National Library of Energy BETA

Sample records for two-photon channel shows

  1. Search for the Standard Model Higgs boson in the two photon decay channel with the ATLAS detector at the LHC

    E-Print Network [OSTI]

    Taylor, Frank E.

    A search for the Standard Model Higgs boson in the two photon decay channel is reported, using 1.08 fb?11.08 fb[superscript ?1] of proton–proton collision data at a centre-of-mass energy of 7 TeV recorded by the ATLAS ...

  2. A Search For the Higgs Boson in CMS in the Two Photon Decay Channel

    E-Print Network [OSTI]

    Christopher Palmer

    2011-09-30

    We report on a search for SM Higgs Boson in the two photon decay mode conducted by the CMS experiment with the data accumulated during the 2010 & 2011 running of the LHC at center of mass collision energy of 7 TeV.

  3. Two-Photon Emission from Semiconductors

    E-Print Network [OSTI]

    Alex Hayat; Pavel Ginzburg; Meir Orenstein

    2007-10-25

    We report the first experimental observations of two-photon emission from semiconductors, to the best of our knowledge, and develop a corresponding theory for the room-temperature process. Spontaneous two-photon emission is demonstrated in optically-pumped bulk GaAs and in electrically-driven GaInP/AlGaInP quantum wells. Singly-stimulated two-photon emission measurements demonstrate the theoretically predicted two-photon optical gain in semiconductors - a necessary ingredient for any realizations of future two-photon semiconductor lasers. Photon-coincidence experiment validates the simultaneity of the electrically-driven GaInP/AlGaInP two-photon emission, limited only by detector's temporal resolution.

  4. Light Dark Matter Annihilations into Two Photons

    E-Print Network [OSTI]

    C. Boehm; J. Orloff; P. Salati

    2006-07-19

    We compute the pair annihilation cross section of light (spin-0) dark matter particles into two photons and discuss the detectability of the monochromatic line associated with these annihilations.

  5. A Measurement of the Recently Discovered Higgs Boson in the Decay into Two Photons with Associated Jets, Using

    E-Print Network [OSTI]

    Sheldon, Nathan D.

    A Measurement of the Recently Discovered Higgs Boson in the Decay into Two Photons with Associated or not this is the Higgs boson as predicted by the Standard Model of Particle Physics (SM). Experimentally measuring of the Higgs boson via its decay into two photons, which was one of the key discovery channels. Part

  6. Effect of morphology and solvent on two-photon absorption of nano zinc oxide

    SciTech Connect (OSTI)

    Kavitha, M.K. [Department of Chemistry, Indian Institute of Space Science and Technology, Valiamala, Thiruvananthapuram 695547, Kerala (India); Haripadmam, P.C.; Gopinath, Pramod; Krishnan, Bindu [Department of Physics, Indian Institute of Space Science and Technology, Valiamala, Thiruvananthapuram 695547, Kerala (India); John, Honey, E-mail: honey@iist.ac.in [Department of Chemistry, Indian Institute of Space Science and Technology, Valiamala, Thiruvananthapuram 695547, Kerala (India)

    2013-05-15

    Highlights: ? ZnO nanospheres and triangular structures synthesis by novel precipitation technique. ? The effect of precursor concentration on the size and shape of nano ZnO. ? Open aperture Z-scan measurements of the ZnO nanoparticle dispersions. ? Nanospheres exhibit higher two photon absorption coefficient than triangular nanostructures. ? Nanospheres dispersed in water exhibit higher two photon absorption coefficient than its dispersion in 2-propanol. - Abstract: In this paper, we report the effect of morphology and solvent on the two-photon absorption of nano zinc oxide. Zinc oxide nanoparticles in two different morphologies like nanospheres and triangular nanostructures are synthesized by novel precipitation technique and their two-photon absorption coefficient is measured using open aperture Z-scan technique. Experimental results show that the zinc oxide nanospheres exhibit higher two-photon absorption coefficient than the zinc oxide triangular nanostructures. The zinc oxide nanospheres dispersed in water exhibit higher two-photon absorption coefficient than that of its dispersion in 2-propanol. The zinc oxide nanospheres dispersed in water shows a decrease in two-photon absorption coefficient with an increase in on-axis irradiance. The result confirms the dependence of shape and solvent on the two-photon absorption of nano zinc oxide.

  7. Quantum correlation of path-entangled two-photon states in waveguide arrays with defects

    SciTech Connect (OSTI)

    Dou, Yiling; Xu, Lei; Han, Bin; Bo, Fang; Xu, Jingjun; Zhang, Guoquan, E-mail: zhanggq@nankai.edu.cn [The MOE Key Laboratory of Weak Light Nonlinear Photonics, School of Physics and TEDA Applied Physics Institute, Nankai University, Tianjin 300457 (China)] [The MOE Key Laboratory of Weak Light Nonlinear Photonics, School of Physics and TEDA Applied Physics Institute, Nankai University, Tianjin 300457 (China)

    2014-04-15

    We study the quantum correlation of path-entangled states of two photons in coupled one-dimensional waveguide arrays with lattice defects. Both off-diagonal and diagonal defects are considered, which show different effects on the quantum correlation of path-entangled two-photon states. Two-photon bunching or anti-bunching effects can be observed and controlled. The two photons are found to have a tendency to bunch at the side lobes with a repulsive off-diagonal defect, and the path-entanglement of the input two-photon state can be preserved during the propagation. We also found that defect modes may play an important role on the two-photon correlation of path-entangled states in the waveguide arrays. Due to the quantum interference effect, intriguing evolution dynamics of the two-photon correlation matrix elements with oscillation frequencies being either twice of or the same as that of a classical light wave, depending on the position of the correlation matrix element, is observed. Our results show that it is possible to manipulate the two-photon correlation properties of path-entangled states in waveguide arrays with lattice defects.

  8. Two-photon spectroscopy of excitons with entangled photons

    SciTech Connect (OSTI)

    Schlawin, Frank, E-mail: Frank.Schlawin@physik.uni-freiburg.de [Department of Chemistry, University of California, Irvine, California 92697-2025 (United States) [Department of Chemistry, University of California, Irvine, California 92697-2025 (United States); Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79108 Freiburg (Germany); Mukamel, Shaul, E-mail: smukamel@uci.edu [Department of Chemistry, University of California, Irvine, California 92697-2025 (United States)] [Department of Chemistry, University of California, Irvine, California 92697-2025 (United States)

    2013-12-28

    The utility of quantum light as a spectroscopic tool is demonstrated for frequency-dispersed pump-probe, integrated pump-probe, and two-photon fluorescence signals which show Ramsey fringes. Simulations of the frequency-dispersed transmission of a broadband pulse of entangled photons interacting with a three-level model of matter reveal how the non-classical time-bandwidth properties of entangled photons can be used to disentangle congested spectra, and reveal otherwise unresolved features. Quantum light effects are most pronounced at weak intensities when entangled photon pairs are well separated, and are gradually diminished at higher intensities when different photon pairs overlap.

  9. Hyperspectral imaging of microalgae using two-photon excitation.

    SciTech Connect (OSTI)

    Sinclair, Michael B.; Melgaard, David Kennett; Reichardt, Thomas A.; Timlin, Jerilyn Ann; Garcia, Omar Fidel; Luk, Ting Shan; Jones, Howland D. T.; Collins, Aaron M.

    2010-10-01

    A considerable amount research is being conducted on microalgae, since microalgae are becoming a promising source of renewable energy. Most of this research is centered on lipid production in microalgae because microalgae produce triacylglycerol which is ideal for biodiesel fuels. Although we are interested in research to increase lipid production in algae, we are also interested in research to sustain healthy algal cultures in large scale biomass production farms or facilities. The early detection of fluctuations in algal health, productivity, and invasive predators must be developed to ensure that algae are an efficient and cost-effective source of biofuel. Therefore we are developing technologies to monitor the health of algae using spectroscopic measurements in the field. To do this, we have proposed to spectroscopically monitor large algal cultivations using LIDAR (Light Detection And Ranging) remote sensing technology. Before we can deploy this type of technology, we must first characterize the spectral bio-signatures that are related to algal health. Recently, we have adapted our confocal hyperspectral imaging microscope at Sandia to have two-photon excitation capabilities using a chameleon tunable laser. We are using this microscope to understand the spectroscopic signatures necessary to characterize microalgae at the cellular level prior to using these signatures to classify the health of bulk samples, with the eventual goal of using of LIDAR to monitor large scale ponds and raceways. By imaging algal cultures using a tunable laser to excite at several different wavelengths we will be able to select the optimal excitation/emission wavelengths needed to characterize algal cultures. To analyze the hyperspectral images generated from this two-photon microscope, we are using Multivariate Curve Resolution (MCR) algorithms to extract the spectral signatures and their associated relative intensities from the data. For this presentation, I will show our two-photon hyperspectral imaging results on a variety of microalgae species and show how these results can be used to characterize algal ponds and raceways.

