for flow along the passage and radially outwardly through bores in the aft shaft disk to cool the bearing and insulate it from transfer of heat from the cooling steam.

  14. The effects of diamond injector angles on flow structures at various Mach numbers

    E-Print Network [OSTI]

    McLellan, Justin Walter

    2006-10-30T23:59:59.000Z

    THE EFFECTS OF DIAMOND INJECTOR ANGLES ON FLOW STRUCTURES AT VARIOUS MACH NUMBERS A Thesis by JUSTIN WALTER MCLELLAN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE August 2005 Major Subject: Aerospace Engineering THE EFFECTS OF DIAMOND INJECTOR ANGLES ON FLOW STRUCTURES AT VARIOUS MACH NUMBERS A Thesis by JUSTIN WALTER...

  15. Notes 14. Experimental identification of bearing force coefficients

    E-Print Network [OSTI]

    San Andres, Luis

    2009-01-01T23:59:59.000Z

    An example of system parameter identification (Hybrid Brush Seal) Luis San Andr?s (lecturer) Thanks to Adolfo Delgado, Jos? Baker (RAs) & support from Siemens Power Generation MEEN 617 - April 2008 Structural parameters K shaft = 243 lbf/in (42...Notes 14. IDENTIFICATION OF BEARING FORCE COEFFICIENTS. ? Dr. Luis San Andr?s (2009) 1 Handout # 14 (MEEN 626) Application example Experimental identification of bearing force coefficients Experimental identification of the dynamic force...

  16. Ecological effects of contaminants and remedial actions in Bear Creek

    SciTech Connect (OSTI)

    Southworth, G.R.; Loar, J.M.; Ryon, M.G.; Smith, J.G.; Stewart, A.J. (Oak Ridge National Lab., TN (United States)); Burris, J.A. (C. E. Environmental, Inc., Tallahassee, FL (United States))

    1992-01-01T23:59:59.000Z

    Ecological studies of the Bear Creek watershed, which drains the area surrounding several Oak Ridge Y-12 Plant waste disposal facilities, were initiated in May 1984 and are continuing at present. These studies consisted of an initial, detailed characterization of the benthic invertebrate and fish communities in Bear Creek, and they were followed by a presently ongoing monitoring phase that involves reduced sampling intensities. The characterization phase utilized two approaches: (1) instream sampling of benthic invertebrate and fish communities in Bear Creek to identify spatial and temporal patterns in distribution and abundance and (2) laboratory bioassays on water samples from Bear Creek and selected tributaries to identify potential sources of toxicity to biota. The monitoring phase of the ecological program relates to the long-term goals of identifying and prioritizing contaminant sources and assessing the effectiveness of remedial actions. It continues activities of the characterization phase at less frequent intervals. The Bear Greek Valley is a watershed that drains the area surrounding several closed Oak Ridge Y-12 Plant waste disposal facilities. Past waste disposal practices in Bear Creek Valley resulted in contamination of Bear Creek and consequent ecological damage. Extensive remedial actions have been proposed at waste sites, and some of the have been implemented or are now underway. The proposed study plan consists of an initial, detailed characterization of the benthic invertebrate and fish communities in Bear Creek in the first year followed by a reduction in sampling intensity during the monitoring phase of the plan. The results of sampling conducted from May 1984 through early 1989 are presented in this report.

  17. Cryocooler applications for high-temperature superconductor magnetic bearings.

    SciTech Connect (OSTI)

    Niemann, R. C.

    1998-05-22T23:59:59.000Z

    The efficiency and stability of rotational magnetic suspension systems are enhanced by the use of high-temperature superconductor (HTS) magnetic bearings. Fundamental aspects of the HTS magnetic bearings and rotational magnetic suspension are presented. HTS cooling can be by liquid cryogen bath immersion or by direct conduction, and thus there are various applications and integration issues for cryocoolers. Among the numerous cryocooler aspects to be considered are installation; operating temperature; losses; and vacuum pumping.

  18. High performance magnetic bearing systems using high temperature superconductors

    DOE Patents [OSTI]

    Abboud, Robert G. (Barrington Hills, IL)

    1998-01-01T23:59:59.000Z

    A magnetic bearing apparatus and a method for providing at least one stabilizing force in a magnetic bearing structure with a superconducting magnetic assembly and a magnetic assembly, by providing a superconducting magnetic member in the superconducting magnetic assembly with a plurality of domains and arranging said superconducting magnetic member such that at least one domain has a domain C-axis vector alignment angularly disposed relative to a reference axis of the magnetic member in the magnetic assembly.

  19. High performance magnetic bearing systems using high temperature superconductors

    DOE Patents [OSTI]

    Abboud, R.G.

    1998-05-05T23:59:59.000Z

    Disclosed are a magnetic bearing apparatus and a method for providing at least one stabilizing force in a magnetic bearing structure with a superconducting magnetic assembly and a magnetic assembly, by providing a superconducting magnetic member in the superconducting magnetic assembly with a plurality of domains and arranging said superconducting magnetic member such that at least one domain has a domain C-axis vector alignment angularly disposed relative to a reference axis of the magnetic member in the magnetic assembly. 7 figs.

  20. hal-00761492,version1-5Dec2012 Author manuscript, published in "Diamond and Related Materials 17 (2008) 1324" DOI : 10.1016/j.diamond.2008.01.090

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    2008-01-01T23:59:59.000Z

    the n-type phosphorus-doped polycrystalline diamond films PN04 (grain size: 1m), PN11 (grain size: 3m-00761492,version1-5Dec2012 Author manuscript, published in "Diamond and Related Materials 17 (2008) 1324" DOI : 10.1016/j.diamond.2008.01.090 #12;1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

  1. Development of Single Crystal Chemical Vapor Deposition Diamonds for Detector Applications

    SciTech Connect (OSTI)

    Kagan, Harris; Kass, Richard; Gan, K.K.

    2014-01-23T23:59:59.000Z

    With the LHC upgrades in 2013, and further LHC upgrades scheduled in 2018, most LHC experiments are planning for detector upgrades which require more radiation hard technologies than presently available. At present all LHC experiments now have some form of diamond detector. As a result Chemical Vapor Deposition (CVD) diamond has now been used extensively in beam conditions monitors as the innermost detectors in the highest radiation areas of all LHC experiments. Moreover CVD diamond is now being discussed as an alternative sensor material for tracking very close to the interaction region of the HL-LHC where the most extreme radiation conditions will exist. Our work addressed the further development of the new material, single-crystal Chemical Vapor Deposition diamond, towards reliable industrial production of large pieces and new geometries needed for detector applications. Our accomplishments include: • Developed a two U.S.companies to produce electronic grade diamond, • Worked with companies and acquired large area diamond pieces, • Performed radiation hardness tests using various proton energies: 70 MeV (Cyric, Japan), 800 MeV (Los Alamos), and 24 GeV (CERN).

  2. Bear Head LNG Corporation and Bear Head LNG (USA), LLC- FE Dkt. No.- 15-33-LNG

    Broader source: Energy.gov [DOE]

    The Office of Fossil Energy gives notice of receipt of an application filed on February 25, 2015, by Bear Head LNG, requesting long-term multi-contract authority as further described in their...

  3. Static and dynamic characteristics for a two-axial-groove bearing and a pressure-dam bearing

    E-Print Network [OSTI]

    Al Jughaiman, Bader K.

    2009-06-02T23:59:59.000Z

    angle ? s Step angle ? Pad arc angle ? Rotor speed (rad/s) ? Excitation frequency (rad/s) ? n Rotor-bearing system natural frequency (rad/s) ? f Rotor whirling frequency (rad/s) ? h Horizontal preset of orthogonally displaced pressure...]...........................................................3 Fig. 3 Tilting pad bearing a) rocket pivot b) flexure pivot [5] ...........................................4 Fig. 4 Test rig main section..............................................................................................13 Fig. 5 Shaker...

  4. ME 379M Lubrication, Wear, and Bearing Technology ABET EC2000 syllabus

    E-Print Network [OSTI]

    Ben-Yakar, Adela

    . Contact & Contact Mechanics 8. Friction, Wear & Third Bodies 9. Dry Friction & Wear 10. Roller Bearings

  5. DARKNESS, TWILIGHT, AND DAYLIGHT FORAGING SUCCESS OF BEARS (URSUS AMERICANUS) ON SALMON

    E-Print Network [OSTI]

    Reimchen, Thomas E.

