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


1

Well drilling tool with diamond radial/thrust bearings  

SciTech Connect (OSTI)

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.

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

1983-10-18T23:59:59.000Z

2

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

Broader source: Energy.gov [DOE]

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

3

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

SciTech Connect (OSTI)

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.

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

2012-11-28T23:59:59.000Z

4

Design of high temperature high speed electromagnetic axial thrust bearing  

E-Print Network [OSTI]

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

Mohiuddin, Mohammad Waqar

2002-01-01T23:59:59.000Z

5

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

E-Print Network [OSTI]

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

Desireddy, Vijesh R.

2010-01-14T23:59:59.000Z

6

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

E-Print Network [OSTI]

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

DeWeese, Randall Thomas

1996-01-01T23:59:59.000Z

7

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

DOE Patents [OSTI]

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.

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

2002-01-01T23:59:59.000Z

8

Investigation into the failure cause of a double-acting, leading-edge-groove, tilting-pad thrust bearing. Final report, Feb-Aug 90  

SciTech Connect (OSTI)

This report describes the results of bench tests simulating operation and failure of a thrust bearing used in a gas turbine engine compressor development test rig. The bearing was a double acting, tilting pad with offset pivot, leading edge groove configuration using an AMS 4928 titanium collar and C18200 copper-chrome alloy pads with a No. 2 babbitt face. The bench tests successfully simulated the bearing failure and demonstrated a materials incompatibility. This was supported by visual examination, scanning electron microscopy and X-ray energy spectroscopy. A comparison of the bench test results to the compressor rig bearing failure is provided to support the report conclusions.

Peterson, B.K.

1990-10-01T23:59:59.000Z

9

Measuring axial pump thrust  

DOE Patents [OSTI]

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

Suchoza, B.P.; Becse, I.

1988-11-08T23:59:59.000Z

10

Measuring axial pump thrust  

DOE Patents [OSTI]

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

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

1988-01-01T23:59:59.000Z

11

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

E-Print Network [OSTI]

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

Esser, Paul R.

2011-08-08T23:59:59.000Z

12

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

SciTech Connect (OSTI)

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.

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

2011-12-31T23:59:59.000Z

13

Down hole drilling motor with pressure balanced bearing seals  

SciTech Connect (OSTI)

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

McDonald, W.J.

1981-01-27T23:59:59.000Z

14

Down hole drilling motor with pressure balanced bearing seals  

SciTech Connect (OSTI)

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

Maurer, W.C.

1980-09-30T23:59:59.000Z

15

Diamond fiber field emitters  

DOE Patents [OSTI]

A field emission electron emitter comprising an electrode formed of at least one diamond, diamond-like carbon or glassy carbon composite fiber, said composite fiber having a non-diamond core and a diamond, diamond-like carbon or glassy carbon coating on said non-diamond core, and electronic devices employing such a field emission electron emitter.

Blanchet-Fincher, Graciela B. (Wilmington, DE); Coates, Don M. (Santa Fe, NM); Devlin, David J. (Los Alamos, NM); Eaton, David F. (Wilmington, DE); Silzars, Aris K. (Landenburg, PA); Valone, Steven M. (Santa Fe, NM)

1996-01-01T23:59:59.000Z

16

E-Print Network 3.0 - aluminium-based journal bearing Sample...  

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

of the microbearing system lies in a small journal-bearing... system drag (journal plus thrust bear- ings). The design output power of this turbine is on the order... , the...

17

E-Print Network 3.0 - aerostatic journal bearing Sample Search...  

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

of the microbearing system lies in a small journal-bearing... system drag (journal plus thrust bear- ings). The design output power of this turbine is on the order... , the...

18

Bearing system  

DOE Patents [OSTI]

A bearing system includes backup bearings for supporting a rotating shaft upon failure of primary bearings. In the preferred embodiment, the backup bearings are rolling element bearings having their rolling elements disposed out of contact with their associated respective inner races during normal functioning of the primary bearings. Displacement detection sensors are provided for detecting displacement of the shaft upon failure of the primary bearings. Upon detection of the failure of the primary bearings, the rolling elements and inner races of the backup bearings are brought into mutual contact by axial displacement of the shaft.

Kapich, Davorin D. (Carlsbad, CA)

1987-01-01T23:59:59.000Z

19

A simplified thermohydrodynamic model for fluid film bearings. Final report, February 15, 1992--February 15, 1994  

SciTech Connect (OSTI)

We aim to develop a simplified yet realistic model of fluid film lubrication under thermohydrodynamic conditions, with significant thermal and elastic deformation of the bearing pads. The principal thrust is transfer of technology from the researcher to the industrial designer: the end product will include two user-friendly computer programs, one for journal bearings and the other for thrust bearings, to be used for bearing design in interactive mode on a personal computer.

Szeri, A.Z. [Pittsburgh Univ., PA (United States). Dept. of Mechanical Engineering

1994-03-01T23:59:59.000Z

20

CFES RESEARCH THRUSTS: Energy Storage  

E-Print Network [OSTI]

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

Lü, James Jian-Qiang

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


21

Lubrication for high load duplex bearings  

SciTech Connect (OSTI)

Three ES and H-compatible lubricants (Environment, Safety and Health) for high load duplex bearing applications were evaluated and compared against trichlorotrifluoroethane (Freon) deposition of low molecular weight polytetrafluoroethylene (PTFE) bearing lubricant extracted from Vydax{trademark}. Vydax is a product manufactured by DuPont consisting of various molecular weights of PTFE suspended in trichlorotrifluoroethane (Freon) which is an ozone-depleting solvent. Bearings with Supercritical CO{sub 2} deposition of PTFE extracted from Vydax AR/IPA, bearings with titanium carbide coated balls, and bearings with diamond-like carbon races and retainers were evaluated. Bearings with Supercritical CO{sub 2} deposition of PTFE from Vydax AR/IPA performed as well as bearings with Freon deposition of PTFE from Freon-based Vydax.

Steinhoff, R.G.

1997-08-01T23:59:59.000Z

22

Diamond and Polycrystalline Diamond for MEMS Applications: Simulations and Experiments  

E-Print Network [OSTI]

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

Çagin, Tahir

23

CURRICULUM VITAE Howard J. Diamond  

E-Print Network [OSTI]

______________________ CURRICULUM VITAE FOR Howard J. Diamond ______________________ NOAA.diamond@noaa.gov or hjdiamond45@gmail.com #12;Curriculum Vitae Mr. Howard Jeffrey Diamond NOAA/National Climatic Data Center

24

San Juan Montana Thrust Belt WY Thrust Belt Black Warrior  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -the Mid-Infrared0 ResourceAwardsSafeguards andSan Juan Montana Thrust Belt WY

25

Diamond films: Historical perspective  

SciTech Connect (OSTI)

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.

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

1993-01-01T23:59:59.000Z

26

Diamond nucleation using polyethene  

DOE Patents [OSTI]

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.

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

2013-07-23T23:59:59.000Z

27

Diamond nanobeam waveguide optomechanics  

E-Print Network [OSTI]

Optomechanical devices sensitively transduce and actuate motion of nanomechanical structures using light, and are central to many recent fundamental studies and technological advances. Single--crystal diamond promises to improve the performance of optomechanical devices, while also providing opportunities to interface nanomechanics with diamond color center spins and related quantum technologies. Here we demonstrate measurement of diamond nanobeam resonators with a sensitivity of 9.5 fm/Hz^0.5 and bandwidth >120 nm through dissipative waveguide--optomechanical coupling. Nanobeams are fabricated from bulk single--crystal diamond using a scalable quasi--isotropic oxygen plasma undercut etching process, and support mechanical resonances with quality factor of 2.5 x 10^5 at room temperature, and 7.2 x 10^5 in cryogenic conditions (5K). Mechanical self--oscillations, resulting from interplay between optomechanical coupling and the photothermal response of nanobeams in a buckled state, are observed with amplitude e...

Khanaliloo, Behzad; Hryciw, Aaron C; Lake, David P; Kaviani, Hamidreza; Barclay, Paul E

2015-01-01T23:59:59.000Z

28

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

E-Print Network [OSTI]

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

Wilkes, Jason Christopher

2012-02-14T23:59:59.000Z

29

Ultratough, Thermally Stable Polycrystalline Diamond/Silicon...  

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

Ultratough, Thermally Stable Polycrystalline DiamondSilicon Carbide Nanocomposites for Drill Bits Ultratough, Thermally Stable Polycrystalline DiamondSilicon Carbide...

30

Diamond-graphite field emitters  

DOE Patents [OSTI]

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

Valone, Steven M. (Santa Fe, NM)

1997-01-01T23:59:59.000Z

31

US Synthetic Corp (TRL 4 Component) - The Development of Open...  

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

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

32

CVD diamond - fundamental phenomena  

SciTech Connect (OSTI)

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.

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

1993-01-01T23:59:59.000Z

33

Diamond nanobeam waveguide optomechanics  

E-Print Network [OSTI]

Optomechanical devices sensitively transduce and actuate motion of nanomechanical structures using light, and are central to many recent fundamental studies and technological advances. Single--crystal diamond promises to improve the performance of optomechanical devices, while also providing opportunities to interface nanomechanics with diamond color center spins and related quantum technologies. Here we demonstrate measurement of diamond nanobeam resonators with a sensitivity of 9.5 fm/Hz^0.5 and bandwidth >120 nm through dissipative waveguide--optomechanical coupling. Nanobeams are fabricated from bulk single--crystal diamond using a scalable quasi--isotropic oxygen plasma undercut etching process, and support mechanical resonances with quality factor of 2.5 x 10^5 at room temperature, and 7.2 x 10^5 in cryogenic conditions (5K). Mechanical self--oscillations, resulting from interplay between optomechanical coupling and the photothermal response of nanobeams in a buckled state, are observed with amplitude exceeding 200 nm, and are accompanied by nonlinear mechanical softening.

Behzad Khanaliloo; Harishankar Jayakumar; Aaron C. Hryciw; David P. Lake; Hamidreza Kaviani; Paul E. Barclay

2015-02-06T23:59:59.000Z

34

Lower pressure synthesis of diamond material  

DOE Patents [OSTI]

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.

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

35

Structure and properties of diamond and diamond-like films  

SciTech Connect (OSTI)

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.

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

1993-01-01T23:59:59.000Z

36

Fuel Optimal Thrust Allocation in Dynamic Positioning  

E-Print Network [OSTI]

vessels with diesel-electric power system. In this paper the focus is on using the thrust allocation to make the diesel generators on board the vessel work more fuel efficiently, by reducing the total fuel consumption of all online diesel generators. A static model for the fuel consumption of a diesel generator

Johansen, Tor Arne

37

Diamond turning of glass  

SciTech Connect (OSTI)

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

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

1988-12-01T23:59:59.000Z

38

Diamond films treated with alkali-halides  

DOE Patents [OSTI]

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.

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

1997-04-08T23:59:59.000Z

39

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

E-Print Network [OSTI]

STRUCTURE OF THE EASTERN RED ROCKS AND WIND RIDGE THRUST FAULTS, WYOMING: HOW A THRUST FAULT GAINS DISPLACEMENT ALONG STRIKE A Thesis by BRENT STANLEY HUNTSMAN Submitted to the Graduate College of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE December 1983 Major Subject: Geology STRUCTURE OF THE EASTERN RED ROCKS AND WIND RIDGE THRUST FAULTS, WYOMING: HOW A THRUST FAULT GAINS DISPLACEMENT ALONG STRIKE A Thesis by BRENT STANLEY HUNTSMAN...

Huntsman, Brent Stanley

1983-01-01T23:59:59.000Z

40

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

E-Print Network [OSTI]

-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

Bristol, University of

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


41

High efficiency diamond solar cells  

DOE Patents [OSTI]

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.

Gruen, Dieter M. (Downers Grove, IL)

2008-05-06T23:59:59.000Z

42

UV photoemission efficiency of polycrystalline CVD diamond films  

E-Print Network [OSTI]

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

Tremsin, A S; Siegmund, OHW

2005-01-01T23:59:59.000Z

43

A subpicotesla diamond magnetometer  

E-Print Network [OSTI]

Diamond defect centers are promising solid state magnetometers. Single centers allow for high spatial resolution field imaging but are limited in their magnetic field sensitivity to around 10 nT/Hz^(1/2) at room-temperature. Using defect center ensembles sensitivity can be scaled as N^(1/2) when N is the number of defects. In the present work we use an ensemble of 1e11 defect centers for sensing. By carefully eliminating all noise sources like laser intensity fluctuations, microwave amplitude and phase noise we achieve a photon shot noise limited field sensitivity of 0.9 pT/Hz^(1/2) at room-temperature with an effective sensor volume of 8.5e-4 mm^3. The smallest field we measured with our device is 100 fT. While this denotes the best diamond magnetometer sensitivity so far, further improvements using decoupling sequences and material optimization could lead to fT/Hz^(1/2) sensitivity.

Thomas Wolf; Philipp Neumann; Kazuo Nakamura; Hitoshi Sumiya; Junichi Isoya; Jörg Wrachtrup

2014-12-19T23:59:59.000Z

44

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

SciTech Connect (OSTI)

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.

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

1989-06-01T23:59:59.000Z

45

Amorphous-diamond electron emitter  

DOE Patents [OSTI]

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.

Falabella, Steven (Livermore, CA)

2001-01-01T23:59:59.000Z

46

Method of Dehalogenation using Diamonds  

SciTech Connect (OSTI)

A method for preparing olefins and halogenated olefins is provided comprising contacting halogenated compounds with diamonds for a sufficient time and at a sufficient temperature to convert the halogenated compounds to olefins and halogenated olefins via elimination reactions.

Farcasiu, Malvina; Kaufman, Phillip B.; Ladner, Edward P.; Anderson, Richard R.

1999-02-26T23:59:59.000Z

47

DIAMOND CHEMICAL VAPOR DEPOSITION Nucleation and Early Growth Stages  

E-Print Network [OSTI]

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

Dandy, David

48

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

E-Print Network [OSTI]

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

Bristol, University of

49

Secondary Production of Massive Quarks in Thrust  

E-Print Network [OSTI]

We present a factorization framework that takes into account the production of heavy quarks through gluon splitting in the thrust distribution for e+ e- --> hadrons. The explicit factorization theorems and some numerical results are displayed in the dijet region where the kinematic scales are widely separated, which can be extended systematically to the whole spectrum. We account for the necessary two-loop matrix elements, threshold corrections, and include resummation up to N3LL order. We include nonperturbative power corrections through a field theoretical shape function, and remove the O(Lambda_QCD) renormalon in the partonic soft function by appropriate mass-dependent subtractions. Our results hold for any value of the quark mass, from an infinitesimally small (merging to the known massless result) to an infinitely large one (achieving the decoupling limit). This is the first example of an application of a variable flavor number scheme to final state jets.

Andre H. Hoang; Vicent Mateu; Piotr Pietrulewicz

2014-12-22T23:59:59.000Z

50

Double bevel construction of a diamond anvil  

DOE Patents [OSTI]

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.

Moss, W.C.

1987-02-06T23:59:59.000Z

51

Electronics Engineering Department Thrust Area report FY'84  

SciTech Connect (OSTI)

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

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

1984-01-01T23:59:59.000Z

52

Method of Forming Diamonds from Carbonaceous Material  

SciTech Connect (OSTI)

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

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

1999-11-30T23:59:59.000Z

53

Diamond Thin Films Handbook David S. Dandy  

E-Print Network [OSTI]

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

Dandy, David

54

Diamond and diamond-like films for transportation applications  

SciTech Connect (OSTI)

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.

Perez, J.M.

1993-01-01T23:59:59.000Z

55

Recent Results on Diamond Radiation Tolerance  

E-Print Network [OSTI]

-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

Seidel, Sally

56

Diamond-silicon carbide composite  

DOE Patents [OSTI]

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.

Qian, Jiang; Zhao, Yusheng

2006-06-13T23:59:59.000Z

57

Method for machining steel with diamond tools  

DOE Patents [OSTI]

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.

Casstevens, J.M.

1984-01-01T23:59:59.000Z

58

Method for machining steel with diamond tools  

DOE Patents [OSTI]

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.

Casstevens, John M. (Greenville, TX)

1986-01-01T23:59:59.000Z

59

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

SciTech Connect (OSTI)

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

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

1990-11-01T23:59:59.000Z

60

Hybrid methods for interplanetary low-thrust trajectory optimization  

E-Print Network [OSTI]

Hybrid methods for interplanetary low-thrust trajectory optimization are proposed. These methods are combinations of selected, existing methods for trajectory optimization. The focus of this thesis is to obtain solutions to a class of trajectories...

Aroonwilairut, Krisada

2002-01-01T23:59:59.000Z

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


61

Thrust Network Analysis : exploring three-dimensional equilibrium  

E-Print Network [OSTI]

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

Block, Philippe (Philippe Camille Vincent)

2009-01-01T23:59:59.000Z

62

Construction and performance of an inverted pendulum thrust balance  

E-Print Network [OSTI]

The objective of the work in this thesis was to devise a means of profiling the thrust of the MIT Space Propulsion Lab's (SPL) Diverging Cusped Field (DCF) thruster and, more generally, other thrusters of similar size and ...

Tartler, Brett R. (Brett Robert)

2010-01-01T23:59:59.000Z

63

Magnetic properties of aggregate polycrystalline diamond: implications for carbonado history  

E-Print Network [OSTI]

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

Kletetschka, Gunther

64

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

SciTech Connect (OSTI)

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.

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

1995-12-01T23:59:59.000Z

65

Diamond-silicon carbide composite and method  

DOE Patents [OSTI]

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.

Zhao, Yusheng (Los Alamos, NM)

2011-06-14T23:59:59.000Z

66

Diamond turning machine controller implementation  

SciTech Connect (OSTI)

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.

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

1988-12-01T23:59:59.000Z

67

Diamond turning of thermoplastic polymers  

SciTech Connect (OSTI)

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.

Smith, E.; Scattergood, R.O.

1988-12-01T23:59:59.000Z

68

All diamond self-aligned thin film transistor  

DOE Patents [OSTI]

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.

Gerbi, Jennifer (Champaign, IL)

2008-07-01T23:59:59.000Z

69

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

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

April 1, 2011 EA-1795: Final Environmental Assessment Loan Guarantee to Diamond Green Diesel, LLC for Construction of the Diamond Green Diesel Facility in Norco, Louisiana April...

70

Double bevel construction of a diamond anvil  

DOE Patents [OSTI]

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.

Moss, W.C.

1988-10-11T23:59:59.000Z

71

Energy Harvesting Diamond Channel with Energy Cooperation  

E-Print Network [OSTI]

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

Ulukus, Sennur

72

Fracture of synthetic diamond M. D. Droty  

E-Print Network [OSTI]

Fracture of synthetic diamond M. D. Droty Ctystallume, 3506 Bassett Street, Santa Clara, California 1995) The fracture behavior of synthetic diamond has been investigated using indentation methods and by the tensile testing of pre-notched fracture-mechanics type samples. Specifically, the fracture toughness

Ritchie, Robert

73

Fluorinated diamond bonded in fluorocarbon resin  

DOE Patents [OSTI]

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.

Taylor, Gene W. (Los Alamos, NM)

1982-01-01T23:59:59.000Z

74

Problems of millipound thrust measurement. The "Hansen Suspension"  

SciTech Connect (OSTI)

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

Carta, David G.