  10. THE JOURNAL OF CHEMICAL PHYSICS 139, 244110 (2013) Two-photon spectroscopy of excitons with entangled photons

    E-Print Network [OSTI]

    Mukamel, Shaul

    2013-01-01

    THE JOURNAL OF CHEMICAL PHYSICS 139, 244110 (2013) Two-photon spectroscopy of excitons with entangled photons Frank Schlawin1,2,a) and Shaul Mukamel1,b) 1 Department of Chemistry, University for frequency-dispersed pump- probe, integrated pump-probe, and two-photon fluorescence signals which show

  11. Two-photon spectroscopy of excitons with entangled photons

    E-Print Network [OSTI]

    Schlawin, F; Schlawin, F; Mukamel, S

    2013-01-01

    probe experiment with entangled photons. The two beams arethe light state changes from twin photons to squeezed light.139, 244110 (2013) Two-photon spectroscopy of excitons with

  12. Resonance production in two-photon interactions

    SciTech Connect (OSTI)

    Roe, N.A.

    1989-02-01

    Resonance production in two-photon interactions is studied using data collected with the ASP detector at the PEP e/sup +/e/sup /minus// storage ring located at the Stanford Linear Accelerator Center. The ASP detector is a non-magnetic lead-glass calorimeter constructed from 632 lead-glass bars. It covers 94% of 4..pi.. in solid angle, extending to within 20/degree/ of the beamline. Lead-scintillator calorimeters extend the coverage to within 21 mr of the beamline on both sides. Energy resolution of ..sqrt..E/10%, where E is the energy is GeV, is achieved for electrons and photons in the lead-glass calorimeter, and particle trajectories are reconstructed with high efficiency. A total luminosity of 108 pb/sup /minus/1/ was collected with the ASP detector at a center-of-mass energy of 29 GeV. The observed process is e/sup +/e/sup /minus// ..-->.. e/sup +/e/sup /minus//..gamma..*..gamma..* ..-->.. e/sup +/e/sup /minus//X, is a pseudoscalar resonance (J/sup PC/ = 0/sup /minus/+/) and ..gamma..* is a virtual (mass /ne/ 0) photon. The outgoing electrons scatter down the beampipe and are not detected. The observed resonances are the /eta/ and /eta/' mesons, with masses of 549 and 958 MeV, respectively. They are detected in the ..gamma gamma.. decay mode; a total of 2380 +- 49 /eta/ ..-->.. ..gamma gamma.. and 568 +- 26 /eta/' ..-->.. ..gamma gamma.. events are observed. From the number of events, the detection efficiency, and the calculated production cross sections the radiative widths, GAMMA/sub ..gamma gamma../, of the /eta/ and /eta/' were measured and found to be: GAMMA/sub ..gamma gamma../(/eta/) = .481 +- .010 +- .047keV and GAMMA/sub ..gamma gamma../(/eta/') = 4.71 +- .22 +- .70keV. These results are in good agreement with the world average values. 67 refs., 42 figs., 20 tabs.

  13. Two-photon bound state in self-focusing media

    SciTech Connect (OSTI)

    Chiao, R.Y.; Deutsch, I.H. ); Garrison, J.C. )

    1991-09-09

    We derive a two-photon bound-state solution to the problem of quantum propagation of light in Kerr-effect nonlinear media which classically would exhibit self-focusing and self-trapping. We propose an experiment to see this two-photon bound state.

  14. Characterization of single photons using two-photon interference

    E-Print Network [OSTI]

    T. Legero; T. Wilk; A. Kuhn; G. Rempe

    2005-12-02

    Adiabatic passage techniques allow the generation of single photons which are very long compared to the typical detector time resolution. Therefore the detection time of a photon can be measured within the duration of the single-photon wavepacket. As a consequence, two-photon interference can be investigated in a time-resolved manner, i.e., the coincidence rate can be measured as a function of the time between photodetections. The theoretical analysis shows that this method not only gives information about the duration of single photons, but also about their coherence time. Here we discuss how to use this method for a spectral or temporal characterization of a single-photon source.

  15. The role of pump coherence in two-photon interferometry

    E-Print Network [OSTI]

    J. Liang; S. M. Hendrickson; T. B. Pittman

    2010-12-20

    We use a parametric down-conversion source pumped by a short coherence-length continuous-wave (CW) diode laser to perform two-photon interferometry in an intermediate regime between the more familiar Franson-type experiments with a long coherence-length pump laser, and the short pulsed pump "time-bin" experiments pioneered by Gisin's group. The use of a time-bin-like Mach-Zehnder interferometer in the CW pumping beam induces coherence between certain two-photon amplitudes, while the CW nature of the experiment prevents the elimination of remaining incoherent ones. The experimental results highlight the role of pump coherence in two-photon interferometry.

  16. Exact Analysis of the Response of Quantum Systems to Two Photons Using a QSDE Approach

    E-Print Network [OSTI]

    Yu Pan; Daoyi Dong; Guofeng Zhang

    2015-09-23

    We introduce the quantum differential stochastic equation (QSDE) approach to exactly analyze of the response of quantum systems to a continuous-mode two-photon input. The QSDE description of the two-photon process allows us to integrate the input-output analysis with the quantum network theory, and so the analytical computability of the output state of a general quantum system can be addressed within this framework. We show that the time-domain two-photon output states can be exactly calculated for a large class of quantum systems including passive linear networks, optomechanical oscillators and two-level emitter in waveguide systems. In particular, we propose to utilize the results for the exact simulation of the stimulated emission as well as the study of the scattering of two-mode photon wave packets.

  17. Axial range of conjugate adaptive optics in two-photon microscopy

    E-Print Network [OSTI]

    Paudel, Hari P; Mertz, Jerome; Bifano, Thomas

    2015-01-01

    We describe an adaptive optics technique for two-photon microscopy in which the deformable mirror used for aberration compensation is positioned in a plane conjugate to the plane of the aberration. We demonstrate in a proof-of-principle experiment that this technique yields a large field of view advantage in comparison to standard pupil-conjugate adaptive optics. Further, we show that the extended field of view in conjugate AO is maintained over a relatively large axial translation of the deformable mirror with respect to the conjugate plane. We conclude with a discussion of limitations and prospects for the conjugate AO technique in two-photon biological microscopy.

  18. Two-photon pumped lead halide perovskite nanowire lasers

    E-Print Network [OSTI]

    Gu, Zhiyuan; Sun, Wenzhao; Li, Jinakai; Liu, Shuai; Song, Qinghai; Xiao, Shumin

    2015-01-01

    Solution-processed lead halide perovskites have shown very bright future in both solar cells and microlasers. Very recently, the nonlinearity of perovskites started to attract considerable research attention. Second harmonic generation and two-photon absorption have been successfully demonstrated. However, the nonlinearity based perovskite devices such as micro- & nano- lasers are still absent. Here we demonstrate the two-photon pumped nanolasers from perovskite nanowires. The CH3NH3PbBr3 perovskite nanowires were synthesized with one-step solution self-assembly method and dispersed on glass substrate. Under the optical excitation at 800 nm, two-photon pumped lasing actions with periodic peaks have been successfully observed at around 546 nm. The obtained quality (Q) factors of two-photon pumped nanolasers are around 960, and the corresponding thresholds are about 674?J=cm2. Both the Q factors and thresholds are comparable to conventional whispering gallery modes in two-dimensional polygon microplates. Ou...

  19. Two photon couplings of the lightest isoscalars from BELLE data

    SciTech Connect (OSTI)

    Dai, Lingyun [JLAB; Pennington, Michael R. [JLAB

    2014-09-01

    Amplitude Analysis of two photon production of ?? and K?K, using S-matrix constraints and fitting all available data, including the latest precision results from Belle, yields a single partial wave solution up to 1.4 GeV. The two photon couplings of the ?/f0(500), f0(980) and f2(1270) are determined from the residues of the resonance poles.

  20. Two photon couplings of the lightest isoscalars from BELLE data

    SciTech Connect (OSTI)

    Dai, Ling -Yun; Pennington, Michael R.

    2014-07-07

    Amplitude Analysis of two photon production of ?? and K¯K, using S-matrix constraints and fitting all available data, including the latest precision results from Belle, yields a single partial wave solution up to 1.4 GeV. The two photon couplings of the ?/f0(500), f0(980) and f2(1270) are determined from the residues of the resonance poles.

  1. Two photon couplings of the lightest isoscalars from BELLE data

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

    Dai, Ling -Yun; Pennington, Michael R.

    2014-07-07

    Amplitude Analysis of two photon production of ?? and K¯K, using S-matrix constraints and fitting all available data, including the latest precision results from Belle, yields a single partial wave solution up to 1.4 GeV. The two photon couplings of the ?/f0(500), f0(980) and f2(1270) are determined from the residues of the resonance poles.

  2. Two?photon dissociation of vibrationally excited HD+: The inhomogeneous differential equation approach

    E-Print Network [OSTI]

    Chu, Shih-I; Laughlin, Cecil; Datta, Krishna K.

    1986-01-01

    g (v i ? j i )?? 1s? g (v,?j=j i ±1) ??2p? u (k,?j ? f =j±1) dominates the two?photon process in most of the cases we have studied. Further, the results show that ?(2) L increases rather rapidly as the initial vibrational quantum number v i increases...

  3. Method for universal detection of two-photon polarization entanglement

    E-Print Network [OSTI]

    Karol Bartkiewicz; Pawe? Horodecki; Karel Lemr; Adam Miranowicz; Karol ?yczkowski

    2015-04-10

    Detecting and quantifying quantum entanglement of a given unknown state poses problems that are fundamentally important for quantum information processing. Surprisingly, no direct (i.e., without quantum tomography) universal experimental implementation of a necessary and sufficient test of entanglement has been designed even for a general two-qubit state. Here we propose an experimental method for detecting a collective universal witness, which is a necessary and sufficient test of two-photon polarization entanglement. It allows us to detect entanglement for any two-qubit mixed state and to establish tight upper and lower bounds on its amount. A different element of this method is the sequential character of its main components, which allows us to obtain relatively complicated information about quantum correlations with the help of simple linear-optical elements. As such, this proposal realizes a universal two-qubit entanglement test within the present state of the art of quantum optics. We show the optimality of our setup with respect to the minimal number of measured quantities.