    DARKNESS, TWILIGHT, AND DAYLIGHT FORAGING SUCCESS OF BEARS (URSUS AMERICANUS) ON SALMON IN COASTAL (2000­2002). Bears (maximum 7 simultaneously) were primarily active during daylight near the onset with other bears (4%). Scavenging was greatest during daylight (19%) and lowest during darkness (3%). Bears

  6. A comparative study of the conventional diamond and cloverleaf interchanges with respect to ramp capacity and vehicular delay

    E-Print Network [OSTI]

    Barnett, James David

    1963-01-01T23:59:59.000Z

    Volume. . 37 14 Eeighted Aver' ?. . e Tr; rcl Ti!ae Curve for Inside Lane or Left Turn Pueues. 40 15 Diamond Rarup Dcl-y Curves. 16 Cloverleaf H=mi Travel Thee Curves. 45 17 Plot cf Diamond -nd Cloverle-f Ramp Capacity Curves. . Comparison of Dia... indicating specific ;- rrcnts 2. V rrant A certain tr )ffic rolumn 0 Intersection cf tvc h'gh type road;; ys All urban ctree ccnnc ticn: (diamond) d. Cross road vrth less than 3000 vpd (diamond) o e. Cross road must have high s-eed o. )er. bien...

  7. Focused-ion-beam overlay-patterning of three-dimensional diamond structures for advanced single-photon properties

    SciTech Connect (OSTI)

    Jiang, Qianqing; Liu, Dongqi; Liu, Gangqin; Chang, Yanchun; Li, Wuxia, E-mail: liwuxia@aphy.iphy.ac.cn, E-mail: czgu@aphy.iphy.ac.cn [Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Pan, Xinyu; Gu, Changzhi, E-mail: liwuxia@aphy.iphy.ac.cn, E-mail: czgu@aphy.iphy.ac.cn [Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Collaborative Innovation Center of Quantum Matter, Beijing 100190 (China)

    2014-07-28T23:59:59.000Z

    Sources of single photons are of fundamental importance in many applications as to provide quantum states for quantum communication and quantum information processing. Color centers in diamond are prominent candidates to generate and manipulate quantum states of light, even at room temperature. However, the efficiency of photon collection of the color centers in bulk diamond is greatly reduced by refraction at the diamond/air interface. To address this issue, diamond structuring has been investigated by various methods. Among them, focused-ion-beam (FIB) direct patterning has been recognized as the most favorable technique. But it has been noted that diamond tends to present significant challenges in FIB milling, e.g., the susceptibility of forming charging related artifacts and topographical features. In this work, periodically-positioned-rings and overlay patterning with stagger-superimposed-rings were proposed to alleviate some problems encountered in FIB milling of diamond, for improved surface morphology and shape control. Cross-scale network and uniform nanostructure arrays have been achieved in single crystalline diamond substrates. High quality diamond solid immersion lens and nanopillars were sculptured with a nitrogen-vacancy center buried at the desired position. Compared with the film counterpart, an enhancement of about ten folds in single photon collection efficiency was achieved with greatly improved signal to noise ratio. All these results indicate that FIB milling through over-lay patterning could be an effective approach to fabricate diamond structures, potentially for quantum information studies.

  8. Diamond and Related Materials, 3 (1994) 783-786 783 Comparison of two models of thin diamond film microhardness data to

    E-Print Network [OSTI]

    Bristol, University of

    1994-01-01T23:59:59.000Z

    of Aerospace Engineering, University of Bristol, Queen's Building, University Walk, Bristol, BS8 1TR ( UK) Paul of diamond films (1-3 ~tm thick) on silicon and on a titanium alloy is reported. The measured hardness for the silicon and titanium alloy substrates respectively. There is a large titanium carbide interfacial layer

  9. Levitation pressure and friction losses in superconducting bearings

    DOE Patents [OSTI]

    Hull, John R. (Downers Grove, IL)

    2001-01-01T23:59:59.000Z

    A superconducting bearing having at least one permanent magnet magnetized with a vertical polarization. The lower or stator portion of the bearing includes an array of high-temperature superconducting elements which are comprised of a plurality of annular rings. An annular ring is located below each permanent magnet and an annular ring is offset horizontally from at least one of the permanent magnets. The rings are composed of individual high-temperature superconducting elements located circumferentially along the ring. By constructing the horizontally-offset high-temperature superconducting ring so that the c-axis is oriented in a radial direction, a higher levitation force can be achieved. Such an orientation will also provide substantially lower rotational drag losses in the bearing.

  10. Diamond-anvil high-pressure cell with improved X-ray collimation system

    DOE Patents [OSTI]

    Schiferl, David (Los Alamos, NM); Olinger, Barton W. (Santa Fe, NM); Livingston, Robert W. (Los Alamos, NM)

    1986-01-01T23:59:59.000Z

    An adjustable X-ray collimation system for a diamond-anvil high-pressure cell of the type including a cooperable piston and cylinder and a pair of opposing diamonds located between the head of the piston and the head of the cylinder. The X-ray collimation system includes a tubular insert which contains an X-ray collimator. The insert is engageable in the bore of the piston. The collimator is mounted within the insert by means of an elastomeric O-ring at the end closest the opposed diamonds, and by means of a set of adjustable set screws at the opposite end. By adjustment of the set screws the collimator can be pivoted about the O-ring and brought into alignment with the opposed diamonds and the sample contained therein. In the preferred embodiment there is further provided a set of plugs which are insertable in the bore of the collimator. The plugs have bores of different diameters. By successively inserting plugs of progressively smaller bore diameters and adjusting the alignment of the collimator with each plug, the collimator can be quickly brought into accurate alignment with the diamonds. The collimation system allows alignment of the collimator either before or after the cell has been loaded and pressurized.

  11. Diamond-anvil high-pressure cell with improved x-ray collimation system

    DOE Patents [OSTI]

    Schiferl, D.; Olinger, B.W.; Livingston, R.W.

    1984-03-30T23:59:59.000Z

    An adjustable x-ray collimation system for a diamond-anvil high-pressure cell of the type including a cooperable piston and cylinder and a pair of opposing diamonds located between the head of the piston and the head of the cylinder. The x-ray collimation system includes a tubular insert which contains an x-ray collimator. The insert is engageable in the bore of the piston. The collimator is mounted within the insert by means of an elastomeric o-ring at the end closest the opposed diamonds, and by means of a set of adjustable set screws at the opposite end. By adjustment of the set screws the collimator can be pivoted about the o-ring and brought into alignment with the opposed diamonds and the sample contained therein. In the preferred embodiment there is further provided a set of plugs which are insertable in the bore of the collimator. The plugs have bores of different diameters. By successively inserting plugs of progressively smaller bore diameters and adjusting the alignment of the collimator with each plug, the collimator can be quickly brought into accurate alignment with the diamonds. The collimation system allows alignment of the collimator either before or after the cell has been loaded and pressurized.

  12. Ferromagnetic ordering of Cr and Fe doped p-type diamond: An ab initio study

    SciTech Connect (OSTI)

    Benecha, E. M. [Department of Physics, University of South Africa, P.O Box 392, UNISA 0003, Pretoria (South Africa); Lombardi, E. B. [College of Graduate Studies, University of South Africa, P.O Box 392, UNISA 0003, Pretoria (South Africa)

    2014-02-21T23:59:59.000Z

    Ferromagnetic ordering of transition metal dopants in semiconductors holds the prospect of combining the capabilities of semiconductors and magnetic systems in single hybrid devices for spintronic applications. Various semiconductors have so far been considered for spintronic applications, but low Curie temperatures have hindered room temperature applications. We report ab initio DFT calculations on the stability and magnetic properties of Fe and Cr impurities in diamond, and show that their ground state magnetic ordering and stabilization energies depend strongly on the charge state and type of co-doping. We predict that divacancy Cr{sup +2} and substitutional Fe{sup +1} order ferromagnetically in p-type diamond, with magnetic stabilization energies (and magnetic moment per impurity ion) of 16.9 meV (2.5 ?{sub B}) and 33.3 meV (1.0 ?{sub B}), respectively. These magnetic stabilization energies are much larger than what has been achieved in other semiconductors at comparable impurity concentrations, including the archetypal dilute magnetic semiconductor GaAs:Mn. In addition, substitutional Fe{sup +1} exhibits a strong half-metallic character, with the Fermi level crossing bands in only the spin down channel. These results, combined with diamond’s extreme properties, demonstrate that Cr or Fe dopedp-type diamond may successfully be considered in the search for room temperature spintronic materials.

