Sample records for modes mode fraction

  1. Energy-dependence of skin-mode fraction in $E1$ excitations of neutron-rich nuclei

    E-Print Network [OSTI]

    Nakada, H; Sawai, H

    2015-01-01T23:59:59.000Z

    We have extensively investigated characters of the low-energy $E1$ strengths in $N>Z$ nuclei, by analyzing the transition densities obtained by the HF+RPA calculations with several effective interactions. Crossover behavior has been confirmed, from the skin mode at low energy to the $pn$ mode at higher energy. Decomposing the $E1$ strengths into the skin-mode, $pn$-mode and interference fractions, we show that the ratio of the skin-mode strength to the full strength may be regarded as a generic function of the excitation energy, insensitive to nuclides and effective interactions, particularly beyond Ni.

  2. Observation of neutral modes in the fractional quantum Hall regime , H. Inoue1

    E-Print Network [OSTI]

    Kane, Charles

    -dimensional-electron gas under strong magnetic field, currents flow along the edges of the sample. For some particle, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel 2 Department (FQHE) [1] regime along the edges of a two-dimensional- electron gas (2DEG) via edge modes

  3. List mode multichannel analyzer

    DOE Patents [OSTI]

    Archer, Daniel E. (Livermore, CA); Luke, S. John (Pleasanton, CA); Mauger, G. Joseph (Livermore, CA); Riot, Vincent J. (Berkeley, CA); Knapp, David A. (Livermore, CA)

    2007-08-07T23:59:59.000Z

    A digital list mode multichannel analyzer (MCA) built around a programmable FPGA device for onboard data analysis and on-the-fly modification of system detection/operating parameters, and capable of collecting and processing data in very small time bins (<1 millisecond) when used in histogramming mode, or in list mode as a list mode MCA.

  4. Kink modes in pedestal

    SciTech Connect (OSTI)

    Wang, Z. T. [Southwestern Institute of Physics, Chengdu 610041 (China) [Southwestern Institute of Physics, Chengdu 610041 (China); College of Physics Science and Technology, Sichuan University, Chengdu 610065 (China); He, Z. X.; Dong, J. Q.; Wang, Z. H.; Xu, M. [Southwestern Institute of Physics, Chengdu 610041 (China)] [Southwestern Institute of Physics, Chengdu 610041 (China); Xu, X. L.; Mou, M. L.; Sun, T. T.; Huang, J.; Chen, S. Y.; Tang, C. J. [College of Physics Science and Technology, Sichuan University, Chengdu 610065 (China)] [College of Physics Science and Technology, Sichuan University, Chengdu 610065 (China)

    2014-03-15T23:59:59.000Z

    Kink modes are investigated in pedestal for shaped tokamaks. An analytic combining criterion is presented. It lies on the middle of the sufficient criterion of Lortz and necessary criterion of Mercier giving a more restricted necessary criterion. Growth rates and mode structure are calculated. For large poloidal mode number, the modes are highly localized in both poloidal and radial directions. The modes increase rapidly when they approach to the resonant surface. They are typical of edge localized modes (ELMs). It is assumed that the modes vanish inside the next resonant surface, then, there seems to be a second stable region. Several mitigation methods for controlling ELMs are proposed.

  5. Measurements of $\\Lambda^+_c$ Branching Fractions of Cabibbo-Suppressed Decay Modes involving $\\Lambda$ and $\\Sigma^{0}$

    E-Print Network [OSTI]

    Aubert, B; Abrams, G S; Adye, T; Ahmed, M; Ahmed, S; Alam, M S; Albert, J; Aleksan, Roy; Allen, M T; Allison, J; Allmendinger, T; Altenburg, D; Andreassen, R; Andreotti, M; Angelini, C; Anulli, F; Arnaud, N; Aston, D; Azzolini, V; Baak, M; Back, J J; Baldini-Ferroli, R; Band, H R; Banerjee, S; Barate, R; Bard, D J; Barlow, N R; Barlow, R J; Barrett, M; Bartoldus, R; Batignani, G; Battaglia, M; Bauer, J M; Beck, T W; Behera, P K; Bellini, F; Benayoun, M; Benelli, G; Berger, N; Bernard, D; Berryhill, J W; Best, D; Bettarini, S; Bettoni, D; Bevan, A J; Bhimji, W; Bhuyan, B; Bianchi, F; Biasini, M; Biesiada, J; Blanc, F; Blaylock, G; Blinov, A E; Blinov, V E; Bloom, P C; Blount, N L; Bomben, M; Bondioli, M; Bonneaud, G R; Bosisio, L; Boutigny, D; Bowerman, D A; Boyarski, A M; Boyd, J T; Bozzi, C; Brandenburg, G; Brandt, T; Brau, J E; Breon, A B; Brose, J; Brown, C L; Brown, C M; Brown, D N; Bruinsma, M; Brunet, S; Bucci, F; Buchanan, C; Buchmüller, O L; Bugg, W; Bukin, A D; Bula, R; Bulten, H; Burchat, P R; Burke, J P; Button-Shafer, J; Buzzo, A; Bóna, M; Cahn, R N; Calabrese, R; Calcaterra, A; Calderini, G; Campagnari, C; Capra, R; Carpinelli, M; Cartaro, C; Cavallo, N; Cavoto, G; Cenci, R; Chai, X; Chaisanguanthum, K S; Chao, M; Charles, E; Charles, M J; Chauveau, J; Chavez, C A; Chen, A; Chen, C; Chen, E; Chen, J C; Chen, S; Chen, X; Cheng, B; Cheng, C H; Chia, Y M; Cibinetto, G; Clark, P J; Claus, R; Cochran, J; Coleman, J P; Contri, R; Convery, M R; Cossutti, F; Cottingham, W N; Couderc, F; Covarelli, R; Cowan, G; Cowan, R; Crawley, H B; Cremaldi, L; Cristinziani, M; Cunha, A; Curry, S; Côté, D; D'Orazio, A; Dahmes, B; Dallapiccola, C; Danielson, N; Dasu, S; Datta, M; Dauncey, P D; David, P; Davier, M; Davis, C L; Day, C T; De Groot, N; De Nardo, Gallieno; De Sangro, R; Del Buono, L; Del Re, D; Della Ricca, G; Di Lodovico, F; Di Marco, E; Dickopp, M; Dingfelder, J C; Dittongo, S; Dong, D; Dong, L; Dorfan, J; Druzhinin, V P; Dubitzky, R S; Dubois-Felsmann, G P; Dujmic, D; Dunwoodie, W M; Dvoretskii, A; Eckhart, E A; Eckmann, R; Edgar, C L; Edwards, A J; Egede, U; Eichenbaum, A M; Eigen, G; Eisner, A M; Elmer, P; Emery, S; Ernst, J A; Eschenburg, V; Eschrich, I; Eyges, V; Fabozzi, F; Faccini, R; Fan, S; Feltresi, E; Ferrarotto, F; Ferroni, F; Field, R C; Finocchiaro, G; Flacco, C J; Flack, R L; Flächer, H U; Flood, K T; Ford, K E; Ford, W T; Forster, I J; Forti, F; Fortin, D; Foulkes, S D; Franek, B; Frey, R; Fritsch, M; Fry, J R; Fulsom, B G; Gabathuler, E; Gaidot, A; Gaillard, J R; Galeazzi, F; Gallo, F; Gamba, D; Gamet, R; Gan, K K; Ganzhur, S F; Gary, J W; Gaspero, M; Gatto, C; George, K A; Gill, M S; Giorgi, M A; Giroux, X; Gladney, L; Glanzman, T; Godang, R; Goetzen, K; Golubev, V B; Gopal, G P; Gowdy, S J; Gradl, W; Graham, M T; Grancagnolo, S; Graugès-Pous, E; Graziani, G; Green, M G; Grenier, P; Gritsan, A V; Grosdidier, G; Groysman, Y; Guo, Q H; Hadavand, H K; Hadig, T; Haire, M; Halyo, V; Hamano, K; Hamel de Monchenault, G; Hamon, O; Harrison, P F; Harrison, T J; Hart, A J; Hartfiel, B L; Hast, C; Hauke, A; Hawkes, C M; Hearty, C; Held, T; Hertzbach, S S; Heusch, C A; Hill, E J; Hirschauer, J F; Hitlin, D G; Hodgkinson, M C; Hollar, J J; Hong, T M; Honscheid, K; Hopkins, D A; Hrynóva, T; Hufnagel, D; Hulsbergen, W D; Hutchcroft, D E; Höcker, A; Igonkina, O; Innes, W R; Izen, J M; Jackson, P D; Jackson, P S; Jacobsen, R G; Jawahery, A; Jessop, C P; John, M J J; Johnson, J R; Judd, D; Kadel, R W; Kadyk, J; Kagan, H; Karyotakis, Yu; Kass, R; Kelly, M P; Kelsey, M H; Kerth, L T; Khan, A; Kim, H; Kim, P; Kirkby, D; Kitayama, I; Klose, V; Knecht, N S; Koch, H; Kocian, M L; Koeneke, K; Kofler, R; Kolomensky, Yu G; Kovalskyi, D; Kowalewski, R V; Kozanecki, Witold; Kravchenko, E A; Kreisel, A; Krishnamurthy, M; Kroeger, R; Kroseberg, J; Kukartsev, G; Kutter, P E; Kyberd, P; La Vaissière, C de; Lacker, H M; Lae, C K; Lafferty, G D; Lanceri, L; Lange, D J; Langenegger, U; Lankford, A J; Latham, T E; Latour, E; Lau, Y P; Lazzaro, A; Le Diberder, F R; Lees, J P; Legendre, M; Leith, D W G S; Lepeltier, V; Leruste, P; Lewandowski, B; Li Gioi, L; Li, H; Li, X; Libby, J; Lista, L; Liu, R; Lo Vetere, M; LoSecco, J M; Lockman, W S; Lombardo, V; London, G W; Long, O; Lou, X C; Lu, M; Luitz, S; Lund, P; Luppi, E; Lusiani, A; Lutz, A M; Lynch, G; Lynch, H L; Lü, C; Lüth, V; MacFarlane, D B; Macri, M M; Mader, W F; Majewski, S A; Malcles, J; Mallik, U; Mancinelli, G; Mandelkern, M A; Marchiori, G; Margoni, M; Marks, J; Marsiske, H; Martínez-Vidal, F; Mattison, T S; Mayer, B; Mazur, M A; Mazzoni, M A; McKenna, J A; McMahon, T R; Meadows, B T; Mellado, B; Menges, W; Messner, R; Meyer, W T; Mihályi, A; Minamora, J S; Mir, L M; Mohanty, G B; Mohapatra, A K; Mommsen, R K; Monge, M R; Monorchio, D; Moore, T B; Morandin, M; Morgan, S E; Morganti, M; Morganti, S; Morii, M; Muheim, F

    2007-01-01T23:59:59.000Z

    We measure the branching ratios of the Cabibbo-suppressed decays $\\Lambda^+_c$ $\\to$ $\\Lambda$ $K^+$ and $\\Lambda^+_c$ $\\to$ $\\Sigma^{0}$ $K^+$ %(measured with improved accuracy). relative to the Cabibbo-favored decay modes $\\Lambda^+_c$ $\\to$ $\\Lambda$ $\\pi^+$ and $\\Lambda^+_c$ $\\to$ $\\Sigma^{0}$ $\\pi^+$ to be $ 0.044 \\pm 0.004 ~(\\textnormal{stat.})~ \\pm ~0.003 \\~(\\textnormal{syst.})$ and $ 0.039~ \\pm ~0.005 ~(\\textnormal{stat.})~ \\pm \\~0.003 ~(\\textnormal{syst.})$, respectively. We set an upper limit on the branching ratio at 90 % confidence level for $\\Lambda^+_c$ $\\to$ $\\Lambda$ $K^+ \\pi^+ \\pi^-$ to be $ 4.1 \\times ~10^{-2}$ relative to $\\Lambda^+_c$ $\\to$ $\\Lambda$ $\\pi^+$ and for $\\Lambda^+_c$ $\\to$ $\\Sigma^{0}$ $K^+ \\pi^+ \\pi^-$ to be $ 2.0 \\times ~10^{-2}$ relative to $\\Lambda^+_c$ $\\to$ $\\Sigma^{0}$ $\\pi^+$. We also measure the branching fraction for the Cabibbo-favored mode $\\Lambda^+_c$ $\\to$ $\\Sigma^{0}$ $\\pi^+$ relative to $\\Lambda^+_c$ $\\to$ $\\Lambda$ $\\pi^+$ to be $0.977~ \\pm ~0.015 ~(\\textnorm...

  6. Modes of log gravity

    SciTech Connect (OSTI)

    Bergshoeff, Eric A.; Rosseel, Jan [Centre for Theoretical Physics, University of Groningen, Nijenborgh 4, 9747 AG Groningen (Netherlands); Hohm, Olaf [Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Townsend, Paul K. [Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA (United Kingdom)

    2011-05-15T23:59:59.000Z

    The physical modes of a recently proposed D-dimensional 'critical gravity', linearized about its anti-de Sitter vacuum, are investigated. All 'log mode' solutions, which we categorize as 'spin-2' or 'Proca', arise as limits of the massive spin-2 modes of the noncritical theory. The linearized Einstein tensor of a spin-2 log mode is itself a 'nongauge' solution of the linearized Einstein equations whereas the linearized Einstein tensor of a Proca mode takes the form of a linearized general coordinate transformation. Our results suggest the existence of a holographically dual logarithmic conformal field theory.

  7. Architecture AddressingModes

    E-Print Network [OSTI]

    Nguyen, Dat H.

    MIPS R2000 Architecture and Assembly (Part 1) 1. CPU Registers 2. Byte Order 3. AddressingModes 4­endian byte order 3 2 1 0 0 1 2 3 Or Byte number #12; AddressingModes . MIPS is a load/store architecture . RICS -- Load/Store architecture -- All instructions have equal length of 4 bytes -- Every register can

  8. Zero-mode waveguides

    DOE Patents [OSTI]

    Levene, Michael J.; Korlach, Jonas; Turner, Stephen W.; Craighead, Harold G.; Webb, Watt W.

    2007-02-20T23:59:59.000Z

    The present invention is directed to a method and an apparatus for analysis of an analyte. The method involves providing a zero-mode waveguide which includes a cladding surrounding a core where the cladding is configured to preclude propagation of electromagnetic energy of a frequency less than a cutoff frequency longitudinally through the core of the zero-mode waveguide. The analyte is positioned in the core of the zero-mode waveguide and is then subjected, in the core of the zero-mode waveguide, to activating electromagnetic radiation of a frequency less than the cut-off frequency under conditions effective to permit analysis of the analyte in an effective observation volume which is more compact than if the analysis were carried out in the absence of the zero-mode waveguide.

  9. The electron geodesic acoustic mode

    SciTech Connect (OSTI)

    Chakrabarti, N. [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta 700 064 (India); Guzdar, P. N. [Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742 (United States); Kaw, P. K. [Institute for Plasma Research Bhat, Gandhinagar 382428 (India)

    2012-09-15T23:59:59.000Z

    In this report, a novel new mode, named the electron geodesic acoustic mode, is presented. This mode can occur in toroidal plasmas like the conventional geodesic acoustic mode (GAM). The frequency of this new mode is much larger than that of the conventional GAM by a factor equal to the square root of the ion to electron mass ratio.

  10. Elemental Modes of Occurrence in an Illinois #6 Coal and Fractions Prepared by Physical Separation Techniques at a Coal Preparation Plant

    SciTech Connect (OSTI)

    Huggins, F.; Seidu, L; Shah, N; Huffman, G; Honaker, R; Kyger, J; Higgins, B; Robertson, J; Pal, S; Seehra, M

    2009-01-01T23:59:59.000Z

    In order to gain better insight into elemental partitioning between clean coal and tailings, modes of occurrence have been determined for a number of major and trace elements (S, K, Ca, V, Cr, Mn, Fe, Zn, As, Se, Pb) in an Illinois No.6 coal and fractions prepared by physical separation methods at a commercial coal preparation plant. Elemental modes of occurrence were largely determined directly by XAFS or Moessbauer spectroscopic methods because the concentrations of major minerals and wt.% ash were found to be highly correlated for this coal and derived fractions, rendering correlations between individual elements and minerals ambiguous for inferring elemental modes of occurrence. Of the major elements investigated, iron and potassium are shown to be entirely inorganic in occurrence. Most (90%) of the iron is present as pyrite, with minor fractions in the form of clays and sulfates. All potassium is present in illitic clays. Calcium in the original coal is 80-90% inorganic and is divided between calcite, gypsum, and illite, with the remainder of the calcium present as carboxyl-bound calcium. In the clean coal fraction, organically associated Ca exceeds 50% of the total calcium. This organically-associated form of Ca explains the poorer separation of Ca relative to both K and ash. Among the trace elements, V and Cr are predominantly inorganically associated with illite, but minor amounts (5-15% Cr, 20-30% V) of these elements are also organically associated. Estimates of the V and Cr contents of illite are 420 ppm and 630 ppm, respectively, whereas these elements average 20 and 8 ppm in the macerals. Arsenic in the coal is almost entirely associated with pyrite, with an average As content of about 150 ppm, but some As ({approx} 10%) is present as arsenate due to minor oxidation of the pyrite. The mode of occurrence of Zn, although entirely inorganic, is more complex than normally noted for Illinois basin coals; about 2/3 is present in sphalerite, with lesser amounts associated with illite and a third form yet to be conclusively identified. The non-sulfide zinc forms are removed predominantly by the first stage of separation (rotary breaker), whereas the sphalerite is removed by the second stage (heavy media). Germanium is the only trace element determined to have a predominantly organic association.

  11. acoustic mode frequencies: Topics by E-print Network

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

    simulations were then compared to the number of p-modes candidates observed in real Sun-as-a-star data at low frequencies. The fraction of simulated spectra in which modes...

  12. Slow modes in Keplerian disks

    E-Print Network [OSTI]

    Scott Tremaine

    2000-11-30T23:59:59.000Z

    Low-mass disks orbiting a massive body can support "slow" normal modes, in which the eigenfrequency is much less than the orbital frequency. Slow modes are lopsided, i.e., the azimuthal wavenumber m=1. We investigate the properties of slow modes, using softened self-gravity as a simple model for collective effects in the disk. We employ both the WKB approximation and numerical solutions of the linear eigenvalue equation. We find that all slow modes are stable. Discrete slow modes can be divided into two types, which we label g-modes and p-modes. The g-modes involve long leading and long trailing waves, have properties determined by the self-gravity of the disk, and are only present in narrow rings or in disks where the precession rate is dominated by an external potential. In contrast, the properties of p-modes are determined by the interplay of self-gravity and other collective effects. P-modes involve both long and short waves, and in the WKB approximation appear in degenerate leading/trailing pairs. Disks support a finite number---sometimes zero---of discrete slow modes, and a continuum of singular modes.

  13. Sandia National Laboratories: MODE

    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 -theErik Spoerke SSLS ExhibitIowaLos Alamos NationalMHK FloatingMLPE SandiaMODE

  14. Electron geodesic acoustic modes in electron temperature gradient mode turbulence

    SciTech Connect (OSTI)

    Anderson, Johan; Nordman, Hans [Department of Earth and Space Sciences, Chalmers University of Technology, SE-412 96 Goeteborg (Sweden); Singh, Raghvendra; Kaw, Predhiman [Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428 (India)

    2012-08-15T23:59:59.000Z

    In this work, the first demonstration of an electron branch of the geodesic acoustic mode (el-GAM) driven by electron temperature gradient (ETG) modes is presented. The work is based on a fluid description of the ETG mode retaining non-adiabatic ions and the dispersion relation for el-GAMs driven nonlinearly by ETG modes is derived. A new saturation mechanism for ETG turbulence through the interaction with el-GAMs is found, resulting in a significantly enhanced ETG turbulence saturation level compared to the mixing length estimate.

  15. Mode Order Converter Using Tapered Multi-mode Interference Couplers

    E-Print Network [OSTI]

    Texas at Austin, University of

    , and modes of guided light is essential for flexibility in photonic integrated circuit (PIC) design.3120) Integrated optics devices; (130.2790) Guided waves 1. Introduction Accommodating various sizes, shapes indices. One can define Am0 as the transmission of the fundamental mode in the output guide when exciting

  16. Hawking radiation and Quasinormal modes

    E-Print Network [OSTI]

    SangChul Yoon

    2005-10-05T23:59:59.000Z

    The spectrum of Hawking radiation by quantum fields in the curved spacetime is continuous, so the explanation of Hawking radiation using quasinormal modes can be suspected to be impossible. We find that quasinormal modes do not explain the relation between the state observed in a region far away from a black hole and the short distance behavior of the state on the horizon.

  17. Mediating Religion: Modes of Communication

    E-Print Network [OSTI]

    Indiana University

    Mediating Religion: Modes of Communication in Religious Contexts Keynote: Dr. Lerone Martin, particularly given recent innovations in mass media and digital communications technologies. Turning attention to modes of communication in religious contexts, this conference will address ways in which mass media have

  18. Mode synthesizing atomic force microscopy and mode-synthesizing sensing

    DOE Patents [OSTI]

    Passian, Ali; Thundat, Thomas George; Tetard, Laurene

    2013-05-17T23:59:59.000Z

    A method of analyzing a sample that includes applying a first set of energies at a first set of frequencies to a sample and applying, simultaneously with the applying the first set of energies, a second set of energies at a second set of frequencies, wherein the first set of energies and the second set of energies form a multi-mode coupling. The method further includes detecting an effect of the multi-mode coupling.

  19. Peeling mode relaxation ELM model

    SciTech Connect (OSTI)

    Gimblett, C. G. [EURATOM/UKAEA Fusion Association, Culham Science Centre Abingdon, Oxon, OX14 3DB (United Kingdom)

    2006-11-30T23:59:59.000Z

    This paper discusses an approach to modelling Edge Localised Modes (ELMs) in which toroidal peeling modes are envisaged to initiate a constrained relaxation of the tokamak outer region plasma. Relaxation produces both a flattened edge current profile (which tends to further destabilise a peeling mode), and a plasma-vacuum negative current sheet which has a counteracting stabilising influence; the balance that is struck between these two effects determines the radial extent (rE) of the ELM relaxed region. The model is sensitive to the precise position of the mode rational surfaces to the plasma surface and hence there is a 'deterministic scatter' in the results that has an accord with experimental data. The toroidal peeling stability criterion involves the edge pressure, and using this in conjunction with predictions of rE allows us to evaluate the ELM energy losses and compare with experiment. Predictions of trends with the edge safety factor and collisionality are also made.

  20. Existence of Metastable Kinetic Modes

    SciTech Connect (OSTI)

    Nguyen, C.; Luetjens, H.; Garbet, X.; Grandgirard, V.; Lesur, M. [Centre de Physique Theorique, CNRS-Ecole Polytechnique, Palaiseau (France); CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France); JAEA, Higashi-Ueno 6-9-3, Taitou, Tokyo, 110-0015 (Japan)

    2010-11-12T23:59:59.000Z

    The nonlinear evolution of resonantly driven systems, such as suprathermal particle driven modes in magnetically confined plasmas, is shown to strongly depend on the existence and nature of an underlying damping mechanism. When background resonant damping is present, subcritical states can take place. In particular, purely nonlinear steady-state regimes are found, whose destabilization threshold and saturation levels are calculated and validated using numerical simulations. This nonlinear behavior can be of relevance for acoustic modes in magnetically confined plasmas.

  1. Observation of pedestal turbulence in edge localized mode-free H-mode on experimental advanced superconducting tokamak

    SciTech Connect (OSTI)

    Han, X., E-mail: hanx@ipp.ac.cn; Zhang, T.; Zhang, S. B.; Wang, Y. M.; Shi, T. H.; Liu, Z. X.; Kong, D. F.; Qu, H.; Gao, X. [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031 (China)

    2014-10-15T23:59:59.000Z

    Two different pedestal turbulence structures have been observed in edge localized mode-free phase of H-mode heated by lower hybrid wave and RF wave in ion cyclotron range of frequencies (ICRF) on experimental advanced superconducting tokamak. When the fraction of ICRF power P{sub ICRF}/P{sub total} exceeds 0.7, coherent mode is observed. The mode is identified as an electromagnetic mode, rotating in electron diamagnetic direction with a frequency around 50 kHz and toroidal mode number n?=??3. Whereas when P{sub ICRF}/P{sub total} is less than 0.7, harmonic mode with frequency f?=?40–300 kHz appears instead. The characteristics of these two modes are demonstrated preliminarily. The threshold value of heating power and also the plasma parameters are distinct.

  2. Occupant satisfaction in mixed-mode buildings.

    E-Print Network [OSTI]

    Brager, Gail; Baker, Lindsay

    2008-01-01T23:59:59.000Z

    Strategies for Mixed-Mode Buildings, Summary Report, CenterCBE). 2006. Website: Mixed-Mode Building Case Studies.Department of Environmental Building Research Establishment

  3. Occupant satisfaction in mixed-mode buildings

    E-Print Network [OSTI]

    Brager, Gail; Baker, Lindsay

    2009-01-01T23:59:59.000Z

    Environmental Quality in Green Buildings”. Indoor Air; 14 (Strategies for Mixed-Mode Buildings, Summary Report, CenterCBE). 2006. Website: Mixed-Mode Building Case Studies.

  4. Tensor modes on the string theory landscape

    E-Print Network [OSTI]

    Alexander Westphal

    2012-12-22T23:59:59.000Z

    We attempt an estimate for the distribution of the tensor mode fraction $r$ over the landscape of vacua in string theory. The dynamics of eternal inflation and quantum tunneling lead to a kind of democracy on the landscape, providing no bias towards large-field or small-field inflation regardless of the class of measure. The tensor mode fraction then follows the number frequency distributions of inflationary mechanisms of string theory over the landscape. We show that an estimate of the relative number frequencies for small-field vs large-field inflation, while unattainable on the whole landscape, may be within reach as a regional answer for warped Calabi-Yau flux compactifications of type IIB string theory.

  5. Properties of solar gravity mode signals in total irradiance observations

    SciTech Connect (OSTI)

    Kroll, R.J.; Chen, J.; Hill, H.A.

    1988-01-01T23:59:59.000Z

    Further evidence has been found that a significant fraction of the gravity mode power density in the total irradiance observations appears in sidebands of classified eigenfrequencies. These sidebands whose amplitudes vary from year to year are interpreted as harmonics of the rotational frequencies of the nonuniform solar surface. These findings are for non axisymmetric modes and corroborate the findings of Kroll, Hill and Chen for axisymmetric modes. It is demonstrated the the generation of the sidebands lifts the usual restriction on the parity of the eigenfunctions for modes detectable in total irradiance observations. 14 refs.

  6. Vibrational Modes of Adsorbed Atoms

    E-Print Network [OSTI]

    LAWRENCE, WR; Allen, Roland E.

    1977-01-01T23:59:59.000Z

    , because the interaction. a d t ion is weak corn pared to the Ne-A , n the 11. and ].~m ' w e 1V mode. modes lie below the In comparisons with the mass-def y eing a measure of the mass divided C. Ne on Kr The three" rin"p incipal surface mod... represe~t~~g lo or izontal" polari- 0 P) 0 CU 0 2v 1H 1L 4H e - XENON FIG. 1. Dimens' are ni nsionless f nine substrate requency (d* o- ' 'o a layers b vs two- d b 1 I" ng y try ' o He on Xe. There 15 5081 5082 R LA%REN C E AND R . E...

  7. Quantum simulation of Dirac fermion mode, Majorana fermion mode and Majorana-Weyl fermion mode in cavity QED lattice

    E-Print Network [OSTI]

    Sujit Sarkar

    2014-09-11T23:59:59.000Z

    Quantum simulation aims to simulate a quantum system using a controble laboratory system that underline the same mathematical model. Cavity QED lattice system is that prescribe system to simulate the relativistic quantum effect. We quantum simulate the Dirac fermion mode, Majorana fermion mode and Majorana-Weyl fermion mode and a crossover between them in cavity QED lattice. We also present the different analytical relations between the field operators for different mode excitations.

  8. Optical waveguides having flattened high order modes

    DOE Patents [OSTI]

    Messerly, Michael Joseph; Beach, Raymond John; Heebner, John Edward; Dawson, Jay Walter; Pax, Paul Henry

    2014-08-05T23:59:59.000Z

    A deterministic methodology is provided for designing optical fibers that support field-flattened, ring-like higher order modes. The effective and group indices of its modes can be tuned by adjusting the widths of the guide's field-flattened layers or the average index of certain groups of layers. The approach outlined here provides a path to designing fibers that simultaneously have large mode areas and large separations between the propagation constants of its modes.

  9. Broadband frequency mode entanglement in waveguided PDC

    E-Print Network [OSTI]

    Andreas Eckstein; Christine Silberhorn

    2008-07-04T23:59:59.000Z

    We report the observation of beatings of the coincidence event rate in a Hong-Ou-Mandel interference (HOMI) between signal and idler photons from a parametric downconversion (PDC) process inside a multi-mode KTP waveguide. As explanation we introduce bi-photonic states entangled in their broadband frequency modes generated by waveguide mode triples and propose a suitable entanglement detection scheme.

  10. Excitation of Kaluza-Klein gravitational mode

    E-Print Network [OSTI]

    Kunihito Uzawa; Yoshiyuki Morisawa; Shinji Mukohyama

    2000-04-10T23:59:59.000Z

    We investigate excitation of Kaluza-Klein modes due to the parametric resonance caused by oscillation of radius of compactification. We consider a gravitational perturbation around a D-dimensional spacetime, which we compactify on a (D-4)-sphere to obtain a 4-dimensional theory. The perturbation includes the so-called Kaluza-Klein modes, which are massive in 4-dimension, as well as zero modes, which is massless in 4-dimension. These modes appear as scalar, vector and second-rank symmetric tensor fields in the 4-dimensional theory. Since Kaluza-Klein modes are troublesome in cosmology, quanta of these Kaluza-Klein modes should not be excited abundantly. However, if radius of compactification oscillates, then masses of Kaluza-Klein modes also oscillate and, thus, parametric resonance of Kaluza-Klein modes may occur to excite their quanta. In this paper we consider part of Kaluza-Klein modes which correspond to massive scalar fields in 4-dimension and investigate whether quanta of these modes are excited or not in the so called narrow resonance regime of the parametric resonance. We conclude that at least in the narrow resonance regime quanta of these modes are not excited so catastrophically.

  11. Reliability Failure Mode, Effects, and Criticality Analysis

    E-Print Network [OSTI]

    Rathbun, Julie A.

    Reliability Failure Mode, Effects, and Criticality Analysis Addendum 1; HFE ~ ATM501 PAGE I I. Hiebert Reliability Engineer HFE · B-1 f #12;~~.~-~ -_ ~ ~ Reliability Failure Mode, Effects were slight adjustment in the linearizing resistors. The reliability is effected upward by the deletion

  12. Normalizable fermion modes in a holographic superconductor

    E-Print Network [OSTI]

    Steven S. Gubser; Fabio D. Rocha; Pedro Talavera

    2009-11-18T23:59:59.000Z

    We consider fermions in a zero-temperature superconducting anti-de Sitter domain wall solution and find continuous bands of normal modes. These bands can be either partially filled or totally empty and gapped. We present a semi-classical argument which approximately captures the main features of the normal mode spectrum.

  13. Broadband frequency mode entanglement in waveguided PDC

    E-Print Network [OSTI]

    Eckstein, Andreas

    2008-01-01T23:59:59.000Z

    We report the observation of beatings of the coincidence event rate in a Hong-Ou-Mandel interference (HOMI) between signal and idler photons from a parametric downconversion process inside a multi-mode KTP waveguide. As explanation we introduce bi-photonic states entangled in their broadband frequency modes and propose a suitable entanglement witness.

  14. Nonclassicality in two-mode BEC

    E-Print Network [OSTI]

    Sandip Kumar Giri; Biswajit Sen; C H Raymond Ooi; Anirban Pathak

    2013-07-05T23:59:59.000Z

    An analytic operator solution of a generalized quantum mechanical Hamiltonian of two-mode Bose Einstein condensates (BECs) is obtained and the same is used to investigate the nonclassical properties of the modes present in the system. Nonclassical characters are observed by means of single mode and intermodal squeezing, single mode and intermodal sub-Poissonian boson statistics and intermodal entanglement. In addition to the traditionally studied lower order nonclassical properties, signatures of higher order nonclassical characters of two-mode BEC systems are also obtained by investigating the possibility of higher order antibunching and higher order entanglement. The mutual relation among the observed nonclassicalities and their evolution (variation) with rescaled time and the ratio of the single boson tunneling amplitude ($\\varepsilon$) and the coupling constant for the intra-modal interaction ($\\kappa$) are also reported.

  15. Edge modes in band topological insulators

    E-Print Network [OSTI]

    Lukasz Fidkowski; T. S. Jackson; Israel Klich

    2011-05-09T23:59:59.000Z

    We characterize gapless edge modes in translation invariant topological insulators. We show that the edge mode spectrum is a continuous deformation of the spectrum of a certain gluing function defining the occupied state bundle over the Brillouin zone (BZ). Topologically non-trivial gluing functions, corresponding to non-trivial bundles, then yield edge modes exhibiting spectral flow. We illustrate our results for the case of chiral edge states in two dimensional Chern insulators, as well as helical edges in quantum spin Hall states.

  16. Mixed Mode Fuel Injector And Injection System

    DOE Patents [OSTI]

    Stewart, Chris Lee (Normal, IL); Tian, Ye (Bloomington, IL); Wang, Lifeng (Normal, IL); Shafer, Scott F. (Morton, IL)

    2005-12-27T23:59:59.000Z

    A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set that are controlled respectively by first and second three way needle control valves. Each fuel injector includes first and second concentric needle valve members. One of the needle valve members moves to an open position for a homogenous charge injection event, while the other needle valve member moves to an open position for a conventional injection event. The fuel injector has the ability to operate in a homogenous charge mode with a homogenous charge spray pattern, a conventional mode with a conventional spray pattern or a mixed mode.

  17. Source depth for solar p-modes

    E-Print Network [OSTI]

    Pawan Kumar; Sarbani Basu

    2000-06-15T23:59:59.000Z

    Theoretically calculated power spectra are compares with observed solar p-mode velocity power spectra over a range of mode degree and frequency. The depth for the sources responsible for exciting p-modes of frequency 2.0 mHz is determined from the asymmetry of their power spectra and found to be about 800 km below the photosphere for quadrupole sources and 150 km if sources are dipole. The source depth for high frequency oscillations of frequency greater than about 6 mHz is 180 (50) km for quadrupole (dipole) sources.

  18. Kinetic theory of geodesic acoustic and related modes

    E-Print Network [OSTI]

    Kinetic theory of geodesic acoustic and related modes A.I. Smolyakov Department of Physics · Geodesic Acoustic Modes (GAM) are relatively high frequency eigen-modes supported by plasma compressibility history of GAM and related modes ·1968 : Geodesic acoustic modes: Winsor, Johnson, Dawson ·2000-05: Surge

  19. Single mode pulsed dye laser oscillator

    DOE Patents [OSTI]

    Hackel, Richard P. (Livermore, CA)

    1992-01-01T23:59:59.000Z

    A single mode pulsed dye laser oscillator is disclosed. The dye laser oscillator provides for improved power efficiency by reducing the physical dimensions of the overall laser cavity, which improves frequency selection capability.

  20. PLASTIC DEFORMATIONPLASTIC DEFORMATION Modes of Deformation

    E-Print Network [OSTI]

    Subramaniam, Anandh

    PLASTIC DEFORMATIONPLASTIC DEFORMATION Modes of Deformation The Uniaxial Tension Test Mechanisms underlying Plastic Deformation Strengthening mechanisms Mechanical Metallurgy George E Dieter McClick here to know about all the mechanisms by which materials fail #12;Slip (Dislocation motion) Plastic

  1. Single mode pulsed dye laser oscillator

    DOE Patents [OSTI]

    Hackel, R.P.

    1992-11-24T23:59:59.000Z

    A single mode pulsed dye laser oscillator is disclosed. The dye laser oscillator provides for improved power efficiency by reducing the physical dimensions of the overall laser cavity, which improves frequency selection capability. 6 figs.

  2. Whispering-gallery-mode-based seismometer

    SciTech Connect (OSTI)

    Fourguette, Dominique Claire; Otugen, M Volkan; Larocque, Liane Marie; Ritter, Greg Aan; Meeusen, Jason Jeffrey; Ioppolo, Tindaro

    2014-06-03T23:59:59.000Z

    A whispering-gallery-mode-based seismometer provides for receiving laser light into an optical fiber, operatively coupling the laser light from the optical fiber into a whispering-gallery-mode-based optical resonator, operatively coupling a spring of a spring-mass assembly to a housing structure; and locating the whispering-gallery-mode-based optical resonator between the spring-mass assembly and the housing structure so as to provide for compressing the whispering-gallery-mode-based optical resonator between the spring-mass assembly and the housing structure responsive to a dynamic compression force from the spring-mass assembly responsive to a motion of the housing structure relative to an inertial frame of reference.

  3. Rotary Mode Core Sample System availability improvement

    SciTech Connect (OSTI)

    Jenkins, W.W.; Bennett, K.L.; Potter, J.D. [Westinghouse Hanford Co., Richland, WA (United States); Cross, B.T.; Burkes, J.M.; Rogers, A.C. [Southwest Research Institute (United States)

    1995-02-28T23:59:59.000Z

    The Rotary Mode Core Sample System (RMCSS) is used to obtain stratified samples of the waste deposits in single-shell and double-shell waste tanks at the Hanford Site. The samples are used to characterize the waste in support of ongoing and future waste remediation efforts. Four sampling trucks have been developed to obtain these samples. Truck I was the first in operation and is currently being used to obtain samples where the push mode is appropriate (i.e., no rotation of drill). Truck 2 is similar to truck 1, except for added safety features, and is in operation to obtain samples using either a push mode or rotary drill mode. Trucks 3 and 4 are now being fabricated to be essentially identical to truck 2.

  4. Two-Mode Theory of BEC Interferometry

    E-Print Network [OSTI]

    B J Dalton

    2007-02-03T23:59:59.000Z

    A theory of BEC interferometry in an unsymmetrical double-well trap has been developed for small boson numbers, based on the two-mode approximation. The bosons are initially in the lowest mode of a single well trap, which is split into a double well and then recombined. Possible fragmentations into separate BEC states in each well during the splitting/recombination process are allowed for. The BEC is treated as a giant spin system, the fragmented states are eigenstates of S^2 and Sz. Self-consistent sets of equations for the amplitudes of the fragmented states and for the two single boson mode functions are obtained. The latter are coupled Gross-Pitaevskii equations. Interferometric effects may be measured via boson numbers in the first excited mode

  5. Singular Modes of the Electromagnetic Field

    E-Print Network [OSTI]

    Neil V. Budko; Alexander B. Samokhin

    2006-06-15T23:59:59.000Z

    We show that the mode corresponding to the point of essential spectrum of the electromagnetic scattering operator is a vector-valued distribution representing the square root of the three-dimensional Dirac's delta function. An explicit expression for this singular mode in terms of the Weyl sequence is provided and analyzed. An essential resonance thus leads to a perfect localization (confinement) of the electromagnetic field, which in practice, however, may result in complete absorption.

  6. Singular Modes of the Electromagnetic Field

    E-Print Network [OSTI]

    Budko, N V; Budko, Neil V.; Samokhin, Alexander B.

    2006-01-01T23:59:59.000Z

    We show that the mode corresponding to the point of essential spectrum of the electromagnetic scattering operator is a vector-valued distribution representing the square root of the three-dimensional Dirac's delta function. An explicit expression for this singular mode in terms of the Weyl sequence is provided and analyzed. An essential resonance thus leads to a perfect localization (confinement) of the electromagnetic field, which in practice, however, may result in complete absorption.

  7. Dirac Quasinormal modes of MSW black holes

    E-Print Network [OSTI]

    Sebastian, Saneesh

    2014-01-01T23:59:59.000Z

    In this paper we study the Dirac quasinormal modes of an uncharged 2 + 1 black hole proposed by Mandal et. al and referred to as MSW black hole in this work. The quasi- normal mode is studied using WKB approximation method. The study shows that the imaginary part of quasinormal frequencies increases indicating that the oscillations are damping and hence the black hole is stable against Dirac perturbations.

  8. Dirac Quasinormal modes of MSW black holes

    E-Print Network [OSTI]

    Saneesh Sebastian; V. C. Kuriakose

    2014-01-15T23:59:59.000Z

    In this paper we study the Dirac quasinormal modes of an uncharged 2 + 1 black hole proposed by Mandal et. al and referred to as MSW black hole in this work. The quasi- normal mode is studied using WKB approximation method. The study shows that the imaginary part of quasinormal frequencies increases indicating that the oscillations are damping and hence the black hole is stable against Dirac perturbations.

  9. Propagation Plane waves -High order Modes

    E-Print Network [OSTI]

    Berlin,Technische Universität

    1 Propagation · Plane waves - High order Modes y x a One wave: p(x,y,t)=p0 cos(k y)e-jk x e j t vy(y,t)= 0 ; y=0,a xy } ky = n a Propagation · Plane waves - High order Modes x n a p(x,y,t)=pn cos( y + - +- + + - +- + - + + +- - - (m,n) #12;4 Propagation · Circular duct ­ Helical waves (spiralling waves) kc=m/a kz k

  10. Propagation Plane waves -High order Modes

    E-Print Network [OSTI]

    Berlin,Technische Universität

    1 Propagation · Plane waves - High order Modes y x a ky = n a One wave: p(x,y,t)=p0 cos(k y)e-jk x e j t vy(y,t)= 0 ; y=0,a xy } Propagation · Plane waves - High order Modes x n a p(x,y,t)=pn cos( y;4 Propagation · Circular duct ­ Helical waves (spiralling waves) kc=m/a kz kH Projection: Propagation #12

  11. Forecasting Turbulent Modes with Nonparametric Diffusion Models

    E-Print Network [OSTI]

    Tyrus Berry; John Harlim

    2015-01-27T23:59:59.000Z

    This paper presents a nonparametric diffusion modeling approach for forecasting partially observed noisy turbulent modes. The proposed forecast model uses a basis of smooth functions (constructed with the diffusion maps algorithm) to represent probability densities, so that the forecast model becomes a linear map in this basis. We estimate this linear map by exploiting a previously established rigorous connection between the discrete time shift map and the semi-group solution associated to the backward Kolmogorov equation. In order to smooth the noisy data, we apply diffusion maps to a delay embedding of the noisy data, which also helps to account for the interactions between the observed and unobserved modes. We show that this delay embedding biases the geometry of the data in a way which extracts the most predictable component of the dynamics. The resulting model approximates the semigroup solutions of the generator of the underlying dynamics in the limit of large data and in the observation noise limit. We will show numerical examples on a wide-range of well-studied turbulent modes, including the Fourier modes of the energy conserving Truncated Burgers-Hopf (TBH) model, the Lorenz-96 model in weakly chaotic to fully turbulent regimes, and the barotropic modes of a quasi-geostrophic model with baroclinic instabilities. In these examples, forecasting skills of the nonparametric diffusion model are compared to a wide-range of stochastic parametric modeling approaches, which account for the nonlinear interactions between the observed and unobserved modes with white and colored noises.

  12. Edge-localized-modes in tokamaks

    SciTech Connect (OSTI)

    Leonard, A. W. [General Atomics, PO Box 85608, San Diego, California 92186-5608 (United States)

    2014-09-15T23:59:59.000Z

    Edge-localized-modes (ELMs) are a ubiquitous feature of H-mode in tokamaks. When gradients in the H-mode transport barrier grow to exceed the MHD stability limit the ELM instability grows explosively, rapidly transporting energy and particles onto open field lines and material surfaces. Though ELMs provide additional particle and impurity transport through the H-mode transport barrier, enabling steady operation, the resulting heat flux transients to plasma facing surfaces project to large amplitude in future low collisionality burning plasma tokamaks. Measurements of the ELM heat flux deposition onto material surfaces in the divertor and main chamber indicate significant broadening compared to inter-ELM heat flux, with a timescale for energy deposition that is consistent with sonic ion flow and numerical simulation. Comprehensive ELM simulation is highlighting the important physics processes of ELM transport including parallel transport due to magnetic reconnection and turbulence resulting from collapse of the H-mode transport barrier. Encouraging prospects for ELM control and/or suppression in future tokamaks include intrinsic modes of ELM free operation, ELM triggering with frequent small pellet injection and the application of 3D magnetic fields.

  13. Sandia National Laboratories: Failure Mode and Effect Analysis...

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

    ProcessFailure Mode and Effect Analysis (FMEA) Tutorial Failure Mode and Effect Analysis (FMEA) Tutorial Failure Mode and Effect Analysis (FMEA) Tutorial (SAND2012-0602W) Tagged...

  14. Mode Initialization for On-line Estimation of Power System Electromechanical Modes

    SciTech Connect (OSTI)

    Zhou, Ning; Trudnowski, Daniel; Pierre, John W.

    2009-03-18T23:59:59.000Z

    Measurement-based mode estimation methods are utilized to estimate electromechanical modes of a power system using phasor measurement units (PMU) data. These methods need to extract a certain amount of information before they can give useable mode estimation. Traditionally, the information is gathered solely from measurement data. Priori mode information from other resources (e.g. model eigenvalue analysis, engineering knowledge) are not fully utilized. For real time application, this means that mode estimation takes time to converge. By adding a mode regularization term in the objective function, this paper proposes a mode initialization method to include priori mode information in a regularized robust recursive least squares (R3LS) algorithm for on-line mode estimation. The proposed method is tested using a simple model, a 17 machine model and is shown to be able to shorten the convergence period of the R3LS algorithm. The proposed method is also applied on the measurement data recorded right before a major power outage in the western North American Grid on August 10th 1996 to show its potential applica-tion in detecting an approaching small signal stability problem.

  15. Modeling Combustion Control for High Power Diesel Mode Switching...

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

    Combustion Control for High Power Diesel Mode Switching Modeling Combustion Control for High Power Diesel Mode Switching Poster presentation given at the 16th Directions in...

  16. Unregulated Emissions from High-Efficiency Clean Combustion Modes...

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

    Unregulated Emissions from High-Efficiency Clean Combustion Modes - ORNL-FEERC Unregulated Emissions from High-Efficiency Clean Combustion Modes - ORNL-FEERC Poster presentation at...

  17. Modeling Combustion Control for High Power Diesel Mode Switching

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

    and Emissions Research Conference 2010 Modeling Combustion Control for High Power Diesel Mode Switching P-20 Motivation * High power LTC-diesel mode operation * Transient...

  18. Burning Modes and Oxidation Rates of Soot: Relevance to Diesel...

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

    Burning Modes and Oxidation Rates of Soot: Relevance to Diesel Particulate Traps Burning Modes and Oxidation Rates of Soot: Relevance to Diesel Particulate Traps Presentation given...

  19. Sequestering Uranium from Seawater: Binding Strength and Modes...

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

    Sequestering Uranium from Seawater: Binding Strength and Modes of Uranyl Complexes with Glutarimidedioxime Sequestering Uranium from Seawater: Binding Strength and Modes of Uranyl...

  20. Mixed-mode diesel HCCI with External Mixture Formation: Preliminary...

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

    Mixed-mode diesel HCCI with External Mixture Formation: Preliminary Results Mixed-mode diesel HCCI with External Mixture Formation: Preliminary Results 2003 DEER Conference...

  1. Detecting individual gravity modes in the Sun

    E-Print Network [OSTI]

    Garcia, R A; Eff-Darwich, A; Garrido, R; Jimenez, A; Mathis, S; Moya, A; Palle, P L; Regulo, C; Salabert, D; Suarez, J C; Turck-Chieze, S

    2009-01-01T23:59:59.000Z

    Many questions are still open regarding the structure and the dynamics of the solar core. By constraining more this region in the solar evolution models, we can reduce the incertitudes on some physical processes and on momentum transport mechanisms. A first big step was made with the detection of the signature of the dipole-gravity modes in the Sun, giving a hint of a faster rotation rate inside the core. A deeper analysis of the GOLF/SoHO data unveils the presence of a pattern of peaks that could be interpreted as dipole gravity modes. In that case, those modes can be characterized, thus bringing better constraints on the rotation of the core as well as some structural parameters such as the density at these very deep layers of the Sun interior.

  2. Self-Similar Modes of Coherent Diffusion

    E-Print Network [OSTI]

    O. Firstenberg; P. London; D. Yankelev; R. Pugatch; M. Shuker; N. Davidson

    2010-08-16T23:59:59.000Z

    Self-similar solutions of the coherent diffusion equation are derived and measured. The set of real similarity solutions is generalized by the introduction of a nonuniform phase surface, based on the elegant Gaussian modes of optical diffraction. In an experiment of light storage in a gas of diffusing atoms, a complex initial condition is imprinted, and its diffusion dynamics is monitored. The self-similarity of both the amplitude and the phase pattern is demonstrated, and an algebraic decay associated with the mode order is measured. Notably, as opposed to a regular diffusion spreading, a self-similar contraction of a special subset of the solutions is predicted and observed.