2014-03-31T23:59:59.000Z

75

Diamond as an inert substrate of graphene  

SciTech Connect (OSTI)

Interaction between graphene and semiconducting diamond substrate has been examined with large-scale density functional theory calculations. Clean and hydrogenated diamond (100) and (111) surfaces have been studied. It turns out that weak van der Waals interactions dominate for graphene on all these surfaces. High carrier mobility of graphene is almost not affected, except for a negligible energy gap opening at the Dirac point. No charge transfer between graphene and diamond (100) surfaces is detected, while different charge-transfer complexes are formed between graphene and diamond (111) surfaces, inducing either p-type or n-type doping on graphene. Therefore, diamond can be used as an excellent substrate of graphene, which almost keeps its electronic structures at the same time providing the flexibility of charge doping.

Hu Wei; Li Zhenyu; Yang Jinlong [Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China)

2013-02-07T23:59:59.000Z

76

Multi-length Scale Modeling of CVD of Diamond Films  

E-Print Network [OSTI]

) 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

Grujicic, Mica

77

Appendix A SIMS profiles of hydrogen and deuterium in diamond  

E-Print Network [OSTI]

.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

Goddard III, William A.

78

Nanofocusing optics for synchrotron radiation made from polycrystalline diamond  

E-Print Network [OSTI]

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

Bristol, University of

79

Centrifugally decoupling touchdown bearings  

DOE Patents [OSTI]

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

Post, Richard F

2014-06-24T23:59:59.000Z

80

Passive magnetic bearing system  

DOE Patents [OSTI]

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

Post, Richard F.

2014-09-02T23:59:59.000Z

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


81

Thrust allocation with power management functionality on dynamically positioned vessels  

E-Print Network [OSTI]

world-wide. The main benefits of diesel-electric propulsion and thrusters are reduced power consumptionThrust allocation with power management functionality on dynamically positioned vessels Aleksander to assist the power management system on dynamically positioned ships is proposed in this paper. Its main

Johansen, Tor Arne

82

ORIGINAL PAPER Granite magma migration and emplacement along thrusts  

E-Print Network [OSTI]

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

Galland, Olivier

83

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

SciTech Connect (OSTI)

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

NONE

1996-02-01T23:59:59.000Z

84

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

E-Print Network [OSTI]

.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

Bristol, University of

85

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

E-Print Network [OSTI]

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

Yu, Jie

2012-01-01T23:59:59.000Z

86

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

E-Print Network [OSTI]

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

Muramatsu, Yasuji

2009-01-01T23:59:59.000Z

87

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

DOE Patents [OSTI]

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.

Gruen, Dieter M.

2012-09-04T23:59:59.000Z

88

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

DOE Patents [OSTI]

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.

Gruen, Dieter M. (Downers Grove, IL)

2009-08-11T23:59:59.000Z

89

Thrust Area Report, Engineering Research, Development and Technology  

SciTech Connect (OSTI)

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

Langland, R. T.

1997-02-01T23:59:59.000Z

90

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

E-Print Network [OSTI]

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

Roy, Subrata

91

Conceptual design of a thrust-vectoring tailcone for underwater robotics  

E-Print Network [OSTI]

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

Nawrot, Michael T

2012-01-01T23:59:59.000Z

92

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

E-Print Network [OSTI]

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

Brock, William Gene

1973-01-01T23:59:59.000Z

93

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

SciTech Connect (OSTI)

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.

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

94

Amorphous Diamond MEMS and Sensors  

SciTech Connect (OSTI)

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.

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

95

DRAFT Bear Safety Plan  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed Newcatalyst phases onOrganizationElectronic2005-2007 Budget Dear Ms.1 Subject:234Bear

96

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

E-Print Network [OSTI]

of an inverted-pendulum thrust stand to measure thrust for high-power steady- state plasma thrusters is presentedA Thrust Stand for High-power Steady-state Plasma Thrusters L.D. Cassady, A.D. Kodys, and E Department Princeton University, Princeton, New Jersey 08544 (Dated: July 18, 2002) The operation

Choueiri, Edgar

97

Late Cenozoic partitioning of oblique plate convergence in the Zagros fold-and-thrust belt (Iran)  

E-Print Network [OSTI]

Late Cenozoic partitioning of oblique plate convergence in the Zagros fold-and-thrust belt (Iran of oblique plate convergence in the Zagros fold-and-thrust belt (Iran), Tectonics, 25, TC3002, doi:10.1029/2005TC001860. 1. Introduction [2] The Zagros fold-and-thrust belt of southern Iran, the longest

Paris-Sud XI, Université de

98

Electronic Impact of Inclusions in Diamond  

SciTech Connect (OSTI)

X-ray topography data are compared with photodiode responsivity maps to identify potential candidates for electron trapping in high purity, single crystal diamond. X-ray topography data reveal the defects that exist in the diamond material, which are dominated by non-electrically active linear dislocations. However, many diamonds also contain defects configurations (groups of threading dislocations originating from a secondary phase region or inclusion) in the bulk of the wafer which map well to regions of photoconductive gain, indicating that these inclusions are a source of electron trapping which affect the performance of diamond X-ray detectors. It was determined that photoconductive gain is only possible with the combination of an injecting contact and charge trapping in the near surface region. Typical photoconductive gain regions are 0.2 mm across; away from these near-surface inclusions the device yields the expected diode responsivity.

Muller, E.M.; Smedley, J.; Raghothamachar, B.; Gaowei, M.; Keister, J.W.; Ben-Zvi, I.; Dudley, M.; Wu, Q.

2010-04-07T23:59:59.000Z

99

Effective placement of detectors at diamond interchanges  

E-Print Network [OSTI]

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...

Prabhakar, Dayakar

1994-01-01T23:59:59.000Z

100

EVALUATION OF A LOW FRICTION - HIGH EFFICIENCY ROLLER BEARING ENGINE  

SciTech Connect (OSTI)

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

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

2009-06-30T23:59:59.000Z

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


101

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

E-Print Network [OSTI]

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

Melnik, Roderick

102

Diamond film growth argon-carbon plasmas  

DOE Patents [OSTI]

A method and system are disclosed for manufacturing diamond film. The method involves forming a carbonaceous vapor, providing a gas stream of argon, hydrogen and hydrocarbon 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 and deposition of a diamond film on a substrate. 29 figs.

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

1998-12-15T23:59:59.000Z

103

Diamond film growth from fullerene precursors  

DOE Patents [OSTI]

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.

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

1997-04-15T23:59:59.000Z

104

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

SciTech Connect (OSTI)

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

Not Available

1994-05-01T23:59:59.000Z

105

Direct thrust measurement of a permanent magnet helicon double layer thruster  

SciTech Connect (OSTI)

Direct thrust measurements of a permanent magnet helicon double layer thruster have been made using a pendulum thrust balance and a high sensitivity laser displacement sensor. At the low pressures used (0.08 Pa) an ion beam is detected downstream of the thruster exit, and a maximum thrust force of about 3 mN is measured for argon with an rf input power of about 700 W. The measured thrust is proportional to the upstream plasma density and is in good agreement with the theoretical thrust based on the maximum upstream electron pressure.

Takahashi, K.; Lafleur, T.; Charles, C.; Alexander, P.; Boswell, R. W. [Space Plasma, Power and Propulsion Group, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Perren, M.; Laine, R. [ASTRIUM-EADS, 6 rue Laurent Pichat, 75016 Paris (France); Pottinger, S.; Lappas, V.; Harle, T.; Lamprou, D. [Surrey Space Centre, University of Surrey, Guildford GU2 7XH (United Kingdom)

2011-04-04T23:59:59.000Z

106

Electric sail control mode for amplified transverse thrust  

E-Print Network [OSTI]

The electric solar wind sail produces thrust by centrifugally spanned high voltage tethers interacting with the solar wind protons. The sail attitude can be controlled and attitude maneuvers are possible by tether voltage modulation synchronous with the sail rotation. Especially, the sail can be inclined with respect to the solar wind direction to obtain transverse thrust to change the osculating orbit angular momentum. Such an inclination has to be maintained by a continual control voltage modulation. Consequently, the tether voltage available for the thrust is less than the maximum voltage provided by the power system. Using a spherical pendulum as a model for a single rotating tether, we derive analytical estimations for the control efficiency for two separate sail control modes. One is a continuous control modulation that corresponds to strictly planar tether tip motion. The other is an on-off modulation with the tether tip moving along a closed loop on a saddle surface. The novel on-off mode is introduce...

Toivanen, Petri; Envall, Jouni

2014-01-01T23:59:59.000Z

107

Diamond and Related Materials 8 (1999) 13881392 www.elsevier.com/locate/diamond  

E-Print Network [OSTI]

of the hot-filament diamond CVD gas-phase environment: direct comparison with experimental measurements R diamond reactor. These simulations have been compared to data measured using an in-situ molecular beam atoms, was found to be very important since it controlled the whole gas-phase chemistry. Comparison

Bristol, University of

108

Plasma spraying method for forming diamond and diamond-like coatings  

DOE Patents [OSTI]

A method and composition is disclosed for the deposition of a thick layer of diamond or diamond-like material. The method includes high temperature processing wherein a selected composition 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. The softened or molten composition crystallizes on the substrate to form a thick deposition layer comprising at least a diamond or diamond-like material. The selected composition includes at least glassy carbon as a primary constituent and may include at least one secondary constituent. Preferably, the secondary constituents are selected from the group consisting of at least diamond powder, boron carbide (B{sub 4}C) powder and mixtures thereof. 9 figs.

Holcombe, C.E.; Seals, R.D.; Price, R.E.

1997-06-03T23:59:59.000Z

109

Plasma spraying method for forming diamond and diamond-like coatings  

DOE Patents [OSTI]

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.

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

1997-01-01T23:59:59.000Z

110

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

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

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

111

n-Type diamond and method for producing same  

DOE Patents [OSTI]

A new n-type semiconducting diamond is disclosed, which is doped with n-type dopant atoms. Such diamond is advantageously formed by chemical vapor deposition from a source gas mixture comprising a carbon source compound for the diamond, and a volatile hot wire filament for the n-type impurity species, so that the n-type impurity atoms are doped in the diamond during its formation. A corresponding chemical vapor deposition method of forming the n-type semiconducting diamond is disclosed. The n-type semiconducting diamond of the invention may be usefully employed in the formation of diamond-based transistor devices comprising pn diamond junctions, and in other microelectronic device applications.

Anderson, Richard J. (Oakland, CA)

2002-01-01T23:59:59.000Z

112

Sparkling Diamonds – Reducing High Energy in the Frozen North  

E-Print Network [OSTI]

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...

Feldman, J.

2007-01-01T23:59:59.000Z

113

Study of Electron Transport and Amplification in Diamond  

SciTech Connect (OSTI)

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.

Muller, Erik M.; Ben-Zvi, Ilan

2013-03-31T23:59:59.000Z

114

Comparative evaluation of CVD diamond technologies  

SciTech Connect (OSTI)

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.

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

1993-01-01T23:59:59.000Z

115

Etching of polycrystalline diamond films by electron beam assisted plasma  

E-Print Network [OSTI]

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

Rocca, Jorge J.

116

Physica B 308310 (2001) 612615 Irradiation effects in semiconducting diamonds  

E-Print Network [OSTI]

Physica B 308­310 (2001) 612­615 Irradiation effects in semiconducting diamonds N. Kristianpoller irradiation on semiconducting diamonds (type IIb) were studied and compared with those induced at the same conditions in natural (type Ia) and in synthetic diamonds. Methods of optical absorption, of X-ray and light

Chen, Reuven

117

Thrust faulting in Temblor Range, Kern County, California  

SciTech Connect (OSTI)

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

Simonson, R.R.

1991-02-01T23:59:59.000Z

118

Center for Inverse Design: Research Thrusts and Subtasks  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc DocumentationP-Series to someone6Energy,MUSEUMCongratulations to CENResearch Thrusts and

119

White Bear Lake Conservation District (Minnesota)  

Broader source: Energy.gov [DOE]

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

120

Independent Oversight Review, Sodium Bearing Waste Treatment...  

Energy Savers [EERE]

Federal - June 2012 Independent Oversight Review, Sodium Bearing Waste Treatment Project - Federal - June 2012 June 2012 Review of the Sodium Bearing Waste Treatment Project -...

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


121

Independent Oversight Review, Sodium Bearing Waste Treatment...  

Energy Savers [EERE]

Contractor - June 2012 Independent Oversight Review, Sodium Bearing Waste Treatment Project - Contractor - June 2012 June 2012 Review of the Sodium Bearing Waste Treatment Project...

122

Wear of diamond and diamondlike carbon films.  

SciTech Connect (OSTI)

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.

Erdemir, A.; Energy Technology

2002-01-01T23:59:59.000Z

123

Accepted to Diamond and Related Materials A kinetic model of diamond nucleation and silicon carbide interlayer formation during  

E-Print Network [OSTI]

Accepted to Diamond and Related Materials A kinetic model of diamond nucleation and silicon carbide Engineering, Colorado State University, Fort Collins, CO, USA Abstract The presence of thin silicon carbide diffusion of carbon atoms into the silicon carbide layer, and the morphology and orientation of the diamond

Dandy, David

124

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

E-Print Network [OSTI]

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

Melnik, Roderick

125

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

SciTech Connect (OSTI)

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

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

2011-08-15T23:59:59.000Z

126

Mixed-mu superconducting bearings  

DOE Patents [OSTI]

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

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

1998-01-01T23:59:59.000Z

127

Mixed-mu superconducting bearings  

DOE Patents [OSTI]

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

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

1998-03-03T23:59:59.000Z

128

Method of improving field emission characteristics of diamond thin films  

DOE Patents [OSTI]

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.

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

1999-01-01T23:59:59.000Z

129

Method of improving field emission characteristics of diamond thin films  

DOE Patents [OSTI]

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.

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

1999-05-11T23:59:59.000Z

130

Testing and Lubrication for Single Race Bearings  

SciTech Connect (OSTI)

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

Steinhoff, R.G.

1998-03-04T23:59:59.000Z

131

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

E-Print Network [OSTI]

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

Hacker, Bradley R.

132

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

E-Print Network [OSTI]

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

133

Diamond and diamond-like carbon films for advanced electronic applications  

SciTech Connect (OSTI)

Aim of this laboratory-directed research and development (LDRD) project was to develop diamond and/or diamond-like carbon (DLC) films for electronic applications. Quality of diamond and DLC films grown by chemical vapor deposition (CVD) is not adequate for electronic applications. Nucleation of diamond grains during growth typically results in coarse films that must be very thick in order to be physically continuous. DLC films grown by CVD are heavily hydrogenated and are stable to temperatures {le} 400{degrees}C. However, diamond and DLC`s exceptional electronic properties make them candidates for integration into a variety of microelectronic structures. This work studied new techniques for the growth of both materials. Template layers have been developed for the growth of CVD diamond films resulting in a significantly higher nucleation density on unscratched or unprepared Si surfaces. Hydrogen-free DLC with temperature stability {le} 800{degrees}C has been developed using energetic growth methods such as high-energy pulsed-laser deposition. Applications with the largest system impact include electron-emitting materials for flat-panel displays, dielectrics for interconnects, diffusion barriers, encapsulants, and nonvolatile memories, and tribological coatings that reduce wear and friction in integrated micro-electro-mechanical devices.

Siegal, M.P.; Friedmann, T.A.; Sullivan, J.P. [and others

1996-03-01T23:59:59.000Z

134

Ultrasensitive Magnetometry and Imaging with NV Diamond  

E-Print Network [OSTI]

-size wire structure to sit directly on the surface of millimeter-scale diamond plate. In contrast to conventional magnetic resonance imaging pulsed ESR was used to measure the Rabi oscillations. From the beating of Rabi oscillations from a "double NV...

Kim, Changdong

2011-08-08T23:59:59.000Z

135

Hydrostatic bearings for a turbine fluid flow metering device  

DOE Patents [OSTI]

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

Fincke, J.R.

1982-05-04T23:59:59.000Z

136

Hydrostatic bearings for a turbine fluid flow metering device  

DOE Patents [OSTI]

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

Fincke, James R. (Rigby, ID)

1982-01-01T23:59:59.000Z

137

Data Archive and Portal Thrust Area Strategy Report  

SciTech Connect (OSTI)

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

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

2014-09-30T23:59:59.000Z

138

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

E-Print Network [OSTI]

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

Steen, Sean Kristian

2012-02-14T23:59:59.000Z

139

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

E-Print Network [OSTI]

Thermal Effects on Inverted Pendulum Thrust Stands for Steady-state High-power Plasma Thrusters A and Aerospace Engineering Department Princeton University, Princeton, New Jersey 08544 AIAA-2003-4842§ July 22, 2003 Abstract Thermal effects on direct measurements of the thrust produced by steady-state, high-power

Choueiri, Edgar

140

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

SciTech Connect (OSTI)

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.

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

1993-01-01T23:59:59.000Z

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


141

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]

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

Tzeng, Yonhua

142

Method to fabricate micro and nano diamond devices  

DOE Patents [OSTI]

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.

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

2014-10-07T23:59:59.000Z

143

Effectiveness of guidelines for retiming signalized diamond interchanges  

E-Print Network [OSTI]

OF SCIENCE May 1991 Major Subject: Civil Engineering EFFECTIVENESS OF GUIDELINES FOR RETIMING SIGNALIZED DIAMOND INTERCHANGES A Thesis by YVONNE DENISE IRVINE Approved as to style and content by: Daniel B. Fambro (Chair of Committee) Thomas Urbanik.... For the diamond interchange test, the participants were randomly assigned to two groups: the control group with no guidelines as reference or the second group, with the guidelines. The average scores on the diamond interchange test were compared using analysis...

Irvine, Yvonne Denise

1991-01-01T23:59:59.000Z

144

Measurement of tool forces in diamond turning  

SciTech Connect (OSTI)

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.

Drescher, J.; Dow, T.A.

1988-12-01T23:59:59.000Z

145

Precision diamond grinding of ceramics and glass  

SciTech Connect (OSTI)

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.

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

1988-12-01T23:59:59.000Z

146

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...

147

Electroless nickel: an important coating for diamond turning applications  

SciTech Connect (OSTI)

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.

Dini, J.W.

1980-09-24T23:59:59.000Z

148

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...

149

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...

150

Synthesis and characterization of a nanocrystalline diamond aerogel  

E-Print Network [OSTI]

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

Pauzauskie, Peter J.

2012-01-01T23:59:59.000Z

151

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

E-Print Network [OSTI]

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

Sengun, Mehmet Haluk

152

Yield Optimization of Nitrogen Vacancy Centers in Diamond  

E-Print Network [OSTI]

Atomic Force Microscopy APD Avalanche Photodiode CCD Charge Coupled Device CVD Chemical Vapor Deposition DC Direct Current ESR... CHAPTER I INTRODUCTION ................................................................................ …. .1 II THEORY .................................................................................................... .3 A. Diamond...

Chen, Jeson

2012-10-19T23:59:59.000Z

153

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,...

154

Diamonds are an Electronic Device's Best Friend | Department...  

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

way to combine diamond films with two other materials important for advanced devices, graphene and gallium nitride. Graphene is a rising star of the materials science world, with...

155

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...

156

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...

157

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

SciTech Connect (OSTI)

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.

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

158

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

DOE Patents [OSTI]

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.

