Sample records for diamond bar ca

  1. Diamond Bar, California: 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 JumpConceptual Model,DOE Facility DatabaseMichigan:Dewey-Humboldt, Arizona:Research CompanyBar,

  2. Stability and breakdown of Ca{sup 13}CO{sub 3} melt associated with formation of {sup 13}C-diamond in static high pressure experiments up to 43 GPa and 3900 K

    SciTech Connect (OSTI)

    Spivak, A.V., E-mail: spivak@iem.ac.ru [Institute of Experimental Mineralogy of the Russian Academy of Sciences, Chernogolovka, Moscow Region (Russian Federation); Litvin, Yu.A. [Institute of Experimental Mineralogy of the Russian Academy of Sciences, Chernogolovka, Moscow Region (Russian Federation); Ovsyannikov, S.V. [Bayerishes Geoinstitut, University of Bayreuth, Bayreuth (Germany); Dubrovinskaia, N.A. [Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Bayreuth (Germany); Dubrovinsky, L.S. [Bayerishes Geoinstitut, University of Bayreuth, Bayreuth (Germany)

    2012-07-15T23:59:59.000Z

    Melting of calcium carbonate Ca{sup 13}CO{sub 3}, stability of the melt and its decomposition were studied in static high pressure experiments at pressures of 11-43 GPa and temperatures of 1600-3900 K using diamond anvil cell technique with laser heating. We observed formation of {sup 13}C-graphite (below 16 GPa) and {sup 13}C-diamond (between 16 and 43 GPa) on decomposition of the Ca{sup 13}CO{sub 3} melt at temperatures above 3400 K. At temperatures below 3400 K congruent melting of calcium carbonate was confirmed. The experimental results were applied to construction of the phase diagram of CaCO{sub 3} up to 43 GPa and 3900 K focusing at the melting curve of calcium carbonate and the decomposition phase boundary of CaCO{sub 3} melt. - Graphical abstract: Highlights: Black-Right-Pointing-Pointer Phase states of CaCO{sub 3} were studied at P=11-43 GPa and T=1600-3900 K. Black-Right-Pointing-Pointer {sup 13}C-diamond easily crystallizes in carbonate-carbon (Ca{sup 13}CO{sub 3-}{sup 13}C-graphite) melt-solutions. Black-Right-Pointing-Pointer Ca-carbonate melts congruently that was observed in experiments in DAC with laser heating. Black-Right-Pointing-Pointer Decomposition of CaCO{sub 3} melt, indicated by formation of graphite and/or diamond. Black-Right-Pointing-Pointer Decomposition of CaCO{sub 3} was observed at temperatures above 3400 K in the pressure interval studied.

  3. Ca

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

    P O. Box 3090 Ca rlsbad, New Mexico 88221 Mr. John Kieling , Acting Bureau Chief Hazardous Waste Bureau MAY 1 6 2012 New Mexico Environment Department 2905 E. Rodeo Park Drive,...

  4. 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

  5. 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.

  6. 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

  7. 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.

  8. 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

  9. 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.

  10. 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.

  11. 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,

  12. 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.

  13. 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.

  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. 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

  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. 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.

  20. 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.

  1. 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

  2. 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

  3. 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.

  4. Calcite dissolution kinetics and solubility in Na-Ca-Mg-Cl brines of geologically relevant composition at 0.1 to 1 bar pCO2 and 25 to 80°C 

    E-Print Network [OSTI]

    Gledhill, Dwight Kuehl

    2006-08-16T23:59:59.000Z

    injection of CO2. This study measured calcite solubility and dissolution rates in geologically relevant Na-Ca-Mg-Cl synthetic brines (35 to 200 g L-1 TDS). In brines < 50 g L-1 TDS, the EQPITZER calculated calcium carbonate ion activity product (IAP...

  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. 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.

  7. 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.

  8. 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.

  9. 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

  10. 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

  11. 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.

  12. 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

  13. 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.

  14. The bar instability revisited

    E-Print Network [OSTI]

    Filippo Chiodi; Bruno Andreotti; Philippe Claudin

    2012-10-11T23:59:59.000Z

    The river bar instability is revisited, using a hydrodynamical model based on Reynolds averaged Navier-Stokes equations. The results are contrasted with the standard analysis based on shallow water Saint-Venant equations. We first show that the stability of both transverse modes (ripples) and of small wavelength inclined modes (bars) predicted by the Saint-Venant approach are artefacts of this hydrodynamical approximation. When using a more reliable hydrodynamical model, the dispersion relation does not present any maximum of the growth rate when the sediment transport is assumed to be locally saturated. The analysis therefore reveals the fundamental importance of the relaxation of sediment transport towards equilibrium as it it is responsible for the stabilisation of small wavelength modes. This dynamical mechanism is characterised by the saturation number, defined as the ratio of the saturation length to the water depth Lsat/H. This dimensionless number controls the transition from ripples (transverse patterns) at small Lsat/H to bars (inclined patterns) at large Lsat/H. At a given value of the saturation number, the instability presents a threshold and a convective-absolute transition, both controlled by the channel aspect ratio {\\beta}. We have investigated the characteristics of the most unstable mode as a function of the main parameters, Lsat/H, {\\beta} and of a subdominant parameter controlling the relative influence of drag and gravity on sediment transport. As previously found, the transition from alternate bars to multiple bars is mostly controlled by the river aspect ratio {\\beta}. By contrast, in the alternate bar regime (large Lsat/H), the selected wavelength does not depend much on {\\beta} and approximately scales as H^(2/3)L^(1/3)/C, where C is the Ch\\'ezy number.

  15. 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

  16. 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

  17. Mechanical properties of fiber-reinforced YBa{sub 2}Cu{sub 3}O{sub x} and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub x} bars

    SciTech Connect (OSTI)

    Goretta, K.C.; Martin, L.J.; Singh, D.; Poeppel, R.B.; Chen, Nan; Chu, C.Y.; Routbort, J.C. [Argonne National Lab., IL (United States); Gleixner, R.A. [Babcock and Wilcox Co., Alliance, OH (United States)

    1993-07-01T23:59:59.000Z

    Strength in four-point bending and fracture toughness of YBa{sub 2}Cu{sub 3}O{sub x} (123) and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub x} (2212) were examined at room temperature. The 123 was reinforced with 15 vol.% Y{sub 2}BaCuO{sub 5} (211) fibers and was processed to 90--91% density by cold pressing and sintering. The 2212 was reinforced with 15 vol.% 2212 fibers and was processed to {approx}90% density by sinter forging. The 123/211 composites had a fracture toughness of 1.9 MPa(m){sup 0.5}, which is 20--30% higher than that of corresponding monoliths, but exhibited no improvement in strength. The strength and fracture toughness of the 2212/2212 composites were 102 MPa and 2.7 MPa(m){sup 0.5}, respectively, which were slight improvements over the monoliths. Transport critical current densities at 77 K were only slightly affected by the fiber additions.

  18. 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.

  19. 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.

  20. Bahasa Indonesia Kfir Bar

    E-Print Network [OSTI]

    Dershowitz, Nachum

    Bahasa Indonesia Kfir Bar #12;Malay Archipelago · During Islam era: Malay) · Dutch and Portuguese traders arrived during the 15th century · Indonesia became a Dutch colony · Indonesia independent - 1945 #12;#12;Indonesian · Formed ­ 15th

  1. 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.

  2. 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.

  3. BAR PACKAGES Standard Bar Package Price Liquor Beer/Wine

    E-Print Network [OSTI]

    Westneat, Mark W.

    BAR PACKAGES Standard Bar Package Price Liquor Beer/Wine 1-2 hours $21/ person Sobieski Vodka MGD 3 Select Wine Cutty Sark Scotch Cruzan Rum Premium Bar Package Price Liquor Beer/Wine 1-2 hours $24/person Beer/Wine 1-2 hours $28/person Grey Goose Vodka MGD/Miller Light 3 hours $33/person Bombay Sapphire Two

  4. The bar instability revisited

    E-Print Network [OSTI]

    Chiodi, Filippo; Claudin, Philippe

    2012-01-01T23:59:59.000Z

    The river bar instability is revisited, using a hydrodynamical model based on Reynolds averaged Navier-Stokes equations. The results are contrasted with the standard analysis based on shallow water Saint-Venant equations. We first show that the stability of both transverse modes (ripples) and of small wavelength inclined modes (bars) predicted by the Saint-Venant approach are artefacts of this hydrodynamical approximation. When using a more reliable hydrodynamical model, the dispersion relation does not present any maximum of the growth rate when the sediment transport is assumed to be locally saturated. The analysis therefore reveals the fundamental importance of the relaxation of sediment transport towards equilibrium as it it is responsible for the stabilisation of small wavelength modes. This dynamical mechanism is characterised by the saturation number, defined as the ratio of the saturation length to the water depth Lsat/H. This dimensionless number controls the transition from ripples (transverse patte...

  5. 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...

  6. 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

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. Does the "Feebate" Approach to A/E Compensation Lead to an Energy-Efficient John Busch and Rick Diamond

    E-Print Network [OSTI]

    Diamond, Richard

    and Rick Diamond Lawrence Berkeley Laboratory Energy and Environment Division Berkeley CA 94720 USA are almost exclusively used in retrofit situations where the baseline energy consumption is moreDoes the "Feebate" Approach to A/E Compensation Lead to an Energy-Efficient Building?* John Busch

  15. 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.

  16. 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;

  17. 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.

  18. 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.

  19. 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

  20. 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.

  1. 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.

  2. Transverse Spin Polarization of $\\tau^-$ in ${\\bar{B}}^0\\rightarrow D^{+} \\tau^- {\\bar{\

    E-Print Network [OSTI]

    Hwang, Dae Sung

    2015-01-01T23:59:59.000Z

    The spin of the $\\tau$ lepton in the semiletonic process ${\\bar{B}}^0\\rightarrow D^{+} \\tau^- {\\bar{\

  3. 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.

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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.

  11. 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.

  12. Centers of Barred Galaxies: Secondary Bars and Gas Flows

    E-Print Network [OSTI]

    Witold Maciejewski

    1999-11-15T23:59:59.000Z

    Active Galactic Nuclei (AGN) require mass accretion onto the central engine. On large galactic scales, torques from a stellar bar can efficiently remove angular momentum from gas, and cause it to move inwards along two hydrodynamical shocks on the leading edges of the bar. Inflowing gas settles on near-circular orbits around the Inner Lindblad Resonance (ILR), and forms a nuclear ring, about 1 kpc in size. A secondary bar inside the main one, with its own pair of shocks, has been proposed to drive further inflow, and thus feed the AGN in a manner similar to the inflow on large scales. Here, we report results of high resolution hydrodynamical simulations, where we examine the nature of the nuclear ring, and check how efficient double bars can be in fueling AGNs.

  13. Triple bar, high efficiency mechanical sealer

    DOE Patents [OSTI]

    Pak, Donald J.; Hawkins, Samantha A.; Young, John E.

    2013-03-19T23:59:59.000Z

    A clamp with a bottom clamp bar that has a planar upper surface is provided. The clamp may also include a top clamp bar connected to the bottom clamp bar, and a pressure distribution bar between the top clamp bar and the bottom clamp bar. The pressure distribution bar may have a planar lower surface in facing relation to the upper surface of the bottom clamp bar. An object is capable of being disposed in a clamping region between the upper surface and the lower surface. The width of the planar lower surface may be less than the width of the upper surface within the clamping region. Also, the pressure distribution bar may be capable of being urged away from the top clamp bar and towards the bottom clamp bar.

  14. 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.

  15. 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.

  16. 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

  17. 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...

  18. 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...

  19. 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.

  20. (ESH), (), -(C-A).

    E-Print Network [OSTI]

    Homes, Christopher C.

    (ESH), (), - (C-A). C-A , , . , (ESHQ) C-A (Ray Karol, 5272, Pager 453-5971) C-A (Ed Lessard, x4250). . (ESH) - (-) " - " . . " " . 2 - . 3 - . 4 - ESH . 5 - ESH - . 5 - . 5 - . 5 - . 5 - ESH . 6 - . 7

  1. 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.

  2. 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...

  3. 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...

  4. 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.

  5. 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.

  6. 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.

  7. 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

  8. Microscopic study of Ca$+$Ca fusion

    E-Print Network [OSTI]

    R. Keser; A. S. Umar; V. E. Oberacker

    2012-02-17T23:59:59.000Z

    We investigate the fusion barriers for reactions involving Ca isotopes $\\mathrm{^{40}Ca}+\\mathrm{^{40}Ca}$, $\\mathrm{^{40}Ca}+\\mathrm{^{48}Ca}$, and $\\mathrm{^{48}Ca}+\\mathrm{^{48}Ca}$ using the microscopic time-dependent Hartree-Fock theory coupled with a density constraint. In this formalism the fusion barriers are directly obtained from TDHF dynamics. We also study the excitation of the pre-equilibrium GDR for the $\\mathrm{^{40}Ca}+\\mathrm{^{48}Ca}$ system and the associated $\\gamma$-ray emission spectrum. Fusion cross-sections are calculated using the incoming-wave boundary condition approach. We examine the dependence of fusion barriers on collision energy as well as on the different parametrizations of the Skyrme interaction.

  9. 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

  10. 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.

  11. 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.

  12. 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.

  13. EMPLOYMENT SUMMARY FOR 2011 GRADUATES San Francisco, CA 94117

    E-Print Network [OSTI]

    Galles, David

    EMPLOYMENT SUMMARY FOR 2011 GRADUATES San Francisco, CA 94117 Website : http - Start Date Deferred 0 Total graduates 222 Unemployed - Not Seeking 8 Employment Status Unknown 13 Unemployed - Seeking 26 Employed - Undeterminable * 0 0 0 0 0 Employed - Bar Passage Required 76 3 6 26 111

  14. 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...

  15. 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...

  16. 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

  17. 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.

  18. Electronic and physico-chemical properties of nanometric boron delta-doped diamond structures

    SciTech Connect (OSTI)

    Chicot, G., E-mail: gauthier.chicot@neel.cnrs.fr; Fiori, A.; Tran Thi, T. N.; Bousquet, J.; Delahaye, J.; Grenet, T.; Eon, D.; Omnès, F.; Bustarret, E. [Université Grenoble Alpes, Institut NEEL, 38042 Grenoble (France); CNRS, Institut NEEL, 38042 Grenoble (France); Volpe, P. N.; Tranchant, N.; Mer-Calfati, C.; Arnault, J. C. [CEA, LIST, Diamond Sensors Laboratory, 91191 Gif-sur-Yvette (France); Gerbedoen, J. C.; Soltani, A.; De Jaeger, J. C. [IEMN, UMR-CNRS 8520, Avenue Poincaré, Université de Lille 1, 59652 Villeneuve d'Ascq (France); Alegre, M. P.; Piñero, J. C.; Araújo, D. [Dpto Ciencia de los Materiales, Facultad de Ciencias, Universidad de Cádiz, 11510 Puerto Real (Cádiz) (Spain); Jomard, F. [Groupe d'Étude de la Matière Condensée (GEMaC), UMR 8635 du CNRS, UVSQ, 45 Avenue des États-Unis, 78035 Versailles Cedex (France); and others

    2014-08-28T23:59:59.000Z

    Heavily boron doped diamond epilayers with thicknesses ranging from 40 to less than 2?nm and buried between nominally undoped thicker layers have been grown in two different reactors. Two types of [100]-oriented single crystal diamond substrates were used after being characterized by X-ray white beam topography. The chemical composition and thickness of these so-called delta-doped structures have been studied by secondary ion mass spectrometry, transmission electron microscopy, and spectroscopic ellipsometry. Temperature-dependent Hall effect and four probe resistivity measurements have been performed on mesa-patterned Hall bars. The temperature dependence of the hole sheet carrier density and mobility has been investigated over a broad temperature range (6?K?

  19. Dynamical Decoupling of Nested Bars: Self-Gravitating Gaseous Nuclear Bars

    E-Print Network [OSTI]

    Peter Englmaier; Isaac Shlosman

    2004-10-11T23:59:59.000Z

    A substantial fraction of barred galaxies host additional nuclear bars which tumble with pattern speeds exceeding those of the large-scale (primary) stellar bars. We have investigated the mechanism of formation and dynamical decoupling in such nested bars which include gaseous (secondary) nuclear bars within the full size galactic disks, hosting a double inner Lindblad resonance. Becoming increasingly massive and self-gravitating, the nuclear bars lose internal (circulation) angular momentum to the primary bars and increase their strength. Developing chaos within these bars triggers a rapid gas collapse -- bar contraction. During this time period, the secondary bar pattern speed Omega_s~a^{-1}, where "a" stands for the bar size. As a result, Omega_s increases dramatically until a new equilibrium is reached (if at all), while the gas specific angular momentum decreases -- demonstrating the dynamical decoupling of nested bars. Viscosity, and therefore the gas presence, appears to be a necessary condition for the prograde decoupling of nested bars. This process maintains an inflow rate of ~1 M_o/yr over ~10^8 yrs across the central 200 pc and has important implications for fueling the nuclear starbursts and AGN.

  20. 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.

  1. 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...

  2. 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...

  3. COBE's Galactic Bar and Disk

    E-Print Network [OSTI]

    H. T. Freudenreich

    1997-08-04T23:59:59.000Z

    A model of the bar and old stellar disk of the Galaxy has been derived from the survey of the Diffuse Infrared Background Experiment (DIRBE) of the Cosmic Background Explorer at wavelengths of 1.25, 2.2, 3.5, and 4.9 microns. It agrees very well with the data, except in directions in which the near- infrared optical depth is high. Among the conclusions drawn from the model: The Sun is located approximately 16.5 pc above the midpoint of the Galactic plane. The disk has an outer edge four kpc from the Sun, and is warped like the HI layer. It has a central hole roughly the diameter of the inner edge of the "three-kiloparsec" molecular cloud ring, and within that hole lies a bright, strong, "early-type" bar, tilted approximately 14 degrees from the Sun-Galactic center line. The model has 47 free parameters. The model is discussed in detail and contour plots and images of the residuals presented.

  4. 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.

  5. 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.

  6. 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

  7. 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.

  8. 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...

  9. 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...

  10. 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...

  11. 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...

  12. 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.

  13. 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,...

  14. 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....

  15. Pattern speed evolution and bar reformation

    E-Print Network [OSTI]

    F. Combes

    2008-11-05T23:59:59.000Z

    Bars in spiral galaxies can weaken through gas inflow towards the center, and angular momentum transfer. Several bar episodes can follow one another in the life of the galaxy, if sufficient gas is accreted from the intergalactic medium to revive young disks. Pattern speeds of the successive bars are different, due to mass concentration, or increased velocity dispersion of the remaining stellar component. In the same time, the spiral galaxy evolves in morphological type. Numerical simulations are presented, trying to correlate type and bar pattern speeds.

  16. Tennessee Nuclear Profile - Watts Bar Nuclear Plant

    U.S. Energy Information Administration (EIA) Indexed Site

    Watts Bar Nuclear Plant" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration...

  17. 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.

  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. Gas flow in barred potentials

    E-Print Network [OSTI]

    Sormani, Mattia C; Magorrian, John

    2015-01-01T23:59:59.000Z

    We use a Cartesian grid to simulate the flow of gas in a barred Galactic potential and investigate the effects of varying the sound speed in the gas and the resolution of the grid. For all sound speeds and resolutions, streamlines closely follow closed orbits at large and small radii. At intermediate radii shocks arise and the streamlines shift between two families of closed orbits. The point at which the shocks appear and the streamlines shift between orbit families depends strongly on sound speed and resolution. For sufficiently large values of these two parameters, the transfer happens at the cusped orbit as hypothesised by Binney et al. over two decades ago. For sufficiently high resolutions the flow downstream of the shocks becomes unsteady. If this unsteadiness is physical, as appears to be the case, it provides a promising explanation for the asymmetry in the observed distribution of CO.

  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. Search for B^0-> p p-bar, Lambda Lambda-bar and B^+ -> p Lambda-bar at Belle

    E-Print Network [OSTI]

    Y. -T. Tsai; P. Chang

    2007-03-30T23:59:59.000Z

    We report on a new search for two-body baryonic decays of the B meson. Improved sensitivity compared to previous Belle results is obtained from 414 fb^-1 of data that corresponds to 449 million B B-bar pairs, which were taken on the Upsilon(4S) resonance and collected with the Belle detector at the KEKB e^+e^- collider. No significant signals are observed and we set the 90% confidence level upper limits: Br(B^0-> p pbar) Lambda Lambda-bar) p Lambda-bar) < 3.2X10^-7.

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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.

  18. 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

  19. 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 |

  20. The Influence of Bars on Nuclear Activity

    E-Print Network [OSTI]

    Luis C. Ho; Alexei V. Filippenko; Wallace L. W. Sargent

    1997-04-11T23:59:59.000Z

    We test ideas on fueling of galactic nuclei by bar-driven inflow by comparing the detection rate and intensity of nuclear H II regions and AGNs among barred and unbarred galaxies in a sample of over 300 spirals selected from our recent optical spectroscopic survey of nearby galaxies. Among late-type spirals (Sc-Sm), but not early-type (S0/a-Sbc), we observe in the barred group a very marginal increase in the detection rate of H II nuclei and a corresponding decrease in the incidence of AGNs. The minor differences in the detection rates, however, are statistically insignificant, most likely stemming from selection effects and not from a genuine influence from the bar. The presence of a bar seems to have no noticeable impact on the likelihood of a galaxy to host either nuclear star formation or an AGN. The nuclei of early-type barred spirals do exhibit measurably higher star-formation rates than their unbarred counterparts, as indicated by either the luminosity or the equivalent width of H-alpha emission. By contrast, late-type spirals do not show such an effect. Bars have a negligible effect on the strength of the AGNs in our sample, regardless of the Hubble type of the host galaxy. This result confirms similar conclusions reached by other studies based on much smaller samples.