  3. Head-Tail Modes for Strong Space Charge

    SciTech Connect (OSTI)

    Burov, Alexey

    2008-12-01T23:59:59.000Z

    Head-tail modes are described here for the space charge tune shift significantly exceeding the synchrotron tune. General equation for the modes is derived. Spatial shapes of the modes, their frequencies, and coherent growth rates are explored. The Landau damping rates are also found. Suppression of the transverse mode coupling instability by the space charge is explained.

  4. B --> rho K* decays and other rare vector-vector modes

    E-Print Network [OSTI]

    G. Vasseur

    2007-04-03T23:59:59.000Z

    The recent analyses of the following rare vector-vector decays of the B meson are presented: rho K*, omega K*, omega rho, omega omega, and omega phi charmless final states. The latest results indicate that the fraction of longitudinal polarization is about 0.5 in penguin-dominated modes and close to 1 for tree-dominated modes.

  5. TERMINATION OF SIMPLY MODED WELLTYPED LOGIC PROGRAMS

    E-Print Network [OSTI]

    Giesl, Juergen

    TERMINATION OF SIMPLY MODED WELL­TYPED LOGIC PROGRAMS UNDER TABLED EXECUTION MECHANISM Sofie mechanism for logic programs. In particular, tabled execution of logic programs terminates more often than execution based on SLD­resolution. So, if a program can be proven to terminate under SLD­resolution (by one

  6. Deep reflection-mode photoacoustic imaging of

    E-Print Network [OSTI]

    Wang, Lihong

    near-infrared laser pulses of 804-nm wavelength for PA excitation to achieve deep penetration-frequency PAM system. To achieve deep penetration of light, we chose the 804-nm near-infrared wavelengthDeep reflection-mode photoacoustic imaging of biological tissue Kwang Hyun Song and Lihong V. Wang

  7. Standby and Off-Mode Energy Losses

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Standby and Off-Mode Energy Losses In New Appliances Measured in Shops #12;ISBN: 978 with the University of Coimbra. Its research interests include energyefficient technologies, renewable energies, and energy planning. Recent work includes the coordination of several European projects on market

  8. Do red giants have short mode lifetimes?

    E-Print Network [OSTI]

    D. Stello; H. Kjeldsen; T. R. Bedding; D. Buzasi

    2005-10-18T23:59:59.000Z

    We show evidence that the red giant star ksi Hya has an oscillation mode lifetime, tau, of about 2 days significantly shorter than predicted by theory (tau = 17 days, Houdek & Gough 2002). If this is a general trend of red giants it would limit the prospects of asteroseismology on these stars because of poor coherence of the oscillations.

  9. Psychological Insights on Transportation Mode Choice

    E-Print Network [OSTI]

    Bertini, Robert L.

    transportation modes such as bicycles, car sharing, and mass transit. Case studies were conducted with currentAlternatives to single occupancy vehicles:occupancy vehicles: Bicycles Buses Light rail Car sharing Car pooling Photo a car..." (TriMet Journal, March 6, 2006) He had been waiting for the train at the MAX platform (at 6 PM

  10. Thermionic converter in load-switching mode

    SciTech Connect (OSTI)

    Mendel'baum, M.A.; Es'kov, V.D.

    1983-01-01T23:59:59.000Z

    An electrical equivalent circuit is proposed for a thermionic electrogenerating element. It is suitable for calculation of transients in load-switching mode. Formulas are given for estimating circuit parameters. A sample numerical calculation is given for the transient between no-load and short-circuit regimes. The results may be employed to identify experimental data in the frequency domain.

  11. HYDROGEN LOCAL VIBRATIONAL MODES IN COMPOUND SEMICONDUCTORS

    E-Print Network [OSTI]

    McCluskey, Matthew

    HYDROGEN LOCAL VIBRATIONAL MODES IN COMPOUND SEMICONDUCTORS M.D. MCCLUSKEY* University) spectroscopy of hydrogen and deuterium in GaP, AlSb, ZnSe, and GaN has provided important information about the structures of dopant- hydrogen complexes and their interaction with the host lattice. In GaN:Mg, for example

  12. Self-consistent study of the alpha particle driven TAE mode

    SciTech Connect (OSTI)

    Wu, Y.; White, R.B.

    1994-04-01T23:59:59.000Z

    The interaction of high energy particles with an Alfven eigenmode is investigated self-consistently by using a realistic kinetic dispersion relation. All important poloidal mode numbers and their radial mode profiles as calculated with the NOVA-K code are included. A Hamiltonian guiding center code is used to simulate the alpha particle motion. The numerical simulations include particle orbit width, nonlinear particle dynamics and the effects of the modes on the particles. Modification of the particle distribution leading to mode saturation is observed. Particle loss is limited to devices in which the alpha particle gyro radius is a significant fraction of the minor radius.

  13. Radical Matter: Materiality in Postwar and Contemporary American Mixed Mode Poetry

    E-Print Network [OSTI]

    Wang, Sophia

    2012-01-01T23:59:59.000Z

    Mixed  Mode  Poetry   By   Sophia  Wang   A  dissertation  Mode  Poetry   by   Sophia  Wang   Doctor  of  Philosophy  

  14. Mode-synthesizing atomic force microscopy and mode-synthesizing sensing

    DOE Patents [OSTI]

    Passain, Ali; Thundat, Thomas George; Tetard, Laurene

    2014-07-22T23:59:59.000Z

    A method of analyzing a sample that includes applying a first set of energies at a first set of frequencies to a sample and applying, simultaneously with the applying the first set of energies, a second set of energies at a second set of frequencies, wherein the first set of energies and the second set of energies form a multi-mode coupling. The method further includes detecting an effect of the multi-mode coupling.

  15. Electron acceleration by Z-mode and whistler-mode waves

    SciTech Connect (OSTI)

    Lee, K. H. [Institute of Space Science, National Central University, Zhongli, Taiwan (China)] [Institute of Space Science, National Central University, Zhongli, Taiwan (China); Omura, Y. [Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto (Japan)] [Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto (Japan); Lee, L. C. [Institute of Space Science, National Central University, Zhongli, Taiwan (China) [Institute of Space Science, National Central University, Zhongli, Taiwan (China); Institute of Earth Science, Academia Sinica, Nankang, Taiwan (China)

    2013-11-15T23:59:59.000Z

    We carried out a series of particle simulations to study electron acceleration by Z-mode and whistler-mode waves generated by an electron ring distribution. The electron ring distribution leads to excitations of X-mode waves mainly in the perpendicular direction, Z-mode waves in the perpendicular and parallel directions, and whistler-mode waves mainly in the parallel direction. The parallel Z- and whistler-mode waves can lead to an effective acceleration of ring electrons. The electron acceleration is mainly determined by the wave amplitude and phase velocity, which in turn is affected by the ratio of electron plasma to cyclotron frequencies. For the initial kinetic energy ranging from 100 to 500 keV, the peak energy of the accelerated electrons is found to reach 2–8 times the initial kinetic energy. We further study the acceleration process by test-particle calculations in which electrons interact with one, two, or four waves. The electron trajectories in the one-wave case are simple diffusion curves. In the multi-wave cases, electrons are accelerated simultaneously by counter-propagating waves and can have a higher final energy.

  16. Phase modulation mode of scanning ion conductance microscopy

    SciTech Connect (OSTI)

    Li, Peng; Zhang, Changlin [State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Liu, Lianqing, E-mail: lqliu@sia.cn, E-mail: gli@engr.pitt.edu; Wang, Yuechao; Yang, Yang [State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016 (China); Li, Guangyong, E-mail: lqliu@sia.cn, E-mail: gli@engr.pitt.edu [Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261 (United States)

    2014-08-04T23:59:59.000Z

    This Letter reports a phase modulation (PM) mode of scanning ion conductance microscopy. In this mode, an AC current is directly generated by an AC voltage between the electrodes. The portion of the AC current in phase with the AC voltage, which is the current through the resistance path, is modulated by the tip-sample distance. It can be used as the input of feedback control to drive the scanner in Z direction. The PM mode, taking the advantages of both DC mode and traditional AC mode, is less prone to electronic noise and DC drift but maintains high scanning speed. The effectiveness of the PM mode has been proven by experiments.

  17. Geodesic stability, Lyapunov exponents and quasinormal modes

    E-Print Network [OSTI]

    Vitor Cardoso; Alex S. Miranda; Emanuele Berti; Helvi Witek; Vilson T. Zanchin

    2009-03-12T23:59:59.000Z

    Geodesic motion determines important features of spacetimes. Null unstable geodesics are closely related to the appearance of compact objects to external observers and have been associated with the characteristic modes of black holes. By computing the Lyapunov exponent, which is the inverse of the instability timescale associated with this geodesic motion, we show that, in the eikonal limit, quasinormal modes of black holes in any dimensions are determined by the parameters of the circular null geodesics. This result is independent of the field equations and only assumes a stationary, spherically symmetric and asymptotically flat line element, but it does not seem to be easily extendable to anti-de Sitter spacetimes. We further show that (i) in spacetime dimensions greater than four, equatorial circular timelike geodesics in a Myers-Perry black hole background are unstable, and (ii) the instability timescale of equatorial null geodesics in Myers-Perry spacetimes has a local minimum for spacetimes of dimension d > 5.

  18. ITER L-Mode Confinement Database

    SciTech Connect (OSTI)

    S.M. Kaye and the ITER Confinement Database Working Group

    1997-10-01T23:59:59.000Z

    This paper describes the content of an L-mode database that has been compiled with data from Alcator C-Mod, ASDEX, DIII, DIII-D, FTU, JET, JFT-2M, JT-60, PBX-M, PDX, T-10, TEXTOR, TFTR, and Tore-Supra. The database consists of a total of 2938 entries, 1881 of which are in the L-phase while 922 are ohmically heated (OH) only. Each entry contains up to 95 descriptive parameters, including global and kinetic information, machine conditioning, and configuration. The paper presents a description of the database and the variables contained therein, and it also presents global and thermal scalings along with predictions for ITER. The L-mode thermal confinement time scaling was determined from a subset of 1312 entries for which the thermal confinement time scaling was provided.

  19. Disordered Optical Modes for Photon Management

    E-Print Network [OSTI]

    Vynck, Kevin; Riboli, Francesco; Wiersma, Diederik S

    2012-01-01T23:59:59.000Z

    Wave transport in disordered systems is a vast research topic, ranging from electrons in semiconductors, to light in random dielectrics, to cold atoms in laser speckles. In optics, light transport is conveyed by random electromagnetic modes and the wave can be localized about a point or extended throughout the system, depending on disorder strength, structural correlations and dimensionality of the system. Light localization phenomena are more dominantly present in two-dimensional systems than in three-dimensional ones and their optical modes can be tailored to a greater extent. Here, we show that it is possible to make use of the properties of lower-dimensional disordered structures to obtain photon management in three-dimensional space. More particularly, we argue that two-dimensional disorder and wave interferences can be exploited to improve the performance of light absorbers or emitters. Our findings have direct applications for enhancing the absorption efficiency of third-generation solar cells in a rel...

  20. Failure modes at room and elevated temperatures. Technical report

    SciTech Connect (OSTI)

    Braun, L.M.

    1995-04-01T23:59:59.000Z

    Successful development of reliable ceramic composites will depend on an understanding of matrix cracking and damage mechanisms in these materials. Therefore, the objective of the Failure Models subtask is to investigate failure and damage mechanisms in fiber reinforced ceramic composites. Issues such as how fiber coatings, the fiber/matrix interface, residual stresses, and fiber volume fraction affect frictional stresses, fiber debonding, fiber pull-out and failure modes will be examined. The effect of these microstructural parameters on matrix crack initiation, propagation and damage will also be determined. The resulting observations and measurements data will be used to develop theoretical models for damage mechanisms in fiber reinforced composites. This report presents results concerning the effect of temperature on the failure modes of continuous fiber ceramic composites performed during the last quarter of FY 1993 and FY 1994. The Raman stress measurements and calculations were performed during the last quarter of FY 1994 and the first quarter of FY 1995.

  1. Stabilizing windings for tilting and shifting modes

    DOE Patents [OSTI]

    Jardin, Stephen C. (Princeton, NJ); Christensen, Uffe R. (Princeton, NJ)

    1984-01-01T23:59:59.000Z

    This invention relates to passive conducting loops for stabilizing a plasma ring against unstable tilting and/or shifting modes. To this end, for example, plasma ring in a spheromak is stabilized by a set of four figure-8 shaped loops having one pair on one side of the plasma and one pair on the other side with each pair comprising two loops whose axes are transverse to each other.

  2. Light plasmon mode in the CFL phase

    E-Print Network [OSTI]

    Malekzadeh, H; Rischke, Dirk H.

    2007-01-01T23:59:59.000Z

    The self-energies and the spectral densities of longitudinal and transverse gluons at zero temperature in the color-flavor-locked (CFL) phase are calculated. There appears a collective excitation, a light plasmon, at energies smaller than two times the gap parameter and momenta smaller than about eight times the gap. The minimum in the dispersion relation of this mode at some nonzero value of momentum corresponds to the van Hove singularity.

  3. Light plasmon mode in the CFL phase

    E-Print Network [OSTI]

    H. Malekzadeh; Dirk H. Rischke

    2006-11-10T23:59:59.000Z

    The self-energies and the spectral densities of longitudinal and transverse gluons at zero temperature in the color-flavor-locked (CFL) phase are calculated. There appears a collective excitation, a light plasmon, at energies smaller than two times the gap parameter and momenta smaller than about eight times the gap. The minimum in the dispersion relation of this mode at some nonzero value of momentum corresponds to the van Hove singularity.

  4. Compression mode resonances in Zr-90

    E-Print Network [OSTI]

    Youngblood, David H.; Lui, YW; John, B.; Tokimoto, Y.; Clark, HL; Chen, X.

    2004-01-01T23:59:59.000Z

    Compression mode resonances in 90Zr D. H. Youngblood, Y.-W. Lui, B. John,* Y. Tokimoto, H. L. Clark, and X. Chen Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA (Received 18 February 2004; published 20 May 2004..., JOHN, TOKIMOTO, CLARK, AND CHEN PHYSICAL REVIEW C 69, 054312 (2004) 054312-2 Fig. 2. The continuum distributions are similar over the en- tire energy range, whereas the angular distributions of the cross sections for the peak change...

  5. Measurements of Time-Dependent CP-Asymmetry Parameters in B Meson Decays to \\eta^{\\prime} K^0 and of Branching Fractions of SU(3) Related Modes with BaBar Experiment at SLAC

    SciTech Connect (OSTI)

    Biassoni, Pietro; /Milan U.

    2009-01-22T23:59:59.000Z

    In this thesis work we have measured the following upper limits at 90% of confidence level, for B meson decays (in units of 10{sup -6}), using a statistics of 465.0 x 10{sup 6} B{bar B} pairs: {Beta}(B{sup 0} {yields} {eta}K{sup 0}) < 1.6 {Beta}(B{sup 0} {yields} {eta}{eta}) < 1.4 {Beta}(B{sup 0} {yields} {eta}{prime}{eta}{prime}) < 2.1 {Beta}(B{sup 0} {yields} {eta}{phi}) < 0.52 {Beta}(B{sup 0} {yields} {eta}{omega}) < 1.6 {Beta}(B{sup 0} {yields} {eta}{prime}{phi}) < 1.2 {Beta}(B{sup 0} {yields} {eta}{prime}{omega}) < 1.7 We have no observation of any decay mode, statistical significance for our measurements is in the range 1.3-3.5 standard deviation. We have a 3.5{sigma} evidence for B {yields} {eta}{omega} and a 3.1 {sigma} evidence for B {yields} {eta}{prime}{omega}. The absence of observation of the B{sup 0} {yields} {eta}K{sup 0} open an issue related to the large difference compared to the charged mode B{sup +} {yields} {eta}K{sup +} branching fraction, which is measured to be 3.7 {+-} 0.4 {+-} 0.1 [118]. Our results represent substantial improvements of the previous ones [109, 110, 111] and are consistent with theoretical predictions. All these results were presented at Flavor Physics and CP Violation (FPCP) 2008 Conference, that took place in Taipei, Taiwan. They will be soon included into a paper to be submitted to Physical Review D. For time-dependent analysis, we have reconstructed 1820 {+-} 48 flavor-tagged B{sup 0} {yields} {eta}{prime}K{sup 0} events, using the final BABAR statistic of 467.4 x 10{sup 6} B{bar B} pairs. We use these events to measure the time-dependent asymmetry parameters S and C. We find S = 0.59 {+-} 0.08 {+-} 0.02, and C = -0.06 {+-} 0.06 {+-} 0.02. A non-zero value of C would represent a directly CP non-conserving component in B{sup 0} {yields} {eta}{prime}K{sup 0}, while S would be equal to sin2{beta} measured in B{sup 0} {yields} J/{psi}K{sub s}{sup 0} [108], a mixing-decay interference effect, provided the decay is dominated by amplitudes of a single weak phase. The new measured value of S can be considered in agreement with the expectations of the 'Standard Model', inside the experimental and theoretical uncertainties. Inconsistency of our result for S with CP conservation (S = 0) has a significance of 7.1 standard deviations (statistical and systematics included). Our result for the direct-CP violation parameter C is 0.9 standard deviations from zero (statistical and systematics included). Our results are in agreement with the previous ones [18]. Despite the statistics is only 20% larger than the one used in previous measurement, we improved of 20% the error on S and of 14% the error on C. This error is the smaller ever achieved, by both BABAR and Belle, in Time-Dependent CP Violation Parameters measurement is a b {yields} s transition.

  6. The Burst Mode of Protostellar Accretion

    E-Print Network [OSTI]

    E. I. Vorobyov; Shantanu Basu

    2006-07-06T23:59:59.000Z

    We present new numerical simulations in the thin-disk approximation which characterize the burst mode of protostellar accretion. The burst mode begins upon the formation of a centrifugally balanced disk around a newly formed protostar. It is comprised of prolonged quiescent periods of low accretion rate (typically $\\la 10^{-7} \\Msun$ yr$^{-1}$) which are punctuated by intense bursts of accretion (typically $\\ga 10^{-4} \\Msun$ yr$^{-1}$, with duration $\\la 100$ yr) during which most of the protostellar mass is accumulated. The accretion bursts are associated with the formation of dense protostellar/protoplanetary embryos, which are later driven onto the protostar by the gravitational torques that develop in the disk. Gravitational instability in the disk, driven by continuing infall from the envelope, is shown to be an effective means of transporting angular momentum outward, and mass inward to the protostar. We show that the disk mass always remains significantly less than the central protostar mass throughout this process. The burst phenomenon is robust enough to occur for a variety of initial values of rotation rate, frozen-in (supercritical) magnetic field, and density-temperature relations. Even in cases where the bursts are nearly entirely suppressed, a moderate increase in cloud size or rotation rate can lead to vigorous burst activity. We conclude that most (if not all) protostars undergo a burst mode of evolution during their early accretion history, as inferred empirically from observations of FU Orionis variables.

  7. Zero Net Energy Myths and Modes of Thought

    E-Print Network [OSTI]

    Rajkovich, Nicholas B.

    2010-01-01T23:59:59.000Z

    mypp.html. ———. (2009). "Net-Zero Energy CommercialZero Net Energy Myths and Modes of Thought  Nicholas B.  AC02? 05CH11231. Page | i Zero Net Energy Myths and Modes of

  8. Acoustic modes in combustors with complex impedances and multidimensional active

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Acoustic modes in combustors with complex impedances and multidimensional active flames F. Nicoud-acoustic modes in combustors. In the case of a non-isothermal reacting medium, the wave equation for the pressure

  9. Diagnostic for two-mode variable valve activation device

    DOE Patents [OSTI]

    Fedewa, Andrew M

    2014-01-07T23:59:59.000Z

    A method is provided for diagnosing a multi-mode valve train device which selectively provides high lift and low lift to a combustion valve of an internal combustion engine having a camshaft phaser actuated by an electric motor. The method includes applying a variable electric current to the electric motor to achieve a desired camshaft phaser operational mode and commanding the multi-mode valve train device to a desired valve train device operational mode selected from a high lift mode and a low lift mode. The method also includes monitoring the variable electric current and calculating a first characteristic of the parameter. The method also includes comparing the calculated first characteristic against a predetermined value of the first characteristic measured when the multi-mode valve train device is known to be in the desired valve train device operational mode.

  10. Extracting Operating Modes from Building Electrical Load Data: Preprint

    SciTech Connect (OSTI)

    Frank, S.; Polese, L. G.; Rader, E.; Sheppy, M.; Smith, J.

    2012-01-01T23:59:59.000Z

    Empirical techniques for characterizing electrical energy use now play a key role in reducing electricity consumption, particularly miscellaneous electrical loads, in buildings. Identifying device operating modes (mode extraction) creates a better understanding of both device and system behaviors. Using clustering to extract operating modes from electrical load data can provide valuable insights into device behavior and identify opportunities for energy savings. We present a fast and effective heuristic clustering method to identify and extract operating modes in electrical load data.

  11. Viscoelastic modes in a strongly coupled, cold, magnetized dusty plasma

    SciTech Connect (OSTI)

    Banerjee, Debabrata; Mylavarapu, Janaki Sita; Chakrabarti, Nikhil [Saha Institute of Nuclear Physics, I/AF Bidhannagar, Calcutta 700 064 (India)

    2010-11-15T23:59:59.000Z

    A generalized hydrodynamical model has been used to study the low frequency modes in a strongly coupled, cold, magnetized dusty plasma. Such plasmas exhibit elastic properties due to the strong correlations among dust particles and the tensile stresses imparted by the magnetic field. It has been shown that longitudinal compressional Alfven modes and elasticity modified transverse shear mode exist in such a medium. The features of these collective modes are established and discussed.

  12. The Influence of Topology Changes on Inter-area Oscillation Modes and Mode Shapes

    SciTech Connect (OSTI)

    Chen, Yousu; Fuller, Jason C.; Diao, Ruisheng; Zhou, Ning; Huang, Zhenyu; Tuffner, Francis K.

    2011-10-17T23:59:59.000Z

    The topology of a power grid network is a piece of critical information for power grid operations. Different power grid topologies can change grid characteristics, inter-area oscillation modes, mode shapes, and even the robustness of the power system. This paper presents some preliminary study results, based on an approved WECC operating case and a modified low damping WECC system, to show the impact of topology changes resulting from N-1 contingencies on power system modes and mode shapes. The results show that topology changes can have very different impact on modal properties in a power system: some result in unstable situation, while others can improve small signal stability. For the former, the studies show about 4.5% damping reduction, so 5% damping margin would be required to ensure the system can sustain the contingencies. For the latter, those topology changes could be used as a control method to improve small signal stability. Mode shapes normally do not change when there is an N-1 topology change. These observations suggest that the inclusion of topological information is useful for improving the accuracy and effectiveness of power system control schemes.

  13. Transportation Mode Detection using Mobile Phones and GIS Information

    E-Print Network [OSTI]

    Wolfson, Ouri E.

    Transportation Mode Detection using Mobile Phones and GIS Information Leon Stenneth, Ouri Wolfson, Chicago, IL 60607-7053 {lstennet, wolfson, psyu, boxu} @cs.uic.edu ABSTRACT The transportation mode. In this paper, we propose an approach to inferring a user's mode of transportation based on the GPS sensor

  14. Stability Properties of Toroidal Alfvn Modes Driven by Fast Particles

    E-Print Network [OSTI]

    of a strong drive, TAEs will be strongly modi#28;ed to new types of mode, the Resonant TAE[8] or Energetic #12; which is able to resolve new resonant branches of the toroidal Alfvén modes called resonant TAE, such as DIII-D at General Atomics [3]. A new type of chirping frequency modes was re- ported in spherical

  15. Search for the decay modes B±?h±??

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

    Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Milanes, D. A.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G.; Lynch, G.; Koch, H.; Schroeder, T.; Asgeirsson, D. J.; Hearty, C.; Mattison, T. S.; McKenna, J. A.; Khan, A.; Blinov, V. E.; Buzykaev, A. R.; Druzhinin, V. P.; Golubev, V. B.; Kravchenko, E. A.; Onuchin, A. P.; Serednyakov, S. I.; Skovpen, Yu. I.; Solodov, E. P.; Todyshev, K. Yu.; Yushkov, A. N.; Bondioli, M.; Kirkby, D.; Lankford, A. J.; Mandelkern, M.; Stoker, D. P.; Atmacan, H.; Gary, J. W.; Liu, F.; Long, O.; Vitug, G. M.; Campagnari, C.; Hong, T. M.; Kovalskyi, D.; Richman, J. D.; West, C. A.; Eisner, A. M.; Kroseberg, J.; Lockman, W. S.; Martinez, A. J.; Schalk, T.; Schumm, B. A.; Seiden, A.; Cheng, C. H.; Doll, D. A.; Echenard, B.; Flood, K. T.; Hitlin, D. G.; Ongmongkolkul, P.; Porter, F. C.; Rakitin, A. Y.; Andreassen, R.; Huard, Z.; Meadows, B. T.; Sokoloff, M. D.; Sun, L.; Bloom, P. C.; Ford, W. T.; Gaz, A.; Nagel, M.; Nauenberg, U.; Smith, J. G.; Wagner, S. R.; Ayad, R.; Toki, W. H.; Spaan, B.; Kobel, M. J.; Schubert, K. R.; Schwierz, R.; Bernard, D.; Verderi, M.; Clark, P. J.; Playfer, S.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Fioravanti, E.; Garzia, I.; Luppi, E.; Munerato, M.; Negrini, M.; Piemontese, L.; Santoro, V.; Baldini-Ferroli, R.; Calcaterra, A.; de Sangro, R.; Finocchiaro, G.; Patteri, P.; Peruzzi, I. M.; Piccolo, M.; Rama, M.; Zallo, A.; Contri, R.; Guido, E.; Lo Vetere, M.; Monge, M. R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Bhuyan, B.; Prasad, V.; Lee, C. L.; Morii, M.; Edwards, A. J.; Adametz, A.; Marks, J.; Uwer, U.; Lacker, H. M.; Lueck, T.; Dauncey, P. D.; Behera, P. K.; Mallik, U.; Chen, C.; Cochran, J.; Meyer, W. T.; Prell, S.; Rubin, A. E.; Gritsan, A. V.; Guo, Z. J.; Arnaud, N.; Davier, M.; Derkach, D.; Grosdidier, G.; Le Diberder, F.; Lutz, A. M.; Malaescu, B.; Roudeau, P.; Schune, M. H.; Stocchi, A.; Wormser, G.; Lange, D. J.; Wright, D. M.; Bingham, I.; Chavez, C. A.; Coleman, J. P.; Fry, J. R.; Gabathuler, E.; Hutchcroft, D. E.; Payne, D. J.; Touramanis, C.; Bevan, A. J.; Di Lodovico, F.; Sacco, R.; Sigamani, M.; Cowan, G.; Brown, D. N.; Davis, C. L.; Denig, A. G.; Fritsch, M.; Gradl, W.; Hafner, A.; Prencipe, E.; Alwyn, K. E.; Bailey, D.; Barlow, R. J.; Jackson, G.; Lafferty, G. D.; Behn, E.; Cenci, R.; Hamilton, B.; Jawahery, A.; Roberts, D. A.; Simi, G.; Dallapiccola, C.; Cowan, R.; Dujmic, D.; Sciolla, G.; Lindemann, D.; Patel, P. M.; Robertson, S. H.; Schram, M.; Biassoni, P.; Neri, N.; Palombo, F.; Stracka, S.; Cremaldi, L.; Godang, R.; Kroeger, R.; Sonnek, P.; Summers, D. J.; Nguyen, X.; Simard, M.; Taras, P.; De Nardo, G.; Monorchio, D.; Onorato, G.; Sciacca, C.; Martinelli, M.; Raven, G.; Jessop, C. P.; Knoepfel, K. J.; LoSecco, J. M.; Wang, W. F.; Honscheid, K.; Kass, R.; Brau, J.; Frey, R.; Sinev, N. B.; Strom, D.; Torrence, E.; Feltresi, E.; Gagliardi, N.; Margoni, M.; Morandin, M.; Posocco, M.; Rotondo, M.; Simonetto, F.; Stroili, R.; Akar, S.; Ben-Haim, E.; Bomben, M.; Bonneaud, G. R.; Briand, H.; Calderini, G.; Chauveau, J.; Hamon, O.; Leruste, Ph.; Marchiori, G.; Ocariz, J.; Sitt, S.; Biasini, M.; Manoni, E.; Pacetti, S.; Rossi, A.; Angelini, C.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Cervelli, A.; Forti, F.; Giorgi, M. A.; Lusiani, A.; Oberhof, B.; Paoloni, E.; Perez, A.; Rizzo, G.; Walsh, J. J.; Lopes Pegna, D.; Lu, C.; Olsen, J.; Smith, A. J. S.; Telnov, A. V.; Anulli, F.; Cavoto, G.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Gaspero, M.; Li Gioi, L.; Mazzoni, M. A.; Piredda, G.; Bünger, C.; Grünberg, O.; Hartmann, T.; Leddig, T.; Schröder, H.; Voss, C.; Waldi, R.; Adye, T.; Olaiya, E. O.; Wilson, F. F.; Emery, S.; Hamel de Monchenault, G.; Vasseur, G.; Yèche, Ch.; Aston, D.; Bard, D. J.; Bartoldus, R.; Cartaro, C.; Convery, M. R.; Dorfan, J.; Dubois-Felsmann, G. P.; Dunwoodie, W.; Ebert, M.; Field, R. C.; Franco Sevilla, M.; Fulsom, B. G.; Gabareen, A. M.; Graham, M. T.; Grenier, P.; Hast, C.; Innes, W. R.; Kelsey, M. H.; Kim, P.; Kocian, M. L.; Leith, D. W. G. S.; Lewis, P.; Lindquist, B.; Luitz, S.; Luth, V.; Lynch, H. L.; MacFarlane, D. B.; Muller, D. R.; Neal, H.; Nelson, S.; Perl, M.; Pulliam, T.; Ratcliff, B. N.; Roodman, A.; Salnikov, A. A.; Schindler, R. H.; Snyder, A.; Su, D.; Sullivan, M. K.; Va’vra, J.; Wagner, A. P.; Weaver, M.; Wisniewski, W. J.; Wittgen, M.; Wright, D. H.; Wulsin, H. W.; Young, C. C.; Ziegler, V.; Park, W.; Purohit, M. V.; White, R. M.; Wilson, J. R.; Randle-Conde, A.; Sekula, S. J.; Bellis, M.; Benitez, J. F.; Burchat, P. R.; Miyashita, T. S.; Alam, M. S.; Ernst, J. A.; Gorodeisky, R.; Guttman, N.; Peimer, D. R.; Soffer, A.; Lund, P.; Spanier, S. M.; Eckmann, R.; Ritchie, J. L.

    2012-07-01T23:59:59.000Z

    We present a search for the lepton flavor violating decay modes B±?h±?? (h=K, ?; ?=e, ?) using the BABAR data sample, which corresponds to 472×10? BB¯¯¯ pairs. The search uses events where one B meson is fully reconstructed in one of several hadronic final states. Using the momenta of the reconstructed B, h, and ? candidates, we are able to fully determine the ? four-momentum. The resulting ? candidate mass is our main discriminant against combinatorial background. We see no evidence for B±?h±?? decays and set a 90% confidence level upper limit on each branching fraction at the level of a few times 10??.

  16. Inflation, Symmetry, and B-Modes

    E-Print Network [OSTI]

    Mark P. Hertzberg

    2014-03-20T23:59:59.000Z

    We examine the role of using symmetry and effective field theory in inflationary model building. We describe the standard formulation of starting with an approximate shift symmetry for a scalar field, and then introducing corrections systematically in order to maintain control over the inflationary potential. We find that this leads to models in good agreement with recent data. On the other hand, there are attempts in the literature to deviate from this paradigm by envoking other symmetries and corrections. In particular: in a suite of recent papers, several authors have made the claim that standard Einstein gravity with a cosmological constant and a massless scalar carries conformal symmetry. They further claim that such a theory carries another hidden symmetry; a global SO(1,1) symmetry. By deforming around the global SO(1,1) symmetry, they are able to produce a range of inflationary models with asymptotically flat potentials, whose flatness is claimed to be protected by these symmetries. These models tend to give rise to B-modes with small amplitude. Here we explain that these authors are merely introducing a redundancy into the description, not an actual conformal symmetry. Furthermore, we explain that the only real (global) symmetry in these models is not at all hidden, but is completely manifest when expressed in the Einstein frame; it is in fact the shift symmetry of a scalar field. When analyzed systematically as an effective field theory, deformations do not generally produce asymptotically flat potentials and small B-modes, but other types of potentials with B-modes of large amplitude; nicely compatible with recent BICEP2 data. Such simple models typically also produce the observed red spectral index, Gaussian fluctuations, etc. In short: simple models of inflation, organized by expanding around a shift symmetry, are in excellent agreement with recent data.

  17. NSTX Failure Modes & Effects Analysis / NSTX-FMEA-71-10 / p. 1 of 115 FAILURE MODES AND EFFECTS ANALYSIS

    E-Print Network [OSTI]

    Princeton Plasma Physics Laboratory

    NSTX Failure Modes & Effects Analysis / NSTX-FMEA-71-10 / p. 1 of 115 NSTX FAILURE MODES AND EFFECTS ANALYSIS (FMEA) Revision 10 Dated: November 2014 Prepared By: Name/WBS Signature Name: ________________________________________________ Ron Strykowsky, NSTX Upgrade Project Manager #12;NSTX Failure Modes & Effects Analysis / NSTX-FMEA-71

  18. ELECTROSTATIC MODE ASSOCIATED WITH PINCH VELOCITY IN RFPS

    SciTech Connect (OSTI)

    DELZANNO, GIAN LUCA [Los Alamos National Laboratory; FINN, JOHN M. [Los Alamos National Laboratory; CHACON, LUIS [Los Alamos National Laboratory

    2007-02-08T23:59:59.000Z

    The existence of a new electrostatic instability is shown for RFP (reversed field pinch) equilibria. This mode arises due to the non-zero equilibrium radial flow (pinch flow). In RFP simulations with no-stress boundary conditions on the tangential velocity at the radial wall, this electrostatic mode is unstable and dominates the nonlinear dynamics, even in the presence of the MHD modes typically responsible for the reversal of the axial magnetic field at edge. Nonlinearly, this mode leads to two beams moving azimuthally towards each other, which eventually collide. The electrostatic mode can be controlled by using Dirichlet (no-slip) boundary conditions on the azimuthal velocity at the radial wall.

  19. Effect of Trapped Energetic Particles on the Resistive Wall Mode

    SciTech Connect (OSTI)

    Hao, G. Z.; Wang, A. K.; Qiu, X. M. [Southwestern Institute of Physics, Post Office Box 432, Chengdu 610041 (China); Liu, Y. Q. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom)

    2011-07-01T23:59:59.000Z

    A stability analysis for the resistive wall mode is studied in the presence of trapped energetic particles (EPs). When the EPs' beta exceeds a critical value, a fishbonelike bursting mode (FLM) with an external kink eigenstructure can exist. This offers the first analytic interpretation of the experimental observations [Phys. Rev. Lett. 103, 045001 (2009)]. The mode-particle resonances for the FLM and the q=1 fishbone occur in different regimes of the precession frequency of EPs. In certain ranges of the plasma rotation speed and the EPs' beta, a mode conversion can occur between the resistive wall mode and FLM.

  20. Second harmonic effect on geodesic modes in tokamak plasmas

    SciTech Connect (OSTI)

    Elfimov, A. G.; Galvão, R. M. O. [Institute of Physics, University of São Paulo, São Paulo 05508-090 (Brazil)] [Institute of Physics, University of São Paulo, São Paulo 05508-090 (Brazil); Smolyakov, A. I. [University of Saskatchewan, 116 Science Place, Saskatoon S7N 5E2 (Canada) [University of Saskatchewan, 116 Science Place, Saskatoon S7N 5E2 (Canada); Institute of Tokamak Physics, NRC “Kurchatov Institute,” 123182 Moscow (Russian Federation); Melnikov, A. V. [Institute of Tokamak Physics, NRC “Kurchatov Institute,” 123182 Moscow (Russian Federation)] [Institute of Tokamak Physics, NRC “Kurchatov Institute,” 123182 Moscow (Russian Federation)

    2013-05-15T23:59:59.000Z

    Results of a kinetic treatment of Geodesic Acoustic Modes (GAMs) that fully takes into account ion parallel dynamics, including the magnetic field component, are presented. The finite-orbit-width (FOW) parameter is considered in the calculation of the second harmonic effect on GAMs. For larger values of the FOW parameter, it is shown that dispersive effects related to the m = 2 harmonics is the cause of the mode frequency splitting and the modes appear due to the interaction with the ion sound mode. Furthermore, the modes may have enhanced damping rates due to second harmonic Landau damping.

  1. Damping of unwanted modes in SRF deflecting/crabbing cavities

    SciTech Connect (OSTI)

    Burt, Graeme [University of Lancaster (United Kingdom); Wang, Haipeng [JLAB, Newport News, VA (United States)

    2014-01-01T23:59:59.000Z

    As deflecting and crab cavities do not use the fundamental acceleration mode for their operation, the spectrum of unwanted modes is significantly different from that of accelerating cavities. The fundamental acceleration mode is now unwanted and can cause energy spread in the beam; in addition this mode frequency is often close to or lower than that of the deflecting mode, making it difficult to damp. This is made more complex in some of the compact crab cavities as there small beampipes often attenuate the fields very sharply. In addition in some crab cavities there can be an orthogonal transverse mode similar to the deflecting mode, known as the same order mode. The degeneracy of these modes must be split by polarising the cavity and if the polarisation is not large enough, dampers should be placed at either an electric or magnetic field null of the crabbing mode to effectively damp the unwanted polarisation. Various concepts for dealing with unwanted modes in various SRF deflecting cavities will be reviewed.

  2. Multi-mode ultrasonic welding control and optimization

    DOE Patents [OSTI]

    Tang, Jason C.H.; Cai, Wayne W

    2013-05-28T23:59:59.000Z

    A system and method for providing multi-mode control of an ultrasonic welding system. In one embodiment, the control modes include the energy of the weld, the time of the welding process and the compression displacement of the parts being welded during the welding process. The method includes providing thresholds for each of the modes, and terminating the welding process after the threshold for each mode has been reached, the threshold for more than one mode has been reached or the threshold for one of the modes has been reached. The welding control can be either open-loop or closed-loop, where the open-loop process provides the mode thresholds and once one or more of those thresholds is reached the welding process is terminated. The closed-loop control provides feedback of the weld energy and/or the compression displacement so that the weld power and/or weld pressure can be increased or decreased accordingly.

  3. A current driven electromagnetic mode in sheared and toroidal configurations

    E-Print Network [OSTI]

    Pusztai, István; Parra, Felix I; Barnes, Michael

    2013-01-01T23:59:59.000Z

    The induced electric field in a tokamak drives a parallel electron current flow. In an inhomogeneous, finite beta plasma, when this electron flow is comparable to the ion thermal speed, the Alfven mode wave solutions of the electromagnetic gyrokinetic equation can become nearly purely growing kink modes. Using the new "low-flow" version of the gyrokinetic code GS2 developed for momentum transport studies [Barnes et al 2013 Phys. Rev. Lett. 111, 055005], we are able to model the effect of the induced parallel electric field on the electron distribution to study the destabilizing influence of current on stability. We identify high mode number kink modes in GS2 simulations and make comparisons to analytical theory in sheared magnetic geometry. We demonstrate reassuring agreement with analytical results both in terms of parametric dependences of mode frequencies and growth rates, and regarding the radial mode structure.

  4. Towards a detection of individual g modes in the Sun

    E-Print Network [OSTI]

    Garcia, R A; Eff-Darwich, A; Garrido, R; Jimenez, A; Mathis, S; Mathur, S; Moya, A; Palle, P L; Regulo, C; Salabert, D; Suarez, J C; Turck-Chieze, S

    2010-01-01T23:59:59.000Z

    Since the detection of the asymptotic properties of the dipole gravity modes in the Sun, the quest to find the individual gravity modes has continued. A deeper analysis of the GOLF/SoHO data unveils the presence of a pattern of peaks that could be interpreted as individual dipole gravity modes. The computed collapsed spectrum -around these candidate modes- uncovers the presence of a quasi constant frequency splitting, in contrast with regions where no g modes are expected in which the collapsogram gives random results. Besides, the same technique applied to VIRGO/SoHO unveils some common signals between both power spectra. Thus, we can identify and characterize the modes, for example, with their central frequency and splittings. This would open the path towards new investigations to better constrain the solar core.

  5. Microwave mode shifting antenna system for regenerating particulate filters

    DOE Patents [OSTI]

    Gonze, Eugene V [Pinckney, MI; Kirby, Kevin W [Calabasas Hills, CA; Phelps, Amanda [Malibu, CA; Gregoire, Daniel J [Thousand Oaks, CA

    2011-04-26T23:59:59.000Z

    A regeneration system comprises a particulate matter (PM) filter including a microwave energy absorbing surface, and an antenna system comprising N antennas and an antenna driver module that sequentially drives the antenna system in a plurality of transverse modes of the antenna system to heat selected portions of the microwave absorbing surface to regenerate the PM filter, where N is an integer greater than one. The transverse modes may include transverse electric (TE) and/or transverse magnetic (TM) modes.

  6. Optimization to reduce fuel consumption in charge depleting mode

    DOE Patents [OSTI]

    Roos, Bryan Nathaniel; Martini, Ryan D.

    2014-08-26T23:59:59.000Z

    A powertrain includes an internal combustion engine, a motor utilizing electrical energy from an energy storage device, and a plug-in connection. A Method for controlling the powertrain includes monitoring a fuel cut mode, ceasing a fuel flow to the engine based upon the fuel cut mode, and through a period of operation including acceleration of the powertrain, providing an entirety of propelling torque to the powertrain with the electrical energy from the energy storage device based upon the fuel cut mode.

  7. Circular modes for flat beams in the LHC

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

    Burov, A.

    2013-06-01T23:59:59.000Z

    Typically x/y optical coupling is considered as unwanted and thus suppressed; particular exclusions are electron and ionization coolers. Could some special coupled modes be effectively applied for the LHC complex? Perhaps, the answer is positive: use of the circular modes in the injectors with their transformation into planar modes in the LHC allows both the space charge and beam-beam luminosity limitations to be significantly reduced, if not practically eliminated.

  8. Theory of semicollisional kinetic Alfven modes in sheared magnetic fields

    SciTech Connect (OSTI)

    Hahm, T.S.; Chen, L.

    1985-02-01T23:59:59.000Z

    The spectra of the semicollisional kinetic Alfven modes in a sheared slab geometry are investigated, including the effects of finite ion Larmor radius and diamagnetic drift frequencies. The eigenfrequencies of the damped modes are derived analytically via asymptotic analyses. In particular, as one reduces the resistivity, we find that, due to finite ion Larmor radius effects, the damped mode frequencies asymptotically approach finite real values corresponding to the end points of the kinetic Alfven continuum.

  9. Mode trap for absorbing transverse modes of an accelerated electron beam

    DOE Patents [OSTI]

    Chojnacki, E.P.

    1994-05-31T23:59:59.000Z

    A mode trap to trap and absorb transverse modes formed by a beam in a linear accelerator includes a waveguide having a multiplicity of electrically conductive (preferably copper) irises and rings, each iris and ring including an aperture, and the irises and rings being stacked in a side-by-side, alternating fashion such that the apertures of the irises and rings are concentrically aligned. An absorbing material layer such as a dielectric is embedded in each iris and ring, and this absorbing material layer encircles, but is circumferentially spaced from its respective aperture. Each iris and ring includes a plurality of circumferentially spaced slots around its aperture and extending radially out toward its absorbing material layer. 9 figs.

  10. Mode trap for absorbing transverse modes of an accelerated electron beam

    DOE Patents [OSTI]

    Chojnacki, Eric P. (Woodridge, IL)

    1994-01-01T23:59:59.000Z

    A mode trap to trap and absorb transverse modes formed by a beam in a linear accelerator includes a waveguide having a multiplicity of electrically conductive (preferably copper) irises and rings, each iris and ring including an aperture, and the irises and rings being stacked in a side-by-side, alternating fashion such that the apertures of the irises and rings are concentrically aligned. An absorbing material layer such as a dielectric is embedded in each iris and ring, and this absorbing material layer encircles, but is circumferentially spaced from its respective aperture. Each iris and ring includes a plurality of circumferentially spaced slots around its aperture and extending radially out toward its absorbing material layer.

  11. Asymmetric modes decomposition in an overmoded relativistic backward wave oscillator

    SciTech Connect (OSTI)

    Zhang, Dian; Zhang, Jun, E-mail: zhangjun@nudt.edu.cn; Zhong, Huihuang; Jin, Zhenxing; Ju, Jinchuan [College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073 (China)

    2014-09-15T23:59:59.000Z

    Most of the investigated overmoded relativistic backward wave oscillators (RBWOs) are azimuthally symmetric; thus, they are designed through two dimensional (2-D) particle-in-cell (PIC) simulations. However, 2-D PIC simulations cannot reveal the effect of asymmetric modes on beam-wave interaction. In order to investigate whether asymmetric mode competition needs to be considered in the design of overmoded RBWOs, a numerical method of determining the composition of both symmetric and asymmetric modes in three dimensional (3-D) PIC simulations is introduced in this paper. The 2-D and 3-D PIC simulation results of an X-band overmoded RBWO are analyzed. Our analysis indicates that the 2-D and 3-D PIC simulation results of our device are quite different due to asymmetric mode competition. In fact, asymmetric surface waves, especially EH{sub 11} mode, can lead to serious mode competition when electron beam propagates near the surface of slow wave structures (SWSs). Therefore, additional method of suppressing asymmetric mode competition, such as adjusting the reflections at both ends of SWSs to decrease the Q-factor of asymmetric modes, needs to be utilized in the design of overmoded RBWOs. Besides, 3-D PIC simulation and modes decomposition are essential for designing overmoded RBWOs.

  12. Combined Field Integral Equation Based Theory of Characteristic Mode

    E-Print Network [OSTI]

    Qi I. Dai; Qin S. Liu; Hui Gan; Weng Cho Chew

    2015-03-04T23:59:59.000Z

    Conventional electric field integral equation based theory is susceptible to the spurious internal resonance problem when the characteristic modes of closed perfectly conducting objects are computed iteratively. In this paper, we present a combined field integral equation based theory to remove the difficulty of internal resonances in characteristic mode analysis. The electric and magnetic field integral operators are shown to share a common set of non-trivial characteristic pairs (values and modes), leading to a generalized eigenvalue problem which is immune to the internal resonance corruption. Numerical results are presented to validate the proposed formulation. This work may offer efficient solutions to characteristic mode analysis which involves electrically large closed surfaces.

  13. CHARACTERIZATION OF A GEIGER-MODE AVALANCHE PHOTODIODE DETECTOR FOR

    E-Print Network [OSTI]

    Eloranta, Edwin W.

    CHARACTERIZATION OF A GEIGER-MODE AVALANCHE PHOTODIODE DETECTOR FOR HIGH SPECTRAL RESOLUTION LIDAR................................................................................................ 20 3.2 Operation principles of an avalanche photodiode.................................. 22 3

  14. Mode Splitting for Efficient Plasmoinc Thin-film Solar Cell

    E-Print Network [OSTI]

    Li, Tong; Jiang, Chun

    2010-01-01T23:59:59.000Z

    We propose an efficient plasmonic structure consisting of metal strips and thin-film silicon for solar energy absorption. We numerically demonstrate the absorption enhancement in symmetrical structure based on the mode coupling between the localized plasmonic mode in Ag strip pair and the excited waveguide mode in silicon slab. Then we explore the method of symmetry-breaking to excite the dark modes that can further enhance the absorption ability. We compare our structure with bare thin-film Si solar cell, and results show that the integrated quantum efficiency is improved by nearly 90% in such thin geometry. It is a promising way for the solar cell.

  15. Implementing the DC Mode in Cosmological Simulations with Supercomoving Variables

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

    Gnedin, Nickolay Y.; Kravtsov, Andrey V.; Rudd, Douglas H.

    2011-06-02T23:59:59.000Z

    As emphasized by previous studies, proper treatment of the density fluctuation on the fundamental scale of a cosmological simulation volume - the 'DC mode' - is critical for accurate modeling of spatial correlations on scales ~> 10% of simulation box size. We provide further illustration of the effects of the DC mode on the abundance of halos in small boxes and show that it is straightforward to incorporate this mode in cosmological codes that use the 'supercomoving' variables. The equations governing evolution of dark matter and baryons recast with these variables are particularly simple and include the expansion factor, and hence the effect of the DC mode, explicitly only in the Poisson equation.

  16. Rollover analysis of rotary mode core sampler truck No. 2

    SciTech Connect (OSTI)

    Ziada, H.H.

    1994-11-08T23:59:59.000Z

    This document provides estimate of limiting speed and rollover analysis of rotary mode core sampler truck No. 2 (RMCST No. 2).

  17. Hydrodynamic Modes of a holographic $p-$ wave superfluid

    E-Print Network [OSTI]

    Raul E. Arias; Ignacio Salazar Landea

    2014-11-04T23:59:59.000Z

    In this work we analyze the hydrodynamics of a $p-$ wave superfluid on its strongly coupled regime by considering its holographic description. We obtain the poles of the retarded Green function through the computation of the quasi-normal modes of the dual AdS black hole background finding diffusive, pseudo-diffusive and sound modes. For the sound modes we compute the speed of sound and its attenuation as function of the temperature. For the diffusive and pseudo-diffusive modes we find that they acquire a non-zero real part at certain finite momentum.