  13. Creation of deep blue light emitting nitrogen-vacancy center in nanosized diamond

    SciTech Connect (OSTI)

    Himics, L., E-mail: himics.laszlo@wigner.mta.hu; Tóth, S.; Veres, M.; Koós, M. [Institute for Solid State Physics and Optics, Wigner Research Center for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49 (Hungary); Balogh, Z. [Uzhhorod National University, 88000 Uzhhorod (Ukraine)

    2014-03-03T23:59:59.000Z

    This paper reports on the formation of complex defect centers related to the N3 center in nanosized diamond by employing plasma immersion and focused ion beam implantation methods. He{sup +} ion implantation into nanosized diamond “layer” was performed with the aim of creating carbon atom vacancies in the diamond structure, followed by the introduction of molecular N{sub 2}{sup +} ion and heat treatment in vacuum at 750?°C to initiate vacancy diffusion. To decrease the sp{sup 2} carbon content of nanosized diamond formed during the implantation processes, a further heat treatment at 450?°C in flowing air atmosphere was used. The modification of the bonding properties after each step of defect creation was monitored by Raman scattering measurements. The fluorescence measurements of implanted and annealed nanosized diamond showed the appearance of an intensive and narrow emission band with fine structures at 2.98?eV, 2.83?eV, and 2.71?eV photon energies.

  14. Diamond and Hydrogenated Carbons for Advanced Batteries and Fuel Cells: Fundamental Studies and Applications.

    SciTech Connect (OSTI)

    Swain; Greg M.

    2009-04-13T23:59:59.000Z

    The original funding under this project number was awarded for a period 12/1999 until 12/2002 under the project title Diamond and Hydrogenated Carbons for Advanced Batteries and Fuel Cells: Fundamental Studies and Applications. The project was extended until 06/2003 at which time a renewal proposal was awarded for a period 06/2003 until 06/2008 under the project title Metal/Diamond Composite Thin-Film Electrodes: New Carbon Supported Catalytic Electrodes. The work under DE-FG02-01ER15120 was initiated about the time the PI moved his research group from the Department of Chemistry at Utah State University to the Department of Chemistry at Michigan State University. This DOE-funded research was focused on (i) understanding structure-function relationships at boron-doped diamond thin-film electrodes, (ii) understanding metal phase formation on diamond thin films and developing electrochemical approaches for producing highly dispersed electrocatalyst particles (e.g., Pt) of small nominal particle size, (iii) studying the electrochemical activity of the electrocatalytic electrodes for hydrogen oxidation and oxygen reduction and (iv) conducting the initial synthesis of high surface area diamond powders and evaluating their electrical and electrochemical properties when mixed with a Teflon binder.

  15. Single-crystal diamond plate liftoff achieved by ion implantation and subsequent annealing

    SciTech Connect (OSTI)

    Parikh, N.R.; Hunn, J.D.; McGucken, E.; Swanson, M.L. (University of North Carolina, Chapel Hill, North Carolina 27599-3255 (United States)); White, C.W. (Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6048 (United States)); Rudder, R.A.; Malta, D.P.; Posthill, J.B.; Markunas, R.J. (Research Triangle Institute, Research Triangle Park, North Carolina 27709-2194 (United States))

    1992-12-28T23:59:59.000Z

    We describe a new method for removing thin, large area sheets of diamond from bulk or homoepitaxial diamond crystals. This method consists of an ion implantation step, followed by a selective etching procedure. High energy (4--5 MeV) implantation of carbon or oxygen ions creates a well-defined layer of damaged diamond that is buried at a controlled depth below the surface. For C implantations, this layer is graphitized by annealing in vacuum, and then etched in either an acid solution, or by heating at 550--600 [degree]C in oxygen. This process successfully lifts off the diamond plate above the graphite layer. For O implantations of a suitable dose (3[times]10[sup 17] cm[sup [minus]2] or greater), the liftoff is achieved by annealing in vacuum or flowing oxygen. In this case, the O required for etching of the graphitic layer is also supplied internally by the implantation. This liftoff method, combined with well-established homoepitaxial growth processes, has considerable potential for the fabrication of large area single crystalline diamond sheets.

  16. Kinetically Inhibited Order in a Diamond-Lattice Antiferromagnet

    SciTech Connect (OSTI)

    MacDougall, Gregory J [ORNL; Gout, Delphine J [ORNL; Zarestky, Jerel L [ORNL; Ehlers, Georg [ORNL; Podlesnyak, Andrey A [ORNL; McGuire, Michael A [ORNL; Mandrus, David [ORNL; Nagler, Stephen E [ORNL

    2011-01-01T23:59:59.000Z

    Frustrated magnetic systems exhibit highly degenerate ground states and strong fluctuations, often leading to new physics. An intriguing example of current interest is the antiferromagnet on a diamond lattice, realized physically in the A-site spinel materials. This is a prototypical system in three dimensions where frustration arises from competing interactions rather than purely geometric constraints, and theory suggests the possibility of novel order at low temperature. Here we present a comprehensive single crystal neutron scattering study CoAl2O4, a highly frustrated A-site spinel. We observe strong diffuse scattering that peaks at wavevectors associated with Neel ordering. Below the temperature T*=6.5K, there is a dramatic change in elastic scattering lineshape accompanied by the emergence of well-defined spin-wave excitations. T* had previously been associated with the onset of glassy behavior. Our new results suggest instead that in fact T* signifies a first-order phase transition, but with true long-range order inhibited by the kinetic freezing of domain walls. This scenario might be expected to occur widely in frustrated systems containing first-order phase transitions and is a natural explanation for existing reports of anomalous glassy behavior in other materials.

  17. Modeling electron emission and surface effects from diamond cathodes

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Dimitrov, D. A. [Tech-X Corp., Boulder, CO (United States); Ben-Zvi, I. [Brookhaven National Lab. (BNL), Upton, NY (United States); Smithe, D. [Tech-X Corp., Boulder, CO (United States); Cary, J. R. [Tech-X Corp., Boulder, CO (United States); Rao, T. [Brookhaven National Lab. (BNL), Upton, NY (United States); Smedley, J. [Brookhaven National Lab. (BNL), Upton, NY (United States); Wang, E. [Brookhaven National Lab. (BNL), Upton, NY (United States)

    2015-02-07T23:59:59.000Z

    We developed modeling capabilities, within the Vorpal particle-in-cell code, for three-dimensional (3D) simulations of surface effects and electron emission from semiconductor photocathodes. They include calculation of emission probabilities using general, piece-wise continuous, space-time dependent surface potentials, effective mass and band bending field effects. We applied these models, in combination with previously implemented capabilities for modeling charge generation and transport in diamond, to investigate the emission dependence on applied electric field in the range from approximately 2 MV/m to 17 MV/m along the [100] direction. The simulation results were compared to experimental data. For the considered parameter regime, conservation of transverse electron momentum (in the plane of the emission surface) allows direct emission from only two (parallel to [100]) of the six equivalent lowest conduction band valleys. When the electron affinity ? is the only parameter varied in the simulations, the value ? = 0.31 eV leads to overall qualitative agreement with the probability of emission deduced from experiments. Including band bending in the simulations improves the agreement with the experimental data, particularly at low applied fields, but not significantly. Using surface potentials with different profiles further allows us to investigate the emission as a function of potential barrier height, width, and vacuum level position. However, adding surface patches with different levels of hydrogenation, modeled with position-dependent electron affinity, leads to the closest agreement with the experimental data.

  18. Modeling electron emission and surface effects from diamond cathodes

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Dimitrov, D. A.; Ben-Zvi, I.; Smithe, D.; Cary, J. R.; Rao, T.; Smedley, J.; Wang, E.