  4. Neutral Meson Decays into Two Photons from Lattice QCD

    E-Print Network [OSTI]

    Huey-Wen Lin; Saul D. Cohen

    2013-02-04

    A precision determination of the neutral-pion width would improve determinations of the splitting between the up- and down-quark masses, and matrix elements for the decay of neutral mesons into two photons could play a role in the attempt to probe beyond-the-Standard Model physics in muon $g-2$ experiments. The theoretical error is dominated by hadronic light-by-light diagrams, and since direct measurements are extremely difficult, model calculations factorize it into two-photon diagrams connected by the lightest hadrons. We employ perturbative techniques to express the photon as a superposition of QCD eigenstates accessible in lattice-QCD calculations and found that vector-meson dominance is a poor description of the two-photon decay process when both photons are off shell.

  5. Search for Anomalous Production of Events with Two Photons and Additional Energetic Objects at CDF

    SciTech Connect (OSTI)

    Aaltonen, T.; /Helsinki Inst. of Phys.; Adelman, J.; /Chicago U., EFI; Alvarez Gonzalez, B.; /Oviedo U. /Cantabria Inst. of Phys.; Amerio, S.; /Padua U. /INFN, Padua; Amidei, D.; /Michigan U.; Anastassov, A.; /Northwestern U.; Annovi, A.; /Frascati; Antos, J.; /Comenius U. /Kosice, IEF; Apollinari, G.; /Fermilab; Apresyan, A.; /Purdue U.; Arisawa, T.; /Waseda U. /Dubna, JINR

    2009-10-01

    The authors present results of a search for anomalous production of two photons together with an electron, muon, {tau} lepton, missing transverse energy, or jets using p{bar p} collision data from 1.1-2.0 fb{sup -1} of integrated luminosity collected by the Collider Detector at Fermilab (CDF). The event yields and kinematic distributions are examined for signs for new physics without favoring a specific model of new physics. The results are consistent with the standard model expectations. The search employs several new analysis techniques that significantly reduce instrumental backgrounds in channels with an electron and missing transverse energy.

  6. Two photon amplitude of partially coherent partially entangled electromagnetic fields

    E-Print Network [OSTI]

    Miguel Angel Olvera; Sonja Franke-Arnold

    2015-07-30

    The development of efficient protocols for pure and mixed states preparation is challenging task. Most of the theory of quantum information applications has been developed for fully coherent or completely incoherent light. However, in many situations of interest partially coherent light has been proved to be a more robust model of radiation. In this paper the underpinning theory of two photon amplitude functions for down-converted fields with partially coherent pump beams is investigated. By using the generalised Siegert relations and the coherent mode representation of the cross spectral density matrix the two photon amplitude is fully characterised for partially coherent beams. A number of correlation properties from modern coherence theory are demonstrated to be preserved under parametric down-conversion. Based on the generalised Siegert relations and the Cauchy-Schwarz inequality a measure of entanglement for the two photon amplitude is proposed. Upper bounds for this measure are found in terms of the \\emph{golden ratio} for maximally entangled states. Two inequalities are derived for the two photon amplitude for which there exist a transition zone from super-Poisson statistics to sub-Poisson statistics for down-converted partially coherent fields.

  7. submitted to CALICO 2007 (The Computer Assisted Language Instruction Consortium Meeting) Learning to Show You're Listening: A Back-Channel Trainer for Arabic

    E-Print Network [OSTI]

    Ward, Nigel

    a training sequence which enables the acquisition of basic Arabic back-channel skill, namely to Show You're Listening: A Back-Channel Trainer for Arabic Rafael Escalante, Nigel G. Ward, Yaffa Al Bayyari, Thamar Solorio 100 word abstract Good listeners generally produce back-channel feedback, and do

  8. Entanglement in a Jaynes-Cummings Model with Two Atoms and Two Photon Modes

    E-Print Network [OSTI]

    Samina S. Masood; Allen Miller

    2015-04-05

    We investigate the conditions of entanglement for a system of two atoms and two photon modes in vacuum, using the Jaynes-Cummings model in the rotating-wave approximation. It is found, by generalizing the existing results, that the strength of entanglement is a periodic function of time. We explicitly show that our results are in agreement with the existing results of entanglement conditions under appropriate limits. Results for the two-atom and two-photon system are generalized to the case of arbitrary values for the atomic energies, corresponding to photon modes frequencies. Though it is apparently a generalization of the existing work, we have considered for the first time both the resonant and nonresonant conditions and found a general equation which could be true for both cases. Moreover, we show that periodicity of the entanglement is a distinct feature of resonant system. Considering the two atoms and two photons system, in detail, we setup an approach which could be generalized for many particle systems and the resulting master equation can also be analyzed.

  9. Externally triggered coherent two-photon emission from hydrogen molecules

    E-Print Network [OSTI]

    Yuki Miyamoto; Hideaki Hara; Takahiko Masuda; Noboru Sasao; Minoru Tanaka; Satoshi Uetake; Akihiro Yoshimi; Koji Yoshimura; Motohiko Yoshimura

    2015-05-28

    We report coherent enhancement of two-photon emission from the excited vibrational state of molecular hydrogen triggered by irradiating mid-infrared pulses externally. We previously observed the two-photon emission triggered by the internally generated fourth Stokes photons. By injecting independent mid-infrared pulses externally, it is possible to control experimental parameters and investigate the mechanism in more detail. In this article, we describe the two-photon emission using the external trigger pulses. Its spectrum and dependence on the energy and timing of the trigger pulse are presented along with numerical simulations based on the Maxwell-Bloch equations. The measured number of emitted photons is 6 10^11 photons/pulse and the resulting enhancement factor from the spontaneous emission is more than 10^18. This value is three orders of magnitude higher than that of the previous experiment. External control of emission process is expected to be essential for observation of weaker process of radiative emission of neutrino pair.

  10. Externally triggered coherent two-photon emission from hydrogen molecules

    E-Print Network [OSTI]

    Miyamoto, Yuki; Masuda, Takahiko; Sasao, Noboru; Tanaka, Minoru; Uetake, Satoshi; Yoshimi, Akihiro; Yoshimura, Koji; Yoshimura, Motohiko

    2015-01-01

    We report coherent enhancement of two-photon emission from the excited vibrational state of molecular hydrogen triggered by irradiating mid-infrared pulses externally. We previously observed the two-photon emission triggered by the internally generated fourth Stokes photons. By injecting independent mid-infrared pulses externally, it is possible to control experimental parameters and investigate the mechanism in more detail. In this article, we describe the two-photon emission using the external trigger pulses. Its spectrum and dependence on the energy and timing of the trigger pulse are presented along with numerical simulations based on the Maxwell-Bloch equations. The measured number of emitted photons is 6 10^11 photons/pulse and the resulting enhancement factor from the spontaneous emission is more than 10^18. This value is three orders of magnitude higher than that of the previous experiment. External control of emission process is expected to be essential for observation of weaker process of radiative ...

  11. Two-photon exchange measurements with positrons and electrons

    E-Print Network [OSTI]

    John Arrington

    2009-05-05

    Two-photon exchange contributions have potentially broad ranging impact on several charged lepton scattering measurements. Previously believed to be extremely small, based in part on comparisons of positron scattering and electron scattering in the 1950s and 1960s, recent data suggest that the corrections may be larger than expected, in particular in kinematic regions that were inaccessible in these early positron scattering measurements. Additional measurements using positron beams at Jefferson Lab would allow for a detailed investigation of these contributions in a range of reactions and observables.

  12. Microphotonic parabolic light directors fabricated by two-photon lithography

    SciTech Connect (OSTI)

    Atwater, Jackson H; Spinelli, P.; Kosten, Emily D; Parsons, J.; Van Lare, C; Van de Groep, J; Garcia de Abajo, J.; Polman, Albert; Atwater, Harry A.

    2011-01-01

    We have fabricated microphotonic parabolic light directors using two-photon lithography, thin-film processing, and aperture formation by focused ion beam lithography. Optical transmission measurements through upright parabolic directors 22 ?m high and 10 ?m in diameter exhibit strong beam directivity with a beam divergence of 5.6°, in reasonable agreement with ray-tracing and full-field electromagnetic simulations. The results indicate the suitability of microphotonic parabolic light directors for producing collimated beams for applications in advanced solar cell and light-emitting diode designs.

  13. Two photon spectroscopy of UF6 in the near ultraviolet

    SciTech Connect (OSTI)

    Bernstein, E.R.; Kennedy, P.M.

    1981-03-01

    The two photon excited fluorescence excitation spectrum of UF6 was observed in the region 410 to 315 nm. The spectrum was virtually indistinguishable from the one photon absorption in this region. No vibronic structure was observed in absorption or dispersed emission. These data indicate a high density of u and g states for UF6 in this energy range and facile photochemical decomposition. Emission intensity was found to be proportional to laser power to the 3.0 to 3.6 power.