  18. PROPERTIES OF OSCILLATION MODES IN SUBGIANT STARS OBSERVED BY KEPLER

    SciTech Connect (OSTI)

    Benomar, O.; Bedding, T. R.; Stello, D.; White, T. R.; Kuehn, C. A. [Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, Sydney, NSW 2006 (Australia); Mosser, B.; Belkacem, K. [LESIA, Observatoire de Paris, CNRS UMR 8109, Universite Paris Diderot, 5 Place J. Janssen, F-92195 Meudon (France); Garcia, R. A. [Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot (France); IRFU/SAp, Centre de Saclay, F-91191 Gif-sur-Yvette Cedex (France); Deheuvels, S. [Institut de Recherche en Astrophysique et Planetologie, Universite de Toulouse, UPS-OMP, CNRS, 14 Avenue Edouard Belin, F-31400 Toulouse (France); Christensen-Dalsgaard, J. [Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C (Denmark)

    2013-04-20T23:59:59.000Z

    Mixed modes seen in evolved stars carry information on their deeper layers that can place stringent constraints on their physics and on their global properties (mass, age, etc.). In this study, we present a method to identify and measure all oscillatory mode characteristics (frequency, height, width). Analyzing four subgiant stars, we present the first measure of the effect of the degree of mixture on the l = 1 mixed mode characteristics. We also show that some stars have measurable l = 2 mixed modes and discuss the interest of their measure to constrain the deeper layers of stars.

  19. Resonant absorption in semiconductor nanowires and nanowire arrays: Relating leaky waveguide modes to Bloch photonic crystal modes

    SciTech Connect (OSTI)

    Fountaine, Katherine T., E-mail: kfountai@caltech.edu [Department of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd., Pasadena, California 91125 (United States); Joint Center for Artificial Photosynthesis, California Institute of Technology, 1200 E. California Blvd., Pasadena, California 91125 (United States); Whitney, William S. [Joint Center for Artificial Photosynthesis, California Institute of Technology, 1200 E. California Blvd., Pasadena, California 91125 (United States); Department of Physics, California Institute of Technology, 1200 E. California Blvd., Pasadena, California 91125 (United States); Atwater, Harry A. [Joint Center for Artificial Photosynthesis, California Institute of Technology, 1200 E. California Blvd., Pasadena, California 91125 (United States); Department of Applied Physics and Materials Science, California Institute of Technology, 1200 E. California Blvd., Pasadena, California 91125 (United States)

    2014-10-21T23:59:59.000Z

    We present a unified framework for resonant absorption in periodic arrays of high index semiconductor nanowires that combines a leaky waveguide theory perspective and that of photonic crystals supporting Bloch modes, as array density transitions from sparse to dense. Full dispersion relations are calculated for each mode at varying illumination angles using the eigenvalue equation for leaky waveguide modes of an infinite dielectric cylinder. The dispersion relations along with symmetry arguments explain the selectivity of mode excitation and spectral red-shifting of absorption for illumination parallel to the nanowire axis in comparison to perpendicular illumination. Analysis of photonic crystal band dispersion for varying array density illustrates that the modes responsible for resonant nanowire absorption emerge from the leaky waveguide modes.

  20. Dual mode stereotactic localization method and application

    DOE Patents [OSTI]

    Keppel, Cynthia E. (Norfolk, VA); Barbosa, Fernando Jorge (Newport News, VA); Majewski, Stanislaw (Grafton, VA)

    2002-01-01T23:59:59.000Z

    The invention described herein combines the structural digital X-ray image provided by conventional stereotactic core biopsy instruments with the additional functional metabolic gamma imaging obtained with a dedicated compact gamma imaging mini-camera. Before the procedure, the patient is injected with an appropriate radiopharmaceutical. The radiopharmaceutical uptake distribution within the breast under compression in a conventional examination table expressed by the intensity of gamma emissions is obtained for comparison (co-registration) with the digital mammography (X-ray) image. This dual modality mode of operation greatly increases the functionality of existing stereotactic biopsy devices by yielding a much smaller number of false positives than would be produced using X-ray images alone. The ability to obtain both the X-ray mammographic image and the nuclear-based medicine gamma image using a single device is made possible largely through the use of a novel, small and movable gamma imaging camera that permits its incorporation into the same table or system as that currently utilized to obtain X-ray based mammographic images for localization of lesions.

  1. Quantum dynamics of two-optical modes and a single mechanical mode optomechanical system: selective energy exchange

    E-Print Network [OSTI]

    Neha Aggarwal; Aranya B Bhattacherjee

    2013-02-06T23:59:59.000Z

    We study the quantum dynamics of an optomechanical setup comprising two optical modes and one mechanical mode. We show that the same system can undergo a Dicke-Hepp-Lieb superradiant type phase transition. We found that the coupling between the momentum quadratures of the two optical fields give rise to a new critical point. We show that selective energy exchange between any two modes is possible by coherent control of the coupling parameters. In addition we also demonstrate the occurrence of Normal Mode Splitting (NMS) in the mechanical displacement spectrum.

  2. Parametric Excitation of Geodesic Acoustic Modes by Electron Drift Waves and Ion Temperature Gradient Modes in Tokamak Plasmas

    SciTech Connect (OSTI)

    Guzdar, P. N.; Kleva, R. G. [IREAP, University of Maryland, College Park, MD 20742 (United States); Chakrabarti, N. [SINP, Kolkata (India); Kaw, P. K.; Singh, R. [IPR, Gandhinagar, 308423 (India); Naulin, V.; Rasmussen, J. J. [EURATOM, Roskilde (Denmark)

    2008-11-01T23:59:59.000Z

    Geodesic Acoustic Modes (GAMs) have been predicted and subsequently observed in many toroidal plasma devices. Bicoherence studies on various devices have suggested three-wave mode coupling processes between GAMs and high frequency turbulence. Thus the parametric coupling of GAMS to drift waves and/or ion temperature gradient(ITG{r_brace} modes is a potential candidate for excitation of these modes. In this paper we discuss the resonant three-wave coupling mechanism for the excitation of GAMs by ITG and finite beta drift waves in homogeneous and inhomogeneous plasmas and compare theoretical predictions with observed characteristics of the GAMs.

  3. Neutral Color Superconductivity and Pseudo-Goldstone Modes

    E-Print Network [OSTI]

    Lianyi He; Meng Jin; Pengfei Zhuang

    2005-05-09T23:59:59.000Z

    Four of the five expected Goldstone modes, which will be eaten up by gauge fields, in neutral two-flavor color superconductor are actually pseudo-Goldstone modes, and their degenerated mass is exactly the magnitude of the color chemical potential, which is introduced to guarantee the color neutrality at moderate baryon density.

  4. Mode coherence at megameter ranges in the North Pacific Ocean

    E-Print Network [OSTI]

    Wage, Kathleen

    Mode coherence at megameter ranges in the North Pacific Ocean Kathleen E. Wage, Matthew A and the Acoustical Society of America. #12;Mode coherence at megameter ranges in the North Pacific Ocean Kathleen E Thermometry of Ocean Climate ATOC and Alternate Source Test AST experiments. Vertical line arrays at Hawaii

  5. Near-field imaging of quantum cascade laser transverse modes

    E-Print Network [OSTI]

    . Lahrech, R. Bachelot, P. Gleyzes, and A. C. Boccara, "Infrared-reflection-mode near-field microscopy using: We report near field imaging of the transverse lasing modes of quantum cascade lasers. A mid-infrared. Nagar, G. Fish, K. Lieberman, G. Eisenstein, A. Lewis, J. M. Nielsen, and A. Møeller-Larsen, "Near-infrared

  6. New Equipartition Results for Normal Mode Energies of Anharmonic Chains

    E-Print Network [OSTI]

    Henry, Bruce Ian

    New Equipartition Results for Normal Mode Energies of Anharmonic Chains B.I. Henry 1 and T. Szeredi 2;3 Date: 26 September 1995 The canonical and micro­canonical distribution of energy among. If the inter­particle potential is an even function then energy is distributed uniformly among the normal modes

  7. Detecting gravity modes in the solar $^8B$ neutrino flux

    E-Print Network [OSTI]

    Ilídio Lopes; Sylvaine Turck-Chièze

    2014-08-28T23:59:59.000Z

    The detection of gravity modes produced in the solar radiative zone has been a challenge in modern astrophysics for more than 30 yr and their amplitude in the core is not yet determined. In this Letter, we develop a new strategy to look for standing gravity modes through solar neutrino fluxes. We note that due to a resonance effect, the gravity modes of low degree and low order have the largest impact on the $^{8}B$ neutrino flux. The strongest effect is expected to occur for the dipole mode with radial order $2$, corresponding to periods of about 1.5 hr. These standing gravity waves produce temperature fluctuations that are amplified by a factor of 170 in the boron neutrino flux for the corresponding period, in consonance with the gravity modes. From current neutrino observations, we determine that the maximum temperature variation due to the gravity modes in the Sun's core is smaller than $5.8\\times 10^{-4}$. This study clearly shows that due to their high sensitivity to the temperature, the $^8B$ neutrino flux time series is an excellent tool to determine the properties of gravity modes in the solar core. Moreover, if gravity mode footprints are discovered in the $^{8}B$ neutrino flux, this opens a new line of research to probe the physics of the solar core as non-standing gravity waves of higher periods cannot be directly detected by helioseismology but could leave their signature on boron neutrino or on other neutrino fluxes.

  8. October 6, 1997 ITER L-Mode Con nement Database

    E-Print Network [OSTI]

    October 6, 1997 ITER L-Mode Con nement Database S.M. Kaye and the ITER Con nement Database Working Group Abstract This paper describes the content of an L-mode database that has been compiled with data, and Tore-Supra. The database consists of a total of 2938 entries, 1881 of which are in the L-phase while

  9. On the quasinormal modes of the de Sitter spacetime

    E-Print Network [OSTI]

    A. Lopez-Ortega

    2012-07-29T23:59:59.000Z

    Modifying a method by Horowitz and Hubeny for asymptotically anti-de Sitter black holes, we establish the classical stability of the quasinormal modes of the de Sitter spacetime. Furthermore using a straightforward method we calculate the de Sitter quasinormal frequencies of the gravitational perturbations and discuss some properties of the radial functions of these quasinormal modes.

  10. Coherent Modes in the Acoustic Frequency Range in Tokamaks

    SciTech Connect (OSTI)

    Garbet, X.; Falchetto, G.; Ottaviani, M.; Sabot, R.; Sirinelli, A. [Association Euratom-CEA, CEA/DSM/DRFC CEA-Cadarache (France); Smolyakov, A. [Department of Physics and Engineering Physics, University of Saskatchewan, SK (Canada)

    2006-11-30T23:59:59.000Z

    This paper presents a kinetic study of Geodesic Acoustic Modes and Beta Alfven Eigenmodes. The dispersion relations of both modes are similar, which make them difficult to discriminate. However their poloidal structures and excitation mechanisms are different, thus providing a way to characterize them unambiguously. These results are briefly discussed in relation with reflectometry measurements on Tore Supra.

  11. Autoresonant ,,nonstationary... excitation of a collective nonlinear mode J. Fajansa)

    E-Print Network [OSTI]

    Gilson, Erik

    ; accepted 23 August 1999 The autoresonant nonlinear phase locking manipulation of the diocotron mode amplitude. Assume that the oscillator is ini- tially phase locked to its drive. In autoresonance, sweeping . For autoresonance to occur, the mode must phaselock with the drive. Normally, phase locking occurs automati- cally

  12. Temporal-Harmonic Specific POD Mode Extraction Gilead Tadmor

    E-Print Network [OSTI]

    Dabiri, John O.

    Temporal-Harmonic Specific POD Mode Extraction Gilead Tadmor and Daniel Bissex Electrical changes the systems mean field changes significantly, as does the leading shedding harmonic4 , once mode pair will capture harmonically rich time dynamics, reflecting a spatial mix of multiple vortical

  13. Hybrid Rossby-shelf modes in a laboratory Onno Bokhove

    E-Print Network [OSTI]

    Al Hanbali, Ahmad

    provided via the Ekman pumping and suction due to an oscillating rigid lid. Various forcing strengths have. The laboratory ocean consists of a deeper ocean, ac- commodating basin scale Rossby modes, and a coastal step exchange associated with hybrid modes between shallow coastal seas and deep ocean basins. 1 #12

  14. Localized radio frequency communication using asynchronous transfer mode protocol

    DOE Patents [OSTI]

    Witzke, Edward L. (Edgewood, NM); Robertson, Perry J. (Albuquerque, NM); Pierson, Lyndon G. (Albuquerque, NM)

    2007-08-14T23:59:59.000Z

    A localized wireless communication system for communication between a plurality of circuit boards, and between electronic components on the circuit boards. Transceivers are located on each circuit board and electronic component. The transceivers communicate with one another over spread spectrum radio frequencies. An asynchronous transfer mode protocol controls communication flow with asynchronous transfer mode switches located on the circuit boards.

  15. Mixed-mode oscillations in chemical systems Valery Petrov

    E-Print Network [OSTI]

    Showalter, Kenneth

    , leading to correspondingly more complete Devil's staircases. An ex- actly comparable scenario is shown. The relative extents of the mixed-mode and nonmixed- mode forms are summarized in terms of a Devil's staircase. The completeness of the staircase as a second parameter is varied is discussed. The mechanisms by which the system

  16. FAILURE MODES AND EFFECTS ANALYSIS Dated: May 27, 2010

    E-Print Network [OSTI]

    Princeton Plasma Physics Laboratory

    1 NSTX FAILURE MODES AND EFFECTS ANALYSIS (FMEA) Revision 7 Dated: May 27, 2010 Prepared By: Name.07.13 09:11:02 -04'00' #12;NSTX Failure Modes & Effects Analysis / NSTX-FMEA-71-7 / p. 2 of 120 2 Table

  17. Nonlinear evolution of resistive interchange modes in reversed field pinches

    SciTech Connect (OSTI)

    Schnack, D.D.; Killeen, J.

    1980-04-01T23:59:59.000Z

    The results are presented of the application of a two dimensional resistive MHD computer code to the nonlinear evolution of resistive interchange modes in tearing-mode-stable RFP equilibria. One finds that the m = 1 mode is insignificant when the singular surface is outside the field reversal point, and is more active nonlinearly but still fairly localized when the singular surface lies in the inner regions of the plasma. The m = 0 mode, which is not present in tokamaks, is found to lead to highly distorted flux surfaces and interchange vortices of large radial extent when ..beta.. is near the Suydam marginal point. However, if the initial ..beta.. is sufficiently small, this mode remains localized allowing significant Ohmic heating of the pinch to occur.

  18. Fluid modes of a spherically confined Yukawa plasma

    SciTech Connect (OSTI)

    Kaehlert, H.; Bonitz, M. [Institut fuer Theoretische Physik und Astrophysik, Christian-Albrechts Universitaet zu Kiel, 24098 Kiel (Germany)

    2010-09-15T23:59:59.000Z

    The normal modes of a three-dimensional Yukawa plasma in an isotropic harmonic confinement are investigated by solving the linearized cold fluid equations. The eigenmodes are found analytically and expressed in terms of hypergeometric functions. It is found that the mode frequencies solely depend on the dimensionless plasma parameter {xi}={kappa}R, where R is the plasma radius and {kappa} is the inverse screening length. The eigenfrequencies increase monotonically with {xi} and saturate in the limit {xi}{yields}{infinity}. Compared with the results in the Coulomb limit [D. H. E. Dubin, Phys. Rev. Lett. 66, 2076 (1991)], we find an additional class of modes characterized by the number n which determines the number of radial nodes in the perturbed potential. These modes originate from the degenerate bulk modes of the Coulomb system. Analytical formulas for the eigenfrequencies are derived for limiting cases.

  19. Mode identification of Pulsating White Dwarfs using the HST

    E-Print Network [OSTI]

    S. O. Kepler; E. L. Robinson; D. Koester; J. C. Clemens; R. E. Nather; X. J. Jiang

    2000-03-31T23:59:59.000Z

    We have obtained time-resolved ultraviolet spectroscopy for the pulsating DAV stars G226-29 and G185-32, and for the pulsating DBV star PG1351+489 with the Hubble Space Telescope Faint Object Spectrograph, to compare the ultraviolet to the optical pulsation amplitude and determine the pulsation indices. We find that for essentially all observed pulsation modes, the amplitude rises to the ultraviolet as the theoretical models predict for l=1 non-radial g-modes. We do not find any pulsation mode visible only in the ultraviolet, nor any modes whose phase flips by 180 degrees; in the ultraviolet, as would be expected if high l pulsations were excited. We find one periodicity in the light curve of G185-32, at 141 s, which does not fit theoretical models for the change of amplitude with wavelength of g-mode pulsations.

  20. Fast ion transport induced by saturated infernal mode

    SciTech Connect (OSTI)

    Marchenko, V. S., E-mail: march@kinr.kiev.ua [Institute for Nuclear Research, Kyiv (Ukraine)

    2014-05-15T23:59:59.000Z

    Tokamak discharges with extended weak-shear central core are known to suffer from infernal modes when the core safety factor approaches the mode ratio. These modes can cause an outward convection of the well-passing energetic ions deposited in the core by fusion reactions and/or neutral beam injection. Convection mechanism consists in collisional slowing down of energetic ions trapped in the Doppler-precession resonance with a finite-amplitude infernal mode. Convection velocity can reach a few m/s in modern spherical tori. Possible relation of this transport with the enhanced fast ion losses in the presence of “long lived modes” in the MAST tokamak [I. T. Chapman et al., Nucl. Fusion 50, 045007 (2010)] is discussed.

  1. Nonlinear dynamics of multiple neoclassical tearing modes in tokamaks

    SciTech Connect (OSTI)

    Chandra, D.; Sen, A. [Institute for Plasma Research, Bhat, Gandhinagar 382428 (India); Agullo, O.; Benkadda, S. [France-Japan Magnetic Fusion Lab, LIA 336, CNRS/Lab PIIM, UMR 6633, CNRS-Universite de Provence, 13397 Marseille (France); Garbet, X. [Association Euratom-CEA, DRFC, CEA Cadarache, 13108 St-Paul-Lez-Durance (France)

    2013-04-15T23:59:59.000Z

    Numerical simulations investigating the interaction of co-existent 2/1 and 3/1 neoclassical tearing modes are presented. The results obtained from an initial value 3D toroidal code that solves a set of generalized reduced MHD equations exhibit a host of complex phenomena arising from the coupling of the two modes. These include a modification of the island saturation widths of the two modes, a significant modification in the perpendicular flow patterns in the vicinity of the islands, and the excitation of geodesic acoustic mode like oscillations that lead to concomitant oscillations in the kinetic and magnetic energies of the islands. These oscillations only occur in the presence of the neoclassical stress tensor contribution and are absent for two coupled classical tearing modes.

  2. Tensor Modes in Bigravity: Primordial to Present

    E-Print Network [OSTI]

    Matthew Johnson; Alexandra Terrana

    2015-03-18T23:59:59.000Z

    Massive bigravity, a theoretically consistent modification of general relativity with an additional dynamical rank two tensor, successfully describes the observed accelerated expansion of the Universe without a cosmological constant. Recent analyses of perturbations around a cosmological background have revealed power law instabilities in both scalar and tensor perturbations, motivating an analysis of the initial conditions, evolution, and cosmological observables to determine the viability of these theories. In this paper we focus on the tensor sector, and study a primordial stochastic gravitational wave background in massive bigravity. The phenomenology can differ from standard General Relativity due to non-trivial mixing between the two linearized tensor fluctuations in the theory, only one of which couples to matter. We study perturbations about two classes of cosmological solutions in bigravity, computing the tensor contribution to the temperature anisotropies in the Cosmic Microwave Background radiation and the present stochastic gravitational wave background. The result is strongly dependent on the choice of cosmological background and initial conditions. One class of background solution generically displaying tremendous growth in the amplitude of large-wavelength gravitational waves, while the other remains observationally indistinguishable from standard General Relativity for a wide variety of initial conditions. We analyze the initial conditions for tensor modes expected in an inflationary cosmology, finding again that there is a strong dependence on the assumed background. For one choice of background, the semi-classical theory is beyond the perturbative regime. For the other choice, inflation generically yields initial conditions that, when evolved, give rise to a stochastic background observationally indistinguishable from standard General Relativity.

  3. Cavity mode entanglement in relativistic quantum information

    E-Print Network [OSTI]

    Nicolai Friis

    2014-05-05T23:59:59.000Z

    A central aim of relativistic quantum information (RQI) is the investigation of quantum information tasks and resources taking into account the relativistic aspects of nature. More precisely, it is of fundamental interest to understand how the storage, manipulation, and transmission of information utilizing quantum systems are influenced by the fact that these processes take place in a relativistic spacetime. In particular, many studies in RQI have been focused on the effects of non-uniform motion on entanglement, the main resource of quantum information protocols. Early investigations in this direction were performed in highly idealized settings that prompted questions as to the practical accessibility of these results. To overcome these limitations it is necessary to consider quantum systems that are in principle accessible to localized observers. In this thesis we present such a model, the rigid relativistic cavity, and its extensions, focusing on the effects of motion on entanglement and applications such as quantum teleportation. We study cavities in (1+1) dimensions undergoing non-uniform motion, consisting of segments of uniform acceleration and inertial motion of arbitrary duration that allow the involved velocities to become relativistic. The transitions between segments can be sharp or smooth and higher dimensions can be incorporated. The primary focus lies in the Bogoliubov transformations of the quantum fields, real scalar fields or Dirac fields, confined to the cavities. The Bogoliubov transformations change the particle content and the occupation of the energy levels of the cavity. We show how these effects generate entanglement between the modes of the quantum fields inside a single cavity for various initial states. The entanglement between several cavities, on the other hand, is degraded by the non-uniform motion, influencing the fidelity of tasks such as teleportation.

  4. Radio frequency-power and the ring-mode to red-mode transition in an inductively coupled plasma

    SciTech Connect (OSTI)

    Coffer, J. G.; Camparo, J. C. [Physical Sciences Laboratories, The Aerospace Corporation, P.O. Box 92957, Los Angeles, California 90009 (United States)

    2012-04-15T23:59:59.000Z

    The optical output of an alkali-metal inductively coupled plasma (alkali-ICP) plays an important role in both atomic magnetometers and atomic clocks, producing these devices' atomic signals through optical pumping. Unfortunately, though the alkali-ICP's optical pumping efficiency grows exponentially with temperature, at relatively high temperatures ({approx}140 deg. C) the discharge transitions from ''ring mode'' to ''red mode'', which is a spectral change in the plasma's output that corresponds broadly to a transition from ''good emission'' for optical pumping to ''poor emission.'' Recently, evidence has accumulated pointing to radiation trapping as the mechanism driving the ring-mode to red-mode transition, suggesting that the phenomenon is primarily linked to the alkali vapor's temperature. However, observations of the transition made in the 1960 s, demonstrating that the ICP temperature associated with the transition depended on rf-power, would appear to cast doubt on this mechanism. Here, we carefully investigate the influence of rf-power on the ring-mode to red-mode transition, finding that rf-power only affects the transition through discharge heating. Thus, the present work shows that the primary effect of rf-power on the ring-mode to red-mode transition can be understood in terms of the radiation trapping mechanism.

  5. Competition between modes with different axial structures in gyrotrons

    SciTech Connect (OSTI)

    Khutoryan, Eduard M. [O. Ya. Usikov Institute for Radiophysics and Electronics, 12, Proskura str., Kharkiv 61085 (Ukraine); Nusinovich, Gregory S.; Sinitsyn, Oleksandr V. [Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742-3511 (United States)

    2014-09-15T23:59:59.000Z

    This study was motivated by some experiments in which it was found that during the voltage rise, instead of expected excitation of a high-frequency parasitic mode, the excitation of a lower-frequency parasitic mode takes place in a certain range of voltages. For explaining this fact, the dependence of start currents of possible competing modes on the beam voltage was carried out in the cold-cavity approximation and by using the self-consistent approach. It was found that in the case of cavities, which consist of the combination of a section of constant radius waveguide and a slightly uptapered waveguide, these two approaches yield completely different results. Thus, experimentally observed excitation of the low-frequency parasitic mode can be explained by the self-consistent modification of the axial profile of the excited field, which has strong influence on the diffractive quality factor of competing modes. This modification is especially pronounced in the case of excitation of modes with many axial variations which can be excited in the region of beam interaction with the backward-wave component of such modes.

  6. Absorption Mode FT-ICR Mass Spectrometry Imaging

    SciTech Connect (OSTI)

    Smith, Donald F.; Kilgour, David P.; Konijnenburg, Marco; O'Connor, Peter B.; Heeren, Ronald M.

    2013-12-03T23:59:59.000Z

    Fourier transform ion cyclotron resonance mass spectrometry offers the highest mass resolving power for molecular imaging experiments. This high mass resolving power ensures that closely spaced peaks at the same nominal mass are resolved for proper image generation. Typically higher magnetic fields are used to increase mass resolving power. However, a gain in mass resolving power can also be realized by phase correction of the data for absorption mode display. In addition to mass resolving power, absorption mode offers higher mass accuracy and signal-to-noise ratio over the conventional magnitude mode. Here we present the first use of absorption mode for Fourier transform ion cyclotron resonance mass spectrometry imaging. The Autophaser algorithm is used to phase correct each spectrum (pixel) in the image and then these parameters are used by the Chameleon work-flow based data processing software to generate absorption mode ?Datacubes? for image and spectral viewing. Absorption mode reveals new mass and spatial features that are not resolved in magnitude mode and results in improved selected ion image contrast.

  7. The Role of Thermal Conduction in Tearing Mode Theory

    E-Print Network [OSTI]

    Connor, J W; Hastie, R J; Liu, Y Q

    2014-01-01T23:59:59.000Z

    The role of anisotropic thermal diffusivity on tearing mode stability is analysed in general toroidal geometry. A dispersion relation linking the growth rate to the tearing mode stability parameter, Delta, is derived. By using a resistive MHD code, modified to include such thermal transport, to calculate tearing mode growth rates, the dispersion relation is employed to determine Delta in situations with finite plasma pressure that are stabilised by favourable average curvature in a simple resistive MHD model. We also demonstrate that the same code can also be used to calculate the basis-functions [C J Ham, et al, Plasma Phys. Control. Fusion 54 (2012) 105014] needed to construct Delta.

  8. Characterization of superconducting radiofrequency breakdown by two-mode excitation

    SciTech Connect (OSTI)

    Eremeev, Grigory V. [JLAB, Newport News, VA (United States); Palczewski, Ari D. [JLAB, Newport News, VA (United States)

    2014-01-01T23:59:59.000Z

    We show that thermal and magnetic contributions to the breakdown of superconductivity in radiofrequency (RF) fields can be separated by applying two RF modes simultaneously to a superconducting surface. We develop a simple model that illustrates how mode-mixing RF data can be related to properties of the superconductor. Within our model the data can be described by a single parameter, which can be derived either from RF or thermometry data. Our RF and thermometry data are in good agreement with the model. We propose to use mode-mixing technique to decouple thermal and magnetic effects on RF breakdown of superconductors.

  9. Multiprocessor system with multiple concurrent modes of execution

    DOE Patents [OSTI]

    Ahn, Daniel; Ceze, Luis H; Chen, Dong; Gara, Alan; Heidelberger, Philip; Ohmacht, Martin

    2013-12-31T23:59:59.000Z

    A multiprocessor system supports multiple concurrent modes of speculative execution. Speculation identification numbers (IDs) are allocated to speculative threads from a pool of available numbers. The pool is divided into domains, with each domain being assigned to a mode of speculation. Modes of speculation include TM, TLS, and rollback. Allocation of the IDs is carried out with respect to a central state table and using hardware pointers. The IDs are used for writing different versions of speculative results in different ways of a set in a cache memory.

  10. Separating and combining single-mode and multimode optical beams

    DOE Patents [OSTI]

    Ruggiero, Anthony J; Masquelier, Donald A; Cooke, Jeffery B; Kallman, Jeffery S

    2013-11-12T23:59:59.000Z

    Techniques for combining initially separate single mode and multimode optical beams into a single "Dual Mode" fiber optic have been developed. Bi-directional propagation of two beams that are differentiated only by their mode profiles (i.e., wavefront conditions) is provided. The beams can be different wavelengths and or contain different modulation information but still share a common aperture. This method allows the use of conventional micro optics and hybrid photonic packaging techniques to produce small rugged packages suitable for use in industrial or military environments.

  11. Investigation of dominant spin wave modes by domain walls collision

    SciTech Connect (OSTI)

    Ramu, M.; Purnama, I.; Goolaup, S.; Chandra Sekhar, M.; Lew, W. S., E-mail: wensiang@ntu.edu.sg [School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore)

    2014-06-28T23:59:59.000Z

    Spin wave emission due to field-driven domain wall (DW) collision has been investigated numerically and analytically in permalloy nanowires. The spin wave modes generated are diagonally symmetric with respect to the collision point. The non-propagating mode has the highest amplitude along the middle of the width. The frequency of this mode is strongly correlated to the nanowire geometrical dimensions and is independent of the strength of applied field within the range of 0.1?mT to 1?mT. For nanowire with film thickness below 5?nm, a second spin wave harmonic mode is observed. The decay coefficient of the spin wave power suggests that the DWs in a memory device should be at least 300?nm apart for them to be free of interference from the spin waves.

  12. Sliding-mode amplitude control techniques for harmonic oscillators

    E-Print Network [OSTI]

    Marquart, Chad A.

    2007-09-17T23:59:59.000Z

    This thesis investigates both theoretical and implementation-level aspects of switching- feedback control strategies for the development of voltage-controlled oscillators. We use a modified sliding-mode compensation scheme based on various norms...

  13. Data sheet acquired from Harris Semiconductor Four Operating Modes

    E-Print Network [OSTI]

    Kretchmar, R. Matthew

    1 Data sheet acquired from Harris Semiconductor SCHS164F Features · Four Operating Modes - Shift Ld PDIP NOTE: When ordering, use the entire part number. The suffixes 96 and R denote tape and reel

  14. Gearbox Typical Failure Modes, Detection, and Mitigation Methods (Presentation)

    SciTech Connect (OSTI)

    Sheng, S.

    2014-01-01T23:59:59.000Z

    This presentation was given at the AWEA Operations & Maintenance and Safety Seminar and focused on what the typical gearbox failure modes are, how to detect them using detection techniques, and strategies that help mitigate these failures.

  15. On the Origin of the Outgoing Black Hole Modes

    E-Print Network [OSTI]

    Ted Jacobson

    1996-01-25T23:59:59.000Z

    The question of how to account for the outgoing black hole modes without drawing upon a transplanckian reservoir at the horizon is addressed. It is argued that the outgoing modes must arise via conversion from ingoing modes. It is further argued that the back-reaction must be included to avoid the conclusion that particle creation cannot occur in a strictly stationary background. The process of ``mode conversion" is known in plasma physics by this name and in condensed matter physics as ``Andreev reflection" or ``branch conversion". It is illustrated here in a linear Lorentz non-invariant model introduced by Unruh. The role of interactions and a physical short distance cutoff is then examined in the sonic black hole formed with Helium-II.

  16. A Sliding Mode Multimodel Control for a Sensorless Photovoltaic System

    E-Print Network [OSTI]

    Ahmed Rhif; Zohra Kardous; Naceur BenHadj Braiek

    2013-01-12T23:59:59.000Z

    In this work we will talk about a new control test using the sliding mode control with a nonlinear sliding mode observer, which are very solicited in tracking problems, for a sensorless photovoltaic panel. In this case, the panel system will has as a set point the sun position at every second during the day for a period of five years; then the tracker, using sliding mode multimodel controller and a sliding mode observer, will track these positions to make the sunrays orthogonal to the photovoltaic cell that produces more energy. After sunset, the tracker goes back to the initial position (which of sunrise). Experimental measurements show that this autonomic dual axis Sun Tracker increases the power production by over 40%.

  17. Large mode-volume, large beta, photonic crystal laser resonator

    SciTech Connect (OSTI)

    Dezfouli, Mohsen Kamandar; Dignam, Marc M. [Department of Physics, Engineering Physics and Astronomy, Queen’s University, Kingston, ON K7L 3N6 (Canada)

    2014-12-15T23:59:59.000Z

    We propose an optical resonator formed from the coupling of 13, L2 defects in a triangular-lattice photonic crystal slab. Using a tight-binding formalism, we optimized the coupled-defect cavity design to obtain a resonator with predicted single-mode operation, a mode volume five times that of an L2-cavity mode and a beta factor of 0.39. The results are confirmed using finite-difference time domain simulations. This resonator is very promising for use as a single mode photonic crystal vertical-cavity surface-emitting laser with high saturation output power compared to a laser consisting of one of the single-defect cavities.

  18. On the ordinary mode instability for low beta plasmas

    SciTech Connect (OSTI)

    Hadi, F.; Qamar, A. [Institute of Physics and Electronics, University of Peshawar, Peshawar (Pakistan); Bashir, M. F. [Department of Physics, G. C. University, Lahore (Pakistan); Salam Chair in Physics, G. C. University, Lahore (Pakistan); Yoon, P. H. [Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742-2431 (United States); School of Space Research, Kyung Hee University, Yongin (Korea, Republic of); Schlickeiser, R. [Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- and Astrophysik, Ruhr-Universität, Bochum (Germany)

    2014-05-15T23:59:59.000Z

    The purely growing ordinary (O) mode instability, first discussed by Davidson and Wu [Phys. Fluids 13, 1407 (1970)], has recently received renewed attention owing to its potential applicability to the solar wind plasma. In a series of papers, Ibscher, Schlickeiser, and their colleagues [Phys. Plasmas 19, 072116 (2012); ibid. 20, 012103 (2013); ibid. 20, 042121 (2013); ibid. 21, 022110 (2014)] revisited the O mode instability and extended it to the low-beta plasma regime by considering a counter-streaming bi-Maxwellian model. However, the O-mode instability is, thus, far discussed only on the basis of the marginal stability condition rather than actual numerical solutions of the dispersion relation. The present paper revisits the O-mode instability by considering the actual complex roots. The marginal stability condition as a function of the (electron) temperature anisotropy and beta naturally emerges in such a scheme.

  19. Goldstone modes in Lyapunov spectra of hard sphere systems

    E-Print Network [OSTI]

    Astrid S. de Wijn; Henk van Beijeren

    2004-04-29T23:59:59.000Z

    In this paper, we demonstrate how the Lyapunov exponents close to zero of a system of many hard spheres can be described as Goldstone modes, by using a Boltzmann type of approach. At low densities, the correct form is found for the wave number dependence of the exponents as well as for the corresponding eigenvectors in tangent-space. The predicted values for the Lyapunov exponents belonging to the transverse mode are within a few percent of the values found in recent simulations, the propagation velocity for the longitudinal mode is within 1%, but the value for the Lyapunov exponent belonging to the longitudinal mode deviates from the simulations by 30%. For higher densities, the predicted values deviate more from the values calculated in the simulations. These deviations may be due to contributions from ring collisions and similar terms, which, even at low densities, can contribute to the leading order.

  20. Josephson photonics with a two-mode superconducting circuit

    E-Print Network [OSTI]

    A. D. Armour; Björn Kubala; Joachim Ankerhold

    2015-03-02T23:59:59.000Z

    We analyze the quantum dynamics of two electromagnetic oscillators coupled in series to a voltage biased Josephson junction. When the applied voltage leads to a Josephson frequency across the junction which matches the sum of the two mode frequencies, tunneling Cooper pairs excite photons in both modes simultaneously leading to far-from-equilibrium states. These states display highly non-classical features including strong anti-bunching, violation of Cauchy-Schwartz inequalities, and number squeezing. The regimes of low and high photon occupancies allow for analytical results which are supported by a full numerical treatment. The impact of asymmetries between the two modes is explored, revealing a pronounced enhancement of number squeezing when the modes are damped at different rates.

  1. Dual sensitivity mode system for monitoring processes and sensors

    DOE Patents [OSTI]

    Wilks, Alan D. (Mount Prospect, IL); Wegerich, Stephan W. (Glendale Heights, IL); Gross, Kenneth C. (Bolingbrook, IL)

    2000-01-01T23:59:59.000Z

    A method and system for analyzing a source of data. The system and method involves initially training a system using a selected data signal, calculating at least two levels of sensitivity using a pattern recognition methodology, activating a first mode of alarm sensitivity to monitor the data source, activating a second mode of alarm sensitivity to monitor the data source and generating a first alarm signal upon the first mode of sensitivity detecting an alarm condition and a second alarm signal upon the second mode of sensitivity detecting an associated alarm condition. The first alarm condition and second alarm condition can be acted upon by an operator and/or analyzed by a specialist or computer program.

  2. Dose Rate Calculations for Rotary Mode Core Sampling Exhauster

    E-Print Network [OSTI]

    Foust, D J

    2000-01-01T23:59:59.000Z

    This document provides the calculated estimated dose rates for three external locations on the Rotary Mode Core Sampling (RMCS) exhauster HEPA filter housing, per the request of Characterization Field Engineering.

  3. Front propagation and mode-locking in Coupled Map Lattices

    E-Print Network [OSTI]

    Carretero, Ricardo

    of the travelling interface has a Devil's staircase (a fractal staircase) dependence on the coupling parameter. The Devil's staircase is mode-locked to rational plateaus and may be fully described via Farey sequences

  4. Gyrokinetic treatment of GAE modes in cylindrical geometry

    SciTech Connect (OSTI)

    Eremin, D. [Max-Plank-Institut fuer Plasmaphysik, EUROATOM-Association, D-17491 Greifswald (Germany)

    2006-11-30T23:59:59.000Z

    Global Alfven eigenmodes (GAEs) are investigated in cylindrical geometry both analytically and numerically. These modes are of particular importance in low-shear magnetic configurations, such as modern stellarators. Analytical treatment starts from the linearised equations of gyrokinetics and yields a generalized dispersion relation for GAE with FLR and kinetic effects taken into account, which is demonstrated to reduce to the well-known MHD counterpart in the appropriate limit. An eigenvalue code is developed to solve the dispersion relation, which is used to investigate the kinetic analogs of GAE modes in various regimes with different beta. On the other hand, GAE modes are simulated with global linear particle-in-cell (PIC) electromagnetic gyrokinetic code following self-consistent time evolution of electromagnetic fields and plasma. GAE modes are observed and their damping rate agrees with predictions made by the eigenvalue code.

  5. Zero sound modes in the AdS/CFT correspondence

    E-Print Network [OSTI]

    Roxlo, Thomas (Thomas Q.)

    2012-01-01T23:59:59.000Z

    We examine the effects of zero sound wave excitations of charged fermion species living around the charged black hole of an AdS/CFT spacetime. In particular, we show that these bulk modes cause corresponding singularities ...

  6. A mechanical mode-stirred reverberation chamber with chaotic geometry

    E-Print Network [OSTI]

    Gabriele Gradoni; Franco Moglie; Valter Mariani Primiani

    2014-07-06T23:59:59.000Z

    A previous research on multivariate approach to the calculation of reverberation chamber correlation matrices is used to calculate the number of independent positions in a mode-stirred reverberation chamber. Anomalies and counterintuitive behavior are observed in terms of number of correlated matrix elements with respect to increasing frequency. This is ascribed to the regular geometry forming the baseline cavity (screened room) of a reverberation chamber, responsible for localizing energy and preserving regular modes (bouncing ball modes). Smooth wall deformations are introduced in order to create underlying Lyapunov instability of rays and then destroy survived regular modes. Numerical full-wave simulations are performed for a reverberation chamber with corner hemispheres and (off-)center wall spherical caps. Field sampling is performed by moving a mechanical carousel stirrer. It is found that wave-chaos inspired baseline geometries improve chamber performances in terms of lowest usable frequencies and number of independent cavity realizations of mechanical stirrers.

  7. Mode conversation losses in overmolded millimeter wave transmission lines

    E-Print Network [OSTI]

    Tax, David S. (David Samuel)

    2008-01-01T23:59:59.000Z

    Millimeter wave transmission lines are integral components for many important applications like nuclear fusion and NMR spectroscopy. In low loss corrugated transmission lines propagating the HE,1 mode with a high waveguide ...

  8. Specifying mode requirements of embedded systems Graeme Smith

    E-Print Network [OSTI]

    Smith, Graeme

    Specifying mode requirements of embedded systems Graeme Smith Software Verification Research Centre University of Queensland, Australia Email: smith@svrc.uq.edu.au Abstract This paper presents a formal

  9. Detecting individual gravity modes in the Sun: Chimera or reality?

    E-Print Network [OSTI]

    Garcia, Rafael A; Eff-Darwich, A; Garrido, R; Jimenez, A; Mathis, S; Mathur, S; Moya, A; Palle, P L; Regulo, C; Salabert, D; Sato, K; Suarez, J C; Turck-Chieze, S

    2009-01-01T23:59:59.000Z

    Over the past 15 years, our knowledge of the interior of the Sun has tremendously progressed by the use of helioseismic measurements. However, to go further in our understanding of the solar core, we need to measure gravity (g) modes. Thanks to the high quality of the Doppler-velocity signal measured by GOLF/SoHO, it has been possible to unveil the signature of the asymptotic properties of the solar g modes, thus obtaining a hint of the rotation rate in the core. However, the quest for the detection of individual g modes is not yet over. In this work, we apply the latest theoretical developments to guide our research using GOLF velocity time series. In contrary to what was thought till now, we are maybe starting to identify individual low-frequency g modes...

  10. Spectrally tailored supercontinuum generation from single-mode-fiber amplifiers

    SciTech Connect (OSTI)

    Hao, Qiang; Guo, Zhengru; Zhang, Qingshan [Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System (Ministry of Education), School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093 (China); Liu, Yang; Li, Wenxue [State Key Laboratory of Precision Spectroscopy, East China Normal University, 3663 Zhongshan North Road, Shanghai 200062 (China); Zeng, Heping, E-mail: hpzeng@phy.ecnu.edu.cn [Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System (Ministry of Education), School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093 (China); State Key Laboratory of Precision Spectroscopy, East China Normal University, 3663 Zhongshan North Road, Shanghai 200062 (China)

    2014-05-19T23:59:59.000Z

    Spectral filtering of an all-normal-dispersion Yb-doped fiber laser was demonstrated effective for broadband supercontinuum generation in the picosecond time region. The picosecond pump pulses were tailored in spectrum with 1 nm band-pass filter installed between two single-mode fiber amplifiers. By tuning the spectral filter around 1028?nm, four-wave mixing was initiated in a photonic crystal fiber spliced with single-mode fiber, as manifested by the simultaneous generation of Stokes wave at 1076?nm and anti-Stokes wave at 984?nm. Four-wave mixing took place in cascade with the influence of stimulated Raman scattering and eventually extended the output spectrum more than 900?nm of 10?dB bandwidth. This technique allows smooth octave supercontinuum generation by using simple single-mode fiber amplifiers rather than complicated multistage large-mode-area fiber amplifiers.

  11. Multifrequency Imaging in the Intermittent Contact Mode of Atomic...

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

    of the intermittent-contact (IC) 1-4 and noncontact (NC) 5 modes of atomic force micro- scopy (AFM) has opened a pathway towards high-resolution nondestructive imaging of...

  12. Charging system with galvanic isolation and multiple operating modes

    DOE Patents [OSTI]

    Kajouke, Lateef A.; Perisic, Milun; Ransom, Ray M.

    2013-01-08T23:59:59.000Z

    Systems and methods are provided for operating a charging system with galvanic isolation adapted for multiple operating modes. A vehicle charging system comprises a DC interface, an AC interface, a first conversion module coupled to the DC interface, and a second conversion module coupled to the AC interface. An isolation module is coupled between the first conversion module and the second conversion module. The isolation module comprises a transformer and a switching element coupled between the transformer and the second conversion module. The transformer and the switching element are cooperatively configured for a plurality of operating modes, wherein each operating mode of the plurality of operating modes corresponds to a respective turns ratio of the transformer.

  13. Mode competition in superradiant scattering of matter waves

    SciTech Connect (OSTI)

    Vogt, Thibault; Lu Bo; Liu Xinxing; Xu Xu; Zhou Xiaoji; Chen Xuzong [School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 (China)

    2011-05-15T23:59:59.000Z

    Superradiant Rayleigh scattering in a Bose gas released from an optical lattice is analyzed with incident light pumping at the Bragg angle for resonant light diffraction. We show that competition between superradiance scattering into the Bragg mode and into end-fire modes clearly leads to suppression of the latter at even relatively low lattice depths. A quantum light-matter interaction model is proposed for qualitatively explaining this result.

  14. Electromagnetic quasinormal modes of an asymptotically Lifshitz black hole

    E-Print Network [OSTI]

    A. Lopez-Ortega

    2014-06-01T23:59:59.000Z

    Motivated by the recent interest in the study of the spacetimes that are asymptotically Lifshitz and in order to extend some previous results, we calculate exactly the quasinormal frequencies of the electromagnetic field in a D-dimensional asymptotically Lifshitz black hole. Based on the values obtained for the quasinormal frequencies we discuss the classical stability of the quasinormal modes. We also study whether the electromagnetic field possesses unstable modes in the D-dimensional Lifshitz spacetime.

  15. Collective modes in multiband superfluids and superconductors: Multiple dynamical classes

    SciTech Connect (OSTI)

    Ota, Yukihiro [CCSE, Japan Atomic Energy Agency, Higashi-Ueno, Tokyo 110-0015 (Japan); CREST (JST), Honcho, Kawaguchi, Saitama 332-0012 (Japan); Machida, Masahiko [CCSE, Japan Atomic Energy Agency, Higashi-Ueno, Tokyo 110-0015 (Japan); CREST (JST), Honcho, Kawaguchi, Saitama 332-0012 (Japan) and JST, TRIP, Sanbancho, Tokyo 102-0075 (Japan); Koyama, Tomio [CREST (JST), Honcho, Kawaguchi, Saitama 332-0012 (Japan) and Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577 (Japan); Aoki, Hideo [JST, TRIP, Sanbancho, Tokyo 102-0075 (Japan); Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033 (Japan)

    2011-02-01T23:59:59.000Z

    One important way to characterize the states having a gauge symmetry spontaneously broken over multibands is to look at their collective excitation modes. We find that a three-band system has multiple Leggett modes with significantly different masses, which can be classified into different dynamical classes according to whether multiple interband Josephson currents add or cancel. This provides a way to dynamically characterize multiband superconductivity while the pairing symmetry is a static property.

  16. Multi mode nano scale Raman echo quantum memory

    E-Print Network [OSTI]

    S. A. Moiseev; E. S. Moiseev

    2010-01-31T23:59:59.000Z

    Low loss magnetic surface plasmon polariton (SPP) modes characterized by enhanced electrical field component and subwavelength confinement on the dielectric and negative-index metamaterial interface are presented. We demonstrate a possibility of storage and perfect retrieval of the low loss magnetic SPP fields by using a photon echo quantum memory on Raman atomic transition. We describe specific properties of the proposed technique which opens a possibility for efficient nano scale multi-mode quantum memory.

  17. Significance of the modes of occurrence of arsenic in coal

    SciTech Connect (OSTI)

    Ruppert, L.F. [Geological Survey, Reston, VA (United States); Hower, J.C. [Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research; Eble, C.F. [Kentucky Geological Survey, Lexington, KY (United States)

    1995-12-31T23:59:59.000Z

    Although modes of occurrence can be determined with a variety of techniques, electron microscopy allows documentation and quantification of trace elements in mineral phases. In these studies, the authors have used scanning electron and electron-beam microscopy to analyze pyrite grains in coal samples that contain high arsenic and to determine its mode of occurrence. Information obtained from these studies may prove valuable in predicting and modeling the fate of arsenic in coal utilization.

  18. Analysis of azimuthal mode dynamics of mesoscale eddies

    E-Print Network [OSTI]

    McCalpin, John David

    1984-01-01T23:59:59.000Z

    Rossby wave modes. The results appear to be in excellent qualitative agree- ment with Fli erl's (1977) analytic solutions. But the real advantage to numerical simulation is in the application to nonlinear models and arbitrary initial conditions. Mc...Wi lli ams and Fli erl ( 1979) presented the results of an extensive parameter survey using their two-mode non- linear quasigeostrophic model. The primary result is that nonlinear processes impede dispersion in intense vortices, so that friction be...

  19. Tsunami response at Wake Island: azimuthal mode analysis

    E-Print Network [OSTI]

    Creswell, Wiltie Austin

    1987-01-01T23:59:59.000Z

    TSUNAMI RESPONSE AT WAKE ISLAND: AZIMUTIIAL MODE ANALYSIS A Thesis by WILTIE AUSTIN CRESWELL III Submitted to the Graduate College of Texas AkM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... December 1987 Major Subject: Oceanography TSUNAMI RESPONSE AT WAKE ISLAND: AZIMUTHAL MODE ANALYSIS A Thesis by WILTIE AUSTIN CRESWELL III Approved as to style and content by: Andrew C. Vastano (Chairman of Committee) Robert O. Reid (Member) Guy...