    2015-02-07T23:59:59.000Z

    We developed modeling capabilities, within the Vorpal particle-in-cell code, for three-dimensional (3D) simulations of surface effects and electron emission from semiconductor photocathodes. They include calculation of emission probabilities using general, piece-wise continuous, space-time dependent surface potentials, effective mass and band bending field effects. We applied these models, in combination with previously implemented capabilities for modeling charge generation and transport in diamond, to investigate the emission dependence on applied electric field in the range from approximately 2 MV/m to 17 MV/m along the [100] direction. The simulation results were compared to experimental data. For the considered parameter regime, conservation of transversemore »electron momentum (in the plane of the emission surface) allows direct emission from only two (parallel to [100]) of the six equivalent lowest conduction band valleys. When the electron affinity ? is the only parameter varied in the simulations, the value ? = 0.31 eV leads to overall qualitative agreement with the probability of emission deduced from experiments. Including band bending in the simulations improves the agreement with the experimental data, particularly at low applied fields, but not significantly. Using surface potentials with different profiles further allows us to investigate the emission as a function of potential barrier height, width, and vacuum level position. However, adding surface patches with different levels of hydrogenation, modeled with position-dependent electron affinity, leads to the closest agreement with the experimental data.« less

  19. Diamond detector for high rate monitors of fast neutrons beams

    SciTech Connect (OSTI)

    Giacomelli, L.; Rebai, M.; Cippo, E. Perelli; Tardocchi, M.; Fazzi, A.; Andreani, C.; Pietropaolo, A.; Frost, C. D.; Rhodes, N.; Schooneveld, E.; Gorini, G. [Dipartimento di Fisica, Universita degli Studi di Milano-Bicocca, and Istituto di Fisica del Plasma, Associazione EURATOM-ENEA-CNR, Milano (Italy); Energy Department, Politecnico di Milano, Milano (Italy); Dipartimento di Fisica, Centro NAST, Universita degli Studi di Roma Tor Vergata, Roma (Italy); STFC, ISIS facility, Rutherford Appleton Laboratory, Chilton Didcot Oxfordshire (United Kingdom); Dipartimento di Fisica, Universita degli Studi di Milano-Bicocca, and Istituto di Fisica del Plasma, Associazione EURATOM-ENEA-CNR, Milano (Italy)

    2012-06-19T23:59:59.000Z

    A fast neutron detection system suitable for high rate measurements is presented. The detector is based on a commercial high purity single crystal diamond (SDD) coupled to a fast digital data acquisition system. The detector was tested at the ISIS pulsed spallation neutron source. The SDD event signal was digitized at 1 GHz to reconstruct the deposited energy (pulse amplitude) and neutron arrival time; the event time of flight (ToF) was obtained relative to the recorded proton beam signal t{sub 0}. Fast acquisition is needed since the peak count rate is very high ({approx}800 kHz) due to the pulsed structure of the neutron beam. Measurements at ISIS indicate that three characteristics regions exist in the biparametric spectrum: i) background gamma events of low pulse amplitudes; ii) low pulse amplitude neutron events in the energy range E{sub dep}= 1.5-7 MeV ascribed to neutron elastic scattering on {sup 12}C; iii) large pulse amplitude neutron events with E{sub n} < 7 MeV ascribed to {sup 12}C(n,{alpha}){sup 9}Be and 12C(n,n')3{alpha}.

  20. Diamond tool wear vs cutting distance on electroless nickel mirrors

    SciTech Connect (OSTI)

    Syn, C.K.; Taylor, J.S.; Donaldson, R.R.

    1986-10-14T23:59:59.000Z

    Wear data are presented for diamond tools cutting electroless nickel (eNi) for cut lengths up to 70,000 ft (13 miles). Two tools having different infrared absorption characteristics were used to cut an eNi preparation that had yielded minimum values for surface roughness and tool wear rate in a previous study. The data include Talystep measurement of the rms amplitude of the feed-marks versus cumulative cutting distance, representative examples of shape changes for the feed-mark profiles, SEM and optical micrographs of the tool rake and flank face wear zones, and measurements of the cutting edge profile and edge recession distance by a tool-nose replication technique. Feed-mark roughness values were found to increase from 5 to 90 A rms over the duration of the test, with an associated edge recession of about 1000 A and the development of a periodic tool edge grooving indicative of burnishing of the part surface. The ir absorption data successfully predicted the order of the two tools in terms of wear rate and fracture toughness.

  1. Photophysics of single nitrogen-vacancy centers in diamond nanocrystals

    E-Print Network [OSTI]

    M. Berthel; O. Mollet; G. Dantelle; T. Gacoin; S. Huant; A. Drezet

    2015-01-15T23:59:59.000Z

    A study of the photophysical properties of nitrogen-vacancy (NV) color centers in diamond nanocrystals of size of 50~nm or below is carried out by means of second-order time-intensity photon correlation and cross-correlation measurements as a function of the excitation power for both pure charge states, neutral and negatively charged, as well as for the photochromic state, where the center switches between both states at any power. A dedicated three-level model implying a shelving level is developed to extract the relevant photophysical parameters coupling all three levels. Our analysis confirms the very existence of the shelving level for the neutral NV center. It is found that it plays a negligible role on the photophysics of this center, whereas it is responsible for an increasing photon bunching behavior of the negative NV center with increasing power. From the photophysical parameters, we infer a quantum efficiency for both centers, showing that it remains close to unity for the neutral center over the entire power range, whereas it drops with increasing power from near unity to approximately 0.5 for the negative center. The photophysics of the photochromic center reveals a rich phenomenology that is to a large extent dominated by that of the negative state, in agreement with the excess charge release of the negative center being much slower than the photon emission process.

  2. Rome 2007 2nd International Industrial Diamond Conference Proceedings, Rome April 19-Development of a Procedure for Fatigue Crack Growth in PCD

    E-Print Network [OSTI]

    and the crack morphology. #12;1. Background Polycrystalline diamond cutters are known to fail during drilling polycrystalline diamond material inevitably leads to premature degradation of the cutter's ability to drill rockRome 2007 2nd International Industrial Diamond Conference Proceedings, Rome April 19- 20, 2007

  3. FAR-INFRARED SPECTROSCOPIC STUDY OF DIAMOND FILMS A. J. Gatesman*, R. H. Giles*, G. C. Phillips*, J. Waldman*, L. P. Bourget** and R. Post**

    E-Print Network [OSTI]

    Massachusetts at Lowell, University of

    **Applied Science and Technology, Inc., Woburn, MA 01801 High quality polycrystalline diamond films grownFAR-INFRARED SPECTROSCOPIC STUDY OF DIAMOND FILMS A. J. Gatesman*, R. H. Giles*, G. C. Phillips*, J in this frequency regime. INTRODUCTION Recent interest in the growth, production and application of diamond thin

  4. singapore_composites5.doc submitted to World Scientific 22/10/2003 -14:46 1/1 DIAMOND-FIBRE REINFORCED PLASTIC COMPOSITES

    E-Print Network [OSTI]

    Bristol, University of

    thin films of polycrystalline diamond on different substrates has enabled scientists and engineerssingapore_composites5.doc submitted to World Scientific 22/10/2003 - 14:46 1/1 DIAMOND of Bristol, Bristol BS8 1TR, UK Email: David.Smith@bris.ac.uk Diamond fibre reinforced poly

  5. Validating optical emission spectroscopy as a diagnostic of microwave activated CH4/Ar/H2 plasmas used for diamond chemical vapor deposition

    E-Print Network [OSTI]

    Bristol, University of

    chemical vapor deposition of polycrystalline diamond. Several tracer species are monitored in order to gain used for diamond chemical vapor deposition Jie Ma,1 Michael N. R. Ashfold,1,a and Yuri A. Mankelevich2 spectroscopic methods used to diagnose microwave MW plasmas used for diamond chemical vapor deposition CVD . Zhu

  6. Identification and characterization of wetlands in the Bear Creek watershed

    SciTech Connect (OSTI)

    Rosensteel, B.A. [JAYCOR, Oak Ridge, TN (United States); Trettin, C.C. [Oak Ridge National Lab., TN (United States)

    1993-10-01T23:59:59.000Z

    The primary objective of this study was to identify, characterize, and map the wetlands in the Bear Creek watershed. A preliminary wetland categorization system based on the Cowardin classification system (Cowardin et al. 1979) with additional site-specific topographic, vegetation, and disturbance characteristic modifiers was developed to characterize the type of wetlands that exist in the Bear Creek watershed. An additional objective was to detect possible relationships among site soils, hydrology, and the occurrence of wetlands in the watershed through a comparison of existing data with the field survey. Research needs are discussed in the context of wetland functions and values and regulatory requirements for wetland impact assessment and compensatory mitigation.