  1. DOE's General Counsel Determines Sudan Act Does Not Bar Areva...

    Office of Environmental Management (EM)

    DOE's General Counsel Determines Sudan Act Does Not Bar Areva Enrichment Services LLC Loan Application DOE's General Counsel Determines Sudan Act Does Not Bar Areva Enrichment...

  2. 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.

  3. 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.

  4. 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.

  5. 2Cosmic Bar Graphs Galaxy Type

    E-Print Network [OSTI]

    in the cluster are spirals? Problem 2 ­ Gamma-ray bursts happen about once each day. The bar graph to the right there are 160 total galaxies, the fraction of spirals is 137/160 = 0.86, or equivalently 86%. Problem 2 ­ Gamma-ray2Cosmic Bar Graphs 0 20 40 60 80 100 S E SB I Galaxy Type Number 0 200 400 600 800 1000 FB SB Burst

  6. 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.

  7. 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.

  8. 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.

  9. Branching fractions for chi_cJ -> p p-bar pi^0, p p-bar eta, and p p-bar omega

    E-Print Network [OSTI]

    CLEO Collaboration; P. U. E. Onyisi; J. L. Rosner; J. P. Alexander; D. G. Cassel; S. Das; R. Ehrlich; L. Fields; L. Gibbons; S. W. Gray; D. L. Hartill; B. K. Heltsley; J. M. Hunt; D. L. Kreinick; V. E. Kuznetsov; J. Ledoux; J. R. Patterson; D. Peterson; D. Riley; A. Ryd; A. J. Sadoff; X. Shi; W. M. Sun; J. Yelton; P. Rubin; N. Lowrey; S. Mehrabyan; M. Selen; J. Wiss; S. Adams; M. Kornicer; R. E. Mitchell; M. R. Shepherd; C. M. Tarbert; D. Besson; T. K. Pedlar; J. Xavier; D. Cronin-Hennessy; J. Hietala; P. Zweber; S. Dobbs; Z. Metreveli; K. K. Seth; T. Xiao; A. Tomaradze; S. Brisbane; J. Libby; L. Martin; A. Powell; P. Spradlin; G. Wilkinson; H. Mendez; J. Y. Ge; D. H. Miller; I. P. J. Shipsey; B. Xin; G. S. Adams; D. Hu; B. Moziak; J. Napolitano; K. M. Ecklund; J. Insler; H. Muramatsu; C. S. Park; E. H. Thorndike; F. Yang; S. Ricciardi; C. Thomas; M. Artuso; S. Blusk; R. Mountain; T. Skwarnicki; S. Stone; J. C. Wang; L. M. Zhang; G. Bonvicini; D. Cinabro; A. Lincoln; M. J. Smith; P. Zhou; J. Zhu; P. Naik; J. Rademacker; D. M. Asner; K. W. Edwards; J. Reed; K. Randrianarivony; A. N. Robichaud; G. Tatishvili; E. J. White; R. A. Briere; H. Vogel

    2010-05-28T23:59:59.000Z

    Using a sample of 25.9 million psi(2S) decays acquired with the CLEO-c detector at the CESR e^+e^- collider, we report branching fractions for the decays chi_cJ -> p p-bar pi^0, p p-bar eta, and p p-bar omega, with J=0,1,2. Our results for B(chi_cJ-> p p-bar pi^0) and B(chi_cJ-> p p-bar eta) are consistent with, but more precise than, previous measurements. Furthermore, we include the first measurement of B(chi_cJ-> p p-bar omega).

  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. 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...

  12. 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.

  13. 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.

  14. 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...

  15. 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).

  16. 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 ...

  17. 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 ...

  18. 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

  19. 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.

  20. 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.

  1. 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

  2. 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.

  3. 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.

  4. 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.

  5. 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...

  6. 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...

  7. 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.

  8. 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.

  9. CP Asymmetries in bar B -> bar K* (-> bar K pi) l+ l- and Untagged bar B_s,B_s -> phi (-> K+ K-) l+ l- Decays at NLO

    E-Print Network [OSTI]

    Christoph Bobeth; Gudrun Hiller; Giorgi Piranishvili

    2008-07-22T23:59:59.000Z

    The decay bar B -> bar K* (-> bar K pi) l+ l- offers great opportunities to explore the physics at and above the electroweak scale by means of an angular analysis. We investigate the physics potential of the seven CP asymmetries plus the asymmetry in the rate, working at low dilepton mass using QCD factorization at next-to leading order (NLO). The b ->s CP asymmetries are doubly Cabibbo-suppressed \\lesssim 1 % in the Standard Model and its extensions where the CKM matrix is the only source of CP violation. Three CP asymmetries are T-odd, and can be O(1) in the presence of non-standard CP violation. The T-even asymmetries can reach O(0.1), limited by the small strong phases in the large recoil region. We furthermore point out an easy way to measure CP phases from time-integrated, untagged bar B_d, B_d -> K* (-> K0 pi0) l+ l- and bar B_s,B_s -> phi (-> K+ K-) l+ l- decays. Analyses of these CP asymmetries can rule out, or further support the minimal description of CP violation through the CKM mechanism. Experimental studies are promising for (super) flavor factories and at hadron colliders.

  10. Gas Feedback on Stellar Bar Evolution

    E-Print Network [OSTI]

    Ingo Berentzen; Isaac Shlosman; Inma Martinez-Valpuesta; Clayton Heller

    2007-05-27T23:59:59.000Z

    We analyze evolution of live disk-halo systems in the presence of various gas fractions, f_gas less than 8% in the disk. We addressed the issue of angular momentum (J) transfer from the gas to the bar and its effect on the bar evolution. We find that the weakening of the bar, reported in the literature, is not related to the J-exchange with the gas, but is caused by the vertical buckling instability in the gas-poor disks and by a steep heating of a stellar velocity dispersion by the central mass concentration (CMC) in the gas-rich disks. The gas has a profound effect on the onset of the buckling -- larger f_gas brings it forth due to the more massive CMCs. The former process leads to the well-known formation of the peanut-shaped bulges, while the latter results in the formation of progressively more elliptical bulges, for larger f_gas. The subsequent (secular) evolution of the bar differs -- the gas-poor models exhibit a growing bar while gas-rich models show a declining bar whose vertical swelling is driven by a secular resonance heating. The border line between the gas-poor and -rich models lies at f_gas ~ 3% in our models, but is model-dependent and will be affected by additional processes, like star formation and feedback from stellar evolution. The overall effect of the gas on the evolution of the bar is not in a direct J transfer to the stars, but in the loss of J by the gas and its influx to the center that increases the CMC. The more massive CMC damps the vertical buckling instability and depopulates orbits responsible for the appearance of peanut-shaped bulges. The action of resonant and non-resonant processes in gas-poor and gas-rich disks leads to a converging evolution in the vertical extent of the bar and its stellar dispersion velocities, and to a diverging evolution in the bulge properties.

  11. Track Finding Efficiency in BaBar

    E-Print Network [OSTI]

    T. Allmendinger; B. Bhuyan; D. N. Brown; H. Choi; S. Christ; R. Covarelli; M. Davier; A. G. Denig; M. Fritsch; A. Hafner; R. Kowalewski; O. Long; A. M. Lutz; M. Martinelli; D. R. Muller; I. M. Nugent; D. Lopes Pegna; M. V. Purohit; E. Prencipe; J. M. Roney; G. Simi; E. P. Solodov; A. V. Telnov; E. Varnes; R. Waldi; W. F. Wang; R. M. White

    2012-07-12T23:59:59.000Z

    We describe several studies to measure the charged track reconstruction efficiency and asymmetry of the BaBar detector. The first two studies measure the tracking efficiency of a charged particle using $\\tau$ and initial state radiation decays. The third uses the $\\tau$ decays to study the asymmetry in tracking, the fourth measures the tracking efficiency for low momentum tracks, and the last measures the reconstruction efficiency of $K_S^0$ particles. The first section also examines the stability of the measurements vs BaBar running periods.

  12. Observation of B+ --> K0bar K+ and B0 --> K0 K0bar

    E-Print Network [OSTI]

    The BABAR Collaboration; B. Aubert

    2006-10-25T23:59:59.000Z

    We report observations of the b --> d penguin-dominated decays B+ --> K0bar K+ and B0 --> K0 K0bar in approximately 350 million Upsilon(4S) --> BBbar decays collected with the BaBar detector. We measure the branching fractions B(B+ --> K0bar K+) = (1.61 +/- 0.44 +/- 0.09) * 10^-6 and B(B0 --> K0 K0bar) = (1.08 +/- 0.28 +/- 0.11) * 10^-6, and the CP-violating charge asymmetry A_{CP}(K0bar K+) = 0.10 +/- 0.26 +/- 0.03. Using a vertexing technique previously employed in several analyses of all-neutral final states containing kaons, we report the first measurement of time-dependent CP-violating asymmetries in B0 --> K0 K0bar, obtaining S = -1.28 +0.80/-0.73 +0.11/-0.16 and C = -0.40 +/- 0.41 +/- 0.06. We also report improved measurements of the branching fraction B(B+ --> K0 pi+) = (23.9 +/- 1.1 +/- 1.0) * 10^-6 and CP-violating charge asymmetry A_{CP}(K0 pi+) = -0.029 +/- 0.039 +/- 0.010.

  13. 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...

  14. 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

  15. Honey of a Pumpkin Bar Ingredients

    E-Print Network [OSTI]

    Liskiewicz, Maciej

    Honey of a Pumpkin Bar Ingredients: Non stick cooking spray 1/3 cup nonfat dry milk 2 cups whole. In a small bowl, combine dry milk, flour, baking soda, and spices. Set aside. 3. In a large bowl, thoroughly brown and cake springs back when lightly touched with your finger. 6. Cool. Cut into squares. Equipment

  16. 2011 Vibrations -1 VIBRATION OF PLATES & BARS

    E-Print Network [OSTI]

    Glashausser, Charles

    of plates of different shapes using Chladni patterns. APPARATUS: Function generator in FFTSCOPE, long and short flat bars, Chladni plates, salt, salt trays INTRODUCTION he equations of vibrational motion. The solutions become very complicated for the free boundary condition at the perimeter of the plate. The Chladni

  17. Study of psi(2S) Decays to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} and Search for p bar{p} Threshold Enhancements

    E-Print Network [OSTI]

    CLEO Collaboration; J. P. Alexander; D. G. Cassel; S. Das; R. Ehrlich; L. Fields; L. Gibbons; S. W. Gray; D. L. Hartill; B. K. Heltsley; D. L. Kreinick; V. E. Kuznetsov; J. R. Patterson; D. Peterson; D. Riley; A. Ryd; A. J. Sadoff; X. Shi; W. M. Sun; J. Yelton; P. Rubin; N. Lowrey; S. Mehrabyan; M. Selen; J. Wiss; S. Adams; M. Kornicer; R. E. Mitchell; M. R. Shepherd; C. M. Tarbert; D. Besson; T. K. Pedlar; J. Xavier; D. Cronin-Hennessy; J. Hietala; P. Zweber; S. Dobbs; Z. Metreveli; K. K. Seth; A. Tomaradze; T. Xiao; S. Brisbane; J. Libby; L. Martin; A. Powell; P. Spradlin; G. Wilkinson; H. Mendez; J. Y. Ge; D. H. Miller; I. P. J. Shipsey; B. Xin; G. S. Adams; D. Hu; B. Moziak; J. Napolitano; K. M. Ecklund; J. Insler; H. Muramatsu; C. S. Park; L. J. Pearson; E. H. Thorndike; F. Yang; S. Ricciardi; C. Thomas; M. Artuso; S. Blusk; R. Mountain; T. Skwarnicki; S. Stone; J. C. Wang; L. M. Zhang; G. Bonvicini; D. Cinabro; A. Lincoln; M. J. Smith; P. Zhou; J. Zhu; P. Naik; J. Rademacker; D. M. Asner; K. W. Edwards; K. Randrianarivony; G. Tatishvili; R. A. Briere; H. Vogel; P. U. E. Onyisi; J. L. Rosner

    2010-10-12T23:59:59.000Z

    The decays of psi(2S) into gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been studied with the CLEO-c detector using a sample of 24.5 million psi(2S) events obtained from e^+e^- annihilations at sqrt{s} = 3686 MeV. The data show evidence for the excitation of several N^* resonances in p pi^0 and p eta channels in pi^0 p bar{p} and eta p bar{p} decays, and f_2 states in gamma p bar{p} decay. Branching fractions for decays of psi(2S) to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been determined. No evidence for p bar{p} threshold enhancements was found in the reactions psi(2S)-> X p bar{p}, where X = gamma, pi^0, eta. We do, however, find confirming evidence for a p bar{p} threshold enhancement in J/psi-> gamma p bar{p} as previously reported by BES.

  18. 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

  19. 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.

  20. 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.

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. U.S. DEPARTMENT OF ENERGY - NETL CATEGORICAL EXCLUSION (CX) DESIGNATIO...

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

    62 South Coast Air Quality Mgmt Dist. EE UPS Ontario-Las Vegas LNG Corrid Vehicle Technology Division 2010 Mike Bednarz 12109 12312013 21865 Copley Drive, Diamond Bar, CA, 9176...

  13. U.S. DEPARTMENT OF ENERGY - NETL CATEGORICAL EXCLUSION (CX) DESIGNATIO...

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

    47 South Coast Air Quality Mgmt Dist. EE Heavy-Duty LNG Drayage Truck Prg Vehicle Technology Division 2010 Mike Bednarz 12109 12312013 21865 Copley Drive, Diamond Bar, CA, 9176...

  14. Measurement of the Branching Fraction for J/?-> p \\bar{p}?and p \\bar{p} ?^{'}

    E-Print Network [OSTI]

    BES collaboration

    2009-02-20T23:59:59.000Z

    Using 58$\\times 10^{6}$ $\\jpsi$ events collected with the Beijing Spectrometer (BESII) at the Beijing Electron Positron Collider (BEPC), the branching fractions of $\\jpsi$ to $p\\bar{p}\\eta$ and $p\\bar{p}\\etap$ are determined. The ratio $\\frac{\\Gamma(\\jpsi\\rar\\ppb\\eta)}{\\Gamma(\\jpsi\\rar\\ppb)}$ obtained by this analysis agrees with expectations based on soft-pion theorem calculations.

  15. 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.

  16. 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.

  17. 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.

  18. 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.

  19. 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.

  20. 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.

  1. SERVICEABILITY LIMIT STATES OF CONCRETE BEAMS PRESTRESSED BY CFRP BARS

    E-Print Network [OSTI]

    reinforcements. The experimental program consisted of testing eight concrete beams prestressed by CFRP bars beams prestressed by Leadline CFRP bars were tested, in addition to two concrete beams prestressedAbstract SERVICEABILITY LIMIT STATES OF CONCRETE BEAMS PRESTRESSED BY CFRP BARS by Amr A

  2. 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

  3. 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

  4. 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 $\\unit[190-240]{nm/min}$.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. Hadron Physics in BaBar

    SciTech Connect (OSTI)

    Lafferty, G.D.; /Manchester U.

    2005-08-29T23:59:59.000Z

    Some recent results in hadron physics from the BaBar experiment are discussed. In particular, the observation of two new charmed states, the D*{sub sJ}{sup +}(2317) and the D*{sub sJ}{sup +}(2457), is described, and results are presented on the first measurement of the rare decay mode of the B meson, B{sup 0} {pi}{sup 0}{pi}{sup 0}.

  10. New Spectroscopy at BaBar

    SciTech Connect (OSTI)

    Mazzoni, M.A.; /INFN, Rome

    2007-04-18T23:59:59.000Z

    The Babar experiment at the SLAC B factory has accumulated a high luminosity that offers the possibility of systematic studies of quarkonium spectroscopy and of investigating rare new phenomena. Recent results in this field are presented. In recent times spectroscopy has become exciting again, after the discovery of new states that are not easily explained by conventional models. States such as the X(3872) and the Y(4260) could be new excited charmonium states, but require precise measurements for positive identification. The BaBar experiment [1] is installed at the asymmetric storage ring PEP-II. 90% of the data accumulated by BaBar are taken at the Y(4S) (10.58 GeV) and 10% just below (10.54 GeV). The BaBar detector includes a 5-layer, double-sided silicon vertex tracker and a 40-layer drift chamber in a 1.5 T solenoidal magnetic field, which detect charged particles and measures their momenta and ionization energy losses. Photons, electrons, and neutral hadrons are detected with a CsI(Tl)-crystal electromagnetic calorimeter. An internally reflecting ring-imaging Cherenkov is also used for particle id. Penetrating muon and neutral hadrons are identified by an array of resistive-plate chambers embedded in the steel of the flux return. The detector allows good track and vertex resolution, good particle id and good photon detection so it is especially suited for spectroscopy studies.

  11. Diamond Energy Pty Ltd | 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 directedAnnualPropertyd8c-a9ae-f8521cbb8489 No revision hasda62829c05bGabbs TypeWinds Wind Farm Jump

  12. Diamond Willow Extension | 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 directedAnnualPropertyd8c-a9ae-f8521cbb8489 No revision hasda62829c05bGabbs TypeWinds Wind Farm JumpExtension

  13. 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.

  14. 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.

  15. 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.

  16. Gas flows and bars in galaxies

    E-Print Network [OSTI]

    F. Combes

    2006-08-29T23:59:59.000Z

    Dynamical evolution of spiral galaxies is strongly dependent on non-axisymmetric patterns that develop from gravitational instabilities, either spontaneously or externally triggered. Some evolutionary sequences are described through which a galaxy could possibly concentrate mass and build bulges, how external gas accretion from cosmic filaments could be funneled to the galaxy disks, and intermittently driven to the galaxy center, to form nuclear starbursts and fuel an active nucleus. The frequency of both bars and lopsidedness can be used to constrain the gas accretion rate.

  17. Bar Louie - 412.394.0500

    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 for4,645U.S. DOE Office511041cloth DocumentationProductsAlternativeOperationalAugustDecade5-F,INITIAL JohnE Pt he A dvanced LaBar

  18. B0-B0bar mixing

    E-Print Network [OSTI]

    Olivier Schneider

    2008-06-30T23:59:59.000Z

    The subject of particle-antiparticle mixing in the neutral B meson systems is reviewed. The formalism of B0-B0bar mixing is recalled and basic Standard Model predictions are given, before experimental issues are discussed and the latest combinations of experimental results on mixing parameters are presented, including those on mixing-induced CP violation, mass differences, and decay-width differences. Finally, time-integrated mixing results are used to improve our knowledge on the fractions of the various b-hadron species produced in Z decays and at high-energy colliders.

  19. B0-B0bar mixing

    E-Print Network [OSTI]

    Olivier Schneider

    2006-06-17T23:59:59.000Z

    The subject of particle-antiparticle mixing in the neutral B meson systems is reviewed. The formalism of B0-B0bar mixing is recalled and basic Standard Model predictions are given, before experimental issues are discussed and the latest combinations of experimental results on mixing parameters are presented, including those on mixing-induced CP violation, mass differences, and decay-width differences. Finally, time-integrated mixing results are used to improve our knowledge on the fractions of the various b-hadron species produced in Z decays and at high-energy colliders.

  20. Tennessee Nuclear Profile - Watts Bar Nuclear Plant

    U.S. Energy Information Administration (EIA) 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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5 Tables July 1996 Energy Information Administration Office ofthroughYear JanYear Jan Feb Mar Apr May Jun Jul AugSameWatts Bar Nuclear

  1. 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.

  2. Study of J?decaying into ?p \\bar p

    E-Print Network [OSTI]

    BES Collaboration

    2007-12-03T23:59:59.000Z

    The decay $J/\\psi \\to \\omega p \\bar p$ is studied using a $5.8 \\times 10^7$ $J/\\psi$ event sample accumulated with the BES II detector at the Beijing electron-positron collider. The decay branching fraction is measured to be $B(J/\\psi \\to \\omega p \\bar p)=(9.8\\pm 0.3\\pm 1.4)\\times 10^{-4}$. No significant enhancement near the $p\\bar p$ mass threshold is observed, and an upper limit of $B(J/\\psi \\to \\omega X(1860))B(X(1860)\\to p\\bar p)$$ $$p\\bar p$ mass spectrum in $J/\\psi \\to \\gamma p \\bar p$ decays.

  3. RED MOUNTAIN BAR PUMPED STOR AGE PR OJEC T Red Mountain Bar Pumped Storage Project

    E-Print Network [OSTI]

    Laughlin, Robert B.

    a pumped storage project to generate electricity during peak demand. The proposed Red Mountain Bar Pumped from a lower reservoir to an upper reservoir when demand and price for electricity is low. Water the next day. These projects are uniquely suited for generating power when demand for electricity is high

  4. Mass of Ca-36

    E-Print Network [OSTI]

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

    1977-01-01T23:59:59.000Z

    TABLE II. Coulomb energies for the A =36 isobaric quintet. The results are in good agree- ment with the calculations if the charge-dependent contributions are included. The uncertainties for the experimental results given in parentheses are in ke...V. Nuclide Calculated Coulomb contribution (keV) Including charge dependence (keV) Experimental "Cl "Ar 36K "Ca 6368 6681 6994 7307 6210 6628 7047 7465 6224(2) 6629(2) 7033(6) ' 7469(40) Based on the quadratic IMME prediction for the K...

  5. On the Lengths, Colours and Ages of Bars

    E-Print Network [OSTI]

    F. Combes; J. Palous; Dimitri A. Gadotti; Ronaldo E. De Souza

    2006-01-01T23:59:59.000Z

    Abstract. In an effort to obtain further observational evidences for secular evolution processes in galaxies, as well as observational constraints to current theoretical models of secular evolution, we have used BVRI and Ks images of a sample of 18 barred galaxies to measure the lengths and colours of bars, create colour maps and estimate global colour gradients. In addition, applying a method we developed in a previous article, we could distinguish for 7 galaxies in our sample those whose bars have been recently formed from the ones with already evolved bars. We estimated an average difference in the optical colours between young and evolved bars that may be translated to an age difference of the order of 10 Gyr, meaning that bars may be long standing structures. Moreover, our results show that, on average, evolved bars are longer than young bars. This seems to indicate that, during its evolution, a bar grows longer by capturing stars from the disk, in agreement with recent numerical and analytical results.