  20. Higher Order Mode Heating Analysis for the ILC Superconducting Linacs

    SciTech Connect (OSTI)

    Bane, K.L.F.; Nantista, C.; Adolphsen, C.; /SLAC; ,

    2010-10-27T23:59:59.000Z

    The superconducting cavities and interconnects in the 11 km long linacs of the International Linear Collider (ILC) are designed to operate at 2K, where cooling costs are very expensive. It is thus important to minimize cryogenic heat loads. In addition to an unavoidable static load and the dynamic load of the fundamental 1.3 GHz accelerating rf, a further heat source is presented by the higher order mode (HOM) power deposited by the beam. Such modes will be damped by specially designed HOM couplers attached to the cavities (for trapped modes), and by ceramic dampers at 70K that are located between the eight or nine cavity cryomodules (for propagating modes). Brute force calculation of the higher frequency modes excited in a string of cryomodules is limited by computing capacity (see, e.g. [1]). M. Liepe has calculated {approx} 400 longitudinal TM modes in 3 superconducting cavities plus absorbers, up to 8 GHz [2]. Joestingmeier, et al., have used a ray tracing calculation to find the effect at higher frequencies, specifically in the range of tens of GHz and above [3]. In this report we present a scattering matrix approach, which we apply to an rf unit comprising 26 cavities and 3 absorbers. We perform calculations at sample frequencies (up to 20 GHz) to predict the effectiveness of the ceramic dampers in limiting HOM heat deposition at 2K.

  1. Method to calibrate fission chambers in Campbelling mode

    SciTech Connect (OSTI)

    Benoit Geslot; Troy C. Unruh; Philippe Filliatre; Christian Jammes; Jacques Di Salvo; Stéphane Bréaud; Jean-François Villard

    2011-06-01T23:59:59.000Z

    Fission chambers are neutron detectors which are widely used to instrument experimental reactors such as material testing reactors or zero power reactors. In the presence of a high level mixed gamma and neutron flux, fission chambers can be operated in Campbelling mode (also known as 'fluctuation mode' or 'mean square voltage mode') to provide reliable and precise neutron related measurements. Fission chamber calibration in Campbelling mode (in terms of neutron flux) is usually done empirically using a calibrated reference detector. A major drawback of this method is that calibration measurements have to be performed in a neutron environment very similar to the one in which the calibrated detector will be used afterwards. What we propose here is a different approach based on characterizing the fission chamber response in terms of fission rate. This way, the detector calibration coefficient is independent from the neutron spectrum and can be determined prior to the experiment. The fissile deposit response to the neutron spectrum can then be assessed independently by other means (experimental or numerical). In this paper, the response of CEA made miniature fission chambers in Campbelling mode is studied. We use a theoretical model of the signal to calculate the calibration coefficient. Input parameters of the model come from statistical distribution of individual pulses. Supporting measurements have been made in the CEA Cadarache zero power reactor MINERVE. Results are compared to an empirical Campbelling mode calibration.

  2. Mode dependent lattice thermal conductivity of single layer graphene

    SciTech Connect (OSTI)

    Wei, Zhiyong; Yang, Juekuan; Bi, Kedong; Chen, Yunfei, E-mail: yunfeichen@seu.edu.cn [Jiangsu Key Laboratory for Design and Manufacture of Micro/Nano Biomedical Instruments and School of Mechanical Engineering, Southeast University, Nanjing 210096 (China)

    2014-10-21T23:59:59.000Z

    Molecular dynamics simulation is performed to extract the phonon dispersion and phonon lifetime of single layer graphene. The mode dependent thermal conductivity is calculated from the phonon kinetic theory. The predicted thermal conductivity at room temperature exhibits important quantum effects due to the high Debye temperature of graphene. But the quantum effects are reduced significantly when the simulated temperature is as high as 1000?K. Our calculations show that out-of-plane modes contribute about 41.1% to the total thermal conductivity at room temperature. The relative contribution of out-of-plane modes has a little decrease with the increase of temperature. Contact with substrate can reduce both the total thermal conductivity of graphene and the relative contribution of out-of-plane modes, in agreement with previous experiments and theories. Increasing the coupling strength between graphene and substrate can further reduce the relative contribution of out-of-plane modes. The present investigations also show that the relative contribution of different mode phonons is not sensitive to the grain size of graphene. The obtained phonon relaxation time provides useful insight for understanding the phonon mean free path and the size effects in graphene.

  3. E-Print Network 3.0 - automotive switch-mode audio Sample Search...

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

    advantages and problems when implementing direct energy conversion switching-mode audio power... on a direct-conversion switching-mode audio power ampli- ... Source: Ris National...

  4. E-Print Network 3.0 - a-mode ultrasound devices Sample Search...

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

    Mode (A-mode) Ultrasound Imaging... Laboratory www.apl.washington.eduaboutabout.php 2008 Mike Bailey Method and Device to Use Ultrasound... to Evaluate Prosthetic Sockets...

  5. E-Print Network 3.0 - alfven cascade modes Sample Search Results

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

    results for: alfven cascade modes Page: << < 1 2 3 4 5 > >> 1 Kinetic theory of geodesic acoustic and related modes Summary: in toroidal geometry. Coupled to the...

  6. Integration of Failure Modes and Effects Analysis (FMEA) in the Engineering Design Process.

    E-Print Network [OSTI]

    Wen, Hua-wei

    2013-01-01T23:59:59.000Z

    ??ABSTRACT Integration of Failure Modes and Effects Analysis (FMEA) in the Engineering Design Process Hua-wei Wen Failure modes and effects analysis (FMEA) is one of… (more)

  7. Topological modes bound to dislocations in mechanical metamaterials

    E-Print Network [OSTI]

    Jayson Paulose; Bryan Gin-ge Chen; Vincenzo Vitelli

    2014-06-12T23:59:59.000Z

    Mechanical metamaterials are artificial structures with unusual properties, such as negative Poisson ratio, bistability or tunable vibrational properties, that originate in the geometry of their unit cell. At the heart of such unusual behaviour is often a soft mode: a motion that does not significantly stretch or compress the links between constituent elements. When activated by motors or external fields, soft modes become the building blocks of robots and smart materials. Here, we demonstrate the existence of topological soft modes that can be positioned at desired locations in a metamaterial while being robust against a wide range of structural deformations or changes in material parameters. These protected modes, localized at dislocations, are the mechanical analogue of topological states bound to defects in electronic systems. We create physical realizations of the topological modes in prototypes of kagome lattices built out of rigid triangular plates. We show mathematically that they originate from the interplay between two Berry phases: the Burgers vector of the dislocation and the topological polarization of the lattice. Our work paves the way towards engineering topologically protected nano-mechanical structures for molecular robotics or information storage and read-out.

  8. Lyapunov modes in three-dimensional Lennard-Jones fluids

    E-Print Network [OSTI]

    M. Romero-Bastida; E. Braun

    2008-07-15T23:59:59.000Z

    Recent studies on the phase-space dynamics of a one-dimensional Lennard-Jones fluid reveal the existence of regular collective perturbations associated with the smallest positive Lyapunov exponents of the system, called hydrodynamic Lyapunov modes, which previously could only be identified in hard-core fluids. In this work we present a systematic study of the Lyapunov exponents and Lyapunov vectors, i.e. perturbations along each direction of phase space, of a three-dimensional Lennard-Jones fluid. By performing the Fourier transform of the spatial density of the coordinate part of the Lyapunov vector components and then time-averaging this result we find convincing signatures of longitudinal modes, with inconclusive evidence of transverse modes for all studied densities. Furthermore, the longitudinal modes can be more clearly identified for the higher density values. Thus, according to our results, the mixing of modes induced both by the dynamics and the dimensionality induce a hitherto unknown type of order in the tangent space of the model herein studied at high density values.

  9. Interaction of fast particles and Alfven modes in burning plasmas

    SciTech Connect (OSTI)

    Vlad, G.; Briguglio, S.; Fogaccia, G.; Zonca, F. [Associazione EURATOM-ENEA, CR ENEA-Frascati, Via E. Fermi 45, 00044 Frascati (Rome) (Italy)

    2006-11-30T23:59:59.000Z

    In this paper we study the interaction of fast particles with Alfvenic instabilities in Tokamak plasmas, with reference to present-day experiments that exploit strong energetic particle heating (namely, JT-60U) and the consistency of proposed ITER burning plasma scenarios. Concerning JT-60U, two different types of bursting modes have been observed by MHD spectrography in auxiliary heated (NNB) discharges. One of these modes has been dubbed fast frequency sweeping (fast FS) mode. It is characterized by a timescale of the order of few milliseconds and frequencies branching upwards and downwards. The other mode, called the abrupt large-amplitude event (ALE), has shorter timescale (order of hundred microseconds) and larger amplitude. On the occurrence of ALEs, a significant reduction of the neutron emission rate in the central plasma region is observed. Such a change has been attributed to a redistribution of the energetic ions, with a marked reduction of their on-axis density. We present an interpretation of these experimental observations, based on the results of nonlinear particle simulations performed by the Hybrid MHD-Gyrokinetic Code HMGC.Concerning ITER, monotonic-q (scenario 2) and reversed-shear (scenario 4) equilibria are considered. Also an ITER hybrid scenario is examined and quantitatively compared with the previous ones. The transition from the low-amplitude Alfvenic instability saturation to the secondary excitation of a stronger mode is addressed, and its effect on the energetic particle transport analyzed.

  10. Single-mode nonclassicality criteria via Holstein-Primakoff transformation

    E-Print Network [OSTI]

    Tasgin, Mehmet Emre

    2015-01-01T23:59:59.000Z

    Recently, two quantifications for nonclassicality of a single-mode field are shown to be equivalent; (i) the rank of entanglement it can generate by a beam-splitter and (ii) the number of terms needed to expand it as superposition of coherent states. We show that nonclassicality criteria can be obtained with an alternative approach. The rank of two-mode entanglement among 2-level identical particles converges to the rank of single-mode nonclassicality within the Holstein-Primakoff transformation, at the large particle number limit. In particular, we show that the entanglement criterion of Hillery & Zubairy converges to the Mandel's $Q$-parameter which is used to reveal nonclassicality, and spin-squeezing criterion of S{\\o}rensen et al. converges to single-mode squeezing condition. We obtain additional nonclassicality criteria not existing in the literature. We also discuss if single-mode nonclassicality can be visualized as the entanglement of space generating the photons. Moreover, in a forthcoming study...

  11. Effects of a random spatial variation of the plasma density on the mode conversion in cold, unmagnetized, and stratified plasmas

    SciTech Connect (OSTI)

    Jung Yu, Dae [School of Space Research, Kyung Hee University, Yongin 446-701 (Korea, Republic of)] [School of Space Research, Kyung Hee University, Yongin 446-701 (Korea, Republic of); Kim, Kihong [Department of Energy Systems Research, Ajou University, Suwon 443-749 (Korea, Republic of)] [Department of Energy Systems Research, Ajou University, Suwon 443-749 (Korea, Republic of)

    2013-12-15T23:59:59.000Z

    We study the effects of a random spatial variation of the plasma density on the mode conversion of electromagnetic waves into electrostatic oscillations in cold, unmagnetized, and stratified plasmas. Using the invariant imbedding method, we calculate precisely the electromagnetic field distribution and the mode conversion coefficient, which is defined to be the fraction of the incident wave power converted into electrostatic oscillations, for the configuration where a numerically generated random density variation is added to the background linear density profile. We repeat similar calculations for a large number of random configurations and take an average of the results. We obtain a peculiar nonmonotonic dependence of the mode conversion coefficient on the strength of randomness. As the disorder increases from zero, the maximum value of the mode conversion coefficient decreases initially, then increases to a maximum, and finally decreases towards zero. The range of the incident angle in which mode conversion occurs increases monotonically as the disorder increases. We present numerical results suggesting that the decrease of mode conversion mainly results from the increased reflection due to the Anderson localization effect originating from disorder, whereas the increase of mode conversion of the intermediate disorder regime comes from the appearance of many resonance points and the enhanced tunneling between the resonance points and the cutoff point. We also find a very large local enhancement of the magnetic field intensity for particular random configurations. In order to obtain high mode conversion efficiency, it is desirable to restrict the randomness close to the resonance region.

  12. Transverse Mode Coupling Instability with chromaticity and space charge

    SciTech Connect (OSTI)

    Balbekov, V. [Fermi National Accelerator Laboratory, Batavia, IL (United States)

    2014-10-29T23:59:59.000Z

    Transverse mode coupling instability is considered in the paper at different bunch and wake shapes. Exact solution for “hollow” bunch is arrived at and used to develop a proper technique for more realistic distributions. The three-modes approach is proposed for arbitrary bunch with chromaticity included. It is shown that the TMCI threshold and rate depend only slightly on the bunch model used being rather sensitive to the wake shape. Resistive wall wake is considered in detail, and a comparison of the TMCI and collective mode instability with this wake is performed. Space charge tune shift of arbitrary value is included in the consideration providing a firm bridge between the known cases of absent and dominating space charge

  13. Novel variational approach for photonic crystal slab mode calculation

    E-Print Network [OSTI]

    Aram, Mohammad Hasan

    2015-01-01T23:59:59.000Z

    We propose a new method based on variational principle for analysis of photonic crystal (PC) slabs. Most of the methods used today treat PC slab as a three-dimensional (3D) crystal and this makes them very time and/or memory consuming. In this method we use Bloch theorem to expand the field on infinite plane waves which their amplitudes depend on the component perpendicular to the slab surface. By approximating these amplitudes with appropriate functions, we can find modes of PC slabs almost as fast as we can find modes of a two-dimensional (2D) crystal. Besides this advantage, we can also calculate radiation modes with this method which is not feasible with 3D Plane Wave Expansion (PWE) method.

  14. Oscillation modes of dc microdischarges with parallel-plate geometry

    E-Print Network [OSTI]

    Stefanovi?, Ilija; Škoro, Nikola; Mari?, Dragana; Petrovi?, Zoran Lj; Winter, Jörg

    2011-01-01T23:59:59.000Z

    Two different oscillation modes in microdischarge with parallel-plate geometry has been observed: relaxation oscillations with frequency range between 1.23 and 2.1 kHz and free-running oscillations with 7 kHz frequency. The oscillation modes are induced by increasing power supply voltage or discharge current. For a given power supply voltage, there is a spontaneous transition from one to other oscillation mode and vice versa. Before the transition from relaxation to free-running oscillations, the spontaneous increase of oscillation frequency of relaxation oscillations form 1.3 kHz to 2.1 kHz is measured. Fourier Transform Spectra of relaxation oscillations reveal chaotic behaviour of microdischarge. Volt-Ampere characteristics associated with relaxation oscillations describes periodical transition between low current, diffuse discharge and normal glow. However, free-running oscillations appear in subnormal glow only.

  15. MHD Turbulence: Properties of Alfven, Slow and Fast Modes

    E-Print Network [OSTI]

    A. Lazarian; A. Beresnyak

    2005-05-29T23:59:59.000Z

    We summarise basic properties of MHD turbulence. First, MHD turbulence is not so messy as it is believed. In fact, the notion of strong non-linear coupling of compressible and incompressible motions along MHD cascade is not tenable. Alfven, slow and fast modes of MHD turbulence follow their own cascades and exhibit degrees of anisotropy consistent with theoretical expectations. Second, the fast decay of turbulence is not related to the compressibility of fluid. Rates of decay of compressible and incompressible motions are very similar. Third, the properties of Alfven and slow modes are similar to their counterparts in the incompressible MHD. The properties of fast modes are similar to accoustic turbulence, which does require more studies. Fourth, the density at low Mach numbers and logarithm of density at higher Mach numbers exhibit Kolmogorov-type spectrum.

  16. Collective modes in a Dirac insulator with short range interactions

    E-Print Network [OSTI]

    Xi Luo; Yue Yu; Long Liang

    2015-03-06T23:59:59.000Z

    We study a Haldane model with nearest neighbor interactions. We find one-dimensional like collective modes arising due to the interplay of pseudo-spin and valley degrees of freedom. In the large band gap or moderate interaction limit, these excitations are low energy modes lying in the band gap. The dispersion relations are qualitatively different in trivial insulator phase and Chern insulator phase, thus can be used to identify the topology of the Haldane model with the bulk property. We also discuss how to detect these modes in cold atom systems. An abelian gauge theory will emerge when a physical current-current interaction is introduced to the Haldane model or the Kane-Mele model.

  17. Scissors mode of Gd nuclei studied from resonance neutron capture

    SciTech Connect (OSTI)

    Kroll, J.; Baramsai, B.; Becker, J. A. [Charles University in Prague, CZ-180 00 Prague 8 (Czech Republic); North Carolina State University, Raleigh, NC 27695 (United States) and Triangle Universities Nuclear Laboratory, Durham, NC 27708 (United States); and others

    2012-10-20T23:59:59.000Z

    Spectra of {gamma} rays following the neutron capture at isolated resonances of stable Gd nuclei were measured. The objectives were to get new information on photon strength of {sup 153,155-159}Gd with emphasis on the role of the M1 scissors-mode vibration. An analysis of the data obtained clearly indicates that the scissors mode is coupled not only to the ground state, but also to all excited levels of the nuclei studied. The specificity of our approach ensures unbiasedness in estimating the sumed scissors-mode strength {Sigma}B(M1){up_arrow}, even for odd product nuclei, for which conventional nuclear resonance fluorescence measurements yield only limited information. Our analysis indicates that for these nuclei the sum {Sigma}B(M1){up_arrow} increases with A and for {sup 157,159}Gd it is significantly higher compared to {sup 156,158}Gd.

  18. Polarization Properties of A Multi-Moded Concentrator

    E-Print Network [OSTI]

    Kogut, A; Hill, R S

    2015-01-01T23:59:59.000Z

    We present the design and performance of a non-imaging concentrator for use in broad-band polarimetry at millimeter through submillimeter wavelengths. A rectangular geometry preserves the input polarization state as the concentrator couples f/2 incident optics to a 2 pi sr detector. Measurements of the co-polar and cross-polar beams in both the few-mode and highly over-moded limits agree with a simple model based on mode truncation. The measured co-polar beam pattern is nearly independent of frequency in both linear polarizations. The cross-polar beam pattern is dominated by a uniform term corresponding to polarization efficiency 94%. After correcting for efficiency, the remaining cross-polar response is -18 dB.

  19. Disentangling defects and sound modes in disordered solids

    E-Print Network [OSTI]

    Sven Wijtmans; M. Lisa Manning

    2015-02-05T23:59:59.000Z

    We develop a new method to isolate localized defects from extended vibrational modes in disordered solids. This method augments particle interactions with an artificial potential that acts as a high-pass filter: it preserves small-scale structures while pushing extended vibrational modes to higher frequencies. The low-frequency modes that remain are "bare" defects; they are exponentially localized without the quadrupolar tails associated with elastic interactions. We identify a robust definition for the energy barrier associated with each defect, which is an important parameter in continuum models for plasticity. Surprisingly, we find that the energy barriers associated with "bare" defects are generally higher than those for defects decorated with elastic tails, suggesting that elastic interactions may help to constitutively activate particle rearrangements.

  20. The galactic double-mode Cepheids I. Frequency analysis of the light curves and comparison with single-mode Cepheids

    E-Print Network [OSTI]

    Ennio Poretti; Ilaria Pardo

    1996-12-05T23:59:59.000Z

    We submitted the available photometric V data of all the known galactic Double Mode Cepheids (DMCs) to a careful frequency analysis with the aim of detecting in each case the importance of the harmonics and of the cross coupling terms. For each object, starting from different data subsets, we progressively built a homogenous set of data, checking the consistency of the results step by step. It was demonstrated that each star displays a different content, showing that no a priori fit can be applied. Up to 4 harmonics were found for the fundamental radial mode (F); in every case, 2 harmonics were found for the first overtone radial mode (1 O). We also proceeded to a preliminar analysis of the Fourier parameters of the DMC light curves and we found a very close similarity between i) the light curves of the Classical Cepheids and those of the F-mode of the DMCs; ii) the light curves of the s-Cepheids and those of the 1 O-mode of the DMCs. The analysis of DMC light curves offers the possibility of unifying the light curves of Classical and s-Cepheids. The case of the unique DMC CO Aur is also discussed.

  1. Wavelength meter having single mode fiber optics multiplexed inputs

    DOE Patents [OSTI]

    Hackel, R.P.; Paris, R.D.; Feldman, M.

    1993-02-23T23:59:59.000Z

    A wavelength meter having a single mode fiber optics input is disclosed. The single mode fiber enables a plurality of laser beams to be multiplexed to form a multiplexed input to the wavelength meter. The wavelength meter can provide a determination of the wavelength of any one or all of the plurality of laser beams by suitable processing. Another aspect of the present invention is that one of the laser beams could be a known reference laser having a predetermined wavelength. Hence, the improved wavelength meter can provide an on-line calibration capability with the reference laser input as one of the plurality of laser beams.

  2. An optical cavity with a strongly focused mode

    SciTech Connect (OSTI)

    Durak, Kadir; Victor, Leong Xu Heng; Huan, Nguyen Chi; Maslennikov, Gleb; Kurtsiefer, Christian [NUS, Center for Quantum Technologies/Physics Dept, 3 Science Drive 2, 117543 (Singapore); Straupe, Stanislav [NUS, Center for Quantum Technologies/Physics Dept, 3 Science Drive 2, 117543, Singapore and Faculty of Physics, Moscow State University (Russian Federation)

    2013-12-16T23:59:59.000Z

    Atom-photon interfaces are one of the building blocks of the future quantum information protocols. Accomplishing a strong interaction between the atom and the photons can be successfully done by high finesse and small mode volume cavities. However, this method requires sophisticated dielectric coatings and stabilization of the cavity against even small vibrations and small line width of those cavities impose higher input photon numbers if spontaneously emitted photons are to be used, which make it seem hard to scale up such atom-light interfaces to form quantum networks. An alternative method is to use a nearly concentric cavity, which has a strongly focused optical mode.

  3. Spin-one color superconductors: collective modes and effective Lagrangian

    E-Print Network [OSTI]

    Jin-yi Pang; Tomas Brauner; Qun Wang

    2010-10-11T23:59:59.000Z

    We investigate the collective excitations in spin-one color superconductors. We classify the Nambu--Goldstone modes by the pattern of spontaneous symmetry breaking, and then use the Ginzburg--Landau theory to derive their dispersion relations. These soft modes play an important role for the low-energy dynamics of the system such as the transport phenomena and hence are relevant for late-stage evolution of neutron stars. In the case of the color-spin-locking phase, we use a functional technique to obtain the low-energy effective action for the physical Nambu--Goldstone bosons that survive after gauging the color symmetry.

  4. Geiger-Mode Avalanche Photodiodes in Particle Detection

    E-Print Network [OSTI]

    E. Vilella; O. Alonso; J. Trenado; A. Vilà; M. Vos; L. Garrido; A. Diéguez

    2012-01-27T23:59:59.000Z

    It is well known that avalanche photodiodes operated in the Geiger mode above the breakdown voltage offer a virtually infinite sensitivity and time accuracy in the picosecond range that can be used for single photon detection. However, their performance in particle detection remains still unexplored. In this contribution, we are going to expose the different steps that we have taken in order to prove the efficiency of Geiger mode avalanche photodiodes in the aforementioned field. In particular, we will present an array of pixels of 1mmx1mm fabricated with a standard CMOS technology for characterization in a test beam.

  5. Purcell factor of Mie resonators featuring electric and magnetic modes

    E-Print Network [OSTI]

    Zambrana-Puyalto, Xavier

    2015-01-01T23:59:59.000Z

    We present a modal approach to compute the Purcell factor in Mie resonators exhibiting both electric and magnetic resonances. The analytic expressions of the normal modes are used to calculate the effective volumes. We show that important features of the effective volume can be predicted thanks to the translation-addition coefficients of a displaced dipole. Using our formalism, it is easy to see that, in general, the Purcell factor of Mie resonators is not dominated by a single mode, but rather by a large superposition. Finally we consider a silicon resonator homogeneously doped with electric dipolar emitters, and we show that the average electric Purcell factor dominates over the magnetic one.

  6. Are "EIT Waves" Fast-Mode MHD Waves?

    E-Print Network [OSTI]

    M. J. Wills-Davey; C. E. DeForest; J. O. Stenflo

    2007-04-23T23:59:59.000Z

    We examine the nature of large-scale, coronal, propagating wave fronts (``EIT waves'') and find they are incongruous with solutions using fast-mode MHD plane-wave theory. Specifically, we consider the following properties: non-dispersive single pulse manifestions, observed velocities below the local Alfven speed, and different pulses which travel at any number of constant velocities, rather than at the ``predicted'' fast-mode speed. We discuss the possibility of a soliton-like explanation for these phenomena, and show how it is consistent with the above-mentioned aspects.

  7. Damping of Neutron Star Shear Modes by Superfluid Friction

    E-Print Network [OSTI]

    P. B. Jones

    2003-01-07T23:59:59.000Z

    The forced motion of superfluid vortices in shear oscillations of rotating solid neutron star matter produces damping of the mode. A simple model of the unpinning and repinning processes is described, with numerical calculations of the consequent energy decay times. These are of the order of 1 s or more for typical anomalous X-ray pulsars but become very short for the general population of radio pulsars. The superfluid friction processes considered here may also be significant for the damping of r-modes in rapidly rotating neutron stars.

  8. Beyond standard two-mode dynamics in bosonic Josephson junctions

    SciTech Connect (OSTI)

    Julia-Diaz, B.; Polls, A. [Departament d'Estructura i Constituents de la Materia, Universitat de Barcelona, E-08028 Barcelona (Spain); Institut de Ciencies del Cosmos, Universitat de Barcelona, E-08028 Barcelona (Spain); Martorell, J.; Mele-Messeguer, M. [Departament d'Estructura i Constituents de la Materia, Universitat de Barcelona, E-08028 Barcelona (Spain)

    2010-12-15T23:59:59.000Z

    We examine the dynamics of a Bose-Einstein condensate in a symmetric double-well potential for a broad range of nonlinear couplings. We demonstrate the existence of a region, beyond those of Josephson oscillations and self-trapping, which involves the dynamical excitation of the third mode of the double-well potential. We develop a simple semiclassical model for the coupling between the second and third modes that describes very satisfactorily the full time-dependent dynamics. Experimental conditions are proposed to probe this phenomenon.

  9. Can a spectator scalar field enhance inflationary tensor mode?

    E-Print Network [OSTI]

    Tomohiro Fujita; Jun'ichi Yokoyama; Shuichiro Yokoyama

    2014-11-13T23:59:59.000Z

    We consider the possibility of enhancing the inflationary tensor mode by introducing a spectator scalar field with a small sound speed which induces gravitational waves as a second order effect. We analytically obtain the power spectra of gravitational waves and curvature perturbation induced by the spectator scalar field. We found that the small sound speed amplifies the curvature perturbation much more than the tensor mode and the current observational constraint forces the induced gravitational waves to be negligible compared with those from the vacuum fluctuation during inflation.

  10. Schmidt modes in the angular spectrum of bright squeezed vacuum

    E-Print Network [OSTI]

    Polina R. Sharapova; Angela M. Perez; Olga V. Tikhonova; Maria V. Chekhova

    2014-10-24T23:59:59.000Z

    We study the spatial properties of high-gain parametric down-conversion (PDC). From the Hamiltonian we find the Schmidt modes, apply the Bloch-Messiah reduction, and calculate analytically the measurable quantities, such as the angular distributions of photon numbers and photon-number correlations. Our approach shows that the Schmidt modes of PDC radiation can be considered the same as for the low-gain (biphoton) case while the Schmidt eigenvalues strongly depend on the parametric gain. Its validity is confirmed by comparison with several experimental results, obtained by us and by other groups.

  11. Wavelength meter having single mode fiber optics multiplexed inputs

    DOE Patents [OSTI]

    Hackel, Richard P. (Livermore, CA); Paris, Robert D. (San Ramon, CA); Feldman, Mark (Pleasanton, CA)

    1993-01-01T23:59:59.000Z

    A wavelength meter having a single mode fiber optics input is disclosed. The single mode fiber enables a plurality of laser beams to be multiplexed to form a multiplexed input to the wavelength meter. The wavelength meter can provide a determination of the wavelength of any one or all of the plurality of laser beams by suitable processing. Another aspect of the present invention is that one of the laser beams could be a known reference laser having a predetermined wavelength. Hence, the improved wavelength meter can provide an on-line calibration capability with the reference laser input as one of the plurality of laser beams.

  12. Wind Turbine Gearbox Failure Modes - A Brief (Presentation)

    SciTech Connect (OSTI)

    Sheng, S.; McDade, M.; Errichello, R.

    2011-10-01T23:59:59.000Z

    Wind turbine gearboxes are not always meeting 20-year design life. Premature failure of gearboxes increases cost of energy, turbine downtime, unplanned maintenance, gearbox replacement and rebuild, and increased warranty reserves. The problem is widespread, affects most Original Equipment Manufacturers, and is not caused by manufacturing practices. There is a need to improve gearbox reliability and reduce turbine downtime. The topics of this presentation are: GRC (Gearbox Reliability Collaborative) technical approach; Gearbox failure database; Recorded incidents summary; Top failure modes for bearings; Top failure modes for gears; GRC test gearbox; Bearing nomenclature; Test history; Real damage; Gear sets; Bearings; Observations; and Summary. 5 refs.

  13. Tungsten Transport in JET H-mode Plasmas in Hybrid Scenario, Experimental Observations and Modelling

    E-Print Network [OSTI]

    Tungsten Transport in JET H-mode Plasmas in Hybrid Scenario, Experimental Observations and Modelling

  14. Failure Modes of Vacuum Plasma Spray Tungsten Coating Created on Carbon Fibre Composites under Thermal Loads

    E-Print Network [OSTI]

    Failure Modes of Vacuum Plasma Spray Tungsten Coating Created on Carbon Fibre Composites under Thermal Loads

  15. Origin of the high-energy Raman modes in single-wall carbon nanotubes

    E-Print Network [OSTI]

    Nabben, Reinhard

    Origin of the high-energy Raman modes in single-wall carbon nanotubes J. Maultzsch, C. Thomsen, S nanotubes. Similar to the disorder-induced D mode, the high-energy modes are deter- mined by double of the first-order high-energy Raman modes in carbon nanotubes has been a puzzling question since the first

  16. Northwest Energy Innovations (TRL 5 6 System)- WETNZ MtiMode Wave Energy Converter Advancement Project

    Broader source: Energy.gov [DOE]

    Northwest Energy Innovations (TRL 5 6 System) - WETNZ MtiMode Wave Energy Converter Advancement Project

  17. Measurement of Coupling PDC photon sources with single-mode and multimode optical fibers

    E-Print Network [OSTI]

    Hart, Gus

    Measurement of Coupling PDC photon sources with single-mode and multimode optical fibers Stefania the coupling efficiency of parametric downconversion light (PDC) into single and multi-mode optical fibers models for the preparation and collection of either single-mode or multi-mode PDC light (defined by

  18. Design of Mixed-mode Adaptive Loop Gain Bang-Bang Clock and Data Recovery and Process-Variation-Resilient Current Mode Logic

    E-Print Network [OSTI]

    Jeon, Hyung-Joon

    2013-03-19T23:59:59.000Z

    ) and Current Mode Logic (CML). This dissertation proposes a mixed-mode adaptive loop gain Bang-Bang CDR. The proposed CDR enhances jitter performances even if jitter spectrum information is limited a priori. By exploiting the inherent hard...

  19. 702 IEEEJOURNAL OF QUAKTUM ELECTRONICS OCTOBER phases of the q pump modes. asis the single pass power loss of the

    E-Print Network [OSTI]

    Teich, Malvin C.

    power loss of the signal modes, and allidler modes are assumed to have the same single pass loss ai. K

  20. Phosphate single mode large mode area all-solid photonic crystal fiber with multi-watt output power

    SciTech Connect (OSTI)

    Wang, Longfei; He, Dongbing; Yu, Chunlei; Hu, Lili; Chen, Danping, E-mail: dpchen2008@aliyun.com [Key Laboratory of High Power Laser Materials, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Liu, Hui [Navigation Staff Room, Anhui Bengbu Petty Officer Academy of Navy, Bengbu 233000 (China); Qiu, Jianrong [Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641 (China)

    2014-03-31T23:59:59.000Z

    An index-depressed active core, single-mode phosphate all-solid large-mode-area photonic crystal fiber (PCF) is theoretically investigated using full-vectorial finite difference approach and experimentally realized. The PCF has a maximum output power of 5.4?W and 31% slope efficiency. Single-mode operation is realized through PCFs with core diameters of 30, 35, and 40??m, respectively. The beam quality is not degraded even at maximum output power. Our simulations and experiments reveal that the laser performance is significantly affected by the center-to-center distance between the two nearest rods ?, the rod diameter d, and their ratio d/?, implying that much attention should be given in employing optimal parameters to achieve excellent laser performance.

  1. Energy Efficient Multi-mode Operation for Networked Wireless Sensors

    E-Print Network [OSTI]

    Jay Yang, Shanchieh

    Energy Efficient Multi-mode Operation for Networked Wireless Sensors Shanchieh Jay Yang, Niranjan Krishnamurthi, Cory D. Cress and Moises Sudit Rochester Institute of Technology, Rochester, NY 14623 Abstract of research work, ranging from device en- gineering to network protocol design, have been initiated to address

  2. Operator's Manual Cell Imaging Multi-Mode Reader

    E-Print Network [OSTI]

    Doering, Tamara

    . 4 On the keyboard, press CTRL+SHIFT+M to enter maintenance mode for the Dispenser 1 window. 5 Enter Center with any questions, tac@biotek.com. Dispenser 1 calibration values Dispenser 2 calibration values or reliability of software or equipment that is not supplied by BioTek or its affiliated dealers. Bio

  3. Sliding Mode Control of EV Electric Differential System

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of an electric differential system for Electric Vehicle (EV) with two induction motor drives (one for each wheel of electric drives to control the generated torque and the introduction of an independent control400 1 Sliding Mode Control of EV Electric Differential System A. Haddoun, M. E. H. Benbouzid, D

  4. EVALUATION OF COMPONENT MODE SYNTHESIS METHODS FOR THE

    E-Print Network [OSTI]

    Boyer, Edmond

    EVALUATION OF COMPONENT MODE SYNTHESIS METHODS FOR THE DETECTION OF MODAL INTERACTION THROUGH ROTOR 2009 Abstract The study of interactions through direct contact between blade-tips and outer casings where friction is accounted for. This method offers energy momentum conserving which is a critical point

  5. Fundamental oscillation modes of neutron stars: validity of universal relations

    E-Print Network [OSTI]

    Chirenti, Cecilia; Kastaun, Wolfgang

    2015-01-01T23:59:59.000Z

    We study the $f$-mode frequencies and damping times of nonrotating neutron stars (NS) in general relativity (GR) by solving the linearized perturbation equations, with the aim to establish "universal" relations that depend only weakly on the equations of state (EOS). Using a more comprehensive set of EOSs, we re-examine some proposed linearizations that describe the $f$-mode parameters in terms of mass and radius of the neutron star (NS), and we test a more recent proposal for expressing the $f$-mode parameters as quadratic functions of the effective compactness. Our extensive results for each equation of state considered allow us to study the accuracy of each proposal. In particular, we find that the damping time deviates quite considerably from the proposed linearization. We introduce a new universal relation for the product of the $f$-mode frequency and damping time as a function of the (ordinary) compactness, which proved to be more accurate. The relations using the effective compactness on the other hand...

  6. Energy Minimization in Cooperative Relay Networks with Sleep Modes

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    . To minimize the total energy consumption, working modes of RNs and power allocation need to be optimized dominates the total energy consumption only when the transmission range is long. As wireless net- works consumption model, the total energy con- sumption consists of transmission energy and circuit energy

  7. Stress Induced Degradation Modes in CIGSS Minimodules (Presentation)

    SciTech Connect (OSTI)

    Kempe, M. D.; Terwilliger, K.; Tarrant, D.

    2008-05-01T23:59:59.000Z

    The experimental objectives of this report are: (1) compare the performance of modules exposed to high temperature and humidity; (2) determine the effects of different encapsulants on long term stability of CIGSS modules; and (3) analyze failure modes to determine areas in need of improvement.

  8. Subharmonic autoresonance of the diocotron mode* L. Friedland

    E-Print Network [OSTI]

    Gilson, Erik

    accelerators,1 molecular physics,2,3 nonlinear dynamics,4 nonlinear waves,5,6 and fluid dynamics.7 Recently, we This paper investigates the excitation and control of the driven l 1 diocotron mode in a pure electron plasma by adiabatic passage through higher order resonances. The excitation takes place when the driving frequency d

  9. SHIFTING MODES? TRANSPORTATION AND URBAN DEVELOPMENT PATTERNS IN

    E-Print Network [OSTI]

    Kammen, Daniel M.

    Shares (%) ­ Journey to Work, US (varies by region) Drive alone Carpool Transit Walk #12;More data Elizabeth Deakin Professor of City and Regional Planning University of California, Berkeley March 5, 2011 & saving energy in transport via mode shifts? Prospects for the future #12;I - Factors affecting travel

  10. Quasinormal modes of D-dimensional de Sitter spacetime

    E-Print Network [OSTI]

    A. López-Ortega

    2006-11-02T23:59:59.000Z

    We calculate the exact values of the quasinormal frequencies for an electromagnetic field and a gravitational perturbation moving in $D$-dimensional de Sitter spacetime ($D \\geq 4$). We also study the quasinormal modes of a real massive scalar field and we compare our results with those of other references.

  11. Oddelek za ziko Normal modes in the atmosphere

    E-Print Network [OSTI]

    Â?umer, Slobodan

    weather prediction. In section 3 I concentrate on the normal modes of a very simple model, shallow water #12;Numerical weather prediction is an initial condition problem. That means we need ini- tial-gravity waves just play their role, but in numerical models of the atmosphere, they can cause huge problems. 1

  12. CRYOGENIC SYSTEM FOR CONTINUOUS ULTRAHIGH HYDROGEN PURIFICATION IN CIRCULATION MODE

    E-Print Network [OSTI]

    Kammel, Peter

    1 CRYOGENIC SYSTEM FOR CONTINUOUS ULTRAHIGH HYDROGEN PURIFICATION IN CIRCULATION MODE A. Vasilyev1 (Circulation Hydrogen Ultrahigh Purification System) is designed to solve these two tasks: providing, the total level of all contaminants (water, nitrogen, oxygen etc.) has to be lower than 0.01 ppm. Hydrogen

  13. Kinetic Properties of Alfven Modes in Tokamak Plasmas

    SciTech Connect (OSTI)

    Lauber, Ph.; Guenter, S.; Bruedgam, M. [Max-Planck-Institut fuer Plasmaphysik, EURATOM-Association, D-85748 Garching (Germany); Koenies, A. [Max-Planck Institut fuer Plasmaphysik, EURATOM-Association, D-17489 Greifswald (Germany); Pinches, S. D. [UKAEA Fusion Association Culham Science Centre, Abingdon, Oxfordshire OX143DB (United Kingdom)

    2006-11-30T23:59:59.000Z

    The ability to predict the stability of fast-particle-driven Alfven eigenmodes in burning fusion plasmas requires a detailed understanding of the dissipative mechanisms that damp these modes. In order to address this question, the linear gyro-kinetic, electromagnetic code LIGKA is employed to investigate their behaviour in realistic tokamak geometry. The eigenvalue formulation of LIGKA allows to calculate self-consistently the coupling of large-scaled MHD modes to the gyroradius scale-length kinetic Alfven waves. Therefore, the properties of the kineticly modified TAE mode in or near the gap (KTAE, radiative damping or 'tunnelling') and its coupling to the continuum close to the edge can be analysed numerically. In addition, an antenna-like version of LIGKA allows for a frequency scan, analogous to an external antenna.The model and the implementation of LIGKA were recently extended in order to capture the coupling of the shear Alfven waves to the sound waves. This coupling becomes important for the investigation of kinetic effects on the low-frequency phase of cascade modes, where e.g. geodesic acoustic effects play a significant role.

  14. Review of Mode-Conversion Calculations in Toroidal Plasmasy

    E-Print Network [OSTI]

    Jaun, André

    Institute of Technology SE-100 44 Stockholm, Sweden y work performed during a visit at CRPP, september 1999 ABSTRACT. Recent developments in the gyrokinetic modeling of drift-, Alfv´en and Bernstein waves allow-hybrid resonances where mode-conversion is possible; the power absorption can however not cor- rectly be determined

  15. Review of ModeConversion Calculations in Toroidal Plasmas y

    E-Print Network [OSTI]

    Jaun, André

    Institute of Technology SE­100 44 Stockholm, Sweden y work performed during a visit at CRPP, september 1999 ABSTRACT. Recent developments in the gyrokinetic modeling of drift­, Alfvâ??en and Bernstein waves allow­hybrid resonances where mode­conversion is possible; the power absorption can however not cor­ rectly be determined

  16. Molecular Cell Mode of Regulation and the Insulation

    E-Print Network [OSTI]

    Molecular Cell Article Mode of Regulation and the Insulation of Bacterial Gene Expression Vered.molcel.2012.04.032 SUMMARY A gene can be said to be insulated from environ- mental variations if its the insulation of the lac promoter of E. coli and of synthetic constructs in which the transcription factor CRP

  17. FRACTAL DIMENSION ESTIMATION: EMPIRICAL MODE DECOMPOSITION VERSUS WAVELETS

    E-Print Network [OSTI]

    Gonçalves, Paulo

    FRACTAL DIMENSION ESTIMATION: EMPIRICAL MODE DECOMPOSITION VERSUS WAVELETS Paulo Gonc¸alves INRIA, France. {firstname.lastname}@ens-lyon.fr ABSTRACT We address the problem of fractal dimension estimation motions. Index Terms-- fractal dimension, regularity exponents, wavelet transform, EMD 1. MOTIVATION

  18. CALCULATION OF THE NEUTRON NOISE INDUCED BY SHELL-MODE

    E-Print Network [OSTI]

    Demazière, Christophe

    CALCULATION OF THE NEUTRON NOISE INDUCED BY SHELL-MODE FISSION REACTORS CORE-BARREL VIBRATIONS-REGION SLAB REACTOR MODEL CARL SUNDE,* CHRISTOPHE DEMAZI�RE, and IMRE PÁZSIT Chalmers University of Technology for Publication October 12, 2005 The subject of this paper is the calculation of the in-core neutron noise induced

  19. Array E PCU Failure Modes, Effects and Criticality Analysis ,...

    E-Print Network [OSTI]

    Rathbun, Julie A.

    , this circuit would automatically switch power to the redundant unit. 2. 2 INVERTER MODULE ,· The Inverter the Failure Modes, Effect and Criticality Analysis on the Bendix designed Power Con- ditioning Unit resulted in IOOo/o success on all previ- ous arrays plus the following new features: I. Complete Redundancy

  20. Absorption cross-section 139 Accumulation mode, of aerosol 146

    E-Print Network [OSTI]

    Jacob, Daniel J.

    133, 151 residence times 153 size distributions 144 Air composition 2 molecular weight 4, 6 Albedo 122 dioxide Coagulation (aerosol) 146 Column model 32 Conditional unstability 56 Continuity equation 75261 INDEX A Absorption cross-section 139 Accumulation mode, of aerosol 146 Acetaldehyde (CH3CHO

  1. Localized mode interactions in 0-Josephson junctions Hadi Susanto1

    E-Print Network [OSTI]

    Wirosoetisno, Djoko

    Localized mode interactions in 0- Josephson junctions Hadi Susanto1 and Gianne Derks2 1 School of Mathematics, University of Surrey, Guildford, Surrey, GU2 7XH, UK A long Josephson junction containing regions in the system, it is shown that Josephson junctions with phase-shift can be an ideal setting for studying

  2. Critical {delta}{sup '} for stability of viscoresistive tearing modes

    SciTech Connect (OSTI)

    Grasso, D.; Hastie, R. J.; Porcelli, F. [Burning Plasma Research Group, Dipartimento di Energetica, Politecnico di Torino, Torino (Italy); Tebaldi, C. [Burning Plasma Research Group, Dipartimento di Energetica, Politecnico di Torino, Torino (Italy); Dipartimento di Matematica, Politecnico di Torino, Torino (Italy)

    2008-07-15T23:59:59.000Z

    An analytic expression for the stability threshold of linear tearing modes is derived. The magnetized plasma is described in terms of a standard viscoresistive magnetohydrodynamic model. The analytic derivation requires an extension of the standard layer equation that represents an approximation of the full model in the vicinity of the reconnecting layer. The analytic result is checked against numerical simulations, showing excellent agreement.

  3. NO. ~EV. NO. Failure Modes and Effects Analysis -LRRR

    E-Print Network [OSTI]

    Rathbun, Julie A.

    of the Failure Modes and Effects Analysis (FMEA) is to discover critical failure areas in the LRRR experiment for the critical failure areas. A TM 868 contains the results of a final FMEA for the LRRR experiment. 2. 0 SUMMARY Since an LRRR was successfully deployed on the moon as a part of the Apollo 11 mission, this FMEA

  4. Failure Modes and Effects Analysis 300 Array -LRRR

    E-Print Network [OSTI]

    Rathbun, Julie A.

    of the Failure Modes and Effects Analysis (FMEA) is to discover critical failure areas in a system and to remove failure areas. 1. 2 This memo contains the results of the final FMEA for the 300 Array LRRR experiment was successfully deployed on the moon as a part of the Apollo 11 mission, this FMEA will not dwell in the aspects

  5. Axisymmetric oscillation modes of a double droplet system

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

    Ramalingam, Santhosh K.; Basaran, Osman A.

    2010-11-15T23:59:59.000Z

    A double droplet system (DDS) consists of a sessile and a pendant drop that are coupled through a liquid filled cylindrical hole in a plate of thickness d. For a small hole radius R, equilibrium shapes of both drops are sections of spheres. While DDSs have a number of applications in microfluidics, a DDS oscillating about its equilibrium state can be used as a fast focusing liquid lens. Here, a DDS consisting of an isothermal, incompressible Newtonian fluid of constant density p and constant viscosity u that is surrounded by a gas is excited by oscillating in time (a) the pressure in the gas surrounding either drop (pressure excitation), (b) the plate perpendicular to its plane (axial excitation), and (c) the hole radius (radial excitation). In contrast to previous works that assumed transient drop shapes are spherical, they are determined here by simulation and used to identify the natural modes of axisymmetric oscillations from resonances observed during frequency sweeps with DDSs for which the combined volume V of the two drops is less than (4/3)?R3. Pressure and axial excitations are found to have identical responses but axial and radial excitations are shown to excite different modes. These modes are compared to those exhibited by single pendant (sessile) drop systems. In particular, while a single pendant (sessile) drop has one additional oscillation mode compared to a free drop, a DDS is found to exhibit roughly twice as many oscillation modes as a pendant (sessile) drop. The effects of dimensionless volume V/R3, dimensionless plate thickness d/R, and Ohnesorge number Oh =?/??R? , where ? is the surface tension of the DDS-gas interface, on the resonance frequencies are also investigated.

  6. Axisymmetric oscillation modes of a double droplet system

    SciTech Connect (OSTI)

    Ramalingam, Santhosh K.; Basaran, Osman A.

    2010-11-15T23:59:59.000Z

    A double droplet system (DDS) consists of a sessile and a pendant drop that are coupled through a liquid filled cylindrical hole in a plate of thickness d. For a small hole radius R, equilibrium shapes of both drops are sections of spheres. While DDSs have a number of applications in microfluidics, a DDS oscillating about its equilibrium state can be used as a fast focusing liquid lens. Here, a DDS consisting of an isothermal, incompressible Newtonian fluid of constant density p and constant viscosity u that is surrounded by a gas is excited by oscillating in time (a) the pressure in the gas surrounding either drop (pressure excitation), (b) the plate perpendicular to its plane (axial excitation), and (c) the hole radius (radial excitation). In contrast to previous works that assumed transient drop shapes are spherical, they are determined here by simulation and used to identify the natural modes of axisymmetric oscillations from resonances observed during frequency sweeps with DDSs for which the combined volume V of the two drops is less than (4/3)?R3. Pressure and axial excitations are found to have identical responses but axial and radial excitations are shown to excite different modes. These modes are compared to those exhibited by single pendant (sessile) drop systems. In particular, while a single pendant (sessile) drop has one additional oscillation mode compared to a free drop, a DDS is found to exhibit roughly twice as many oscillation modes as a pendant (sessile) drop. The effects of dimensionless volume V/R3, dimensionless plate thickness d/R, and Ohnesorge number Oh =?/??R? , where ? is the surface tension of the DDS-gas interface, on the resonance frequencies are also investigated.

  7. Energy of eigen-modes in magnetohydrodynamic flows of ideal fluids

    E-Print Network [OSTI]

    I. V. Khalzov; A. I. Smolyakov; V. I. Ilgisonis

    2007-12-11T23:59:59.000Z

    Analytical expression for energy of eigen-modes in magnetohydrodynamic flows of ideal fluids is obtained. It is shown that the energy of unstable modes is zero, while the energy of stable oscillatory modes (waves) can assume both positive and negative values. Negative energy waves always correspond to non-symmetric eigen-modes -- modes that have a component of wave-vector along the equilibrium velocity. These results suggest that all non-symmetric instabilities in ideal MHD systems with flows are associated with coupling of positive and negative energy waves. As an example the energy of eigen-modes is calculated for incompressible conducting fluid rotating in axial magnetic field.