  7. Reply to: "Recycled" volatiles in mantle derived diamonds--Evidence from nitrogen and noble gas isotopic data

    E-Print Network [OSTI]

    Cartigny, Pierre

    and Honda [R.K. Mohapatra, and M. Honda, "Recycled" volatiles in mantle derived diamonds--evidence from (2005) 559­572.]. We present here reasons why the alternative view of Mohapatra and Honda [R.K. Mohapatra and M. Honda, "Recycled" volatiles in mantle derived diamonds--evidence from nitrogen and noble

  8. Synthetic diamond and wurtzite structures selfassemble with isotropic pair interactions Mikael Rechtsman, Frank Stillinger, Salvatore Torquato 2,3,4

    E-Print Network [OSTI]

    Stillinger, Frank

    Synthetic diamond and wurtzite structures self­assemble with isotropic pair interactions Mikael wurtzite lattices stabilize, evidenced lattice sums, phonon spectra, positive­energy defects, self result three­dimensional diamond and wurtzite structures self­assemble with isotropic teractions

  9. Salsbury and Diamond: Automated Testing of HVAC Systems for Commissioning -1 -Automated Testing of HVAC Systems for Commissioning

    E-Print Network [OSTI]

    and Diamond: Automated Testing of HVAC Systems for Commissioning - 1 - Automated Testing of HVAC Systems for Commissioning Tim Salsbury and Rick Diamond Lawrence Berkeley National Laboratory Berkeley, CA 94720 Synopsis This paper describes an approach to the automation of the commissioning of HVAC systems. The approach

  10. Plasma-activated direct bonding of diamond-on-insulator wafers to thermal oxide grown silicon wafers

    E-Print Network [OSTI]

    Akin, Tayfun

    microscopy, profilometer and wafer bow measurements. Plasma-activated direct bonding of DOI wafers to thermalPlasma-activated direct bonding of diamond-on-insulator wafers to thermal oxide grown silicon (CMP) on the diamond surface makes a poor bonding to silicon wafers with thermal oxide. Our results

  11. Seasonal steroid hormone levels and their relation to reproduction in the Western Diamond-backed Rattlesnake, Crotalus

    E-Print Network [OSTI]

    Taylor, Emily

    Seasonal steroid hormone levels and their relation to reproduction in the Western Diamond-backed levels in blood samples from free-ranging Western Diamond-backed Rattle- snakes (Crotalus atrox physiology, from under- standing basic mechanisms to designing treatments for reproductive dysfunction

  12. Development of Designer Diamond Technology for High Pressure High Temperature Experiments in Support of Stockpile Stewardship Program

    SciTech Connect (OSTI)

    Vohra, Yogesh, K.

    2009-10-28T23:59:59.000Z

    The role of nitrogen in the fabrication of designer diamond was systematically investigated by adding controlled amount of nitrogen in hydrogen/methane/oxygen plasma. This has led to a successful recipe for reproducible fabrication of designer diamond anvils for high-pressure high-temperature research in support of stockpile stewardship program. In the three-year support period, several designer diamonds fabricated with this new growth chemistry were utilized in high-pressure experiments at UAB and Lawrence Livermore National Laboratory. The designer diamond anvils were utilized in high-pressure studies on heavy rare earth metals, high pressure melting studies on metals, and electrical resistance measurements on iron-based layered superconductors under high pressures. The growth chemistry developed under NNSA support can be adapted for commercial production of designer diamonds.

  13. Nano-fabricated solid immersion lenses registered to single emitters in diamond

    E-Print Network [OSTI]

    L. Marseglia; J. P. Hadden; A. C. Stanley-Clarke; J. P. Harrison; B. Patton; Y. -L. D. Ho; B. Naydenov; F. Jelezko; J. Meijer; P. R. Dolan; J. M. Smith; J. G. Rarity; J. L. O'Brien

    2011-02-22T23:59:59.000Z

    We describe a technique for fabricating micro- and nano-structures incorporating fluorescent defects in diamond with a positional accuracy in the hundreds of nanometers. Using confocal fluorescence microscopy and focused ion beam (FIB) etching we first locate a suitable defect with respect to registration marks on the diamond surface and then etch a structure using these coordinates. We demonstrate the technique here by etching an 8 micron diameter hemisphere positioned such that a single negatively charged nitrogen-vacancy defect lies at its origin. This type of structure increases the photon collection efficiency by removing refraction and aberration losses at the diamond-air interface. We make a direct comparison of the fluorescence photon count rate before and after fabrication and observe an 8-fold increase due to the presence of the hemisphere.

  14. Development of Single Crystal Chemical Vapor Deposition Diamonds for Detector Applications

    SciTech Connect (OSTI)

    Rainer Wallny

    2012-10-15T23:59:59.000Z

    Diamond was studied as a possible radiation hard technology for use in future high radiation environments. With the commissioning of the LHC expected in 2010, and the LHC upgrades expected in 2015, all LHC experiments are planning for detector upgrades which require radiation hard technologies. Chemical Vapor Deposition (CVD) diamond has now been used extensively in beam conditions monitors as the innermost detectors in the highest radiation areas of BaBar, Belle and CDF and is installed and operational in all LHC experiments. As a result, this material is now being discussed as an alternative sensor material for tracking very close to the interaction region of the super-LHC where the most extreme radiation conditions will exist. Our work addressed the further development of the new material, single-crystal Chemical Vapor Deposition diamond, towards reliable industrial production of large pieces and new geometries needed for detector applications.

  15. Ultraviolet photosensitivity of sulfur-doped micro- and nano-crystalline diamond

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Mendoza, Frank; Makarov, Vladimir; Hidalgo, Arturo; Weiner, Brad; Morell, Gerardo

    2011-06-06T23:59:59.000Z

    The room-temperature photosensitivity of sulfur-doped micro- (MCD), submicro- (SMCD) and nano- (NCD) crystalline diamond films synthesized by hot-filament chemical vapor deposition was studied. The structure and composition of these diamond materials were characterized by Raman spectroscopy, scanning electron microscopy and X-ray diffraction. The UV sensitivity and response time were studied for the three types of diamond materials using a steady state broad UV excitation source and two pulsed UV laser radiations. It was found that they have high sensitivity in the UV region, as high as 109 sec-1mV-1 range, linear response in a broad spectral range below 320 nm, photocurrents around ~10-5 A, and short response time better than 100 ns, which is independent of fluency intensity. A phenomenological model was applied to help understand the role of defects and dopant concentration on the materials’ photosensitivity.

  16. Ultraviolet photosensitivity of sulfur-doped micro- and nano-crystalline diamond

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Mendoza, Frank; Makarov, Vladimir; Hidalgo, Arturo; Weiner, Brad; Morell, Gerardo

    2011-06-06T23:59:59.000Z

    The room-temperature photosensitivity of sulfur-doped micro- (MCD), submicro- (SMCD) and nano- (NCD) crystalline diamond films synthesized by hot-filament chemical vapor deposition was studied. The structure and composition of these diamond materials were characterized by Raman spectroscopy, scanning electron microscopy and X-ray diffraction. The UV sensitivity and response time were studied for the three types of diamond materials using a steady state broad UV excitation source and two pulsed UV laser radiations. It was found that they have high sensitivity in the UV region, as high as 109 sec-1mV-1 range, linear response in a broad spectral range below 320 nm, photocurrentsmore »around ~10-5 A, and short response time better than 100 ns, which is independent of fluency intensity. A phenomenological model was applied to help understand the role of defects and dopant concentration on the materials’ photosensitivity.« less

  17. Ultraviolet photosensitivity of sulfur-doped micro- and nano-crystalline diamond

    SciTech Connect (OSTI)

    Mendoza, Frank; Makarov, Vladimir; Hidalgo, Arturo; Weiner, Brad; Morell, Gerardo

    2011-06-06T23:59:59.000Z

    The room-temperature photosensitivity of sulfur-doped micro- (MCD), submicro- (SMCD) and nano- (NCD) crystalline diamond films synthesized by hot-filament chemical vapor deposition was studied. The structure and composition of these diamond materials were characterized by Raman spectroscopy, scanning electron microscopy and X-ray diffraction. The UV sensitivity and response time were studied for the three types of diamond materials using a steady state broad UV excitation source and two pulsed UV laser radiations. It was found that they have high sensitivity in the UV region, as high as 109 sec-1mV-1 range, linear response in a broad spectral range below 320 nm, photocurrents around ~10-5 A, and short response time better than 100 ns, which is independent of fluency intensity. A phenomenological model was applied to help understand the role of defects and dopant concentration on the materials’ photosensitivity.