  6. Measurement of the B0-bar Lifetime and the B0B0-bar Oscillation Frequency Using Partially Reconstructed B0-bar to D*+ l- nu-bar Decays

    SciTech Connect (OSTI)

    Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Tisserand, V.; Zghiche, A.; /Annecy, LAPP; Grauges, E.; /Barcelona, IFAE; Palano, A.; Pappagallo, M.; Pompili, A.; /Bari U. /INFN, Bari; Chen, J.C.; Qi, N.D.; Rong, G.; Wang, P.; Zhu, Y.S.; /Beijing, Inst. High Energy Phys.; Eigen, G.; Ofte, I.; Stugu, B. /Bergen U. /LBL, Berkeley /UC, Berkeley /Birmingham U. /Ruhr U., Bochum /Bristol U. /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UCLA /UC, Riverside /UC, San

    2005-07-27T23:59:59.000Z

    The authors present a simultaneous measurement of the {bar B}{sup 0} lifetime {tau}{sub B{sup 0}} and B{sup 0}{bar B}{sup 0} oscillation frequency {Delta}m{sub d}. We use a sample of about 50,000 partially reconstructed {bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}{sub {ell}} decays identified with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring at SLAC. The flavor of the other B meson in the event is determined from the charge of another high-momentum lepton.

  7. 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.

  8. Measurement of the B-bar 0 to D^* l ^- nu-bar Branching Fraction with a Partial Reconstruction Technique

    SciTech Connect (OSTI)

    Sonnek, Peter; /Mississippi U.

    2009-12-17T23:59:59.000Z

    Presented is a precise measurement of the {bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}{sub {ell}} branching fraction using 81.47 fb{sup -1} of data collected with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring at the Stanford Linear Accelerator Center. The measurement was performed by partially reconstructing the D*{sup +} meson from {bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}{sub {ell}} decays using only the soft pion of the D*{sup +} {yields} D{sup 0}{pi}{sup +} decay to reconstruct its four vector. The branching fraction was measured to be {Beta}({bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}{sub {ell}}) = (4.91 {+-} 0.01{sub stat} {+-} 0.15{sub syst})%.

  9. Measurement of $?_{cJ}$ decaying into $p\\bar{n}?^{-}$ and $p\\bar{n}?^{-}?^{0}$

    E-Print Network [OSTI]

    M. Ablikim; M. N. Achasov; O. Albayrak; D. J. Ambrose; F. F. An; Q. An; J. Z. Bai; Y. Ban; J. Becker; J. V. Bennett; M. Bertani; J. M. Bian; E. Boger; O. Bondarenko; I. Boyko; R. A. Briere; V. Bytev; X. Cai; O. Cakir; A. Calcaterra; G. F. Cao; S. A. Cetin; J. F. Chang; G. Chelkov; G. Chen; H. S. Chen; J. C. Chen; M. L. Chen; S. J. Chen; X. Chen; Y. B. Chen; H. P. Cheng; Y. P. Chu; D. Cronin-Hennessy; H. L. Dai; J. P. Dai; D. Dedovich; Z. Y. Deng; A. Denig; I. Denysenko; M. Destefanis; W. M. Ding; Y. Ding; L. Y. Dong; M. Y. Dong; S. X. Du; J. Fang; S. S. Fang; L. Fava; F. Feldbauer; C. Q. Feng; R. B. Ferroli; C. D. Fu; J. L. Fu; Y. Gao; C. Geng; K. Goetzen; W. X. Gong; W. Gradl; M. Greco; M. H. Gu; Y. T. Gu; Y. H. Guan; A. Q. Guo; L. B. Guo; Y. P. Guo; Y. L. Han; F. A. Harris; K. L. He; M. He; Z. Y. He; T. Held; Y. K. Heng; Z. L. Hou; H. M. Hu; T. Hu; G. M. Huang; G. S. Huang; J. S. Huang; X. T. Huang; Y. P. Huang; T. Hussain; C. S. Ji; Q. Ji; Q. P. Ji; X. B. Ji; X. L. Ji; L. L. Jiang; X. S. Jiang; J. B. Jiao; Z. Jiao; D. P. Jin; S. Jin; F. F. Jing; N. Kalantar-Nayestanaki; M. Kavatsyuk; W. Kuehn; W. Lai; J. S. Lange; C. H. Li; Cheng Li; Cui Li; D. M. Li; F. Li; G. Li; H. B. Li; J. C. Li; K. Li; Lei Li; Q. J. Li; S. L. Li; W. D. Li; W. G. Li; X. L. Li; X. N. Li; X. Q. Li; X. R. Li; Z. B. Li; H. Liang; Y. F. Liang; Y. T. Liang; G. R. Liao; X. T. Liao; B. J. Liu; C. L. Liu; C. X. Liu; C. Y. Liu; F. H. Liu; Fang Liu; Feng Liu; H. Liu; H. H. Liu; H. M. Liu; H. W. Liu; J. P. Liu; K. Y. Liu; Kai Liu; P. L. Liu; Q. Liu; S. B. Liu; X. Liu; Y. B. Liu; Z. A. Liu; Zhiqiang Liu; Zhiqing Liu; H. Loehner; G. R. Lu; H. J. Lu; J. G. Lu; Q. W. Lu; X. R. Lu; Y. P. Lu; C. L. Luo; M. X. Luo; T. Luo; X. L. Luo; M. Lv; C. L. Ma; F. C. Ma; H. L. Ma; Q. M. Ma; S. Ma; T. Ma; X. Y. Ma; Y. Ma; F. E. Maas; M. Maggiora; Q. A. Malik; Y. J. Mao; Z. P. Mao; J. G. Messchendorp; J. Min; T. J. Min; R. E. Mitchell; X. H. Mo; C. Morales Morales; C. Motzko; N. Yu. Muchnoi; H. Muramatsu; Y. Nefedov; C. Nicholson; I. B. Nikolaev; Z. Ning; S. L. Olsen; Q. Ouyang; S. Pacetti; J. W. Park; M. Pelizaeus; H. P. Peng; K. Peters; J. L. Ping; R. G. Ping; R. Poling; E. Prencipe; M. Qi; S. Qian; C. F. Qiao; X. S. Qin; Y. Qin; Z. H. Qin; J. F. Qiu; K. H. Rashid; G. Rong; X. D. Ruan; A. Sarantsev; B. D. Schaefer; J. Schulze; M. Shao; C. P. Shen; X. Y. Shen; H. Y. Sheng; M. R. Shepherd; X. Y. Song; S. Spataro; B. Spruck; D. H. Sun; G. X. Sun; J. F. Sun; S. S. Sun; Y. J. Sun; Y. Z. Sun; Z. J. Sun; Z. T. Sun; C. J. Tang; X. Tang; I. Tapan; E. H. Thorndike; D. Toth; M. Ullrich; G. S. Varner; B. Wang; B. Q. Wang; D. Wang; D. Y. Wang; K. Wang; L. L. Wang; L. S. Wang; M. Wang; P. Wang; P. L. Wang; Q. Wang; Q. J. Wang; S. G. Wang; X. L. Wang; Y. D. Wang; Y. F. Wang; Y. Q. Wang; Z. Wang; Z. G. Wang; Z. Y. Wang; D. H. Wei; J. B. Wei; P. Weidenkaff; Q. G. Wen; S. P. Wen; M. Werner; U. Wiedner; L. H. Wu; N. Wu; S. X. Wu; W. Wu; Z. Wu; L. G. Xia; Z. J. Xiao; Y. G. Xie; Q. L. Xiu; G. F. Xu; G. M. Xu; H. Xu; Q. J. Xu; X. P. Xu; Z. R. Xu; F. Xue; Z. Xue; L. Yan; W. B. Yan; Y. H. Yan; H. X. Yang; Y. Yang; Y. X. Yang; H. Ye; M. Ye; M. H. Ye; B. X. Yu; C. X. Yu; H. W. Yu; J. S. Yu; S. P. Yu; C. Z. Yuan; Y. Yuan; A. A. Zafar; A. Zallo; Y. Zeng; B. X. Zhang; B. Y. Zhang; C. Zhang; C. C. Zhang; D. H. Zhang; H. H. Zhang; H. Y. Zhang; J. Q. Zhang; J. W. Zhang; J. Y. Zhang; J. Z. Zhang; S. H. Zhang; X. J. Zhang; X. Y. Zhang; Y. Zhang; Y. H. Zhang; Y. S. Zhang; Z. P. Zhang; Z. Y. Zhang; G. Zhao; H. S. Zhao; J. W. Zhao; K. X. Zhao; Lei Zhao; Ling Zhao; M. G. Zhao; Q. Zhao; Q. Z. Zhao; S. J. Zhao; T. C. Zhao; X. H. Zhao; Y. B. Zhao; Z. G. Zhao; A. Zhemchugov; B. Zheng; J. P. Zheng; Y. H. Zheng; B. Zhong; J. Zhong; Z. Zhong; L. Zhou; X. K. Zhou; X. R. Zhou; C. Zhu; K. Zhu; K. J. Zhu; S. H. Zhu; X. L. Zhu; Y. C. Zhu; Y. M. Zhu; Y. S. Zhu; Z. A. Zhu; J. Zhuang; B. S. Zou; J. H. Zou

    2012-09-27T23:59:59.000Z

    Using a data sample of $1.06 \\times 10^{8}$ $\\psip$ events collected with the BESIII detector in 2009, the branching fractions of $\\chi_{cJ}\\to p\\bar{n}\\pi^{-}$ and $\\chi_{cJ}\\to p\\bar{n}\\pi^{-}\\pi^{0}$ ($J$=0,1,2) are measured{Throughout the text, inclusion of charge conjugate modes is implied if not stated otherwise.}. The results for $\\chi_{c0}\\to p\\bar{n}\\pi^{-}$ and $\\chi_{c2}\\to p\\bar{n}\\pi^{-}$ are consistent with, but much more precise than those of previous measurements. The decays of $\\chi_{c1}\\to p\\bar{n}\\pi^{-}$ and $\\chi_{cJ}\\to p\\bar{n}\\pi^{-}\\pi^{0}$ are observed for the first time.

  10. Resonant final-state interactions in D^0 -> \\bar{K}^{0} ?, \\bar{K}^{0} ?' Decay

    E-Print Network [OSTI]

    El aaoud El hassan; A. N. Kamal

    1999-10-13T23:59:59.000Z

    We have investimated the effect of the isospin 1/2, J^P = 0^+ resonant state K^*_0(1950) on the decays D^0 ->\\bar{K}^{0}\\eta and D^0 ->\\bar{K}^0 \\eta' as a function of the branching ratio sum r =Br(K^*_0(1950)->\\bar{K}^0\\eta)+ Br(K^*_0(1950)->\\bar{K}^0 \\eta' and coupling constants g_{K^*_0\\bar{K}^0\\eta}, g_{K^*_0\\bar{K}^0\\eta'}. We have used a factorized input for D^0 -> K^*_0(1950) weak transition through a \\pi K loop. We estimated both on- and off-shell contributions from the loop. Our calculation shows that the off-shell effects are significant. For $r\\geq 30%$ a fit to the decay amplitude A(D^0 -> \\bar{K}^0 \\eta') was possible, but the amplitude A(D^0 ->\\bar{K}^0 \\eta) remained at its factorized value. For small values of r, $r\\leq 18 %$, we were able to fit A(D^0 -> \\bar{K}^0 \\eta), and despite the fact that A(D^0 -> \\bar{K}^0 \\eta') could be raised by almost 100 % over its factorized value, it still falls short of its experimental value. A simultaneous fit to both amplitudes A(D^0 -> \\bar{K}^0 \\eta') and A(D^0 -> \\bar{K}^0 \\eta) was not possible. We have also determined the strong phase of the resonant amplitudes for both decays. PACS numbers:13.25.Ft, 13.25.-k, 14.40.Lb

  11. First Measurement of the t(t) over bar Differential Cross Section d sigma/dM(t(t) over bar) in p(p) over bar Collisions at root s=1.96 TeV

    E-Print Network [OSTI]

    Paus, Christoph M. E.

    We present a measurement of the t(t) over bar differential cross section with respect to the t(t) over bar invariant mass, d sigma/dM(t(t) over bar), in p(p) over bar collisions at ?s=1.96??TeV using an integrated ...

  12. 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.

  13. 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.

  14. 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...

  15. 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.

  16. 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...

  17. 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.

  18. 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.

  19. 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

  20. 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.

  1. 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...

  2. 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.

  3. Bus bar electrical feedthrough for electrorefiner system

    DOE Patents [OSTI]

    Williamson, Mark; Wiedmeyer, Stanley G; Willit, James L; Barnes, Laurel A; Blaskovitz, Robert J

    2013-12-03T23:59:59.000Z

    A bus bar electrical feedthrough for an electrorefiner system may include a retaining plate, electrical isolator, and/or contact block. The retaining plate may include a central opening. The electrical isolator may include a top portion, a base portion, and a slot extending through the top and base portions. The top portion of the electrical isolator may be configured to extend through the central opening of the retaining plate. The contact block may include an upper section, a lower section, and a ridge separating the upper and lower sections. The upper section of the contact block may be configured to extend through the slot of the electrical isolator and the central opening of the retaining plate. Accordingly, relatively high electrical currents may be transferred into a glovebox or hot-cell facility at a relatively low cost and higher amperage capacity without sacrificing atmosphere integrity.

  4. Availability Bars for Calendar Scheduling AbstractAndrew Faulring

    E-Print Network [OSTI]

    Myers, Brad A.

    Availability Bars for Calendar Scheduling AbstractAndrew Faulring Carnegie Mellon University 5000 meeting or to what extent an existing meeting can be rescheduled. This paper introduces the "availability. Availability bars, embedded in calendar applications, can help users who manually schedule meetings

  5. Bar Chart Ball, a Data Game Julian Togelius

    E-Print Network [OSTI]

    Togelius, Julian

    Bar Chart Ball, a Data Game Julian Togelius IT University of Copenhagen Rued Langgaards Vej 7 2300 19 Malmö, Sweden marie.friberger@mah.se ABSTRACT We describe Bar Chart Ball, a game where players to focus on. By making data selection a core game mechanic, in fact the only game mechanic, we advance

  6. Partial entrainment of gravel bars during floods Christopher P. Konrad

    E-Print Network [OSTI]

    Montgomery, David R.

    tracer particles and bed load samplers have demonstrated that partial entrain- ment rather than completePartial entrainment of gravel bars during floods Christopher P. Konrad U.S. Geological Survey a gravel bar during a flood, or partial entrainment, had an approximately normal distribution with respect

  7. Practical Performance Model for Bar Buckling Michael P. Berry1

    E-Print Network [OSTI]

    Eberhard, Marc O.

    Practical Performance Model for Bar Buckling Michael P. Berry1 and Marc O. Eberhard2 Abstract: A practical model has been developed to predict, for a given level of lateral deformation, the likelihood that longitudinal bars in a reinforced concrete column will have begun to buckle. Three relationships linking

  8. TOUGH2/EOS7CA

    Energy Science and Technology Software Center (OSTI)

    003504MLTPL00 EOS7CA Version 1.0: TOUGH2 Module for Gas Migration in Shallow Subsurface Porous Media Systems   

  9. Applying Schwarzschild's orbit superposition method to barred or non-barred disc galaxies

    E-Print Network [OSTI]

    Vasiliev, Eugene

    2015-01-01T23:59:59.000Z

    We present an implementation of the Schwarzschild orbit superposition method which can be used for constructing self-consistent equilibrium models of barred or non-barred disc galaxies, or of elliptical galaxies with figure rotation. This is a further development of the publicly available code SMILE; its main improvements include a new efficient representation of an arbitrary gravitational potential using two-dimensional spline interpolation of Fourier coefficients in the meridional plane, as well as the ability to deal with rotation of the density profile and with multicomponent mass models. We compare several published methods for constructing composite axisymmetric disc--bulge--halo models and demonstrate that our code produces the models that are closest to equilibrium. We also apply it to create models of triaxial elliptical galaxies with cuspy density profiles and figure rotation, and find that such models can be found and are stable over many dynamical times in a wide range of pattern speeds and angula...

  10. 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.

  11. 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

  12. Study of $B\\to p\\bar{p}K^*$ and $B\\to p\\bar{p}?$

    E-Print Network [OSTI]

    C. Q. Geng; Y. K. Hsiao; J. N. Ng

    2007-04-20T23:59:59.000Z

    We study the three-body baryonic B decays of $B\\to p\\bar{p}(K^{*},\\rho)$ in the standard model. The baryonic matrix elements are calculated in terms of the SU(3) flavor symmetry and the QCD power counting rules within the the perturbative QCD. We find that the decay branching ratios, angular and direct CP asymmetries of ($B^{-}\\to p\\bar{p}K^{*-}, \\bar{B}^{0}\\to p\\bar{p}K^{*0}, B^{-}\\to p\\bar{p}\\rho^{-}$) are around $(6,1,30)\\times 10^{-6}$, $(13,-27,11)%$ and $(22,1,-3)%$, which are consistent with the current BaBar and Belle data, respectively. The large values of the branching ratio in $B^{-}\\to p\\bar{p}\\rho^{-}$ and the direct CP asymmetry in $B^{\\pm}\\to p\\bar{p}K^{*\\pm}$ are useful to test the standard model and search for new physics.

  13. tt-bar production cross section in pp-bar collisions at s?=1.8TeV

    E-Print Network [OSTI]

    Baringer, Philip S.; Bean, Alice; Coppage, Don; Hebert, C.; Abazov, V. M.; Abbott, B.; Abdesselam, A.; Abolins, M.; Abramov, V.; Acharya, B. S.

    2003-01-15T23:59:59.000Z

    Results are presented on a measurement of the tt-bar pair production cross section in pp-bar collisions at s?=1.8TeV from nine independent decay channels. The data were collected by the DØ experiment during the 1992–1996 run of the Fermilab Tevatron...

  14. Measurement of light capture in solar cells from silver- and tin-plated patterned bus bars

    E-Print Network [OSTI]

    Winiarz, Christine Eve

    2007-01-01T23:59:59.000Z

    Bus bars on solar cells shade silicon from light. When the bus bars are patterned, they can reflect light back onto the silicon using total internal reflection. These patterned bus bars are tin plated and produce 1-2.5% ...

  15. Variation of Galactic Bar Length with Amplitude and Density as Evidence for Bar Growth over a Hubble Time

    E-Print Network [OSTI]

    Elmegreen, Bruce G; Knapen, Johan H; Buta, Ronald J; Block, David L; Puerari, Ivanio

    2007-01-01T23:59:59.000Z

    K_s-band images of 20 barred galaxies show an increase in the peak amplitude of the normalized m=2 Fourier component with the R_25-normalized radius at this peak. This implies that longer bars have higher $m=2$ amplitudes. The long bars also correlate with an increased density in the central parts of the disks, as measured by the luminosity inside 0.25R_25 divided by the cube of this radius in kpc. Because denser galaxies evolve faster, these correlations suggest that bars grow in length and amplitude over a Hubble time with the fastest evolution occurring in the densest galaxies. All but three of the sample have early-type flat bars; there is no clear correlation between the correlated quantities and the Hubble type.

  16. Variation of Galactic Bar Length with Amplitude and Density as Evidence for Bar Growth over a Hubble Time

    E-Print Network [OSTI]

    Bruce G. Elmegreen; Debra Meloy Elmegreen; Johan H. Knapen; Ronald J. Buta; David L. Block; Ivanio Puerari

    2007-11-20T23:59:59.000Z

    K_s-band images of 20 barred galaxies show an increase in the peak amplitude of the normalized m=2 Fourier component with the R_25-normalized radius at this peak. This implies that longer bars have higher $m=2$ amplitudes. The long bars also correlate with an increased density in the central parts of the disks, as measured by the luminosity inside 0.25R_25 divided by the cube of this radius in kpc. Because denser galaxies evolve faster, these correlations suggest that bars grow in length and amplitude over a Hubble time with the fastest evolution occurring in the densest galaxies. All but three of the sample have early-type flat bars; there is no clear correlation between the correlated quantities and the Hubble type.

  17. 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

  18. 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

  19. 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

  20. 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

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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.

  13. 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.

  14. 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

  15. Bar-Halo Friction in Galaxies II: Metastability

    E-Print Network [OSTI]

    J. A. Sellwood; Victor P. Debattista

    2005-11-05T23:59:59.000Z

    It is well-established that strong bars rotating in dense halos generally slow down as they lose angular momentum to the halo through dynamical friction. Angular momentum exchanges between the bar and halo particles take place at resonances. While some particles gain and others lose, friction arises when there is an excess of gainers over losers. This imbalance results from the generally decreasing numbers of particles with increasing angular momentum, and friction can therefore be avoided if there is no gradient in the density of particles across the major resonances. Here we show that anomalously weak friction can occur for this reason if the pattern speed of the bar fluctuates upwards. After such an event, the density of resonant halo particles has a local inflexion created by the earlier exchanges, and bar slowdown can be delayed for a long period; we describe this as a metastable state. We show that this behavior in purely collisionless N-body simulations is far more likely to occur in methods with adaptive resolution. We also show that the phenomenon could arise in nature, since bar-driven gas inflow could easily raise the bar pattern speed enough to reach the metastable state. Finally, we demonstrate that mild external, or internal, perturbations quickly restore the usual frictional drag, and it is unlikely therefore that a strong bar in a galaxy having a dense halo could rotate for a long period without friction.

  16. 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.

  17. 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.