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

159

Rubber bearings for precision positioning systems  

E-Print Network [OSTI]

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

Barton Martinelli, Augusto E

2005-01-01T23:59:59.000Z

160

Design of a low cost hydrostatic bearing  

E-Print Network [OSTI]

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

Wong, Anthony Raymond

2012-01-01T23:59:59.000Z

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


161

Self-bearing motor design & control  

E-Print Network [OSTI]

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

Imani Nejad, Mohammad

2013-01-01T23:59:59.000Z

162

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

E-Print Network [OSTI]

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

McCaskey, Michael Donald

1982-01-01T23:59:59.000Z

163

Investigation of the axial and radial thrusts in a centrifugal pump  

E-Print Network [OSTI]

Major Subject: Mechanical Engineering INVESTIGATION QF THE AXIAL AND RADIAL THRUSTS IN A CENTRIFUGAL PUMP A Thesis by CHQNG HWAN PARK Approved as to style and content by: eter Jenkins (C 'rman of Committee) Dr Srrra un aram (Member) Dr. R. R... of absolute flow velocity at outlet of impeller (ft/sec) Fa Fb diameter (in) axial thrust (lb) force acting on the back-faces of impeller (lb) Fr Hd H Hs Ht kx kx Pd P(r) force acting on the frontal face of impeller (lb) radial thrust (lb...

Park, Chong Hwan

1984-01-01T23:59:59.000Z

164

SMOKEY THE BEAR SUTRA Gary Snyder  

E-Print Network [OSTI]

is threatened by advertising, air pollution, televi­ sion, or the police, they should chant SMOKEY THE BEAR

Alexander, Roger K.

165

THE UNIVERSITY OF EDINBURGH. Hudson Beare Building.  

E-Print Network [OSTI]

. Accessible and standard toilets are also available. Introduction. The Hudson Beare Building housesTHE UNIVERSITY OF EDINBURGH. Hudson Beare Building. (King's Buildings). A GUIDE TO ACCESS AND FACILITIES. Address: Hudson Beare Building, King's Buildings, Edinburgh, E,H,9 3,J,F. Telephone number: 0131

Edinburgh, University of

166

NEW HIGH STRENGTH AND FASTER DRILLING TSP DIAMOND CUTTERS  

SciTech Connect (OSTI)

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.

Robert Radtke

2006-01-31T23:59:59.000Z

167

Electrically conductive polycrystalline diamond and particulate metal based electrodes  

DOE Patents [OSTI]

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.

Swain, Greg M.; Wang, Jian

2005-04-26T23:59:59.000Z

168

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

E-Print Network [OSTI]

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

ten Brink, Uri S.

169

E-Print Network 3.0 - active basement-involved thrust Sample...  

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

today (Hodges et al., 2001). Nevertheless, when... for the Main Central thrust in Nepal D.M. Robinson* P.G. DeCelles ... Source: Garzione, Carmala N. - Department of Earth...

170

Valve assembly having remotely replaceable bearings  

DOE Patents [OSTI]

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

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

1980-01-01T23:59:59.000Z

171

Method and apparatus for diamond wire cutting of metal structures  

DOE Patents [OSTI]

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.

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

2005-04-19T23:59:59.000Z

172

Secondary-electron emission from hydrogen-terminated diamond  

SciTech Connect (OSTI)

Diamond amplifiers demonstrably are an electron source with the potential to support high-brightness, high-average-current emission into a vacuum. We recently developed a reliable hydrogenation procedure for the diamond amplifier. The systematic study of hydrogenation resulted in the reproducible fabrication of high gain diamond amplifier. Furthermore, we measured the emission probability of diamond amplifier as a function of the external field and modelled the process with resulting changes in the vacuum level due to the Schottky effect. We demonstrated that the decrease in the secondary electrons average emission gain was a function of the pulse width and related this to the trapping of electrons by the effective NEA surface. The findings from the model agree well with our experimental measurements. As an application of the model, the energy spread of secondary electrons inside the diamond was estimated from the measured emission.

Wang E.; Ben-Zvi, I.; Rao, T.; Wu, Q.; Dimitrov, D.A.; T. Xin, T.

2012-05-20T23:59:59.000Z

173

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

E-Print Network [OSTI]

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

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

1985-02-01T23:59:59.000Z

174

Hydrostatic bearings for a turbine fluid flow metering device  

DOE Patents [OSTI]

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

Fincke, J.R.

1980-05-02T23:59:59.000Z

175

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 on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address: 160Benin: Energy ResourcesJersey:form ViewBlack Diamond Power Co Jump to: navigation,

176

Diamond Based TE Materials | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeat Pump Models |Conduct, Parent CompanyaUSAMPRelated Path DependenceDiamond Based TE

177

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarlyEnergyDepartment ofDepartment ofofOxford SiteToledoSampling atSFO |Alternate|BenefitsDiamond |

178

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

E-Print Network [OSTI]

, 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

Jacobsen, Steven D.

179

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

E-Print Network [OSTI]

: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

Kolodzey, James

180

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

E-Print Network [OSTI]

-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

Loncar, Marko

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


181

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

182

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

E-Print Network [OSTI]

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

Cartigny, Pierre

183

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

E-Print Network [OSTI]

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

Kolodzey, James

184

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

E-Print Network [OSTI]

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

Lee, Jong Duk

185

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

E-Print Network [OSTI]

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

Bristol, University of

186

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

E-Print Network [OSTI]

: 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

Walker, D. Greg

187

Atomistic simulations of structures and mechanical properties of S011diamond  

E-Print Network [OSTI]

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

Brenner, Donald W.

188

Nano-diamonds in the Universe A.C. Andersen,1  

E-Print Network [OSTI]

Nano-diamonds in the Universe A.C. Andersen,1 H. Mutschke,2 L. Binette3 , S. Höfner4 1 NORDITA, SE-75120 Uppsala Sweden The first direct evidence for nano-diamonds in space came from meteorites. Laboratory analyses on fine-grained diamond residues from primitive meteorites have shown that nano- diamonds

Andersen, Anja C.

189

Coupling of nitrogen-vacancy centers in diamond to a GaP waveguide  

E-Print Network [OSTI]

The optical coupling of guided modes in a GaP waveguide to nitrogen-vacancy (NV) centers in diamond is demonstrated. The electric field penetration into diamond and the loss of the guided mode are measured. The results indicate that the GaP-diamond system could be useful for realizing coupled microcavity-NV devices for quantum information processing in diamond.

K. -M. C. Fu; C. Santori; P. E. Barclay; I. Aharonovich; S. Prawer; N. Meyer; A. M. Holm; R. G. Beausoleil

2008-11-03T23:59:59.000Z

190

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

E-Print Network [OSTI]

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

Hilley, George

191

Turbocharger bearing retention and lubrication system  

SciTech Connect (OSTI)

This patent describes exhausts gas driven turbocharger. It comprises a housing, a shaft within the housing having a longitudinal axis of rotation and a pair of ends, a compressor wheel mounted within the housing on one end of the shaft for rotation therewith, a turbine wheel mounted within the housing on the other end of the shaft for rotation therewith, means for communicating air to the compressor wheel, means for communicating exhaust gas to the turbine wheel to cause the latter to rotate the shaft and the compressor wheel mounted thereon to compress the air communicated to the compressor wheel, and bearing means mounting the shaft for rotation relative to the housing, the bearing means including a bearing outer ring, a bearing inner ring, and ball bearing elements supporting the bearing outer ring on the bearing inner ring, a bearing locating aperture in the bearing outer ring, and an elongated bearing location pin having a longitudinal axis of symmetry extending transversely to the longitudinal axis of the shaft.

Gutknecht, D.A.

1991-12-31T23:59:59.000Z

192

Performance evaluation of bound diamond ring tools  

SciTech Connect (OSTI)

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.

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

1995-07-14T23:59:59.000Z

193

Diamond Magnetometry of Superconducting Thin Films  

E-Print Network [OSTI]

In recent years diamond magnetometers based on the nitrogen-vacancy (NV) center have been of considerable interest for magnetometry applications at the nanoscale. An interesting application which is well suited for NV centers is the study of nanoscale magnetic phenomena in superconducting materials. We employ the magnetic sensitivity of NV centers in diamond to interrogate the magnetic properties of a thin-layer yttrium barium copper oxide (YBCO) superconductor. Using fluorescence-microscopy methods and samples integrated with an NV sensor on a microchip, we measure the temperature of phase transition in the layer to be 70.0(2) K, and the penetration field of vortices to be 46(4) G. We observe the pinning of the vortices in the layer at 65 K, and estimate their density after cooling the sample in a ~ 10 G field to be 0.45(1) \\mu m^{-2}. These measurements are done with a 10 nm thick NV layer, so that high spatial resolution may be enabled in the future. Based on these results, we anticipate that this magnetometer could be useful for imaging the structure and dynamics of vortices. As an outlook, we present a fabrication method for a superconductor chip designed for this purpose.

A. Waxman; H. Schlussel; D. Groswasser; V. M. Acosta; L. -S. Bouchard; D. Budker; R. Folman

2014-02-05T23:59:59.000Z

194

Implantation conditions for diamond nanocrystal formation in amorphous silica  

SciTech Connect (OSTI)

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.

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

195

Printable, flexible and stretchable diamond for thermal management  

DOE Patents [OSTI]

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.

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

2013-06-25T23:59:59.000Z

196

Software optimization for electrical conductivity imaging in polycrystalline diamond cutters  

SciTech Connect (OSTI)

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.

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

197

Observation of diamond turned OFHC copper using Scanning Tunneling Microscopy  

SciTech Connect (OSTI)

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.

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

1988-12-01T23:59:59.000Z

198

Static forces in a superconducting magnet bearing  

SciTech Connect (OSTI)

Static levitation forces and stiffnesses in a superconducting bearing consisting of concentric ring magnets and a superconducting YBaCuO ring are investigated. In the field-cooled mode a levitation force of 20 N has been achieved. The axial and radial stiffnesses have values of 15 N/mm and 10 N/mm, respectively. An arrangement with two bearings supporting a high speed shaft is now under development. A possible application of superconducting magnetic bearings is flywheels for energy storage.

Stoye, P.; Fuchs, G. [Institut fuer Festkoerper- und Werkstofforschung, Dresden (Germany)] [Institut fuer Festkoerper- und Werkstofforschung, Dresden (Germany); Gawalek, W.; Goernert, P. [Institut fuer Physikalische Hochtechnologie, Jena (Germany)] [Institut fuer Physikalische Hochtechnologie, Jena (Germany); Gladun, A. [Technische Univ., Dresden (Germany)] [Technische Univ., Dresden (Germany)

1995-11-01T23:59:59.000Z

199

Engineering Research and Development and Technology thrust area report FY92  

SciTech Connect (OSTI)

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

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

1993-03-01T23:59:59.000Z

200

Principal Investigator Department Title Thrust Area Dr. Gang Li Physics Current Sheet Structures in the Inner Heliosphere 1500  

E-Print Network [OSTI]

Principal Investigator Department Title Thrust Area Dr. Gang Li Physics Current Sheet. Zuejing Xing Accounting/Finance Why are IPOs Underpriced? The Role of Institutional Ownership 3000 Dr

Alabama in Huntsville, University of

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


201

Electrodeposited coatings for diamond turning applications  

SciTech Connect (OSTI)

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.

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

202

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]

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

Bristol, University of

203

Gearbox Reliability Collaborative Bearing Calibration  

SciTech Connect (OSTI)

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

van Dam, J.

2011-10-01T23:59:59.000Z

204

Diamond graphs and super-reflexivity William B. Johnson  

E-Print Network [OSTI]

Diamond graphs and super-reflexivity William B. Johnson and Gideon Schechtman Abstract The main results is that dimension reduction a-la Johnson­Lindenstrauss fails in any non super reflexive space

Johnson, William B.

205

Electrochemical hydrogen termination of boron-doped diamond  

SciTech Connect (OSTI)

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).

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

206

Spin properties of very shallow nitrogen vacancy defects in diamond  

E-Print Network [OSTI]

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 ...

Ofori-Okai, Benjamin Kwasi

207

Thin diamond films provide new material for micro-machines |...  

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

Thin diamond films provide new material for micro-machines By Jared Sagoff * July 31, 2014 Tweet EmailPrint ARGONNE, Ill. - Airbags, inkjet printers and video projectors may not...

208

Plasma-assisted conversion of solid hydrocarbon to diamond  

DOE Patents [OSTI]

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.

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

209

Large piezoresistive effect in surface conductive nanocrystalline diamond  

SciTech Connect (OSTI)

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.

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

210

Strategic level expert system design for diamond interchange control  

E-Print Network [OSTI]

The selection of control for a diamond interchange is based upon many factors, including the geometry of the interchange, the current traffic patterns, and expected traffic patterns. Each possible control plan for an interchange is more applicable...

Patrone, David Michael

1999-01-01T23:59:59.000Z

211

Analysis of the influence of tool dynamics in diamond turning  

SciTech Connect (OSTI)

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.

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

1988-12-01T23:59:59.000Z

212

Fluorinated diamond particles bonded in a filled fluorocarbon resin matrix  

DOE Patents [OSTI]

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.

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

1983-11-14T23:59:59.000Z

213

Fluorinated diamond particles bonded in a filled fluorocarbon resin matrix  

DOE Patents [OSTI]

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.

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

1985-01-01T23:59:59.000Z

214

Self-adjusting magnetic bearing systems  

DOE Patents [OSTI]

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

Post, R.F.

1998-07-21T23:59:59.000Z

215

Self-adjusting magnetic bearing systems  

DOE Patents [OSTI]

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

Post, Richard F. (Walnut Creek, CA)

1998-01-01T23:59:59.000Z

216

Diagnostic of fusion neutrons on JET tokamak using diamond detector  

SciTech Connect (OSTI)

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.

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

217

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

E-Print Network [OSTI]

; 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

Bristol, University of

218

E-Print Network 3.0 - actuator ball bearings Sample Search Results  

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

(BB) Fluid-Dynamic Bearing (FDB) Servo Techniques... spindle motor bearings depending on mechanical design, i.e., ball bearing and fluid-dynamic bearing... . Spindle Motor ......

219

Elasticity, strength, and toughness of single crystal silicon carbide, ultrananocrystalline diamond, and hydrogen-free tetrahedral amorphous  

E-Print Network [OSTI]

Elasticity, strength, and toughness of single crystal silicon carbide, ultrananocrystalline diamond carbide 3C-SiC , ultrananocrystalline diamond, and hydrogen-free tetrahedral amorphous carbon

Espinosa, Horacio D.

220

Early Weichselian palaeoenvironments reconstructed from a mega-scale thrust-fault complex, Kanin Peninsula, northwestern Russia  

E-Print Network [OSTI]

-scale thrust-fault complex, Kanin Peninsula, northwestern Russia EILIV LARSEN, KURT H. KJ�R, MARIA JENSEN, IGOR a mega-scale thrust-fault complex, Kanin Peninsula, northwestern Russia. Boreas, Vol. 35, pp. 00Á00. Oslo and sorted sediments is superbly exposed on the north coast of the Kanin Peninsula, northwestern Russia

Ingólfsson, �lafur

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


221

Analytical and experimental investigations of hybrid air foil bearings  

E-Print Network [OSTI]

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

Kumar, Manish

2009-05-15T23:59:59.000Z

222

Turbocharger with improved roller bearing shaft support  

SciTech Connect (OSTI)

This paper describes an exhaust gas driven turbocharger. It comprises: a housing, a shaft within the housing having a pair of ends, a compressor wheel mounted within the housing on one end of the shaft for rotation therewith, a turbine wheel mounted within the housing on the other end of the shaft for rotation therewith, means for communicating air through the compressor wheel, means for communicating exhaust gas through the turbine wheel to cause the latter to rotate the shaft and the compressor wheel mounted thereon to compress the air communicated through the compressor wheel, and bearing means mounting the shaft for rotation relative to the housing, the bearing means including a bearing outer ring, a bearing inner ring, and ball bearing elements supporting the bearing outer ring on the bearing inner ring, the ball bearing elements includes a first set of the elements and a second set of the elements spaced axially from the first set, the bearing outer ring being a rigid, uninterrupted member providing an uninterrupted structural link between the first and second sets to establish the axial spacing between the sets, a pair of axially spaced faying surfaces on the inner ring engaging corresponding faying surfaces on the shaft to support the inner ring on the shaft, the shaft defining a circumferentially extending surface between the faying surfaces on the inner ring cooperating with the shaft to define an air gap therebetween, one of the faying surfaces on the inner ring having a diameter greater than the diameter of the other of the faying surfaces on the inner ring.

Gutknecht, D.A.

1991-10-08T23:59:59.000Z

223

PATENTING AND LICENSING The major thrust of the Technology Transfer Office's activity is directed towards  

E-Print Network [OSTI]

PATENTING AND LICENSING The major thrust of the Technology Transfer Office's activity that he or she may have created an invention, to promptly report it to the Technology Transfer Office. 2. Patentability Determination After the invention is reported to the Technology Transfer Office

224

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

E-Print Network [OSTI]

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

225

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

E-Print Network [OSTI]

Thrust Area 2 Free-Piston Compressor for Portable Fluid-Powered Systems Dr. Eric J. Barth José AMH batteries). Utili hi h d it li ti Free Piston Compressor (FPC) vs. Electrical Batteries System Source Energy · Utilize a free piston engine configuration to compress air by extracting energy from combustion of propane

Barth, Eric J.

226

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

E-Print Network [OSTI]

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

Tullis, Stephen

227

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

E-Print Network [OSTI]

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

Avouac, Jean-Philippe

228

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

E-Print Network [OSTI]

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

Paris-Sud XI, Université de

229

Thrust belt architecture of the central and southern Western Foothills of Taiwan  

E-Print Network [OSTI]

is an inverted basin. Most of the faults of the Western Foothills started their activity before the deposition of the Cholan Fm (~3.5 Ma). There is not a strict forward-breaking thrust sequence in Taiwan. Out-of-sequence faulting may be due to localized erosion...

Rodriguez-Roa, Fernando Antonio

2009-05-15T23:59:59.000Z

230

Compressor ported shroud for foil bearing cooling  

DOE Patents [OSTI]

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

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

2011-08-02T23:59:59.000Z

231

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

Broader source: Energy.gov [DOE]

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

232

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

Broader source: Energy.gov [DOE]

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

233

Notes 04. Static load performance of plain journal bearings  

E-Print Network [OSTI]

The long and short bearing models. Pressure field and fluid film forces on short length journal bearings. Equilibrium condition, load capacity and the Sommerfeld number....

San Andres, Luis

2010-01-01T23:59:59.000Z

234

E-Print Network 3.0 - adherent cvd diamond Sample Search Results  

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

Search Sample search results for: adherent cvd diamond Page: << < 1 2 3 4 5 > >> 1 Thin Film Diamond by Chemical Vapour Deposition Methods M. N. R. Ashfold, P. W. May, and C. A....

235

Proceedings of the Seventh Applied Diamond Conference/Third Frontier Carbon  

E-Print Network [OSTI]

Proceedings of the Seventh Applied Diamond Conference/Third Frontier Carbon Technology Joint of the Seventh Applied Diamond Conference/Third Frontier Carbon Technology Joint Conference (ADC/FCT 2003) NASA

Tzeng, Yonhua

236

Progress in the Advanced Synthetic-Diamond Drill Bit Program  

SciTech Connect (OSTI)

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.