  18. Temperature distributions in the laser-heated diamond anvil cell from 3-D numerical modeling

    SciTech Connect (OSTI)

    Rainey, E. S. G.; Kavner, A. [Department of Earth and Space Sciences, University of California, Los Angeles, California 90095 (United States); Hernlund, J. W. [Department of Earth and Planetary Science, University of California, Berkeley, California 94720 (United States); Earth-Life Science Institute, Megoro, Tokyo 152-8551 (Japan)

    2013-11-28T23:59:59.000Z

    We present TempDAC, a 3-D numerical model for calculating the steady-state temperature distribution for continuous wave laser-heated experiments in the diamond anvil cell. TempDAC solves the steady heat conduction equation in three dimensions over the sample chamber, gasket, and diamond anvils and includes material-, temperature-, and direction-dependent thermal conductivity, while allowing for flexible sample geometries, laser beam intensity profile, and laser absorption properties. The model has been validated against an axisymmetric analytic solution for the temperature distribution within a laser-heated sample. Example calculations illustrate the importance of considering heat flow in three dimensions for the laser-heated diamond anvil cell. In particular, we show that a “flat top” input laser beam profile does not lead to a more uniform temperature distribution or flatter temperature gradients than a wide Gaussian laser beam.

  19. Notes 09. Fluid inertia and turbulence in fluid film bearings

    E-Print Network [OSTI]

    San Andres, Luis

    2009-01-01T23:59:59.000Z

    . Luis San Andr?s ? 2009 14 References: Constantinescu, V.N., 1962, ?Analysis of Bearings Operating in the Turbulent Flow Regime,? ASME Journal of Lubrication Technology, Vol. 82, pp. 139-151. Hashimoto, H., S. Wada, M. Sumitomo, 1989, ?The Effects...

  20. In-situ combustion in hydrocarbon-bearing formations

    SciTech Connect (OSTI)

    Garthoffner, E.H.

    1986-10-07T23:59:59.000Z

    This patent describes a method of simulating production in a formation bearing heavy oil or tar, comprising injecting into the formation colloidal particles of metallic magnesium and causing the magnesium to be ignited, thereafter to be exothermally reacted with water in-situ, whereby exothermally to produce magnesium hydroxide and hydrogen gas in the formation.

  1. BIG BEAR SOLAR OBSERVATORY CENTER FOR SOLAR-TERRESTRIAL RESEARCH

    E-Print Network [OSTI]

    BIG BEAR SOLAR OBSERVATORY CENTER FOR SOLAR-TERRESTRIAL RESEARCH Faculty Position in Solar Physics, New Jersey Institute of Technology A tenure track faculty position in solar physics is available of NJIT's program in solar physics, visit http://solar.njit.edu. Applicants are required to have a Ph

  2. Synthesis and characterization of thorium-bearing britholites Olivier Terraa

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 20/12/2006 Synthesis and characterization of thorium-bearing britholites Olivier Terraa. In order to simulate tetravalent minor actinides, the incorporation of thorium, through dry chemical routes that the incorporation of thorium was effective whatever the thorium reagent used or the grinding conditions considered

  3. Feature Evaluation for Effective Bearing Prognostics , K. Medjaherb

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    account for the 40% of motor faults according to the research conducted by Electric Power Research in the vibration frequency [2] and vibration analysis is considered as the most reliable method in bearing failure detection [6]-[9]. However, it is often difficult to extract the failure signature due to the noise

  4. Gearbox Reliability Collaborative High Speed Shaft Tapered Roller Bearing Calibration

    SciTech Connect (OSTI)

    Keller, J.; Guo, Y.; McNiff, B.

    2013-10-01T23:59:59.000Z

    The National Renewable Energy Laboratory (NREL) Gearbox Reliability Collaborative (GRC) is a project investigating gearbox reliability primarily through testing and modeling. Previous dynamometer testing focused upon acquiring measurements in the planetary section of the test gearbox. Prior to these tests, the strain gages installed on the planetary bearings were calibrated in a load frame.

  5. Author's Accepted Manuscript Aircraft Landing Gear Greased Slider Bearing

    E-Print Network [OSTI]

    . Numerical results indicate fundamental differences in fluid flow behavior between greased and oil-lubricated in order to design high efficiency bearings. For more than 30 years, lubrication studies have been extended to include tem- perature effects [2]. Many of the thermo-elasto-hydrodynamic (TEHD) studies were steady

  6. Force measurements in magnetic bearings using fiber optic strain gauges

    E-Print Network [OSTI]

    Raymer, Stephen Geoffrey

    2000-01-01T23:59:59.000Z

    The research presented here develops a new method for measuring forces in magnetic bearings. Fiber-optic strain gauges (FOSGs) mounted to the side of the magnet poles are used to detect the small levels of strain that the metal experiences...

  7. Surprising Titanium Complexes Bearing 2-Pyrazolato Ligands: Synthesis, Structure, and

    E-Print Network [OSTI]

    Schlegel, H. Bernhard

    Surprising Titanium Complexes Bearing 2-Pyrazolato Ligands: Synthesis, Structure, and Molecular the synthesis and characterization of several homoleptic pz com- plexes of titanium(IV). These species complexes should be common in early to middle transition metals. Treatment of tetrakis(dimethylamido)titanium

  8. Bitumen-bearing deposits of the United States

    SciTech Connect (OSTI)

    Crysdale, B.L.; Schenk, C.J.

    1988-01-01T23:59:59.000Z

    Descriptions, resources, and petrophysical properties of bitumen-bearing rocks, or tar sands, in the United States are summarized by state and their locations indicated on the accompanying maps. One hundred ninety-eight identified deposits in 17 states yield a total bitumen resource estimated to be 57 billion barrels.

  9. Optimization of superconducting tiling pattern for superconducting bearings

    DOE Patents [OSTI]

    Hull, J.R.

    1996-09-17T23:59:59.000Z

    An apparatus and method for reducing magnetic field inhomogeneities which produce rotational loss mechanisms in high temperature superconducting magnetic bearings are disclosed. Magnetic field inhomogeneities are reduced by dividing high temperature superconducting structures into smaller structures, and arranging the smaller structures into tiers which stagger the magnetic field maximum locations of the smaller structures. 20 figs.

  10. Optimization of superconducting tiling pattern for superconducting bearings

    DOE Patents [OSTI]

    Hull, John R. (Hinsdale, IL)

    1996-01-01T23:59:59.000Z

    An apparatus and method for reducing magnetic field inhomogeneities which produce rotational loss mechanisms in high temperature superconducting magnetic bearings. Magnetic field inhomogeneities are reduced by dividing high temperature superconducting structures into smaller structures, and arranging the smaller structures into tiers which stagger the magnetic field maximum locations of the smaller structures.

  11. Improved x-ray collimation system for diamond-anvil high-pressure cells

    SciTech Connect (OSTI)

    Schiferl, D.; Olinger, B.; Livingston, R.

    1983-09-01T23:59:59.000Z

    An improved x-ray collimation system for diamond-anvil high-pressure cells is described. The usual practice of mounting the collimator directly in the diamond-anvil cell is not followed. Instead, the collimator is mounted and aligned in a fixture which can be removed from the diamong-anvil cell. The end of the collimator furthest from the sample can be fitted with a set of removable plugs, each with a different aperture. This collimation system is easily aligned, can be removed from the high-pressure cell with no loss of alignment, and is inexpensive to construct.

  12. Hyperfine-Enhanced Gyromagnetic Ratio of a Nuclear Spin in Diamond

    E-Print Network [OSTI]

    S. Sangtawesin; J. R. Petta

    2015-03-25T23:59:59.000Z

    Nuclear spins in the solid state environment of diamond are highly coherent, but difficult to rapidly control due to the small nuclear gyromagnetic ratio. Here we demonstrate a more than 50-fold enhancement of the effective nuclear gyromagnetic ratio by coupling the nuclear spin to an electronic spin of a nitrogen-vacancy (NV) center in diamond. The enhancement allows for faster nuclear spin rotations and is in good agreement with second-order perturbation theory. The method may be applied to other systems with similar electron-nuclear spin interactions, such as phosphorous donors in silicon, opening up the possibility of fast and direct nuclear spin control in coupled spin systems.