  8. Tools for detecting entanglement between different degrees of freedom in quadrature squeezed cylindrically polarized modes

    E-Print Network [OSTI]

    Christian Gabriel; Andrea Aiello; Stefan Berg-Johansen; Christoph Marquardt; Gerd Leuchs

    2011-12-15T23:59:59.000Z

    Quadrature squeezed cylindrically polarized modes contain entanglement not only in the polarization and spatial electric field variables but also between these two degrees of freedom [1]. In this paper we present tools to generate and detect this entanglement. Experimentally we demonstrate the generation of quadrature squeezing in cylindrically polarized modes by mode transforming a squeezed Gaussian mode. Specifically, -1.2 dB of amplitude squeezing are achieved in the radially and azimuthally polarized mode. Furthermore, theoretically it is shown how the entanglement contained within these modes can be measured and how strong the quantum correlations, depending on the measurement scheme, are.

  9. Manipulating microwaves with magnetic-dipolar-mode vortices

    SciTech Connect (OSTI)

    Kamenetskii, E. O.; Sigalov, M.; Shavit, R. [Department of Electrical and Computer Engineering, Ben Gurion University of the Negev, IL-84 105 Beer Sheva (Israel)

    2010-05-15T23:59:59.000Z

    There has been a surge of interest in the subwavelength confinement of electromagnetic fields. It is well known that, in optics, subwavelength confinement can be obtained from surface plasmon (quasielectrostatic) oscillations. In this article, we propose to realize subwavelength confinement in microwaves by using dipolar-mode (quasimagnetostatic) magnon oscillations in ferrite particles. Our studies of interactions between microwave electromagnetic fields and small ferrite particles with magnetic-dipolar-mode (MDM) oscillations show strong localization of electromagnetic energy. MDM oscillations in a ferrite disk are at the origin of topological singularities resulting in Poynting vector vortices and symmetry breakings of the microwave near fields. We show that new subwavelength microwave structures can be realized based on a system of interacting MDM ferrite disks. Wave propagation of electromagnetic signals in such structures is characterized by topological phase variations. Interactions of microwave fields with an MDM ferrite disk and MDM-disk arrays open a perspective for creating engineered electromagnetic fields with unique symmetry properties.

  10. How does color neutrality affect collective modes in color superconductors?

    E-Print Network [OSTI]

    Hiroaki Abuki; TomᚠBrauner

    2012-03-08T23:59:59.000Z

    We revisit the issue of color neutrality in effective model descriptions of dense quark matter based on global color symmetry. While the equilibrium thermodynamics of such models is now well understood, we examine the collective modes, focusing on the fluctuations of the order parameter. We point out that the constraint of color neutrality must be carefully generalized in order to obtain physically consistent and well-defined results. Particularly important is that the collective modes associated with order parameter fluctuations couple to charge density fluctuations in the neutral medium. We start by proving explicitly that, in contrast to claims made previously in literature, Nambu-Goldstone bosons of spontaneously broken global color symmetry remain exactly massless even after imposing the color neutrality constraint. As the next step, we make the argument general by using effective field theory. We then employ the high-density approximation to calculate the couplings in the effective Lagrangian and thus the Nambu-Goldstone boson dispersion relations.

  11. Staggered fermions, zero modes, and flavor-singlet mesons

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

    Donald, Gordon C.; Davies, Christine T.H.; Follana, Eduardo; Kronfeld, Andreas S.

    2011-09-12T23:59:59.000Z

    We examine the taste structure of eigenvectors of the staggered-fermion Dirac operator. We derive a set of conditions on the eigenvectors of modes with small eigenvalues (near-zero modes), such that staggered fermions reproduce the t Hooft vertex in the continuum limit. We also show that, assuming these conditions, the correlators of flavor-singlet mesons are free of contributions singular in 1/m, where m is the quark mass. This conclusion holds also when a single flavor of sea quark is represented by the fourth root of the staggered-fermion determinant. We then test numerically, using the HISQ action, whether these conditions hold on realistic lattice gauge fields. We find that the needed structure does indeed emerge.

  12. Growth mode evolution of hafnium oxide by atomic layer deposition

    SciTech Connect (OSTI)

    Nie, Xianglong; Ma, Fei; Ma, Dayan, E-mail: madayan@mail.xjtu.edu.cn [State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, Shaanxi (China); Xu, Kewei [State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, People's Republic of China and Department of Physics and Opt-electronic Engineering, Xi'an University of Arts and Science, Xi'an 710065, Shaanxi (China)

    2014-01-15T23:59:59.000Z

    HfO{sub 2} thin films were deposited using tetrakis-ethylmethylamido hafnium and H{sub 2}O as precursors on silicon by atomic layer deposition (ALD). The morphology and microstructures at different ALD cycles were characterized by atomic force microscopy and high-resolution transmission electron microscopy. Based on the height–height correlation function and power spectral density function, quantitative analysis of surface morphologies was performed. Three characteristic dimensions (?{sub 1}, ?{sub 2}, and ?{sub 3}) corresponding to three surface structures, islands, local and global fluctuations, were identified. The evolution of ALD growth mode at range of the three critical scales was investigated, respectively. It suggests the transformation of growth mode from quasi two-dimensional layer-by-layer to three-dimensional island for global fluctuations.

  13. Development of magnetohydrodynamic modes during sawteeth in tokamak plasmas

    SciTech Connect (OSTI)

    Firpo, M.-C.; Ettoumi, W. [Laboratoire de Physique des Plasmas, CNRS-Ecole Polytechnique, 91128 Palaiseau cedex (France)] [Laboratoire de Physique des Plasmas, CNRS-Ecole Polytechnique, 91128 Palaiseau cedex (France); Farengo, R. [Centro Atómico Bariloche (CNEA) and Instituto Balseiro (UNC-CNEA), San Carlos de Bariloche, RN 8400 (Argentina)] [Centro Atómico Bariloche (CNEA) and Instituto Balseiro (UNC-CNEA), San Carlos de Bariloche, RN 8400 (Argentina); Ferrari, H. E. [Centro Atómico Bariloche (CNEA) and Instituto Balseiro (UNC-CNEA), San Carlos de Bariloche, RN 8400 (Argentina) [Centro Atómico Bariloche (CNEA) and Instituto Balseiro (UNC-CNEA), San Carlos de Bariloche, RN 8400 (Argentina); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Bariloche (Argentina); García-Martínez, P. L. [Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Bariloche (Argentina)] [Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Bariloche (Argentina); Lifschitz, A. F. [Laboratoire d'Optique Appliquée, ENSTA, CNRS, Ecole Polytechnique, 91761 Palaiseau (France)] [Laboratoire d'Optique Appliquée, ENSTA, CNRS, Ecole Polytechnique, 91761 Palaiseau (France)

    2013-07-15T23:59:59.000Z

    A dynamical analysis applied to a reduced resistive magnetohydrodynamics model is shown to explain the chronology of the nonlinear destabilization of modes observed in tokamak sawteeth. A special emphasis is put on the nonlinear self-consistent perturbation of the axisymmetric m = n = 0 mode that manifests through the q-profile evolution. For the very low fusion-relevant resistivity values, the q-profile is shown to remain almost unchanged on the early nonlinear timescale within the central tokamak region, which supports a partial reconnection scenario. Within the resistive region, indications for a local flattening or even a local reversed-shear of the q-profile are given. The impact of this ingredient in the occurrence of the sawtooth crash is discussed.

  14. Optoelectronic cooling of mechanical modes in a semiconductor nanomembrane

    E-Print Network [OSTI]

    K. Usami; A. Naesby; T. Bagci; B. Melholt Nielsen; J. Liu; S. Stobbe; P. Lodahl; E. S. Polzik

    2010-11-22T23:59:59.000Z

    Optical cavity cooling of mechanical resonators has recently become a research frontier. The cooling has been realized with a metal-coated silicon microlever via photo-thermal force and subsequently with dielectric objects via radiation pressure. Here we report cavity cooling with a crystalline semiconductor membrane via a new mechanism, in which the cooling force arises from the interaction between the photo-induced electron-hole pairs and the mechanical modes through the deformation potential coupling. The optoelectronic mechanism is so efficient as to cool a mode down to 4 K from room temperature with just 50 uW of light and a cavity with a finesse of 10 consisting of a standard mirror and the sub-wavelength-thick semiconductor membrane itself. The laser-cooled narrow-band phonon bath realized with semiconductor mechanical resonators may open up a new avenue for photonics and spintronics devices.

  15. EFFECTS OF ASYMMETRIC FLOWS IN SOLAR CONVECTION ON OSCILLATION MODES

    SciTech Connect (OSTI)

    Baldner, Charles S.; Schou, Jesper, E-mail: baldner@stanford.edu [W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305-4085 (United States)

    2012-11-20T23:59:59.000Z

    Many helioseismic measurements suffer from substantial systematic errors. A particularly frustrating one is that time-distance measurements suffer from a large center to limb effect which looks very similar to the finite light travel time, except that the magnitude depends on the observable used and can have the opposite sign. This has frustrated attempts to determine the deep meridional flow in the solar convection zone, with Zhao et al. applying an ad hoc correction with little physical basis to correct the data. In this Letter, we propose that part of this effect can be explained by the highly asymmetrical nature of the solar granulation which results in what appears to the oscillation modes as a net radial flow, thereby imparting a phase shift on the modes as a function of observing height and thus heliocentric angle.

  16. The whistler mode refractive index as a function of gyrofrequency

    SciTech Connect (OSTI)

    Albert, J. M. [Air Force Research Laboratory/RVBX, Kirtland AFB, New Mexico 87117 (United States)

    2011-08-15T23:59:59.000Z

    The refractive index for a constant-frequency whistler mode wave in an electron-proton plasma is considered as a function of position, through the local gyrofrequencies {Omega}{sub e,i}. The full cold plasma dispersion relation is used. The wave frequency can take any value up to the smaller of {Omega}{sub e} and the plasma frequency {omega}{sub pe}, but {omega}{sub pe} is allowed to take any fixed value, as is the wavenormal angle. It is rigorously established that the refractive index is a decreasing function of {Omega}{sub e}. One application of this is to finding locations of Landau and cyclotron resonances, to evaluate the effects of whistler mode waves on radiation belt electrons.

  17. Present and Future Modes of Low Frequency Climate Variability

    SciTech Connect (OSTI)

    Cane, Mark A.

    2014-02-20T23:59:59.000Z

    This project addressed area (1) of the FOA, “Interaction of Climate Change and Low Frequency Modes of Natural Climate Variability”. Our overarching objective is to detect, describe and understand the changes in low frequency variability between model simulations of the preindustrial climate and simulations of a doubled CO2 climate. The deliverables are a set of papers providing a dynamical characterization of interannual, decadal, and multidecadal variability in coupled models with attention to the changes in this low frequency variability between pre-industrial concentrations of greenhouse gases and a doubling of atmospheric concentrations of CO2. The principle mode of analysis, singular vector decomposition, is designed to advance our physical, mechanistic understanding. This study will include external natural variability due to solar and volcanic aerosol variations as well as variability internal to the climate system. An important byproduct is a set of analysis tools for estimating global singular vector structures from the archived output of model simulations.

  18. Kerr quasinormal modes and Hod's time-temperature bound

    E-Print Network [OSTI]

    A. Gruzinov

    2007-05-11T23:59:59.000Z

    We give an explicit expression for the frequencies of slowly damped quasinormal modes of near-extreme Kerr black holes. It follows from this expression that the near-extreme Kerr holes obey the Hod's bound: in the limit of maximal rotation, $\\lim \\sup \\omega_{IS}/T\\leq \\pi / \\hbar$, where $\\omega _{IS}$ is the decay rate of the slowest decaying quasinormal mode, $T$ is the black hole temperature. On the other hand, the bound is not saturated in the sense that $\\lim \\inf \\omega_{IS}/T< \\pi /\\hbar$ is a strict inequality. {\\it It remains unclear} whether the bound is saturated in the sense that $\\lim \\sup \\omega_{IS}/T= \\pi /\\hbar$.

  19. Collective Modes of Chiral Kinetic Theory in Magnetic Field

    E-Print Network [OSTI]

    Mikhail Stephanov; Ho-Ung Yee; Yi Yin

    2014-12-31T23:59:59.000Z

    We study collective excitations in systems described by chiral kinetic theory in external magnetic field. We consider high-temperature weak-coupling plasma, as well as high-density Landau Fermi liquid with interaction not restricted to be weak. We show that chiral magnetic wave (CMW) emerges in hydrodynamic regime (at frequencies smaller than collision relaxation rate) and the CMW velocity is determined by thermodynamic properties only. We find that in a plasma of opposite chiralities, at frequencies smaller than the chirality-flipping rate, the CMW excitation turns into a vector-like diffusion mode. In the interacting Fermi liquid, the CMW turns into the Landau zero sound mode in the high-frequency collisionless regime.

  20. Collective Modes of Chiral Kinetic Theory in Magnetic Field

    E-Print Network [OSTI]

    Stephanov, Mikhail; Yin, Yi

    2015-01-01T23:59:59.000Z

    We study collective excitations in systems described by chiral kinetic theory in external magnetic field. We consider high-temperature weak-coupling plasma, as well as high-density Landau Fermi liquid with interaction not restricted to be weak. We show that chiral magnetic wave (CMW) emerges in hydrodynamic regime (at frequencies smaller than collision relaxation rate) and the CMW velocity is determined by thermodynamic properties only. We find that in a plasma of opposite chiralities, at frequencies smaller than the chirality-flipping rate, the CMW excitation turns into a vector-like diffusion mode. In the interacting Fermi liquid, the CMW turns into the Landau zero sound mode in the high-frequency collisionless regime.

  1. A new low-frequency backward mode in inhomogeneous plasmas

    SciTech Connect (OSTI)

    Vranjes, J., E-mail: jvranjes@yahoo.com [Institute of Physics, Pregrevica 118, 11080 Zemun, Belgrade (Serbia)

    2014-07-15T23:59:59.000Z

    When an electromagnetic transverse wave propagates through an inhomogeneous plasma so that its electric field has a component in the direction of the background density gradient, there appears a disbalance of charge in every plasma layer, caused by the density gradient. Due to this, some additional longitudinal electric field component appears in the direction of the wave vector. This longitudinal field may couple with the usual electrostatic longitudinal perturbations like the ion acoustic, electron Langmuir, and ion plasma waves. As a result, these standard electrostatic waves are modified and in addition to this a completely new low-frequency mode appears. Some basic features of the coupling and modification of the ion acoustic wave, and properties of the new mode are discussed here, in ordinary electron-ion and in pair plasmas.

  2. Development and Use of the Dual-Mode Plasma Torch

    SciTech Connect (OSTI)

    Womack, R.; Shuey, M.

    2002-02-26T23:59:59.000Z

    After several years of development, a commercially available high-temperature treatment system has been developed and installed that treats heterogeneous low-level radioactive waste. High temperature plasma processing, unique torch design and operating features make it feasible to achieve a volume reduced, permanent, high integrity waste form while eliminating the personnel exposure and costs associated with conventional sorting, characterizing and handling. Plasma technology can also be used to treat previous conditioned waste packages that no longer meet the current acceptance criteria for final disposal. Plasma treatment can result, in many cases, in a substantial volume reduction, which lowers the final disposal costs. This paper covers the recently patented dual mode plasma torch design(1), the lessons learned that fostered its development and the advantages it brings to radioactive waste processing. This paper also provides current full scale Plasma Arc Centrifugal Treatment (PACT) project status and how the dual mode torch is being used in the PACT system.

  3. Electromechanical Mode Online Estimation using Regularized Robust RLS Methods

    SciTech Connect (OSTI)

    Zhou, Ning; Trudnowski, Daniel; Pierre, John W.; Mittelstadt, William

    2008-11-01T23:59:59.000Z

    This paper proposes a regularized robust recursive least square (R3LS) method for on-line estimation of power-system electromechanical modes based on synchronized phasor measurement unit (PMU) data. The proposed method utilizes an autoregressive moving average exogenous (ARMAX) model to account for typical measurement data, which includes low-level pseudo-random probing, ambient, and ringdown data.? A robust objective function is utilized to reduce the negative influence from non-typical data, which include outliers and missing data. A dynamic regularization method is introduced to help include a priori knowledge about the system and reduce the influence of under-determined problems. Based on a 17-machine simulation model, it is shown through the Monte-Carlo method that the proposed R3LS method can estimate and track electromechani-cal modes by effectively using combined typical and non-typical measurement data.

  4. Mode-locked solid state lasers using diode laser excitation

    DOE Patents [OSTI]

    Holtom, Gary R. (Boston, MA)

    2012-03-06T23:59:59.000Z

    A mode-locked laser employs a coupled-polarization scheme for efficient longitudinal pumping by reshaped laser diode bars. One or more dielectric polarizers are configured to reflect a pumping wavelength having a first polarization and to reflect a lasing wavelength having a second polarization. An asymmetric cavity provides relatively large beam spot sizes in gain medium to permit efficient coupling to a volume pumped by a laser diode bar. The cavity can include a collimation region with a controlled beam spot size for insertion of a saturable absorber and dispersion components. Beam spot size is selected to provide stable mode locking based on Kerr lensing. Pulse durations of less than 100 fs can be achieved in Yb:KGW.

  5. Operating Modes of a Teeter-Rotor Wind Turbine

    SciTech Connect (OSTI)

    Bir, G. S. (National Renewable Energy Laboratory); Stol, K. (University of Colorado at Boulder)

    1999-02-25T23:59:59.000Z

    We examine the operating modes of a two-bladed teetered wind turbine. Because of the gyroscopic asymmetry of its rotor, this turbine's dynamics can be quite distinct from those of a turbine with three or more blades. This asymmetry leads to system equations with periodic coefficients that are solved using the Floquet approach to extract the correct modal parameters. The system equations are derived using a simple analytical model with four degrees of freedom: cacelle yaw, rotor teeter, and flapping associated with each blade. Results confirm that the turbine modes become more dominated by the centrifugal and gyroscopic effects as the rotor speed increases. They gyroscopic effect may also cause dynamic instability. Under certain design conditions, yaw and teeter modal frequencies may coalesce.

  6. Gravitational-wave modes from precessing black-hole binaries

    E-Print Network [OSTI]

    Michael Boyle; Lawrence E. Kidder; Serguei Ossokine; Harald P. Pfeiffer

    2014-09-22T23:59:59.000Z

    Gravitational waves from precessing black-hole binaries exhibit features that are absent in nonprecessing systems. The most prominent of these is a parity-violating asymmetry that beams energy and linear momentum preferentially along or opposite to the orbital angular momentum, leading to recoil of the binary. The asymmetry will appear as amplitude and phase modulations at the orbital frequency. For strongly precessing systems, it accounts for at least 3% amplitude modulation for binaries in the sensitivity band of ground-based gravitational-wave detectors, and can exceed 50% for massive systems. Such asymmetric features are also clearly visible when the waves are decomposed into modes of spin-weighted spherical harmonics, and are inherent in the waves themselves---rather than resulting from residual eccentricity in numerical simulations, or from mode-mixing due to precession. In particular, there is generically no instantaneous frame for which the mode decomposition will have any symmetry. We introduce a method to simplify the expressions for waveforms given in analytical relativity, which can be used to combine existing high-order waveforms for nonprecessing systems with expressions for the precessing contributions, leading to improved accuracy and a unified treatment of precessing and nonprecessing binaries. Using this method, it is possible to clarify the nature and the origins of the asymmetries and show the effects of asymmetry on recoils more clearly. We present post-Newtonian (PN) expressions for the waveform modes that include these terms, complete to the relative 2PN level in spin (proportional to $v^4/c^4$ times a certain combination of the spins). Comparing the results of those expressions to numerical results, we find good qualitative agreement. We also demonstrate how these expressions can be used to efficiently calculate waveforms for gravitational-wave astronomy.

  7. Synchronization Techniques for Burst-Mode Continuous Phase Modulation

    E-Print Network [OSTI]

    Hosseini, Ehsan

    2013-12-31T23:59:59.000Z

    .12 BER for the burst-mode CPM receiver. L0 is the preamble length in terms of data symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 4.1 Phase response q(t) for SOQPSK-MIL (L = 1) and SOQPSK-TG (L = 8). . . . . 86 4.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 4.5 The computer search results for optimum training sequence for SOQPSK-MIL when L0 = 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 xii 4.6 The unwrapped phase response of SOQPSK-MIL and SOQPSK-TG schemes...

  8. Deterministic passive mode locking of solid-state lasers

    SciTech Connect (OSTI)

    Martinez, O.E.; Spinelli, L.A.

    1981-12-01T23:59:59.000Z

    An additional passive modulation is inserted in the cavity of a passive mode-locked Nd:glass laser in order to provide the conditions for a complete selectivity of the system. A rate equation approach shows that a stationary condition is reached in which only one pulse of the original fluctuation pattern is left. Computed simulations and experimental results are also shown confirming the theoretical predictions.

  9. Photon detection efficiency of Geiger-mode avalanche photodiodes

    E-Print Network [OSTI]

    Simonetta Gentile; Ekaterina Kuznetsova; Franco Meddi

    2010-06-16T23:59:59.000Z

    The photon detection efficiencies of multi-pixel Geiger-mode avalanche photodiodes manufactured by different produ cers are estimated. A new fit method of the response spectra to low-intensity light, taking into ac count after-pulse and cross-talk effects is proposed to yield the initial number of photons. The value of photon detection efficiency is calculated using a calibrated photodetector as a reference.

  10. Optical pumping in a whispering mode optical waveguide

    DOE Patents [OSTI]

    Kurnit, Norman A. (Santa Fe, NM)

    1984-01-01T23:59:59.000Z

    A device and method for optical pumping in a whispering mode optical waveguide. Both a helical ribbon and cylinder are disclosed which incorporate an additional curvature for confining the beam to increase intensity. An optical pumping medium is disposed in the optical path of the beam as it propagates along the waveguide. Optical pumping is enhanced by the high intensities of the beam and long interaction pathlengths which are achieved in a small volume.

  11. Optical pumping in a whispering-mode optical waveguide

    DOE Patents [OSTI]

    Kurnit, N.A.

    1981-08-11T23:59:59.000Z

    A device and method for optical pumping in a whispering mode optical waveguide are described. Both a helical ribbon and cylinder are disclosed which incorporate an additional curvature for confining the beam to increase intensity. An optical pumping medium is disposed in the optical path of the beam as it propagates along the waveguide. Optical pumping is enhanced by the high intensities of the beam and long interaction path lengths which are achieved in a small volume.

  12. Electromagnetic quasinormal modes of D-dimensional black holes

    E-Print Network [OSTI]

    A. López-Ortega

    2006-11-02T23:59:59.000Z

    Using the monodromy method we calculate the asymptotic quasinormal (QN) frequencies of an electromagnetic field moving in D-dimensional Schwarzschild and Schwarzschild de Sitter (SdS) black holes ($D\\geq 4$). For the D-dimensional Schwarzschild anti-de Sitter (SadS) black hole we also compute these frequencies with a similar method. Moreover, we calculate the electromagnetic normal modes of the D-dimensional anti-de Sitter (AdS) spacetime.

  13. A guided mode in the range of the radiation modes for a rib Exemple d'un mode guid'e plong'e parmi les modes de radiation

    E-Print Network [OSTI]

    Mahé, Fabrice

    Journal of Optics 28 (1997) 41­43 Abstract The stratified cladding of integrated optical waveguides is dis''etude s'epar'ee des modes sym'etriques et antisym'etriques. In integrated optics the cross: \\Gamma 4u \\Gamma k 2 n 2 = \\Gammafi 2 u; in R 2 ; (1) where k is the wave number, fi the propaga­ tion

  14. Notes 09. Numerical evaluation of natural modes and frequencies

    E-Print Network [OSTI]

    San Andres, Luis

    2008-01-01T23:59:59.000Z

    . From Eq. (3) ?=K? M? (6) MEEN 617 ? HD#9. Numerical methods for finding eigenvalues & eigenvectors L. San Andr?s ? 2008 4 One can define the product 1? B = M K (6a) and write Eq...MEEN 617 ? HD#9. Numerical methods for finding eigenvalues & eigenvectors L. San Andr?s ? 2008 1 ME617 - Handout 9 Solving the eigenvalue problem - Numerical Evaluation of Natural Modes and Frequencies in MDOF systems The standard...

  15. Mode Shape Estimation Algorithms Under Ambient Conditions: A Comparative Review

    SciTech Connect (OSTI)

    Dosiek, Luke; Zhou, Ning; Pierre, John W.; Huang, Zhenyu; Trudnowski, Daniel J.

    2013-05-01T23:59:59.000Z

    Abstract—This paper provides a comparative review of five existing ambient electromechanical mode shape estimation algorithms, i.e., the Transfer Function (TF), Spectral, Frequency Domain Decomposition (FDD), Channel Matching, and Subspace Methods. It is also shown that the TF Method is a general approach to estimating mode shape and that the Spectral, FDD, and Channel Matching Methods are actually special cases of it. Additionally, some of the variations of the Subspace Method are reviewed and the Numerical algorithm for Subspace State Space System IDentification (N4SID) is implemented. The five algorithms are then compared using data simulated from a 17-machine model of the Western Electricity Coordinating Council (WECC) under ambient conditions with both low and high damping, as well as during the case where ambient data is disrupted by an oscillatory ringdown. The performance of the algorithms is compared using the statistics from Monte Carlo Simulations and results from measured WECC data, and a discussion of the practical issues surrounding their implementation, including cases where power system probing is an option, is provided. The paper concludes with some recommendations as to the appropriate use of the various techniques. Index Terms—Electromechanical mode shape, small-signal stability, phasor measurement units (PMU), system identification, N4SID, subspace.

  16. Prufer Transformations for the Normal Modes in Ocean Acoustics

    SciTech Connect (OSTI)

    Baggeroer, Arthur B. [Massachusetts Institute of Technology, Cambridge, MA 02139 (United States)

    2010-09-06T23:59:59.000Z

    In 1926 Prufer introduced a method of transforming the second order Sturm-Liouville (SL) equation into two nonlinear first order differential equations for the phase oe and ''magnitude'', |oe{sup 2}+oe{sup 2}| for a Poincare phase space representation, (oe,oe). The useful property is the phase equation decouples from the magnitude one which leads to a nonlinear, two point boundary value problem for the eigenvalues, or SL numbers. The transformation has been used both theoretically, e.g. Atkinson, [1960] to prove certain properties of SL equations as well as numerically e.g Bailey [1978]. This paper examines the utility of the Prufer transformation in the context of numerical solutions for modes of the ocean acoustic wave equation. (Its use is certainly not well known in the ocean acoustics community.) Equations for the phase, oe, and natural logarithm of the ''magnitude'', ln(|oe{sup 2}+oe{sup 2}|) lead to same decoupling and a fast and efficient numerical solution with the SL eigenvalues mapping to the horizontal wavenubers. The Prufer transformation has stabilty problems for low order modes at high frequecies, so a numerically stable method of integrating the phase equation is derived. This seems to be the first time the these stability issues have been highlighted to provide a robust algorthim for the modes.

  17. Differential rotation of the unstable nonlinear r-modes

    E-Print Network [OSTI]

    Friedman, John L; Lockitch, Keith H

    2015-01-01T23:59:59.000Z

    At second order in perturbation theory, the $r$-modes of uniformly rotating stars include an axisymmetric part that can be identified with differential rotation of the background star. If one does not include radiation-reaction, the differential rotation is constant in time and has been computed by S\\'a. It has a gauge dependence associated with the family of time-independent perturbations that add differential rotation to the unperturbed equilibrium star: For stars with a barotropic equation of state, one can add to the time-independent second-order solution arbitrary differential rotation that is stratified on cylinders (that is a function of distance $\\varpi$ to the axis of rotation). We show here that the gravitational radiation-reaction force that drives the $r$-mode instability removes this gauge freedom: The expontially growing differential rotation of the unstable second-order $r$-mode is unique. We derive a general expression for this rotation law for Newtonian models and evaluate it explicitly for s...

  18. Proposal for efficient mode converter based on cavity quantum electrodynamics dark mode in a semiconductor quantum dot coupled to a bimodal microcavity

    SciTech Connect (OSTI)

    Li, Jiahua [School of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China); Key Laboratory of Fundamental Physical Quantities Measurement of Ministry of Education, Wuhan 430074 (China); Yu, Rong, E-mail: yurong321@126.com [School of Science, Hubei Province Key Laboratory of Intelligent Robot, Wuhan Institute of Technology, Wuhan 430073 (China); Ma, Jinyong; Wu, Ying, E-mail: yingwu2@163.com [School of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China)

    2014-10-28T23:59:59.000Z

    The ability to engineer and convert photons between different modes in a solid-state approach has extensive technological implications not only for classical communication systems but also for future quantum networks. In this paper, we put forward a scheme for coherent mode conversion of optical photons by utilizing the intermediate coupling between a single quantum dot and a bimodal photonic crystal microcavity via a waveguide. Here, one mode of the photonic crystal microcavity is coherently driven by an external single-frequency continuous-wave laser field and the two cavity modes are not coupled to each other due to their orthogonal polarizations. The undriven cavity mode is thus not directly coupled to the input driving laser and the only way it can get light is via the quantum dot. The influences of the system parameters on the photon-conversion efficiency are analyzed in detail in the limit of weak probe field and it is found that high photon-conversion efficiency can be achieved under appropriate conditions. It is shown that the cavity dark mode, which is a superposition of the two optical modes and is decoupled from the quantum dot, can appear in such a hybrid optical system. We discuss the properties of the dark mode and indicate that the formation of the dark mode enables the efficient transfer of optical fields between the two cavity modes.

  19. Northwest Energy Innovations (TRL 5 6 System) - WETNZ MtiMode...

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

    Northwest Energy Innovations (TRL 5 6 System) - WETNZ MtiMode Wave Energy Converter Advancement Project Northwest Energy Innovations (TRL 5 6 System) - WETNZ MtiMode Wave Energy...

  20. High-power single mode solid state laser with short wide unstable cavity: Misprints

    E-Print Network [OSTI]

    Kouznetsov, Dmitrii

    1 High-power single mode solid state laser with short wide unstable cavity: Misprints D. Kouznetsov. Kouznetsov, J.-F. Bisson, K. Takaichi K. Ueda. High-power single mode solid state laser with short wide

  1. Destabilization of low-n peeling modes by trapped energetic particles

    SciTech Connect (OSTI)

    Hao, G. Z.; Wang, A. K.; Mou, Z. Z.; Qiu, X. M. [Southwestern Institute of Physics, PO Box 432, Chengdu 610041 (China)] [Southwestern Institute of Physics, PO Box 432, Chengdu 610041 (China); Liu, Y. Q. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom)] [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Matsunaga, G. [Japan Atomic Energy Agency, 801-1, Mukouyama, Naka, Ibaraki 311-0193 (Japan)] [Japan Atomic Energy Agency, 801-1, Mukouyama, Naka, Ibaraki 311-0193 (Japan); Okabayashi, M. [Princeton Plasma Physics Laboratory, PO Box 451, Princeton, New Jersey 08543-0451 (United States)] [Princeton Plasma Physics Laboratory, PO Box 451, Princeton, New Jersey 08543-0451 (United States)

    2013-06-15T23:59:59.000Z

    The kinetic effect of trapped energetic particles (EPs), arising from perpendicular neutral beam injection, on the stable low-n peeling modes in tokamak plasmas is investigated, through numerical solution of the mode's dispersion relation derived from an energy principle. A resistive-wall peeling mode with m/n=6/1, with m and n being the poloidal and toroidal mode numbers, respectively, is destabilized by trapped EPs as the EPs' pressure exceeds a critical value ?{sub c}{sup *}, which is sensitive to the pitch angle of trapped EPs. The dependence of ?{sub c}{sup *} on the particle pitch angle is eventually determined by the bounce average of the mode eigenfunction. Peeling modes with higher m and n numbers can also be destabilized by trapped EPs. Depending on the wall distance, either a resistive-wall peeling mode or an ideal-kink peeling mode can be destabilized by EPs.

  2. Study of H-mode access conditions on the Alcator C-Mod Tokamak

    E-Print Network [OSTI]

    Ma, Yunxing

    2013-01-01T23:59:59.000Z

    Usually when sufficient heating power is injected, tokamak plasma will make an abrupt transition into a state with improved confinement, known as the high-confinement mode, or H-mode. Given the greatly enhanced fusion ...

  3. Current mode integrators and their applications in low-voltage high frequency CMOS signal processing

    E-Print Network [OSTI]

    Smith, Sterling Lane

    1993-01-01T23:59:59.000Z

    Low voltage CMOS fully differential integrators for high frequency continuous-time filters using current-mode techniques are presented.. Current mode techniques are employed to avoid the use of the floating differential pair, in order to achieve...

  4. E-Print Network 3.0 - active mode locking Sample Search Results

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

    Engineering 10 40 GHz actively mode-locked erbium-doped fiber ring laser using an electro-absorption modulator and a linear optical amplifier Summary: 40 GHz actively mode-locked...

  5. Mode propagation and absorption loss in metal-clad periodic optical waveguides

    SciTech Connect (OSTI)

    Chunsheng Ma [Jilin Univ., Changchun (China)

    1996-02-01T23:59:59.000Z

    In terms of the mode eigenvalue equations are field distributions, calculations are performed for Au/InGaAsP/InP, air/Au/InGaAsP/InP, and Au/DiO{sub 2}InGaAsP/InP periodic optical waveguides. On the basis of the computed results, the coupling property in the periodic structure is analyzed, the mode split and the mode band formation of both TE and TM guided modes are described, and the effects of the thickness of the metal cladding and the oxide buffer layer on mode propagation and absorption loss are discussed for TE and TM guided modes as well as for the TM surface-plasma mode. Furthermore, the conversion from the surface-plasma wave to the guided wave for the TM mode is explained for Au/SiO{sub 2}/InGaAsP/InP periodic structures. 27 refs., 8 figs.

  6. Acoustic Modes in Combustors with Complex Impedances and Multidimensional Active Flames

    E-Print Network [OSTI]

    Nicoud, Franck

    Acoustic Modes in Combustors with Complex Impedances and Multidimensional Active Flames F. Nicoud for computing the thermoacoustic modes in combustors. In the case of a nonisothermal reacting medium, the wave

  7. Multi-Mode RCCI Has Great Potential to Improve Fuel Economy in...

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

    Multi-Mode RCCI Has Great Potential to Improve Fuel Economy in Light-Duty Diesel Engines Multi-Mode RCCI Has Great Potential to Improve Fuel Economy in Light-Duty Diesel Engines...

  8. Fabrication of optical-mode converters for efficient fiber-to-silicon-waveguide couplers

    E-Print Network [OSTI]

    Barreto, Raúl E

    2007-01-01T23:59:59.000Z

    Optical-mode converters are needed to efficiently couple light from an optical fiber to a photonic circuit by matching and transforming the propagating modes. This work is based on a horizontally-tapered coupler, in which ...

  9. Modeling streamers in transformer oil: The transitional fast 3rd mode streamer

    E-Print Network [OSTI]

    Zahn, Markus

    This paper presents an electro-thermal hydrodynamic model that explains the development of different streamer modes in transformer oil. The focus is on the difference between the slow 2nd and fast 3rd mode streamers ...

  10. ECG ARTIFACT REMOVAL FROM SURFACE EMG SIGNALS BY COMBINING EMPIRICAL MODE DECOMPOSITION AND

    E-Print Network [OSTI]

    ECG ARTIFACT REMOVAL FROM SURFACE EMG SIGNALS BY COMBINING EMPIRICAL MODE DECOMPOSITION separation, ensemble empirical mode decomposition, ECG interference artifact, data preprocessing Abstract: The electrocardiography (ECG) artifact in surface electromyography (sEMG) is a major source of noise influencing

  11. ALBOTA ET AL. Three-Dimensional Imaging Laser Radars with Geiger-Mode Avalanche Photodiode Arrays

    E-Print Network [OSTI]

    · ALBOTA ET AL. Three-Dimensional Imaging Laser Radars with Geiger-Mode Avalanche Photodiode Arrays- lanche photodiodes (APDs) operating in Geiger mode, with integrated timing circuitry for each pixel [2-Mode Avalanche Photodiode Arrays Marius A. Albota, Brian F. Aull, Daniel G. Fouche, Richard M. Heinrichs, David G

  12. Signal-to-noise ratio of Geiger-mode avalanche photodiode single-photon

    E-Print Network [OSTI]

    Figer, Donald F.

    Signal-to-noise ratio of Geiger-mode avalanche photodiode single-photon counting detectors Kimberly Kolb #12;Signal-to-noise ratio of Geiger-mode avalanche photodiode single-photon counting detectors, Rochester, New York 14623 Abstract. Geiger-mode avalanche photodiodes (GM-APDs) use the avalanche mechanism

  13. Elephant modes and low frequency unsteadiness in a high Reynolds number, transonic afterbody wake

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Elephant modes and low frequency unsteadiness in a high Reynolds number, transonic afterbody wake: 129.104.29.1 On: Wed, 09 Jul 2014 11:28:59 #12;Elephant modes and low frequency unsteadiness in a high. This result strongly suggests that a so-called elephant mode is responsible for the intense oscillations

  14. Mode-locked fiber lasers using vertically aligned carbon nanotubes directly synthesized onto substrates

    E-Print Network [OSTI]

    Maruyama, Shigeo

    Mode-locked fiber lasers using vertically aligned carbon nanotubes directly synthesized onto novel passively mode-locked fiber lasers using vertically aligned carbon nanotubes synthesized using.4890) Organic materials 1. Introduction Passively mode-locked fiber lasers have been used in many applications

  15. Mode transition and nonlinear self-oscillations in the beam-driven collisional discharge plasma

    E-Print Network [OSTI]

    Lee, Hae June

    Mode transition and nonlinear self-oscillations in the beam-driven collisional discharge plasma Hae Received 13 February 1998; accepted 19 May 1998 Nonlinear dynamics and self-oscillations in a dc beam. A theory for the critical voltage of mode transition between temperature-limited and anode-glow modes

  16. Intense Geodesic Acousticlike Modes Driven by Suprathermal Ions in a Tokamak Plasma R. Nazikian,1

    E-Print Network [OSTI]

    Intense Geodesic Acousticlike Modes Driven by Suprathermal Ions in a Tokamak Plasma R. Nazikian,1 G for the energetic-particle-driven geodesic acoustic mode. DOI: 10.1103/PhysRevLett.101.185001 PACS numbers: 52.35.Bj of strong beam ion redistribution and/or loss. The mode fre- quency is $50% below the ideal geodesic

  17. Kinetic Theories of Geodesic Acoustic Modes: Radial Structure, Linear Excitation by Energetic Particles and Nonlinear Saturation

    E-Print Network [OSTI]

    Zonca, Fulvio

    Kinetic Theories of Geodesic Acoustic Modes: Radial Structure, Linear Excitation by Energetic, Vol.13, No.3, Jun 2011 Kinetic Theories of Geodesic Acoustic Modes: Radial Structure, Linear, Univ. of California, Irvine CA 92697-4575, USA Abstract Geodesic acoustic modes (GAMs) are oscillating

  18. Kinetic theory of Geodesic Acoustic Modes: radial structures and nonlinear excitations

    E-Print Network [OSTI]

    Zonca, Fulvio

    1 TH/P3-7 Kinetic theory of Geodesic Acoustic Modes: radial structures and nonlinear excitations F author: zonca@frascati.enea.it Abstract. Geodesic Acoustic Modes (GAM) are shown to constitute, we show that Geodesic Acoustic Modes (GAM) [1] constitute a continuous spec- trum due to radial

  19. Mixed-mode fracture of human cortical bone Elizabeth A. Zimmermann a,b

    E-Print Network [OSTI]

    Ritchie, Robert

    Mixed-mode fracture of human cortical bone Elizabeth A. Zimmermann a,b , Maximilien E. Launey Available online 1 July 2009 Keywords: Human cortical bone Mixed-mode fracture Fracture toughness Fracture mechanisms a b s t r a c t Although the mode I (tensile opening) fracture toughness has been the focus

  20. Mode-specific energy analysis for rotating-vibrating triatomic molecules in classical trajectory simulation

    E-Print Network [OSTI]

    Kim, Myung Soo

    Mode-specific energy analysis for rotating-vibrating triatomic molecules in classical trajectory A method for the mode-specific energy analysis in a classical trajectory calculation is developed. The pure, suggesting that the present method is adequate for the mode-specific energy analysis of classical trajectory

  1. Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes

    E-Print Network [OSTI]

    CMS Collaboration

    2014-08-20T23:59:59.000Z

    A search for invisible decays of Higgs bosons is performed using the vector boson fusion and associated ZH production modes. In the ZH mode, the Z boson is required to decay to a pair of charged leptons or a b b-bar quark pair. The searches use the 8 TeV pp collision dataset collected by the CMS detector at the LHC, corresponding to an integrated luminosity of up to 19.7 inverse femtobarns. Certain channels include data from 7 TeV collisions corresponding to an integrated luminosity of 4.9 inverse femtobarns. The searches are sensitive to non-standard-model invisible decays of the recently observed Higgs boson, as well as additional Higgs bosons with similar production modes and large invisible branching fractions. In all channels, the observed data are consistent with the expected standard model backgrounds. Limits are set on the production cross section times invisible branching fraction, as a function of the Higgs boson mass, for the vector boson fusion and ZH production modes. By combining all channels, and assuming standard model Higgs boson cross sections and acceptances, the observed (expected) upper limit on the invisible branching fraction at m[H] = 125 GeV is found to be 0.58 (0.44) at 95% confidence level. We interpret this limit in terms of a Higgs-portal model of dark matter interactions.

  2. Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes

    SciTech Connect (OSTI)

    Chatrchyan, Serguei; et. al,

    2014-08-01T23:59:59.000Z

    A search for invisible decays of Higgs bosons is performed using the vector boson fusion and associated ZH production modes. In the ZH mode, the Z boson is required to decay to a pair of charged leptons or a b b-bar quark pair. The searches use the 8 TeV pp collision dataset collected by the CMS detector at the LHC, corresponding to an integrated luminosity of up to 19.7 inverse femtobarns. Certain channels include data from 7 TeV collisions corresponding to an integrated luminosity of 4.9 inverse femtobarns. The searches are sensitive to non-standard-model invisible decays of the recently observed Higgs boson, as well as additional Higgs bosons with similar production modes and large invisible branching fractions. In all channels, the observed data are consistent with the expected standard model backgrounds. Limits are set on the production cross section times invisible branching fraction, as a function of the Higgs boson mass, for the vector boson fusion and ZH production modes. By combining all channels, and assuming standard model Higgs boson cross sections and acceptances, the observed (expected) upper limit on the invisible branching fraction at m[H] = 125 GeV is found to be 0.58 (0.44) at 95% confidence level. We interpret this limit in terms of a Higgs-portal model of dark matter interactions.

  3. Mixed mode control method and engine using same

    DOE Patents [OSTI]

    Kesse, Mary L. (Peoria, IL); Duffy, Kevin P. (Metamora, IL)

    2007-04-10T23:59:59.000Z

    A method of mixed mode operation of an internal combustion engine includes the steps of controlling a homogeneous charge combustion event timing in a given engine cycle, and controlling a conventional charge injection event to be at least a predetermined time after the homogeneous charge combustion event. An internal combustion engine is provided, including an electronic controller having a computer readable medium with a combustion timing control algorithm recorded thereon, the control algorithm including means for controlling a homogeneous charge combustion event timing and means for controlling a conventional injection event timing to be at least a predetermined time from the homogeneous charge combustion event.

  4. New modes of particle accelerations techniques and sources. Formal report

    SciTech Connect (OSTI)

    Parsa, Z. [ed.

    1996-12-31T23:59:59.000Z

    This Report includes copies of transparencies and notes from the presentations made at the Symposium on New Modes of Particle Accelerations - Techniques and Sources, August 19-23, 1996 at the Institute for Theoretical Physics, University of California, Santa Barbara California, that was made available by the authors. Editing, reduction and changes to the authors contributions were made only to fulfill the printing and publication requirements. We would like to take this opportunity and thank the speakers for their informative presentations and for providing copies of their transparencies and notes for inclusion in this Report.

  5. Discovery of a new mode of nuclear fission

    SciTech Connect (OSTI)

    Hulet, E.K.; Wild, J.F.; Dougan, R.J.; Lougheed, R.W.; Landrum, J.H.; Dougan, A.D.; Schaedel, M.; Hahn, R.L.; Baisden, P.A.; Henderson, C.M.

    1986-01-01T23:59:59.000Z

    We measured the mass and kinetic-energy partitioning in the spontaneous fission of /sup 258/Fm, /sup 259/Md, /sup 260/Md, /sup 258/No, and /sup 260/(104). Surprisingly, these energy distributions were skewed upward or downward from the peak in each case, except for /sup 260/(104), indicating a composite of two energy distributions. We interpret this as a new mode of fission in which there is mixture of liquid-drop-like and fragment-shell-directed symmetric fission.

  6. Landau Damping of Geodesic Acoustic Mode in Toroidally Rotating Tokamaks

    E-Print Network [OSTI]

    Ren, Haijun

    2015-01-01T23:59:59.000Z

    Geodesic acoustic mode (GAM) is analyzed by using gyro-kinetic equations applicable to low-frequency microinstabilities in a rotating axisymmetric plasma. Dispersion relation of GAM in the presence of arbitrary Mach number is analytically dervied. Toroidal rotation plays the same effects on the GAM regardless of the orientation of equilibrium flow. It is shown that the toroidal Mach number increases the GAM frequency and dramatically decreases the Landau damping rate. Classical gyro-kinetic equation is examined to be not suitable for describing the GAM in a torodially rotating tokamak plasma even for very small Mach number.

  7. Curvature effect on tearing modes in presence of neoclassical friction

    SciTech Connect (OSTI)

    Maget, Patrick; Mellet, Nicolas; Meshcheriakov, Dmytro; Garbet, Xavier [CEA, IRFM, F-13108 Saint Paul-lez-Durance (France)] [CEA, IRFM, F-13108 Saint Paul-lez-Durance (France); Lütjens, Hinrich [Centre de Physique Théorique, Ecole Polytechnique, CNRS (France)] [Centre de Physique Théorique, Ecole Polytechnique, CNRS (France)

    2013-11-15T23:59:59.000Z

    Neoclassical physics (here associated to the poloidal variation of the magnetic field strength along field lines in a tokamak) is well known for driving self-generated plasma current and nonlinear magnetic islands associated to it in high performance, ITER relevant plasma discharges. It is demonstrated that the neoclassical friction between a magnetic perturbation and plasma flow already impacts magnetic islands in the linear regime, by inducing a weakening of curvature stabilization for tearing modes. This conclusion holds in particular for regimes where convection is influencing the pressure dynamics, as shown using a simple analytical model and confirmed in full Magneto-Hydro-Dynamics simulations.

  8. Electromagnetic quasinormal modes of D-dimensional black holes II

    E-Print Network [OSTI]

    A. López-Ortega

    2007-06-20T23:59:59.000Z

    By using the sixth order WKB approximation we calculate for an electromagnetic field propagating in D-dimensional Schwarzschild and Schwarzschild de Sitter black holes its quasinormal frequencies for the fundamental mode and first overtones. We study the dependence of these QN frequencies on the value of the cosmological constant and the spacetime dimension. We also compare with the known results for the gravitational perturbations propagating in the same background. Moreover we exactly compute the QN frequencies of the electromagnetic field propagating in D-dimensional massless topological black hole and for charged D-dimensional Nariai spacetime we exactly calculate the QN frequencies of the coupled electromagnetic and gravitational perturbations.

  9. Close-spaced Knudsen`s mode thermionic converter

    SciTech Connect (OSTI)

    Kucherov, R.Ya.; Nikolaev, Y.V. [Research Inst. of SIA Lutch, Podolsk (Russian Federation)

    1995-12-31T23:59:59.000Z

    It is demonstrated that the Knudsen`s mode of the thermionic converter (TIC) operation can be realized in a TIC with the interelectrode spacing 15{divided_by}30 {mu} and the emitter work function 5{divided_by}5.5 eV at the emitter temperature above 1800 K and cesium vapor pressure 0.5{divided_by}1 tor. With the use of reflective coating applied to the collector, efficiency of such TIC can achieve the level in excess of 30%.

  10. Composite slip table of dissimilar materials for damping longitudinal modes

    DOE Patents [OSTI]

    Gregory, D.L.; Priddy, T.G.; Smallwood, D.O.; Woodall, T.D.

    1991-06-18T23:59:59.000Z

    A vibration slip table for use in a vibration testing apparatus is disclosed. The tables comprised of at least three composite layers of material; a first metal layer, a second damping layer, and a third layer having a high acoustic velocity relative to the first layer. The different acoustic velocities between the first and third layers cause relative shear displacements between the layers with the second layer damping the displacements between the first and third layers to reduce the table longitudinal vibration modes. 6 figures.