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

237

Carbon nanotube bearings in theory and practice  

E-Print Network [OSTI]

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

Cook, Eugene Hightower

2011-01-01T23:59:59.000Z

238

A carbon nanotube bearing and Stodola rotor  

E-Print Network [OSTI]

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

Cook, Eugene Hightower

2008-01-01T23:59:59.000Z

239

RUBBER BEARINGS FOR DOWN-HOLE PUMPS  

SciTech Connect (OSTI)

Synopsis of project activity: 1998--Awarded cost share grant from DOE. 1st Qtr 1999--Developed fail safe lubricating system. 2nd Qtr 1999--Performed first large scale test with nitrile based bearings. It failed due to material swelling. Failure was blamed on improper tolerance. 3rd Qtr 1999--Material tests were performed with autoclaves and exposure tests to Casa Diablo fluids. Testing of Viton materials began. Alternate bearing designs were developed to limit risk of improper tolerances. 4th Qtr 1999--Site testing indicated a chemical attack on the bearing material caused the test failure and not improper bearing tolerance. 1st Qtr 2000--The assistance of Brookhaven National Laboratory was obtained in evaluating the chemical attack. The National Laboratory also began more elaborate laboratory testing on bearing materials. 2nd Qtr 2000--Testing indicated Viton was an inappropriate material due to degradation in Casa Diablo fluid. Testing of EPDM began. 3rd Qtr 2001--EPDM bearings were installed for another large scale test. Bearings failed again due to swelling. Further testing indicated that larger then expected oil concentrations existed in lubricating water geothermal fluid causing bearing failure. 2002-2003--Searched for and tested several materials that would survive in hot salt and oil solutions. Kalrez{reg_sign}, Viton{reg_sign}ETP 500 and Viton{reg_sign}GF were identified as possible candidates. 2003-2005--Kalrez{reg_sign}has shown superior resistance to downhole conditions at Casa Diablo from among the various materials tested. Viton ETP-500 indicated a life expectancy of 13 years and because it is significantly less expensive then Kalrez{reg_sign}, it was selected as the bearing material for future testing. Unfortunately during the laboratory testing period Dupont Chemical chose to stop manufacturing this specific formulation and replaced it with Viton ETP 600S. The material is available with six different fillers; three based on zinc oxide and three based on silicon oxide. Samples of all six materials have been obtained and are being tested at the National Laboratory in Brookhaven, New York. This new material's properties as a bearing material and its ability to adhere to a bearings shell must be reviewed, but cost information deemed the material to be too expensive to be economical.

Bob Sullivan Mammoth Pacific, L.P.

2005-09-07T23:59:59.000Z

240

Notes 16. Analysis of tilting pad bearings  

E-Print Network [OSTI]

NOTES 16. STATIC AND DYNAMIC FORCED PERFORMANCE OF TILTING PAD BEARINGS: ANALYSIS INCLUDING PIVOT STIFFNESS Dr. Luis San Andr?s Mast-Childs Professor August 2010 SUMMARY Work in progress ? still a lot of be done Introduction.... ANALYSIS OF TILTING PAD BEARINGS ? Luis San Andr?s (2010) 2 ANALYSIS Rocker and spherical pivots in tilting pad allow nearly frictionless pad rotation. An ideal rocker TPB, shown in Fig. 3(a), allows the pad to roll without slipping around a cylindrical...

San Andres, Luis

2010-01-01T23:59:59.000Z

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


241

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

E-Print Network [OSTI]

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

Duffy, Thomas S.

242

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

E-Print Network [OSTI]

]. 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

Lee, Jong Duk

243

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

244

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

E-Print Network [OSTI]

. 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

Boyer, Edmond

245

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

E-Print Network [OSTI]

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

Adler, Joan

246

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

E-Print Network [OSTI]

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

Boolchand, Punit

247

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

E-Print Network [OSTI]

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

Bristol, University of

248

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

E-Print Network [OSTI]

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

Bristol, University of

249

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

E-Print Network [OSTI]

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

Adler, Joan

250

Transitions in morphology observed in nitrogenmethanehydrogen depositions of polycrystalline diamond films  

E-Print Network [OSTI]

% 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

Ayres, Virginia

251

Charge Collection in the MERIT Diamond Detectors Kirk T. McDonald  

E-Print Network [OSTI]

, 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

McDonald, Kirk

252

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

E-Print Network [OSTI]

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

Bristol, University of

253

Microcrystalline diamond micromechanical resonators with quality factor limited by thermoelastic damping  

E-Print Network [OSTI]

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

Lin, Liwei

254

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

255

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

E-Print Network [OSTI]

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

Bristol, University of

256

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

E-Print Network [OSTI]

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

Jacobsen, Steven D.

257

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

E-Print Network [OSTI]

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

Brenner, Donald W.

258

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

E-Print Network [OSTI]

/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

George, Steven M.

259

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

E-Print Network [OSTI]

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

Hohls, Frank

260

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

E-Print Network [OSTI]

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

Bristol, University of

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


261

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

E-Print Network [OSTI]

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

Bristol, University of

262

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 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

Paris-Sud XI, Université de

263

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

E-Print Network [OSTI]

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

Brenner, Donald W.

264

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

265

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

E-Print Network [OSTI]

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

Bristol, University of

266

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

E-Print Network [OSTI]

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

Bristol, University of

267

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

E-Print Network [OSTI]

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

Brookhaven National Laboratory

268

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

E-Print Network [OSTI]

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

Paris-Sud XI, Université de

269

Electrical characterisation of defects in polycrystalline B-doped diamond films  

E-Print Network [OSTI]

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

Bristol, University of

270

In Situ Tribo-Electrochemical Characterization of Diamond-Containing Materials  

E-Print Network [OSTI]

diamond carbon (sp^(3)) to amorphous carbon (sp^(2)) is confirmed by Raman spectroscopy in the diamond composite. The surface roughness of the diamond grits was found to be greatly reduced due to wear. A tribo-electrochemical method is developed to in situ...

Xiao, Huaping

2014-07-31T23:59:59.000Z

271

Capacitively coupled RF diamond-like-carbon reactor  

DOE Patents [OSTI]

A process of coating a non-conductive fiber with diamond-like carbon, including passing a non-conductive fiber between a pair of parallel metal grids within a reaction chamber, introducing a hydrocarbon gas into the reaction chamber, forming a plasma within the reaction chamber for a sufficient period of time whereby diamond-like carbon is formed upon the non-conductive fiber, is provided together with a reactor chamber for deposition of diamond-like carbon upon a non-conductive fiber, including a vacuum chamber, a cathode assembly including a pair of electrically isolated opposingly parallel metal grids spaced apart at a distance of less than about 1 centimeter, an anode, a means of introducing a hydrocarbon gas into said vacuum chamber, and a means of generating a plasma within said vacuum chamber.

Devlin, David James (Los Alamos, NM); Coates, Don Mayo (Santa Fe, NM); Archuleta, Thomas Arthur (Espanola, NM); Barbero, Robert Steven (Santa Cruz, NM)

2000-01-01T23:59:59.000Z

272

Diamond tool wear of electrodeposited nickel-phosphorus alloy  

SciTech Connect (OSTI)

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.

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

273

Synthesis and characterization of a nanocrystalline diamond aerogel  

SciTech Connect (OSTI)

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.

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

274

Diamond-Silicon Carbide Composite And Method For Preparation Thereof  

DOE Patents [OSTI]

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.

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

2005-09-06T23:59:59.000Z

275

Mapping the location and configuration of nitrogen in diamond nanoparticles.  

SciTech Connect (OSTI)

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.

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

2007-01-17T23:59:59.000Z

276

Subtractive 3D Printing of Optically Active Diamond Structures  

E-Print Network [OSTI]

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.

Martin, Aiden A; Aharonovich, Igor

2014-01-01T23:59:59.000Z

277

Photonic nano-structures on (111)-oriented diamond  

SciTech Connect (OSTI)

We demonstrate the fabrication of single-crystalline diamond nanopillars on a (111)-oriented chemical vapor deposited diamond substrate. This crystal orientation offers optimal coupling of nitrogen-vacancy (NV) center emission to the nanopillar mode and is thus advantageous over previous approaches. We characterize single native NV centers in these nanopillars and find one of the highest reported saturated fluorescence count rates in single crystalline diamond in excess of 10{sup 6} counts per second. We show that our nano-fabrication procedure conserves the preferential alignment as well as the spin coherence of the NVs in our structures. Our results will enable a new generation of highly sensitive probes for NV magnetometry and pave the way toward photonic crystals with optimal orientation of the NV center's emission dipole.

Neu, Elke; Appel, Patrick; Ganzhorn, Marc; Miguel-Sánchez, Javier; Maletinsky, Patrick, E-mail: patrick.maletinsky@unibas.ch [Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel (Switzerland); Lesik, Margarita; Jacques, Vincent [Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and Ecole Normale Supérieure de Cachan, F-91405 Orsay (France); Mille, Vianney; Tallaire, Alexandre; Achard, Jocelyn [Université Paris 13, Sorbonne Paris Cité, Laboratoire des Sciences des Procédés et des Matériaux (CNRS UPR 3407), F-93430 Villetaneuse (France)

2014-04-14T23:59:59.000Z

278

Diamond turning of Si and Ge single crystals  

SciTech Connect (OSTI)

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.

Blake, P.; Scattergood, R.O.

1988-12-01T23:59:59.000Z

279

Smooth diamond films as low friction, long wear surfaces  

DOE Patents [OSTI]

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.

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

280

Boron-doped superlattices and Bragg mirrors in diamond  

SciTech Connect (OSTI)

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.

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

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


281

Polycrystal diamond growth in a microwave plasma torch  

SciTech Connect (OSTI)

Diamond films of different structures were deposited on quartz, WC-Co, and molybdenum substrates in a microwave plasma torch discharge in an argon-hydrogen-methane gas mixture in a sealed chamber at pressures close to atmospheric by using the chemical vapor deposition technique. Images of diamond polycrystal films and separate crystals, as well as results of Raman spectroscopy, are presented. The spectra of optical plasma radiation recorded during film deposition demonstrate the presence of intense H{sub {alpha}} hydrogen and C{sub 2} radical bands known as Swan bands.

Sergeichev, K. F.; Lukina, N. A.; Bolshakov, A. P.; Ralchenko, V. G.; Arutyunyan, N. R.; Vlasov, I. I. [Russian Academy of Sciences, Prokhorov Institute of General Physics (Russian Federation)

2010-12-15T23:59:59.000Z

282

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

E-Print Network [OSTI]

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

Bristol, University of

283

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

E-Print Network [OSTI]

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

Duffy, Thomas S.

284

Laser-processed three dimensional graphitic electrodes for diamond radiation detectors  

SciTech Connect (OSTI)

We have used an original approach for diamond detectors where three dimensional buried graphitic electrodes are processed in the bulk of a diamond substrate via laser-induced graphitization. Prototype made of polycrystalline chemical vapor deposition diamond was fabricated using a nanosecond UV laser. Its charge collection efficiency was evaluated using ?-particles emitted by a 241-Americium source. An improved charge collection efficiency was measured proving that laser micro-machining of diamond is a valid option for the future fabrication of three dimensional diamond detectors.

Caylar, Beno?-carett; Pomorski, Michal; Bergonzo, Philippe [CEA-LIST, Diamond Sensors Laboratory, Gif-sur-Yvette F-91191 (France)] [CEA-LIST, Diamond Sensors Laboratory, Gif-sur-Yvette F-91191 (France)

2013-07-22T23:59:59.000Z

285

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

SciTech Connect (OSTI)

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

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

2010-01-08T23:59:59.000Z

286

White-etching matter in bearing steel Part 2: Distinguishing cause and eect in bearing steel  

E-Print Network [OSTI]

White-etching matter in bearing steel Part 2: Distinguishing cause and eect in bearing steel through a mechanism called "white-structure flaking", has triggered many studies of microstructural damage associated with "white-etching ar- eas" created during rolling contact fatigue, although whether

Cambridge, University of

287

Removable bearing arrangement for a wind turbine generator  

DOE Patents [OSTI]

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

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

2010-06-15T23:59:59.000Z

288

Method for changing removable bearing for a wind turbine generator  

DOE Patents [OSTI]

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

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

2008-04-22T23:59:59.000Z

289

The chemistry of halogens on diamond: effects on growth and electron emission  

SciTech Connect (OSTI)

Diamond growth using halogenated precursors was studied in several diamond growth reactors. In a conventionao plasma reactor, diamond growth using the following gas mixtures was studied: CF{sub 4}/H{sub 2}, CH{sub 4}/H{sub 2}, CH{sub 3}F/H{sub 2}, and CH{sub 3}CL/H{sub 2}. Both the diamond growth measurements demonstrated ineffective transport of halogen radicals to the diamond surface during the growth process. In order to transport radical halogen species to the diamond surface during growth, a flow-tube reactor was constructed which minimized gas phase reactions. Also, the flow-tube reactor enabled pulsed gs transport to the diamond surface by fast-acting valves. Molecular beam mass spectroscopy was used to find condition which resulted in atomic hydrogen and/or atomic fluorine transport to the growing diamond surface. Although such conditions were found, they required very low pressures (0.5 Torr and below); these low pressures produce radical fluxes which are too low to sustain a reasonable diamond growth rate. The sequential reactor at Stanford was modified to add a halogen-growth step to the conventinoal atomic hydrogen/atomic carbon diamond growth cycle. Since the atomic fluorine, hydrogen and carbon environments are independent in the sequential reactor, the effect of fluorine on diamond growth could be studied independently of gas phase reactions. Although the diamond growth rate was increased by the use of fluorine, the film quality was seen to deteriorate as well as the substrate surface. Moreover, materials incompatibilities with fluorine significantly limited the use of fluorine in this reactor. A diamond growth model incorporating both gas phase and surface reactions was developed for the halocarbon system concurrent with the film growth efforts. In this report, we review the results of the growth experiments, the modeling, and additional experiments done to understand fluorine with diamond surfaces.

Hsu, W.L.; Pan, L.S.; Brown, L.A. [Sandia National Labs., Livermore, CA (United States)] [and others

1997-02-01T23:59:59.000Z

290

Diamond Lattice Model of Semicrystalline Polyethylene in the Amorphous Region  

E-Print Network [OSTI]

Diamond Lattice Model of Semicrystalline Polyethylene in the Amorphous Region Zhong­Hui Duan Abstract The statistics of polyethylene chains in the amorphous region between two crystallites have been as models of the chain molecules in the amorphous region of semicrystalline polyethylene, both

Aluffi, Paolo

291

New route to the fabrication of nanocrystalline diamond films  

SciTech Connect (OSTI)

Nanocrystalline diamond (NCD) thin films offer applications in various fields, but the existing synthetic approaches are cumbersome and destructive. A major breakthrough has been achieved by our group in the direction of a non-destructive, scalable, and economic process of NCD thin-film fabrication. Here, we report a cheap precursor for the growth of nanocrystalline diamond in the form of paraffin wax. We show that NCD thin films can be fabricated on a copper support by using simple, commonplace paraffin wax under reaction conditions of Hot Filament Chemical Vapor Deposition (HFCVD). Surprisingly, even the presence of any catalyst or seeding that has been conventionally used in the state-of-the-art is not required. The structure of the obtained films was analyzed by scanning electron microscopy and transmission electron microscopy. Raman spectroscopy and electron energy-loss spectroscopy recorded at the carbon K-edge region confirm the presence of nanocrystalline diamond. The process is a significant step towards cost-effective and non-cumbersome fabrication of nanocrystalline diamond thin films for commercial production.

Varshney, Deepak, E-mail: deepvar20@gmail.com; Morell, Gerardo [Institute of Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico 00931, Puerto Rico (United States); Department of Physics, University of Puerto Rico, San Juan, PO Box 70377, Puerto Rico 00936, Puerto Rico (United States); Palomino, Javier; Resto, Oscar [Department of Physics, University of Puerto Rico, San Juan, PO Box 70377, Puerto Rico 00936, Puerto Rico (United States); Gil, Jennifer [Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00936, Puerto Rico (United States); Weiner, Brad R. [Institute of Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico 00931, Puerto Rico (United States); Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00936, Puerto Rico (United States)

2014-02-07T23:59:59.000Z

292

Quantum optics with nitrogen-vacancy centers in diamond  

E-Print Network [OSTI]

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.

Yiwen Chu; Mikhail D. Lukin

2015-04-22T23:59:59.000Z

293

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

E-Print Network [OSTI]

Mass movement-induced fold-and-thrust belt structures in unconsolidated sediments in Lake Lucerne-lying, unconsolidated sediment at the foot of subaqueous slopes. These deformation structures appear beneath wedges

Gilli, Adrian

294

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

E-Print Network [OSTI]

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

Oakley, Jason Glen

1992-01-01T23:59:59.000Z

295

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

E-Print Network [OSTI]

-dimensionalized numerical and analytical solutions of the one-dimensional model using identical parameters to solve Equation 3 when KH is homogeneous. . . . . . . . . . . , , , . . . . . . . . . . . , . . . . . . . . . . . , . , 36 12 Total pore pressure at the end... deposition) for the one-dimensional model. . 40 14 Total pore pressure at the end of Stage 3 (thrust loading) for the one- dimensional model. . 42 15 Decay of X with time beginning at the end of Stage 3 (thrust loading) for the one-dimensional model...

Smith, Richard Edwin

1992-01-01T23:59:59.000Z

296

Wear Analysis of Wind Turbine Gearbox Bearings  

SciTech Connect (OSTI)

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

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

2010-04-01T23:59:59.000Z

297

High Temperature, Permanent Magnet Biased Magnetic Bearings  

E-Print Network [OSTI]

performance, high speed and high temperature applications like space vehicles, jet engines and deep sea equipment. The bearing system had a target design to carry a load equal to 500 lb-f (2225N). Another objective was to design and build a test rig fixture...

Gandhi, Varun R.

2010-07-14T23:59:59.000Z

298

Experimental verification of bifurcation in fluid bearings  

E-Print Network [OSTI]

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

Deepak, James Christopher

1997-01-01T23:59:59.000Z

299

Turbine bearings and rotor dynamics workshop: proceedings  

SciTech Connect (OSTI)

An EPRI workshop to address turbine bearing reliability improvement and rotor dynamics was co-hosted by Detroit Edison in Dearborn, Michigan on September 8-10, 1982. The 136 attendees represented a broad spectrum of US utilities, equipment manufacturers, and consultants, as well as representatives from England, Japan, and Switzerland. These proceedings contain the text of the formal presentations as well as summaries of the working group sessions which were devoted to topics of particular interest to the workshop participants. Formal presentations were organized under the following general session titles: utility experience and advancements in turbine bearing and lubrication systems; recent advancements in turbine bearing and lubrication systems; utility experience and advancements in turbine-generator rotor dynamics; and recent advancements in turbine-generator rotor dynamics. In addition to the technical presentations, working group sessions were held on selected topics relevant to turbine bearing reliability improvement and rotor dynamics. These groups provided a forum for engineers to exchange ideas and information in a less formal environment. The discussions provided attendees with an opportunity to discuss key issues in more detail and address subjects not covered in the formal presentations. The subjects of these working groups were: rotor dynamic analysis and problem solving; vibration signature analysis and field balancing; oil contamination monitoring and control; and operation and maintenance practices. Individual papers have been entered individually into EDB and ERA.

Brown, R.G.; Quilliam, J.F. (eds.)