  14. Two-photon Photo-emission of Ultrathin Film PTCDA Morphologies on Ag(111)

    E-Print Network [OSTI]

    Yang, Aram

    2008-01-01

    Two-photon Photo-emission of Ultrathin Film PTCDAwith angle-resolved two-photon photo- emission. In Stranski-probe laser pulse, h? 2 , photo-emits the electron. research

  15. Preparation of polarization-entangled mixed states of two photons Chuanwei Zhang

    E-Print Network [OSTI]

    Texas at Austin. University of

    Preparation of polarization-entangled mixed states of two photons Chuanwei Zhang Department 30 August 2003; published 16 January 2004 We propose a scheme for preparing arbitrary two-photons arbitrary polarization-entangled mixed states of two photons via con- trolled decoherence. In the experiment

  16. Adiabatic two-photon quantum gate operations using a long-range photonic bus

    E-Print Network [OSTI]

    Anthony P. Hope; Thach G. Nguyen; Arnan Mitchell; Andrew D. Greentree

    2014-12-01

    Adiabatic techniques have much potential to realise practical and robust optical waveguide devices. Traditionally photonic elements are limited to coupling schemes that rely on proximity to nearest neighbour elements. We combine adiabatic passage with a continuum based long-range optical bus to break free from such topological restraints and thereby outline a new approach to photonic quantum gate design. We explicitly show designs for adiabatic quantum gates that produce a Hadamard, 50:50 and 1/3:2/3 beam splitter, and non-deterministic CNOT gate based on planar thin, shallow ridge waveguides. Our calculations are performed under conditions of one and two-photon inputs.

  17. Manipulation of a two-photon pump in superconductor - semiconductor heterostructures

    E-Print Network [OSTI]

    Paul Baireuther; Peter P. Orth; Ilya Vekhter; Jörg Schmalian

    2014-03-13

    We investigate the photon statistics, entanglement and squeezing of a pn-junction sandwiched between two superconducting leads, and show that such an electrically-driven photon pump generates correlated and entangled pairs of photons. In particular, we demonstrate that the squeezing of the fluctuations in the quadrature amplitudes of the emitted light can be manipulated by changing the relative phase of the order parameters of the superconductors. This reveals how macroscopic coherence of the superconducting state can be used to tailor the properties of a two-photon state.

  18. Restoring quantum enhancement in realistic two-photon interferometry using spatial information

    E-Print Network [OSTI]

    Micha? Jachura; Rados?aw Chrapkiewicz; Rafa? Demkowicz-Dobrza?ski; Wojciech Wasilewski; Konrad Banaszek

    2015-04-21

    Practical realizations of quantum-enhanced interferometry are vulnerable to imperfections such as the residual spectral distinguishability of interfering photons. We demonstrate experimentally that a careful design of the spatial structure of used photons, combined with position-resolved coincidence detection at the output, allows one to recover quantum enhancement for a two-photon Mach-Zehnder interferometer operated in a regime that otherwise cannot even attain the shot-noise limit. This shows the potential of engineering the modal structure of physical systems in metrological applications.

  19. Two-Photon Exchange Effect Studied with Neural Networks

    E-Print Network [OSTI]

    Krzysztof M. Graczyk

    2011-08-30

    An approach to the extraction of the two-photon exchange (TPE) correction from elastic $ep$ scattering data is presented. The cross section, polarization transfer (PT), and charge asymmetry data are considered. It is assumed that the TPE correction to the PT data is negligible. The form factors and TPE correcting term are given by one multidimensional function approximated by the feed forward neural network (NN). To find a model-independent approximation the Bayesian framework for the NNs is adapted. A large number of different parametrizations is considered. The most optimal model is indicated by the Bayesian algorithm. The obtained fit of the TPE correction behaves linearly in epsilon but it has a nontrivial Q2 dependence. A strong dependence of the TPE fit on the choice of parametrization is observed.

  20. Two-photon exchange effect studied with neural networks

    SciTech Connect (OSTI)

    Graczyk, Krzysztof M. [Institute of Theoretical Physics, University of Wroclaw, pl. M. Borna 9, PL-50-204 Wroclaw (Poland)

    2011-09-15

    An approach to the extraction of the two-photon exchange (TPE) correction from elastic ep scattering data is presented. The cross-section, polarization transfer (PT), and charge asymmetry data are considered. It is assumed that the TPE correction to the PT data is negligible. The form factors and TPE correcting term are given by one multidimensional function approximated by the feedforward neural network (NN). To find a model-independent approximation, the Bayesian framework for the NNs is adapted. A large number of different parametrizations is considered. The most optimal model is indicated by the Bayesian algorithm. The obtained fit of the TPE correction behaves linearly in {epsilon} but it has a nontrivial Q{sup 2} dependence. A strong dependence of the TPE fit on the choice of parametrization is observed.

  1. Two-Photon Exchange E#27;ffects in Elastic Electron-Proton Scattering

    SciTech Connect (OSTI)

    Johnson, Myriam James [Argonne National Laboratory

    2013-08-01

    Two methods, Rosenbluth separation and polarization transfer, can be used to extract the proton form factor ratio #22;mu_p G_Ep/G_Mp, but they do not yield the same results. It is thought that the disagreement is due to two photon exchange corrections to the #27;differential cross sections. High precision proton Rosenbluth extractions were carried out at 102 kinematics points spanning 16 values of momentum transfer Q^2, from 0.40 to 5.76 GeV^2. Reduced cross sections were found to 1.1% or better for Q^2 less than 3 GeV^2, increasing to 4% at 5.76 GeV^2. The form factor ratios were determined to 1:5-3% for Q2 < 1.5 GeV^2, increasing to 9% by 3 GeV^2 and rapidly above. Our data agrees with prior Rosenbluth, improving upon it the 1.0 - 2.0 GeV^2 range to conclusively show a separation from polarization transfer where it had not been certain before. In addition, reduced cross sections at each Q^2 were tested for nonlinearity in the angular variable. Such a departure from linearity would be a signature of two photon exchange effects, and prior data had not been #30;sufficiently precise to show nonzero curvature. Our data begins to hint at negative curvature but does not yet show a significant departure from zero.

  2. Two-photon photovoltaic effect in gallium arsenide Jeff Chiles,1

    E-Print Network [OSTI]

    Fathpour, Sasan

    Two-photon photovoltaic effect in gallium arsenide Jichi Ma,1 Jeff Chiles,1 Yagya D. Sharma,2 214669); published September 4, 2014 The two-photon photovoltaic effect is demonstrated in gallium; (230.0250) Optoelectronics; (040.5350) Photovoltaic; (130.4310) Nonlinear. http://dx.doi.org/10.1364/OL

  3. Partial angular coherence and the angular Schmidt spectrum of entangled two-photon fields

    SciTech Connect (OSTI)

    Jha, Anand Kumar; Boyd, Robert W. [Institute of Optics, University of Rochester, Rochester, New York 14627 (United States); Agarwal, Girish S. [Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)

    2011-12-15

    We study partially coherent fields that have a coherent-mode representation in the orbital-angular-momentum-mode basis. For such fields, we introduce the concepts of the angular coherence function and the coherence angle. Such fields are naturally produced by the process of parametric down-conversion--a second-order nonlinear optical process in which a pump photon breaks up into two entangled photons, known as the signal and idler photons. We show that the angular coherence functions of the signal and idler fields are directly related to the angular Schmidt (spiral) spectrum of the down-converted two-photon field and thus that the angular Schmidt spectrum can be measured directly by measuring the angular coherence function of either the signal or the idler field, without requiring coincidence detection.

  4. Bright and dark singlet excitons via linear and two-photon spectroscopy in monolayer transition metal dichalcogenides

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

    Berkelbach, Timothy C.; Hybertsen, Mark S.; Reichmann, David R.

    2015-08-10

    We discuss the linear and two-photon spectroscopic selection rules for spin-singlet excitons in monolayer transition-metal dichalcogenides. Our microscopic formalism combines a fully k-dependent few-orbital band structure with a many-body Bethe-Salpeter equation treatment of the electron-hole interaction, using a model dielectric function. We show analytically and numerically that the single-particle, valley-dependent selection rules are preserved in the presence of excitonic effects. Furthermore, we definitively demonstrate that the bright (one-photon allowed) excitons have s-type azimuthal symmetry and that dark p-type excitons can be probed via two-photon spectroscopy. Thus, the screened Coulomb interaction in these materials substantially deviates from the 1/??r form; thismore »breaks the “accidental” angular momentum degeneracy in the exciton spectrum, such that the 2p exciton has a lower energy than the 2s exciton by at least 50 meV. We compare our calculated two-photon absorption spectra to recent experimental measurements.« less

  5. The rest mass of a system of two photons in different inertial reference frames: 0+0=0 and 0+0>0

    E-Print Network [OSTI]

    Berhard Rothenstein; Doru P?unescu; ?tefan Popescu

    2007-08-31

    We show that the rest mass of a system consisting of two photons is a relativistic invariant having the same magnitude in all inertial reference frames in relative motion. A scenario which starts with two photons where theirs frequencies are equal to each other the magnitude of the rest mass of the system depends on the angle made by the momentums of the two photons. The behavior of the photons when detected from two inertial reference frames is illustrated using a relativistic diagram which displays in true values the physical quantities (scalar and vector) introduced in order to characterize the dynamical properties of the photon. We consider that the obtained results should be taken in the discussions, some time fierce, between those who ban the concept of relativistic mass and those who consider that its use is harmless.