  11. Plasmonic modes and extinction properties of a random nanocomposite cylinder

    SciTech Connect (OSTI)

    Moradi, Afshin, E-mail: a.moradi@kut.ac.ir [Department of Basic Sciences, Kermanshah University of Technology, Kermanshah, Iran and Department of Nano Science, Institute for Studies in Theoretical Physics and Mathematics (IPM), Tehran (Iran, Islamic Republic of)] [Department of Basic Sciences, Kermanshah University of Technology, Kermanshah, Iran and Department of Nano Science, Institute for Studies in Theoretical Physics and Mathematics (IPM), Tehran (Iran, Islamic Republic of)

    2014-04-15T23:59:59.000Z

    We study the properties of surface plasmon-polariton waves of a random metal-dielectric nanocomposite cylinder, consisting of bulk metal embedded with dielectric nanoparticles. We use the Maxwell-Garnett formulation to model the effective dielectric function of the composite medium and show that there exist two surface mode bands. We investigate the extinction properties of the system, and obtain the dependence of the extinction spectrum on the nanoparticles’ shape and concentration as well as the cylinder radius and the incidence angle for both TE and TM polarization.

  12. Beam dynamics studies for transverse electromagnetic mode type rf deflectors

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

    Ahmed, Shahid; Krafft, Geoffrey A.; Deitrick, Kirsten; De Silva, Subashini U.; Delayen, Jean R.; Spata, Mike; Tiefenback, Michael; Hofler, Alicia; Beard, Kevin

    2012-02-01T23:59:59.000Z

    We have performed three-dimensional simulations of beam dynamics for transverse electromagnetic mode (TEM) type rf deflectors: normal and superconducting. The compact size of these cavities as compared to the conventional TM110 type structures is more attractive particularly at low frequency. Highly concentrated electromagnetic fields between the parallel bars provide strong electrical stability to the beam for any mechanical disturbance. An array of six 2-cell normal conducting cavities or a single cell superconducting structure is enough to produce the required vertical displacement at the target point. Both the normal and superconducting structures show very small emittance dilution due to the vertical kick of the beam.

  13. Parameters of Chelyabinsk and Tunguska Objects and their Explosion Modes

    E-Print Network [OSTI]

    Lobanovsky, Yu I

    2013-01-01T23:59:59.000Z

    This paper describes briefly a mathematical model that relates the parameters of celestial body motion in spheres of activity of the Sun and the Earth with mass-energy characteristics of these celestial bodies and their explosion modes during destruction in the Earth atmosphere, that in turn are linked with phenomena observed on the underlying surface. This model was used to calculate the characteristics of the objects which are causes of Chelyabinsk and Tunguska incidents. Thus, the basic data characterizing these two outstanding phenomena were obtained with using a regular physical-mathematical procedure without any speculative hypotheses and/or assumptions.

  14. Exotic modes of excitation in proton rich nuclei

    SciTech Connect (OSTI)

    Paar, N. [Physics Department, Faculty of Science, University of Zagreb (Croatia)

    2011-11-30T23:59:59.000Z

    The framework of relativistic energy density functional has been applied in description of excitation phenomena in nuclei close to the proton drip line. In particular, low-lying dipole excitations have been studied using relativistic quasiparticle random phase approximation, based on effective Lagrangians with density dependent meson nucleon couplings. In the isovector dipole channel, the occurrence of pronounced low-lying dipole peaks is predicted, corresponding to the proton pygmy dipole resonance. Since this exotic mode still awaits its experimental confirmation, systematic calculations have been conducted within a pool of neutron deficient nuclei, in order to identify the best possible candidates for measurements.

  15. Multi-parameter Laser Modes in Paraxial Optics

    E-Print Network [OSTI]

    Christoph Koutschan; Erwin Suazo; Sergei K. Suslov

    2014-07-09T23:59:59.000Z

    We study multi-parameter solutions of the inhomogeneous paraxial wave equation in a linear and quadratic approximation which include oscillating laser beams in a parabolic waveguide, spiral light beams, and other important families of propagation-invariant laser modes in weakly varying media. A similar effect of superfocusing of particle beams in a thin monocrystal film is also discussed. In the supplementary electronic material, we provide a computer algebra verification of the results presented here, and of some related mathematical tools that were stated without proofs in the literature.

  16. Quantum and classical separability of spin-orbit laser modes

    E-Print Network [OSTI]

    L. J. Pereira; A. Z. Khoury; K. Dechoum

    2014-09-02T23:59:59.000Z

    In this work we investigate the quantum noise properties of polarization vortices in connection with an intensity based Clauser-Horne-Shimony-Holt inequality for their spin-orbit separability. We evaluate the inequality for different input quantum states and the corresponding intensity fluctuations. The roles played by coherence and photon number squeezing provide a suitable framework for characterizing pure state spin-orbit entanglement. Structural inseparability of the spin-orbit mode requires coherence, an issue concerning either classical or quantum descriptions. In both cases, it can be witnessed by violation of this intensity based CHSH inequality. However, in the quantum domain, entanglement requires both coherence and reduced photon number fluctuations.

  17. Isoscalar Breathing Mode State in Zr-90 and Sn-116

    E-Print Network [OSTI]

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

    1980-01-01T23:59:59.000Z

    PHYSICAL RKVIK% C VOLUIHE 21, NUMBER 4 Isoscalar breathing mode state in Zr and "Sn C. M. Rozsa, D. H. Youngblood, J. D. Bronson, Y.-%. Lui, and U. Garg Cyclotron Institute, Texas AckM University, College Station, Texas 77843 (Received 5..., BRONSON, LUI, AND GARG larger opening and served to catch some particles scattered from the first set. For measurements at 0', the beam was passed into the spectrograph and one set of brass defining slits with an open- ing of 6.4' horizontally by 3.V...

  18. Geothermal Heat Pumps - Heating Mode | Department of Energy

    Energy Savers [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 Inspector General Office0-72.pdfGeorge Waldmann George Waldmann Phone 202-586-9904Geothermal(FactHeating Mode

  19. Commute Mode Switching Impact Tool | Department of Energy

    Energy Savers [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 Delicious RankCombustion |Energyon ArmedWaste andAccessCO2 InjectionDepartment ofFresno U.S.Commute Mode Switching

  20. Derivation of Gell-Mann-Nishijima formula from the electromagnetic field modes of a hadron

    E-Print Network [OSTI]

    Huai-yang Cui

    2010-07-23T23:59:59.000Z

    When an electron probes another elementary particle Q, the wave function of the electron can be separated into two independent parts, the first part represents the electronic motion, the second part represents the electromagnetic field mode around the particle Q. In analogy with optical modes $TEM_{nlm}$ for a laser resonator, when the electromagnetic field around the particle Q forms into a mode, the quantum numbers of the mode satisfy the Gell-Mann-Nishijima formula, these quantum numbers are recognized as the charge number, baryon number and strangeness number. The modes are used as a visual model to understand the abstract baryon number and strangeness number of hadrons.

  1. Mode localization results and laboratory demonstration techniques with a multi-pendulum rig

    E-Print Network [OSTI]

    Bollich, Robert Kenneth Gerard

    1992-01-01T23:59:59.000Z

    . Perturbed system mode shapes, analytical, for R' = 0. 015. 16 Table III. Perturbed system mode shapes, analytical, for R' = 0. 04 (K, = 0. 908 N-m/rad, 1, = 0, 532 m). 17 Table IV. Perturbed system mode shapes, analytical, for R' = 0. 15 (K, = 3. 90 N.... Pendulum rig schematic Figure 2. Detail of pendulum rig. Figure 3. Graphical depiction of mode shapes given in Table I. 10 Figure 4. Depiction of perturbed mode shapes given in Table's II, III, and IV for: (a) Rs=0. 015; (b) R =0. 04; and (c) R =0. 15...

  2. Variational principles with Padé approximants for tearing mode analysis

    SciTech Connect (OSTI)

    Cole, Andrew J. [Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States)] [Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States); Finn, John M. [Applied Mathematics and Plasma Physics, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (United States)] [Applied Mathematics and Plasma Physics, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (United States)

    2014-03-15T23:59:59.000Z

    Tearing modes occur in several distinct physical regimes, and it is often important to compute the inner layer response for these modes with various effects. There is a need for an approximate and efficient method of solving the inner layer equations in all these regimes. In this paper, we introduce a method of solving the inner layer equations based on using a variational principle with Padé approximants. For all the regimes considered, the main layer equations to be solved are inhomogeneous, and Padé approximants give a convenient and efficient method of satisfying the correct asymptotic behavior at the edge of the layer. Results using this variational principle—Padé approximant method in three of these regimes is presented. These regimes are the constant-? resistive-inertial (RI) regime, the constant-? viscoresistive regime, and the non-constant-? inviscid tearing regime. The last regime includes the constant-? RI regime and the inertial regime. The results show that reasonable accuracy can be obtained very efficiently with Padé approximants having a small number of parameters.

  3. Concentric core optical fiber with multiple-mode signal transmission

    DOE Patents [OSTI]

    Muhs, Jeffrey D. (Lenoir City, TN)

    1997-01-01T23:59:59.000Z

    A concentric core optical fiber provides for the simultaneous but independent transmission of signals over a single optical fiber. The concentric optical fiber is constructed of a single-mode or multimode inner optical fiber defined by a core and a cladding of a lower index of refraction than the core and an outer optical fiber defined by additional cladding concentrically disposed around the cladding and of an index of refraction lower than the first mentioned cladding whereby the latter functions as the core of the outer optical fiber. By employing such an optical fiber construction with a single-mode inner core or optical fiber, highly sensitive interferometric and stable less sensitive amplitude based sensors can be placed along the same length of a concentric core optical fiber. Also, by employing the concentric core optical fiber secure telecommunications can be achieved via the inner optical fiber since an intrusion of the concentric optical fiber will first cause a variation in the light being transmitted through the outer optical fiber and this variation of light being used to trigger a suitable alarm indicative of the intrusion.

  4. The quest for novel modes of excitation in exotic nuclei

    E-Print Network [OSTI]

    N. Paar

    2010-02-25T23:59:59.000Z

    This article provides an insight into several open problems in the quest for novel modes of excitation in nuclei with isospin asymmetry, deformation and finite temperature characteristic in stellar environment. Major unsolved problems include the nature of pygmy dipole resonances, the quest for various multipole and spin-isospin excitations both in neutron-rich and proton drip-line nuclei mainly driven by loosely bound nucleons, excitations in unstable deformed nuclei and evolution of their properties with the shape phase transition. Exotic modes of excitation in nuclei at finite temperatures characteristic for supernova evolution present open problems with possible impact in modeling astrophysically relevant weak interaction rates. All these issues challenge self-consistent many body theory frameworks at the frontiers of on-going research, including nuclear energy density functionals, both phenomenological and constrained by the strong interaction physics of QCD, models based on low-momentum two-nucleon interaction V_{low-k} and correlated realistic nucleon-nucleon interaction V_{UCOM}, supplemented by three-body force, as well as two-nucleon and three-nucleon interactions derived from the chiral effective field theory. Joined theoretical and experimental efforts, including research with radioactive isotope beams, are needed to provide insight into dynamical properties of nuclei away from the valley of stability, involving the interplay of isospin asymmetry, deformation and finite temperature.

  5. Electric sail control mode for amplified transverse thrust

    E-Print Network [OSTI]

    Toivanen, Petri; Envall, Jouni

    2014-01-01T23:59:59.000Z

    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...

  6. Concentric core optical fiber with multiple-mode signal transmission

    DOE Patents [OSTI]

    Muhs, J.D.

    1997-05-06T23:59:59.000Z

    A concentric core optical fiber provides for the simultaneous but independent transmission of signals over a single optical fiber. The concentric optical fiber is constructed of a single-mode or multimode inner optical fiber defined by a core and a cladding of a lower index of refraction than the core and an outer optical fiber defined by additional cladding concentrically disposed around the cladding and of an index of refraction lower than the first mentioned cladding whereby the latter functions as the core of the outer optical fiber. By employing such an optical fiber construction with a single-mode inner core or optical fiber, highly sensitive interferometric and stable less sensitive amplitude based sensors can be placed along the same length of a concentric core optical fiber. Also, by employing the concentric core optical fiber secure telecommunications can be achieved via the inner optical fiber since an intrusion of the concentric optical fiber will first cause a variation in the light being transmitted through the outer optical fiber and this variation of light being used to trigger a suitable alarm indicative of the intrusion. 3 figs.

  7. H-Mode Accelerating Structures with PMQ Beam Focusing

    E-Print Network [OSTI]

    Kurennoy, Sergey S; O'Hara, James F; Olivas, Eric R; Wangler, Thomas P

    2011-01-01T23:59:59.000Z

    We have developed high-efficiency normal-conducting RF accelerating structures by combining H-mode resonator cavities and a transverse beam focusing by permanent-magnet quadrupoles (PMQ), for beam velocities in the range of a few percent of the speed of light. The shunt impedance of inter-digital H-mode (IH-PMQ) structures is 10-20 times higher than that of a conventional drift-tube linac, while the transverse size is 4-5 times smaller. Results of the combined 3-D modeling - electromagnetic computations, multi-particle beam-dynamics simulations with high currents, and thermal-stress analysis - for an IH-PMQ accelerator tank are presented. The accelerating field profile in the tank is tuned to provide the best propagation of a 50-mA deuteron beam using coupled iterations of electromagnetic and beam-dynamics modeling. Measurements of a cold model of the IH-PMQ tank show a good agreement with the calculations. H-PMQ accelerating structures following a short RFQ can be used both in the front end of ion linacs or ...

  8. High-sensitivity three-mode optomechanical transducer

    SciTech Connect (OSTI)

    Zhao, C.; Fang, Q.; Susmithan, S.; Miao, H.; Ju, L.; Fan, Y.; Blair, D.; Hosken, D. J.; Munch, J.; Veitch, P. J.; Slagmolen, B. J. J. [School of Physics, University of Western Australia, 35 Stirling Highway, Nedlands, Western Australia, 6009 (Australia); Department of Physics, University of Adelaide, Adelaide, South Australia, 5005 (Australia); Centre for Gravitational Physics, Australian National University, Canberra, 0200 (Australia)

    2011-12-15T23:59:59.000Z

    Three-mode optomechanical interactions have been predicted to allow the creation of very high sensitivity transducers in which very strong optical self-cooling and strong optomechanical quantum entanglement are predicted. Strong coupling is achieved by engineering a transducer in which both the pump laser and a single signal sideband frequency are resonantly enhanced. Here we demonstrate that very high sensitivity can be achieved in a very simple system consisting of a Fabry-Perot cavity with CO{sub 2} laser thermal tuning. We demonstrate a displacement sensitivity of {approx}1x10{sup -17} m/{radical}(Hz), which is sufficient to observe a thermally excited acoustic mode in a 5.6 kg sapphire mirror with a signal-to-noise ratio of more than 20 dB. It is shown that a measurement sensitivity of {approx}2x10{sup -20} m/{radical}(Hz) limited by the quantum shot noise is achievable with optimization of the cavity parameters.

  9. QUANTITATIVE TESTS OF ELMS AS INTERMEDIATE N PEELING-BALOONING MODES

    SciTech Connect (OSTI)

    LAO,LL; SNYDER,PB; LEONARD,AW; OIKAWA,T; OSBORNE,TH; PETRIE,TW; FERRON,JR; GROEBNER,RJ; HORTON,LD; KAMADA,Y; MURAKAMI,M; SAARELMA,S; STJOHN,HE; TURNBULL,AD; WILSON,HR

    2003-03-01T23:59:59.000Z

    A271 QUANTITATIVE TESTS OF ELMS AS INTERMEDIATE N PEELING-BALOONING MODES. Several testable features of the working model of edge localized modes (ELMs) as intermediate toroidal mode number peeling-ballooning modes are evaluated quantitatively using DIII-D and JT-60U experimental data and the ELITE MHD stability code. These include the hypothesis that ELM sizes are related to the radial widths of the unstable MHD modes, the unstable modes have a strong ballooning character localized in the outboard bad curvature region, and ELM size generally becomes smaller at high edge collisionality. ELMs are triggered when the growth rates of the unstable MHD modes become significantly large. These testable features are consistent with many ELM observations in DIII-D and JT-60U discharges.

  10. An overmoded relativistic backward wave oscillator with efficient dual-mode operation

    SciTech Connect (OSTI)

    Xiao, Renzhen; Li, Jiawei; Bai, Xianchen; Song, Zhimin; Teng, Yan; Ye, Hu; Li, Xiaoze; Sun, Jun; Chen, Changhua [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024 (China); Zhang, Xiaowei [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024 (China); Key Laboratory of Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049 (China)

    2014-03-03T23:59:59.000Z

    A dual-mode operation mechanism in an overmoded relativistic backward wave oscillator is presented. The electron beam interacts with the ?1st space harmonic of TM{sub 01} mode synchronously in the slow wave structure. Then the backward propagating TM{sub 01} mode is converted to the forward propagating TM{sub 02} mode. As the phase velocity of the volume harmonic of TM{sub 02} mode is about twice that of the surface harmonic of TM{sub 01} mode, the TM{sub 02} mode also plays an important role in the high-power microwave generation. Particle-in-cell simulation shows that an efficiency of 48% and a significant improvement of the power capacity have been obtained.

  11. Electromechanical Mode Shape Estimation Based on Transfer Function Identification Using PMU Measurement

    SciTech Connect (OSTI)

    Zhou, Ning; Huang, Zhenyu; Dosiek, Luke; Trudnowski, Daniel J.; Pierre, John W.

    2009-07-30T23:59:59.000Z

    Power system mode shapes are key indication of how dynamic components participate in low-frequency oscillations. Traditionally, mode shapes are calculated from a linearized dynamic model. For large-scale power systems, obtaining accu-rate dynamic models is very difficult. Therefore, measurement-based mode shape estimation methods have certain advantages, especially for the application of real-time small signal stability monitoring. In this paper, a measurement-based mode shape iden-tification method is proposed. The general relationship between transfer function (TF) and mode shape is derived. As an example, a least square (LS) method is implemented to estimate mode shape using an autoregressive exogenous (ARX) model. The per-formance of the proposed method is evaluated by Monte-Carlo studies using simulation data from a 17-machine model. The re-sults indicate the validity of the proposed method in estimating mode shapes with reasonably good accuracy

  12. Appendix A: Preamble The mode(s) and risk of transmission for each specific disease agent included in Appendix A were reviewed.

    E-Print Network [OSTI]

    Oliver, Douglas L.

    Appendix A: Preamble The mode(s) and risk of transmission for each specific disease agent included in Appendix A were reviewed. Principle sources consulted for the development of disease literature was searched for evidence of person-to-person transmission in healthcare and non

  13. Designing the Mode solving of the photonic crystal fiber via BPM and Exploring the Single-Mode Properties

    E-Print Network [OSTI]

    Debbal, Mohammed

    2012-01-01T23:59:59.000Z

    Microstructured optical fibers (MOFs) are one of the most exciting recent developments in fiber optics. A MOF usually consists of a hexagonal arrangement of air holes running down the length of a silica fiber surrounding a central core of solid silica or, in some cases air. MOFs can exhibit a number of unique properties, including zero dispersion at visible wavelengths and low or high effective nonlinearity [3]-[17], By varying the size of the holes and their number and position, one can also design MOFs with carefully controlled dispersive and modal properties. In this paper, we analyze and modeling the behavior of the photonic crystal fiber (PCF) by using in the first step a propagator method based on the BPM method. With our BPM software, the electric field contour of the fundamental mode of PCF was demonstrated. We also used it to see the variation of the effective index; an effective index model confirms that such a fiber can be single mode for any wavelength. It would make a study of photonic crystal fi...

  14. Phase space theory of Bose-Einstein condensates and time-dependent modes

    E-Print Network [OSTI]

    B. J. Dalton

    2012-07-20T23:59:59.000Z

    A phase space theory approach for treating dynamical behaviour of Bose-Einstein condensates applicable to situations such as interferometry with BEC in time-dependent double well potentials is presented. Time-dependent mode functions are used, chosen so that one, two,.. highly occupied modes describe well the physics of interacting condensate bosons in time dependent potentials at well below the transition temperature. Time dependent mode annihilation, creation operators are represented by time dependent phase variables, but time independent total field annihilation, creation operators are represented by time independent field functions. Two situations are treated, one (mode theory) is where specific mode annihilation, creation operators and their related phase variables and distribution functions are dealt with, the other (field theory) is where only field creation, annihilation operators and their related field functions and distribution functionals are involved. The paper focuses on the hybrid approach, where the modes are divided up between condensate (highly occupied) modes and non-condensate (sparsely occupied) modes. It is found that there are extra terms in the Ito stochastic equations both for the stochastic phases and stochastic fields, involving coupling coefficients defined via overlap integrals between mode functions and their time derivatives. For the hybrid approach both the Fokker-Planck and functional Fokker-Planck equations differ from those derived via the correspondence rules, the drift vectors are unchanged but the diffusion matrices contain additional terms involving the coupling coefficients. Results are also presented for the combined approach where all the modes are treated as one set.

  15. Global gyrokinetic stability of collisionless microtearing modes in large aspect ratio tokamaks

    SciTech Connect (OSTI)

    Swamy, Aditya K.; Ganesh, R., E-mail: ganesh@ipr.res.in [Institute for Plasma Research, Bhat, Gandhinagar (India); Chowdhury, J. [Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States); Brunner, S.; Vaclavik, J.; Villard, L. [CRPP, EPFL, 1015 Lausanne (Switzerland)

    2014-08-15T23:59:59.000Z

    Linear full radius gyrokinetic calculations show the existence of unstable microtearing modes (MTMs) in purely collisionless, high temperature, large aspect ratio tokamak plasmas. The present study takes into account fully gyrokinetic highly passing ions and electrons. The global 2-D structures of the collisionless mode with full radius coupling of the poloidal modes is obtained and compared with another electromagnetic mode, namely, the Alfvén Ion Temperature Gradient (AITG) mode (or Kinetic Ballooning Mode, KBM) for the same equilibrium profile. Several important characteristics of the modes are brought out and compared, such as a clear signature in the symmetry properties of the two modes, the plasma–? dependence, and radial and poloidal length scales of the electrostatic and magnetic vector potential fluctuations. Extensive parameter scans for this collisionless microtearing mode reveal the scaling of the growth rate with ? and the electron temperature gradient ?{sub e}. Scans at different ? values show an inverse relationship between the ?{sub e} threshold and ?, leading to a stability diagram, and implying that the mode might exist at moderate to strong temperature gradients for finite ? plasmas in large aspect ratio tokamaks. In contrast to small aspect ratio tokamaks where the trapped electron magnetic drift resonance is found to be important, in large aspect ratio tokamaks, a strong destabilization due to the magnetic drift resonance of passing electrons is observed and is identified as a possible collisionless drive mechanism for the collisionless MTM.

  16. Linear calculations of edge current driven kink modes with BOUT++ code

    SciTech Connect (OSTI)

    Li, G. Q., E-mail: ligq@ipp.ac.cn; Xia, T. Y. [Institute of Plasma Physics, CAS, Hefei, Anhui 230031 (China); Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Xu, X. Q. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Snyder, P. B.; Turnbull, A. D. [General Atomics, San Diego, California 92186 (United States); Ma, C. H.; Xi, P. W. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); FSC, School of Physics, Peking University, Beijing 100871 (China)

    2014-10-15T23:59:59.000Z

    This work extends previous BOUT++ work to systematically study the impact of edge current density on edge localized modes, and to benchmark with the GATO and ELITE codes. Using the CORSICA code, a set of equilibria was generated with different edge current densities by keeping total current and pressure profile fixed. Based on these equilibria, the effects of the edge current density on the MHD instabilities were studied with the 3-field BOUT++ code. For the linear calculations, with increasing edge current density, the dominant modes are changed from intermediate-n and high-n ballooning modes to low-n kink modes, and the linear growth rate becomes smaller. The edge current provides stabilizing effects on ballooning modes due to the increase of local shear at the outer mid-plane with the edge current. For edge kink modes, however, the edge current does not always provide a destabilizing effect; with increasing edge current, the linear growth rate first increases, and then decreases. In benchmark calculations for BOUT++ against the linear results with the GATO and ELITE codes, the vacuum model has important effects on the edge kink mode calculations. By setting a realistic density profile and Spitzer resistivity profile in the vacuum region, the resistivity was found to have a destabilizing effect on both the kink mode and on the ballooning mode. With diamagnetic effects included, the intermediate-n and high-n ballooning modes can be totally stabilized for finite edge current density.

  17. Baseline projections of transportation energy consumption by mode: 1981 update

    SciTech Connect (OSTI)

    Millar, M; Bunch, J; Vyas, A; Kaplan, M; Knorr, R; Mendiratta, V; Saricks, C

    1982-04-01T23:59:59.000Z

    A comprehensive set of activity and energy-demand projections for each of the major transportation modes and submodes is presented. Projections are developed for a business-as-usual scenario, which provides a benchmark for assessing the effects of potential conservation strategies. This baseline scenario assumes a continuation of present trends, including fuel-efficiency improvements likely to result from current efforts of vehicle manufacturers. Because of anticipated changes in fuel efficiency, fuel price, modal shifts, and a lower-than-historic rate of economic growth, projected growth rates in transportation activity and energy consumption depart from historic patterns. The text discusses the factors responsible for this departure, documents the assumptions and methodologies used to develop the modal projections, and compares the projections with other efforts.

  18. RSX system development under VAX/VMS compatibility mode

    SciTech Connect (OSTI)

    Fuka, M.A.

    1983-01-01T23:59:59.000Z

    The Control System for the Proton Storage Ring now being built at Los Alamos will use a VAX-11/750 as its main control computer with several LSI-11/23 microprocessors reading and controlling the hardware. The VMS Compatibility Mode makes it possible to use the VAX as a development system for the LSI-11/23 microprocessors running the RSX-11S (stand-alone) operating system. Digital Equipment Corporation (DEC)-supplied software is used to generate the RSX-11S operating system and DECNET-11S network software. We use the VMS editors to create source files, the Macro-11 assembler and the PDP-11 Fortran-77 compiler to generate object code, and the RSX Task Builder to link the executable RSX task image. The RSX task then can be tested to some extent on the VAX before it is down-line loaded to the LSI-11/23 for further testing.

  19. Design of double passive modulated mode-locked lasers

    SciTech Connect (OSTI)

    Martinez, O.E.

    1983-02-01T23:59:59.000Z

    A set of equations is obtained that allow the determination of the optimum values for the laser parameters in order to obtain perfect mode-locking by double passive modulation. The double modulation consists of a fast saturable absorber and a passive loss proportional to the mean intensity in the cavity provided by a passively driven electro-optic modulator. The stochastic nature of the emission of conventional passive modulated systems is eliminated if the correct values of the modulation parameters are chosen as predicted by the equations presented here. The predictions given by the equations were compared with previous numerical computations in order to check the validity of certain approximations used. Experimental results obtained confirm the predictions given by said equations.

  20. Distinguishability and nonclassicality of one-mode Gaussian states

    SciTech Connect (OSTI)

    Marian, Paulina [Institute for Theoretical Atomic, Molecular, and Optical Physics, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138 (United States); Department of Chemistry, University of Bucharest, Boulevard Regina Elisabeta 4-12, R-030018 Bucharest (Romania); Marian, Tudor A. [Institute for Theoretical Atomic, Molecular, and Optical Physics, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138 (United States); Department of Physics, University of Bucharest, P.O. Box MG-11, R-077125 Bucharest-Magurele (Romania); Scutaru, Horia [Center for Advanced Studies in Physics of the Romanian Academy, Calea 13 Septembrie 13, R-050711 Bucharest (Romania)

    2004-02-01T23:59:59.000Z

    We consider the class of the one-mode Gaussian states of the quantum radiation field. The relative entropy of such a state with respect to a similar one is derived. We analyze the entropic amount of nonclassicality of a Gaussian state defined as the minimal relative entropy of any classical Gaussian state with respect to it. A similar quantity built with the Hilbert-Schmidt distance is also calculated. Both nonclassicality measures are then compared with the Bures-metric degree of nonclassicality evaluated previously. The properties of the closest classical Gaussian state, as well as the decrease of the nonclassicality under thermal noise mappings are carefully examined in each case. For mixed states we find that only the Bures-distance amount of nonclassicality is equivalent to the nonclassical depth.

  1. Quasinormal modes of test fields around regular black holes

    E-Print Network [OSTI]

    Bobir Toshmatov; Ahmadjon Abdujabbarov; Zden?k Stuchlík; Bobomurat Ahmedov

    2015-03-19T23:59:59.000Z

    We study scalar, electromagnetic and gravitational test fields in the Hayward, Bardeen and Ay\\'{o}n-Beato-Garc\\'{i}a regular black hole spacetimes and demonstrate that the test fields are stable in all these spacetimes. Using the sixth order WKB approximation of the linear "axial" perturbative scheme, we determine dependence of the quasinormal mode (QNM) frequencies on the characteristic parameters of the test fields and the spacetime charge parameters of the regular black holes. We give also the greybody factors, namely the transmission and reflection coefficients of scattered scalar, electromagnetic and gravitational waves. We show that damping of the QNMs in regular black hole spacetimes is suppressed in comparison to the case of Schwarzschild black holes, and increasing charge parameter of the regular black holes increases reflection and decreases transmission factor of incident waves for each of the test fields.

  2. 275 C Downhole Switched-Mode Power Supply

    SciTech Connect (OSTI)

    Chris Hutchens; Vijay Madhuravasal

    2008-08-31T23:59:59.000Z

    A vee-square (V2) control based controller IC is developed for a switch mode power supply capable of operating at extreme temperature/harsh environment conditions. A buck type regulator with silicon carbide power junction field effect transistors (JFET) as power devices is used to analyze the performance of controller. Special emphases are made on the analog sub-blocks--voltage reference, operational transconductance amplifier and comparator as individual building blocks. Transformer coupled gate drives and high temperature operable magnetic cores and capacitors are identified and tested for use in the design. Conventional ceramic chip packaging of ICs combined with lead carrier type mounting of passive filter components is introduced for hybrid packaging of the complete product. The developed SMPS is anticipated to support the operation of down-hole microcontrollers and other electronics devices that require low/medium power filtered dc inputs over an operating temperature of 275 C.

  3. Application of Geiger-mode photo sensors in Cherenkov detectors

    E-Print Network [OSTI]

    Gamal Ahmed; Paul Buehler; Michael Cargnelli; Roland Hohler; Johann Marton; Herbert Orth; Ken Suzuki

    2010-08-31T23:59:59.000Z

    Silicon-based photosensors (SiPMs) working in the Geiger-mode represent an elegant solution for the readout of particle detectors working at low-light levels like Cherenkov detectors. Especially the insensitivity to magnetic fields makes this kind of sensors suitable for modern detector systems in subatomic physics which are usually employing magnets for momentum resolution. In our institute we are characterizing SiPMs of different manufacturers for selecting sensors and finding optimum operating conditions for given applications. Recently we designed and built a light concentrator prototype with 8x8 cells to increase the active photon detection area of an 8x8 SiPM (Hamamatsu MPPC S10931-100P) array. Monte Carlo studies, measurements of the collection efficiency, and tests with the MPPC were carried out. The status of these developments are presented.

  4. Application of Geiger-mode photo sensors in Cherenkov detectors

    E-Print Network [OSTI]

    Ahmed, Gamal; Cargnelli, Michael; Hohler, Roland; Marton, Johann; Orth, Herbert; Suzuki, Ken

    2010-01-01T23:59:59.000Z

    Silicon-based photosensors (SiPMs) working in the Geiger-mode represent an elegant solution for the readout of particle detectors working at low-light levels like Cherenkov detectors. Especially the insensitivity to magnetic fields makes this kind of sensors suitable for modern detector systems in subatomic physics which are usually employing magnets for momentum resolution. In our institute we are characterizing SiPMs of different manufacturers for selecting sensors and finding optimum operating conditions for given applications. Recently we designed and built a light concentrator prototype with 8x8 cells to increase the active photon detection area of an 8x8 SiPM (Hamamatsu MPPC S10931-100P) array. Monte Carlo studies, measurements of the collection efficiency, and tests with the MPPC were carried out. The status of these developments are presented.

  5. Efficient operating mode of the plasma wakefield accelerator

    SciTech Connect (OSTI)

    Lotov, K.V. [Budker Institute of Nuclear Physics, 630090 Novosibirsk (Russian Federation)

    2005-05-15T23:59:59.000Z

    A new operating mode of the plasma wakefield accelerator is found at which high efficiency of the driver-to-witness energy exchange can be achieved simultaneously with high transformer ratio and low energy spread. The efficient acceleration is realized in the blowout regime with a high-current moderate-length driver, if most of the driver and the whole witness are inside the cavern, and the beams are shaped to flatten the profile of the longitudinal electric field. The efficient regime can be demonstrated with state-of-the-art electron beams, but requires a longitudinal compression of the drive beam, high density plasma, and precise control of driver and witness shapes.

  6. Generation of Geodesic Acoustic Modes in ITG turbulence

    SciTech Connect (OSTI)

    Falchetto, G. L.; Garbet, X.; Ottaviani, M. [Association EURATOM-CEA, CEA/DSM/DRFC, Centre de Cadarache, 13108 Saint Paul lez Durance (France); Smolyakov, A. [Department of Physics and Engineering Physics, University of Saskatchewan, SK (Canada)

    2006-11-30T23:59:59.000Z

    The generation of geodesic acoustic modes (GAM) is studied by means of numerical simulations of a 3D fluid global model, describing flux-driven electrostatic ITG (Ion Temperature Gradient) turbulence in the core of tokamak plasmas. The model evolves the equilibrium and the perturbed fields as a whole. The coupling of poloidal harmonics induced by the curvature thus results in the presence of both turbulent and neoclassical transport effects in the system. The neoclassical thermal conductivity, which is linked to the time-independent component of the poloidal modulation of the equilibrium fields, is observed to be of the order of the turbulent one, in a system driven by strong injected heat fluxes. The frequency spectrum of the electrostatic potential fluctuations exhibits a peak near the theoretical GAM frequency. In the turbulent stationary state of the simulations a downshift of the GAM frequency is observed.

  7. Entanglement conditions for two-mode states: Applications

    E-Print Network [OSTI]

    Hillery, Mark; Zubairy, M. Suhail

    2006-01-01T23:59:59.000Z

    on the entanglement condition #5;#6;ab?#7;#5;2 #1; #6;NaNb#7; , #1;1#2; that is, if the two modes are in a state for which the above inequality is satisfied, the state is entangled #3;13#4;. The quan- tities in this inequality can be measured in a relatively... that #5;#6;ab?#7;#5;2= #6;NaNb#7;. One way of possibly finding states that satisfy our entangle- ment condition, Eq. #1;1#2;, is to start with a product of coherent states and perturbing this state in such a way as to produce entanglement. We give two...

  8. Spatiotemporal reconstruction of list-mode PET data

    SciTech Connect (OSTI)

    Nichols, Thomas E.; Qi, Jinyi; Asma, Evren; Leahy, Richard M.

    2002-03-01T23:59:59.000Z

    We describe a method for computing a continuous time estimate of tracer density using list-mode positron emission tomography data. The rate function in each voxel is modeled as an inhomogeneous Poisson process whose rate function can be represented using a cubic B-spline basis. The rate functions are estimated by maximizing the likelihood of the arrival times of detected photon pairs over the control vertices of the spline, modified by quadratic spatial and temporal smoothness penalties and a penalty term to enforce nonnegativity. Randoms rate functions are estimated by assuming independence between the spatial and temporal randoms distributions. Similarly, scatter rate functions are estimated by assuming spatiotemporal independence and that the temporal distribution of the scatter is proportional to the temporal distribution of the trues. A quantitative evaluation was performed using simulated data and the method is also demonstrated in a human study using 11C-raclopride.

  9. Phonon-roton modes of liquid 4He beyond the roton in MCM-41

    SciTech Connect (OSTI)

    Azuah, Richard T [NIST Center for Neutron Research (NCRN), Gaithersburg, MD] NIST Center for Neutron Research (NCRN), Gaithersburg, MD; Omar Diallo, Souleymane [ORNL] ORNL; Adams, Mark A. [ISIS Facility, Rutherford Appleton Laboratory (ISIS)] ISIS Facility, Rutherford Appleton Laboratory (ISIS); Kirichek, Oleg [ISIS Facility, Rutherford Appleton Laboratory (ISIS)] ISIS Facility, Rutherford Appleton Laboratory (ISIS); Glyde, Henry R [University of Delaware] University of Delaware

    2013-01-01T23:59:59.000Z

    We present neutron scattering measurements of the phonon-roton (P-R) mode of superfluid 4He confined in 47 A MCM-41 at T = 0.5 K at wave vectors, Q, beyond the roton wave vector (QR = 1.92 A-1). Measurements beyond the roton require access to high wave vectors (up to Q = 4 A-1) with excellent energy resolution and high statistical precision. The present results show for the first time that at T = 0.5 K the P-R mode in MCM-41 extends out to wave-vector Q 3.6 A-1 with the same energy and zero width (within precision) as observed in bulk superfluid 4He. Layer modes in the roton region are also observed. Specifically, the P-R mode energy, !Q, increases with Q for Q > QR and reaches a plateau at a maximum energy !Q = 2 where is the roton energy, = 0.74 0.01 meV in MCM-41. This upper limit means the P-R mode decays to two rotons when its energy exceeds 2 . It also means that the P-R mode does not decay to two layers modes. If the P-R could decay to two layer modes, !Q would plateau at a lower energy, !Q = 2 L where L = 0.60 meV is the energy of the roton like minimum of the layer mode. The observation of the P-R mode with energy up to 2 shows that the P-R mode and the layer modes are independent modes with apparently little interaction between them.

  10. Atomic nuclei decay modes by spontaneous emission of heavy ions

    SciTech Connect (OSTI)

    Poenaru, D.N.; Ivascu, M.; Sndulescu, A.; Greiner, W.

    1985-08-01T23:59:59.000Z

    The great majority of the known nuclides with Z>40, including the so-called stable nuclides, are metastable with respect to several modes of spontaneous superasymmetric splitting. A model extended from the fission theory of alpha decay allows one to estimate the lifetimes and the branching ratios relative to the alpha decay for these natural radioactivities. From a huge amount of systematic calculations it is concluded that the process should proceed with maximum intensity in the trans-lead nuclei, where the minimum lifetime is obtained from parent-emitted heavy ion combinations leading to a magic (/sup 208/Pb) or almost magic daughter nucleus. More than 140 nuclides with atomic number smaller than 25 are possible candidates to be emitted from heavy nuclei, with half-lives in the range of 10/sup 10/--10/sup 30/ s: /sup 5/He, /sup 8en-dash10/Be, /sup 11,12/B, /sup 12en-dash16/C, /sup 13en-dash17/N, /sup 15en-dash22/O, /sup 18en-dash23/F, /sup 20en-dash26/Ne, /sup 23en-dash28/Na, /sup 23en-dash30/Mg, /sup 27en-dash32/Al, /sup 28en-dash36/Si, /sup 31en-dash39/P, /sup 32en-dash42/S, /sup 35en-dash45/Cl, /sup 37en-dash47/Ar, /sup 40en-dash49/ K, . .Ca, /sup 44en-dash53/ Sc, /sup 46en-dash53/Ti, /sup 48en-dash54/V, and /sup 49en-dash55/ Cr. The shell structure and the pairing effects are clearly manifested in these new decay modes.

  11. Benchmarking kinetic calculations of resistive wall mode stability

    SciTech Connect (OSTI)

    Berkery, J. W.; Sabbagh, S. A. [Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States)] [Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States); Liu, Y. Q. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)] [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom); Wang, Z. R.; Logan, N. C.; Park, J.-K.; Manickam, J. [Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)] [Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States); Betti, R. [Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)] [Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)

    2014-05-15T23:59:59.000Z

    Validating the calculations of kinetic resistive wall mode (RWM) stability is important for confidently predicting RWM stable operating regions in ITER and other high performance tokamaks for disruption avoidance. Benchmarking the calculations of the Magnetohydrodynamic Resistive Spectrum—Kinetic (MARS-K) [Y. Liu et al., Phys. Plasmas 15, 112503 (2008)], Modification to Ideal Stability by Kinetic effects (MISK) [B. Hu et al., Phys. Plasmas 12, 057301 (2005)], and Perturbed Equilibrium Nonambipolar Transport (PENT) [N. Logan et al., Phys. Plasmas 20, 122507 (2013)] codes for two Solov'ev analytical equilibria and a projected ITER equilibrium has demonstrated good agreement between the codes. The important particle frequencies, the frequency resonance energy integral in which they are used, the marginally stable eigenfunctions, perturbed Lagrangians, and fluid growth rates are all generally consistent between the codes. The most important kinetic effect at low rotation is the resonance between the mode rotation and the trapped thermal particle's precession drift, and MARS-K, MISK, and PENT show good agreement in this term. The different ways the rational surface contribution was treated historically in the codes is identified as a source of disagreement in the bounce and transit resonance terms at higher plasma rotation. Calculations from all of the codes support the present understanding that RWM stability can be increased by kinetic effects at low rotation through precession drift resonance and at high rotation by bounce and transit resonances, while intermediate rotation can remain susceptible to instability. The applicability of benchmarked kinetic stability calculations to experimental results is demonstrated by the prediction of MISK calculations of near marginal growth rates for experimental marginal stability points from the National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40, 557 (2000)].

  12. High-Throughput Mode Liquid Microjunction Surface Sampling Probe

    SciTech Connect (OSTI)

    Van Berkel, Gary J [ORNL; Kertesz, Vilmos [ORNL; King, Richard C. [PharmaCadence

    2009-01-01T23:59:59.000Z

    A simple and automated spot sampling operation mode for a liquid microjunction surface sampling probe/electrospray ionization mass spectrometry (LMJ-SSP/ESI-MS) system is reported. Prior manual and automated spot sampling methods with this probe relied on a careful, relatively slow alignment of the probe and surface distance (<20 m spacing) to form the probe-to-surface liquid microjunction critical to successful surface sampling. Moreover, sampling multiple spots required retraction of the surface from the probe and a repeat of this careful probe-to-surface distance alignment at the next sampling position. With the method described here, the probe was not positioned as close to the surface, the exact probeto-surface positioning was found to be less critical (spanning distances from about 100-300 m), and this distance was not altered during the sampling of an entire array of sample spots. With the probe positioned within the appropriate distance from the surface, the liquid microjunction was formed by letting the liquid from the sampling end of the probe extend out from the probe to the surface. This was accomplished by reducing the selfaspiration liquid flow rate of the probe to a value less than the volume flow rate pumped into the probe. When the self-aspiration rate of the probe was subsequently increased, analytes on the surface that dissolved at the liquid microjunction were aspirated back into the probe with the liquid that created the liquid microjunction and electrosprayed. Presented here are the basics of this new sampling mode, as well as data that illustrate the potential analytical capabilities of the device to conduct highthroughput quantitative analysis.

  13. Field Quantization, Photons and Non-Hermitean Modes

    E-Print Network [OSTI]

    S. A. Brown; B. J. Dalton

    2001-09-10T23:59:59.000Z

    Field quantization in three dimensional unstable optical systems is treated by expanding the vector potential in terms of non-Hermitean (Fox-Li) modes in both the cavity and external regions. The cavity non-Hermitean modes (NHM) are treated using the paraxial and monochromaticity approximations. The NHM bi-orthogonality relationships are used in a standard canonical quantization procedure based on introducing generalised coordinates and momenta for the electromagnetic (EM) field. The quantum EM field is equivalent to a set of quantum harmonic oscillators (QHO), associated with either the cavity or the external region NHM. This confirms the validity of the photon model in unstable optical systems, though the annihilation and creation operators for each QHO are not Hermitean adjoints. The quantum Hamiltonian for the EM field is the sum of non-commuting cavity and external region contributions, each of which is sum of independent QHO Hamiltonians for each NHM, but the external field Hamiltonian also includes a coupling term responsible for external NHM photon exchange processes. Cavity energy gain and loss processes is associated with the non-commutativity of cavity and external region operators, given in terms of surface integrals involving cavity and external region NHM functions on the cavity-external region boundary. The spontaneous decay of a two-level atom inside an unstable cavity is treated using the essential states approach and the rotating wave approximation. Atomic transitions leading to cavity NHM photon absorption have a different coupling constant to those leading to photon emission, a feature resulting from the use of NHM functions. Under certain conditions the decay rate is enhanced by the Petermann factor.

  14. One-dimensional full wave simulation on XB mode conversion in electron cyclotron heating

    SciTech Connect (OSTI)

    Kim, S. H., E-mail: shkim95@kaeri.re.kr [Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea, Republic of); Lee, H. Y.; Jo, J. G.; Hwang, Y. S. [Seoul National University, Seoul 151-742 (Korea, Republic of)

    2014-06-15T23:59:59.000Z

    The XB mode conversion in electron cyclotron resonance frequency heating has been studied in detail through 1D full wave simulation. The field pattern depends on the density scale length, and the wave absorption near upper hybrid resonance is maximized beyond the R(X) mode cutoff density for optimized density scale length. The simulated mode conversion efficiency has been compared with that of an analytic formula, showing good agreements except for the phase dependent term of the X wave. The mode conversion efficiency is calculated for oblique injections as well, and it is found that the efficiency decreases as the injection angles increases. Short magnetic field scale length is confirmed to relax the short density scale length condition maximizing the XB mode conversion efficiency. Finally, the simulation code is used to analyze the mode conversion and power absorption of a pre-ionization plasma in versatile experiment spherical torus.

  15. Measurement of Coupling PDC photon sources with single-mode and multimode optical fibers

    E-Print Network [OSTI]

    Stefania Castelletto; Ivo Pietro Degiovanni; Alan Migdall; Valentina Schettini; Michael Ware

    2004-08-03T23:59:59.000Z

    We investigate the coupling efficiency of parametric downconversion light (PDC) into single and multi-mode optical fibers as a function of the pump beam diameter, crystal length and walk-off. We outline two different theoretical models for the preparation and collection of either single-mode or multi-mode PDC light (defined by, for instance, multi-mode fibers or apertures, corresponding to bucket detection). Moreover, we define the mode-matching collection efficiency, important for realizing a single-photon source based on PDC output into a well-defined single spatial mode. We also define a multimode collection efficiency that is useful for single-photon detector calibration applications.

  16. Measurement of Coupling PDC photon sources with single-mode and multimode optical fibers

    E-Print Network [OSTI]

    Castelletto, S; Migdal, A; Schettini, V; Ware, M; Castelletto, Stefania; Degiovanni, Ivo Pietro; Migdall, Alan; Schettini, Valentina; Ware, Michael

    2004-01-01T23:59:59.000Z

    We investigate the coupling efficiency of parametric downconversion light (PDC) into single and multi-mode optical fibers as a function of the pump beam diameter, crystal length and walk-off. We outline two different theoretical models for the preparation and collection of either single-mode or multi-mode PDC light (defined by, for instance, multi-mode fibers or apertures, corresponding to bucket detection). Moreover, we define the mode-matching collection efficiency, important for realizing a single-photon source based on PDC output into a well-defined single spatial mode. We also define a multimode collection efficiency that is useful for single-photon detector calibration applications.

  17. Magneto-hydrodynamics simulation study of deflagration mode in co-axial plasma accelerators

    SciTech Connect (OSTI)

    Sitaraman, Hariswaran; Raja, Laxminarayan L. [Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712 (United States)] [Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712 (United States)

    2014-01-15T23:59:59.000Z

    Experimental studies by Poehlmann et al. [Phys. Plasmas 17(12), 123508 (2010)] on a coaxial electrode magnetohydrodynamic (MHD) plasma accelerator have revealed two modes of operation. A deflagration or stationary mode is observed for lower power settings, while higher input power leads to a detonation or snowplow mode. A numerical modeling study of a coaxial plasma accelerator using the non-ideal MHD equations is presented. The effect of plasma conductivity on the axial distribution of radial current is studied and found to agree well with experiments. Lower conductivities lead to the formation of a high current density, stationary region close to the inlet/breech, which is a characteristic of the deflagration mode, while a propagating current sheet like feature is observed at higher conductivities, similar to the detonation mode. Results confirm that plasma resistivity, which determines magnetic field diffusion effects, is fundamentally responsible for the two modes.

  18. Optimum phase noise reduction and repetition rate tuning in quantum-dot mode-locked lasers

    SciTech Connect (OSTI)

    Habruseva, T. [CAPPA, Cork Institute of Technology, Cork (Ireland); Tyndall National Institute, Lee Maltings, Cork (Ireland); Aston University, Aston Triangle, B4 7ET Birmingham (United Kingdom); Arsenijevi?, D.; Kleinert, M.; Bimberg, D. [Institut für Festkörperphysik, Technische Universität Berlin, Berlin (Germany); Huyet, G.; Hegarty, S. P. [CAPPA, Cork Institute of Technology, Cork (Ireland); Tyndall National Institute, Lee Maltings, Cork (Ireland)

    2014-01-13T23:59:59.000Z

    Competing approaches exist, which allow control of phase noise and frequency tuning in mode-locked lasers, but no judgement of pros and cons based on a comparative analysis was presented yet. Here, we compare results of hybrid mode-locking, hybrid mode-locking with optical injection seeding, and sideband optical injection seeding performed on the same quantum dot laser under identical bias conditions. We achieved the lowest integrated jitter of 121 fs and a record large radio-frequency (RF) tuning range of 342?MHz with sideband injection seeding of the passively mode-locked laser. The combination of hybrid mode-locking together with optical injection-locking resulted in 240 fs integrated jitter and a RF tuning range of 167?MHz. Using conventional hybrid mode-locking, the integrated jitter and the RF tuning range were 620 fs and 10?MHz, respectively.