  18. Telescoping magnetic ball bar test gage

    DOE Patents [OSTI]

    Bryan, J.B.

    1982-03-15T23:59:59.000Z

    A telescoping magnetic ball bar test gage for determining the accuracy of machine tools, including robots, and those measuring machines having non-disengagable servo drives which cannot be clutched out. Two gage balls are held and separated from one another by a telescoping fixture which allows them relative radial motional freedom but not relative lateral motional freedom. The telescoping fixture comprises a parallel reed flexure unit and a rigid member. One gage ball is secured by a magnetic socket knuckle assembly which fixes its center with respect to the machine being tested. The other gage ball is secured by another magnetic socket knuckle assembly which is engaged or held by the machine in such manner that the center of that ball is directed to execute a prescribed trajectory, all points of which are equidistant from the center of the fixed gage ball. As the moving ball executes its trajectory, changes in the radial distance between the centers of the two balls caused by inaccuracies in the machine are determined or measured by a linear variable differential transformer (LVDT) assembly actuated by the parallel reed flexure unit. Measurements can be quickly and easily taken for multiple trajectories about several different fixed ball locations, thereby determining the accuracy of the machine.

  19. 2D spectroscopy of double-barred galaxies

    E-Print Network [OSTI]

    A. V. Moiseev; J. R. Valdes; V. H. Chavushyan

    2002-02-13T23:59:59.000Z

    The first results of the observational program of the study of 2D-kinematics in double-barred galaxies are presented. We show that, for the main part of the sample, the inner bars do not affect the circumnuclear stellar kinematics. Therefore, they are not dynamically decoupled structures. Various types of non-circular gas motion were found in many galaxies. The analysis of the ground-based and HST optical and NIR images reveals mini-spirals in about half of the investigated objects. We suggest that so called ``double-barred galaxies'' are, in fact, galaxies with very different circumnuclear structure.

  20. Production of htt_bar and htT_bar in littlest Higgs model with T-parity

    E-Print Network [OSTI]

    Lei Wang; Wenyu Wang; Jin Min Yang; Huanjun Zhang

    2007-03-22T23:59:59.000Z

    In the littlest Higgs model with T-parity, which predicts a pair of T-even and T-odd partners for the top quark, the top quark interactions are altered with respect to the Standard Model predictions and deviation will manifest in various top quark processes. In this work we examine the effects in htt_bar productions at the ILC and LHC. We find that in the allowed parameter space, the cross sections can be significantly deviated from the Standard Model predictions and thus provide a good test for the littlest Higgs model with T-parity. We also examine the new production channel, the htT_bar or hTt_bar production, at the LHC, which give the same final states as htt_bar production due to the dominant decay T->Wb. We find that, compared with htt_bar production, this new production channel can have a sizable production rate for a T-quark below TeV scale. Such a production will be counted into htt_bar events or possibly extracted from htt_bar events, depending on if we can distinguish the T-quark from the top quark from mass reconstructions.

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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:

  7. 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

  8. Review Essay of Dorit Bar-On's Speaking My Mind

    E-Print Network [OSTI]

    Byrne, Alex

    “Avowals” are utterances that “ascribe [current] states of mind”; for instance utterances of ‘I have a terrible headache’ and ‘I’m finding this painting utterly puzzling’ (Bar-On 2004: 1). And avowals, “when compared to ...

  9. Technical Analysis of Commodity Markets: Emphasis on Bar Charts 

    E-Print Network [OSTI]

    Purcell, Wayne D.

    1999-07-12T23:59:59.000Z

    Technical analysis of futures markets can be complex, but this publication explains fairly simple methods of using bar charts to predict price trends. Understanding resistance and support planes, chart gaps and other signals can equip producers...

  10. Ca2+ dependant synaptic modification

    E-Print Network [OSTI]

    Huh, Dongsung, 1981-

    2004-01-01T23:59:59.000Z

    It has been assumed that Ca2+ influx of different duration and amplitude would generate different level of potentiation. The conventional protocols of generating LTP have been 1. tetanic stimulation of presynaptic cell, ...

  11. Measurement of D0-D0bar Mixing and CP Violation at BaBar

    E-Print Network [OSTI]

    Giulia Casarosa; for the BaBar Collaboration

    2012-08-31T23:59:59.000Z

    We report on a measurement of D0-D0bar mixing and a search for CP violation in the D0->K+K-, pi+pi- and K+-pi-+ channels. We use D0's coming from D*+ decays, so that the flavour of the D0 at production is tagged by the charge of the pion that is also emitted. We also use an independent set of D0's coming directly from the hadronization of the charm quark, but in this case the flavour of the charmed meson is not known. We analyze events collected by the BaBar experiment at the PEP-II asymmetric-energy e+e- collider, corresponding to an integrated luminosity of 468 fb-1. We measure the mixing parameter value to be yCP = [0.72 +- 0.18 (stat) +- 0.12 (syst)]%, and exclude the no-mixing hypothesis at 3.3sigma significance. We find no evidence of CP violation, observing DeltaY = [0.09 +- 0.26 (stat) +- 0.06 syst)]% which is consistent with zero.

  12. The Distribution of Barred Galaxies in the Virgo Cluster

    E-Print Network [OSTI]

    Victor Andersen

    1996-03-22T23:59:59.000Z

    A study of the distribution of barred and nonbarred disk galaxies in the Virgo cluster is presented in an attempt to use the frequency and spatial distribution of galaxies with specific morphological features to study the efficiency of various environmental effects on the evolution of disk galaxies in clusters. The velocity distribution of the barred spirals in the Virgo region is clearly different than that of the nonbarred spirals, suggesting that barred spirals are more common in the main condensation of the cluster. A sample cleansed of galaxies not belonging to the main cluster condensation using the subcluster assignments of Binggeli et al. [A&AS, 98, 275 (1993)] bears this out, showing that the radial distribution of barred spirals is more centrally condensed than that of nonbarred spirals. In contrast to the spiral galaxies, the distribution of barred S0 galaxies is statistically indistinguishable from that of nonbarred S0's. Consideration of the level of tidal perturbation due to the cluster mass distribution as compared to that due to individual galaxies suggests that tidal triggering by the cluster mass distribution is the most likely source of the enhanced fraction of barred spirals in the cluster center.

  13. New experimental techniques with the split Hopkinson pressure bar

    SciTech Connect (OSTI)

    Frantz, C.E.; Follansbee, P.S.; Wright, W.J.

    1984-01-01T23:59:59.000Z

    The split Hopkinson pressure bar or Kolsky bar has provided for many years a technique for performing compression tests at strain rates approaching 10/sup 4/ s/sup -1/. At these strain rates, the small dimensions possible in a compression test specimen give an advantage over a dynamic tensile test by allowing the stress within the specimen to equilibrate within the shortest possible time. The maximum strain rates possible with this technique are limited by stress wave propagation in the elastic pressure bars as well as in the deforming specimen. This subject is reviewed in this paper, and it is emphasized that a slowly rising excitation is preferred to one that rises steeply. Experimental techniques for pulse shaping and a numerical procedure for correcting the raw data for wave dispersion in the pressure bars are presented. For tests at elevated temperature a bar mover apparatus has been developed which effectively brings the cold pressure bars into contact with the specimen, which is heated with a specially designed furnace, shortly before the pressure wave arrives. This procedure has been used successfully in tests at temperatures as high as 1000/sup 0/C.

  14. 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.

  15. Measurement of leptonic asymmetries and top-quark polarization in tt-bar production

    E-Print Network [OSTI]

    Baringer, Philip S.; Bean, Alice; Chen, G.; Clutter, Justace Randall; Sekaric, Jadranka; Wilson, Graham Wallace; Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Askew, A.; Atkins, S.

    2013-01-24T23:59:59.000Z

    We present measurements of lepton (?) angular distributions in top-quark (t) pair production and tt-bar?W+bW?b-bar??+?b???-b-ar b-bar decays produced in pp-bar collisions at a center-of-mass energy of s?=1.96??TeV, where ...

  16. Standard specification for niobium-titanium alloy billets, bar, and rod for superconducting applications

    E-Print Network [OSTI]

    American Society for Testing and Materials. Philadelphia

    2011-01-01T23:59:59.000Z

    Standard specification for niobium-titanium alloy billets, bar, and rod for superconducting applications

  17. 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.

  18. 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.

  19. 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 $T_2 > 2\\,ms$.

  20. 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.

  1. Model formalisms, continued; CA, ODE, Boolean networks

    E-Print Network [OSTI]

    Utrecht, Universiteit

    ­ Mesoscale patterns ­ Zoo QUESTIONS? TODAY · CA as modeling tool: common generalisations · alternative

  2. The influence of surface interactions on the reversibility of ferri/ferrocyanide at boron-doped diamond thin-film electrodes

    SciTech Connect (OSTI)

    Granger, M.C.; Swain, G.M.

    1999-12-01T23:59:59.000Z

    The electrochemistry of four redox analytes [Fe(CN){sub 6}{sup {minus}3/{minus}4}, Ru(NH{sub 3}){sub 6}{sup +2/+3}, IrCl{sub 6}{sup {minus}2/{minus}3}, and methyl viologen, MV{sup +2/+/0}] was investigated at polycrystalline, boron-doped diamond thin-film electrodes before and after anodic polarization and hydrogen plasma treatment. The as-deposited diamond surface is predominantly hydrogen treatment, and quasi-reversible cyclic voltammograms ({Delta}E{sub p} of 60--80 mV) were observed for all of these couples at 0.1 V/s. After anodic polarization in H{sub 2}SO{sub 4}, the surface atomic O/C ratio, as determined by X-ray photoelectron spectroscopy, increased from 0.02 to ca. 0.20. Concomitant with the increase in surface oxygen, the {Delta}E{sub p} for Fe(CN){sub 6}{sup {minus}3/{minus}4} increased to over 200 mV, while the {Delta}E{sub p} values for the other redox systems remained relatively unchanged. After acid washing and rehydrogenating the surface in hydrogen plasma (i.e., atomic hydrogen), the {Delta}E{sub p} for Fe(CN){sub 6}{sup {minus}3/{minus}4} returned to ca. 80 mV, while the {Delta}E{sub p} values for the other three redox analytes remained close to the original values. The results demonstrate the electron transfer for ferri/ferrocyanide is very sensitive to the presence of surface carbon-oxygen functionalities and that the electron transfer involves a site associated with the hydrogen-terminated surface. The results also unequivocally rule out the influence of adventitious nondiamond phases as the sole sites for the electron transfer.

  3. The Formation of Nuclear Rings in Barred Spiral Galaxies

    E-Print Network [OSTI]

    Michael W. Regan; Peter J. Teuben

    2002-10-10T23:59:59.000Z

    Although nuclear rings of gas and star formation are common in barred spiral galaxies, current theories of why and how they form do not provide the level of detail needed to quantify the effect that these rings can have on the fueling of active galactic nuclei and on the evolution of their host galaxy. In this paper we use detailed modeling to show that existence of nuclear rings is directly related to the existence of the orbit family whose major axis is perpendicular to the major axis of the bar (x_2). We explore a large range of barred galaxy potentials and for each potential we use a two-dimensional hydrodynamic simulation to determine whether and at what radius a nuclear ring forms. We compare the results of the hydrodynamic simulations to numerical integrations of periodic orbits in a barred potential and show that the rings only form when a minimum amount of x_2 orbits exists. Because the rings migrate inwards with time as they accumulate gas, the radius at which a nuclear ring is seen does not give direct information on the shape of the rotation curve. We also show that the common assumption that nuclear rings are related to an inner Lindblad resonance is incorrect. In fact, we show that there is no RESONANCE at the inner Lindblad resonance in barred galaxies. We also compare the predictions of this theory to HST observations and show that it correctly predicts the observed gas and star formation morphology of nuclear rings.

  4. 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 ...

  5. 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...

  6. 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...

  7. 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...

  8. 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...

  9. 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...

  10. 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

  11. 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.

  12. 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.

  13. 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.

  14. 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.

  15. 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...

  16. 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

  17. Some characteristics of waves broken by a longshore bar

    E-Print Network [OSTI]

    McNair, Ernest Clark

    1970-01-01T23:59:59.000Z

    versi. Ly. iv!onochromati c & gravity matc! waves a!ere ge!crated toward this bar formation. The waves broke as they passed over the bar and then re-formed as they entered the deeper water in the lee of' the bar. Recordings of the vrater-surface time... water level; a a:id b are i&oui". '~cr cocf'- "n n ficients; ii Is an int gcr co"tqicicn4; aii&I o is the angular fre- quency. IIg ihc application oi. ' Lhc Farscval 4I&eor" irr f' or. pcrioriic f'unciici. ons (ri) & T && Pg ~(*)? dt E. -r I T 0 7...

  18. Studies of Charmonium-Like States at BaBar

    SciTech Connect (OSTI)

    Mokhtar, Arafat Gabareen; /SLAC

    2012-04-09T23:59:59.000Z

    Several charmonium-like states above D{bar D} threshold have been discovered at the Belle and BABAR B-factories. Some of these states are produced via Initial State Radiation (e.g. Y(4260) and Y(4350)), and some are observed in B-meson decays (e.g. X(3872), and Y(3940)). The Belle observations of the enhancements in the {Psi}(2S){pi}{sup -} and {chi}{sub cl}{pi}{sup -}, i.e. the Z(4430){sup -}, Z{sub 1}(4050){sup -}, and Z{sub 2}(4250){sup -}, have generated a great deal of interest, because such states must have minimum quark content (c{bar c}d{bar u}), i.e. these are four-quark states. The BABAR Collaboration does not confirm the existence of the Z(4430){sup -}.

  19. Status and perspectives for $\\bar PANDA$ at FAIR

    E-Print Network [OSTI]

    Elisabetta Prencipe

    2014-11-05T23:59:59.000Z

    The Facility for Antiproton and Ion Research (FAIR) is an international accelerator facility which will use antiprotons and ions to perform research in the fields of nuclear, hadron and particle physics, atomic and anti-matter physics, high density plasma physics and applications in condensed matter physics, biology and the bio-medical sciences. It is located at Darmstadt (Germany) and it is under construction. Among all projects in development at FAIR in this moment, this report focuses on the $\\bar PANDA$ experiment (antiProton ANnihilation at DArmstadt). Some topics from the Charm and Charmonium physics program of the $\\bar PANDA$ experiment will be highlighted, where $\\bar PANDA$ is expected to provide first measurements and original contributions, such as the measurement of the width of very narrow states and the measurements of high spin particles, nowaday undetected. The technique to measure the width of these very narrow states will be presented, and a general overview of the machine is provided.

  20. 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).

  1. Measurement of the $t\\bar{t}$ production cross section using dilepton events in $p\\bar{p}$ collisions

    SciTech Connect (OSTI)

    Abazov, Victor Mukhamedovich; /Dubna, JINR; Abbott, Braden Keim; /Oklahoma U.; Acharya, Bannanje Sripath; /Tata Inst.; Adams, Mark Raymond; /Illinois U., Chicago; Adams, Todd; /Florida State U.; Alexeev, Guennadi D.; /Dubna, JINR; Alkhazov, Georgiy D.; /St. Petersburg, INP; Alton, Andrew K.; /Michigan U. /Augustana Coll., Sioux Falls; Alverson, George O.; /Northeastern U.; Alves, Gilvan Augusto; /Rio de Janeiro, CBPF; Ancu, Lucian Stefan; /Nijmegen U. /Fermilab

    2011-05-01T23:59:59.000Z

    We present a measurement of the t{bar t} production cross section {sigma}{sub t{bar t}} in p{bar p} collisions at {radical}s = 1.96 TeV using 5.4 fb{sup -1} of integrated luminosity collected with the D0 detector. We consider final states with at least two jets and two leptons (ee, e{mu}, {mu}{mu}), and events with one jet for the the e{mu} final state as well. The measured cross section is {sigma}{sub t{bar t}} = 7.36{sub -0.79}{sup +0.90} (stat + syst) pb. This result combined with the cross section measurement in the lepton + jets final state yields {sigma}{sub t{bar t}} = 7.56{sub -0.56}{sup +0.63}(stat + syst) pb, which agrees with the standard model expectation. The relative precision of 8% of this measurement is comparable to the latest theoretical calculations.

  2. The Fueling of Nuclear Activity: II. The Bar Properties of Seyfert and Normal Galaxies

    E-Print Network [OSTI]

    John S. Mulchaey; Michael W. Regan

    1997-04-11T23:59:59.000Z

    We use a recent near-infrared imaging survey of samples of Seyfert and normal galaxies to study the role of bars in the fueling of nuclear activity. The active galaxy sample includes Seyfert galaxies in the Revised Shapely-Ames (RSA) and Sandage & Tammann's (1987) extension to this catalog. The normal galaxies were selected to match the Seyfert sample in Hubble type, redshift, inclination and blue luminosity. All the galaxies in both samples classified as barred in the RSA catalog are also barred in the near-infrared. In addition, ~55% of the galaxies classified as non-barred in the RSA show evidence for bars at 2.1 microns. Overall, ~70% of the galaxies observed show evidence for bar structures. The incidence of bars in the Seyfert and normal galaxies is similar, suggesting Seyfert nuclei do not occur preferentially in barred systems. Furthermore, a slightly higher percentage of normal galaxies have multiple-bar structures.

  3. STAR FORMATION IN NUCLEAR RINGS OF BARRED GALAXIES

    SciTech Connect (OSTI)

    Seo, Woo-Young; Kim, Woong-Tae, E-mail: seowy@astro.snu.ac.kr, E-mail: wkim@astro.snu.ac.kr [Center for the Exploration of the Origin of the Universe (CEOU), Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of)

    2013-06-01T23:59:59.000Z

    Nuclear rings in barred galaxies are sites of active star formation. We use hydrodynamic simulations to study the temporal and spatial behavior of star formation occurring in nuclear rings of barred galaxies where radial gas inflows are triggered solely by a bar potential. The star formation recipes include a density threshold, an efficiency, conversion of gas to star particles, and delayed momentum feedback via supernova explosions. We find that the star formation rate (SFR) in a nuclear ring is roughly equal to the mass inflow rate to the ring, while it has a weak dependence on the total gas mass in the ring. The SFR typically exhibits a strong primary burst followed by weak secondary bursts before declining to very small values. The primary burst is associated with the rapid gas infall to the ring due to the bar growth, while the secondary bursts are caused by re-infall of the ejected gas from the primary burst. While star formation in observed rings persists episodically over a few Gyr, the duration of active star formation in our models lasts for only about half of the bar growth time, suggesting that the bar potential alone is unlikely to be responsible for gas supply to the rings. When the SFR is low, most star formation occurs at the contact points between the ring and the dust lanes, leading to an azimuthal age gradient of young star clusters. When the SFR is large, on the other hand, star formation is randomly distributed over the whole circumference of the ring, resulting in no apparent azimuthal age gradient. Since the ring shrinks in size with time, star clusters also exhibit a radial age gradient, with younger clusters found closer to the ring. The cluster mass function is well described by a power law, with a slope depending on the SFR. Giant gas clouds in the rings have supersonic internal velocity dispersions and are gravitationally bound.

  4. Structure and kinematics of candidate double-barred galaxies

    E-Print Network [OSTI]

    A. V. Moiseev; J. R. Valdes; V. H. Chavushyan

    2004-02-02T23:59:59.000Z

    Results of optical and NIR spectral and photometric observations of a sample of candidate double-barred galaxies are presented. Velocity fields and velocity dispersion maps of stars and ionized gas, continuum and emission-line images were constructed from integral-field spectroscopy observations carried out at the 6m telescope (BTA) of SAO RAS, with the MPFS spectrograph and the scanning Fabry-Perot Interferometer. NGC2681 was also observed with the long-slit spectrograph of the BTA. Optical and NIR images were obtained at the BTA and at the 2.1m telescope (OAN, M\\'exico). High-resolution images were retrieved from the HST data archive. Morphological and kinematic features of all 13 sample objects are described in detail. Attention is focused on the interpretation of observed non-circular motions of gas and stars in circumnuclear (one kiloparsec- scale) regions. We have shown first of all that these motions are caused by the gravitational potential of a large-scale bar. NGC3368 and NGC3786 have nuclear bars only, their isophotal twist at larger radii being connected with the bright spiral arms. Three cases of inner polar disks in our sample (NGC2681, NGC3368 and NGC5850) are considered. We found ionized-gas counter-rotation in the central kiloparsec of the lenticular galaxy NGC3945. Seven galaxies (NGC470, NGC2273, NGC2681, NGC3945, NGC5566, NGC5905, and NGC6951) have inner mini-disks nested in large-scale bars. Minispiral structures occur often in these nuclear disks. It is interesting that the majority of the observed, morphological and kinematical, features in the sample galaxies can be explained without the secondary bar hypothesis. Thus we suggest that a dynamically independent secondary bar is a rarer phenomenon than follows from isophotal analysis of the images only.

  5. Distributed Online Conditions Database of the BaBar Experiment

    SciTech Connect (OSTI)

    Khan, A.; /Brunel U.; Gaponenko, I.A.; Brown, D.N.; /LBL, Berkeley

    2011-11-21T23:59:59.000Z

    This paper presents CDB - The distributed Conditions Database of the BaBar Experiment. CDB is the second major iteration of the database deployed in BaBar for production use as of October 2002. It replaced the original version of the database used through the first three years of the data taking. The new design and its implementation aims to improve the performance and scalability of the original database and addresses the emerging challenges of the distributed data production and analysis system of the Experiment.