  6. Development of high-speed two-photon microscopy for biological and medical applications

    E-Print Network [OSTI]

    Kim, Ki Hean

    2005-01-01

    Two-photon microscopy (TPM) is one of the most powerful microscopic technologies for in-vivo 3D tissue imaging up to a few hundred micrometers. It has been finding important applications in neuronal imaging, tumor physiology ...

  7. Ultrafast photodetection in an all-silicon chip enabled by two-photon absorption

    E-Print Network [OSTI]

    Bravo-Abad, Jorge

    In this letter we theoretically demonstrate that by dramatically enhancing two-photon absorption, all-silicon optical microresonators can act as efficient photodetectors for light at telecom wavelengths. We illustrate this ...

  8. Effects of (Multi)branching of Dipolar Chromophores on Photophysical Properties and Two-Photon Absorption

    E-Print Network [OSTI]

    Tretiak, Sergei

    the synthesis on knowledge- based materials. Among the many questions that are still debated, coherent coupling may be either enhanced or suppressed.44 Among the many NLO effects, two-photon absorption (TPA) has

  9. Two photon luminescence from quantum dots using broad and narrowband ultrafast laser pulses 

    E-Print Network [OSTI]

    Balasubramanian, Haribhaskar

    2008-10-10

    Nonlinear optical microscopy (NLOM) offers many advantages when imaging intact biological samples. By using ultrafast lasers in the near infrared and two photon excitation (TPE), signal production is limited to the focal volume and provides...

  10. Time?resolved two?photon induced anisotropy decay: The rotational diffusion regime

    E-Print Network [OSTI]

    Wan, Chaozhi; Johnson, Carey K.

    1994-09-01

    Two?photon excitation (TPE) of randomly oriented chromophores in solution generates an anisotropic distribution. In a previous paper [Chem. Phys. 179, 513 (1994)], the polarization dependence of the TPE signal probed by a secondary spectroscopic...

  11. Atom microscopy via two-photon spontaneous emission spectroscopy RID A-5077-2009 

    E-Print Network [OSTI]

    Qamar, Sajid; Evers, Joerg; Zubairy, M. Suhail

    2009-01-01

    We study subwavelength position measurement via spontaneous emission spectroscopy with two photons. Our model systems are a single Lambda-type three-level atom, in which a dual interaction generates two independent photons, and an M-type five...

  12. Time Delays in Two-Photon Ionization Jing Su, Hongcheng Ni, Agnieszka Jaro-Becker, and Andreas Becker

    E-Print Network [OSTI]

    Becker, Andreas

    Time Delays in Two-Photon Ionization Jing Su, Hongcheng Ni, Agnieszka Jaro-Becker, and Andreas results of ab initio numerical simulations of time delays in two-photon ionization of the helium atom contributions, namely, a time delay acquired during the absorption of the two photons from the extreme

  13. Two-photon Absorption Process in Semiconductor Quantum Dots

    E-Print Network [OSTI]

    Cipolatti, Rolci

    semicon- ductors, shows very low optical efficiency. For this reason the detection of this process becomes-like characteristics, in particular, the complete quantization of the energy levels. Such attributes present in QD's makes, indeed, quite a difference when compared with the physical behavior of isolated atoms or bulk

  14. Transmission area and two-photon correlated imaging

    E-Print Network [OSTI]

    Yanfeng Bai; Shensheng Han; Honglin Liu

    2006-11-03

    The relationship between transmission area of an object imaged and the visibility of its image is investigated in a lensless system. We show that the changes of the visibility are quite different when the transmission area is varied by different manners. An increase of the transmission by adding the slit number leads to a decrease of the visibility. While, the change is adverse when the slit width is widened for a given distance between two slits.

  15. Elucidation of Perovskite Film Micro-Orientations Using Two-Photon Total Internal Reflectance Fluorescence Microscopy

    SciTech Connect (OSTI)

    Watson, Brianna R; Yang, Bin; Xiao, Kai; Ma, Yingzhong; Doughty, Benjamin L; Calhoun, Tessa R

    2015-01-01

    The emergence of efficient hybrid organic-inorganic perovskite photovoltaic materials has caused the rapid development of a variety of preparation and processing techniques designed to maximize their performance. As processing methods continue to emerge, it is important to understand how the optical properties of these materials are affected on a microscopic scale. Here polarization resolved two-photon total internal reflectance microscopy (TIRFM) was used to probe changes in transition dipole moment orientation as a function of thermal annealing time in hybrid organic-inorganic lead iodide based perovskite (CH3NH3PbI3) thin films on glass. These results show that as thermal annealing time is increased the distribution of transition moments pointing out-of-plane decreases in favor of forming areas with increased in-plane orientations. It was also shown through the axial sensitivity of TIRFM that the surface topography is manifested in the signal intensity and can be used to survey aspects of morphology in coincidence with the optical properties of these films.

  16. Direct measurement of the biphoton Wigner function through two-photon interference

    E-Print Network [OSTI]

    Tom Douce; Andreas Eckstein; Stephen P. Walborn; Antonio Z. Khoury; Sara Ducci; Arne Keller; Thomas Coudreau; Pérola Milman

    2013-09-26

    The Hong-Ou-Mandel (HOM) experiment was a benchmark in quantum optics, evidencing the quantum nature of the photon. In order to go deeper, and obtain the complete information about the quantum state of a system, for instance, composed by photons, the direct measurement or reconstruction of the Wigner function or other quasi--probability distribution in phase space is necessary. In the present paper, we show that a simple modification in the well-known HOM experiment provides the direct measurement of the Wigner function. We apply our results to a widely used quantum optics system, consisting of the biphoton generated in the parametric down conversion process. In this approach, a negative value of the Wigner function is a sufficient condition for non-gaussian entanglement between two photons. In the general case, the Wigner function provides all the required information to infer entanglement using well known necessary and sufficient criteria. We analyze our results using two examples of parametric down conversion processes taken from recent experiments. The present work offers a new vision of the HOM experiment that further develops its possibilities to realize fundamental tests of quantum mechanics involving decoherence and entanglement using simple optical set-ups.

  17. Pseudopotential calculations and photothermal lensing measurements of two-photon absorption in solids

    SciTech Connect (OSTI)

    White, W.T. III

    1985-11-04

    We have studied two-photon absorption in solids theoretically and experimentally. We have shown that it is possible to use accurate band structure techniques to compute two-photon absorption spectra within 15% of measured values in a wide band-gap material, ZnS. The empirical pseudopotential technique that we used is significantly more accurate than previous models of two-photon absorption in zinc blende materials, including present tunneling theories (which are essentially parabolic-band results in disguise) and the nonparabolic-band formalism of Pidgeon et al. and Weiler. The agreement between our predictions and previous measurements allowed us to use ZnS as a reference material in order to validate a technique for measuring two-photon absorption that was previously untried in solids, pulsed dual-beam thermal lensing. With the validated technique, we examined nonlinear absorption in one other crystal (rutile) and in several glasses, including silicates, borosilicates, and one phosphate glass. Initially, we believed that the absorption edges of all the materials were comparable; however, subsequent evidence suggested that the effective band-gap energies of the glasses were above the energy of two photons in our measurement. Therefore, we attribute the nonlinear absorption that we observed in glasses to impurities or defects. The measured nonlinear absorption coefficients were of the order of a few cm/TW in the glasses and of the order of 10 cm/GW in the crystals, four orders of magnitude higher than in glasses. 292 refs.

  18. Enhanced-locality fiber-optic two-photon-fluorescence live-brain interrogation

    SciTech Connect (OSTI)

    Fedotov, I. V.; Doronina-Amitonova, L. V.; Sidorov-Biryukov, D. A.; Fedotov, A. B.; Anokhin, K. V.; Kilin, S. Ya.; Sakoda, K.; Zheltikov, A. M.

    2014-02-24

    Two-photon excitation is shown to substantially enhance the locality of fiber-based optical interrogation of strongly scattering biotissues. In our experiments, a high-numerical-aperture, large-core-are fiber probe is used to deliver the 200-fs output of a 100-MHz mode-locked ytterbium fiber laser to samples of live mouse brain, induce two-photon fluorescence of nitrogen–vacancy centers in diamond markers in brain sample. Fiber probes with a high numerical aperture and a large core area are shown to enable locality enhancement in fiber-laser–fiber-probe two-photon brain excitation and interrogation without sacrificing the efficiency of fluorescence response collection.

  19. Global analysis of proton elastic form factor data with two-photon exchange corrections

    SciTech Connect (OSTI)

    J. Arrington; W. Melnitchouk; J. A. Tjon

    2007-09-01

    We use the world's data on elastic electron-proton scattering and calculations of two-photon exchange effects to extract corrected values of the proton's electric and magnetic form factors over the full Q^2 range of the existing data. Our analysis combines the corrected Rosenbluth cross section and polarization transfer data, and is the first extraction of G_Ep and G_Mp including explicit two-photon exchange corrections and their associated uncertainties. In addition, we examine the angular dependence of the corrected cross sections, and discuss the possible nonlinearities of the cross section as a function of epsilon.