  19. Slanted Annular Aperture Arrays as enhanced-transmission metamaterials: excitation of the plasmonic transverse electromagnetic guided mode

    E-Print Network [OSTI]

    Boyer, Edmond

    transverse electromagnetic guided mode Abdoulaye Ndao1, Abderrahmane Belkhir2, Roland Salut1 and Fadi I

  20. Hopf-Turing mixed mode and pattern selection in reaction diffusion systems

    E-Print Network [OSTI]

    A. Bhattacharyay

    2001-11-27T23:59:59.000Z

    The amplitude equation of Gierer-Mainhardt model has been actually derived near the boundary abuot which Turing and Hopf modes exist. In a parameter region where Hopf-Turing mixed mode solution is stable, a chaotic state that generally results from interaction between mixed modes, is observed. This chaotic region follows a strong selection of a spatially periodic order followed by a local, resonant, very large frequency temporal oscillation. A spatio-temporal forcing, responsible for what obseved, has been identified.

  1. Nuclear reaction rates and energy in stellar plasmas : The effect of highly damped modes

    E-Print Network [OSTI]

    Merav Opher; Luis O. Silva; Dean E. Dauger; Viktor K. Decyk; John M. Dawson

    2001-05-09T23:59:59.000Z

    The effects of the highly damped modes in the energy and reaction rates in a plasma are discussed. These modes, with wavenumbers $k \\gg k_{D}$, even being only weakly excited, with less than $k_{B}T$ per mode, make a significant contribution to the energy and screening in a plasma. When the de Broglie wavelength is much less than the distance of closest approach of thermal electrons, a classical analysis of the plasma can

  2. New method for computing ideal MHD normal modes in axisymmetric toroidal geometry

    SciTech Connect (OSTI)

    Wysocki, F.; Grimm, R.C.

    1984-11-01T23:59:59.000Z

    Analytic elimination of the two magnetic surface components of the displacement vector permits the normal mode ideal MHD equations to be reduced to a scalar form. A Galerkin procedure, similar to that used in the PEST codes, is implemented to determine the normal modes computationally. The method retains the efficient stability capabilities of the PEST 2 energy principle code, while allowing computation of the normal mode frequencies and eigenfunctions, if desired. The procedure is illustrated by comparison with earlier various of PEST and by application to tilting modes in spheromaks, and to stable discrete Alfven waves in tokamak geometry.

  3. modes are nearly completely restored after ther-mal treatment. Similarly, electronic transitions in

    E-Print Network [OSTI]

    Stüwe, Jogy

    modes are nearly completely restored after ther- mal treatment. Similarly, electronic transitions, 338 (2003). 13. D. Chattopadhyay, I. Galeska, F. Papadimitrakopoulos, J. Am. Chem. Soc. 125, 3370

  4. Design and Analysis of a Mach 3 Dual Mode Scramjet Combustor.

    E-Print Network [OSTI]

    Corbin, Christopher Ryan

    2008-01-01T23:59:59.000Z

    ??Low speed operation of a dual mode scramjet engine is important to the development of a two stage to orbit reusable launch vehicle. This study… (more)

  5. E-Print Network 3.0 - applying failure mode Sample Search Results

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

    the failure mode space of aerospace ... Source: Stone, Robert B. - School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University Collection: Engineering...

  6. Experimental aspects of effects of high-energy particles on Alfven modes

    SciTech Connect (OSTI)

    Heidbrink, W.W.

    1994-10-01T23:59:59.000Z

    Global Alfven modes are observed in a number of tokamaks, including DIII-D and TFTR. Instabilities occur during neutral-beam injection and during fast-wave ICRF heating, and may recently have been observed during alpha-particle heating. Identification of toroidicity-induced Alfven eigenmodes (TAE) is based primarily on the scaling of the real frequency of the mode. Other modes, including the beta-induced Alfven eigenmode (BAE), are also observed. The stability threshold of TAE modes agree (to within a factor of two) with theoretical predictions. Toroidal mode numbers of n = 2-6 are usually most unstable, as theoretically expected. Measurements of the poloidal and radial mode structure are consistent with theoretical predictions, but the uncertainties are large. Both TAE and BAE modes can cause large, concentrated losses of fast ions. Phenomenologically, beam-driven Alfven modes usually {open_quotes}saturate{close_quotes} through bursts that expel beam ions, while modes observed during ICPF heating approach a steady saturation amplitude.

  7. Progress In Understanding The Enhanced Petestal H-mode In NSTX

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

    Gerhardt, S. P. [Princeton Plasma Physics Laboratory; Canik, J. M. [ORNL; Maingi, R. [PPPL; Battaglia, D. [PPPL; Bell, R. E. [PPPL; Guttenfelder, W. [PPPL; LeBlanc, B. P. [PPPL; Smith, D. R. [U. Wisconsin-Madison; Yuh, H. [Nova Photonics; Sabbagh, S. [Columbia Univ

    2014-06-02T23:59:59.000Z

    The paper describes the enhanced pedestal (EP) H-mode observed in the National Spherical Torus Experiment (NSTX). The defining characteristics of EP H-mode are given, namely i)transition after the L- to H-mode transition, ii) region of very steep ion temperature gradient, and iii) associated region of strong rotational shear. A newly observed long-pulse EP H-mode example shows quiescent behavior for as long as the heating and current drive sources are maintained. Cases are shown where the region of steep ion temperature gradient is located at the very edge, and cases where it is shifted up to 10 cm inward from the plasma edge; these cases are united by a common dependence of the ion temperature gradient on the toroidal rotation frequency shear. EP H-mode examples have been observed across a wide range of q95 and pedestal collisionality. No strong changes in the fluctuation amplitudes have been observed following the eP H-mode transition, and transport analysis indicates that the ion t hermal transport is comparable to or less than anticipated from a simple neoclassical transport model. Cases are shown where EP H-modes were reliably generated, through these low-q95 examples were difficult to sustain. A case where an externally triggered ELM precipitates the transition to EP H-mode is also shown, though an initial experiment designed to trigger EP-H-modes in this fashion was successful.

  8. Mixed Mode Static and Fatigue Crack Growth in Wind Blade Paste Adhesives

    E-Print Network [OSTI]

    , static GIc and mixed mode fracture, and fatigue crack growth resistance. I. Introduction Wind turbine blades are large composite structures which are typically resin infusion molded in sections

  9. Progress In Understanding The Enhanced Petestal H-mode In NSTX

    SciTech Connect (OSTI)

    none,

    2014-06-26T23:59:59.000Z

    ThIS paper describes the enhanced pedestal (EP) H-mode observed in the National Spherical Torus Experiment (NSTX). The defining characteristics of EP H-mode are given, namely i)transition after the L- to H-mode transition, ii) region of very steep ion temperature gradient, and iii) associated region of strong rotational shear. A newly observed long-pulse EP H-mode example shows quiescent behavior for as long as the heating and current drive sources are maintained. Cases are shown where the region of steep ion temperature gradient is located at the very edge, and cases where it is shifted up to 10 cm inward from the plasma edge; these cases are united by a common dependence of the ion temperature gradient on the toroidal rotation frequency shear. EP H-mode examples have been observed across a wide range of q95 and pedestal collisionality. No strong changes in the fluctuation amplitudes have been observed following the eP H-mode transition, and transport analysis indicates that the ion t hermal transport is comparable to or less than anticipated from a simple neoclassical transport model. Cases are shown where EP H-modes were reliably generated, through these low-q95 examples were difficult to sustain. A case where an externally triggered ELM precipitates the transition to EP H-mode is also shown, though an initial experiment designed to trigger EP-H-modes in this fashion was successful.

  10. E-Print Network 3.0 - acoustic modes induced Sample Search Results

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

    Woods Hole Oceanographic Institution Collection: Engineering 23 Kinetic theory of geodesic acoustic and related modes Summary: Kinetic theory of geodesic acoustic and related...

  11. E-Print Network 3.0 - amplitude inversion mode Sample Search...

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

    Technology (MIT) Collection: Plasma Physics and Fusion 22 Average patterns and coherent phenomena in wide aperture lasers G. D'Alessandro Summary: - tudes of different modes,...

  12. E-Print Network 3.0 - active mode control Sample Search Results

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

    Summary: simple features have few features active Jan Bredereke: On Preventing FIs which are Shared-Control Mode... On Preventing Telephony Feature Interactions which are...

  13. Nonlinear mechanism of charge-qubit decoherence in a lossy cavity: Quasi-normal-mode approach

    SciTech Connect (OSTI)

    Gao, Y.B. [Department of Applied Physics, Beijing University of Technology, Beijing 100022 (China); Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080 (China); Wang, Y.D. [Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080 (China); Sun, C.P. [Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080 (China); Department of Physics, Nankai University, Tianjin 300071 (China)

    2005-03-01T23:59:59.000Z

    From the viewpoint of quasinormal modes, we describe a decoherence mechanism of charge qubit of Josephson junctions (JJ) in a lossy microcavity, which can appear in a realistic experiment for quantum computation based on a JJ qubit. We show that nonlinear coupling of a charge qubit to the quantum cavity field can result in additional dissipation of the resonant mode due to the effective interaction between those nonresonant modes and the resonant mode, which is induced by the charge qubit itself. We calculate the characteristic time of the decoherence by making use of the system plus bath method.

  14. Systems acceptance and operability testing for rotary mode core sampling in flammable gas tanks

    SciTech Connect (OSTI)

    Corbett, J.E., Westinghouse Hanford

    1996-07-29T23:59:59.000Z

    This document provides instructions for the system acceptance and operability testing of the rotary mode core sampling system, modified for use in flammable gas tanks.

  15. Comfort standards and variation in exceedance for mixed-mode buildings.

    E-Print Network [OSTI]

    Brager, Gail; Borgeson, Sam

    2010-01-01T23:59:59.000Z

    a lower carbon society. Building Research & Information, 36(ventilated and mixed-mode buildings – Part I: Thermalmodeling. Building and Environment, 44(4), 736–749.

  16. Mode Coupling of Phonons in a Dense One-Dimensional Microfluidic Crystal

    E-Print Network [OSTI]

    Jean-Baptiste Fleury; Ulf D Schiller; Shashi Thutupalli; Gerhard Gompper; Ralf Seemann

    2013-10-14T23:59:59.000Z

    Long-living coupled transverse and longitudinal phonon modes are explored in dense and regular arrangements of flat microfluidic droplets. The collective oscillations are driven by hydrodynamic interactions between the confined droplets and can be excited in a controlled way. Experimental results are quantitatively compared to simulation results obtained by multi-particle collision dynamics. The observed transverse modes are acoustic phonons and can be described by a linearized far-field theory, whereas the longitudinal modes arise from a non-linear mode coupling due to the lateral variation of the flow field under confinement.

  17. E-Print Network 3.0 - adaptive sliding mode Sample Search Results

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

    Abstract: Sliding mode control is introduced into classical model free fuzzy logic control for discrete... time nonlinear systems with uncertainty to the design of a...

  18. Anthraquinone Photonuclease Structure Determines Its Mode of Binding to DNA and the Cleavage

    E-Print Network [OSTI]

    Williams, Loren

    Anthraquinone Photonuclease Structure Determines Its Mode of Binding to DNA and the Cleavage recently described a set of anthraquinone derivatives that act as photonucleases.6 Three classes

  19. Progress in understanding the enhanced pedestal H-mode in NSTX

    SciTech Connect (OSTI)

    Gerhardt, S.P.; Canik, J.M; Maingi, R.; Battaglia, D.; Bell, R.E.; Guttenfelder, W.; LeBlanc, B.P.; Smith, D.R.; Yuh, H.; Sabbagh, S.

    2014-08-01T23:59:59.000Z

    The paper describes the enhanced pedestal (EP) H-mode observed in the National Spherical Torus Experiment (NSTX). The defining characteristics of EP H-mode are given, namely i)transition after the L- to H-mode transition, ii) region of very steep ion temperature gradient, and iii) associated region of strong rotational shear. A newly observed long-pulse EP H-mode example shows quiescent behavior for as long as the heating and current drive sources are maintained. Cases are shown where the region of steep ion temperature gradient is located at the very edge, and cases where it is shifted up to 10 cm inward from the plasma edge; these cases are united by a common dependence of the ion temperature gradient on the toroidal rotation frequency shear. EP H-mode examples have been observed across a wide range of q95 and pedestal collisionality. No strong changes in the fluctuation amplitudes have been observed following the eP H-mode transition, and transport analysis indicates that the ion t hermal transport is comparable to or less than anticipated from a simple neoclassical transport model. Cases are shown where EP H-modes were reliably generated, through these low-q95 examples were difficult to sustain. A case where an externally triggered ELM precipitates the transition to EP H-mode is also shown, though an initial experiment designed to trigger EP-H-modes in this fashion was successful.

  20. Control Strategies for HCCI Mixed-Mode Combustion

    SciTech Connect (OSTI)

    Wagner, Robert M [ORNL; Edwards, Kevin Dean [ORNL

    2010-03-01T23:59:59.000Z

    Delphi Automotive Systems and ORNL established this CRADA to expand the operational range of Homogenous Charge Compression Ignition (HCCI) mixed-mode combustion for gasoline en-gines. ORNL has extensive experience in the analysis, interpretation, and control of dynamic engine phenomena, and Delphi has extensive knowledge and experience in powertrain compo-nents and subsystems. The partnership of these knowledge bases was important to address criti-cal barriers associated with the realistic implementation of HCCI and enabling clean, efficient operation for the next generation of transportation engines. The foundation of this CRADA was established through the analysis of spark-assisted HCCI data from a single-cylinder research engine. This data was used to (1) establish a conceptual kinetic model to better understand and predict the development of combustion instabilities, (2) develop a low-order model framework suitable for real-time controls, and (3) provide guidance in the initial definition of engine valve strategies for achieving HCCI operation. The next phase focused on the development of a new combustion metric for real-time characterization of the combustion process. Rapid feedback on the state of the combustion process is critical to high-speed decision making for predictive control. Simultaneous to the modeling/analysis studies, Delphi was focused on the development of engine hardware and the engine management system. This included custom Delphi hardware and control systems allowing for flexible control of the valvetrain sys-tem to enable HCCI operation. The final phase of this CRADA included the demonstration of conventional and spark assisted HCCI on the multi-cylinder engine as well as the characterization of combustion instabilities, which govern the operational boundaries of this mode of combustion. ORNL and Delphi maintained strong collaboration throughout this project. Meetings were held on a bi-weekly basis with additional reports, presentation, and meetings as necessary to maintain progress. Delphi provided substantial support through modeling, hardware, data exchange, and technical consultation. This CRADA was also successful at establishing important next steps to further expanding the use of an HCCI engine for improved fuel efficiency and emissions. These topics will be address in a follow-on CRADA. The objectives are: (1) Improve fundamental understanding of the development of combustion instabilities with HCCI operation through modeling and experiments; (2) Develop low-order model and feedback combustion metrics which are well suited to real-time predictive controls; and (3) Construct multi-cylinder engine system with advanced Delphi technologies and charac-terize HCCI behavior to better understand limitations and opportunities for expanded high-efficiency operation.

  1. Gravity modes and mixed modes as probes of stellar cores in main-sequence stars: from solar-like to beta Cep stars

    E-Print Network [OSTI]

    A. Miglio; J. Montalban; P. Eggenberger; A. Noels

    2007-12-20T23:59:59.000Z

    We investigate how the frequencies of gravity modes depend on the detailed properties of the chemical composition gradient that develops near the core of main-sequence stars and, therefore, on the transport processes that are able to modify the \\mu profile in the central regions. We show that in main-sequence models, similarly to the case of white dwarfs, the periods of high-order gravity modes are accurately described by a uniform period spacing superposed to an oscillatory component. The periodicity and amplitude of such component are related, respectively, to the location and sharpness of the \\mu gradient. We briefly discuss and interpret, by means of this simple approximation, the effect of turbulent mixing near the core on the periods of both high-order and low-order g modes, as well as of modes of mixed pressure-gravity character.

  2. Modes of Action of Trichloroethylene for Kidney Tumorigenesis

    E-Print Network [OSTI]

    Lawrence H. Lash; Jean C. Parker; Cheryl Siegel Scott

    This article focuses on the various models for kidney toxicity due to trichloroethylene (TCE) and its glutathione-dependent metabolites, in particular S-(1,2-dichlorovinyl)-L-cysteine. Areas of controversy regarding the relative importance of metabolic pathways, species differences in toxic responses, rates of generation of reactive metabolites, and dose-dependent phenomena are highlighted. The first section briefly reviews information on the incidence and risk factors of kidney cancer in the general U.S. population. Epidemiological data on incidence of kidney cancer in male workers exposed occupationally to TCE are also summarized. This is contrasted with cancer bioassay data from laboratory animals, that highlights sex and species differences and, consequently, the difficulties in making risk assessments for humans based on animal data. The major section of the article considers proposed modes of action for TCE or its metabolites in kidney, including peroxisome proliferation, a2u-globulin nephropathy, genotoxicity, and acute and chronic toxicity mechanisms. The latter comprise oxidative stress, alterations in calcium ion homeostasis, mitochondrial dysfunction, protein alkylation, cellular repair processes, and alterations in gene expression and cell proliferation. Finally, the status of risk assessment for TCE based on the kidneys as a target organ and remaining questions and research needs are

  3. Can dispersal mode predict corridor effects on plant parasites?

    SciTech Connect (OSTI)

    Sullivan, Lauren, L.; Johnson, Brenda, L.; Brudvig, Lars, A.; Haddad, Nick, M.

    2011-08-01T23:59:59.000Z

    Habitat corridors, a common management strategy for increasing connectivity in fragmented landscapes, have experimentally validated positive influences on species movement and diversity. However, long-standing concerns that corridors could negatively impact native species by spreading antagonists, such as disease, remain largely untested. Using a large-scale, replicated experiment, we evaluated whether corridors increase the incidence of plant parasites. We found that corridor impacts varied with parasite dispersal mode. Connectivity provided by corridors increased incidence of biotically dispersed parasites (galls on Solidago odora) but not of abiotically dispersed parasites (foliar fungi on S. odora and three Lespedeza spp.). Both biotically and abiotically dispersed parasites responded to edge effects, but the direction of responses varied across species. Although our results require additional tests for generality to other species and landscapes, they suggest that, when establishing conservation corridors, managers should focus on mitigating two potential negative effects: the indirect effects of narrow corridors in creating edges and direct effects of corridors in enhancing connectivity of biotically dispersed parasites.

  4. The pulsation modes, masses and evolution of luminous red giants

    E-Print Network [OSTI]

    Wood, P R

    2015-01-01T23:59:59.000Z

    The period-luminosity sequences and the multiple periods of luminous red giant stars are examined using the OGLE III catalogue of long-period variables in the Large Magellanic Cloud. It is shown that the period ratios in individual multimode stars are systematically different from the ratios of the periods at a given luminosity of different period-luminosity sequences. This leads to the conclusion that the masses of stars at the same luminosity on the different period-luminosity sequences are different. An evolutionary scenario is used to show that the masses of stars on adjacent sequences differ by about 16-26% at a given luminosity, with the shorter period sequence being more massive. The mass is also shown to vary across each sequence by a similar percentage, with the mass increasing to shorter periods. On one sequence, sequence B, the mass distribution is shown to be bimodal. It is shown that the small amplitude variables on sequences A', A and B pulsate in radial and nonradial modes of angular degree l=0...

  5. Description of Stellar Acoustic Modes Using the Local Wave Concept

    E-Print Network [OSTI]

    P. A. P. Nghiem

    2006-06-26T23:59:59.000Z

    An understanding of stellar acoustic oscillations is attempted, using the local wave concept in semi-analytical calculations. The local homogeneity approximation allows to obtain simplified equations that can nevertheless describe the wave behavior down to the central region, as the gravitational potential perturbation is not neglected. Acoustic modes are calculated as classical standing waves in a cavity, by determining the cavity limits and the wave phases at these limits. The internal boundary condition is determined by a fitting with an Airy function. The external boundary condition is defined as the limit where the spatial variation of the background is important compared to the wavelength. This overall procedure is in accordance with the JWKB approximation. When comparing the results with numerical calculations, some drawbacks of the isothermal atmosphere approximation are revealed. When comparing with seismic observations of the Sun, possible improvements at the surface of solar models are suggested. The present semi-analytical method can potentially predict eigenfrequencies at the precision of +-3microHz in the range 800-5600 microHz, for the degrees l=0-10. A numerical calculation using the same type of external boundary conditions could reach a global agreement with observations better than 1 microHz. This approach could contribute to better determine the absolute values of eigenfrequencies for asteroseismology.

  6. Real-time multi-mode neutron multiplicity counter

    DOE Patents [OSTI]

    Rowland, Mark S; Alvarez, Raymond A

    2013-02-26T23:59:59.000Z

    Embodiments are directed to a digital data acquisition method that collects data regarding nuclear fission at high rates and performs real-time preprocessing of large volumes of data into directly useable forms for use in a system that performs non-destructive assaying of nuclear material and assemblies for mass and multiplication of special nuclear material (SNM). Pulses from a multi-detector array are fed in parallel to individual inputs that are tied to individual bits in a digital word. Data is collected by loading a word at the individual bit level in parallel, to reduce the latency associated with current shift-register systems. The word is read at regular intervals, all bits simultaneously, with no manipulation. The word is passed to a number of storage locations for subsequent processing, thereby removing the front-end problem of pulse pileup. The word is used simultaneously in several internal processing schemes that assemble the data in a number of more directly useable forms. The detector includes a multi-mode counter that executes a number of different count algorithms in parallel to determine different attributes of the count data.

  7. MEMS Reliability: Infrastructure, Test Structures, Experiments, and Failure Modes

    SciTech Connect (OSTI)

    TANNER,DANELLE M.; SMITH,NORMAN F.; IRWIN,LLOYD W.; EATON,WILLIAM P.; HELGESEN,KAREN SUE; CLEMENT,J. JOSEPH; MILLER,WILLIAM M.; MILLER,SAMUEL L.; DUGGER,MICHAEL T.; WALRAVEN,JEREMY A.; PETERSON,KENNETH A.

    2000-01-01T23:59:59.000Z

    The burgeoning new technology of Micro-Electro-Mechanical Systems (MEMS) shows great promise in the weapons arena. We can now conceive of micro-gyros, micro-surety systems, and micro-navigators that are extremely small and inexpensive. Do we want to use this new technology in critical applications such as nuclear weapons? This question drove us to understand the reliability and failure mechanisms of silicon surface-micromachined MEMS. Development of a testing infrastructure was a crucial step to perform reliability experiments on MEMS devices and will be reported here. In addition, reliability test structures have been designed and characterized. Many experiments were performed to investigate failure modes and specifically those in different environments (humidity, temperature, shock, vibration, and storage). A predictive reliability model for wear of rubbing surfaces in microengines was developed. The root causes of failure for operating and non-operating MEMS are discussed. The major failure mechanism for operating MEMS was wear of the polysilicon rubbing surfaces. Reliability design rules for future MEMS devices are established.

  8. Global sound modes in mirror traps with anisotropic pressure

    SciTech Connect (OSTI)

    Skovorodin, D. I.; Zaytsev, K. V.; Beklemishev, A. D. [Budker Institute of Nuclear Physics, Novosibirsk State University, Novosibirsk 630090 (Russian Federation)] [Budker Institute of Nuclear Physics, Novosibirsk State University, Novosibirsk 630090 (Russian Federation)

    2013-10-15T23:59:59.000Z

    Global oscillations of inhomogeneous plasma with frequencies close to the bounce frequency of ions in mirror traps have been studied. It has been shown that, in some cases, the sound can be reflected from the axial plasma inhomogeneity. The ideal magnetohydrodynamic (MHD) model with Chew-Goldberger-Low approximation has been utilized to determine conditions of existence of the standing waves in the mirror-confined plasma. Linearized wave equation for the longitudinal plasma oscillations in thin anisotropic inhomogeneous plasma with finite ? has been derived. The wave equation has been treated numerically. The oscillations are studied for the case of the trap with partially filled loss-cone and the trap with sloshing ions. It has been shown that in cells of the multiple-mirror trap standing waves can exist. The frequency of the wave is of the order of the mean bounce-frequency of ions. In the trap with sloshing ions, the mode supported by the pressure of fast ions could exist. The results of oscillations observation in the experiment on the Gas Dynamic Trap have been presented.

  9. Test of molecular mode coupling theory: A first resume

    E-Print Network [OSTI]

    C. Theis; F. Sciortino; A. Latz; R. Schilling; P. Tartaglia

    2000-03-31T23:59:59.000Z

    We report recent progress on the test of mode coupling theory for molecular liquids (MMCT) for molecules of arbitrary shape. The MMCT equations in the long time limit are solved for supercooled water including all molecular degrees of freedom. In contrast to our earlier treatment of water as a linear molecule, we find that the glass transition temperature $T_c$ is overestimated by the theory as was found in the case of simple liquids. The nonergodicity parameters are calculated from the "full" set of MMCT-equations truncated at $l_{co}=2$. These results are compared $(i)$ with the nonergodicity parameters from MMCT with $l_{co}=2$ in the "dipole" approximation $n=n'=0$ and the diagonalization approximation $n=n'=0$,$l=l'$ and $(ii)$ with the corresponding results from a MD-simulation. This work supports the possibility that a reduction to the most prominent correlators may constitute a valid approximation for solving the MMCT equations for rigid molecules.

  10. Power Supply Changes for NSTX Resistive Wall Mode Coils

    SciTech Connect (OSTI)

    Ramakrishnan, S S.

    2013-06-28T23:59:59.000Z

    The National Spherical Torus Experiment (NSTX) has been designed and installed in the existing facilities at Princeton Plasma Physics Laboratory (PPPL). Most of the hardware, plant facilities, auxiliary sub-systems, and power systems originally used for the Tokamak Fusion Test Reactor (TFTR) have been used with suitable modifications to reflect NSTX needs. Prior to 2004, the NSTX power system was feeding twelve (12) circuits in the machine. In 2004 the Resistive Wall Mode (RWM) Coils were installed on the machine to correct error fields. There are six of these coils installed around the machine in the mid-plane. Since these coils need fast and accurate controls, a Switching Power Amplifier (SPA) with three sub-units was procured, installed and commissioned along with other power loop components. Two RWM Coils were connected in series and fed from one SPA sub-unit. After the initial RWM campaign, operational requirements evolved such that each of the RWM coils now requires separate power and control. Hence a second SPA with three sub-units has been procured and installed. The second unit is of improved design and has the controls and power components completely isolated. The existing thyristor rectifier is used as DC Link to both of the Switching Power Amplifiers. The controls for the RWM are integrated into the overall computer control of the DC Power systems for NSTX. This paper describes the design changes in the RWM Power system for NSTX.

  11. A Search for the Decay Modes B +/- to h +/- tau l

    SciTech Connect (OSTI)

    Lees, J.P.

    2012-07-20T23:59:59.000Z

    We present a search for the lepton flavor violating decay modes B{sup {+-}} {yields} h{sup {+-}} {tau}{ell} (h = K, {pi}; {ell} = e, {mu}) using the BABAR data sample, which corresponds to 472 million B{bar B} pairs. The search uses events where one B meson is fully reconstructed in one of several hadronic final states. Using the momenta of the reconstructed B, h, and {ell} candidates, we are able to fully determine the {tau} four-momentum. The resulting {tau} candidate mass is our main discriminant against combinatorial background. We see no evidence for B{sup {+-}} {yields} h{sup {+-}} {tau}{ell} decays and set a 90% confidence level upper limit on each branching fraction at the level of a few times 10{sup -5}.

  12. Topological stability of Majorana zero-modes in superconductor-topological insulator systems

    E-Print Network [OSTI]

    T. Fukui; T. Fujiwara

    2010-01-29T23:59:59.000Z

    We derive an index theorem for zero-energy Majorana fermion modes in a superconductor-topological insulator system in both two and three dimensions, which is valid for models with chiral symmetry as well as particle-hole symmetry. For more generic models without chiral symmetry, we suggest that Majorana zero-modes are classified by Z$_2$.

  13. Northern Hemisphere Modes of Variability and the Timing of Spring in Western North America

    E-Print Network [OSTI]

    by controlling the number and intensity of warm days. There is also a regionwide trend in spring advancement to the atmosphere via carbon and water cycling (Schwartz 1992). Both phenoclimatic indicators (indices based in the biological world may be organized by certain modes of climate variability. If the state of these modes can

  14. Energy of the soliton internal modes and broken symmetries in nonlinear optics

    E-Print Network [OSTI]

    Skryabin, Dmitry

    Energy of the soliton internal modes and broken symmetries in nonlinear optics Dmitry V. Skryabin, in particular, of the negative energy of the internal modes are described in the context of nonlinear optics manuscript received October 3, 2001; accepted October 7, 2001 Applications of the concepts of the energy and

  15. Low TCF Lithium Tantalate Contour Mode Renyuan Wang and Sunil A. Bhave

    E-Print Network [OSTI]

    Afshari, Ehsan

    Low TCF Lithium Tantalate Contour Mode Resonators Renyuan Wang and Sunil A. Bhave OxideMEMS Lab) using Lithium Tantalate (LT). Exploiting the inherent low temperature coefficient of frequency (TCF a promising candidate for oscillator applications. Keywords--Lithium Tantalate, contour mode resonator, low

  16. Sliding Mode Control of Boost Converter: Application to energy storage system via supercapacitors

    E-Print Network [OSTI]

    Boyer, Edmond

    Sliding Mode Control of Boost Converter: Application to energy storage system via supercapacitors», «Robust control», «Supercapacitor». Abstract Sliding mode control of boost converter is studied. In order of an energy storage system based on supercapacitors technology in order to regulate the output voltage. Given

  17. Excitonic effects on radial breathing mode intensity of single wall carbon nanotubes

    E-Print Network [OSTI]

    Maruyama, Shigeo

    Excitonic effects on radial breathing mode intensity of single wall carbon nanotubes Kentaro Satoa Abstract We develop exciton-photon and exciton-phonon interaction matrix elements for sin- gle wall carbon- culate resonance Raman intensity for radial breathing mode as a function of diameter and chiral angle

  18. All-Fiber Pulsed Lasers Passively Mode-Locked by Transferable Vertically Aligned Carbon Nanotube Film

    E-Print Network [OSTI]

    Maruyama, Shigeo

    All-Fiber Pulsed Lasers Passively Mode-Locked by Transferable Vertically Aligned Carbon Nanotube of Tokyo, Tokyo 113-8656, Japan An all-fiber passive laser mode locking is realized with a vertically aligned single-walled carbon nanotube film that can be transferred onto an arbitrary substrate using only

  19. Passively harmonic mode locked erbium doped fiber soliton laser with carbon nanotubes based

    E-Print Network [OSTI]

    Turitsyn, Sergei K.

    Passively harmonic mode locked erbium doped fiber soliton laser with carbon nanotubes based. Tokumoto, H. Kataura, and Y. Achiba, "Sub-200-fs pulsed erbium- doped fiber laser using a carbon nanotube fs erbium-doped fiber laser mode locked with a cellulose polymer film containing single-wall carbon

  20. Mode-Locked Fiber Lasers Using Adjustable Saturable Absorption in Vertically Aligned Carbon Nanotubes

    E-Print Network [OSTI]

    Maruyama, Shigeo

    Mode-Locked Fiber Lasers Using Adjustable Saturable Absorption in Vertically Aligned Carbon, carbon nanotube Passively mode-locked fiber lasers have been used in many applications in various fields or the cleaved fiber end.5) In these studies, we used single-walled carbon nanotubes (SWNTs) whose axial

  1. Toward an energy reduction in mobile relays: combining MIMO and multi-mode

    E-Print Network [OSTI]

    Risset, Tanguy

    communicate on multiple modes using several antennas. However, their energy consumption remains a critical as a possible way to reduce the energy consumption of both the terminals and the network. We propose a realistic providing several commu- nication modes. Nevertheless, their energy consumption remains a limiting factor

  2. Eliminating Design and Execute Modes from Virtual Environment Authoring Gary Marsden & Shih-min Yang

    E-Print Network [OSTI]

    Marsden, Gary

    Eliminating Design and Execute Modes from Virtual Environment Authoring Systems Gary Marsden & Shih a virtual environment authoring tool for novices. In particular we set out to eliminate separate design on the results of a usability experiments comparing each environment. Keywords- Virtual reality authoring, modes

  3. Second-Order Sliding Mode Control for DFIG-Based Wind Turbines

    E-Print Network [OSTI]

    Brest, Université de

    Second-Order Sliding Mode Control for DFIG-Based Wind Turbines Fault Ride-Through Capability-based wind turbine using a high-order sliding mode control. Indeed, it has been recently suggested extra mechanical stress on the wind turbine drive train). Simulations using the NREL FAST code on a 1

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

    E-Print Network [OSTI]

    Boyer, Edmond

    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

  5. TM-mode coupling to a Josephson junction S. J. Lewandowski

    E-Print Network [OSTI]

    Boyer, Edmond

    215 TM-mode coupling to a Josephson junction S. J. Lewandowski Instytut Fizyki PAN, 02-668 Warszawa-mode near cut-off are demonstrated to improve Josephson junction coupling to the waveguide. Revue Phys. Appl Sciences and available at http://dx.doi.org/10.1051/rphysap:01985002003021500 #12;216 Fig. 1. - Josephson

  6. The strength of the radial-breathing mode in single-walled carbon nanotubes

    E-Print Network [OSTI]

    Nabben, Reinhard

    The strength of the radial-breathing mode in single-walled carbon nanotubes M. Machón , S. Reich of the absolute Raman cross section of the radial breathing mode (RBM) of single-walled carbon nanotubes. We compare our calculations to measurements of the absolute Raman cross section of individual nanotubes

  7. The dependence on excitation energy of the D-mode in graphite and carbon nanotubes

    E-Print Network [OSTI]

    Nabben, Reinhard

    The dependence on excitation energy of the D-mode in graphite and carbon nanotubes C. Thomsen, S of carbon nanotubes as well. The corresponding calculated D-mode shift is shown explicitely in the nanotube is seven times narrower than in graphite as agrees with experiment. Graphite was first

  8. New Silicon Carbide Schottky-gate Bipolar Mode Field Effect Transistor (SiC SBMFET)

    E-Print Network [OSTI]

    Kumar, M. Jagadesh

    New Silicon Carbide Schottky-gate Bipolar Mode Field Effect Transistor (SiC SBMFET) without PN. In this paper, we propose a novel Schottky-gate BMFET (SBMFET) using P- type 4H Silicon-Carbide 13,41, a wide, Silicon Carbide, Field effect transistor, Simulation. I. INTRODUCTION TH E BMFET operates in bipolar mode

  9. LHCD and ICRF heating experiments in H-mode plasmas on EAST

    SciTech Connect (OSTI)

    Zhang, X. J.; Zhao, Y. P.; Wan, B. N.; Ding, B. J.; Xu, G. S.; Gong, X. Z.; Li, J. G. [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China); Lin, Y.; Wukitch, S. [MIT Plasma Science and Fusion Center, Cambridge, MA 02139 (United States); Taylor, G. [Princeton Plasma Physics Laboratory (United States); Noterdaeme, J. M. [Max-Planck Institute for Plasma Physics, D-85748, Garching, Germany and University of Gent (Belgium); Braun, F. [Max-Planck Institute for Plasma Physics, D-85748, Garching (Germany); Magne, R.; Litaudon, X. [CEA, IRFM, F-13108 Saint-Paul Lez Durance (France); Kumazawa, R.; Kasahara, H. [National Institute for Fusion Science, Toki (Japan); Collaboration: EAST Team

    2014-02-12T23:59:59.000Z

    An ICRF system with power up to 6.0 MW and a LHCD system up to 4MW have been applied for heating and current drive experiments on EAST. Intensive lithium wall coating was intensively used to reduce particle recycling and Hydrogen concentration in Deuterium plasma, which is needed for effective ICRF and LHCD power absorption in high density plasmas. Significant progress has been made with ICRF heating and LHW current drive for realizing the H-mode plasma operation in EAST. In 2010, H-mode was generated and sustained by LHCD alone, where lithium coating and gas puffing launcher mouth were applied to improve the LHCD power coupling and penetration into the core plasmas at high density of H-modes. During the last two experimental campaigns, ICRF Heating experiments were carried out at the fixed frequency of 27MHz, achieving effective ions and electrons heating with the H Minority Heating (H-MH) mode, where electrons are predominantly heated by collisions with high energy minority ions. The H-MH mode gave the best plasma performance, and realized H-mode alone in 2012. Combination of ICRF and LHW power injection generated the H-mode plasmas with various ELMy characteristics. The first successful application of the ICRF Heating in the D (He3) plasma was also achieved. The progress on ICRF heating, LHCD experiments and their application in achieving H-mode operation from last two years will be discussed in this report.

  10. Efficiency of pump absorption in double-clad fiber amplifiers. III. Calculation of modes

    E-Print Network [OSTI]

    Kouznetsov, Dmitrii

    Efficiency of pump absorption in double-clad fiber amplifiers. III. Calculation of modes Dmitrii us to calculate the efficiency of an incoherent pump in general-geometry double-clad fibers. This approach yields accurate estimates of the absorption rate of each mode of the pump in the first order

  11. Closed Form of the Biphoton K-Vector Spectrum for Arbitrary Spatio-Temporal Pump Modes

    E-Print Network [OSTI]

    Jeffrey Perkins

    2011-09-02T23:59:59.000Z

    A closed form solution is derived for the biphoton k-vector spectrum for an arbitrary pump spatial mode. The resulting mode coefficients for the pump input that maximize the probability of biphoton detection in the far field are found. It is thus possible to include the effect of arbitrary crystal poling strucures, and optimize the resulting biphoton flux.

  12. Cascading process in the flute-mode turbulence of a plasma

    SciTech Connect (OSTI)

    Gonzalez, R.; Gomez, D.; Ferro Fontan, C. (Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, (1428) Buenos Aires (Argentina) Instituto de Astronomia y Fisica del Espacio, C C No. 67, Sucursal 28, (1428) Buenos Aires (Argentina)); Sicardi Schifino, A.C.; Montagne, R. (Instituto de Fisica, Facultad de Ciencias, Universidad de la Republica, CC 10773, CP 11200, Montevideo (Uruguay) Instituto de Fisica, Facultad de Ingenieria, Universidad de la Republica, CC No. 30, CP 11000, Montevideo (Uruguay))

    1993-06-01T23:59:59.000Z

    The cascades of ideal invariants in the flute-mode turbulence are analyzed by considering a statistics based on an elementary three-mode coupling process. The statistical dynamics of the system is investigated on the basis of the existence of the physically most important (PMI) triad. When finite ion Larmor radius effects are considered, the PMI triad describes the formation of zonal flows.

  13. Unified Convolutional/Turbo Decoder Architecture Design Based on Triple-Mode MAP/VA Kernel

    E-Print Network [OSTI]

    Hung, Shih-Hao

    Unified Convolutional/Turbo Decoder Architecture Design Based on Triple-Mode MAP/VA Kernel Fan convolutional/ turbo decoder design. According to the triple-mode MAP/VA timing chart and by merging some similar modules in both the Viterbi decoder and the log-MAP turbo code decoder, we build one unified

  14. High-Order Sliding Mode Control for DFIG-Based Wind Turbine Fault Ride-Through

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    High-Order Sliding Mode Control for DFIG-Based Wind Turbine Fault Ride-Through Mohamed Benbouzid Turbine (WT) using High-Order Sliding Mode (HOSM) control. Indeed, it has been recently suggested wind turbine are carried-out to evaluate ride-through performance of the proposed HOSM control strategy

  15. DFIG Driven Wind Turbine Grid Fault-Tolerance Using High-Order Sliding Mode Control

    E-Print Network [OSTI]

    Boyer, Edmond

    DFIG Driven Wind Turbine Grid Fault-Tolerance Using High-Order Sliding Mode Control Mohamed fault-tolerance of a doubly-fed induction generator- based wind turbine using high-order sliding mode mechanical stress on the drive train). Simulations using the NREL FAST code on a 1.5-MW wind turbine

  16. Ring diagram analysis of the characteristics of solar oscillation modes in active regions

    E-Print Network [OSTI]

    S. P. Rajaguru; Sarbani Basu; H. M. Antia

    2001-08-14T23:59:59.000Z

    The presence of intense magnetic fields in and around sunspots is expected to modify the solar structure and oscillation frequencies. Applying the ring diagram technique to data from the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory (SOHO), we analyze the characteristics of high-degree f and p modes near active regions and compare them with the characteristics of the modes in quiet regions. As expected from earlier results, the f- and p-mode frequencies of high degree modes are found to be significantly larger in magnetically active regions. In addition, we find that the power in both f and p modes is lower in active regions, while the widths of the peaks are larger, indicating smaller lifetimes. We also find that the oscillation modes are more asymmetric in active regions than those in quiet regions, indicating that modes in active regions are excited closer to the surface. While the increase in mode frequency is monotonic in frequency, all other characteristics show more complex frequency dependences.

  17. CYCLIC PLASTICITY OF A CRACKED STRUCTURE SUBJECTED TO MIXED MODE LOADING

    E-Print Network [OSTI]

    CYCLIC PLASTICITY OF A CRACKED STRUCTURE SUBJECTED TO MIXED MODE LOADING Sylvie Pommier1, a 1 LMT, mixed mode crack propagation, plasticity, crack deflection. Abstract. Cyclic plasticity in the crack tip stresses in the overload's plastic zone. Moreover, if the overload's ratio is large enough, the crack may

  18. Monte Carlo simulations of alternative sky observation modes with the Cherenkov Telescope Array

    E-Print Network [OSTI]

    Szanecki, M; Nied?wiecki, A; Sitarek, J; Bednarek, W

    2015-01-01T23:59:59.000Z

    We investigate possible sky survey modes with the Middle Sized Telescopes (MST, aimed at covering the energy range from $\\sim$100 GeV to 10 TeV) subsystem of the Cherenkov Telescope Array (CTA). We use the standard CTA tools, CORSIKA and sim_telarray, to simulate the development of gamma-ray showers, proton background and the telescope response. We perform simulations for the H.E.S.S.-site in Namibia, which is one of the candidate sites for the CTA experiment. We study two previously considered modes, parallel and divergent, and we propose a new, convergent mode with telescopes tilted toward the array center. For each mode we provide performance parameters crucial for choosing the most efficient survey strategy. For the non-parallel modes we study the dependence on the telescope offset angle. We show that use of both the divergent and convergent modes results in potential advantages in comparison with use of the parallel mode. The fastest source detection can be achieved in the divergent mode with larger offs...

  19. NONLINEAR DEVELOPMENT OF THE R-MODE INSTABILITY AND THE MAXIMUM ROTATION RATE OF NEUTRON STARS

    SciTech Connect (OSTI)

    Bondarescu, Ruxandra [Institute for Theoretical Physics, University of Zurich, CH-8057 Zurich (Switzerland); Wasserman, Ira, E-mail: ruxandra@physik.uzh.ch, E-mail: ira@astro.cornell.edu [Center for Radiophysics and Space Research, Cornell University, Ithaca, NY 14853 (United States)

    2013-11-20T23:59:59.000Z

    We describe how the nonlinear development of the R-mode instability of neutron stars influences spin up to millisecond periods via accretion. When nearly resonant interactions of the l = m = 2 R-mode with pairs of 'daughter modes' are included, the R-mode saturates at the lowest amplitude which leads to significant excitation of a pair of modes. The lower bound for this threshold amplitude is proportional to the damping rate of the particular daughter modes that are excited parametrically. We show that if dissipation occurs in a very thin boundary layer at the crust-core boundary, the R-mode saturation amplitude is too large for angular momentum gain from accretion to overcome loss to gravitational radiation. We find that lower dissipation is required to explain spin up to frequencies much higher than 300 Hz. We conjecture that if the transition from the fluid core to the crystalline crust occurs over a distance much longer than 1 cm, then a sharp viscous boundary layer fails to form. In this case, damping is due to shear viscosity dissipation integrated over the entire star. We estimate the lowest parametric instability threshold from first principles. The resulting saturation amplitude is low enough to permit spin up to higher frequencies. The requirement to allow continued spin up imposes an upper bound to the frequencies attained via accretion that plausibly may be about 750 Hz. Within this framework, the R-mode is unstable for all millisecond pulsars, whether accreting or not.

  20. Multi-mode Damage Detection Methods with Piezoelectric Wafer Active Sensors

    E-Print Network [OSTI]

    Giurgiutiu, Victor

    modes structural health monitoring (SHM) and non- destructive evaluation (NDE) simply by changing the driving frequencies. This paper presents research results obtained by using PWAS transducer for SHM/NDE impedance measurements; (3) PWAS ultrasonic SHM/NDE; and (4) PWAS multi-mode corrosion detection

  1. Effects of Modes of Cockpit Automation on Pilot Performance and Workload in a Next Generation

    E-Print Network [OSTI]

    Kaber, David B.

    Effects of Modes of Cockpit Automation on Pilot Performance and Workload in a Next Generation of advanced cockpit automation for flight planning on pilot performance and workload under a futuristic arrivals to an airport using three modes of automation (MOAs), including a control-display unit (CDU

  2. Classification Based Mode Decisions for Video over Networks Deepak S. Turaga and Tsuhan Chen

    E-Print Network [OSTI]

    Chen, Tsuhan

    classification based approach to making such mode decisions accurately and efficiently. We first illustrateClassification Based Mode Decisions for Video over Networks Deepak S. Turaga and Tsuhan Chen Engineering Carnegie Mellon University Pittsburgh, PA 15213 Inter-Intra Decision Regions mrMAD Energy 0 10 20

  3. Standby and off-mode power demand of new appliances in the Anbal de Almeida

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of products. With the 1 W standby initiative of the International Energy Agency (IEA), several low power mode consumption are reviewed. hal-00770133,version1-4Jan2013 Author manuscript, published in "6th International and off-mode energy consumption is illustrated by the fact that the IEA estimates that, even

  4. Two--mode optical tomograms: a possible experimental check of the Robertson uncertainty relations

    E-Print Network [OSTI]

    V. I. Man'ko; G. Marmo; A. Simoni; F. Ventriglia

    2012-02-02T23:59:59.000Z

    The experimental check of two--mode Robertson uncertainty relations and inequalities for highest quadrature moments is suggested by using homodyne photon detection. The relation between optical tomograms and symplectic tomograms is used to connect the tomographic dispersion matrix and the quadrature components dispersion matrix of the two--mode field states.

  5. Global gyrokinetic simulations of the H-mode tokamak edge pedestal

    SciTech Connect (OSTI)

    Wan, Weigang; Parker, Scott E.; Chen, Yang [Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States)] [Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States); Groebner, Richard J. [General Atomics, Post Office Box 85068, San Diego, California 92186 (United States)] [General Atomics, Post Office Box 85068, San Diego, California 92186 (United States); Yan, Zheng [University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)] [University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States); Pankin, Alexei Y.; Kruger, Scott E. [Tech-X Corporation, 5621 Arapahoe Ave., Boulder, Colorado 80305 (United States)] [Tech-X Corporation, 5621 Arapahoe Ave., Boulder, Colorado 80305 (United States)

    2013-05-15T23:59:59.000Z

    Global gyrokinetic simulations of DIII-D H-mode edge pedestal show two types of instabilities may exist approaching the onset of edge localized modes: an intermediate-n, high frequency mode which we identify as the “kinetic peeling ballooning mode (KPBM),” and a high-n, low frequency mode. Our previous study [W. Wan et al., Phys. Rev. Lett. 109, 185004 (2012)] has shown that when the safety factor profile is flattened around the steep pressure gradient region, the high-n mode is clearly kinetic ballooning mode and becomes the dominant instability. Otherwise, the KPBM dominates. Here, the properties of the two instabilities are studied by varying the density and temperature profiles. It is found that the KPBM is destabilized by density and ion temperature gradient, and the high-n mode is mostly destabilized by electron temperature gradient. Nonlinear simulations with the KPBM saturate at high levels. The equilibrium radial electric field (E{sub r}) reduces the transport. The effect of the parallel equilibrium current is found to be weak.