1985-06-01T23:59:59.000Z

300

Diamond Wire Saw for Precision Machining of Laser Target Components  

SciTech Connect (OSTI)

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.

Bono, M J; Bennett, D W

2005-08-08T23:59:59.000Z

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


301

CX-005128: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

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

302

CX-005184: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

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

303

A bulk-flow model of angled injection Lomakin bearings  

E-Print Network [OSTI]

A bulk-flow model for determination of the leakage and dynamic force characteristics of angled injection Lomakin bearings is presented. Zeroth- and first-order equations describe the equilibrium flow for a centered bearing and the perturbed flow...

Soulas, Thomas Antoine Theo

2001-01-01T23:59:59.000Z

304

Three dimensional thermohydrodynamic analysis of multi-lobed bearings  

E-Print Network [OSTI]

of bearing using variable viscosity model are derived and compared to isoviscous results-Thermohydrodynamic simulation of multi-lobed journal bearings is presented using more realistic three dimensional boundary conditions on the model....

Mulchandani, Rajesh R.

1997-01-01T23:59:59.000Z

305

Strain based preload measurement in drive axle pinion bearings  

E-Print Network [OSTI]

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

Thomas, Anthony H., 1981-

2005-01-01T23:59:59.000Z

306

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

E-Print Network [OSTI]

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

Rothenhöfer, Gerald S. (Gerald Sven)

2007-01-01T23:59:59.000Z

307

Fuel-optimal Earth-Mars trajectories using low-thrust exhaust-modulated plasma propulsion  

E-Print Network [OSTI]

relerence frames Lx', y', r'I are different for the Earth and Mars references. The substitutions for the second-order derivatives required in the 27 differential equations are given by 2 VIM ISI CCS M + RM RM RM (2. 64) V V sin AM + RM cosltlM ( RM.... Characteristics of the Plasma Propulsion. . Equations of Motion. III NECESSARY CONDITIONS OF OPTIMALITY?. . . 14 15 16 30 Optimal Control Theory. Necessary Conditions of a Fuel-Optimal Earth-Mars Trajectory with Low-Thrust Plasma Propulsion...

Nah, Ren Sang

2012-06-07T23:59:59.000Z

308

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

E-Print Network [OSTI]

the westernmost exposed thrusts in this area (Figs. 3 and 4). The Chukou fault terminates to the north at the Chuchi uunsverse fault, and to the south is inferred to merge, and transfer displacement with, the Lunhou fault (Lin, 1996) just east of the Nanliao... surveys were then conducted in early 1996 and 1997 across the island using both these new monuments and pre-existing ones. These surveys were conducted with survey-grade GPS receivers on 4 to 12 sites simultaneously, with an average site occupation time...

Hickman, John Bibb

2012-06-07T23:59:59.000Z

309

Recommendation 195: Mitigation of Contamination in Bear Creek Burial Grounds  

Broader source: Energy.gov [DOE]

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

310

Diamond neutral particle spectrometer for fusion reactor ITER  

SciTech Connect (OSTI)

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.

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

311

SHORT COMMUNICATION Behaviour of brown bears killing wild ungulates  

E-Print Network [OSTI]

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

Boyer, Edmond

312

Strategies for improving traffic operations at oversaturated signalized diamond interchanges  

E-Print Network [OSTI]

street improvement goals should include improved traffic flow along with reductions in congestion, air pollution, and energy use, without major new construction. Super-street arterials, which are multi-lane arterials with limited access and a limited...STRATEGIES FOR IMPROVING TRAFFIC OPERATIONS AT OVERSATURATED SIGNALIZED DIAMOND INTERCHANGES A Thesis by GEORGE CURTIS HERRICK Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements...

Herrick, George Curtis

1992-01-01T23:59:59.000Z

313

New Superhard Form of Carbon Dents Diamond | U.S. DOE Office...  

Office of Science (SC) Website

exists in many different structures, each having different properties (e.g. graphite, graphene, and diamond). This research demonstrated yet another structure that is superhard,...

314

E-Print Network 3.0 - advanced diamond product Sample Search...  

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

Summary: Demand for both gem and industrial diamonds is very strong. Synthetic production supplies industrial uses... , and will position Canada with Botswana and Russia as...

315

Perfect preferential orientation of nitrogen-vacancy defects in a synthetic diamond sample  

SciTech Connect (OSTI)

We show that the orientation of nitrogen-vacancy (NV) defects in diamond can be efficiently controlled through chemical vapor deposition growth on a (111)-oriented diamond substrate. More precisely, we demonstrate that spontaneously generated NV defects are oriented with a ?97% probability along the [111] axis, corresponding to the most appealing orientation among the four possible crystallographic axes. Such a nearly perfect preferential orientation is explained by analyzing the diamond growth mechanism on a (111)-oriented substrate and could be extended to other types of defects. This work is a significant step towards the design of optimized diamond samples for quantum information and sensing applications.

Lesik, M.; Roch, J.-F. [Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and Ecole Normale Supérieure de Cachan, 91405 Orsay (France); Tetienne, J.-P.; Jacques, V., E-mail: vjacques@ens-cachan.fr [Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and Ecole Normale Supérieure de Cachan, 91405 Orsay (France); Laboratoire de Photonique Quantique et Moléculaire, Ecole Normale Supérieure de Cachan and CNRS UMR 8537, 94235 Cachan (France); Tallaire, A., E-mail: alexandre.tallaire@lspm.cnrs.fr; Achard, J.; Mille, V.; Gicquel, A. [Laboratoire des Sciences des Procédés et des Matériaux, CNRS and Université Paris 13, 93340 Villetaneuse (France)

2014-03-17T23:59:59.000Z

316

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

SciTech Connect (OSTI)

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.

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

1981-01-01T23:59:59.000Z

317

Bear Canyon Geothermal Facility | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of InspectorConcentrating SolarElectricEnergyCTBarre Biomass Facility Jump to:SectorBear Canyon Geothermal

318

Bear Valley Electric Service | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of InspectorConcentrating SolarElectricEnergyCTBarre Biomass Facility Jump to:SectorBear Canyon

319

Dynamically stable magnetic suspension/bearing system  

DOE Patents [OSTI]

A magnetic bearing system contains magnetic subsystems which act together to support a rotating element in a state of dynamic equilibrium. However, owing to the limitations imposed by Earnshaw's Theorem, the magnetic bearing systems to be described do not possess a stable equilibrium at zero rotational speed. Therefore, mechanical stabilizers are provided, in each case, to hold the suspended system in equilibrium until its speed has exceeded a low critical speed where dynamic effects take over, permitting the achievement of a stable equilibrium for the rotating object. A state of stable equilibrium is achieved above a critical speed by use of a collection of passive elements using permanent magnets to provide their magnetomotive excitation. The magnetic forces exerted by these elements, when taken together, levitate the rotating object in equilibrium against external forces, such as the force of gravity or forces arising from accelerations. At the same time, this equilibrium is made stable against displacements of the rotating object from its equilibrium position by using combinations of elements that possess force derivatives of such magnitudes and signs that they can satisfy the conditions required for a rotating body to be stably supported by a magnetic bearing system over a finite range of those displacements.

Post, Richard F. (Walnut Creek, CA)

1996-01-01T23:59:59.000Z

320

Dynamically stable magnetic suspension/bearing system  

DOE Patents [OSTI]

A magnetic bearing system contains magnetic subsystems which act together to support a rotating element in a state of dynamic equilibrium. However, owing to the limitations imposed by Earnshaw`s Theorem, the magnetic bearing systems to be described do not possess a stable equilibrium at zero rotational speed. Therefore, mechanical stabilizers are provided, in each case, to hold the suspended system in equilibrium until its speed has exceeded a low critical speed where dynamic effects take over, permitting the achievement of a stable equilibrium for the rotating object. A state of stable equilibrium is achieved above a critical speed by use of a collection of passive elements using permanent magnets to provide their magnetomotive excitation. The magnetic forces exerted by these elements, when taken together, levitate the rotating object in equilibrium against external forces, such as the force of gravity or forces arising from accelerations. At the same time, this equilibrium is made stable against displacements of the rotating object from its equilibrium position by using combinations of elements that possess force derivatives of such magnitudes and signs that they can satisfy the conditions required for a rotating body to be stably supported by a magnetic bearing system over a finite range of those displacements. 32 figs.

Post, R.F.

1996-02-27T23:59:59.000Z

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


321

Gerotor and bearing system for whirling mass orbital vibrator  

DOE Patents [OSTI]

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

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

2007-02-27T23:59:59.000Z

322

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

E-Print Network [OSTI]

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

Bristol, University of

323

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

E-Print Network [OSTI]

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

Cartigny, Pierre

324

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

E-Print Network [OSTI]

. 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

Bristol, University of

325

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

E-Print Network [OSTI]

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

Loncar, Marko

326

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

E-Print Network [OSTI]

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

Walker, D. Greg

327

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

E-Print Network [OSTI]

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

Bristol, University of

328

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

E-Print Network [OSTI]

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

Lee, Jong Duk

329

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

330

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

E-Print Network [OSTI]

.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

Bristol, University of

331

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

E-Print Network [OSTI]

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

Bristol, University of

332

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

E-Print Network [OSTI]

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

Qin, Qinghua

333

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

E-Print Network [OSTI]

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

Hohls, Frank

334

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

E-Print Network [OSTI]

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

Massachusetts at Lowell, University of

335

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

E-Print Network [OSTI]

. 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

Bristol, University of

336

Method of bonding diamonds in a matrix and articles thus produced  

DOE Patents [OSTI]

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.

Taylor, G.W.

1981-01-27T23:59:59.000Z

337

A kinetic model of diamond nucleation and silicon carbide interlayer formation during chemical vapor deposition  

E-Print Network [OSTI]

A kinetic model of diamond nucleation and silicon carbide interlayer formation during chemical February 2005 Available online 7 April 2005 Abstract The presence of thin silicon carbide intermediate of carbon atoms into the silicon carbide layer and the morphology and orientation of the diamond film

Dandy, David

338

OSL RADIATION DOSIMETRY USING BORON DOPED CVD DIAMOND FILMS J. A. N. Gonalves1  

E-Print Network [OSTI]

de la Universidad de Sonora, Apdo. Postal 130, Hermosillo, Sonora, 83000 México The optically irradiated diamond filmsTL glow curves of beta irradiated diamond films de B/C de 4000de B/C de 4000 ppm beta irradiation and photostimulated with blue light.toa beta irradiation and photostimulated with blue

339

On the optimization of a dc arcjet diamond chemical vapor deposition reactor  

E-Print Network [OSTI]

On the optimization of a dc arcjet diamond chemical vapor deposition reactor S. W. Reevea) and W. A precursor in our dc arcjet reactor.1 Based on conclusions drawn from that work, an optimization strategy diamond film growth in a dc arcjet chemical vapor deposition reactor has been developed. Introducing

Dandy, David

340

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

E-Print Network [OSTI]

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

Pfeifer, Holger

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


341

Graphite-to-diamond transformation induced by ultrasound cavitation A.Kh. Khachatryan a,c  

E-Print Network [OSTI]

Graphite-to-diamond transformation induced by ultrasound cavitation A.Kh. Khachatryan a,c , S microcrystals have been synthesized using ultrasonic cavitation of a suspension of hexagonal graphite in various. © 2008 Elsevier B.V. All rights reserved. Keywords: Ultrasound cavitation; Microcrystalline diamond 1

Bristol, University of

342

A robust scanning diamond sensor for nanoscale imaging with single nitrogen-vacancy centres  

E-Print Network [OSTI]

A robust scanning diamond sensor for nanoscale imaging with single nitrogen-vacancy centres P and A. Yacoby1 * The nitrogen-vacancy defect centre in diamond1­4 has potential applications processing9 and bioimaging10 . These applications rely on the ability to pos- ition a single nitrogen-vacancy

Walsworth, Ronald L.

343

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

E-Print Network [OSTI]

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

Himpsel, Franz J.

344

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

E-Print Network [OSTI]

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

Dandy, David

345

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

SciTech Connect (OSTI)

{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.

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

346

Elastohydrodynamic behavior of compliant slider bearings  

E-Print Network [OSTI]

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

Herrington, Rodney Emerson

1973-01-01T23:59:59.000Z

347

Bear, Delaware: 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 on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address: 160 EastMaine:Barbers PointEnergy Information Hot Springs Pool & SpaBear,

348

Bear Creek Wind Farm | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of InspectorConcentrating SolarElectricEnergyCTBarre Biomass Facility Jump to:SectorBear Canyon GeothermalCreek

349

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

DOE Patents [OSTI]

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.

Rao, Triveni; Walsh, John; Gangone, Elizabeth

2014-12-30T23:59:59.000Z

350

Structure and superconductivity of isotope-enriched boron-doped diamond  

SciTech Connect (OSTI)

Superconducting boron-doped diamond samples were synthesized with isotopes of {sup 10}B, {sup 11}B, {sup 13}C and {sup 12}C. We claim the presence of a carbon isotope effect on the superconducting transition temperature, which supports the 'diamond-carbon'-related nature of superconductivity and the importance of the electron-phonon interaction as the mechanism of superconductivity in diamond. Isotope substitution permits us to relate almost all bands in the Raman spectra of heavily boron-doped diamond to the vibrations of carbon atoms. The 500 cm{sup 01} Raman band shifts with either carbon or boron isotope substitution and may be associated with vibrations of paired or clustered boron. The absence of a superconducting transition (down to 1.6 K) in diamonds synthesized in the Co-C-B system at 1900 K correlates with the small boron concentration deduced from lattice parameters.

Thompson, Joe D [Los Alamos National Laboratory; Ekimov, E A [INSTIT OF HIGH PRESSURE; Sidorov, V A [INSTIT OF HIGH PRESSURE; Zoteev, A [MOSCOW SU; Lebed, Y [INST FOR NUCI RES; Stishov, S M [INST FOR HIGH PRESSURE

2008-01-01T23:59:59.000Z

351

Enhancement of the nucleation of smooth and dense nanocrystalline diamond films by using molybdenum seed layers  

SciTech Connect (OSTI)

A method for the nucleation enhancement of nanocrystalline diamond (NCD) films on silicon substrates at low temperature is discussed. A sputter deposition of a Mo seed layer with thickness 50 nm on Si substrates was applied followed by an ultrasonic seeding step with nanosized detonation diamond powders. Hot-filament chemical vapor deposition (HF-CVD) was used to nucleate and grow NCD films on substrates heated up at 550 deg. C. The nucleation of diamond and the early stages of NCD film formation were investigated at different methane percentages in methane/hydrogen gas mixtures by atomic force microscopy, micro-Raman spectroscopy, scanning electron microscopy, and grazing incidence x-ray analyses in order to gain specific insight in the nucleation process of NCD films. The nucleation kinetics of diamond on the Mo-coated Si substrates was found to be up to ten times higher than on blank Si substrates. The enhancement of the nucleation of diamond on thin Mo interlayers results from two effects, namely, (a) the nanometer rough Mo surface shows an improved embedding of ultrasonically introduced nanosized diamond seeds that act as starting points for the diamond nucleation during HF-CVD and (b) the rapid carbonization of the Mo surface causes the formation of Mo{sub 2}C onto which diamond easily nucleates. The diamond nucleation density progressively increases at increasing methane percentages and is about 5x10{sup 10} cm{sup -2} at 4.0% methane. The improved nucleation kinetics of diamond on Mo interlayers facilitates the rapid formation of NCD films possessing a very low surface roughness down to {approx}6 nm, and allows a submicron thickness control.

Buijnsters, J. G. [Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 44, B-3001 Leuven (Belgium); Institute for Molecules and Materials, Radboud University Nijmegen, Heijendaalseweg 135, 6525 AJ Nijmegen (Netherlands); Vazquez, L. [Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Cantoblanco, C/Sor Juana Ines de la Cruz 3, 28049 Madrid (Spain); Dreumel, G. W. G. van; Meulen, J. J. ter; Enckevort, W. J. P. van [Institute for Molecules and Materials, Radboud University Nijmegen, Heijendaalseweg 135, 6525 AJ Nijmegen (Netherlands); Celis, J. P. [Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 44, B-3001 Leuven (Belgium)

2010-11-15T23:59:59.000Z

352

Nanoscale fluorescence lifetime imaging with a single diamond NV center  

E-Print Network [OSTI]

Solid-state quantum emitters, such as artificially engineered quantum dots or naturally occurring defects in solids, are being investigated for applications ranging from quantum information science and optoelectronics to biomedical imaging. Recently, these same systems have also been studied from the perspective of nanoscale metrology. In this letter we study the near-field optical properties of a diamond nanocrystal hosting a single nitrogen vacancy center. We find that the nitrogen vacancy center is a sensitive probe of the surrounding electromagnetic mode structure. We exploit this sensitivity to demonstrate nanoscale fluorescence lifetime imaging microscopy (FLIM) with a single nitrogen vacancy center by imaging the local density of states of an optical antenna.

Ryan Beams; Dallas Smith; Timothy W. Johnson; Sang-Hyun Oh; Lukas Novotny; Nick Vamivakas

2013-03-05T23:59:59.000Z

353

The reflection of very cold neutrons from diamond powder nanoparticles  

E-Print Network [OSTI]

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.

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

2008-05-17T23:59:59.000Z

354

Method and apparatus for making diamond-like carbon films  

DOE Patents [OSTI]

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.

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

355

Refractory two-dimensional hole gas on hydrogenated diamond surface  

SciTech Connect (OSTI)

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.

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

356

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 on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address: 160Benin: Energy ResourcesJersey:form ViewBlack Diamond Power Co Jump to:

357

Positive contact, self retaining bearing seals  

DOE Patents [OSTI]

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

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

1992-05-05T23:59:59.000Z

358

Active thrust faulting offshore Boumerdes, Algeria, and its relations to the 2003 Mw 6.9 earthquake  

E-Print Network [OSTI]

Active thrust faulting offshore Boumerdes, Algeria, and its relations to the 2003 Mw 6.9 earthquake offshore Boumerdes, Algeria, and its relations to the 2003 Mw 6.9 earthquake, Geophys. Res. Lett., 32, L that strain is distributed over a broad area, from the Atlas front to the offshore margin [Buforn et al., 1995

Déverchère, Jacques

359

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

E-Print Network [OSTI]

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

Elliott, John

360

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

E-Print Network [OSTI]

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

Oren, Shmuel S.

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


361

Notes 03. Kinematics of motion in cylindrical journal bearings  

E-Print Network [OSTI]

Reynolds equation for cylindrical journal bearings. Kinematics of motion and film thickness. Distinction between fixed and rotating coordinates. The pure squeeze velocity vector. Examples of journal motion....

San Andres, Luis

2009-01-01T23:59:59.000Z

362

Passive magnetic bearing element with minimal power losses  

DOE Patents [OSTI]

Systems employing passive magnetic bearing elements having minimal power losses are provided. Improved stabilizing elements are shown, employing periodic magnet arrays and inductively loaded circuits, but with improved characteristics compared to the elements disclosed in US Patent No. 5,495,221 entitled ``Dynamically Stable Magnetic Suspension/Bearing System.`` The improvements relate to increasing the magnitude of the force derivative, while at the same time reducing the power dissipated during the normal operation of the bearing system, to provide a passive bearing system that has virtually no losses under equilibrium conditions, that is, when the supported system is not subject to any accelerations except those of gravity. 8 figs.

Post, R.F.