  20. Mapping of two-photon luminescence amplification in zinc-oxide microstructures

    SciTech Connect (OSTI)

    Semin, S. V., E-mail: sv_semin@mail.ru; Sherstyuk, N. E.; Mishina, E. D. [Moscow State Technical University of Radio Engineering, Electronics and Automation (Russian Federation); Gherman, C.; Kulyuk, L. [Academy of Sciences of Moldova, Institute of Applied Physics (Moldova, Republic of); Rasing, Th. [Radboud University Nijmegen, Institute for Molecules and Materials (Netherlands); Peng, L.-H. [National Taiwan University, Department of Electrical Engineering and Institute of Photonics and Optoelectronics (China)

    2012-03-15

    The mapping of two-photon excited luminescence in aggregations of free-standing zinc oxide microrods has been carried out at room temperature. Two-photon luminescence spectra in the excitonic region for individual microrods have been recorded. The luminescence intensity exhibits a power-law dependence on the optical pump power with the exponent n > 2. This fact, along with the existence of a threshold power above which the dependence in the exciton region deviates from a quadratic one, indicates the onset of light amplification in individual ZnO microrods and the conditions preceding laser oscillation.

  1. Present performance & future directions in two-photon addressed volumetric optical disk storage systems

    E-Print Network [OSTI]

    Esener, Sadik C.

    Present performance & future directions in two-photon addressed volumetric optical disk storage data storage is presented and future directions discussed. Influence of numerical aperture in a 3-D multi-layer optical data storage system is analyzed. Keywords: volumetric data storage, multi-layer data

  2. Proton form factors and two-photon exchange contribution to elastic electron-proton scattering

    E-Print Network [OSTI]

    Proton form factors and two-photon exchange contribution to elastic electron-proton scattering A. V Perspectives of High Energy Physics" Alexander Gramolin (Budker INP) Proton form factors and 2-exchange. . . September 4, 2010 1 / 18 #12;Proton electromagnetic form factors The proton's electric GE (Q2 ) and magnetic

  3. Characterizing point spread functions of two-photon fluorescence microscopy in turbid medium

    E-Print Network [OSTI]

    So, Peter

    - medical imaging. Among its advantages is the enhanced depth pen- etration permitted by fluorescence environment often found in tissue. A full characterization of the two-photon PSFs of a water and oil immersion to depths of about 100 (oil) and 200 m (water), the presence of scatterers (up to 2% Liposyn III) does

  4. Fast-scanning two-photon fluorescence imaging based on a microelectromechanical systems two-

    E-Print Network [OSTI]

    Schnitzer, Mark

    on microelectromechanical systems (MEMS) scanners. Single crystalline silicon scanning mirrors that are 0.75 mm 0.75 mm miniaturized. We report the use of microelectromechanical sys- tems (MEMS) scanners for filling this nicheFast-scanning two-photon fluorescence imaging based on a microelectromechanical systems two

  5. Dark pulses for resonant two-photon transitions P. Panek and A. Becker

    E-Print Network [OSTI]

    Becker, Andreas

    Dark pulses for resonant two-photon transitions P. Panek and A. Becker Max by tailoring the spectral phase function of the laser pulse 11,12 . Since no net transition is induced, such pulses are also called dark pulses. For transitions involving an interme- diate resonance, with shaped

  6. Two-photon excitation of atoms by ultrashort electromagnetic pulses in a discrete spectrum

    E-Print Network [OSTI]

    Astapenko, Valery

    2015-01-01

    The present work is dedicated to the theoretical analysis of two-photon excitation of atoms in a discrete energy spectrum by ultrashort electromagnetic pulses of femto- and subfemtosecond ranges of durations. As examples, excitation of hydrogen and sodium atoms from the ground state to excited states with a zero orbital moment is considered.

  7. Further search for the two-photon production of the glueball candidate f(J)(2220)

    E-Print Network [OSTI]

    Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Darling, C.; Davis, Robin E. P.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Zhou, L.

    1998-10-01

    The CLEO II detector at the e(+)e(-) storage ring CESR has been used to search for two-photon production of the f(J)(2220) decaying into pi(+)pi(-). No evidence fora signal is found in 4.77 fb(-1) of data and a 95% C.L. ...

  8. Optics in Computing OC03 Pa-OFB2 Two-photon volumetric optical disk storage systems

    E-Print Network [OSTI]

    Esener, Sadik C.

    Optics in Computing OC03 Pa-OFB2 Two-photon volumetric optical disk storage systems: experimental: sesener@ece.ucsd.edu ABSTRACT Recent performance in two-photon volumetric data storage is presented. Experimental results are presented and theoretical potentials are analyzed. Keywords: volumetric data storage

  9. Characterization of Two-Photon Excitation: Coherent Control and Nonlinear Propagation in Transparent Media 

    E-Print Network [OSTI]

    Poudel, Milan Prasad

    2010-10-12

    . In the region of spectral overlap of difference frequency generation and self phase modulation (Fig. 2.6), an interferometric beat signal can be detected. Due to the absence of walk-off effects and improved spatial overlap, the nonlinear interaction between... to optimize two-photon fluorescence with the ultimate goal of using in selective excitation of fluorophore or fluorescent proteins under the influence of a broadband femtosecond laser source. Phase-modulated femtosecond pulses can selectively excite one...

  10. Two-Photon, Two-gluon and Radiative Decays of Heavy Flavoured Mesons

    E-Print Network [OSTI]

    Arpit Parmar; Bhavin Patel; P C Vinodkumar

    2011-02-15

    Here we present the two-photon and two-gluon decay widths of the S-wave ($\\eta_{Q\\in c,b}$) and P-wave ($\\chi_{Q\\in c,bJ}$) charmonium and bottonium states and the radiative transition decay widths of $c\\bar c$, $b\\bar b$ and $c\\bar b$ systems based on Coulomb plus power form of the inter-quark potential ($CPP_\

  11. Stimulated emission of two photons in parametric amplification and its interpretation as multi-photon interference

    E-Print Network [OSTI]

    F. W. Sun; B. H. Liu; Y. X. Gong; Y. F. Huang; Z. Y. Ou; G. C. Guo

    2007-02-06

    Stimulated emission of two photons is observed experimentally in the parametric amplification process and is compared to a three-photon interference scheme. We find that the underlying physics of stimulated emission is simply the constructive interference due to photon indistinguishability. So the observed signal enhancement upon the input of photons is a result of multi-photon interference of the input photons and the otherwise spontaneously emitted photon from the amplifier.

  12. Calculation of the spatial resolution in two-photon absorption spectroscopy applied to plasma diagnosis

    SciTech Connect (OSTI)

    Garcia-Lechuga, M.; Fuentes, L. M.; Grützmacher, K.; Pérez, C. Rosa, M. I. de la

    2014-10-07

    We report a detailed characterization of the spatial resolution provided by two-photon absorption spectroscopy suited for plasma diagnosis via the 1S-2S transition of atomic hydrogen for optogalvanic detection and laser induced fluorescence (LIF). A precise knowledge of the spatial resolution is crucial for a correct interpretation of measurements, if the plasma parameters to be analysed undergo strong spatial variations. The present study is based on a novel approach which provides a reliable and realistic determination of the spatial resolution. Measured irradiance distribution of laser beam waists in the overlap volume, provided by a high resolution UV camera, are employed to resolve coupled rate equations accounting for two-photon excitation, fluorescence decay and ionization. The resulting three-dimensional yield distributions reveal in detail the spatial resolution for optogalvanic and LIF detection and related saturation due to depletion. Two-photon absorption profiles broader than the Fourier transform-limited laser bandwidth are also incorporated in the calculations. The approach allows an accurate analysis of the spatial resolution present in recent and future measurements.

  13. Transverse target spin asymmetry in inclusive DIS with two-photon exchange

    SciTech Connect (OSTI)

    Andrei Afanasev; Mark Strikman; Christian Weiss

    2007-09-06

    We study the transverse target spin dependence of the cross section for the inclusive electron-nucleon scattering with unpolarized beam. Such dependence is absent in the one-photon exchange approximation (Christ-Lee theorem) and arises only in higher orders of the QED expansion, from the interference of one-photon and absorptive two-photon exchange amplitudes as well as from real photon emission (bremsstrahlung). We demonstrate that the transverse spin-dependent two-photon exchange cross section is free of QED infrared and collinear divergences. We argue that in DIS kinematics the transverse spin dependence should be governed by a "parton-like" mechanism in which the two-photon exchange couples mainly to a single quark. We calculate the normal spin asymmetry in an approximation where the dominant contribution arises from quark helicity flip due to interactions with non-perturbative vacuum fields (constituent quark picture) and is proportional to the quark transversity distribution in the nucleon. Such helicity-flip processes are not significantly Sudakov-suppressed if the infrared scale for gluon emission in the photon-quark subprocess is of the order of the chiral symmetry breaking scale, mu^2_chiral>>Lambda^2_QCD. We estimate the asymmetry in the kinematics of the planned Jefferson Lab Hall A experiment to be of the order 10^-4, with different sign for proton and neutron. We also comment on the spin dependence in the limit of soft high-energy scattering.

  14. Non-degenerate two-photon absorption in silicon waveguides. Analytical and experimental study

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

    Zhang, Yanbing; Husko, Chad; Lefrancois, Simon; Rey, Isabella H.; Krauss, Thomas F.; Schröder, Jochen; Eggleton, Benjamin J.

    2015-06-22

    We theoretically and experimentally investigate the nonlinear evolution of two optical pulses in a silicon waveguide. We provide an analytic solution for the weak probe wave undergoing non-degenerate two-photon absorption (TPA) from the strong pump. At larger pump intensities, we employ a numerical solution to study the interplay between TPA and photo-generated free carriers. We develop a simple and powerful approach to extract and separate out the distinct loss contributions of TPA and free-carrier absorption from readily available experimental data. Our analysis accounts accurately for experimental results in silicon photonic crystal waveguides.