  13. Photo-stimulated low electron temperature high current diamond film field emission cathode

    DOE Patents [OSTI]

    Shurter; Roger Philips (Los Alamos, NM), Devlin; David James (Santa Fe, NM), Moody; Nathan Andrew (Los Alamos, NM), Taccetti; Jose Martin (Santa Fe, NM), Russell; Steven John (Los Alamos, NM)

    2012-07-24T23:59:59.000Z

    An electron source includes a back contact surface having a means for attaching a power source to the back contact surface. The electron source also includes a layer comprising platinum in direct contact with the back contact surface, a composite layer of single-walled carbon nanotubes embedded in platinum in direct contact with the layer comprising platinum. The electron source also includes a nanocrystalline diamond layer in direct contact with the composite layer. The nanocrystalline diamond layer is doped with boron. A portion of the back contact surface is removed to reveal the underlying platinum. The electron source is contained in an evacuable container.

  14. Synthesis of new Diamond-like B-C Phases under High Pressure and Temperatures

    SciTech Connect (OSTI)

    Ming, L. C. [University of Hawaii] [University of Hawaii; Zinin, P. V. [University of Hawaii] [University of Hawaii; Sharma, S. K. [University of Hawaii] [University of Hawaii

    2014-04-22T23:59:59.000Z

    A cubic BC3 (c-BC3) phase was synthesized by direct transformation from graphitic phases at a pressure of 39 GPa and temperature of 2200 K in a laser-heated diamond anvil cell (DAC). A combination of x-ray diffraction (XRD), electron diffraction (ED), transmission electron microscopy (TEM) imaging, and electron energy loss spectroscopy (EELS) measurements lead us to conclude that the obtained phase is hetero-nano-diamond, c-BC3. The EELS measurements show that the atoms inside the cubic structure are bonded by sp3 bonds.

  15. Field emission from bias-grown diamond thin films in a microwave plasma

    DOE Patents [OSTI]

    Gruen, Dieter M. (Downers Grove, IL); Krauss, Alan R. (Naperville, IL); Ding, Ming Q. (Beijing, CN); Auciello, Orlando (Bolinbrook, IL)

    2002-01-01T23:59:59.000Z

    A method of producing diamond or diamond like films in which a negative bias is established on a substrate with an electrically conductive surface in a microwave plasma chemical vapor deposition system. The atmosphere that is subjected to microwave energy includes a source of carbon, nitrogen and hydrogen. The negative bias is maintained on the substrate through both the nucleation and growth phase of the film until the film is continuous. Biases between -100V and -200 are preferred. Carbon sources may be one or more of CH.sub.4, C.sub.2 H.sub.2 other hydrocarbons and fullerenes.

  16. Design of flexible ultrahigh-Q microcavities in diamond-based photonic crystal slabs

    E-Print Network [OSTI]

    Snjezana Tomljenovic-Hanic; Andrew D. Greentree; C. Martijn de Sterke; Steven Prawer

    2008-12-10T23:59:59.000Z

    We design extremely flexible ultrahigh-Q diamond-based double-heterostructure photonic crystal slab cavities by modifying the refractive index of the diamond. The refractive index changes needed for ultrahigh-Q cavities with $Q ~ 10^7$, are well within what can be achieved ($\\Delta n \\sim 0.02$). The cavity modes have relatively small volumes $Vflexible because the range of parameters, cavity length and the index changes, that enables an ultrahigh-Q is quite broad. Furthermore as the index modification is post-processed, an efficient technique to generate cavities around defect centres is achievable, improving prospects for defect-tolerant quantum architectures.

  17. Analysis of flexure pivot tilting pad gas bearings with different damper configurations 

    E-Print Network [OSTI]

    Rimpel, Aaron Michael

    2009-05-15T23:59:59.000Z

    Hydrodynamic flexure pivot tilting pad gas bearings (FPTPGBs) can enable successful operation of oil-free microturbomachinery. This work presents the experimental and analytical study of such bearings with different damper configurations. A test rig...

  18. Bearing options, including design and testing, for direct drive linear generators in wave energy converters 

    E-Print Network [OSTI]

    Caraher, Sarah

    2011-11-22T23:59:59.000Z

    The key focus of this research was to investigate the bearing options most suited to operation in a novel direct drive linear generator. This was done through bearing comparisons, modelling and testing. It is fundamental ...

  19. Advances in hybrid water-lubricated journal bearings for use in ocean vessels

    E-Print Network [OSTI]

    Heberley, Brian Douglas

    2013-01-01T23:59:59.000Z

    The outboard bearings that support shafts in naval ships and submarines present unique challenges to designers, shipbuilders, and operators. Such bearings must operate continuously and reliably in demanding environments ...

  20. A Novel Computational Model for Tilting Pad Journal Bearings with Soft Pivot Stiffnesses

    E-Print Network [OSTI]

    Tao, Yujiao 1988-

    2012-12-10T23:59:59.000Z

    A novel tilting pad journal bearing model including pivot flexibility as well as temporal fluid inertia effects on the thin film fluid flow aims to accurately predict the bearing forced performance. The predictive model also accounts for the thermal...

  1. Measurements of static loading characteristics of a Flexurepivot Tilt Pad Hydrodynamic Bearing

    E-Print Network [OSTI]

    Walton, Nicholas Van Edward

    1995-01-01T23:59:59.000Z

    An experimental investigation examining the static loading characteristics of a four-pad, KMC FLEXUREPIVOT Tilt Pad Hydrodynamic Bearing is presented. Tests are conducted on the TRACE Fluid Film Bearing Element Test Rig for journal speeds ranging...

  2. Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings

    E-Print Network [OSTI]

    Sim, Kyu-Ho

    2009-05-15T23:59:59.000Z

    Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings were performed. First, compliant flexure pivot tilting pad gas bearings with pad radial compliance (CFTPBs) were introduced and designed for high-speed oil...

  3. Simulation of the dynamic behaviour of a geared transmission on hydrodynamic journal bearings

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    and bearings, oil injection, thermal effects, non Newtonian lubricant, etc. On the other hand, the dynamic whose reactions are calculated solving the lubrication equation presented in [3] under the short bearing

  4. Measurement of rotordynamic coefficients for a high-speed flexure pivot tilting-pad bearing(load between pad) configuration

    E-Print Network [OSTI]

    Al-Ghasem, Adnan Mahmoud

    2005-08-29T23:59:59.000Z

    This thesis presents the dynamic and static forced performance of a flexure-pivot tilting-pad bearing load between pad (LBP) configuration for different rotor speeds and bearing unit loadings. The bearing has the following design parameters: 4 pads...

  5. Wind Turbine Design Guideline DG03: Yaw and Pitch Rolling Bearing Life

    SciTech Connect (OSTI)

    Harris, T.; Rumbarger, J. H.; Butterfield, C. P.

    2009-12-01T23:59:59.000Z

    This report describes the design criteria, calculation methods, and applicable standards recommended for use in performance and life analyses of ball and roller (rolling) bearings for yaw and pitch motion support in wind turbine applications. The formulae presented here for rolling bearing analytical methods and bearing-life ratings are consistent with methods in current use by wind turbine designers and rolling-bearing manufacturers.

  6. Thermal degradation of the performance of elastomeric bearings for seismic isolation

    E-Print Network [OSTI]

    Shirazi, Ali

    2010-01-01T23:59:59.000Z

    CALIFORNIA, SAN DIEGO Thermal Degradation of the Performance90 Degradation of93 5 DEGRADATION PHENOMENON IN ELASTOMERIC BEARINGS AND THE

  7. Progress on the 1.6-meter New Solar Telescope at Big Bear Solar Observatory

    E-Print Network [OSTI]

    Progress on the 1.6-meter New Solar Telescope at Big Bear Solar Observatory C. Denkera, P. R, Newark, NJ 07102, U.S.A. bBig Bear Solar Observatory, 40386 North Shore Lane, Big Bear City, CA 92314, U.S.A. cSeoul National University, School of Earth and Environmental Science, Seoul, 151-742 Republic

  8. Induction Motors Bearing Failures Detection and Diagnosis: Park and Concordia Transform

    E-Print Network [OSTI]

    Boyer, Edmond

    to metallurgical damage from interrupted electrical current flow. Increased noise and vibration are typicalInduction Motors Bearing Failures Detection and Diagnosis: Park and Concordia Transform Approaches with the problem of bearing failure detection and diagnosis in induction motors. Indeed, bearings deterioration

  9. Field Metabolic Rate and PCB Adipose Tissue Deposition Efficiency in East Greenland Polar Bears Derived from

    E-Print Network [OSTI]

    Schierup, Mikkel Heide

    Field Metabolic Rate and PCB Adipose Tissue Deposition Efficiency in East Greenland Polar Bears metabolic rates (FMR) and CB153 deposition efficiencies in East Greenland polar bears. Our simulations Greenland polar bears. Citation: Pavlova V, Nabe-Nielsen J, Dietz R, Svenning J-C, Vorkamp K, et al. (2014

  10. Diamond-anvil high-pressure cell with improved x-ray collimation system

    SciTech Connect (OSTI)

    Schiferl, D.; Olinger, B.W.; Livingston, R.W.