1998-12-08T23:59:59.000Z

363

Passive magnetic bearing element with minimal power losses  

DOE Patents [OSTI]

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

Post, Richard F. (Walnut Creek, CA)

1998-01-01T23:59:59.000Z

364

Investigations of Bearing Failures Associated with White Etching...  

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

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

365

Preliminary relative permeability estimates of methane hydrate-bearing sand  

E-Print Network [OSTI]

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

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

2006-01-01T23:59:59.000Z

366

Contestation of Place: Bear Butte and the Sturgis Motorcycle Rally.  

E-Print Network [OSTI]

??The sacred American Indian mountain of Bear Butte, South Dakota is a contested place under threat from the biker themed campgrounds that facilitate the Sturgis… (more)

Stasiuk, Davie D.

2012-01-01T23:59:59.000Z

367

Resonant frequency method for bearing ball inspection  

DOE Patents [OSTI]

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

Khuri-Yakub, B. T. (Palo Alto, CA); Hsieh, Chung-Kao (Stanford, CA)

1993-01-01T23:59:59.000Z

368

Resonant frequency method for bearing ball inspection  

DOE Patents [OSTI]

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

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

1993-11-02T23:59:59.000Z

369

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

E-Print Network [OSTI]

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 $T_2 > 2\\,ms$.

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

2012-06-19T23:59:59.000Z

370

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

SciTech Connect (OSTI)

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.

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

371

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

SciTech Connect (OSTI)

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.

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

372

Permanent magnet design for high-speed superconducting bearings  

DOE Patents [OSTI]

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

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

1996-09-10T23:59:59.000Z

373

Synoptic Observing Programs at Big Bear Solar Observatory  

E-Print Network [OSTI]

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

374

High temperature, permanent magnet biased, homopolar magnetic bearing actuator  

E-Print Network [OSTI]

current resistance and improves the system efficiency because the magnetic field of the HTPM can suspend the major portion of the static load on bearing. A high temperature radial magnetic bearing was designed via an iterative search employing 3D finite...

Hossain, Mohammad Ahsan

2006-10-30T23:59:59.000Z

375

Permanent magnet design for high-speed superconducting bearings  

DOE Patents [OSTI]

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

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

1996-01-01T23:59:59.000Z

376

Development of Designer Diamond Anvils for High Pressure-High-Temperature Experiments in Support of the Stockpile Stewardship Program  

SciTech Connect (OSTI)

The focus of this program at the University of Alabama at Birmingham (UAB) is to develop the next generation of designer diamond anvils that can perform simultaneous joule heating and temperature profile measurements in a diamond anvil cell. A series of tungsten-rhenium thermocouples will be fabricated onto to the anvil and encapsulated by a chemical vapor deposited diamond layer to allow for a complete temperature profile measurement across the anvil. The tip of the diamond anvil will be engineered to reduce the thermal conductivity so that the tungsten-heating coils can be deposited on top of this layer. Several different approaches will be investigated to engineer the tip of the diamond anvil for reduction in thermal conductivity (a) isotopic mixture of 12C and 13C in the diamond layer, (b) doping of diamond with impurities (nitrogen and/or boron), and (c) growing diamond in a higher concentration of methane in hydrogen plasma. Under this academic alliance with Lawrence Livermore National Laboratory (LLNL), PI and his graduate students will use the lithographic and diamond polishing facility at LLNL. This proposed next generation of designer diamond anvils will allow multi-tasking capability with the ability to measure electrical, magnetic, structural and thermal data on actinide materials with unparallel sensitivity in support of the stockpile stewardship program.

Yogesh K. Vohra

2005-05-12T23:59:59.000Z

377

HFCVD of diamond at low substrate and low filament temperatures  

SciTech Connect (OSTI)

It has been discovered that the addition of a small amount of oxygen to the CH{sub 4} and H{sub 2} feed gas permits HFCVD of diamond at significantly lower filament and substrate temperatures. The effective O/C ratio here is much lower than that used in most studies of the oxygen effect. Careful control of the O/C and C/H ratios were found to be crucial to success. The effects of substrate and filament temperatures on growth rate and film quality were studied. Optimum conditions were found that gave reasonable growth rates ( {approximately}0.5 {mu}m/h ) with high film quality at filament temperatures below 1750{degrees}C and substrate temperatures below 600C. As a result, low temperature deposition has been realized. Power consumption can be reduced 50%, and the filament lifetime is extended indefinitely.

Tolt, Z.L.; Heatherly, L.; Clausing, R.E.; Shaw, R.W. [Oak Ridge National Lab., TN (United States); Feigerle, C.S. [Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry

1995-12-31T23:59:59.000Z

378

The Discrete Geometry of a Small Causal Diamond  

E-Print Network [OSTI]

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.

Mriganko Roy; Debdeep Sinha; Sumati Surya

2012-12-04T23:59:59.000Z

379

Study of narrowband single photon emitters in polycrystalline diamond films  

SciTech Connect (OSTI)

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.

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

380

Methane Recovery from Hydrate-bearing Sediments  

SciTech Connect (OSTI)

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

J. Carlos Santamarina; Costas Tsouris

2011-04-30T23:59:59.000Z

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


381

Evaluation of traffic operations at diamond interchanges using advanced actuated control  

E-Print Network [OSTI]

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...

Koonce, Peter John Vincent

1998-01-01T23:59:59.000Z

382

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

E-Print Network [OSTI]

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 ...

Li, Luozhou

383

Examination of the Material Removal Rate in Lapping Polycrystalline Diamond Compacts  

E-Print Network [OSTI]

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...

Sowers, Jason Michael

2012-10-19T23:59:59.000Z

384

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

E-Print Network [OSTI]

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...

Krueger, Gregory David

1995-01-01T23:59:59.000Z

385

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...

386

The effects of diamond injector angles on flow structures at various Mach numbers  

E-Print Network [OSTI]

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...

McLellan, Justin Walter

2006-10-30T23:59:59.000Z

387

Sodium Bearing Waste Processing Alternatives Analysis  

SciTech Connect (OSTI)

A multidisciplinary team gathered to develop a BBWI recommendation to DOE-ID on the processing alternatives for the sodium bearing waste in the INTEC Tank Farm. Numerous alternatives were analyzed using a rigorous, systematic approach. The data gathered were evaluated through internal and external peer reviews for consistency and validity. Three alternatives were identified to be top performers: Risk-based Calcination, MACT to WIPP Calcination and Cesium Ion Exchange. A dual-path through early Conceptual design is recommended for MACT to WIPP Calcination and Cesium Ion Exchange since Risk-based Calcination does not require design. If calcination alternatives are not considered based on giving Type of Processing criteria significantly greater weight, the CsIX/TRUEX alternative follows CsIX in ranking. However, since CsIX/TRUEX shares common uncertainties with CsIX, reasonable backups, which follow in ranking, are the TRUEX and UNEX alternatives. Key uncertainties must be evaluated by the decision-makers to choose one final alternative. Those key uncertainties and a path forward for the technology roadmapping of these alternatives is provided.

Murphy, James Anthony; Palmer, Brent J; Perry, Keith Joseph

2003-12-01T23:59:59.000Z

388

Development of Single Crystal Chemical Vapor Deposition Diamonds for Detector Applications  

SciTech Connect (OSTI)

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).

Kagan, Harris; Kass, Richard; Gan, K.K.

2014-01-23T23:59:59.000Z

389

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]

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

Paris-Sud XI, Université de

2008-01-01T23:59:59.000Z

390

Sequence stratigraphy, paleoclimate, and tectonics of coal-bearing strata  

SciTech Connect (OSTI)

The origin of coal-bearing strata has been debated vigorously for more than a century, and with the emergence of coalbed methane as a major energy resource and the possibility of sequestering greenhouse gas in coal, this debate has never been more relevant. This volume contains 10 chapters on coal-bearing strata of Carboniferous through Tertiary age and is based on a special session that was held at an AAPG Annual Meeting in New Orleans. Contributors have employed a multitude of approaches ranging from basin analysis to plant taphonomy to support a variety of views on the sequence stratigraphy, paleoclimate, and tectonics of coal-bearing strata.

Jack C. Pashin; Robert A. Gastaldo (eds.)

2004-07-15T23:59:59.000Z

391

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

E-Print Network [OSTI]

stratigraphy typical ol North American thrust belts (Figure 3) where the horizontal permeability of Layer 3 is ten times the vertical permeability. 49 23 a) Total pore pressure, b) excess pore pressure, c) ). , and d) temperature, for a stratigraphy... typical of North American thrust belts (Figure 3) where the horizontal pcrmcahility of Layer 3 is one-hundred times the vertical permeability. 50 24 a) Total pore pressure, b) excess porc prcssure, c) X, and d) tcmpcraturc, for "standard" model...

Sales, James Gregory

1994-01-01T23:59:59.000Z

392

E-Print Network 3.0 - active polyoxotungstates bearing Sample...  

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

Fundamentals Summary: Syllabus of 2002 Geotechnical Engineering Fundamentals (GeoEngineering Fundamentals) 1 Bearing... .3 Rankine Solution 1.4 Terzaghi General Bearing...

393

E-Print Network 3.0 - alternate bearing indices Sample Search...  

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

Summary: .124313506501JET477 Abstract: Offset' journal bearings provide an alternate design approach for problematic... suggests that offset bearings might provide a good...

394

Circular sensor array and nonlinear analysis of homopolar magnetic bearings  

E-Print Network [OSTI]

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

Wiesenborn, Robert Kyle

2007-04-25T23:59:59.000Z

395

Hydrogen trapping in bearing steels: mechanisms and alloy design  

E-Print Network [OSTI]

Hydrogen embrittlement is a problem that offers challenges both to technology and to the theory of metallurgy. In the presence of a hydrogen rich environment, applications such as rolling bearings display a significant decrease in alloy strength...

Szost, Blanka Angelika

2013-02-05T23:59:59.000Z

396

Field Examples of Axial Cracked Bearings in Wind Turbine Gearboxes...  

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

Field Examples of Axial Cracked Bearings in Wind Turbine Gearboxes Presented by Paul John Baker of FrontierPro Services at the Wind Turbine Tribology Seminar 2014. 141030 Axial...

397

Force measurements in magnetic bearings using fiber optic strain gauges  

E-Print Network [OSTI]

Turbomachinery Laboratory. Two FOSGs were placed approximately 90? apart on two separate poles of one of the bearings, and the strain levels for different load magnitudes and directions were measured. The raw signal has several undesirable attributes...

Raymer, Stephen Geoffrey

2000-01-01T23:59:59.000Z

398

Cooling system for a bearing of a turbine rotor  

DOE Patents [OSTI]

In a gas turbine, a bore tube assembly radially inwardly of an aft bearing conveys cooling steam to the buckets of the turbine and returns the cooling steam to a return. To cool the bearing and thermally insulate the bearing from the cooling steam paths, a radiation shield is spaced from the bore tube assembly by a dead air gap. Additionally, an air passageway is provided between the radiation shield and the inner surface of an aft shaft forming part of the rotor. Air is supplied from an inlet for flow along the passage and radially outwardly through bores in the aft shaft disk to cool the bearing and insulate it from transfer of heat from the cooling steam.

Schmidt, Mark Christopher (Niskayuna, NY)

2002-01-01T23:59:59.000Z

399

Ecological effects of contaminants and remedial actions in Bear Creek  

SciTech Connect (OSTI)

Ecological studies of the Bear Creek watershed, which drains the area surrounding several Oak Ridge Y-12 Plant waste disposal facilities, were initiated in May 1984 and are continuing at present. These studies consisted of an initial, detailed characterization of the benthic invertebrate and fish communities in Bear Creek, and they were followed by a presently ongoing monitoring phase that involves reduced sampling intensities. The characterization phase utilized two approaches: (1) instream sampling of benthic invertebrate and fish communities in Bear Creek to identify spatial and temporal patterns in distribution and abundance and (2) laboratory bioassays on water samples from Bear Creek and selected tributaries to identify potential sources of toxicity to biota. The monitoring phase of the ecological program relates to the long-term goals of identifying and prioritizing contaminant sources and assessing the effectiveness of remedial actions. It continues activities of the characterization phase at less frequent intervals. The Bear Greek Valley is a watershed that drains the area surrounding several closed Oak Ridge Y-12 Plant waste disposal facilities. Past waste disposal practices in Bear Creek Valley resulted in contamination of Bear Creek and consequent ecological damage. Extensive remedial actions have been proposed at waste sites, and some of the have been implemented or are now underway. The proposed study plan consists of an initial, detailed characterization of the benthic invertebrate and fish communities in Bear Creek in the first year followed by a reduction in sampling intensity during the monitoring phase of the plan. The results of sampling conducted from May 1984 through early 1989 are presented in this report.

Southworth, G.R.; Loar, J.M.; Ryon, M.G.; Smith, J.G.; Stewart, A.J. [Oak Ridge National Lab., TN (United States); Burris, J.A. [C. E. Environmental, Inc., Tallahassee, FL (United States)

1992-01-01T23:59:59.000Z

400

High performance magnetic bearing systems using high temperature superconductors  

DOE Patents [OSTI]

A magnetic bearing apparatus and a method for providing at least one stabilizing force in a magnetic bearing structure with a superconducting magnetic assembly and a magnetic assembly, by providing a superconducting magnetic member in the superconducting magnetic assembly with a plurality of domains and arranging said superconducting magnetic member such that at least one domain has a domain C-axis vector alignment angularly disposed relative to a reference axis of the magnetic member in the magnetic assembly.

Abboud, Robert G. (Barrington Hills, IL)

1998-01-01T23:59:59.000Z

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


401

High performance magnetic bearing systems using high temperature superconductors  

DOE Patents [OSTI]

Disclosed are a magnetic bearing apparatus and a method for providing at least one stabilizing force in a magnetic bearing structure with a superconducting magnetic assembly and a magnetic assembly, by providing a superconducting magnetic member in the superconducting magnetic assembly with a plurality of domains and arranging said superconducting magnetic member such that at least one domain has a domain C-axis vector alignment angularly disposed relative to a reference axis of the magnetic member in the magnetic assembly. 7 figs.

Abboud, R.G.

1998-05-05T23:59:59.000Z

402

Notes 14. Experimental identification of bearing force coefficients  

E-Print Network [OSTI]

An example of system parameter identification (Hybrid Brush Seal) Luis San Andr?s (lecturer) Thanks to Adolfo Delgado, Jos? Baker (RAs) & support from Siemens Power Generation MEEN 617 - April 2008 Structural parameters K shaft = 243 lbf/in (42...Notes 14. IDENTIFICATION OF BEARING FORCE COEFFICIENTS. ? Dr. Luis San Andr?s (2009) 1 Handout # 14 (MEEN 626) Application example Experimental identification of bearing force coefficients Experimental identification of the dynamic force...

San Andres, Luis

2009-01-01T23:59:59.000Z

403

White-Etching Matter in Bearing Steel. Part II: Distinguishing Cause and Effect in Bearing Steel Failure  

E-Print Network [OSTI]

The premature failure of large bearings of the type used in wind turbines, possibly through a mechanism called “white-structure flaking”, has triggered many studies of microstructural damage associated with “white-etching areas” created during...

Solano-Alvarez, W.; Bhadeshia, H. K. D. H.

2014-07-11T23:59:59.000Z

404

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

Broader source: Energy.gov [DOE]

The Office of Fossil Energy gives notice of receipt of an application filed on February 25, 2015, by Bear Head LNG, requesting long-term multi-contract authority as further described in their...

405

Diamond detector for high rate monitors of fast neutrons beams  

SciTech Connect (OSTI)

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}.

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

406

Diamond tool wear vs cutting distance on electroless nickel mirrors  

SciTech Connect (OSTI)

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.

Syn, C.K.; Taylor, J.S.; Donaldson, R.R.

1986-10-14T23:59:59.000Z

407

High-power TSP bits. [Thermally Stable Polycrystalline diamond  

SciTech Connect (OSTI)

This paper reviews a three-year R D project to develop advanced thermally stable polycrystalline diamond (TSP) bits that can operate at power levels 5 to 10 times greater than those typically delivered by rotary rigs. These bits are designed to operate on advanced drilling motors that drill 3 to 6 times faster than rotary rigs. TSP bit design parameters that were varied during these tests include cutter size, shape, density, and orientation. Drilling tests conducted in limestone, sandstone, marble, and granite blocks showed that these optimized bits drilled many of these rocks at 500 to 1,000 ft/hr (150 to 300 m/h), compared to 50 to 100 ft/hr (15 to 30 m/h) for roller bits. These tests demonstrated that TSP bits are capable of operating at the high speeds and high torques delivered by advanced drilling motors now being developed. These advanced bits and motors are designed for use in slim-hole and horizontal drilling applications.

Cohen, J.H.; Maurer, W.C. (Maurer Engineering Inc., Houston, TX (United States)); Westcott, P.A. (Gas Research Inst., Chicago, IL (United States))

1994-03-01T23:59:59.000Z

408

Kinetically Inhibited Order in a Diamond-Lattice Antiferromagnet  

SciTech Connect (OSTI)

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.

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

409

DARKNESS, TWILIGHT, AND DAYLIGHT FORAGING SUCCESS OF BEARS (URSUS AMERICANUS) ON SALMON  

E-Print Network [OSTI]

DARKNESS, TWILIGHT, AND DAYLIGHT FORAGING SUCCESS OF BEARS (URSUS AMERICANUS) ON SALMON IN COASTAL (2000­2002). Bears (maximum 7 simultaneously) were primarily active during daylight near the onset with other bears (4%). Scavenging was greatest during daylight (19%) and lowest during darkness (3%). Bears

Reimchen, Thomas E.

410

Fasteners -- Preloading test for the detection of hydrogen embrittlement -- Parallel bearing surface method  

E-Print Network [OSTI]

Fasteners -- Preloading test for the detection of hydrogen embrittlement -- Parallel bearing surface method

International Organization for Standardization. Geneva

1999-01-01T23:59:59.000Z

411

Diamond and Hydrogenated Carbons for Advanced Batteries and Fuel Cells: Fundamental Studies and Applications.  

SciTech Connect (OSTI)

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.

Swain; Greg M.

2009-04-13T23:59:59.000Z

412

Ferromagnetic ordering of Cr and Fe doped p-type diamond: An ab initio study  

SciTech Connect (OSTI)

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.

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

413

Electron microscopic evidence for a tribologically induced phase transformation as the origin of wear in diamond  

SciTech Connect (OSTI)

Tribological testing of a coarse-grained diamond layer, deposited by plasma-enhanced chemical vapor deposition, was performed on a ring-on-ring tribometer with a diamond counterpart. The origin of the wear of diamond and of the low friction coefficient of 0.15 was studied by analyzing the microstructure of worn and unworn regions by transmission and scanning electron microscopy. In the worn regions, the formation of an amorphous carbon layer with a thickness below 100?nm is observed. Electron energy loss spectroscopy of the C-K ionization edge reveals the transition from sp{sup 3}-hybridized C-atoms in crystalline diamond to a high fraction of sp{sup 2}-hybridized C-atoms in the tribo-induced amorphous C-layer within a transition region of less than 5?nm thickness. The mechanically induced phase transformation from diamond to the amorphous phase is found to be highly anisotropic which is clearly seen at a grain boundary, where the thickness of the amorphous layer above the two differently oriented grains abruptly changes.