  15. Two-Photon Physics in Nucleus-Nucleus Collisions at RHIC

    E-Print Network [OSTI]

    Joakim Nystrand; Spencer Klein; the STAR Collaboration

    1998-11-18

    Ultra-relativistic heavy-ions carry strong electromagnetic and nuclear fields. Interactions between these fields in peripheral nucleus-nucleus collisions can probe many interesting physics topics. This presentation will focus on coherent two-photon and photonuclear processes at RHIC. The rates for these interactions will be high. The coherent coupling of all the protons in the nucleus enhances the equivalent photon flux by a factor Z^2 up to an energy of ~3 GeV. The plans for studying coherent interactions with the STAR experiment will be discussed. Experimental techniques for separating signal from background will be presented.

  16. Measurement of the Two Photon Decay Width of the Higgs Boson at the TESLA Photon Collider

    E-Print Network [OSTI]

    Aura Rosca; Klaus Moenig

    2003-10-02

    We report on the accuracy of the measurement of the two photon decay width of a Higgs boson with the mass of 120 GeV at the TESLA Photon Collider, assuming a $\\gamma \\gamma$ integrated luminosity of 80 fb$^{-1}$ in the hard part of the spectrum. The QCD radiative corrections for the quark pair background processes are taken into account by a reweighting procedure. We found that the product $\\Gamma (\\rm H \\to \\gamma \\gamma) \\times \\rm BR (\\rm H \\to \\rm b \\bar{\\rm b})$ can be measured with the statistical error of 1.8% in one year of run.

  17. Two-photon 3-D mapping of ex vivo human skin endogenous fluorescence species based on fluorescence emission spectra

    E-Print Network [OSTI]

    Laiho, Lily H.

    Spectral resolved tissue imaging has a broad range of biomedical applications such as the minimally invasive diagnosis of diseases and the study of wound healing and tissue engineering processes. Two-photon microscopy ...

  18. Two-photon laser excitation of trapped 232Th+ ions via the 402 nm resonance line

    E-Print Network [OSTI]

    Herrera-Sancho, O A; Zimmermann, K; Tamm, Chr; Peik, E; Taichenachev, A V; Yudin, V I; Glowacki, P

    2012-01-01

    Experiments on one- and two-photon laser excitation of 232Th+ ions in a radiofrequency ion trap are reported. As the first excitation step, the strongest resonance line at 402 nm from the 6d^2 7s J=3/2 ground state to the 6d7s7p J=5/2 state at 24874 cm^{-1} is driven by radiation from an extended cavity diode laser. Spontaneous decay of the intermediate state populates a number of low-lying metastable states, thus limiting the excited state population and fluorescence signal obtainable with continuous laser excitation. We study the collisional quenching efficiency of helium, argon, and nitrogen buffer gases, and the effect of repumping laser excitation from the three lowest-lying metastable levels. The experimental results are compared with a four-level rate equation model, that allows us to deduce quenching rates for these buffer gases. Using laser radiation at 399 nm for the second step, we demonstrate two-photon excitation to the state at 49960 cm^{-1}, among the highest-lying classified levels of Th+. Thi...

  19. Two-Photon Interactions with Nuclear Breakup in Relativistic Heavy Ion Collisions

    E-Print Network [OSTI]

    Anthony J. Baltz; Yuri Gorbunov; Spencer R. Klein; Joakim Nystrand

    2009-08-26

    Highly charged relativistic heavy ions have high cross-sections for two-photon interactions. The photon flux is high enough that two-photon interactions may be accompanied by additional photonuclear interactions. Except for the shared impact parameter, these interactions are independent. Additional interactions like mutual Coulomb excitation are of experimental interest, since the neutrons from the nuclear dissociation provide a simple, relatively unbiased trigger. We calculate the cross sections, rapidity, mass and transverse momentum ($p_T)$ distributions for exclusive $\\gamma\\gamma$ production of mesons and lepton pairs, and for $\\gamma\\gamma$ reactions accompanied by mutual Coulomb dissociation. The cross-sections for $\\gamma\\gamma$ interactions accompanied by multiple neutron emission ($XnXn$) and single neutron emission ($1n1n$) are about 1/10 and 1/100 of that for the unaccompanied $\\gamma\\gamma$ interactions. We discuss the accuracy with which these cross-sections may be calculated. The typical $p_T$ of $\\gamma\\gamma$ final states is several times smaller than for comparable coherent photonuclear interactions, so $p_T$ may be an effective tool for separating the two classes of interactions.

  20. Two-photon interactions with nuclear breakup in relativistic heavy ion collisions

    SciTech Connect (OSTI)

    Baltz, Anthony J.; Gorbunov, Yuri; Klein, Spencer R.; Nystrand, Joakim

    2009-10-15

    Highly charged relativistic heavy ions have high cross sections for two-photon interactions. The photon flux is high enough that two-photon interactions may be accompanied by additional photonuclear interactions. Except for the shared impact parameter, these interactions are independent. Additional interactions like mutual Coulomb excitation are of experimental interest, because the neutrons from the nuclear dissociation provide a simple, relatively unbiased trigger. We calculate the cross sections, rapidity, mass, and transverse momentum (p{sub T}) distributions for exclusive {gamma}{gamma} production of mesons and lepton pairs and for {gamma}{gamma} reactions accompanied by mutual Coulomb dissociation. The cross sections for {gamma}{gamma} interactions accompanied by multiple neutron emission (XnXn) and single-neutron emission (1n1n) are about 1/10 and 1/100 of that for the unaccompanied {gamma}{gamma} interactions. We discuss the accuracy with which these cross sections may be calculated. The typical p{sub T} of {gamma}{gamma} final states is several times smaller than for comparable coherent photonuclear interactions, so p{sub T} may be an effective tool for separating the two classes of interactions.

  1. Two-Photon Interactions with Nuclear Breakup in Relativistic Heavy Ion Collisions

    SciTech Connect (OSTI)

    Baltz, Anthony J.; Gorbunov, Yuri; R Klein, Spencer; Nystrand, Joakim

    2010-07-07

    Highly charged relativistic heavy ions have high cross-sections for two-photon interactions. The photon flux is high enough that two-photon interactions may be accompanied by additional photonuclear interactions. Except for the shared impact parameter, these interactions are independent. Additional interactions like mutual Coulomb excitation are of experimental interest, since the neutrons from the nuclear dissociation provide a simple, relatively unbiased trigger. We calculate the cross sections, rapidity, mass and transverse momentum (p{sub T}) distributions for exclusive {gamma}{gamma} production of mesons and lepton pairs, and for {gamma}{gamma} reactions accompanied by mutual Coulomb dissociation. The cross-sections for {gamma}{gamma} interactions accompanied by multiple neutron emission (XnXn) and single neutron emission (1n1n) are about 1/10 and 1/100 of that for the unaccompanied {gamma}{gamma} interactions. We discuss the accuracy with which these cross-sections may be calculated. The typical p{sub T} of {gamma}{gamma} final states is several times smaller than for comparable coherent photonuclear interactions, so p{sub T} may be an effective tool for separating the two classes of interactions.

  2. Two-photon induced fluorescence and other optical effects in irradiated and doped fused silica

    SciTech Connect (OSTI)

    Kramer, S.D.

    1986-07-01

    The objective of this program was to assess and identify irradiation techniques which could be used to modify the optical charactistics of doped fused silica. Primary emphasis was placed on determining if gamma ray or neutron bombardment of the glass would enhance certain Raman and nonlinear optical effects. In particular, the effect of irradiation on optical two photon induced fluorescence was studied in detail. The maximum radiation exposures used were 10/sup 6/ rads (Si) of gamma rays and neutron fluences of 1 x 10/sup 14/ neutrons/cm/sup 2/. The optical measurements were made at room temperature between one and four months after irradiation. The maximum input light intensity was 10/sup 9/ watts/cm/sup 2/ at a near infrared (1.06 ..mu..) input wavelength which was chosen to lie in a transparent spectral region of the glass. Under these experimental conditions a careful search revealed no detectable two-photon induced fluorescence in the region from 550 to 900 nm. The upper limit for the photon efficiency of this process was determined to be less than 1 x 10/sup -10/%. 89 refs., 12 figs.

  3. Evaluation of the two-photon absorption characteristics of GaSb/GaAs quantum rings

    SciTech Connect (OSTI)

    Wagener, M. C.; Botha, J. R.; Carrington, P. J.; Krier, A.

    2014-07-28

    The optical parameters describing the sub-bandgap response of GaSb/GaAs quantum rings solar cells have been obtained from photocurrent measurements using a modulated pseudo-monochromatic light source in combination with a second, continuous photo-filling source. By controlling the charge state of the quantum rings, the photoemission cross-sections describing the two-photon sub-bandgap transitions could be determined independently. Temperature dependent photo-response measurements also revealed that the barrier for thermal hole emission from the quantum rings is significantly below the quantum ring localisation energy. The temperature dependence of the sub-bandgap photo-response of the solar cell is also described in terms of the photo- and thermal-emission characteristics of the quantum rings.