  6. carleton.ca Earth Sciences

    E-Print Network [OSTI]

    Dawson, Jeff W.

    carleton.ca Earth Sciences #12;Earth is our home. It is a dynamic planet, integrating and recording spectrometers or electron microprobes--earth scientists investigate Earth's evolution to help understand future today and for the future is enhanced by the expertise of economic geologists. Knowledge of the Earth

  7. carleton.ca Food Science

    E-Print Network [OSTI]

    Dawson, Jeff W.

    of foods, genetically modified foods, food contamination and preservation. The Carleton advantage Food and biochemistry, genetics and organic chemistry. A Principles of Nutrition (FOOD 2001) course allows you to gaincarleton.ca Food Science and Nutrition #12;The production and distribution of food is one

  8. An Automated Approach for $q\\bar{q}\\to b\\bar{b}b\\bar{b}$ at Next-to-Leading Order QCD

    E-Print Network [OSTI]

    Thomas Reiter

    2009-04-02T23:59:59.000Z

    The search for the Higgs boson and for physics beyond the Standard Model are the major motivations behind the LHC experiment. In many scenarios the success of the experiment depends on the knowledge of signal and background event rates at least at one-loop precision. We present the approach of the \\texttt{GOLEM} collaboration to build a highly automated framework for the calculation of matrix elements at the one-loop level, which is based on the evaluation of Feynman diagrams. Part of this effort is an open-source library for the numerical evaluation of tensor integrals. As an application, some results for the process $pp\\to b\\bar{b}b\\bar{b}$ calculated with this method are presented.

  9. 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...

  10. 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.

  11. Bar-halo Friction in Galaxies I: Scaling Laws

    E-Print Network [OSTI]

    J. A. Sellwood

    2005-09-28T23:59:59.000Z

    It has been known for some time that rotating bars in galaxies slow due to dynamical friction against the halo. However, recent attempts to use this process to place constraints on the dark matter density in galaxies and possibly also to drive dark matter out of the center have been challenged. This paper uses simplified numerical experiments to clarify several aspects of the friction mechanism. I explicitly demonstrate the Chandrasekhar scaling of the friction force with bar mass, halo density, and halo velocity dispersion. I present direct evidence that exchanges between the bar and halo orbits at major resonances are responsible for friction and study both individual orbits and the net changes at these resonances. I also show that friction alters the phase space density of particles in the vicinity of a major resonance, which is the reason the magnitude of the friction force depends on the prior evolution. I demonstrate that bar slow down can be captured correctly in simulations having modest spatial resolution and practicable numbers of particles. Subsequent papers in this series delineate the dark matter density that can be tolerated in halos of different density profiles.

  12. Measurements of Form Factors with the BaBar Experiment

    SciTech Connect (OSTI)

    Li, Selina Z.; /SLAC

    2011-08-25T23:59:59.000Z

    Selected recent results on measurements of form factors by the BaBar Collaboration are reviewed, including e{sup +}e{sup -} {yields} {eta}{prime}{gamma}, leptonic and semileptonic charm decays from data collected at or near the {Upsilon}(4S) resonance.

  13. BaBar Note 295 May 16th, 1996

    E-Print Network [OSTI]

    and cooling system. Three types of hybrid will be used in BaBar SVT, di ering in the number of chips from 10 generated on the hybrid. We have realized that lateral walls of the channel help the heat exchange between of the cooling system in keeping the front-end chips into their optimal working condition. Thermo

  14. TECHNICAL ADVANCE BAR expressolog identification: expression profile similarity

    E-Print Network [OSTI]

    Toronto, University of

    TECHNICAL ADVANCE BAR expressolog identification: expression profile similarity ranking with the highest sequence similarity do not necessarily exhibit the highest expression pattern similarity. Other-annotation or more specific annotation. Ultimately, it is envisaged that this pipeline will aid in improvement

  15. Diamond Beach, New Jersey: 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 JumpConceptual Model,DOE Facility DatabaseMichigan:Dewey-Humboldt, Arizona:Research CompanyBar,Beach,

  16. Ca

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

    30, 1998 Mr. Eric J. Fygi U.S. Department of Energy Office of General Counsel GC-52 1000 Independence Ave. S.W. Washington, D.C. 20585 (PAA.notice@hq.doe.gov) RE: Comments...

  17. Ca

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

    ED C. Walker, Trinity Engineering ED ED denotes electronic distribution CBFO:ORC :GTB:MDA: 1 0-0972 :UFC 5486 .00 David C. Moody, Manager M. F. Sharif, General Manager Carlsbad...

  18. Ca

    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 for4,645U.S. DOE Office511041clothAdvanced Materials Advanced. C o w l i t z C o . C l a r8.0 -CURRICULUM9831 WallEnclosureP O.

  19. Ca

    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 for4,645U.S. DOE Office511041clothAdvanced Materials Advanced. C o w l i t z C o . C l a r8.0 -CURRICULUM9831 WallEnclosureP

  20. Ca

    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 for4,645U.S. DOE Office511041clothAdvanced Materials Advanced. C o w l i t z C o . C l a r8.0 -CURRICULUM9831 WallEnclosurePJames

  1. Ca

    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 BatteriesCAESMission Welcomefor GasforCSMB6 1the

  2. 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

  3. Investigating the use of fiber-reinforced polymer bars in concrete

    E-Print Network [OSTI]

    Najm, Mounir (Mounir Simon)

    2012-01-01T23:59:59.000Z

    Fiber Reinforced Polymer bars were introduced to the market over two decades ago. However, their use is still somewhat limited. FRP bars are very corrosion resistant and with much of the US infrastructure degrading, the ...

  4. Physics of Sustainable Energy Berkeley CA

    E-Print Network [OSTI]

    Kammen, Daniel M.

    California Largest Solar Thermal Electric Plant SEGS Mojave Desert (CA) 354 MW Ivanpah Mojave Desert (CA) 400 of Sustainable Energy Berkeley CA March 5-6, 2011 Concentrating Solar Power ­ Direct Sun State and Kearney (2007) PV Solar Resource ­ Indirect Sun Roof area ~ 6B m2 ~ 600 GW Urban footprint ~ 3% of land

  5. Spreader-Bar Radiation Detection System Enhancements: A Modeling and Simulation Study

    SciTech Connect (OSTI)

    Ely, James H.; Ashbaker, Eric D.; Batdorf, Michael T.; Baciak, James E.; Hensley, Walter K.; Jarman, Kenneth D.; Robinson, Sean M.; Sandness, Gerald A.; Schweppe, John E.

    2012-11-13T23:59:59.000Z

    This report provides the modeling and simulation results of the investigation of enhanced spreader bar radiation detection systems.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. 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

  15. 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}.

  16. 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.

  17. 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.

  18. A Reconfigurable Motor for Experimental Emulation of Stator Winding Inter-Turn and Broken Bar Faults

    E-Print Network [OSTI]

    Povinelli, Richard J.

    A Reconfigurable Motor for Experimental Emulation of Stator Winding Inter-Turn and Broken Bar emulation of stator winding inter-turn and broken rotor bar faults, are presented in this paper such as stator windings or rotor bars when acquiring data from a knWi dinL lar Bearit faulty machine for fault

  19. DOE - Office of Legacy Management -- Berkeley CA Site - CA 03

    Office of Legacy Management (LM)

    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 group currentBradleyTableSelling Corp -KWatertowni5W 95.5x-L*AlaskaBerkeley CA

  20. 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

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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.

  9. 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.

  10. CA-96062042 | 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:Power LP Biomass Facility JumpBurleighGeothermal LeasesCA-96062042 Jump

  11. 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.

  12. 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.

  13. 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

  14. 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.

  15. 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.

  16. Measurement of the ratio of differential cross sections ?(pp-bar?Z+b?jet)/?(pp-bar?Z+jet) in pp-bar collisions at s?=1.96??TeV

    E-Print Network [OSTI]

    Baringer, Philip S.; Bean, Alice; Chen, G.; Clutter, Justace Randall; Sekaric, Jadranka; Wilson, Graham Wallace; Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Askew, A.; Atkins, S.; Augsten, K.

    2013-05-28T23:59:59.000Z

    We measure the ratio of cross sections, ?(pp-bar?Z+b?jet)/?(pp-bar?Z+jet), for associated production of a Z boson with at least one jet. The ratio is also measured as a function of the Z boson transverse momentum, jet ...

  17. Electroweak Penguin and Leptonic Decays at BaBar

    SciTech Connect (OSTI)

    Bucci, F.; /Pisa U. /INFN, Pisa

    2005-08-26T23:59:59.000Z

    Recent BABAR results on electroweak penguin and leptonic decays are reviewed. In particular, the measurements of B {yields} K{sup (*)}l{sup +}l{sup -} and the preliminary results on B {yields} X{sub s}l{sup +}l{sup -} are presented. Also summarized are the preliminary limits on B{sup +} {yields} l{sup +}{nu} (l = e,{mu}) and B{sup +} {yields} K{sup +}{nu}{bar {nu}}.

  18. The large scale dust lanes of the Galactic bar

    E-Print Network [OSTI]

    D. J. Marshall; R. Fux; A. C. Robin; C. Reyle

    2007-11-15T23:59:59.000Z

    (abridged) By comparing the distribution of dust and gas in the central regions of the Galaxy, we aim to obtain new insights into the properties of the offset dust lanes leading the bar's major axis in the Milky Way. On the one hand, the molecular emission of the dust lanes is extracted from the observed CO l-b-V distribution according to the interpretation of a dynamical model. On the other hand, a three dimensional extinction map of the Galactic central region constructed from near-infrared observations is used as a tracer of the dust itself and clearly reveals dust lanes in its face-on projection. Comparison of the position of both independent detections of the dust lanes is performed in the (l, b) plane. These two completely independent methods are used to provide a coherent picture of the dust lanes in the Milky Way bar. In both the gas and dust distributions, the dust lanes are found to be out of the Galactic plane, appearing at negative latitudes for l > 0 deg and at positive latitudes for l reformation downstream. Due to the decrease in velocity caused by the shock, this occurs at lower z. The second assumes that the gas and dust remain on a common tilted plane, but that the molecular gas decouples from the Milky Way's magnetic field, itself strong enough to resist the shear of the bar's shock. The diffuse gas and dust remain coupled to the field and are carried further downstream. This second scenario has recently been suggested in order to explain observations of the barred galaxy NGC 1097.

  19. Hydrodynamical Simulations of Nuclear Rings in Barred Galaxies

    E-Print Network [OSTI]

    Li, Zhi; Kim, Woong-Tae

    2015-01-01T23:59:59.000Z

    Dust lanes, nuclear rings, and nuclear spirals are typical gas structures in the inner region of barred galaxies Their shapes and properties are linked to the physical parameters of the host galaxy. We use high-resolution hydrodynamical simulations to study 2D gas flows in simple barred galaxy models. The nuclear rings formed in our simulations can be divided into two groups: one group is nearly round and the other is highly elongated. We find that roundish rings may not form when the bar pattern speed is too high or the bulge central density is too low. We also study the periodic orbits in our galaxy models, and find that the concept of inner Lindblad resonance (ILR) may be generalized by the extent of $x_2$ orbits. All roundish nuclear rings in our simulations settle in the range of $x_2$ orbits (or ILRs). However, knowing the resonances is insufficient to pin down the exact location of these nuclear rings. We suggest that the backbone of round nuclear rings is the $x_2$ orbital family, i.e. round nuclear r...

  20. Structure and kinematics of candidate double-barred galaxies

    E-Print Network [OSTI]

    Moiseev, A V; Chavushyan, V H

    2003-01-01T23:59:59.000Z

    Results of optical and NIR spectral and photometric observations of a sample of candidate double-barred galaxies are presented. Velocity fields and velocity dispersion maps of stars and ionized gas, continuum and emission-line images were constructed from integral-field spectroscopy observations carried out at the 6m telescope (BTA) of SAO RAS, with the MPFS spectrograph and the scanning Fabry-Perot Interferometer. NGC2681 was also observed with long-slit spectrograph of the BTA. Optical and NIR images were obtained at the BTA and at the 2.1m telescope (OAN, M\\'exico). High-resolution images were retrieved from the HST data archive. Morphological and kinematic features of all 13 sample objects are described in detail. Attention is focused on the interpretation of observed non-circular motions of gas and stars in circumnuclear (one kiloparsec- scale) regions. We have shown first of all that these motions are caused by a gravitational potential of large-scale bar. NGC3368 and NGC3786 have nuclear bars only, the...

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. Energy dependence of $\\bar{K}N$ interaction in nuclear medium

    E-Print Network [OSTI]

    A. Cieply

    2011-12-05T23:59:59.000Z

    When the $\\bar{K}N$ system is submerged in nuclear medium the $\\bar{K}N$ scattering amplitude and the final state branching ratios exhibit a strong energy dependence when going to energies below the $\\bar{K}N$ threshold. A sharp increase of $\\bar{K}N$ attraction below the $\\bar{K}N$ threshold provides a link between shallow $\\bar{K}$-nuclear potentials based on the chiral $\\bar{K}N$ amplitude evaluated at threshold and the deep phenomenological optical potentials obtained in fits to kaonic atoms data. We show the energy dependence of the in-medium $K^{-}p$ amplitude and demonstrate the impact of energy dependent branching ratios on the $\\Lambda$-hypernuclear production rates. \\keywords{kaon-nucleon amplitude \\and nuclear medium \\and hypernuclei

  8. Li/Ca, B/Ca, and Mg/Ca Composition of Cultured Sea Urchin Spines and Paleo-Echinoderms Measured Using a Secondary Ion Mass Spectrometer

    E-Print Network [OSTI]

    Nguyen, Trung Timothy Do

    2013-01-01T23:59:59.000Z

    Li/Ca was normalized to HTP-CC standard, B/Ca was normalizednormalized to calcites (CAL-HTP and UCI) for Li and Mg and aintensity ratios of Li/Ca (CAL-HTP), B/Ca (M93), and Mg/Ca (

  9. www.yorku.ca/research Ergonomics Laboratory

    E-Print Network [OSTI]

    www.yorku.ca/research Ergonomics Laboratory -- Biomechanics At York School of Kinesiology Salas The Ergonomics Laboratory creates healthier workplaces by reducing individuals' risk of developing

  10. An Estimate of the Partial Width for X(3872) into p p-bar

    E-Print Network [OSTI]

    Eric Braaten

    2008-02-17T23:59:59.000Z

    We present an estimate of the partial width of X(3872) into p p-bar under the assumption that it is a weakly-bound hadronic molecule whose constituents are a superposition of the charm mesons D^{*0} D-bar^0 and D^{0} D-bar^{*0}. The p p-bar partial width of X is therefore related to the cross section for p p-bar to D^{*0} D-bar^0 near the threshold. That cross section at an energy well above the threshold is estimated by scaling the measured cross section for p p-bar to K^{*-} K^+. It is extrapolated to the D^{*0} D-bar^0 threshold by taking into account the threshold resonance in the 1^{++} channel. The resulting prediction for the p p-bar partial width of X(3872) is proportional to the square root of its binding energy. For the current central value of the binding energy, the estimated partial width into p p-bar is comparable to that of the P-wave charmonium state chi_{c1}.

  11. Can bars be destroyed by a central mass concentration? I. Simulations

    E-Print Network [OSTI]

    E. Athanassoula; J. C. Lambert; W. Dehnen

    2005-07-24T23:59:59.000Z

    We study the effect of a central mass concentration (CMC) on the secular evolution of a barred disc galaxy. Unlike previous studies, we use fully self-consistent 3D $N$-body simulations with live haloes, which are known to be important for bar evolution. The CMC is introduced gradually, to avoid transients. In all cases where the mass of the CMC is of the order of, or more than, a few per cent of the mass of the disc, the strength of the bar decreases noticeably. The amount of this decrease depends strongly on the bar type. For the same CMC, bars with exponential surface-density profile, which formed in a disk-dominated galaxy (MD-type bars), can be totally destroyed, while strong bars with a flat surface-density profile, whose evolution is largely due to the halo (MH-type bars), witness only a decrease of their strength. This decrease occurs simultaneously from both the innermost and outermost parts of the bar. The CMC has a stronger effect on the Fourier components of higher azimuthal wave number $m$, leading to fatter and/or less rectangular bars. Furthermore, the CMC changes the side-on outline from peanut-shaped to boxy or, for massive CMCs, to elliptical. Similarly, side-on initially boxy outlines can be destroyed. The CMC also influences the velocity dispersion profiles. Most of the decrease of the bar strength occurs while the mass of the CMC increases and it is accompanied by an increase of the pattern speed. In all our simulations, the mass of the CMC necessary in order to destroy the bar is at least several per cent of the mass of the disc. This argues that observed super-massive black holes are not likely to destroy pre-existing bars.

  12. Diamond Willow Wind (07) 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 directedAnnualPropertyd8c-a9ae-f8521cbb8489 No revision hasda62829c05bGabbs TypeWinds Wind Farm

  13. Diamond Willow Wind (08) 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 directedAnnualPropertyd8c-a9ae-f8521cbb8489 No revision hasda62829c05bGabbs TypeWinds Wind Farm8) Wind Farm

  14. 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.

  15. 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

  16. 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

  17. 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

  18. 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.

  19. 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

  20. 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

  1. 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.

  2. 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.

  3. 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

  4. 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.

  5. Diamond Amplified Photocathode Ilan Ben-Zvi, Andrew Burrill, Xiangyun Chang, Peter D.

    E-Print Network [OSTI]

    the diamond sample This heat load can be handled by LN cooling #12;Experimental Program I · Measure SEY and temporal broadening · Determine High Current Performance (Heat load, electron temperature) · Establish temperature is calculated to be ~ 0.35eV. Electron temperature for transport mode #12;Transit time: Drift

  6. Standards Panel: 1. Stephen Diamond, General Manager, Industry Standards Office and Global Standards Officer, EMC

    E-Print Network [OSTI]

    Standards Officer, EMC Corporation, Office of the CTO Steve Diamond has 30 years of management, marketing was President of the IEEE Computer Society. Steve is General Manager of the Industry Standards Office at EMC Corporation, and Global Standards Officer in the Office of the CTO. Before EMC, he was responsible for cloud

  7. N-type droping of nanocrystalline diamond films with nitrogen and electrodes made therefrom

    DOE Patents [OSTI]

    Gruen, Dieter M. (Downers Grove, IL); Krauss, Alan R. (late of Naperville, IL); Auciello, Orlando H. (Bolingbrook, IL); Carlisle, John A. (Plainfield, IL)

    2004-09-21T23:59:59.000Z

    An electrically conducting n-type ultrananocrystalline diamond (UNCD) having no less than 10.sup.19 atoms/cm.sup.3 of nitrogen is disclosed. A method of making the n-doped UNCD. A method for predictably controlling the conductivity is also disclosed.

  8. Vol 435|30 June 2005 Jianguo Liu and Jared Diamond

    E-Print Network [OSTI]

    Huang, Youqin

    , social conflicts and health costs within China. China's environmental prob- lems are also spilling overVol 435|30 June 2005 1179 Jianguo Liu and Jared Diamond China is the world's most popu- lous into other countries, while other coun- tries affect China's environment through globalization, pollution

  9. Ultrananocrystalline diamond thin films for MEMS and moving mechanical assembly devices.

    SciTech Connect (OSTI)

    Krauss, A. R.; Gruen, D. M.; Jayatissa, A.; Sumant, A.; Tucek, J.; Auciello, O.; Mancini, D.; Moldovan, N.; Erdemir, A.; Ersoy, D.; Gardos, M. N.; Busmann, H. G.; Meyer, E. M.; Ding, M. Q.; Univ. of Illinois at Chicago; Raytheon Electronic Systems Comp.; Fraunhofer Inst. for Applied Materials Science; Univ. of Bremen; Beijing Inst. of Electronics

    2001-11-01T23:59:59.000Z

    MEMS devices are currently fabricated primarily in silicon because of the available surface machining technology. A major problem with the Si-based MEMS technology is that Si has poor mechanical and tribological properties [J.J. Sniegowski, in: B. Bushan (Ed.), Tribology Issues and Opportunities in MEMS, Kluwer Academic Publisher, The Netherlands, 1998, p. 325; A.P. Lee, A.P. Pisano, M.G. Lim, Mater. Res. Soc. Symp. Proc. 276 (1992) 67.], and practical MEMS devices are currently limited primarily to applications involving only bending and flexural motion, such as cantilever accelerometers and vibration sensors. However, because of the poor flexural strength and fracture toughness of Si, and the tendency of Si to adhere to hydrophilic surfaces, even these simple devices have limited dynamic range. Future MEMS applications that involve significant rolling or sliding contact will require the use of new materials with significantly improved mechanical and tribological properties, and the ability to perform well in harsh environments, Diamond is a superhard material of high mechanical strength, exceptional chemical inertness, and outstanding thermal stability. The brittle fracture strength is 23 times that of Si, and the projected wear life of diamond MEMS moving mechanical assemblies (MEMS MMAs) is 10 000 times greater than that of Si MMAs. However, as the hardest known material, diamond is notoriously difficult to fabricate. Conventional CVD thin film deposition methods offer an approach to the fabrication of ultra-small diamond structures, but the films have large grain size, high internal stress, poor intergranular adhesion, and very rough surfaces, and are consequently ill-suited for MEMS MMA applications. Diamond-like films are also being investigated for application to MEMS devices. However, they involve mainly physical vapor deposition methods that are not suitable for good conformal deposition on high aspect ratio features, and generally they do not exhibit the outstanding mechanical properties of diamond. We demonstrate here the application of a novel microwave plasma technique using a unique C{sub 60}/Ar or CH{sub 4}/Ar chemistry that produces phase-pure ultrananocrystalline diamond (UNCD) coatings with morphological and mechanical properties that are ideally suited for MEMS applications in general, and MMA use in particular. We have developed lithographic techniques for the fabrication of UNCD-MEMS components, including cantilevers and multi-level devices, acting as precursors to microbearings and gears, making UNCD a promising material for the development of high performance MEMS devices.