    1986-07-22T23:59:59.000Z

    This patent describes a diamond-anvil high-pressure cell having a tubular piston and a cylinder in which the piston is slidable to effect compression of a pair of opposed diamonds located between the piston and the cylinder. The piston includes a central bore opening on one end, an adjustable X-ray collimation system comprising a tubular insert engageable in the bore of the piston, the insert including a central bore and having first and second ends, with the first end of the insert being closest to the opposed diamonds and the second end of the insert extending out of the open end of the piston, a collimator insertable in the bore of the tubular insert. The collimator has a central bore and having first and second ends corresponding respectively with the first and second ends of the insert, elastomeric pivot means mounted in the bore of the insert at the first end of the insert for flexibly retaining the first end of the collimator while allowing the collimator to pivot within the pivot means, and adjustable locking means located at the second end of the insert for adjusting and securing the second end of the collimator so as to be in alignment with the opposed diamonds.

  11. Automated Testing of HVAC Systems for Commissioning Tim Salsbury and Rick Diamond

    E-Print Network [OSTI]

    Diamond, Richard

    carrying out a proof of operation. In large modern buildings, the energy management and control system to exercise systems while under closed-loop control. The test signals are in the form of setpoint changesAutomated Testing of HVAC Systems for Commissioning Tim Salsbury and Rick Diamond Lawrence Berkeley

  12. PHYSICAL REVIEW B 83, 193410 (2011) Denser than diamond: Ab initio search for superdense carbon allotropes

    E-Print Network [OSTI]

    Oganov, Artem R.

    . At ambient conditions, the hP3 phase is a semiconductor with the GW band gap of 3.0 eV, tI12 is an insulator semimetallic (graphite, an excel- lent lubricant) and even superconducting (doped diamond and fullerenes).1 two-dimensional (2D) mate- rial is graphene. Such extremely high density, with uniquely high valence

  13. A robust scanning diamond sensor for nanoscale imaging with single nitrogen-vacancy centres

    E-Print Network [OSTI]

    Walsworth, Ronald L.

    A robust scanning diamond sensor for nanoscale imaging with single nitrogen-vacancy centres P-vacancy centre within a few nanometres of a sample, and then scan it across the sample surface, while preserving the centre's spin coherence and readout fidelity. However, existing scanning techniques, which use a single

  14. Method to grow pure nanocrystalline diamond films at low temperatures and high deposition rates

    DOE Patents [OSTI]

    Carlisle, John A. (Plainfield, IL); Gruen, Dieter M. (Downers Grove, IL); Auciello, Orlando (Bolingbrook, IL); Xiao, Xingcheng (Woodridge, IL)

    2009-07-07T23:59:59.000Z

    A method of depositing nanocrystalline diamond film on a substrate at a rate of not less than about 0.2 microns/hour at a substrate temperature less than about 500.degree. C. The method includes seeding the substrate surface with nanocrystalline diamond powder to an areal density of not less than about 10.sup.10sites/cm.sup.2, and contacting the seeded substrate surface with a gas of about 99% by volume of an inert gas other than helium and about 1% by volume of methane or hydrogen and one or more of acetylene, fullerene and anthracene in the presence of a microwave induced plasma while maintaining the substrate temperature less than about 500.degree. C. to deposit nanocrystalline diamond on the seeded substrate surface at a rate not less than about 0.2 microns/hour. Coatings of nanocrystalline diamond with average particle diameters of less than about 20 nanometers can be deposited with thermal budgets of 500.degree. C.-4 hours or less onto a variety of substrates such as MEMS devices.

  15. Advances in PSII Deposited Diamond-Like Carbon Coatings for Use as a Corrosion Barrier

    E-Print Network [OSTI]

    Advances in PSII Deposited Diamond-Like Carbon Coatings for Use as a Corrosion Barrier R. S to improve corrosion resistance, however, the necessary organometallics needed to implant these materials to produce an adherent, hard, wear and, corrosion-resistant coating plays a vital role. These applications

  16. Proceedings of the Seventh Applied Diamond Conference/Third Frontier Carbon

    E-Print Network [OSTI]

    Tzeng, Yonhua

    Proceedings of the Seventh Applied Diamond Conference/Third Frontier Carbon Technology Joint Conference (ADC/FCT 2003) NASA/CP--2003-212319 August 2003 #12;The NASA STI Program Office . . . in Profile. · CONFERENCE PUBLICATION. Collected papers from scientific and technical conferences, symposia, seminars

  17. Diamond anvil cell for spectroscopic investigation of materials at high temperature, high pressure and shear

    DOE Patents [OSTI]

    Westerfield, C.L.; Morris, J.S.; Agnew, S.F.

    1997-01-14T23:59:59.000Z

    Diamond anvil cell is described for spectroscopic investigation of materials at high temperature, high pressure and shear. A cell is described which, in combination with Fourier transform IR spectroscopy, permits the spectroscopic investigation of boundary layers under conditions of high temperature, high pressure and shear. 4 figs.

  18. Diamond anvil cell for spectroscopic investigation of materials at high temperature, high pressure and shear

    DOE Patents [OSTI]

    Westerfield, Curtis L. (Espanola, NM); Morris, John S. (Los Alamos, NM); Agnew, Stephen F. (Los Alamos, NM)

    1997-01-01T23:59:59.000Z

    Diamond anvil cell for spectroscopic investigation of materials at high temperature, high pressure and shear. A cell is described which, in combination with Fourier transform IR spectroscopy, permits the spectroscopic investigation of boundary layers under conditions of high temperature, high pressure and shear.

  19. Graphene-on-Diamond Devices with Increased Current-Carrying Capacity: Carbon sp2

    E-Print Network [OSTI]

    Graphene-on-Diamond Devices with Increased Current-Carrying Capacity: Carbon sp2 -on-sp3 Technology Laboratory, Illinois 60439, United States *S Supporting Information ABSTRACT: Graphene demonstrated potential for practical applications owing to its excellent electronic and thermal properties. Typical graphene field

  20. High quality factor nanocrystalline diamond micromechanical resonators limited by thermoelastic damping

    SciTech Connect (OSTI)

    Najar, Hadi, E-mail: hnajar@ucdavis.edu [Department of Electrical and Computer Engineering, University of California, Davis, California 95616 (United States); Chan, Mei-Lin [Department of Mechanical and Aerospace Engineering, University of California, Davis, California 95616 (United States); Yang, Hsueh-An; Lin, Liwei [Department of Mechanical Engineering, University of California, Berkeley, California 94720 (United States); Cahill, David G. [Department of Materials Science and Engineering, Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 (United States); Horsley, David A. [Department of Electrical and Computer Engineering, University of California, Davis, California 95616 (United States); Department of Mechanical and Aerospace Engineering, University of California, Davis, California 95616 (United States)

    2014-04-14T23:59:59.000Z

    We demonstrate high quality factor thin-film nanocrystalline diamond micromechanical resonators with quality factors limited by thermoelastic damping. Cantilevers, single-anchored and double-anchored double-ended tuning forks, were fabricated from 2.5??m thick in-situ boron doped nanocrystalline diamond films deposited using hot filament chemical vapor deposition. Thermal conductivity measured by time-domain thermoreflectance resulted in 24?±?3?W m{sup ?1} K{sup ?1} for heat transport through the thickness of the diamond film. The resonant frequencies of the fabricated resonators were 46?kHz–8?MHz and showed a maximum measured Q???86?000 at f{sub n}?=?46.849?kHz. The measured Q-factors are shown to be in good agreement with the limit imposed by thermoelastic dissipation calculated using the measured thermal conductivity. The mechanical properties extracted from resonant frequency measurements indicate a Young's elastic modulus of ?788?GPa, close to that of microcrystalline diamond.