Zhang, Xinyi; Schneider, Reinhard; Müller, Erich; Gerthsen, Dagmar [Laboratory for Electron Microscopy, Karlsruhe Institute of Technology (KIT), Engesserstr. 7, D-76131 Karlsruhe (Germany); Mee, Manuel; Meier, Sven [Fraunhofer Institute for Mechanics of Materials IWM, Wöhlerstr. 11, D-79108 Freiburg (Germany); Gumbsch, Peter [Fraunhofer Institute for Mechanics of Materials IWM, Wöhlerstr. 11, D-79108 Freiburg (Germany); Institute for Applied Materials IAM, Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, D-76131 Karlsruhe (Germany)

2014-02-14T23:59:59.000Z

414

Creation of deep blue light emitting nitrogen-vacancy center in nanosized diamond  

SciTech Connect (OSTI)

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.

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

415

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

E-Print Network [OSTI]

Objectives 1 II LITERATURE REVIEW 3 Analytical Models 3 Experimental Investigations 4 III TEST BEARING 6 RL10 Angular Contact Ball Bearing 6 IV TEST RIG 7 V EXPERIMENTAL SETUP AND PROCEDURES 10 Static Pedestal Pull Tests 10 Static Bearing Pull Tests... components created a natural frequency that was primarily dependent on the test bearing stiffness. 4 5 1 Driver (air turbine) 2 Driver support 3 Coupling 4 Pocket damper seal 5 Rotor wheel 6 RL10 test bearing 7 Shaft 8 Slave bearing 9 Bearing...

Schmidt, Brent Lee

2012-06-07T23:59:59.000Z

416

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

417

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]

**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

Massachusetts at Lowell, University of

418

singapore_composites5.doc submitted to World Scientific 22/10/2003 -14:46 1/1 DIAMOND-FIBRE REINFORCED PLASTIC COMPOSITES  

E-Print Network [OSTI]

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

Bristol, University of

419

Validating optical emission spectroscopy as a diagnostic of microwave activated CH4/Ar/H2 plasmas used for diamond chemical vapor deposition  

E-Print Network [OSTI]

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

Bristol, University of

420

Effects of thickness and cycle parameters on fretting wear behavior of CVD diamond coatings on steel substrates  

E-Print Network [OSTI]

of low friction, high hardness, high wear resistance, as well as promising corrosion resistance. © 2010 of thermal expansion between diamond and steel may induce high stress within the deposited diamond films c a School of Materials Science and Engineering, Central South University, Changsha, 410083, PR

Bristol, University of

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


421

Plasma-activated direct bonding of diamond-on-insulator wafers to thermal oxide grown silicon wafers  

E-Print Network [OSTI]

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

Akin, Tayfun

422

Experimental response of a rotor supported on Rayleigh step gas bearings  

E-Print Network [OSTI]

1 INTRODUCTION Micro-turbomachinery demands gas bearings to ensure compactness, lightweight and extreme temperature operation [1, 2]. Gas film bearings, unlike oil-lubricated bearings, offer advantages of low friction and less heat... and complex sealing and lubricant circulation systems. Furthermore, these oil-free bearing applications eliminate process fluid contamination and are environmental friendly. The main disadvantages of gas film bearings are little damping and low load...

Zhu, Xuehua

2004-11-15T23:59:59.000Z

423

Ultraviolet photosensitivity of sulfur-doped micro- and nano-crystalline diamond  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

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.

Mendoza, Frank; Makarov, Vladimir; Hidalgo, Arturo; Weiner, Brad; Morell, Gerardo

2011-06-06T23:59:59.000Z

424

Efficient readout of a single spin state in diamond via spin-to-charge conversion  

E-Print Network [OSTI]

Efficient readout of 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 a new method for efficient spin readout of nitrogen-vacancy (NV) centers in diamond. The method is based on conversion of the electronic spin state of the NV to a charge state distribution, followed by single-shot readout of the charge state. Conversion is achieved through a spin-dependent photoionization process in diamond at room temperature. Using NVs in nanofabricated diamond beams, we demonstrate that the resulting spin readout noise is within a factor of three of the spin projection noise level. Applications of this technique for nanoscale magnetic sensing are discussed.

B. J. Shields; Q. P. Unterreithmeier; N. P. de Leon; H. Park; M. D. Lukin

2014-10-01T23:59:59.000Z

425

Nano-fabricated solid immersion lenses registered to single emitters in diamond  

E-Print Network [OSTI]

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.

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

426

Development of Designer Diamond Technology for High Pressure High Temperature Experiments in Support of Stockpile Stewardship Program  

SciTech Connect (OSTI)

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.

Vohra, Yogesh, K.

2009-10-28T23:59:59.000Z

427

Levitation pressure and friction losses in superconducting bearings  

DOE Patents [OSTI]

A superconducting bearing having at least one permanent magnet magnetized with a vertical polarization. The lower or stator portion of the bearing includes an array of high-temperature superconducting elements which are comprised of a plurality of annular rings. An annular ring is located below each permanent magnet and an annular ring is offset horizontally from at least one of the permanent magnets. The rings are composed of individual high-temperature superconducting elements located circumferentially along the ring. By constructing the horizontally-offset high-temperature superconducting ring so that the c-axis is oriented in a radial direction, a higher levitation force can be achieved. Such an orientation will also provide substantially lower rotational drag losses in the bearing.

Hull, John R. (Downers Grove, IL)

2001-01-01T23:59:59.000Z

428

Design of flexible ultrahigh-Q microcavities in diamond-based photonic crystal slabs  

E-Print Network [OSTI]

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 $Vdesign is flexible 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.

Snjezana Tomljenovic-Hanic; Andrew D. Greentree; C. Martijn de Sterke; Steven Prawer

2008-12-10T23:59:59.000Z

429

Synthesis of new Diamond-like B-C Phases under High Pressure and Temperatures  

SciTech Connect (OSTI)

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.

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

430

Photo-stimulated low electron temperature high current diamond film field emission cathode  

DOE Patents [OSTI]

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.

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

431

4e-condensation in a fully frustrated Josephson junction diamond chain  

SciTech Connect (OSTI)

Fully frustrated one-dimensional diamond Josephson chains have been shown [B. Doucot and J. Vidal, Phys. Rev. Lett. 88, 227005 (2002)] to possess a remarkable property: The superfluid phase occurs through the condensation of pairs of Cooper pairs. By means of Monte Carlo simulations we analyze quantitatively the insulator to 4e-superfluid transition. We determine the location of the critical point and discuss the behavior of the phase-phase correlators. For comparison, we also present the case of a diamond chain at zero and 1/3 frustration where the standard 2e-condensation is observed.

Rizzi, Matteo [NEST CNR-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa (Italy); Cataudella, Vittorio [COHERENTIA CNR-INFM and Dipartimento di Fisica, Universit Federico II, 80126 Napoli (Italy); Fazio, Rosario [NEST CNR-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa (Italy); International School for Advanced Studies (SISSA), via Beirut 2-4, I-34014, Trieste (Italy)

2006-03-01T23:59:59.000Z

432

Isotope engineering of silicon and diamond for quantum computing and sensing applications  

E-Print Network [OSTI]

Some of the stable isotopes of silicon and carbon have zero nuclear spin, whereas many of the other elements that constitute semiconductors consist entirely of stable isotopes that have nuclear spins. Silicon and diamond crystals composed of nuclear-spin-free stable isotopes (Si-28, Si-30, or C-12) are considered to be ideal host matrixes to place spin quantum bits (qubits) for quntum computing and sensing applications because their coherent properties are not disrupted thanks to the absence of host nuclear spins. The present article describes the state-of-the-art and future perspective of silicon and diamond isotope engineering for development of quantum information processing devices.

Kohei M. Itoh; Hideyuki Watanabe

2014-10-15T23:59:59.000Z

433

Notes 06. Liquid cavitation in fluid film bearings  

E-Print Network [OSTI]

[s] U ?R. Journal surface speed [m/s] V dh/dt. Squeeze film velocity [m/s] X= ?R, y, z Coordinate system on plane of bearing ? ()/ cav ?? . Density ratio ? P ? ? ? ? . Liquid bulk-modulus [N/m 2 ] ? Liquid density [kg/m 3 ] cav... ? Density at Pcav [kg/m 3 ] ? Fluid absolute viscosity [N.s/m 2 ] ? Journal angular speed (rad/s) Subscripts * Inception of the cavitation zone a Ambient value cav Cavitation NOTES 6. CAVITATION IN LIQUID FILM BEARINGS. Dr. Luis San Andr?s ? 2009...

San Andres, Luis

2009-01-01T23:59:59.000Z

434

Seismic base isolation: Elastomer characterization, bearing modeling and system response  

SciTech Connect (OSTI)

This paper discusses several major aspects of seismic base isolation systems that employ laminated elastomer bearings. Elastomer constitutive models currently being used to represent the nonlinear elastic and hysteretic behavior are discussed. Some aspects of mechanical characterization testing of elastomers is presented along with representative tests results. The development of a finite element based mesh generator for laminated elastomer bearings is presented. Recent advances in the simulation of base isolated structures to earthquake motions are presented along with a sample problem. 13 refs., 19 figs., 1 tab.

Kulak, R.F.; Wang, C.Y.; Hughes, T.H.

1991-01-01T23:59:59.000Z

435

Microsoft PowerPoint - Module 10f - GT PCS - final.ppt [Compatibility...  

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

Oil Radial Bearing Oil Radial & Thrust Bearing Dry Gas Seal Dry Gas Seal Oil Radial & Thrust Bearing Dry Gas Speed (rpm): Flow (kgs): 193 Seal Oil Radial Bearings Oil Radial...

436

BIG BEAR SOLAR OBSERVATORY CENTER FOR SOLAR-TERRESTRIAL RESEARCH  

E-Print Network [OSTI]

BIG BEAR SOLAR OBSERVATORY CENTER FOR SOLAR-TERRESTRIAL RESEARCH Faculty Position in Solar Physics, New Jersey Institute of Technology A tenure track faculty position in solar physics is available of NJIT's program in solar physics, visit http://solar.njit.edu. Applicants are required to have a Ph

437

Do bears facilitate transfer of salmon resources to aquatic macroinvertebrates?  

E-Print Network [OSTI]

- tigated whether foraging activities of bears facilitate growth of stream invertebrates by increasing scavengers are likely highly patchy in time and space. Résumé : Dans les régions côtières pacifiques du nord

Palen, Wendy J.

438

Author's Accepted Manuscript Aircraft Landing Gear Greased Slider Bearing  

E-Print Network [OSTI]

. Numerical results indicate fundamental differences in fluid flow behavior between greased and oil-lubricated in order to design high efficiency bearings. For more than 30 years, lubrication studies have been extended to include tem- perature effects [2]. Many of the thermo-elasto-hydrodynamic (TEHD) studies were steady

439

Gearbox Reliability Collaborative High Speed Shaft Tapered Roller Bearing Calibration  

SciTech Connect (OSTI)

The National Renewable Energy Laboratory (NREL) Gearbox Reliability Collaborative (GRC) is a project investigating gearbox reliability primarily through testing and modeling. Previous dynamometer testing focused upon acquiring measurements in the planetary section of the test gearbox. Prior to these tests, the strain gages installed on the planetary bearings were calibrated in a load frame.

Keller, J.; Guo, Y.; McNiff, B.

2013-10-01T23:59:59.000Z

440

Bitumen-bearing deposits of the United States  

SciTech Connect (OSTI)

Descriptions, resources, and petrophysical properties of bitumen-bearing rocks, or tar sands, in the United States are summarized by state and their locations indicated on the accompanying maps. One hundred ninety-eight identified deposits in 17 states yield a total bitumen resource estimated to be 57 billion barrels.

Crysdale, B.L.; Schenk, C.J.

1988-01-01T23:59:59.000Z

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


441

Correspondence Laboratory observations of debris-bearing ice facies frozen  

E-Print Network [OSTI]

, others argue that supercooling is not the only mechanism for producing thick basal ice sequencesCorrespondence Laboratory observations of debris-bearing ice facies frozen from supercooled water. Supercooling has been invoked to explain anomalously thick basal ice sequences beneath temperate glaciers

Knight, Peter G.

442

Synthesis and characterization of thorium-bearing britholites Olivier Terraa  

E-Print Network [OSTI]

1 20/12/2006 Synthesis and characterization of thorium-bearing britholites Olivier Terraa. In order to simulate tetravalent minor actinides, the incorporation of thorium, through dry chemical routes that the incorporation of thorium was effective whatever the thorium reagent used or the grinding conditions considered

Paris-Sud XI, Université de

443

Notes 09. Fluid inertia and turbulence in fluid film bearings  

E-Print Network [OSTI]

. Luis San Andr?s ? 2009 14 References: Constantinescu, V.N., 1962, ?Analysis of Bearings Operating in the Turbulent Flow Regime,? ASME Journal of Lubrication Technology, Vol. 82, pp. 139-151. Hashimoto, H., S. Wada, M. Sumitomo, 1989, ?The Effects...

San Andres, Luis

2009-01-01T23:59:59.000Z

444

Optimization of superconducting tiling pattern for superconducting bearings  

DOE Patents [OSTI]

An apparatus and method for reducing magnetic field inhomogeneities which produce rotational loss mechanisms in high temperature superconducting magnetic bearings are disclosed. Magnetic field inhomogeneities are reduced by dividing high temperature superconducting structures into smaller structures, and arranging the smaller structures into tiers which stagger the magnetic field maximum locations of the smaller structures. 20 figs.

Hull, J.R.

1996-09-17T23:59:59.000Z

445

Optimization of superconducting tiling pattern for superconducting bearings  

DOE Patents [OSTI]

An apparatus and method for reducing magnetic field inhomogeneities which produce rotational loss mechanisms in high temperature superconducting magnetic bearings. Magnetic field inhomogeneities are reduced by dividing high temperature superconducting structures into smaller structures, and arranging the smaller structures into tiers which stagger the magnetic field maximum locations of the smaller structures.

Hull, John R. (Hinsdale, IL)

1996-01-01T23:59:59.000Z

446

Feature Evaluation for Effective Bearing Prognostics , K. Medjaherb  

E-Print Network [OSTI]

account for the 40% of motor faults according to the research conducted by Electric Power Research in the vibration frequency [2] and vibration analysis is considered as the most reliable method in bearing failure detection [6]-[9]. However, it is often difficult to extract the failure signature due to the noise

Paris-Sud XI, Université de

447

Rotordynamic evaluation of a tangential-injection hybrid bearing  

E-Print Network [OSTI]

, and Cre = 0.001 . Data are presented for 550C water at three speeds out to 25000 rpm and three pressures out to 7.0 MPa. Compared to a radial-injection hybrid bearing, experiments show injection against rotation enhances stability, yielding reductions...

Laurant, Franck Jean

1998-01-01T23:59:59.000Z

448

Waste Isolation Pilot Plant Nitrate Salt Bearing Waste Container  

E-Print Network [OSTI]

of Energy (DOE) and Nuclear Waste Partnership LLC (NWP), collectively referred to as the Permittees Isolation Plan (Plan) for identified nitrate salt bearing waste disposed in the Waste Isolation Pilot Plant detailed proposal for the expedited closure of underground Hazardous Waste Disposal Unit (HWDU) Panel 6, so

Napp, Nils

449

Spectroscopic Evidence for Uranium Bearing Precipitates in Vadose Zone  

E-Print Network [OSTI]

Spectroscopic Evidence for Uranium Bearing Precipitates in Vadose Zone Sediments at the Hanford 300, Advanced Light Source, One Cyclotron Road, Berkeley, California 94720, United States Geological Survey Northwest Laboratory, Richland, Washington 99352 Uranium (U) solid-state speciation in vadose zone sediments

450

Coherent interference effects in a nano-assembled diamond NV center  

E-Print Network [OSTI]

-Packard Laboratories, 1501 Page Mill Rd, Palo Alto, CA 94304, USA Presently with Hewlett-Packard Laboratories, 1501 Page Mill Rd, Palo Alto, CA 94304, USA paul.barclay@hp.com Abstract: Diamond nanocrystals containing NV, P. Olivero, A. D. Greentree, S. Prawer, F. Jelezko, and P. Hemmer, "Coherent Population Trapping

Painter, Oskar

451

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

452

AIR FLOW DISTRIBUTION IN A HIGH-RISE RESIDENTIAL Helmut E. Feustel and Richard C. Diamond  

E-Print Network [OSTI]

AIR FLOW DISTRIBUTION IN A HIGH-RISE RESIDENTIAL BUILDING Helmut E. Feustel and Richard C. Diamond Lawrence Berkeley National Laboratory, Berkeley, USA ABSTRACT The provision of ventilation air for high-rise multifamily housing has plagued retrofit practitioners and researchers alike. We have been studying the air

Diamond, Richard

453

Porous Boron-Doped Diamond/Carbon Nanotube Electrodes H. Zanin,*,  

E-Print Network [OSTI]

with BDD (large potential window, chemical inertness, low background levels), but also they have application in electronics and sensors, such B-doped diamond (BDD) films are increasingly being used and a very low background current, in addition to chemical and physical stability.7 Planar BDD electrodes

Bristol, University of

454

Slide diamond burnishing of tool steels with adhesive coatings and diffusion layers  

E-Print Network [OSTI]

Slide diamond burnishing of tool steels with adhesive coatings and diffusion layers W. Brostow*1 with a scratch tester. A combination of both approaches, slide burnishing with hard chrome coating and/or slide in manufacturing tools and structural elements in automotive and aerospace industries. Keywords: Tool steels, Slide

North Texas, University of

455

Automated Testing of HVAC Systems for Commissioning Tim Salsbury and Rick Diamond  

E-Print Network [OSTI]

Automated Testing of HVAC Systems for Commissioning Tim Salsbury and Rick Diamond Lawrence Berkeley of the commissioning of HVAC systems. The approach is based on software that generates a sequence of test signals for new and retrofit projects. Introduction The performance of many HVAC systems is limited more by poor

Diamond, Richard

456

Diamond anvil cell for spectroscopic investigation of materials at high temperature, high pressure and shear  

DOE Patents [OSTI]

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.

Westerfield, C.L.; Morris, J.S.; Agnew, S.F.

1997-01-14T23:59:59.000Z

457

High quality factor nanocrystalline diamond micromechanical resonators limited by thermoelastic damping  

SciTech Connect (OSTI)

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.

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

458

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

459

Method to grow pure nanocrystalline diamond films at low temperatures and high deposition rates  

DOE Patents [OSTI]

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.

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

460

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

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


461

PHYSICAL REVIEW B 83, 193410 (2011) Denser than diamond: Ab initio search for superdense carbon allotropes  

E-Print Network [OSTI]

. 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

Oganov, Artem R.

462

Thermal conductance of metal-diamond interfaces at high pressure Gregory T. Hohensee  

E-Print Network [OSTI]

are concerned with the exchange of thermal energy across an interface between two materials. This topic-nonmetal interface, a two-temperature model predicts a thermal resistance of Rep = 1/ gL in series with the phononThermal conductance of metal-diamond interfaces at high pressure Gregory T. Hohensee Department

Cahill, David G.

463

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

464

X-Ray Diamond Anvil Cell Facility at NSLS: 2010 Progress Report  

E-Print Network [OSTI]

X-Ray Diamond Anvil Cell Facility at NSLS: 2010 Progress Report Zhiqiang ChenZhiqiang Chen Stony) Powder X-ray Diffraction, Total Scattering Pair-Distributiony , g Function (PDF) under high P and high, yield strength, amorphization, texturing, compressibility Hydrothermal DAC (Bassett) Angle Dispersive X-ray

Duffy, Thomas S.