  10. Selected Topics on Hadronic B Decays From BaBar

    SciTech Connect (OSTI)

    Suzuki, K.; /SLAC

    2011-11-23T23:59:59.000Z

    Recent measurements of branching fractions and decay-rate asymmetries in charmless hadronic B decays at the BaBar experiment are presented. The selected topics include Dalitz plot analyses of B {yields} K{sup +} {pi}{sup -}{pi} and signal searches in B {yields} PP and PV, where isoscalar mesons are involved, and in B {yields} b{sub 1}P, P and V denote a pseudoscalar and vector meson, respectively. Several measurements in charmless hadronic B decays have indicated possible deviations from the theoretical predictions within the Standard Model. The measurements presented would contribute to searching for and resolving such puzzles.

  11. Golden Bars of Consensus and the Truth Quark

    E-Print Network [OSTI]

    Frank D. Tony Smith; jr

    2002-05-14T23:59:59.000Z

    Scientists are imprisoned by Golden Bars of Consensus, says Burton Richter (hep-ex/0001012). A case in point is the mass of the Truth Quark. The consensus analysis of the experimental data indicates that the mass of the Truth Quark is about 170 GeV. On the other hand, an alternative analysis of the same data indicates that the mass of the Truth Quark is about 130 GeV. If the design of future experiments, including trigger, event selection, data analysis procedures, error analysis, etc., takes into account only the consensus value, and if the consensus value happens to be incorrect, then results of future experiments might be compromised.

  12. Rare Decays And Exotic States With BaBar

    SciTech Connect (OSTI)

    Robertson, S.H.; /McGill U.

    2006-08-28T23:59:59.000Z

    Results from the BABAR experiment are presented for searches for several rare FCNC B and D meson decays, including the modes B{sup 0} {yields} {ell}{sup +}{ell}{sup -} and D{sup 0} {yields} {ell}{sup +}{ell}{sup -}, B {yields} ({rho},{omega}){gamma} and B{sup +} {yields} (K,{pi}){sup +}{nu}{bar {nu}}. Limits on lepton flavor violation in neutrino-less {tau} decays are also discussed. Finally, results of BABAR searches for the strange pentaquark states {Theta}{sup +}(1540), {Xi}{sup --}(1860) and {Xi}{sup 0}(1860) are summarized.

  13. Tribological performance of diamond and diamondlike carbon films at elevated temperatures

    SciTech Connect (OSTI)

    Erdemir, A.; Fenske, G.R.

    1995-09-01T23:59:59.000Z

    In this study, we investigated the tribological performance of diamond and diamondlike carbon (DLC) films as a function of ambient temperature. Both films were deposited on silicon carbide (SiC) by microwave plasma chemical vapor deposition and ion-beam deposition processes. Tribological tests were performed on a reciprocating wear machine in open air (20 to 30% relative humidity) and under a 10-N load using SiC pins. For the test conditions explored, the steady- state friction coefficients of test pairs without a diamond or DLC film were 0.7 to 0.9 and the average wear rates of pins were 10{sup {minus}5} to 10{sup {minus}7} mm{sup 3}/N.m, depending on ambient temperature. DLC films reduced the steady-state friction coefficients of test pairs by factors of 3 to 5 and the wear rates of pins by two to three orders of magnitude. Low friction coefficients were also obtained with the diamond films, but wear rates of the counterface pins were high due to the very abrasive nature of these films. The wear of SiC disks coated with either diamond or DLC films was virtually unmeasurable while the wear of uncoated disks was substantial. Test results showed that the DLC films could afford low friction up to about 300{degrees}C. At higher temperatures, the DLC films became graphitized and were removed from the surface. The diamond films could withstand much higher temperatures, but their tribological behavior degraded. Raman spectroscopy and scanning electron microscopy were used to elucidate the friction and wear mechanisms of both films at high temperatures.

  14. Rescattering Effect and Near Threshold Enhancement of $p\\bar p$ System

    E-Print Network [OSTI]

    G. Y. Chen; H. R. Dong; J. P. Ma

    2008-06-28T23:59:59.000Z

    We study the observed enhancement of a $p\\bar p$ system near the threshold in the process $J/\\psi \\to \\gamma p\\bar p$ and $e^+ e^- \\to p\\bar p$. From early studies the enhancement can be explained by final state interactions, which are in general taken into account with some potential models. In this work we offer a simple approach within quantum field theory to explain the observed enhancement. We point out that among different final state interactions the rescattering in a $N\\bar N$ system though exchange of $\\pi$ is the most important. The effects of the rescattering is completely fixed by the well-known coupling $g_{\\pi NN}$. Our results show that the enhancement in $J/\\psi \\to \\gamma p\\bar p$ and $e^+ e^- \\to p\\bar p$ can be well described with the rescattering effects.

  15. carleton.ca/seo Arrive. Survive. Thrive.

    E-Print Network [OSTI]

    carleton.ca/seo Arrive. Survive. Thrive. Transition guide Your guide to a successful transition to university #12;2 carleton.ca/seo Arrive. Survive. Thrive. Welcome to Carleton University.The first year to help you through this new experience. The Student Experience Office (SEO) is your first stop when you

  16. COUNSELLING SERVICES STUDENTS.SFU.CA/HEALTH

    E-Print Network [OSTI]

    HEALTH AND COUNSELLING SERVICES STUDENTS.SFU.CA/HEALTH IDENTIFYING YOUR POSITIVE ATTRIBUTES 1 overcome - things that you have cared about - prizes, awards, good marks - things that you like about list even further is to think about people you have #12;HEALTH AND COUNSELLING SERVICESSTUDENTS.SFU.CA/HEALTH

  17. Ventilation and Infiltration in High-Rise Apartment Buildings Richard C. Diamond, Helmut E. Feustel and Darryl J. Dickerhoff

    E-Print Network [OSTI]

    Diamond, Richard

    1 Ventilation and Infiltration in High-Rise Apartment Buildings Richard C. Diamond, Helmut E to characterize the ventilation rates for the individual apartments. Parametric simulations were performed flow simulations suggest that the ventilation to the individual units varies considerably

  18. Design of diamond turned holograms by the nonlinear conjugate gradients method Colin Dankwart, Claas Falldorf and Jurgen Jahns

    E-Print Network [OSTI]

    Jahns, Jürgen

    Design of diamond turned holograms by the nonlinear conjugate gradients method Colin Dankwart investigate a different optimization approach, the nonlinear conjugate gradients (NCG) method. The NGC method design algorithm, based on the generalized projections method (GPM) [?] was established, taking

  19. Systematic studies of the nucleation and growth of ultrananocrystalline diamond films on silicon substrates coated with a tungsten layer

    SciTech Connect (OSTI)

    Chu, Yueh-Chieh; Jiang, Gerald [Institute of Microelectronics, No.1, University Road, Tainan 701, Taiwan (China); Tu, Chia-Hao [Institute of Nanotechnology and Microsystems Engineering, No.1, University Road, Tainan 701, Taiwan (China); Department of Materials Science and Engineering, National Cheng Kung University, No.1, University Road, Tainan 701, Taiwan (China); Chang Chi [Institute of Nanotechnology and Microsystems Engineering, No.1, University Road, Tainan 701, Taiwan (China); Liu, Chuan-pu; Ting, Jyh-Ming [Department of Materials Science and Engineering, National Cheng Kung University, No.1, University Road, Tainan 701, Taiwan (China); Lee, Hsin-Li [Industrial Technology Research Institute - South, Tainan 701, Taiwan (China); Tzeng, Yonhua [Institute of Microelectronics, No.1, University Road, Tainan 701, Taiwan (China); Advanced Optoelectronics Technology Center, No.1, University Road, Tainan 701, Taiwan (China); Auciello, Orlando [Argonne National Laboratory, Materials Science Division, 9700 S. Cass Avenue, Argonne, Illinois 60439 (United States)

    2012-06-15T23:59:59.000Z

    We report on effects of a tungsten layer deposited on silicon surface on the effectiveness for diamond nanoparticles to be seeded for the deposition of ultrananocrystalline diamond (UNCD). Rough tungsten surface and electrostatic forces between nanodiamond seeds and the tungsten surface layer help to improve the adhesion of nanodiamond seeds on the tungsten surface. The seeding density on tungsten coated silicon thus increases. Tungsten carbide is formed by reactions of the tungsten layer with carbon containing plasma species. It provides favorable (001) crystal planes for the nucleation of (111) crystal planes by Microwave Plasma Enhanced Chemical Vapor Deposition (MPECVD) in argon diluted methane plasma and further improves the density of diamond seeds/nuclei. UNCD films grown at different gas pressures on tungsten coated silicon which is pre-seeded by nanodiamond along with heteroepitaxially nucleated diamond nuclei were characterized by Raman scattering, field emission-scanning electron microscopy, and high resolution-transmission electron microscopy.

  20. Tests in Time: A Review of Natural Experiments of History, edited by Jared Diamond and James A. Robinson

    E-Print Network [OSTI]

    Currie, Thomas E

    2010-01-01T23:59:59.000Z

    on the island of Hispaniola (discussed in more detailCaribbean island of Hispaniola. Diamond wants to understandhave played a key role in Hispaniola’s history it is unclear

  1. Short pulse laser-induced optical damage and fracto-emission of amorphous, diamond-like carbon

    SciTech Connect (OSTI)

    SOKOLOWSKI-TINTEN,K.; VON DER LINDE,D.; SIEGAL,MICHAEL P.; OVERMYER,DONALD L.

    2000-02-07T23:59:59.000Z

    Short pulse laser damage and ablation of amorphous, diamond-like carbon films is investigated. Material removal is due to fracture of the film and ejection of large fragments, which exhibit a broadband emission of microsecond duration.

  2. Perfect alignment and preferential orientation of nitrogen-vacancy centers during CVD growth of diamond on (111) surfaces

    E-Print Network [OSTI]

    Julia Michl; Tokuyuki Teraji; Sebastian Zaiser; Ingmar Jakobi; Gerald Waldherr; Florian Dolde; Philipp Neumann; Marcus W. Doherty; Neil B. Manson; Junichi Isoya; Jörg Wrachtrup

    2014-02-11T23:59:59.000Z

    Synthetic diamond production is key to the development of quantum metrology and quantum information applications of diamond. The major quantum sensor and qubit candidate in diamond is the nitrogen-vacancy (NV) color center. This lattice defect comes in four different crystallographic orientations leading to an intrinsic inhomogeneity among NV centers that is undesirable in some applications. Here, we report a microwave plasma-assisted chemical vapor decomposition (MPCVD) diamond growth technique on (111)-oriented substrates that yields perfect alignment ($94\\pm2%$) of as-grown NV centers along a single crystallographic direction. In addition, clear evidence is found that the majority ($74\\pm4%$) of the aligned NV centers were formed by the nitrogen being first included in the (111) growth surface and then followed by the formation of a neighboring vacancy on top. The achieved homogeneity of the grown NV centers will tremendously benefit quantum information and metrology applications.

  3. The contact heat conductance at diamond-OFHC copper interface with GaIn eutectic as a heat transfer medium

    SciTech Connect (OSTI)

    Assoufid, L.; Khounsary, A.M.

    1996-01-01T23:59:59.000Z

    Results of an experimental study of the contact heat conductance across a single diamond crystal interface with OFHC copper (Cu) are reported. Gallium-indium (GaIn) eutectic was used as an interstitial material. Contact conductance data are important in the design and the prediction of the performance of x-ray diamond monochromators under high-heat-load conditions. Two sets of experiments were carried out. In one, the copper surface in contact with diamond was polished and then electroless plated with 1 {mu}m of nickel, while in the other, the copper contact surface was left as machined. Measured average interface heat conductances are 44.7 {plus_minus}8 W/cm{sup 2}{minus}K for nonplated copper and 23.0 {plus_minus}3 W/cm{sup 2}{minus}K for nickel-plated copper. For reference, the thermal contact conductances at a copper-copper interface (without diamond) were also measured, and the results are reported. A typical diamond monochromator, 0.2 mm thick, will absorb about 44 W under a standard undulator beam at the Advanced Photon Source. The measured conductance for nickel-plated copper suggests that the temperature drop across the interface of diamond and nickel-plated copper, with a 20 mm{sup 2} contact area, will be about 10{degree}C. Therefore temperature rises are rather modest, and the accuracy of the measured contact conductances presented here are sufficient for design purposes.

  4. Hybrid optics for the visible produced by bulk casting of sol-gel glass using diamond-turned molds

    SciTech Connect (OSTI)

    Bernacki, B.E.; Miller, A.C.; Maxey, L.C.; Cunningham, J.P. [Oak Ridge National Lab., TN (United States); Moreshead, W.V.; Nogues, J.L.R. [Geltech Inc., Alachua, FL (United States)

    1995-07-01T23:59:59.000Z

    Recent combinations of diffractive and refractive functions in the same optical component allow designers additional opportunities to make systems more compact and enhance performance. This paper describes a research program for fabricating hybrid refractive/diffractive components from diamond-turned molds using the bulk casting of sol-gel silica glass. The authors use the complementary dispersive nature of refractive and diffractive optics to render two-color correction in a single hybrid optical element. Since diamond turning has matured as a deterministic manufacturing technology, techniques previously suitable only in the infrared are now being applied to components used at visible wavelengths. Thus, the marriage of diamond turning and sol-gel processes offers a cost-effective method for producing highly customized and specialized optical components in high quality silica glass. With the sol-gel casting method of replication, diamond-turned mold costs can be shared over many pieces. Diamond turning takes advantage of all of the available degrees of freedom in a single hybrid optical element: aspheric surface to eliminate spherical aberration, kinoform surface for control of primary chromatic aberration, and the flexibility to place the kinoform on non-planar surfaces for maximum design flexibility. The authors discuss the critical issues involved in designing the hybrid element, single point diamond-turning the mold, and fabrication in glass using the sol-gel process.

  5. ORNL Trusted Corridors Project: Watts Bar Dam Inland Waterway Project

    SciTech Connect (OSTI)

    Walker, Randy M [ORNL; Gross, Ian G [ORNL; Smith, Cyrus M [ORNL; Hill, David E [ORNL

    2011-11-01T23:59:59.000Z

    Radiation has existed everywhere in the environment since the Earth's formation - in rocks, soil, water, and plants. The mining and processing of naturally occurring radioactive materials for use in medicine, power generation, consumer products, and industry inevitably generate emissions and waste. Radiological measuring devices have been used by industry for years to measure for radiation in undesired locations or simply identify radioactive materials. Since the terrorist attacks on the United States on 9-11-01 these radiation measuring devices have proliferated in many places in our nation's commerce system. DOE, TVA, the Army Corps and ORNL collaborated to test the usefulness of these devices in our nation's waterway system on this project. The purpose of the Watts Bar Dam ORNL Trusted Corridors project was to investigate the security, safety and enforcement needs of local, state and federal government entities for state-of-the-art sensor monitoring in regards to illegal cargo including utilization of the existing infrastructure. TVA's inland waterways lock system is a recognized and accepted infrastructure by the commercial carrier industry. Safety Monitoring activities included tow boat operators, commercial barges and vessels, recreational watercraft and their cargo, identification of unsafe vessels and carriers, and, monitoring of domestic and foreign commercial vessels and cargo identification. Safety Enforcement activities included cargo safety, tracking, identification of hazardous materials, waterway safety regulations, and hazardous materials regulations. Homeland Security and Law Enforcement Applications included Radiological Dispersive Devices (RDD) identification, identification of unsafe or illicit transport of hazardous materials including chemicals and radiological materials, and screening for shipments of illicit drugs. In the Fall of 2005 the SensorNet funding for the project expired. After several unsuccessful attempts to find a Federal sponsor to continue with the project, the Watts Bar Dam Project was canceled and the Exploranium radiation monitors were removed from the doors of Watts Bar Dam in early 2006. The DHS Domestic Nuclear Detection Office decided to proceed with a Pilot building on the ORNL work performed at the TN and SC weigh stations in the highway sector of the Trusted Corridors project and eventually expanded it to other southern states under the name of Southeastern Corridor Pilot Project (SETCP). Many of the Phase I goals were achieved however real-world test data of private watercraft and barges was never obtained.

  6. Role of the hadron molecule Lambda_c(2940) in the p bar(p) -> p D0 bar(Lambda)_c(2286) annihilation reaction

    E-Print Network [OSTI]

    Yubing Dong; Amand Faessler; Thomas Gutsche; Valery E. Lyubovitskij

    2014-11-03T23:59:59.000Z

    The annihilation process p bar(p) -> p D0 bar(Lambda)_c(2286) is studied taking into account t-channel D0, D*0 meson exchange and the resonance contribution of Lambda_c(2286) and Lambda_c(2940) baryons. We assume that the Lambda_c(2940) baryon is a pD*0 molecular state with spin-parity (1/2)+ and (1/2)-. Our results show that near the threshold of p bar(p) -> Lambda_c(2286) bar(Lambda)_c(2286) the contribution from the intermediate state Lambda_c(2940) is also sizeable and can be observed at the PANDA experiment. Another conclusion is that the spin-parity assignment (1/2)- for Lambda_c(2940) gives enhancement for the cross section in comparison with a choice (1/2)+.

  7. , ..., 23-25/5/2013 CaCO3,

    E-Print Network [OSTI]

    , - , . , , , . CaCO3, , . 200-800o C (XRD), (SEM), Raman, (BET). , CaCO3, , (PP) . « » (wet cup method). . .[1] (fillers) , , , .[2] CaCO3 (PP) .[3

  8. Angular distributions in $t{\\bar t}H (H\\rightarrow b\\bar{b})$ reconstructed events at the LHC

    E-Print Network [OSTI]

    Santos, S P Amor dos; Cantrill, R; Castro, N F; Fiolhais, M C N; Frederix, R; Gonçalo, R; Martins, R; Santos, R; Silva, J; Onofre, A; Peixoto, H; Reigoto, A

    2015-01-01T23:59:59.000Z

    The associated production of a Higgs boson and a top-quark pair, $t{\\bar t} H$, in proton-proton collisions is addressed in this paper for a center of mass energy of 13TeV at the LHC. Dileptonic final states of $t{\\bar t}H$ events with two oppositely charged leptons and four jets from the decays $t\\rightarrow bW^+ \\rightarrow b \\ell^+\

  9. Testing CPT Invariance in B^0_d-\\bar{B}^0_d and B^0_s-\\bar{B}^0_s Oscillations

    E-Print Network [OSTI]

    Ping Ren; Zhi-zhong Xing

    2007-10-27T23:59:59.000Z

    Recent CDF and D0 measurements of B^0_s-\\bar{B}^0_s mixing make it possible to search for CP violation and test CPT symmetry in a variety of B_s decays. Considering both coherent B^0_d\\bar{B}^0_d decays at the \\Upsilon (4S) resonance and coherent B^0_s\\bar{B}^0_s decays at the \\Upsilon (5S) resonance, we formulate their time-dependent and time-integrated rates by postulating small CPT violation in B^0_d-\\bar{B}^0_d and B^0_s-\\bar{B}^0_s oscillations. We show that the opposite-sign dilepton events from either C-odd or C-even B^0_q\\bar{B}^0_q states (for q = d or s) can be used to determine or constrain the CPT-violating parameter at a super-B factory. The possibility of distinguishing between the effect of CPT violation and that of \\Delta B = -\\Delta Q transitions is also discussed.

  10. Ab Initio Study of 40Ca with an Importance Truncated No-Core Shell Model

    SciTech Connect (OSTI)

    Roth, R; Navratil, P

    2007-05-22T23:59:59.000Z

    We propose an importance truncation scheme for the no-core shell model, which enables converged calculations for nuclei well beyond the p-shell. It is based on an a priori measure for the importance of individual basis states constructed by means of many-body perturbation theory. Only the physically relevant states of the no-core model space are considered, which leads to a dramatic reduction of the basis dimension. We analyze the validity and efficiency of this truncation scheme using different realistic nucleon-nucleon interactions and compare to conventional no-core shell model calculations for {sup 4}He and {sup 16}O. Then, we present the first converged calculations for the ground state of {sup 40}Ca within no-core model spaces including up to 16{h_bar}{Omega}-excitations using realistic low-momentum interactions. The scheme is universal and can be easily applied to other quantum many-body problems.

  11. Enabling data science and good research to inform ZEV policy

    E-Print Network [OSTI]

    California at Davis, University of

    Enabling data science and good research to inform ZEV policy PREPARED BY JAMIE DAVIES ZERO Headquarters, Diamond Bar, CA #12;Data science 101 Data science is the extraction of actionable ­ Longitudinal ­ Can inform if campaigns are working, or point to possible gaps ­ Help practice adaptive

  12. Microstrip post production tuning bar error and compact resonators using negative refractive index metamaterials

    E-Print Network [OSTI]

    Scher, Aaron David

    2005-08-29T23:59:59.000Z

    . Such tuning bars are used in microwave circuit designs to allow the impedance or length of a microstrip line to be adjusted after fabrication. In general, the tuning bars are simply patterns of small, isolated sections of conductor adjacent to the thru line...

  13. Detection of Broken Bars in Induction Motors Using an Extended Kalman Filter

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Detection of Broken Bars in Induction Motors Using an Extended Kalman Filter for Rotor Resistance and currents are processed by an Extended Kalman Filter for the speed and rotor resistance simultaneous bars. In the proposed extended Kalman Filter approach, the state covariance matrix is adequacy weighted

  14. Maximum Running Speed of Captive Bar-Headed Geese Is Unaffected by Severe Hypoxia

    E-Print Network [OSTI]

    Scott, Graham

    of Zoology, University of British Columbia, Vancouver, Canada, 6 Department of Biology, McMaster University lower than bar-headed geese. In bar-headed geese, partial pressures of oxygen and carbon dioxide in both Research Council (BBSRC) of the United Kingdom [Grant number BB/F015615/1] to CMB and PJB. The funders had

  15. Please consider the environment before printing Europe bars illegal timber from markets

    E-Print Network [OSTI]

    .U. markets. The legislation, which passed 644-25, will require all companies selling timber products in the EPlease consider the environment before printing Europe bars illegal timber from markets mongabay.com July 07, 2010 The European Parliament today voted overwhelming to bar illegally logged timber from E

  16. Observation of exclusive (B)over-bar -> (DK*-)-K-(*) decays

    E-Print Network [OSTI]

    Ammar, Raymond G.; Besson, David Zeke; Zhao, X.