  6. Energetic-Particle-Induced Geodesic Acoustic Mode Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA

    E-Print Network [OSTI]

    , Princeton, New Jersey 08543, USA (Received 24 June 2008; published 30 October 2008) A new energetic particle that energetic particles can indeed excite a new GAM-like mode via free energy associated with velocity space, the new mode, to be called EGAM (for energetic- particle-induced GAM), is intrinsically an energetic parti

  7. Very slow propagating mode at audiofrequencies in gel J. C. Bacri, J. Dumas and A. Levelut

    E-Print Network [OSTI]

    Boyer, Edmond

    dilatational mode in a gel cylinder. 2. Theory. - In order to interpret the present very low frequency. Abstract. 2014 An elastic dilatational mode at very low frequency (100 Hz to 2 000 Hz) has been found vibrations in gel can be studied in three regions of frequencies which give different kinds of informa- tion

  8. HYBRID MODES OF ORGANIZATION Alliances, Joint Ventures, Networks, and other `strange' animals.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 HYBRID MODES OF ORGANIZATION Alliances, Joint Ventures, Networks, and other `strange' animals version: December 2010) halshs-00624291,version1-16Sep2011 #12;2 HYBRID MODES OF ORGANIZATION Alliances of these arrangements, hereafter identified as "hybrids", remains difficult to quantify, they play a major role

  9. STRUCTURE ET DYNAMIOUE DES RESEAUX DETERMINATION OF THE EIGENVECTORS OF SOFT MODES

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Ble du deplacement des atomes dans le mode ferro- klectrique de KDzP04 a l'aide de la mkthode des dries be dropped, since we shall be dealing with only one optic mode at a time). Fourier transformation gives is proportional to b, u,, where b, is the coherent neutron scattering length for an atom of type K. For a phonon

  10. Simulation Model of Common-Mode Chokes for High-Power Applications

    E-Print Network [OSTI]

    Simulation Model of Common-Mode Chokes for High-Power Applications A. Muetze C. R. Sullivan Found;Simulation Model of Common-Mode Chokes for High-Power Applications Charles R. Sullivan Annette Muetze Thayer simulation models for nanocrystalline cores, and compare the results to experimental measurements. We also

  11. Rayleigh-Taylor instability and resulting failure modes of ablatively imploded inertial-fusion targets

    SciTech Connect (OSTI)

    Montierth, L.; Morse, R.

    1983-04-15T23:59:59.000Z

    This article presents a theory of these instabilities and potential modes of failure caused by them. Discussions are given for the following: small amplitude growth of the outside surface instability; and modes of failure resulting from nonlinear development of the inside surface instability.

  12. Failure Mode and Effect Analysis of Concrete Ties in orth America

    E-Print Network [OSTI]

    Barkan, Christopher P.L.

    Engineering University of Illinois at Urbana-Champaign Summary: A failure mode and effect analysis (FMEA in systems and components is the Failure Mode and Effect Analysis (FMEA), and we are applying this approach of concrete ties to take full advantage of their potential. FMEA is an efficient procedure for organizing

  13. Nonlinear evolution of the resistive interchange mode in the cylindrical spheromak

    SciTech Connect (OSTI)

    DeLucia, J.; Jardin, S.C.

    1984-02-01T23:59:59.000Z

    Results are presented of a study of various aspects of the single helicity nonlinear development of the resistive interchange mode in the cylindrical spheromak. A formulation of the helically symmetric resistive MHD equations that partially separates the ideal MHD characteristics is developed. Mode saturation can occur due to the quasilinear flattening of the pressure profile in the vicinity of the mode rational surface. However, this saturation process is defeated when the plasma overheats and in regions of the plasma where the shear is low. Finite fluid compression has significant, and optimistic, consequences on the long-term nonlinear behavior of this mode. For a tearing mode stable cylindrical spheromak equilibrium configuration with an axial beta value of 6%, complete overlap of the m = 1 islands occurs in about 3% of the resistive skin time for a magnetic Reynold's number of S = 10/sup 5/. For typical parameters of the S-1 device at Princeton, this time corresponds to nearly one-millisecond.

  14. Age dependent modes of extensional necking instability in soft glassy materials

    E-Print Network [OSTI]

    D. M. Hoyle; S. M. Fielding

    2015-01-07T23:59:59.000Z

    We study the instability to necking of an initially cylindrical filament of soft glassy material subject to extensional stretching. By numerical simulation of the soft glassy rheology model and a simplified fluidity model, and by analytical predictions within a highly generic toy description, we show that the mode of instability is set by the age of the sample relative to the inverse of the applied extensional strain rate. Young samples neck gradually via a liquid-like mode, the onset of which is determined by both the elastic loading and plastic relaxation terms in the stress constitutive equation. Older samples fail at smaller draw ratios via a more rapid mode, the onset of which is determined only by the solid-like elastic loading terms (though plastic effects arise later, once appreciable necking develops). We show this solid-like mode to be the counterpart, for elastoplastic materials, of the Consid\\`ere mode of necking in strain-rate-independent solids.

  15. The Fundamental Multi-Baseline Mode-Mixing Foreground in 21 cm EoR Observations

    E-Print Network [OSTI]

    Hazelton, Bryna J; Sullivan, Ian S

    2013-01-01T23:59:59.000Z

    The primary challenge for experiments measuring the neutral hydrogen power spectrum from the Epoch of Reionization (EoR) are mode-mixing effects where foregrounds from very bright astrophysical sources interact with the instrument to contaminate the EoR signal. In this paper we identify a new type of mode-mixing that occurs when measurements from non-identical baselines are combined for increased power spectrum sensitivity. This multi-baseline effect dominates the mode-mixing power and can contaminate the EoR window, an area in Fourier space previously identified to be relatively free of foreground power. Multi-baseline mode-mixing introduces characteristic shapes into the three dimensional Fourier space that are determined by the instrumental configuration and we develop an iterative approach to identifying and removing mode-mixed power based on these instrumental shapes.

  16. Zero-mode clad waveguides for performing spectroscopy with confined effective observation volumes

    DOE Patents [OSTI]

    Levene, Michael J.; Korlach, Jonas; Turner, Stephen W.; Craighead, Harold G.; Webb, Watt W.

    2005-07-12T23:59:59.000Z

    The present invention is directed to a method and an apparatus for analysis of an analyte. The method involves providing a zero-mode waveguide which includes a cladding surrounding a core where the cladding is configured to preclude propagation of electromagnetic energy of a frequency less than a cutoff frequency longitudinally through the core of the zero-mode waveguide. The analyte is positioned in the core of the zero-mode waveguide and is then subjected, in the core of the zero-mode waveguide, to activating electromagnetic radiation of a frequency less than the cut-off frequency under conditions effective to permit analysis of the analyte in an effective observation volume which is more compact than if the analysis were carried out in the absence of the zero-mode waveguide.

  17. A Preliminary Cost Study of the Dual Mode Inverter Controller

    SciTech Connect (OSTI)

    McKeever, J.W.

    2005-01-28T23:59:59.000Z

    In 1998, the Power Electronics and Electric Machinery Research Center (PEEMRC) at the Oak Ridge National Laboratory (ORNL) started a program to investigate alternate field weakening schemes for permanent magnet (PM) motors. The adjective ''alternate'' was used because at that time, outside research emphasis was on motors with interior-mounted PMs (IPMs). The PEEMRC emphasis was placed on motors with surface-mounted PMs (SPMs) because of the relative ease of manufacturing SPM motors compared with the IPM motors. Today the PEEMRC is continuing research on SPMs while examining the IPMs that have been developed by industry. Out of this task--the goal of which was to find ways to drive PM motors that inherently have low inductance at high speeds where their back-emf exceeds the supply voltage--ORNL developed and demonstrated the dual mode inverter control (DMIC) [1,2] method of field weakening for SPM motors. The predecessor of DMIC is conventional phase advance (CPA), which was developed by UQM Technologies, Inc. [3]. Fig. 1 shows the three sets of anti-parallel thyristors in the dashed box that comprise the DMIC. If one removes the dashed box by shorting each set of anti-parallel thyristors, the configuration becomes a conventional full bridge inverter on the left driving a three phase motor on the right. CPA may be used to drive this configuration ORNL's initial analyses of CPA and DMIC were based on driving motors with trapezoidal back-emfs [4-6], obtained using double layer lapped stator windings with one slot per pole per phase. A PM motor with a sinusoidal back-emf obtained with two poles per slot per phase has been analyzed under DMIC operation as a University of Tennessee-Knoxville (UTK) doctoral dissertation [7]. In the process of this research, ORNL has completed an analysis that explains and quantifies the role of inductance in these methods of control. The Appendix includes information on the equations for the three components of phase inductance, L{sub gap}, L{sub slot}, and L{sub endturns}. PM motors inherently have a lower inductance because of the increase in effective air gap caused by the magnet, which is in the denominator of the equation for L{sub gap}. L{sub gap} accounts for about half of the phase inductance. Because of the low inductance, there is a propensity for currents to exceed the motor's rated value. DMIC solves this problem for low-inductance PM motors and, in addition, provides a number of safety features that protect against uncontrolled generator mode operation [8,9]; however, the DMIC topology adds a pair of anti-parallel thyristors in each of the three phases, thereby introducing additional silicon costs as well as additional voltage drops during operation. It poses the tradeoff question; under what conditions can the beneficial features of DMIC offset its additional silicon cost and voltage drop losses? The purpose of this report is to address the tradeoff question. Sections of the report will: (1) review the role of self-inductance in performance and control of PM motors, (2) discuss the bounding inductances for motors with trapezoidal back-emfs under CPA control, (3) discuss the bounding inductances for trapezoidal back-emfs under DMIC, (4) discuss the bounding inductances for the PM synchronous motor (PMSM), (5) present the analysis showing how DMIC minimizes current in PMSMs, (6) present the results of a cost study conducted for two motors driven using a CPA inverter and for two motors driven using DMIC, (7) discuss estimating life cycle cost benefits, and (8) present conclusions.

  18. Energy and frequency dependence of the alpha particle redistribution produced by internal kink modes

    SciTech Connect (OSTI)

    Farengo, R. [Comisión Nacional de Energía Atómica, Centro Atómico Bariloche e Instituto Balseiro, 8400 Bariloche, RN (Argentina); Ferrari, H. E. [Comisión Nacional de Energía Atómica, Centro Atómico Bariloche e Instituto Balseiro, 8400 Bariloche, RN (Argentina); CONICET, 8400 Bariloche, RN (Argentina); Garcia-Martinez, P. L. [CONICET, 8400 Bariloche, RN (Argentina); Firpo, M.-C.; Ettoumi, W. [Laboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, 91128, Palaiseau cedex (France); Lifschitz, A. F. [Laboratoire d'Optique Appliquee, ENSTA, CNRS, Ecole Polytechnique, 91761 Palaiseau cedex (France)

    2014-08-15T23:59:59.000Z

    The redistribution of alpha particles due to internal kink modes is studied. The exact particle trajectories in the total fields, equilibrium plus perturbation, are calculated. The equilibrium has circular cross section and the plasma parameters are similar to those expected in ITER. The alpha particles are initially distributed according to a slowing down distribution function and have energies between 18?keV and 3.5?MeV. The (1, 1), (2, 2), and (2, 1) modes are included and the effect of changing their amplitude and frequency is studied. When only the (1, 1) mode is included, the spreading of high energy (E?1?MeV) alpha particles increases slowly with the energy and mode frequency. At lower energies, the redistribution is more sensitive to the mode frequency and particle energy. When a (2, 1) mode is added, the spreading increases significantly and particles can reach the edge of the plasma. Trapped particles are the most affected and the redistribution parameter can have maxima above 1?MeV, depending on the mode frequency. These results can have important implications for ash removal.

  19. Resistive wall tearing mode generated finite net electromagnetic torque in a static plasma

    SciTech Connect (OSTI)

    Hao, G. Z., E-mail: haogz@swip.ac.cn; Wang, A. K.; Xu, M.; Qu, H. P.; Peng, X. D.; Wang, Z. H.; Xu, J. Q.; Qiu, X. M. [Southwestern Institute of Physics, Post Office Box 432, Chengdu 610041 (China)] [Southwestern Institute of Physics, Post Office Box 432, Chengdu 610041 (China); Liu, Y. Q. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)] [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)

    2014-01-15T23:59:59.000Z

    The MARS-F code [Y. Q. Liu et al., Phys. Plasmas 7, 3681 (2000)] is applied to numerically investigate the effect of the plasma pressure on the tearing mode stability as well as the tearing mode-induced electromagnetic torque, in the presence of a resistive wall. The tearing mode with a complex eigenvalue, resulted from the favorable averaged curvature effect [A. H. Glasser et al., Phys. Fluids 18, 875 (1975)], leads to a re-distribution of the electromagnetic torque with multiple peaking in the immediate vicinity of the resistive layer. The multiple peaking is often caused by the sound wave resonances. In the presence of a resistive wall surrounding the plasma, a rotating tearing mode can generate a finite net electromagnetic torque acting on the static plasma column. Meanwhile, an equal but opposite torque is generated in the resistive wall, thus conserving the total momentum of the whole plasma-wall system. The direction of the net torque on the plasma is always opposite to the real frequency of the mode, agreeing with the analytic result by Pustovitov [Nucl. Fusion 47, 1583 (2007)]. When the wall time is close to the oscillating time of the tearing mode, the finite net torque reaches its maximum. Without wall or with an ideal wall, no net torque on the static plasma is generated by the tearing mode. However, re-distribution of the torque density in the resistive layer still occurs.

  20. Performance Assessment of Single Electrode-Supported Solid Oxide Cells Operating in the Steam Electrolysis Mode

    SciTech Connect (OSTI)

    X. Zhang; J. E. O'Brien; R. C. O'Brien; N. Petigny

    2011-11-01T23:59:59.000Z

    An experimental study is under way to assess the performance of electrode-supported solid-oxide cells operating in the steam electrolysis mode for hydrogen production. Results presented in this paper were obtained from single cells, with an active area of 16 cm{sup 2} per cell. The electrolysis cells are electrode-supported, with yttria-stabilized zirconia (YSZ) electrolytes ({approx}10 {mu}m thick), nickel-YSZ steam/hydrogen electrodes ({approx}1400 {mu}m thick), and modified LSM or LSCF air-side electrodes ({approx}90 {mu}m thick). The purpose of the present study is to document and compare the performance and degradation rates of these cells in the fuel cell mode and in the electrolysis mode under various operating conditions. Initial performance was documented through a series of voltage-current (VI) sweeps and AC impedance spectroscopy measurements. Degradation was determined through long-term testing, first in the fuel cell mode, then in the electrolysis mode. Results generally indicate accelerated degradation rates in the electrolysis mode compared to the fuel cell mode, possibly due to electrode delamination. The paper also includes details of an improved single-cell test apparatus developed specifically for these experiments.

  1. 190-fs passively mode-locked thulium fiber laser with a low threshold

    SciTech Connect (OSTI)

    Sharp, R.C.; Spock, D.E.; Pan, N.; Elliot, J. [Raytheon Company, Electronic Systems, 131 Spring Street, Lexington, Massachusetts 02173 (United States)

    1996-06-01T23:59:59.000Z

    We report a self-starting passively mode-locked thulium-doped silica fiber laser capable of 190-fs pulses. This practical, compact package is driven by a single 50-mW passively cooled diode laser, has a launched pump-power threshold of 18 mW for mode locking, and produces a 50-MHz train of mode-locked 20-pJ pulses at a wavelength near 1.9 {mu}m. {copyright} {ital 1996 Optical Society of America.}

  2. Techniques for reducing and/or eliminating secondary modes in a dye laser oscillator

    DOE Patents [OSTI]

    Hackel, Richard P. (Livermore, CA)

    1988-01-01T23:59:59.000Z

    A dye laser master oscillator is disclosed herein. This oscillator is intended to provide a single mode output, that is, a primary beam of light of a specific wavelength, but also has the tendency to provide secondary modes, that is, secondary beams of light at different wavelengths and slightly off-axis with respect to the primary beam as a result of grazing incident reflections within the dye cell forming part of the master oscillator. Also disclosed herein are a number of different techniques for reducing or eliminating these secondary modes.

  3. Large energy soliton erbium-doped fiber laser with a graphene-polymer composite mode locker

    E-Print Network [OSTI]

    Han Zhang; Qiaoliang Bao; Dingyuan Tang; Luming Zhao; Kianping Loh

    2009-09-30T23:59:59.000Z

    Due to its unique electronic property and the Pauli Blocking Principle, atomic layer graphene possesses wavelength-independent ultrafast saturable absorption, which can be exploited for the ultrafast photonics application. Through chemical functionalization, a graphene-polymer nanocomposite membrane was fabricated and firstly used to mode lock a fiber laser. Stable mode locked solitons with 3 nJ pulse energy, 700 fs pulse width at the 1590 nm wavelength have been directly generated from the laser. We show that graphene-polymer nanocomposites could be an attractive saturable absorber for high power fiber laser mode locking.

  4. Detecting the Amplitude Mode of Strongly Interacting Lattice Bosons by Bragg Scattering

    SciTech Connect (OSTI)

    Bissbort, Ulf; Hofstetter, Walter [Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, 60438 Frankfurt/Main (Germany); Goetze, Soeren; Heinze, Jannes; Krauser, Jasper S.; Weinberg, Malte; Becker, Christoph; Sengstock, Klaus [Institut fuer Laser-Physik, Universitaet Hamburg, 22761 Hamburg (Germany); Li Yongqiang [Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, 60438 Frankfurt/Main (Germany); Department of Physics, National University of Defense Technology, Changsha 410073 (China)

    2011-05-20T23:59:59.000Z

    We report the first detection of the Higgs-type amplitude mode using Bragg spectroscopy in a strongly interacting condensate of ultracold atoms in an optical lattice. By the comparison of our experimental data with a spatially resolved, time-dependent bosonic Gutzwiller calculation, we obtain good quantitative agreement. This allows for a clear identification of the amplitude mode, showing that it can be detected with full momentum resolution by going beyond the linear response regime. A systematic shift of the sound and amplitude modes' resonance frequencies due to the finite Bragg beam intensity is observed.

  5. Mode analysis of photonic crystal L3 cavities in self-suspended lithium niobate membranes

    SciTech Connect (OSTI)

    Diziain, Séverine, E-mail: severine.diziain@uni-jena.de; Geiss, Reinhard; Zilk, Matthias; Schrempel, Frank; Kley, Ernst-Bernhard; Pertsch, Thomas [Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena (Germany)] [Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena (Germany); Tünnermann, Andreas [Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena (Germany) [Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena (Germany); Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Str. 7, 07745 Jena (Germany)

    2013-12-16T23:59:59.000Z

    We report on a multimodal analysis of photonic crystal L3 cavities milled in lithium niobate free-standing membranes. The classical L3 cavity geometry is compared to an L3 cavity containing a second lattice superimposed on the primary one. Those two different geometries are investigated in terms of vertical radiation and quality (Q) factor for each mode of the cavities. Depending on the cavity geometry, some modes undergo an enhancement of their vertical radiation into small angles while other modes experience a higher Q factor. Experimental characterizations are corroborated by three-dimensional finite difference time domain simulations.

  6. Compensation for large tensor modes with iso-curvature perturbations in CMB anisotropies

    E-Print Network [OSTI]

    Masahiro Kawasaki; Shuichiro Yokoyama

    2014-04-23T23:59:59.000Z

    Recently, BICEP2 has reported the large tensor-to-scalar ratio $r=0.2^{+0.07}_{-0.05}$ from the observation of the cosmic microwave background (CMB) B-mode at degree-scales. Since tensor modes induce not only CMB B-mode but also the temperature fluctuations on large scales, to realize the consistent temperature fluctuations with the Planck result we should consider suppression of scalar perturbations on corresponding large scales. To realize such a suppression, we consider anti-correlated iso-curvature perturbations which could be realized in the simple curvaton model.

  7. Compensation for large tensor modes with iso-curvature perturbations in CMB anisotropies

    E-Print Network [OSTI]

    Kawasaki, Masahiro

    2014-01-01T23:59:59.000Z

    Recently, BICEP2 has reported the large tensor-to-scalar ratio $r=0.2^{+0.07}_{-0.05}$ from the observation of the cosmic microwave background (CMB) B-mode at degree-scales. Since tensor modes induce not only CMB B-mode but also the temperature fluctuations on large scales, to realize the consistent temperature fluctuations with the Planck result we should consider suppression of scalar perturbations on corresponding large scales. To realize such a suppression, we consider anti-correlated iso-curvature perturbations which could be realized in the simple curvaton model.

  8. A practical, compact, high performance two-mode fiber acousto-optic frequency shifter

    E-Print Network [OSTI]

    Siemsen, Patrick James

    1993-01-01T23:59:59.000Z

    the summation of the true second order modes to yield the LPi, modes. The resulting electric field components are given by LPcvee, E llz s~dp cos($)) r c a (2. 8) z ? '( ? 'I ? ') s&n((t), r & a Ki(W) (2. 9) LPeven, E 1 1y (2. 10) (2. 11) LIyodd . E dg... to the splitting of the propagation constants, the LP;i'" mode cuts olf at a 12 I- Z I- 0) Z 0 O Z 0 I- 0 Q. 0 K n. ?oo~ C ? 3 ECCENTRICITY Fig. 5. Separation of the propagation constants for an elliptical-core fiber. longer wavelength than does...

  9. A two-port polarization-insensitive coupler module between single-mode fiber and silicon-wire waveguide

    E-Print Network [OSTI]

    Shiraishi, Kazuo; Yoda, Hidehiko; Tsai, Chen S

    2012-01-01T23:59:59.000Z

    and C. Tsai, “A two-port single- mode fiber– silicon wireA two-port polarization-insensitive coupler module betweenAbstract: A two-port polarization-insensitive single-mode

  10. Modeling of Mode Transition Behavior in Argon Microhollow Cathode Discharges

    E-Print Network [OSTI]

    Raja, Laxminarayan L.

    conversion to molecular ions and three-body quenching of excited states become important resulting pressure causes a large fraction of the input power to be dissipated into gas heating. The gas thermal

  11. Evolution of Plasma Parameters in the Termination Phase of High Confinement H-modes at JET and Implications for ITER

    E-Print Network [OSTI]

    Evolution of Plasma Parameters in the Termination Phase of High Confinement H-modes at JET and Implications for ITER

  12. Direct Measurements of Damping Rates and Stability Limits for Low Frequency MHD Modes and Alfvén Eigenmodes in the JET Tokamak

    E-Print Network [OSTI]

    Direct Measurements of Damping Rates and Stability Limits for Low Frequency MHD Modes and Alfvén Eigenmodes in the JET Tokamak

  13. Dual Feedback Controlled High Performance Ar Seeded ELMy H-mode Discharges in JET including Trace Tritium Experiments

    E-Print Network [OSTI]

    Dual Feedback Controlled High Performance Ar Seeded ELMy H-mode Discharges in JET including Trace Tritium Experiments

  14. High-Performance Integrated Dual-Gate AlGaN/GaN Enhancement-Mode Transistor

    E-Print Network [OSTI]

    Lu, Bin

    In this letter, we present a new AlGaN/GaN enhancement-mode (E-mode) transistor based on a dual-gate structure. The dual gate allows the transistor to combine an E-mode behavior with low on-resistance and very high breakdown ...

  15. Intensities of the Raman-active modes in single and multiwall nanotubes S. Reich and C. Thomsen

    E-Print Network [OSTI]

    Nabben, Reinhard

    of recent experiments on aligned nanotubes we calculate the relative intensities for the high-energy modes of the nanotubes and on the excitation energy. As was shown by Milnera et al.3 the radial breathing modeIntensities of the Raman-active modes in single and multiwall nanotubes S. Reich and C. Thomsen

  16. 22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 1 Kinetic theory of Geodesic Acoustic

    E-Print Network [OSTI]

    Zonca, Fulvio

    22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 1 Kinetic theory of Geodesic Acoustic Zonca, Liu Chen and Zhiyong Qiu #12;22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 2 Chen and Zhiyong Qiu #12;22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 3 2 Linear

  17. Mode-I fracture in a nonlinear lattice with viscoelastic forces Shay I. Heizler and David A. Kessler

    E-Print Network [OSTI]

    Levine, Herbert

    Mode-I fracture in a nonlinear lattice with viscoelastic forces Shay I. Heizler and David A July 2002 We study mode-I fracture in a viscoelastic lattice model with a nonlinear force law force laws in mode-III fracture. At small driving, there is a strong dependency of the velocity curve

  18. Method of adiabatic modes in studying problems of smoothly irregular open waveguide structures

    SciTech Connect (OSTI)

    Sevastianov, L. A., E-mail: sevast@sci.pfu.edu.ru [Peoples' Friendship University of Russia (Russian Federation); Egorov, A. A. [Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)] [Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation); Sevastyanov, A. L. [Peoples' Friendship University of Russia (Russian Federation)] [Peoples' Friendship University of Russia (Russian Federation)

    2013-02-15T23:59:59.000Z

    Basic steps in developing an original method of adiabatic modes that makes it possible to solve the direct and inverse problems of simulating and designing three-dimensional multilayered smoothly irregular open waveguide structures are described. A new element in the method is that an approximate solution of Maxwell's equations is made to obey 'inclined' boundary conditions at the interfaces between themedia being considered. These boundary conditions take into account the obliqueness of planes tangent to nonplanar boundaries between the media and lead to new equations for coupled vector quasiwaveguide hybrid adiabatic modes. Solutions of these equations describe the phenomenon of 'entanglement' of two linear polarizations of an irregular multilayered waveguide, the appearance of a new mode in an entangled state, and the effect of rotation of the polarization plane of quasiwaveguide modes. The efficiency of the method is demonstrated by considering the example of numerically simulating a thin-film generalized waveguide Lueneburg lens.

  19. A Pulsational Model for the Orthogonal Polarization Modes in Radio Pulsars

    E-Print Network [OSTI]

    J. Christopher Clemens; R. Rosen

    2008-02-17T23:59:59.000Z

    In an earlier paper, we introduced a model for pulsars in which non-radial oscillations of high spherical degree (\\el) aligned to the magnetic axis of a spinning neutron star were able to reproduce subpulses like those observed in single-pulse measurements of pulsar intensity. The model did not address polarization, which is an integral part of pulsar emission. Observations show that many pulsars emit radio waves that appear to be the superposition of two linearly polarized emission modes with orthogonal polarization angles. In this paper, we extend our model to incorporate linear polarization. As before, we propose that pulsational displacements of stellar material modulate the pulsar emission, but now we apply this modulation to a linearly-polarized mode of emission, as might be produced by curvature radiation. We further introduce a second polarization mode, orthogonal to the first, that is modulated by pulsational velocities. We combine these modes in superposition to model the observed Stokes parameters in radio pulsars.

  20. High repetition rate mode-locked erbium-doped fiber lasers with complete electric field control

    E-Print Network [OSTI]

    Sickler, Jason William, 1978-

    2008-01-01T23:59:59.000Z

    Recent advances in fully-stabilized mode-locked laser systems are enabling many applications, including optical arbitrary waveform generation (OAWG). In this thesis work, we describe the development of high repetition-rate ...

  1. Safe Schedulability of Bounded-Rate Multi-Mode Systems Rajeev Alur

    E-Print Network [OSTI]

    Alur, Rajeev

    . INTRODUCTION There is a growing trend towards multi-mode composi- tional design frameworks [10, 15, 11-conditioning (HVAC) installations in a building so as to keep the temperature surrounding each installation

  2. Low-power current-mode ADC for CMOS sensor IC

    E-Print Network [OSTI]

    Agarwal, Anuj

    2005-11-01T23:59:59.000Z

    A low-energy current-mode algorithmic pipelined ADC targeted for use in distributed sensor networks is presented. The individual nodes combine sensing, computation and communications into an extremely small volume. The nodes operate with very low...

  3. DUAL MODE SCRAMJET: A COMPUTATIONAL INVESTIGATION ON COMBUSTOR DESIGN AND OPERATION.

    E-Print Network [OSTI]

    Milligan, Ryan Timothy

    2009-01-01T23:59:59.000Z

    ??Numerical analysis was performed on a Dual-Mode Scramjet isolator-combustor. Preliminary analysis was performed to form a baseline geometry. Another study validated the results of a… (more)

  4. Aligning modes of organization with technology: Critical transactions in the reform of infrastructures

    E-Print Network [OSTI]

    Boyer, Edmond

    1 Aligning modes of organization with technology: Critical transactions in the reform of their reform. Since infrastructures are characterized by strong technical complementarities, we explore the alignment between organization and technology and should be taken explicitly into account when reforming

  5. Design and Evaluation of a 42-V Automotive Alternator With Integrated Switched-Mode Rectifier

    E-Print Network [OSTI]

    Tang, Sai Chun

    This paper presents techniques for the design of high-power Lundell alternators with integrated switched-mode rectifiers. A multisection stator winding and interleaved rectifier arrangement is introduced that enables high ...

  6. Arrays of 128x32 InP-based Geiger-mode avalanche photodiodes

    E-Print Network [OSTI]

    Brattain, Michael A.

    Arrays of InP-based avalanche photodiodes operating at 1.06-µm wavelength in the Geiger mode have been fabricated in the 128x32 format. The arrays have been hermetically packaged with precision-aligned lenslet arrays, ...

  7. Bures distance as a measure of entanglement for two-mode squeezed thermal states

    SciTech Connect (OSTI)

    Marian, Paulina [Institute for Theoretical Atomic, Molecular and Optical Physics, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138 (United States); Department of Chemistry, University of Bucharest, Boulevard Regina Elisabeta 4-12, R-030018 Bucharest (Romania); Marian, Tudor A. [Institute for Theoretical Atomic, Molecular and Optical Physics, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138 (United States); Department of Physics, University of Bucharest, P.O. Box MG-11, R-077125 Bucharest-Magurele (Romania); Scutaru, Horia [Center for Advanced Studies in Physics of the Romanian Academy, Calea 13 Septembrie 13, R-050711 Bucharest (Romania)

    2003-12-01T23:59:59.000Z

    We propose a reliable entanglement measure for a two-mode squeezed thermal state of the quantum electromagnetic field in terms of its Bures distance to the set of all separable states of the same kind. The requisite fidelity of a pair of two-mode squeezed thermal states is exactly evaluated. By applying the Peres-Simon criterion of separability, we find the closest separable state. This enables us to establish an insightful expression of the amount of entanglement. We also derive the relative entropy of a two-mode squeezed thermal state with respect to another one. This quantity is exploited in the pure-state case by undertaking a similar approximation for the entropic entanglement of a two-mode squeezed vacuum state. Comparison with previous work lends support to our approach that replaces the reference set of all separable Gaussian states by its subset consisting only of the squeezed thermal ones.

  8. On the Use of Material-Dependent Damping in ANSYS for Mode Superposition Transient Analysis

    SciTech Connect (OSTI)

    Nie, J.; Wei, X.

    2011-07-17T23:59:59.000Z

    The mode superposition method is often used for dynamic analysis of complex structures, such as the seismic Category I structures in nuclear power plants, in place of the less efficient full method, which uses the full system matrices for calculation of the transient responses. In such applications, specification of material-dependent damping is usually desirable because complex structures can consist of multiple types of materials that may have different energy dissipation capabilities. A recent review of the ANSYS manual for several releases found that the use of material-dependent damping is not clearly explained for performing a mode superposition transient dynamic analysis. This paper includes several mode superposition transient dynamic analyses using different ways to specify damping in ANSYS, in order to determine how material-dependent damping can be specified conveniently in a mode superposition transient dynamic analysis.

  9. Hybridization process for back-illuminated silicon Geiger-mode avalanche photodiode arrays

    E-Print Network [OSTI]

    Schuette, Daniel R.

    We present a unique hybridization process that permits high-performance back-illuminated silicon Geiger-mode avalanche photodiodes (GM-APDs) to be bonded to custom CMOS readout integrated circuits (ROICs) - a hybridization ...

  10. Annular mode-like responses to external forcings in a simple atmospheric general circulation model

    E-Print Network [OSTI]

    Ring, Michael J., 1979-

    2008-01-01T23:59:59.000Z

    In this thesis, I investigate the response of a simple atmospheric general circulation model to applied forcings to learn whether the annular mode patterns are a preferred model response to the forcings. The thesis is ...

  11. Multi-mode Energy Management for Multi-tier Server Tibor Horvath

    E-Print Network [OSTI]

    Skadron, Kevin

    Multi-mode Energy Management for Multi-tier Server Clusters Tibor Horvath tibor Charlottesville, VA 22904 ABSTRACT This paper presents an energy management policy for recon- figurable clusters General Terms Algorithms, Design, Experimentation, Management, Perfor- mance Keywords energy management

  12. Freight mode choice : air transport versus ocean transport in the 1990's

    E-Print Network [OSTI]

    Lewis, Dale B.

    1994-01-01T23:59:59.000Z

    Value density is often considered when considering the choice whether to ship cargo by air or by water. However, although cargo value is directly linked to the overall cost of shipment, it is the deciding factor in mode ...

  13. E-Print Network 3.0 - abnormal default-mode network Sample Search...

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

    Sample search results for: abnormal default-mode network Page: << < 1 2 3 4 5 > >> 1 Cognitive fluctuations, a core feature of Dementia with Lewy Bodies, recently have Summary: of...

  14. Multi-mode two-dimensional infrared spectroscopy of peptides and proteins

    E-Print Network [OSTI]

    DeFlores, Lauren P

    2008-01-01T23:59:59.000Z

    In this thesis, a methodology for understanding structural stability of proteins through multi-mode two-dimensional infrared (2D IR) spectroscopy is developed. The experimental framework for generation of broadband infrared ...

  15. A comparative study of imtermediate P-mode pressure-wave propagation in the sun

    E-Print Network [OSTI]

    Brown, Terry T

    1996-01-01T23:59:59.000Z

    By analyzing the observed frequencies of solar P-mode pressure waves, it has been possible to obtain detailed knowledge about the density, rate of rotation, temperature, pressure and composition of the sun in its interior. The frequencies...

  16. High-resolution infrared measurements on HSOH: Analysis of the OH fundamental vibrational mode

    E-Print Network [OSTI]

    Giesen, Thomas

    -wave spectroscopy on HSOH and H34 SOH [1]. The authors used flash vacuum pyrolysis of di-tert-butyl sulfoxide] identified five of six fundamental vibrational modes of matrix isolated HSOH formed by pyrolysis of di

  17. E-Print Network 3.0 - acoustic modes excited Sample Search Results

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

    Collection: Engineering 12 49th APS-DPP Radial structures and nonlinear excitation of Geodesic Acoustic Modes 1 Radial structures and nonlinear Summary: 49th APS-DPP Radial...

  18. E-Print Network 3.0 - all-hadronic decay mode Sample Search Results

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

    is also considered. 1. Introduction The dominant decay mode of the Standard Model Higgs boson is H b... % of these events contain four hadronic jets (the all-hadron' channel),...

  19. Failure modes in high-power lithium-ion batteries for use in hybrid electric vehicles

    E-Print Network [OSTI]

    2001-01-01T23:59:59.000Z

    MODES IN HIGH-POWER LITHIUM-ION BATTERIES FOR USE IN HYBRIDof high-power lithium-ion batteries for hybrid electricthe development of lithium-ion batteries for hybrid electric

  20. CIMEL SUN PHOTOMETERS: UPDATES ON NEW DEPLOYMENTS AND CLOUD MODE ZENITH RADIANCE DATA

    E-Print Network [OSTI]

    CIMEL SUN PHOTOMETERS: UPDATES ON NEW DEPLOYMENTS AND CLOUD MODE ZENITH RADIANCE DATA Richard of Science ABSTRACT Since March 1998, ARM has deployed Cimel Sun PHOTometers (CSPHOT) at several but not all

  1. Line asymmetry of solar p-modes: Properties of acoustic sources

    E-Print Network [OSTI]

    Pawan Kumar; Sarbani Basu

    1999-02-19T23:59:59.000Z

    The observed solar p-mode velocity power spectra are compared with theoretically calculated power spectra over a range of mode degree and frequency. The shape of the theoretical power spectra depends on the depth of acoustic sources responsible for the excitation of p-modes, and also on the multipole nature of the source. We vary the source depth to obtain the best fit to the observed spectra. We find that quadrupole acoustic sources provide a good fit to the observed spectra provided that the sources are located between 700 km and 1050 km below the top of the convection zone. The dipole sources give a good fit for significantly shallower source, with a source-depth of between 120 km and 350 km. The main uncertainty in the determination of depth arises due to poor knowledge of nature of power leakages from modes with adjacent degrees, and the background in the observed spectra.

  2. Complex modes and new amplification regimes in periodic multi transmission lines interacting with an electron beam

    E-Print Network [OSTI]

    Othman, Mohamed; Capolino, Filippo

    2014-01-01T23:59:59.000Z

    We show the existence of a new regime of operation for travelling wave tubes (TWTs) composed of slow-wave periodic structures that support two or more electromagnetic modes, with at least two synchronized with an electron beam. The interaction between the slow-wave structure and an electron beam is quantified using a multi transmission line approach (MTL) and transfer matrix analysis leading to the identification of modes with complex Bloch wavenumber. In particular, we report a new operation condition for TWTs based on an electron beam synchronous to two modes exhibiting a degeneracy condition near a band edge in a MTL slow-wave periodic structure. We show a phenomenological change in the band structure of periodic TWT where we observe at least two growing modal cooperating solutions as opposed to a uniform MTL interacting with an electron beam where there is strictly only one growing mode solution.

  3. A three-dimensional coupled modes solution for range-dependent waveguides

    E-Print Network [OSTI]

    Luo, Wenyu

    2005-01-01T23:59:59.000Z

    Despite the great achievements obtained with fast-field and parabolic equation models, normal mode programs still remain a very efficient, simple and practical tool for describing ocean acoustics in range-independent ...

  4. Evidence for the Charmless Annihilation Decay Mode B[subscript s][superscript 0]??[superscript +]?[superscript -

    E-Print Network [OSTI]

    Gomez-Ceballos, Guillelmo

    We search for annihilation decay modes of neutral b mesons into pairs of charmless charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 6??fb[superscript -1] ...

  5. Isotope effect in normal-to-local transition of acetylene bending modes

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

    Ma, Jianyi [University of New Mexico, Albuquerque, NM, (United States); Xu, Dingguo [University of New Mexico, Albuquerque, NM, (United States) and Sichuan Univ. (China); Guo, Hua [University of New Mexico, Albuquerque, NM, (United States); Tyng, Vivian [Univ. of Oregon, Eugene, OR (United States); Kellman, Michael E. [Univ. of Oregon, Eugene, OR (United States)

    2012-01-03T23:59:59.000Z

    The normal-to-local transition for the bending modes of acetylene is considered a prelude to its isomerization to vinylidene. Here, such a transition in fully deuterated acetylene is investigated using a full-dimensional quantum model. It is found that the local benders emerge at much lower energies and bending quantum numbers than in the hydrogen isotopomer HCCH. This is accompanied by a transition to a second kind of bending mode called counter-rotator, again at lower energies and quantum numbers than in HCCH. These transitions are also investigated using bifurcation analysis of two empirical spectroscopic fitting Hamiltonians for pure bending modes, which helps to understand the origin of the transitions semiclassically as branchings or bifurcations out of the trans and normal bend modes when the latter become dynamically unstable. The results of the quantum model and the empirical bifurcation analysis are in very good agreement.

  6. Hyperparametric effects in a whispering-gallery mode rutile dielectric resonator at liquid helium temperatures

    E-Print Network [OSTI]

    Nitin R. Nand; Maxim Goryachev; Jean-Michel Le Floch; Daniel L. Creedon; Michael E. Tobar

    2014-10-31T23:59:59.000Z

    We report the first observation of low power drive level sensitivity, hyperparametric amplification, and single-mode hyperparametric oscillations in a dielectric rutile whispering-gallery mode resonator at 4.2 K. The latter gives rise to a comb of sidebands at 19.756 GHz. Whereas, most frequency combs in the literature have been observed in optical systems using an ensemble of equally spaced modes in microresonators or fibers, the present work represents generation of a frequency comb using only a single-mode. The experimental observations are explained by an additional 1/2 degree-of-freedom originating from an intrinsic material nonlinearity at optical frequencies, which affects the microwave properties due to the extremely low loss of rutile. Using a model based on lumped circuits, we demonstrate that the resonance between the photonic and material 1/2 degree-of-freedom, is responsible for the hyperparametric energy transfer in the system.

  7. Parametric Instability in Long Optical Cavities and Suppression by Dynamic Transverse Mode Frequency Modulation

    E-Print Network [OSTI]

    Zhao, Chunnong; Fang, Qi; Blair, Carl; Qin, Jiayi; Blair, David; Degallaix, Jerome; Yamamoto, Hiroaki

    2015-01-01T23:59:59.000Z

    Three mode parametric instability has been predicted in Advanced gravitational wave detectors. Here we present the first observation of this phenomenon in a large scale suspended optical cavity designed to be comparable to those of advanced gravitational wave detectors. Our results show that previous modelling assumptions that transverse optical modes are stable in frequency except for frequency drifts on a thermal deformation time scale is unlikely to be valid for suspended mass optical cavities. We demonstrate that mirror figure errors cause a dependence of transverse mode offset frequency on spot position. Combined with low frequency residual motion of suspended mirrors, this leads to transverse mode frequency modulation which suppresses the effective parametric gain. We show that this gain suppression mechanism can be enhanced by laser spot dithering or fast thermal modulation. Using Advanced LIGO test mass data and thermal modelling we show that gain suppression factors of 10-20 could be achieved for ind...

  8. Dynamics of long flexible cylinders at high-mode number in uniform and sheared flows

    E-Print Network [OSTI]

    Swithenbank, Susan B. (Susan Brenda)

    2007-01-01T23:59:59.000Z

    The primary objective of this thesis is to characterize the response of risers at high-mode numbers in sheared and uniform ocean currents. As part of this thesis work, three separate experiments have been planned and ...

  9. Corrosion mechanisms in aqueous solutions containing dissolved H2S. Part 2: Mode! ofthe cathodic reactions.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Corrosion mechanisms in aqueous solutions containing dissolved H2S. Part 2: Mode! ofthe cathodicFP Energies nouvelles, Rond-point de 1'échangeur de Solaize BP3, 69360 Solaize, France. J. Corrosion

  10. The slow-mode nature of compressible wave power in solar wind turbulence

    E-Print Network [OSTI]

    Howes, G G; Klein, K G; Chen, C H K; Salem, C S; TenBarge, J M

    2011-01-01T23:59:59.000Z

    We use a large, statistical set of measurements from the Wind spacecraft at 1 AU, and supporting synthetic spacecraft data based on kinetic plasma theory, to show that the compressible component of inertial range solar wind turbulence is primarily in the kinetic slow mode. The zero-lag cross correlation C(delta n, delta B_parallel) between proton density fluctuations delta n and the field-aligned (compressible) component of the magnetic field delta B_parallel is negative and close to -1. The typical dependence of C(delta n,delta B_parallel) on the ion plasma beta_i is consistent with a spectrum of compressible wave energy that is almost entirely in the kinetic slow mode. This has important implications for both the nature of the density fluctuation spectrum and for the cascade of kinetic turbulence to short wavelengths, favoring evolution to the kinetic Alfven wave mode rather than the (fast) whistler mode.

  11. Modeling preferences for innovative modes and services : a case study in Lisbon

    E-Print Network [OSTI]

    Yang, Lang, S.M. Massachusetts Institute of Technology

    2010-01-01T23:59:59.000Z

    Increases in car ownership and usage have resulted in serious traffic congestion problems in many large cities worldwide. Innovative travel modes and services can play an important role in improving the efficiency and ...

  12. Silicon-germanium saturable absorbers and erbium-doped waveguides for integrated mode-locked lasers

    E-Print Network [OSTI]

    Byun, Hyunil

    2006-01-01T23:59:59.000Z

    In this thesis, Silicon-Germanium (SiGe) Saturable Bragg Reflectors (SBR) and Erbium-doped waveguide chips are fabricated and characterized as crucial components for integration of a mode-locked laser on a Si-chip. The ...

  13. Physica D 140 (2000) 227243 The structure of mode-locked regions in quasi-periodically

    E-Print Network [OSTI]

    Pikovsky, Arkady

    ) into the devil's staircase of rotation numbers obtained in a number of real systems: the plateaus of the staircase correspond to parameter values in the mode-locked tongues (see e.g. [2]). Recently, there has been

  14. Rate Effects for Mixed-Mode Fracture of Plastically Deforming, Adhesively-Bonded Structures

    E-Print Network [OSTI]

    Thouless, Michael

    from a commercial adhesive and a dual-phase steel has been studied under different rates. Since mixed- mode fracture occurs along the interface between the steel and adhesive, the cohesive- parameters

  15. SYNTACTIC AND COMPOSITE FOAMS Whispering gallery mode-based micro-optical sensors

    E-Print Network [OSTI]

    �tügen, Volkan

    SYNTACTIC AND COMPOSITE FOAMS Whispering gallery mode-based micro-optical sensors for structural and filament wound pipes has been studied, where one of the glass fibers is replaced by an optical fiber

  16. Feedback stabilization of resistive shell modes in a reversed field pinch

    SciTech Connect (OSTI)

    Fitzpatrick, R.; Yu, E.P. [Institute for Fusion Studies, Department of Physics, University of Texas at Austin, Austin, Texas 78712-1060 (United States)] [Institute for Fusion Studies, Department of Physics, University of Texas at Austin, Austin, Texas 78712-1060 (United States)

    1999-09-01T23:59:59.000Z

    A reactor relevant reversed field pinch (RFP) must be capable of operating successfully when surrounded by a close-fitting resistive shell whose L/R time is much {ital shorter} than the pulse length. Resonant modes are largely unaffected by the shell resistivity, provided that the plasma rotation is maintained against the breaking effect of nonaxisymmetric eddy currents induced in the shell. This may require an auxiliary momentum source, such as a neutral beam injector. Nonresonant modes are largely unaffected by plasma rotation, and are expected to manifest themselves as nonrotating {ital resistive shell modes} growing on the L/R time of the shell. A general RFP equilibrium is subject to many simultaneously unstable resistive shell modes; the only viable control mechanism for such modes in a RFP reactor is {ital active feedback}. It is demonstrated than an {ital N}-fold toroidally symmetric arrangement of feedback coils, combined with a strictly linear feedback algorithm, is capable of {ital simultaneously stabilizing} all intrinsically unstable resistive shell modes over a wide range of different RFP equilibria. The number of coils in the toroidal direction {ital N}, at any given poloidal angle, must be greater than, or equal to, the range of toroidal mode numbers of the unstable resistive shell modes. However, this range is largely determined by the aspect-ratio of the device. The optimum coil configuration corresponds to one in which each feedback coil slightly overlaps its immediate neighbors in the toroidal direction. The critical current which must be driven around each feedback coils is, at most, a few percent of the equilibrium toroidal plasma current. The feedback scheme is robust to small deviations from pure {ital N}-fold toroidal symmetry or a pure linear response of the feedback circuits. {copyright} {ital 1999 American Institute of Physics.}

  17. Three-dimensional whispering gallery modes in InGaAs nanoneedle lasers on silicon

    SciTech Connect (OSTI)

    Tran, T.-T. D.; Chen, R.; Ng, K. W.; Ko, W. S.; Lu, F.; Chang-Hasnain, C. J., E-mail: cch@berkeley.edu [Applied Science and Technology Group and Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720 (United States)

    2014-09-15T23:59:59.000Z

    As-grown InGaAs nanoneedle lasers, synthesized at complementary metal–oxide–semiconductor compatible temperatures on polycrystalline and crystalline silicon substrates, were studied in photoluminescence experiments. Radiation patterns of three-dimensional whispering gallery modes were observed upon optically pumping the needles above the lasing threshold. Using the radiation patterns as well as finite-difference-time-domain simulations and polarization measurements, all modal numbers of the three-dimensional whispering gallery modes could be identified.

  18. Neoclassical effects on the stabilization of tearing mode by current modulation

    SciTech Connect (OSTI)

    Yang, Xiaoqing, E-mail: inkyang@mail.ustc.edu.cn; Wang, Shaojie; Yang, Weihong [Department of Modern Physics, University of Science and Technology of China, Hefei, 230026 (China)] [Department of Modern Physics, University of Science and Technology of China, Hefei, 230026 (China)

    2014-02-15T23:59:59.000Z

    The neoclassical effects on the stabilization of tearing modes by current modulation have been investigated. Neoclassical effects enhance the resistivity and reduce the resistive diffusion time of the modulation current. Therefore, the oscillating current can penetrate deeper into the plasma. With an oscillating loop voltage, the plasma oscillates radially at the Ware-pinch velocity. These neoclassical effects improve the efficiency of tearing mode stabilization by the current modulation.

  19. Reactive-coupling-induced normal mode splittings in microdisk resonators coupled to waveguides

    SciTech Connect (OSTI)

    Huang Sumei; Agarwal, G. S. [Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)

    2010-05-15T23:59:59.000Z

    We study the optomechanical design introduced by M. Li et al. [Phys. Rev. Lett. 103, 223901 (2009)], which is very effective for investigation of the effects of reactive coupling. We show the normal mode splitting that is due solely to reactive coupling rather than due to dispersive coupling. We suggest feeding the waveguide with a pump field along with a probe field and scanning the output probe for evidence of reactive-coupling-induced normal mode splitting.

  20. Micromagnetic study of auto-oscillation modes in spin-Hall nano-oscillators

    SciTech Connect (OSTI)

    Ulrichs, H., E-mail: henning.ulrichs@uni-muenster.de; Demidov, V. E.; Demokritov, S. O. [Department of Physics and Center for Nonlinear Science, University of Münster, Corrensstraße 2-4, 48149 Münster (Germany)

    2014-01-27T23:59:59.000Z

    We present a numerical study of magnetization dynamics in a recently introduced spin torque nano-oscillator, whose operational principle relies on the spin-Hall effect—spin-Hall nano-oscillators. Our numerical results show good agreement with the experimentally observed behaviors and provide detailed information about the features of the primary auto-oscillation mode observed in the experiments. They also clarify the physical nature of the secondary auto-oscillation mode, which was experimentally observed under certain conditions only.