465

Diamonds as timing detectors for MIP: The HADES proton-beam monitor and start detectors  

E-Print Network [OSTI]

This paper gives an overview of a recent development of measuring time of flight of minimum-ionizing particles (MIP) with mono-crystalline diamond detectors. The application in the HADES spectrometer as well as test results obtained with proton beams are discussed.

J. Pietraszko; L. Fabbietti; W. Koenig

2009-11-02T23:59:59.000Z

466

Diamonds as timing detectors for MIP: The HADES proton-beam monitor and start detectors  

E-Print Network [OSTI]

This paper gives an overview of a recent development of measuring time of flight of minimum-ionizing particles (MIP) with mono-crystalline diamond detectors. The application in the HADES spectrometer as well as test results obtained with proton beams are discussed.

,

2009-01-01T23:59:59.000Z

467

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

SciTech Connect (OSTI)

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.

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

468

A Novel Computational Model for Tilting Pad Journal Bearings with Soft Pivot Stiffnesses  

E-Print Network [OSTI]

A novel tilting pad journal bearing model including pivot flexibility as well as temporal fluid inertia effects on the thin film fluid flow aims to accurately predict the bearing forced performance. The predictive model also accounts for the thermal...

Tao, Yujiao 1988-

2012-12-10T23:59:59.000Z

469

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

E-Print Network [OSTI]

Micro-turbomachinery (MTM) implements gas bearings in compact units of enhanced mechanical reliability. Gas bearings, however, have little damping and are prone to wear during frequent rotor start-up and shut down conditions. Externally pressurized...

Ryu, Keun

2009-05-15T23:59:59.000Z

470

Simulation of the dynamic behaviour of a geared transmission on hydrodynamic journal bearings  

E-Print Network [OSTI]

and bearings, oil injection, thermal effects, non Newtonian lubricant, etc. On the other hand, the dynamic whose reactions are calculated solving the lubrication equation presented in [3] under the short bearing

Paris-Sud XI, Université de

471

Measurements of static loading characteristics of a Flexurepivot Tilt Pad Hydrodynamic Bearing  

E-Print Network [OSTI]

An experimental investigation examining the static loading characteristics of a four-pad, KMC FLEXUREPIVOT Tilt Pad Hydrodynamic Bearing is presented. Tests are conducted on the TRACE Fluid Film Bearing Element Test Rig for journal speeds ranging...

Walton, Nicholas Van Edward

1995-01-01T23:59:59.000Z

472

E-Print Network 3.0 - alumina-on-polyethylene bearing surfaces...  

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

on-polyethylene bearing surfaces Search Powered by Explorit Topic List Advanced Search Sample search results for: alumina-on-polyethylene bearing surfaces Page: << < 1 2 3 4 5 > >>...

473

Bearing options, including design and testing, for direct drive linear generators in wave energy converters   

E-Print Network [OSTI]

The key focus of this research was to investigate the bearing options most suited to operation in a novel direct drive linear generator. This was done through bearing comparisons, modelling and testing. It is fundamental ...

Caraher, Sarah

2011-11-22T23:59:59.000Z

474

Advances in hybrid water-lubricated journal bearings for use in ocean vessels  

E-Print Network [OSTI]

The outboard bearings that support shafts in naval ships and submarines present unique challenges to designers, shipbuilders, and operators. Such bearings must operate continuously and reliably in demanding environments ...

Heberley, Brian Douglas

2013-01-01T23:59:59.000Z

475

Analysis of electrical signatures in synchronous generators characterized by bearing faults  

E-Print Network [OSTI]

Synchronous generators play a vital role in power systems. One of the major mechanical faults in synchronous generators is related to bearings. The popular vibration analysis method has been utilized to detect bearing faults for years. However...

Choi, Jae-Won

2009-05-15T23:59:59.000Z

476

Transient Lift-off Test Results for an Experimental Hybrid Bearing in Air  

E-Print Network [OSTI]

by Pavelek [6].................................................................9 Fig. 6 Hybrid bearing pressure ration vs. orifice diameter by Pavelek [6] ......................10 Fig. 7 Assembly of the test rig with instrumentation from Borchard [5... -1 ] LOL Load on land LOR Load on recess INTRODUCTION Turbo-pump applications that use ball bearings in cryogenic fluids can experience rapid wear when the pump is at full power, limiting the life of the bearing. Hybrid bearings...

Klooster, David

2011-02-22T23:59:59.000Z

477

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

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

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

478

Wind Turbine Design Guideline DG03: Yaw and Pitch Rolling Bearing Life  

SciTech Connect (OSTI)

This report describes the design criteria, calculation methods, and applicable standards recommended for use in performance and life analyses of ball and roller (rolling) bearings for yaw and pitch motion support in wind turbine applications. The formulae presented here for rolling bearing analytical methods and bearing-life ratings are consistent with methods in current use by wind turbine designers and rolling-bearing manufacturers.

Harris, T.; Rumbarger, J. H.; Butterfield, C. P.

2009-12-01T23:59:59.000Z

479

Field Metabolic Rate and PCB Adipose Tissue Deposition Efficiency in East Greenland Polar Bears Derived from  

E-Print Network [OSTI]

Field Metabolic Rate and PCB Adipose Tissue Deposition Efficiency in East Greenland Polar Bears metabolic rates (FMR) and CB153 deposition efficiencies in East Greenland polar bears. Our simulations Greenland polar bears. Citation: Pavlova V, Nabe-Nielsen J, Dietz R, Svenning J-C, Vorkamp K, et al. (2014

Schierup, Mikkel Heide

480

Nonlinear Dynamics of a Rotor Supported by Homopolar Magnetic Bearings with Saturation  

E-Print Network [OSTI]

magnetic bearing model. The nonlinear dynamics of permanent magnet-biased homopolar magnetic bearing (PMB HoMB) system with 2-dof rigid and 4-dof flexible rotor is analyzed. The dynamic behavior of the rotor-bearing system is examined in the feedback...

Kang, Kyungdae

2011-02-22T23:59:59.000Z

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


481

Bearing Fault Detection in DFIG-Based Wind Turbines Using the First Intrinsic Mode Function  

E-Print Network [OSTI]

Bearing Fault Detection in DFIG-Based Wind Turbines Using the First Intrinsic Mode Function Y for bearing fault detection in DFIG-based wind turbines. The proposed method uses the first Intrinsic Mode Terms--Wind turbine, Doubly Fed Induction Generator (DFIG), fault detection, bearings, signal processing

Boyer, Edmond

482

Induction Motors Bearing Failures Detection and Diagnosis: Park and Concordia Transform  

E-Print Network [OSTI]

to metallurgical damage from interrupted electrical current flow. Increased noise and vibration are typicalInduction Motors Bearing Failures Detection and Diagnosis: Park and Concordia Transform Approaches with the problem of bearing failure detection and diagnosis in induction motors. Indeed, bearings deterioration

Boyer, Edmond

483

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

E-Print Network [OSTI]

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

Jahns, Jürgen

484

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

SciTech Connect (OSTI)

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.

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

485

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

E-Print Network [OSTI]

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

Currie, Thomas E

2010-01-01T23:59:59.000Z

486

Failure Atlas for Rolling Bearings in Wind Turbines  

SciTech Connect (OSTI)

This Atlas is structured as a supplement to the book: T.E. Tallian: Failure Atlas for Hertz Contact Machine Elements, 2nd edition, ASME Press New York, (1999). The content of the atlas comprises plate pages from the book that contain bearing failure images, application data, and descriptions of failure mode, image, and suspected failure causes. Rolling bearings are a critical component of the mainshaft system, gearbox and generator in the rapidly developing technology of power generating wind turbines. The demands for long service life are stringent; the design load, speed and temperature regimes are demanding and the environmental conditions including weather, contamination, impediments to monitoring and maintenance are often unfavorable. As a result, experience has shown that the rolling bearings are prone to a variety of failure modes that may prevent achievement of design lives. Morphological failure diagnosis is extensively used in the failure analysis and improvement of bearing operation. Accumulated experience shows that the failure appearance and mode of failure causation in wind turbine bearings has many distinguishing features. The present Atlas is a first effort to collect an interpreted database of specifically wind turbine related rolling bearing failures and make it widely available. This Atlas is structured as a supplement to the book: T. E. Tallian: Failure Atlas for Hertz Contact Machine Elements, 2d edition, ASME Press New York, (1999). The main body of that book is a comprehensive collection of self-contained pages called Plates, containing failure images, bearing and application data, and three descriptions: failure mode, image and suspected failure causes. The Plates are sorted by main failure mode into chapters. Each chapter is preceded by a general technical discussion of the failure mode, its appearance and causes. The Plates part is supplemented by an introductory part, describing the appearance classification and failure classification systems used, and by several indexes. The present Atlas is intended as a supplement to the book. It has the same structure but contains only Plate pages, arranged in chapters, each with a chapter heading page giving a short definition of the failure mode illustrated. Each Plate page is self contained, with images, bearing and application data, and descriptions of the failure mode, the images and the suspected causes. Images are provided in two resolutions: The text page includes 6 by 9 cm images. In addition, high resolution image files are attached, to be retrieved by clicking on their 'push pin' icon. While the material in the present Atlas is self-contained, it is nonetheless a supplement to the book and the complete interpretation of the terse image descriptions and of the system underlying the failure code presupposes familiarity with the book. Since this Atlas is a supplement to the book, its chapter numbering follows that of the book. Not all failure modes covered in the book have been found among the observed wind turbines. For that reason, and because of the omission of introductory matter, the chapter numbers in this Atlas are not a continuous sequence.

Tallian, T. E.

2006-01-01T23:59:59.000Z

487

Notes 15. Gas Bearings for oil-free MTM  

E-Print Network [OSTI]

kWatt 4 Micro Gas Turbines 100 Turbec, ABB & Volvo 70, 250 Ingersoll Rand 175 General Electric 35, 60, 80, 150 Elliott Energy Systems 30, 60, 200 Capstone 25, 80 Bowman OUTPUT POWER (kW) MANUFACTURER Microturbine Power Conversion Technology Review... (MMFB) Bearing Cartridge, metal mesh ring and top foil Hydrodynamic air film between rotating shaft and top foil Applications: ACMs, micro gas turbines, turbo expanders, turbo compressors, turbo blowers, automotive turbochargers, APUs ? Large damping...

San Andres, Luis

2010-01-01T23:59:59.000Z

488

Uranium- and thorium-bearing pegmatites of the United States  

SciTech Connect (OSTI)

This report is part of the National Uranium Resource Evaluation (NURE) Program designed to identify criteria favorable for the occurrence of the world's significant uranium deposits. This project deals specifically with uranium- and thorium-bearing pegmatites in the United States and, in particular, their distribution and origin. From an extensive literature survey and field examination of 44 pegmatite localities in the United States and Canada, the authors have compiled an index to about 300 uranium- and thorium-bearing pegmatites in the United States, maps giving location of these deposits, and an annotated bibliography to some of the most pertinent literature on the geology of pegmatites. Pegmatites form from late-state magma differentiates rich in volatile constituents with an attendant aqueous vapor phase. It is the presence of an aqueous phase which results in the development of the variable grain size which characterizes pegmatites. All pegmatites occur in areas of tectonic mobility involving crustal material usually along plate margins. Those pegmatites containing radioactive mineral species show, essentially, a similar distribution to those without radioactive minerals. Criteria such as tectonic setting, magma composition, host rock, and elemental indicators among others, all serve to help delineate areas more favorable for uranium- and thorium-bearing pegmatites. The most useful guide remains the radioactivity exhibited by uranium- and thorium-bearing pegmatites. Although pegmatites are frequently noted as favorable hosts for radioactive minerals, the general paucity and sporadic distribution of these minerals and inherent mining and milling difficulties negate the resource potential of pegmatites for uranium and thorium.

Adams, J.W.; Arengi, J.T.; Parrish, I.S.

1980-04-01T23:59:59.000Z

489

Bear Valley Springs, 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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of InspectorConcentrating SolarElectricEnergyCTBarre Biomass Facility Jump to:SectorBear

490

Sodium-Bearing Waste Treatment, Applied Technology Plan  

SciTech Connect (OSTI)

Settlement Agreement between the Department of Energy and the State of Idaho mandates treatment of sodium-bearing waste at the Idaho Nuclear Technology and Engineering Center within the Idaho National Engineering and Environmental Laboratory. One of the requirements of the Settlement Agreement is to complete treatment of sodium-bearing waste by December 31, 2012. Applied technology activities are required to provide the data necessary to complete conceptual design of four identified alternative processes and to select the preferred alternative. To provide a technically defensible path forward for the selection of a treatment process and for the collection of needed data, an applied technology plan is required. This document presents that plan, identifying key elements of the decision process and the steps necessary to obtain the required data in support of both the decision and the conceptual design. The Sodium-Bearing Waste Treatment Applied Technology Plan has been prepared to provide a description/roadmap of the treatment alternative selection process. The plan details the results of risk analyzes and the resulting prioritized uncertainties. It presents a high-level flow diagram governing the technology decision process, as well as detailed roadmaps for each technology. The roadmaps describe the technical steps necessary in obtaining data to quantify and reduce the technical uncertainties associated with each alternative treatment process. This plan also describes the final products that will be delivered to the Department of Energy Idaho Operations Office in support of the office's selection of the final treatment technology.

Lance Lauerhass; Vince C. Maio; S. Kenneth Merrill; Arlin L. Olson; Keith J. Perry

2003-06-01T23:59:59.000Z

491

Disturbance Rejection Control of an Electromagnetic Bearing Spindle  

SciTech Connect (OSTI)

The force exerted on the rotor by an active magnetic bearing (AMB) is determined by the current flow in the magnet coils. This force can be controlled very precisely, making magnetic bearings a potential benefit for grinding, where cutting forces act as external disturbances on the shaft, resulting in degraded part finish. It is possible to achieve precise shaft positioning, reduce vibration of the shaft caused by external disturbances, and even damp out resonant modes. Adaptive control is an appealing approach for these systems because the controller can tune itself to account for an unknown periodic disturbance, such as cutting or grinding forces, injected into the system. In this paper the authors show how one adaptive control algorithm can be applied to an AMB system with a periodic disturbance applied to the rotor. An adaptive algorithm was developed and implemented in both simulation and hardware, yielding significant reductions in rotor displacement in the presence of an external excitation. Ultimately, this type of algorithm could be applied to a magnetic bearing grinder to reduce unwanted motion of the spindle which leads to poor part finish and chatter.

PETTEYS,REBECCA; PARKER,GORDON

2000-08-31T23:59:59.000Z

492

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

SciTech Connect (OSTI)

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.

Assoufid, L.; Khounsary, A.M.

1996-01-01T23:59:59.000Z

493

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

SciTech Connect (OSTI)

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.

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

494

High-Speed Shaft Bearing Loads Testing and Modeling in the NREL Gearbox Reliability Collaborative: Preprint  

SciTech Connect (OSTI)

Bearing failures in the high speed output stage of the gearbox are plaguing the wind turbine industry. Accordingly, the National Renewable Energy Laboratory (NREL) Gearbox Reliability Collaborative (GRC) has performed an experimental and theoretical investigation of loads within these bearings. The purpose of this paper is to describe the instrumentation, calibrations, data post-processing and initial results from this testing and modeling effort. Measured HSS torque, bending, and bearing loads are related to model predictions. Of additional interest is examining if the shaft measurements can be simply related to bearing load measurements, eliminating the need for invasive modifications of the bearing races for such instrumentation.

McNiff, B.; Guo, Y.; Keller, J.; Sethuraman, L.

2014-12-01T23:59:59.000Z

495

Diamond X-ray photodiode for white and monochromatic SR beams  

SciTech Connect (OSTI)

High-purity, single-crystal CVD diamond plates are screened for quality and instrumented into a sensor assembly for quantitative characterization of flux and position sensitivity. Initial investigations have yielded encouraging results and have led to further development. Several limiting complications are observed and discussed, as well as mitigations thereof. For example, diamond quality requirements for X-ray diodes include low nitrogen impurity and crystallographic defectivity. Thin electrode windows and electronic readout performance are ultimately also critical to device performance. Promising features observed so far from prototype devices include calculable responsivity, flux linearity, position sensitivity and timing performance. Recent results from testing in high-flux and high-speed applications are described.

Keister, J.W.; Heroux, A.; Smedley, J.; Muller, E. M.; Bohon, J.

2011-09-01T23:59:59.000Z

496

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

SciTech Connect (OSTI)

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}.

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

497

Electroless vs electrodeposited Ni-P alloys for diamond turning applications  

SciTech Connect (OSTI)

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.

Dini, J.W.

1991-07-01T23:59:59.000Z

498

Performance of a beam-multiplexing diamond crystal monochromator at the Linac Coherent Light Source  

SciTech Connect (OSTI)

A double-crystal diamond monochromator was recently implemented at the Linac Coherent Light Source. It enables splitting pulses generated by the free electron laser in the hard x-ray regime and thus allows the simultaneous operations of two instruments. Both monochromator crystals are High-Pressure High-Temperature grown type-IIa diamond crystal plates with the (111) orientation. The first crystal has a thickness of ?100 ?m to allow high reflectivity within the Bragg bandwidth and good transmission for the other wavelengths for downstream use. The second crystal is about 300 ?m thick and makes the exit beam of the monochromator parallel to the incoming beam with an offset of 600 mm. Here we present details on the monochromator design and its performance.

Zhu, Diling, E-mail: dlzhu@slac.stanford.edu; Feng, Yiping; Lemke, Henrik T.; Fritz, David M.; Chollet, Matthieu; Glownia, J. M.; Alonso-Mori, Roberto; Sikorski, Marcin; Song, Sanghoon; Williams, Garth J.; Messerschmidt, Marc; Boutet, Sébastien; Robert, Aymeric [Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Stoupin, Stanislav; Shvyd'ko, Yuri V. [Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439 (United States); Terentyev, Sergey A.; Blank, Vladimir D. [Technological Institute of Superhard and Novel Carbon Materials, Tsentralnaya str. 7a, Troitsk, Moscow 142190 (Russian Federation); Driel, Tim B. van [Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Center for Molecular Movies, Department of Physics, Technical University of Denmark, DK-2800 Lyngby (Denmark)

2014-06-15T23:59:59.000Z

499

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

SciTech Connect (OSTI)

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.

?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

500

Fluorinated diamond thin films for tribological applications. Final report, April-October 1989  

SciTech Connect (OSTI)

Diamond (100) substrates have been fluorinated with both atomic and molecular fluorine under ultrahigh vacuum conditions using molecular beams. X-ray photoelectron spectra of the resulting samples indicate that atomic fluorine, F, reacts with an initial accommodation coefficient of 0.25 (+ or - 0.1) at 298 K; a saturation coverage of about three quarters of a monolayer is obtained. The carbon fluoride adlayer is thermally stable to 700 K, but slowly desorbs at temperatures above this. In contrast, molecular fluorine, F2, reacts quite slowly; a saturation coverage of less than one fifth of a monolayer after several hundred monolayers exposure to F2 at temperatures from 300 K to 700 K is achieved. In addition, diamond substrates saturated with fluorine atoms showed no loss of fluorine after exposure to beams of H2 and O2 at temperatures between 300 K and 700 K.

Freedman, A.; Stinespring, C.

1990-01-04T23:59:59.000Z