    2002-03-01T23:59:59.000Z

    We report the first observation of the exclusive decays (B) over bar --> D-(*K-)*(-), using 9.66 x 10(6) B (B) over bar pairs collected at the Y(4S) with the CLEO detector. We measure the following branching fractions: B(B" --> (DK)-K-0*(-)) = (6...

  17. DESIGN GUIDELINES FOR CONCRETE BEAMS REINFORCED WITH MMFX MICROCOMPOSITE REINFORCING BARS

    E-Print Network [OSTI]

    DESIGN GUIDELINES FOR CONCRETE BEAMS REINFORCED WITH MMFX MICROCOMPOSITE REINFORCING BARS M. Dawood: Corrosion of steel reinforcement in concrete structures and bridges is a major problem facing for concrete beams and slabs. The behavior of concrete beams reinforced with MMFX reinforcing bars is evaluated

  18. Using Hubble Space Telescope Imaging of Nuclear Dust Morphology to Rule Out Bars Fueling Seyfert Nuclei

    E-Print Network [OSTI]

    Michael W. Regan; John S. Mulchaey

    1999-03-03T23:59:59.000Z

    If AGN are powered by the accretion of matter onto massive black holes, how does the gas in the host galaxy lose the required angular momentum to approach the black hole? Gas easily transfers angular momentum to stars in strong bars, making them likely candidates. Although ground-based searches for bars in active galaxies using both optical and near infrared surface brightness have not found any excess of bars relative to quiescent galaxies, the searches have not been able to rule out small-scale nuclear bars. To look for these nuclear bars we use HST WFPC2-NICMOS color maps to search for the straight dust lane signature of strong bars. Of the twelve Seyfert galaxies in our sample, only three have dust lanes consistent with a strong nuclear bar. Therefore, strong nuclear bars cannot be the primary fueling mechanism for Seyfert nuclei. We do find that a majority of the galaxies show an spiral morphology in their dust lanes. These spiral arms may be a possible fueling mechanism.

  19. Measurement of the Mass Difference between t and t[over-bar] Quarks

    E-Print Network [OSTI]

    Bauer, Gerry P.

    We present a direct measurement of the mass difference between t and t[over-bar] quarks using tt[over-bar] candidate events in the lepton+jets channel, collected with the CDF II detector at Fermilab’s 1.96 TeV Tevatron ...

  20. Low-temperature electrical transport in B-doped ultrananocrystalline diamond film

    SciTech Connect (OSTI)

    Li, Lin; Zhao, Jing; Hu, Zhaosheng; Quan, Baogang; Li, Junjie, E-mail: jjli@iphy.ac.cn; Gu, Changzhi, E-mail: czgu@iphy.ac.cn [Beijing National Laboratory for Condensed Matter Physics, Institution of Physics Chinese Academy of Sciences, Beijing 100190 (China)

    2014-05-05T23:59:59.000Z

    B-doped ultrananocrystalline diamond (UNCD) films are grown using hot-filament chemical vapor deposition method, and their electrical transport properties varying with temperature are investigated. When the B-doped concentration of UNCD film is low, a step-like increase feature of the resistance is observed with decreasing temperature, reflecting at least three temperature-modified electronic state densities at the Fermi level according to three-dimensional Mott's variable range hopping transport mechanism, which is very different from that of reported B-doped nanodiamond. With increasing B-doped concentration, a superconductive transformation occurs in the UNCD film and the highest transformation temperature of 5.3?K is observed, which is higher than that reported for superconducting nanodiamond films. In addition, the superconducting coherence length is about 0.63?nm, which breaks a reported theoretical and experimental prediction about ultra-nanoscale diamond's superconductivity.

  1. Local and bulk 13C hyperpolarization in NV-centered diamonds at variable fields and orientations

    E-Print Network [OSTI]

    Alvarez, Gonzalo A; Fischer, Ran; London, Paz; Kanda, Hisao; Onoda, Shinobu; Isoya, Junichi; Gershoni, David; Frydman, Lucio

    2014-01-01T23:59:59.000Z

    Polarizing nuclear spins is of fundamental importance in biology, chemistry and physics. Methods for hyperpolarizing 13C nuclei from free electrons in bulk, usually demand operation at cryogenic temperatures. Room-temperature approaches targeting diamonds with nitrogen-vacancy (NV) centers could alleviate this need, but hitherto proposed strategies lack generality as they demand stringent conditions on the strength and/or alignment of the magnetic field. We report here an approach for achieving efficient electron->13C spin alignment transfers, compatible with a broad range of magnetic field strengths and field orientations with respect to the diamond crystal. This versatility results from combining coherent microwave- and incoherent laser-induced transitions between selected energy states of the coupled electron-nuclear spin manifold. 13C-detected Nuclear Magnetic Resonance (NMR) experiments demonstrate that this hyperpolarization can be transferred via first-shell or via distant 13Cs, throughout the nuclear ...

  2. Diamond pixel detector for beam profile monitoring in COMET experiment at J-PARC

    E-Print Network [OSTI]

    M. Cerv; P. Sarin; H. Pernegger; P. Vageesvaran; E. Griesmayer

    2014-11-15T23:59:59.000Z

    We present the design and initial prototype results of a pixellized proton beam profile monitor for the COMET experiment at J-PARC. The goal of COMET is to look for charged lepton flavor violation by direct muon to electron conversion at a sensitivity of $0^{-19}$. An 8 GeV proton beam pulsed at 100 ns with $10^{10}$ protons/s will be used to create muons through pion production and decay. In the final experiment, the proton flux will be raised to $10^{14}$ protons/sec to increase the sensitivity. These requirements of harsh radiation tolerance and fast readout make diamond a good choice for constructing a beam profile monitor in COMET. We present first results of the characterization of single crystal diamond (scCVD) sourced from a new company, 2a systems Singapore. Our measurements indicate excellent charge collection efficiency and high carrier mobility down to cryogenic temperatures.

  3. Spectrally dependent photovoltages in Schottky photodiode based on (100) B-doped diamond

    SciTech Connect (OSTI)

    ?ermák, Jan, E-mail: cermakj@fzu.cz; Rezek, Bohuslav [Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 16200 Prague 6 (Czech Republic); Koide, Yasuo [Sensor Materials Center, National Institute for Material Science (NIMS), 1-1 Namiki, Tsukuba 305-0044 (Japan); Takeuchi, Daisuke [Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba 305-8568 (Japan)

    2014-02-07T23:59:59.000Z

    Spectrally and spatially resolved photovoltages were measured by Kelvin probe force microscopy (KPFM) on a Schottky photo-diode made of a 4?nm thin tungsten-carbide (WC) layer on a 500?nm oxygen-terminated boron-doped diamond epitaxial layer (O-BDD) that was grown on a Ib (100) diamond substrate. The diode was grounded by the sideways ohmic contact (Ti/WC), and the semitransparent Schottky contact was let unconnected. The electrical potentials across the device were measured in dark (only 650?nm LED of KPFM being on), under broad-band white light (halogen lamp), UV (365?nm diode), and deep ultraviolet (deuterium lamp) illumination. Illumination induced shift of the electrical potential remains within 210?mV. We propose that the photovoltage actually corresponds to a shift of Fermi level inside the BDD channel and thereby explains orders of magnitude changes in photocurrent.

  4. Scanning localized magnetic fields in a microfluidic device using single spin in a nano-diamond

    E-Print Network [OSTI]

    Lim, Kangmook; Shapiro, Benjamin; Taylor, Jacob M; Waks, Edo

    2014-01-01T23:59:59.000Z

    Nitrogen vacancy (NV) color centers in diamond have emerged as highly versatile optical emitters that exhibit room temperature spin properties. These characteristics make NV centers ideal for magnetometry which plays an important role in a broad range of chemical and biological sensing applications. The integration of NV magnetometers with microfluidic systems could enable the study of isolated chemical and biological samples in a fluid environment with high spatial resolution. Here we demonstrate a method to perform localized magnetometry with nanometer spatial precision using a single NV center in a microfluidic device. We manipulate a magnetic particle within a liquid environment using a combination of planar flow control and vertical magnetic actuation to achieve 3-dimensional manipulation. A diamond nanocrystal containing a single NV center is deposited in the microfluidic channels and acts as a local magnetic field probe. We map out the magnetic field distribution of the magnetic particle by varying its...

  5. Heteroepitaxial ZnO films on diamond: Optoelectronic properties and the role of interface polarity

    SciTech Connect (OSTI)

    Schuster, Fabian, E-mail: Fabian.Schuster@wsi.tum.de; Hetzl, Martin; Garrido, Jose A.; Stutzmann, Martin [Walter Schottky Institut, Technische Universität München, Am Coulombwall 4, 85748 Garching (Germany); Magén, Cesar [Laboratorio de Microscopías Avanzadas (LMA) - Instituto de Nanociencia de Aragon (INA) and Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50018 Zaragoza (Spain); Fundación ARAID, 50018 Zaragoza (Spain); Arbiol, Jordi [Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus de la UAB, 08193 Bellaterra, CAT (Spain); Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, CAT (Spain)

    2014-06-07T23:59:59.000Z

    We demonstrate the growth of heteroepitaxial ZnO films on (110) diamond substrates by molecular beam epitaxy and report on a major advance in structural quality, as confirmed by XRD and high-resolution TEM measurements. The growth direction is found to be along the polar c-axis with Zn-polarity, deduced from annular bright-field scanning transmission electron microscopy imaging. This is important information, as simulations of the electronic band structure reveal the ZnO polarity to dominate the electronic structure of the interface: the formation of a two-dimensional electron gas on the ZnO side or a two-dimensional hole gas on the diamond side are predicted for Zn- and O-polarity, respectively. In addition, photoluminescence and absorption studies exhibit good optical properties and reveal stimulated emission for optical excitation above a threshold of 30?kW/cm{sup 2}.

  6. Electroless vs electrodeposited Ni-P alloys for diamond turning applications

    SciTech Connect (OSTI)

    Dini, J.W.

    1991-07-01T23:59:59.000Z

    Electrolytes nickel deposits with greater than 10% phosphorous have been widely used for diamond turning applications such as fabrications of large optics and other high precision parts. Although the coatings have worked well, they are not without their drawbacks. Porosity and nodule formation have been problems as well as the difficulty of obtaining deposits greater than about 75 {mu}m. In recent years much effort has been directed at the investigating electrodeposition of Ni-P alloys in an attempt to avoid these problems. The purpose of this paper is to compare diamond turning results for both electroless and electrodeposited alloys and speculate about the future uses of electrodeposited Ni-P for precision finishing applications. 16 refs., 7 figs.

  7. Flexible electron field emitters fabricated using conducting ultrananocrystalline diamond pyramidal microtips on polynorbornene films

    SciTech Connect (OSTI)

    Sankaran, K. J.; Tai, N. H., E-mail: nhtai@mx.nthu.edu.tw [Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu 300, Taiwan (China); Lin, I. N., E-mail: inanlin@mail.tku.edu.tw [Department of Physics, Tamkang University, Tamsui 251, Taiwan (China)

    2014-01-20T23:59:59.000Z

    High performance flexible field emitters made of aligned pyramidal shaped conducting ultrananocrystalline diamond (C-UNCD) microtips on polynorbornene substrates is demonstrated. Flexible C-UNCD pyramidal microtips show a low turn-on field of 1.80?V/?m with a field enhancement factor of 4580 and a high emission current density of 5.8?mA/cm{sup 2} (at an applied field of 4.20?V/?m) with life-time stability of 210 min. Such an enhancement in the field emission is due to the presence of sp{sup 2}-graphitic sheath with a nanowire-like diamond core. This high performance flexible C-UNCD field emitter is potentially useful for the fabrication of diverse, flexible electronic devices.

  8. 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

  9. Microstructural Response of Variably Hydrated Ca-Rich Montmorillonite...

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

    Microstructural Response of Variably Hydrated Ca-Rich Montmorillonite to Supercritical CO2. Microstructural Response of Variably Hydrated Ca-Rich Montmorillonite to Supercritical...

  10. Natural Abundance 43Ca NMR Spectroscopy of Tobermorite and Jennite...

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

    which has limited our ability to understand the structure of, for example, Ca–silicate hydrate (C–S–H). 43Ca nuclear magnetic resonance (NMR) spectroscopy has...

  11. No-Core Shell Model for 48-Ca, 48-Sc and 48-Ti

    SciTech Connect (OSTI)

    Popescu, S; Stoica, S; Vary, J P; Navratil, P

    2004-10-26T23:59:59.000Z

    The authors report the first no-core shell model results for {sup 48}Ca, {sup 48}Sc and {sup 48}Ti with derived and modified two-body Hamiltonians. We use an oscillator basis with a limited {bar h}{Omega} range around 40/A{sup 1/3} = 11 MeV and a limited model space up to 1 {bar h}{Omega}. No single-particle energies are used. They find that the charge dependence of the bulk binding energy of eight A = 48 nuclei is reasonably described with an effective Hamiltonian derived from the CD-Bonn interaction while there is an overall underbinding by about 0.4 MeV/nucleon. However, resulting spectra exhibit deficiencies that are anticipated due to: (1) basis space limitations and/or the absence of effective many-body interactions; and, (2) the absence of genuine three-nucleon interactions. They introduce phenomenological modifications to obtain fits to total binding and low-lying spectra. The resulting no-core shell model opens a path for applications to experiments such as the double-beta ({beta}{beta}) decay process.

  12. Energy Dependence of $?$ and $\\bar?$ Production at CERN-SPS Energies

    E-Print Network [OSTI]

    A. Mischke

    2002-09-04T23:59:59.000Z

    Rapidity distributions for $\\Lambda$ and $\\bar{\\Lambda}$ hyperons in central Pb-Pb collisions at 40, 80 and 158 A$\\cdot$GeV and for ${\\rm K}_{s}^{0}$ mesons at 158 A$\\cdot$GeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the $\\Lambda/\\pi$ and $\\bar{\\Lambda}/\\pi$ is observed. The $\\bar{\\Lambda}/\\Lambda$ ratio shows a steep increase with collision energy. Evidence for a $\\bar{\\Lambda}/\\bar{\\rm p}$ ratio greater than 1 is found at 40 A$\\cdot$GeV.

  13. Signal transduction and conversion with color centers in diamond and piezo-elements

    E-Print Network [OSTI]

    Jianming Cai; Fedor Jelezko; Martin B. Plenio

    2014-04-25T23:59:59.000Z

    The ability to measure weak signals such as pressure, force, electric field, and temperature with nanoscale devices and high spatial resolution offers a wide range of applications in fundamental and applied sciences. Here we present a proposal for a hybrid device composed of thin film layers of diamond with color centers implanted and piezo-active elements for the transduction and measurement of a wide variety of physical signals. The magnetic response of a piezomagnetic layer to an external stress or a stress induced by the change of electric field and temperature is shown to affect significantly the spin properties of nitrogen-vacancy centers in diamond. Under ambient conditions, realistic environmental noise and material imperfections, our detailed numerical studies show that this hybrid device can achieve significant improvements in sensitivity over the pure diamond based approach in combination with nanometer scale spatial resolution. Beyond its applications in quantum sensing the proposed hybrid architecture offers novel possibilities for engineering strong coherent couplings between nanomechanical oscillator and solid state spin qubits.

  14. Local and bulk 13C hyperpolarization in NV-centered diamonds at variable fields and orientations

    E-Print Network [OSTI]

    Gonzalo A. Alvarez; Christian O. Bretschneider; Ran Fischer; Paz London; Hisao Kanda; Shinobu Onoda; Junichi Isoya; David Gershoni; Lucio Frydman

    2014-12-30T23:59:59.000Z

    Polarizing nuclear spins is of fundamental importance in biology, chemistry and physics. Methods for hyperpolarizing 13C nuclei from free electrons in bulk, usually demand operation at cryogenic temperatures. Room-temperature approaches targeting diamonds with nitrogen-vacancy (NV) centers could alleviate this need, but hitherto proposed strategies lack generality as they demand stringent conditions on the strength and/or alignment of the magnetic field. We report here an approach for achieving efficient electron->13C spin alignment transfers, compatible with a broad range of magnetic field strengths and field orientations with respect to the diamond crystal. This versatility results from combining coherent microwave- and incoherent laser-induced transitions between selected energy states of the coupled electron-nuclear spin manifold. 13C-detected Nuclear Magnetic Resonance (NMR) experiments demonstrate that this hyperpolarization can be transferred via first-shell or via distant 13Cs, throughout the nuclear bulk ensemble. This method opens new perspectives for applications of diamond NV centers in NMR, and in quantum information processing.

  15. Effect of Decreasing of Cobalt Content in Properties for Diamond/Cemented Carbide Tools

    SciTech Connect (OSTI)

    Waratta, A.; Hamdi, M. [Department of Design and Manufacture, Faculty of Engineering, University of Malaya (Malaysia); Ariga, T. [Department of Materials Science, School of Engineering, Tokai University (Japan)

    2010-03-11T23:59:59.000Z

    Powder metallurgy plays a role in manufacturing such as automotive and cutting tool applications. Diamond/cemented carbide tools are also made from this technique. Diamond particle and other matrix materials were employed in this study. The purpose is to investigate the physical and mechanical properties of different Cobalt (Co) content samples by using Taguchi's method. The materials used in the experiments were mixed by using a ball-mill machine. The mixed powders were pressed by conventional method. Then the green samples were sintered in a vacuum furnace. After reaching 500 deg. C, the samples were sintered with Argon (Ar) gas. The sintered samples were investigated density by immersion method, porosity by water saturation method, and hardness by Vicker hardness tester. It was found that with 59.5% Co content, plain diamond type, sintering temperature of 950 deg. C, sintering time of 40 minutes, and pressure of 625 MPa, density, porosity, and hardness got the best result in this study. From the Taguchi's analysis, the significant factors effected the performance were composition, sintering temperature, and sintering time.

  16. Test of a prototype neutron spectrometer based on diamond detectors in a fast reactor

    E-Print Network [OSTI]

    M. Osipenko; F. Pompili; M. Ripani; M. Pillon; G. Ricco; B. Caiffi; R. Cardarelli; G. Verona-Rinati; S. Argiro

    2015-05-23T23:59:59.000Z

    A prototype of neutron spectrometer based on diamond detectors has been developed. This prototype consists of a $^6$Li neutron converter sandwiched between two CVD diamond crystals. The radiation hardness of the diamond crystals makes it suitable for applications in low power research reactors, while a low sensitivity to gamma rays and low leakage current of the detector permit to reach good energy resolution. A fast coincidence between two crystals is used to reject background. The detector was read out using two different electronic chains connected to it by a few meters of cable. The first chain was based on conventional charge-sensitive amplifiers, the other used a custom fast charge amplifier developed for this purpose. The prototype has been tested at various neutron sources and showed its practicability. In particular, the detector was calibrated in a TRIGA thermal reactor (LENA laboratory, University of Pavia) with neutron fluxes of $10^8$ n/cm$^2$s and at the 3 MeV D-D monochromatic neutron source named FNG (ENEA, Rome) with neutron fluxes of $10^6$ n/cm$^2$s. The neutron spectrum measurement was performed at the TAPIRO fast research reactor (ENEA, Casaccia) with fluxes of 10$^9$ n/cm$^2$s. The obtained spectra were compared to Monte Carlo simulations, modeling detector response with MCNP and Geant4.

  17. Test of a prototype neutron spectrometer based on diamond detectors in a fast reactor

    E-Print Network [OSTI]

    Osipenko, M; Ripani, M; Pillon, M; Ricco, G; Caiffi, B; Cardarelli, R; Verona-Rinati, G; Argiro, S

    2015-01-01T23:59:59.000Z

    A prototype of neutron spectrometer based on diamond detectors has been developed. This prototype consists of a $^6$Li neutron converter sandwiched between two CVD diamond crystals. The radiation hardness of the diamond crystals makes it suitable for applications in low power research reactors, while a low sensitivity to gamma rays and low leakage current of the detector permit to reach good energy resolution. A fast coincidence between two crystals is used to reject background. The detector was read out using two different electronic chains connected to it by a few meters of cable. The first chain was based on conventional charge-sensitive amplifiers, the other used a custom fast charge amplifier developed for this purpose. The prototype has been tested at various neutron sources and showed its practicability. In particular, the detector was calibrated in a TRIGA thermal reactor (LENA laboratory, University of Pavia) with neutron fluxes of $10^8$ n/cm$^2$s and at the 3 MeV D-D monochromatic neutron source na...

  18. A gas-rich nuclear bar fuelling a powerful central starburst in NGC 2782

    E-Print Network [OSTI]

    Shardha Jogee; Jeffrey D. P. Kenney; Beverly J. Smith

    1999-07-07T23:59:59.000Z

    We present evidence that the peculiar interacting starburst galaxy NGC 2782 (Arp 215) harbors a gas-rich nuclear stellar bar feeding an M82-class powerful central starburst, from a study based on OVRO CO (J=1->0) data, WIYN BVR & Halpha observations, along with available NIR images, a 5 GHz RC map and HST images. NGC 2782 harbors a clumpy, bar-like CO feature of radius ~ 7.5'' (1.3 kpc) which leads a nuclear stellar bar of similar size. The nuclear CO bar is massive: it contains ~2.5x10**9 M_sun of molecular gas, which makes up ~ 8 % of the dynamical'mass present within a 1.3 kpc radius. Within the CO bar, emission peaks in two extended clumpy lobes which lie on opposite sides of the nucleus, separated by ~ 6'' (1 kpc). Between the CO lobes, in the inner 200 pc radius, resides a powerful central starburst which is forming stars at a rate of 3 to 6 M_sun yr-1. While circular motions dominate the CO velocity field, the CO lobes show weak bar-like streaming motions on the leading side of the nuclear stellar bar, suggestive of gas inflow. We estimate semi-analytically the gravitational torque from the nuclear stellar bar on the gas, and suggest large gas inflow rates from the CO lobes into the central starburst. These observations, which are amongst the first ones showing a nuclear stellar bar fuelling molecular gas into an intense central starburst, are consistent with simulations and theory which suggest that nuclear bars provide an efficient way of transporting gas closer to the galactic center to fuel central activity. Furthermore, several massive clumps are present at low radii, and dynamical friction might produce further gas inflow. We suggest that the nuclear molecular gas bas and central activity will be very short-lived, likely disappearing within 5x10**8 years.

  19. Measurement of the electron charge asymmetry in $\\boldsymbol{p\\bar{p}\\rightarrow W+X \\rightarrow e?+X}$ decays in $\\boldsymbol{p\\bar{p}}$ collisions at $\\boldsymbol{\\sqrt{s}=1.96}$ TeV

    E-Print Network [OSTI]

    D0 Collaboration

    2015-01-27T23:59:59.000Z

    We present a measurement of the electron charge asymmetry in $p\\bar{p}\\rightarrow W+X \\rightarrow e\

  20. Measurement of the electron charge asymmetry in $\\boldsymbol{p\\bar{p}\\rightarrow W+X \\rightarrow e?+X}$ decays in $\\boldsymbol{p\\bar{p}}$ collisions at $\\boldsymbol{\\sqrt{s}=1.96}$ TeV

    E-Print Network [OSTI]

    D0 Collaboration

    2015-04-10T23:59:59.000Z

    We present a measurement of the electron charge asymmetry in $p\\bar{p}\\rightarrow W+X \\rightarrow e\

  1. SQA(TM): Surface Quality Assured Steel Bar Program

    SciTech Connect (OSTI)

    Tzyy-Shuh Chang; Jianjun Shi; Shiyu Zhou

    2009-03-03T23:59:59.000Z

    OG Technologies, Inc. (OGT) has led this SQA (Surface Quality Assured Steel Bar) program to solve the major surface quality problems plaguing the US special quality steel bars and rods industry and their customers, based on crosscutting sensors and controls technologies. Surface defects in steel formed in a hot rolling process are one of the most common quality issues faced by the American steel industry, accounting for roughly 50% of the rejects or 2.5% of the total shipment. Unlike other problems such as the mechanical properties of the steel product, most surface defects are sporadic and cannot be addressed based on sampling techniques. This issue hurts the rolling industry and their customers in their process efficiency and operational costs. The goal of this program is to develop and demonstrate an SQA prototype, with synergy of HotEye® and other innovations, that enables effective rolling process control and efficient quality control. HotEye®, OGT’s invention, delivers high definition images of workpieces at or exceeding 1,450?C while the workpieces travel at 100 m/s. The elimination of surface defect rejects will be achieved through the integration of imaging-based quality assessment, advanced signal processing, predictive process controls and the integration with other quality control tools. The SQA program team, composed of entities capable of and experienced in (1) research, (2) technology manufacturing, (3) technology sales and marketing, and (4) technology end users, is very strong. There were 5 core participants: OGT, Georgia Institute of Technology (GIT), University of Wisconsin (UW), Charter Steel (Charter) and ArcelorMittal Indiana Harbor (Inland). OGT served as the project coordinator. OGT participated in both research and commercialization. GIT and UW provided significant technical inputs to this SQA project. The steel mills provided access to their rolling lines for data collection, design of experiments, host of technology test and verification, and first-hand knowledge of the most advanced rolling line operation in the US. This project lasted 5 years with 5 major tasks. The team successfully worked through the tasks with deliverables in detection, data analysis and process control. Technologies developed in this project were commercialized as soon as they were ready. For instance, the advanced surface defect detection algorithms were integrated into OGT’s HotEye® RSB systems late 2005, resulting in a more matured product serving the steel industry. In addition to the commercialization results, the SQA team delivered 7 papers and 1 patent. OGT was also recognized by two prestigious awards, including the R&D100 Award in 2006. To date, this SQA project has started to make an impact in the special bar quality industry. The resulted product, HotEye® RSB systems have been accepted by quality steel mills worldwide. Over 16 installations were completed, including 1 in Argentina, 2 in Canada, 2 in China, 2 in Germany, 2 in Japan, and 7 in the U.S. Documented savings in reduced internal rejects, improved customer satisfaction and simplified processes were reported from various mills. In one case, the mill reported over 50% reduction in its scrap, reflecting a significant saving in energy and reduction in emission. There exist additional applications in the steel industry where the developed technologies can be used. OGT is working toward bringing the developed technologies to more applications. Examples are: in-line inspection and process control for continuous casting, steel rails, and seamless tube manufacturing.

  2. A Kinematic Link between Boxy Bulges, Stellar Bars, and Nuclear Activity in NGC 3079 & NGC 4388

    E-Print Network [OSTI]

    S. Veilleux; J. Bland-Hawthorn; G. Cecil

    1999-07-30T23:59:59.000Z

    We present direct kinematic evidence for bar streaming motions in two active galaxies with boxy stellar bulges. The Hawaii Imaging Fabry-Perot Interferometer was used on the Canada-France-Hawaii 3.6-m telescope and the University of Hawaii 2.2-m telescope to derive the two-dimensional velocity field of the line-emitting gas in the disks of the Sc galaxy NGC 3079 and the Sb galaxy NGC 4388. In contrast to previous work based on long-slit data, the detection of the bar potential from the Fabry-Perot data does not rely on the existence of inner Lindblad resonances or strong bar-induced shocks. Simple kinematic models which approximate the intrinsic gas orbits as nonintersecting, inclined elliptical annuli that conserve angular momentum characterize the observed velocity fields. Box-shaped bulges in both NGC 3079 and NGC 4388 are confirmed using new near-infrared images to reduce dust obscuration. Morphological analysis of starlight in these galaxies is combined with the gas kinematics derived from the Fabry-Perot spectra to test evolutionary models of stellar bars that involve transitory boxy bulges, and to quantify the importance of such bars in fueling active nuclei. Our data support the evolutionary bar models, but fail to prove convincingly that the stellar bars in NGC 3079 and NGC 4388 directly trigger or sustain the nuclear activity. (abridged)

  3. Preparation of CaCO3 General concepts

    E-Print Network [OSTI]

    Csonka, Gábor István

    Preparation of CaCO3 General concepts precipitation, solubility, ageing, Oswald ripening During the experiment CaCO3 is produced by an ion-exchange reaction: the ions of the desired product are dissolved. The yield of the reaction is calculated from the Na2CO3 + CaCl2 = CaCO3 + 2NaCl equation. Procedure

  4. Multiple C-terminal tail Ca2 /CaMs regulate

    E-Print Network [OSTI]

    Lim, Wendell

    Findeisen1,2 , Elizabeth S Cooley1,2 , Ehud Y Isacoff3,4,5,7 and Daniel L Minor Jr1,2,6,7, * 1- region is labile, whereas Ca2þ /CaM bound to the IQ domain is not. Furthermore, neither of lobes of apo

  5. Temperature dependence of d7 Ca and Li/Ca during growth

    E-Print Network [OSTI]

    Temperature dependence of d7 Li, d44 Ca and Li/Ca during growth of calcium carbonate Caedmon S; calcium isotopes; calcium carbonate 1. Introduction The trace element and isotope chemistry of calci- um variable, in controlling the fraction- ation of three such potential proxies in calcium carbonates

  6. Contact heat conductance at a diamond-OFHC copper interface with GaIn eutectic as a heat transfer medium

    SciTech Connect (OSTI)

    Assoufid, L.; Khounsary, A. [Experimental Facilities Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)] [Experimental Facilities Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

    1996-09-01T23:59:59.000Z

    The results of an experimental study of the contact heat conductance across a single diamond crystal interface with OFHC copper (Cu) are reported. Gallium-indium (GaIn) eutectic was used as an interstitial material. Contact conductance data are important in the design and the prediction of the performance of x-ray optics under high-heat-load conditions. Two sets of experiments were carried out. In one, the copper surface in contact with diamond was polished and then electroless plated with 1 {mu}m of nickel, while in the other, the copper contact surface was left as machined. The measured average interface heat conductances are 44.7{plus_minus}8 W/cm{sup 2}-K for nonplated copper and 23.0{plus_minus}8 W/cm{sup 2}-K for nickel-plated copper. For reference, the thermal contact conductances at a copper-copper interface (without diamond) were also measured, and the results are reported. A typical diamond monochromator, 0.2 mm thick, will absorb about 44 W under a standard undulator beam at the Advanced Photon Source. The measured conductance for nickel-plated copper suggests that the temperature drop across the interface of diamond and nickel-plated copper, with a 20 mm {sup 2}contact area, will be about 10{degree}C. Therefore temperature rises are rather modest, and the accuracy of the measured contact conductances presented here are sufficient for design purposes. {copyright} {ital 1996 American Institute of Physics.}

  7. Neutron diffraction study of the crystal structure and structural phase transition of La{sub 0.7}Ca{sub 0.3-x}Sr{sub x}CrO{sub 3} (0<=x<=0.3)

    SciTech Connect (OSTI)

    Omoto, Kazuki [Department of Integrated Sciences in Physics and Biology, College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajousui, Setagaya-ku, Tokyo 156-8550 (Japan); Norberg, Stefan T. [Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg (Sweden); ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX (United Kingdom); Hull, Steve [ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX (United Kingdom); Aoto, Akimitsu [Department of Integrated Sciences in Physics and Biology, College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajousui, Setagaya-ku, Tokyo 156-8550 (Japan); Hashimoto, Takuya, E-mail: takuya@chs.nihon-u.ac.j [Department of Integrated Sciences in Physics and Biology, College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajousui, Setagaya-ku, Tokyo 156-8550 (Japan)

    2010-02-15T23:59:59.000Z

    The crystal structure of the La{sub 0.7}Ca{sub 0.3-x}Sr{sub x}CrO{sub 3} series, including the compositional and temperature dependence of the structural parameters, has been studied by variable temperature neutron diffraction measurements. The extent of the distortions from the ideal cubic perovskite structure has been evaluated quantitatively using the average bond lengths and the mean volumes of the [CrO{sub 6}] octahedron and [(La/Ca/Sr)O{sub 12}] polyhedron, and has been shown to decrease with increase of Sr content or temperature. At the structural phase transition from the orthorhombic (Pnma) structure to the rhombohedral (R3-barc) one, the volume of the [CrO{sub 6}] octahedron decreases whereas that of the [(La/Ca/Sr)O{sub 12}] polyhedron shows little difference, resulting in an overall decrease in the level of distortion. The change in the degree of distortion at the phase transition decreases with increase of Sr content, in agreement with the smaller variation of the enthalpy and volume for the specimens with higher Sr content. - Graphical abstract: Temperature dependence of parameter, PHI, representing the extent of distortion from the ideal cubic perovskite structure, for La{sub 0.7}Ca{sub 0.3}CrO{sub 3} (diamonds) and La{sub 0.7}Ca{sub 0.15}Sr{sub 0.15}CrO{sub 3} (circles) calculated from neutron diffraction patterns.

  8. Inhibitors of the Ca{sup 2+}/calmodulin-dependent protein kinase phosphatase family (CaMKP and CaMKP-N)

    SciTech Connect (OSTI)

    Sueyoshi, Noriyuki; Takao, Toshihiko; Nimura, Takaki; Sugiyama, Yasunori; Numano, Takamasa [Department of Life Sciences, Faculty of Agriculture, Kagawa University, Ikenobe 2393, Miki-cho, Kagawa 761-0795 (Japan); Shigeri, Yasushi [National Institute of Advanced Industrial Science and Technology, Osaka 563-8577 (Japan); Taniguchi, Takanobu [Department of Biochemistry, Asahikawa Medical College, Asahikawa 078-8510 (Japan); Kameshita, Isamu [Department of Life Sciences, Faculty of Agriculture, Kagawa University, Ikenobe 2393, Miki-cho, Kagawa 761-0795 (Japan)], E-mail: kamesita@ag.kagawa-u.ac.jp; Ishida, Atsuhiko [Department of Biochemistry, Asahikawa Medical College, Asahikawa 078-8510 (Japan); Laboratory of Molecular Brain Science, Graduate School of Integrated Arts and Sciences, Hiroshima University, 1-7-1, Kagamiyama, Higashi-Hiroshima 739-8521 (Japan)], E-mail: aishida@hiroshima-u.ac.jp

    2007-11-23T23:59:59.000Z

    Ca{sup 2+}/calmodulin-dependent protein kinase phosphatase (CaMKP) and its nuclear isoform CaMKP-N are unique Ser/Thr protein phosphatases that negatively regulate the Ca{sup 2+}/calmodulin-dependent protein kinase (CaMK) cascade by dephosphorylating multifunctional CaMKI, II, and IV. However, the lack of specific inhibitors of these phosphatases has hampered studies on these enzymes in vivo. In an attempt to obtain specific inhibitors, we searched inhibitory compounds and found that Evans Blue and Chicago Sky Blue 6B served as effective inhibitors for CaMKP. These compounds also inhibited CaMKP-N, but inhibited neither protein phosphatase 2C, another member of PPM family phosphatase, nor calcineurin, a typical PPP family phosphatase. The minimum structure required for the inhibition was 1-amino-8-naphthol-4-sulfonic acid. When Neuro2a cells cotransfected with CaMKIV and CaMKP-N were treated with these compounds, the dephosphorylation of CaMKIV was strongly suppressed, suggesting that these compounds could be used as potent inhibitors of CaMKP and CaMKP-N in vivo as well as in vitro.

  9. Measurements of the CKM Angle Alpha at BaBar

    SciTech Connect (OSTI)

    Stracka, Simone; /Milan U. /INFN, Milan; ,

    2012-04-04T23:59:59.000Z

    The authors present improved measurements of the branching fractions and CP-asymmetries fin the B{sup 0} {yields} {pi}{sup +}{pi}{sup -}, B{sup 0} {yields} {pi}{sup 0}{pi}{sup 0}, and B{sup +} {yields} {rho}{sup +}{rho}{sup 0} decays, which impact the determination of {alpha}. The combined branching fractions of B {yields} K{sub 1}(1270){pi} and B {yields} K{sub 1}(1400){pi} decays are measured for the first time and allow a novel determination of {alpha} in the B{sup 0} {yields} {alpha}{sub 1}(1260){sup {+-}}{pi}{sup {-+}} decay channel. These measurements are performed using the final dataset collected by the BaBar detector at the PEP-II B-factory. The primary goal of the experiments based at the B factories is to test the Cabibbo-Kobayashi-Maskawa (CKM) picture of CP violation in the standard model of electroweak interactions. This can be achieved by measuring the angles and sides of the Unitarity Triangle in a redundant way.

  10. On Baryogenesis and $n \\bar n$-Oscillations

    E-Print Network [OSTI]

    Enrico Herrmann

    2014-08-19T23:59:59.000Z

    We study a simple model where color sextet scalars violate baryon number at tree level but do not give rise to proton decay. In particular, we include one light and two heavy sextets with $\\Delta B=2$ baryon number violating interactions that induce neutron anti-neutron oscillations. This setup also suggests an intimate connection to the generation of the observed baryon asymmetry in the Universe via the out of equilibrium decay of the heavy sextet scalars at around $10^{14}$ GeV. The large $SU(3)$-color charges of the scalar fields involved in generating the baryon asymmetry motivate us to study potentially significant washout effects. We numerically solve a set of Boltzmann evolution equations and find restrictions on the available model parameters imposed by successful high scale baryogenesis. Combining our new numerical results for baryogenesis with $n\\bar n$-oscillation predictions and collider limits on the light sextet, we identify parameter regions where this model can be probed by current and future experiments.

  11. Ab initio investigation of lithium on the diamond C(100) surface K. M. O'Donnell,1,2,* T. L. Martin,2,3 N. A. Fox,3 and D. Cherns3

    E-Print Network [OSTI]

    Bristol, University of

    for diamond thermionic converters currently of interest for solar power generation and heat recycling. INTRODUCTION Diamond is a promising photocathode, field emitter, and thermionic emitter due to its chemical of approximately 400 °C, too low for thermionic applications.3 As such, research into diamond thermionics has

  12. Nucleon form factors and final state radiative corrections to $e^+e^-\\to \\bar p p ?$

    E-Print Network [OSTI]

    Henryk Czyz; Johann H. Kuhn; Szymon Tracz

    2014-11-19T23:59:59.000Z

    New parametrisation for the electric and the magnetic form factors of proton and neutron are presented. The proton form factors describe well the recent measurements by BaBar collaboration and earlier ones of the ratio of the form factors in space-like region. The neutron form factors are consistent with earlier measurements of neutron pair production and ratio of the form factors in the space-like region. These form factors are implemented into the generator PHOKHARA, which simulates the reactions $e^+e^-\\to \\bar p p \\gamma$ and $e^+e^-\\to \\bar n n\\gamma$. The influence of final state radiation is investigated.

  13. Giant-Resonances in Ca-40

    E-Print Network [OSTI]

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

    1981-01-01T23:59:59.000Z

    PHYSICAL REVIE%' C VOLUME 24, NUMBER 3 SEPTEMBER 1981 Giant resonances in Ca Y.-W. Lui, J. D. Bronson, C. M. Rozsa, * D. H. Youngblood, P. Bogucki, and U. Garg Cyclotron Institute, Texas ActM Uniuersity, College Station, Texas 77843 (Received... LUI, BRONSON, ROZSA, YOUNGBLOOD, SOGUCKI, AND GARG 24 I I Ca(o, a'} Eg = )16.8 MeV 8L= 2.5' Ca(u e') Ea=IP9.4 MeV 80- 8L =o 100- eO- 40 80 J3 ~ ~0 bmIJJ C4 15 8-5L a) 20 E b blN 40- 30 t 'He 20 IO 0 I I e, =a IA ++ +0 (4ON...

  14. Isoscalar giant resonances in (48)Ca

    E-Print Network [OSTI]

    Lui, Y. -W; Youngblood, David H.; Shlomo, S.; Chen, X.; Tokimoto, Y.; Krishichayan; Anders, M.; Button, J.

    2011-01-01T23:59:59.000Z

    PHYSICAL REVIEW C 83, 044327 (2011) Isoscalar giant resonances in 48Ca Y.-W. Lui, D. H. Youngblood, S. Shlomo, X. Chen,* Y. Tokimoto,? Krishichayan, M. Anders, and J. Button Cyclotron Institute, Texas A&M University, College Station, Texas 77843...-10556-2813/2011/83(4)/044327(11) ?2011 American Physical Society Y.-W. LUI et al. PHYSICAL REVIEW C 83, 044327 (2011) 48Ca ? c.m. = 1.1o 0 50 100 150 200 d2 ?? ?? /d ?? ?? dE (m b/s r M eV ) 48Ca ? c.m.= 4.3o 0 20 40 60 80 100 0 10 20 30 40 50 60 Ex(MeV) d2...

  15. W. N. WANGet al.: Laser Raman Studies of Polycrystalline and A-Diamond Films 255 phys. stat. sol. (a) 154,255 (1996)

    E-Print Network [OSTI]

    Bristol, University of

    1996-01-01T23:59:59.000Z

    W. N. WANGet al.: Laser Raman Studies of Polycrystalline and A-Diamond Films 255 phys. stat. sol, Transducer Systems Division, Wotton-under-Edge4)(d) Laser Raman Studies of Polycrystalline and Amorphic Diamond Films W. N. WANG(a), N. A. FOX(a), P. W. MAY(b), M. P. KNAPPER(b), G. MEADEN(c), P. G. PARTRIDGE

  16. CVD POLYCRYSTALLINE DIAMOND HIGH-Q MICROMECHANICAL RESONATORS Jing Wang, James E. Butler*, D. S. Y. Hsu*, and Clark T.-C. Nguyen

    E-Print Network [OSTI]

    Nguyen, Clark T.-C.

    CVD POLYCRYSTALLINE DIAMOND HIGH-Q MICROMECHANICAL RESONATORS Jing Wang, James E. Butler*, D. S. Y one variant of approach (3), in which CVD polycrystalline diamond material, with an acoustic velocity@engin.umich.edu ABSTRACT Chemical Vapor Deposited (CVD) polycrystalline dia- mond material, with an acoustic velocity

  17. JOURNAL OF MATERIALS SCIENCE LETTERS, 14 (1995) 1448-1450 A technique for the manufacture of long hollow diamond fibres by

    E-Print Network [OSTI]

    Bristol, University of

    1995-01-01T23:59:59.000Z

    standard 1448 Wire Figure i Schematic diagram of tungsten wire helical coil wound around a metallic, to form a continuous diamond coated coil is to =x/R, where R is the diamond deposition rate. If D > 2x a helical tungsten wire coil. The diameter of the tungsten wire was in the range dl= 10-20 gm. The coil

  18. Abstract. Calmodulin (CaM), a primary Ca2+ in all eukaryotic cells, is a multifunctional protein that

    E-Print Network [OSTI]

    Zielinski, Ray

    -characterized members of this protein family in plants are calmodulin (CaM) and the CaM-like domain protein kinases of a variety of target proteins, known as CaM-binding proteins, generating physiological re- sponses eukaryotes and some of which are unique to plants (Zielinski 1998). Because CaM is ubiquitously expressed

  19. Porous, Biphasic CaCO3-Calcium Phosphate Biomedical Cement Scaffolds from Calcite (CaCO3) Powder

    E-Print Network [OSTI]

    Tas, A. Cuneyt

    Porous, Biphasic CaCO3-Calcium Phosphate Biomedical Cement Scaffolds from Calcite (CaCO3) Powder A porous, biocompatible, and resorb- able materials. Commercially available CaCO3 powders were physically crystallographically and spectroscopically resembled calcium hydroxyapatite. Upon mixing CaCO3 powders and the setting

  20. approaches-stir bar sorptive: Topics by E-print Network

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

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