  4. The two-photon exchange contribution to muonic hydrogen from chiral perturbation theory

    E-Print Network [OSTI]

    Clara Peset; Antonio Pineda

    2015-03-07

    We compute the spin-dependent and spin-independent structure functions of the forward virtual-photon Compton tensor of the proton at one loop using heavy baryon effective theory including the Delta particle. We compare with previous results when existing. Using these results we obtain the leading hadronic contributions, associated to the pion and Delta particles, to the Wilson coefficients of the lepton-proton four fermion operators in NRQED. The spin-independent coefficient yields a pure prediction for the two-photon exchange contribution to the muonic hydrogen Lamb shift, $\\Delta E_{\\rm TPE}(\\pi\\&\\Delta)=34(13)$ $\\mu$eV. We also compute the charge, $\\langle r^n \\rangle$, and Zemach, $\\langle r^n \\rangle_{(2)}$, moments for $n \\geq 3$. Finally, we discuss the spin-dependent case, for which we compute the difference between the four-fermion Wilson coefficients relevant for hydrogen and muonic hydrogen.

  5. The two-photon exchange contribution to muonic hydrogen from chiral perturbation theory

    E-Print Network [OSTI]

    Peset, Clara

    2014-01-01

    We compute the spin-dependent and spin-independent structure functions of the forward virtual-photon Compton tensor of the proton at one loop using heavy baryon effective theory including the Delta particle. We compare with previous results when existing. Using these results we obtain the leading hadronic contributions, associated to the pion and Delta particles, to the Wilson coefficients of the lepton-proton four fermion operators in NRQED. The spin-independent coefficient yields a pure prediction for the two-photon exchange contribution to the muonic hydrogen Lamb shift, $\\Delta E_{\\rm TPE}(\\pi\\&\\Delta)=34(13)$ $\\mu$eV. We also compute the charge, $\\langle r^n \\rangle$, and Zemach, $\\langle r^n \\rangle_{(2)}$, moments for $n \\geq 3$. Finally, we discuss the spin-dependent case, for which we compute the difference between the four-fermion Wilson coefficients relevant for hydrogen and muonic hydrogen.

  6. Two-photon Absorption In Quantum Dots,quantum Dashes And Related Materials

    SciTech Connect (OSTI)

    Jain, Ravinder

    2009-08-31

    We have proposed the use of USQDs for various deep-tissue biological imaging applications, notably wavelength-multiplexed multicolor imaging and intra-nuclear studies such as those involving cell apoptosis, and have studied the issue of maximizing two-photon absorption-induced fluorescence (TPAF) signals from CdSe/ZnS USQDs to be used for this application. In particular, using 2 nm USQDs, we have shown that the TPAF signal at 780 nm is ~ 8 times that at 850 nm and 68 times that at 900 nm, two wavelengths that have been used in previous studies using CdSe/ZnS SQDs for deep-tissue imaging of biological studies via TPAF .

  7. Electron correlations and two-photon states in polycyclic aromatic hydrocarbon molecules: A peculiar role of geometry

    SciTech Connect (OSTI)

    Aryanpour, Karan; Shukla, Alok; Mazumdar, Sumit; College of Optical Sciences, University of Arizona, Tucson, Arizona 85721

    2014-03-14

    We present numerical studies of one- and two-photon excited states ordering in a number of polycyclic aromatic hydrocarbon molecules: coronene, hexa-peri-hexabenzocoronene, and circumcoronene, all possessing D{sub 6h} point group symmetry versus ovalene with D{sub 2h} symmetry, within the Pariser-Parr-Pople model of interacting ?-electrons. The calculated energies of the two-photon states as well as their relative two-photon absorption cross-sections within the interacting model are qualitatively different from single-particle descriptions. More remarkably, a peculiar role of molecular geometry is found. The consequence of electron correlations is far stronger for ovalene, where the lowest spin-singlet two-photon state is a quantum superposition of pairs of lowest spin triplet states, as in the linear polyenes. The same is not true for D{sub 6h} group hydrocarbons. Our work indicates significant covalent character, in valence bond language, of the ground state, the lowest spin triplet state and a few of the lowest two-photon states in D{sub 2h} ovalene but not in those with D{sub 6h} symmetry.

  8. Employee Show

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

    Where Science Inspires Art Fermilab Employee Art Show 2015 Exhibition Dates -September 18, 2015 November 30, 2015 Reception - September 23, 2015 5 7pm Eligibility: Any current...

  9. Two Photon Absorption And Refraction in Bulk of the Semiconducting Materials

    SciTech Connect (OSTI)

    Kumari, Vinay [Department of Physics, BMIET Sonepat, Haryana (India); Department of Physics, DCRUST Murthal, Haryana (India); Kumar, Vinod [Department of Physics, Gurukula Kangri University, Haridwar (India); Malik, B. P. [Department of Physics, DCRUST Murthal, Haryana (India); Mohan, Devendra [Department of Applied Physics, GJUS and T, Hisar, Haryana (India); Gaur, Arun [Department of Physics, Hindu PG College (Sonepat), Haryana (India)

    2011-10-20

    Fast electronic detection systems have opened up a number of new fields like nonlinear optics, optical communication, coherent optics, optical bistability, two/four wave mixing. The interest in this field has been stimulated by the importance of multiphoton processes in many fundamental aspects of physics. It has proved to be an invaluable tool for determining the optical and electronic properties of the solids because of the fact that one gets the information about the bulk of the material rather than the surface one. In this paper we report, the measurement of the nonlinear absorption and refraction from the band gap to half-band gap region of bulk of semiconductors in the direct and indirect band gap crystals with nanosecond laser. The measured theoretical calculated values of two-photon absorption coefficients ({beta}) and nonlinear refraction n{sub 2}({omega}) of direct band gap crystal match the earlier reported theoretical predictions. By making use of these theoretical calculated values, we have estimated {beta} and n{sub 2}({omega}) in the case of indirect band gap crystals. Low value of absorption coefficient in case of indirect band gap crystals have been attributed to phonon assisted transition while reduction in nonlinear refraction is due to the rise in saturation taking place in the absorption.

  10. 3D microfabrication of single-wall carbon nanotube/polymer composites by two-photon polymerization lithography

    E-Print Network [OSTI]

    Natelson, Douglas

    3D microfabrication of single-wall carbon nanotube/polymer composites by two-photon polymerization online 16 March 2013 A B S T R A C T We present a method to develop single-wall carbon nanotube (SWCNT)/polymer-photon polymerization lithography, allows one to fabricate three-dimensional SWCNT/polymer composites with a minimum

  11. Excited electron dynamics in bulk ytterbium: Time-resolved two-photon photoemission and GW+T ab initio calculations

    E-Print Network [OSTI]

    Aeschlimann, Martin

    relaxation dynamics is played by the electronic structure of the system close to the Fermi level. For exampleExcited electron dynamics in bulk ytterbium: Time-resolved two-photon photoemission and GW+T ab November 2007 The excited electron dynamics in ytterbium is investigated by means of the time-resolved two

  12. Search for the standard model Higgs boson decaying into two photons in pp collisions at ?s = 7 TeV

    E-Print Network [OSTI]

    CMS Collaboration

    A search for a Higgs boson decaying into two photons is described. The analysis is performed using a dataset recorded by the CMS experiment at the LHC from pp collisions at a center-of-mass energy of 7 TeV, which corresponds ...

  13. Chirping a two-photon transition in a multistate ladder RID C-2713-2008 RID A-7617-2010 

    E-Print Network [OSTI]

    Merkel, Wolfgang; Mack, Holger; Schleich, Wolfgang P.; Lutz, Eric; Paulus, Gerhard G.; Girard, Bertrand

    2007-01-01

    We consider a two-photon transition in a specific ladder system driven by a chirped laser pulse. In the weak field limit, we find that the excited state probability amplitude arises due to interference of multiple quantum paths which are weighted...

  14. Theory of the Energy Levels and Precise Two--Photon Spectroscopy of Atomic Hydrogen and Deuterium 1

    E-Print Network [OSTI]

    Pachucki, Krzysztof

    Theory of the Energy Levels and Precise Two--Photon Spectroscopy of Atomic Hydrogen and Deuterium 1 of the energy levels of simple hydrogenic systems. We review recent two­photon spectroscopic measurements performed in Garching and the relevant theoretical predictions for the hydrogen energy levels. A good

  15. Waveguide QED: Power Spectra and Correlations of Two Photons Scattered Off Multiple Distant Qubits and a Mirror

    E-Print Network [OSTI]

    Yao-Lung L. Fang; Harold U. Baranger

    2015-05-25

    We study two-level systems (2LS) coupled at different points to a one-dimensional waveguide in which one end is open and the other is either open (infinite waveguide) or closed by a mirror (semi-infinite). Upon injection of two photons (corresponding to weak coherent driving), the resonance fluorescence and photon correlations are shaped by the effective qubit transition frequencies and decay rates, which are substantially modified by interference effects. In contrast to the well-known result in an infinite waveguide, photons reflected by a single 2LS coupled to a semi-infinite waveguide are initially bunched, a result that can be simply explained by stimulated emission. As the number of 2LS increases (up to 10 are considered here), rapid oscillations build up in the correlations that persist for a very long time. For instance, when the incoming photons are slightly detuned, the transmitted photons in the infinite waveguide are highly antibunched. On the other hand, upon resonant driving, incoherently reflected photons are mostly distributed within the photonic band gap and several sharp side peaks. These features can be explained by considering the poles of the single particle Green function in the Markovian regime combined with the time delay. Our calculation is not restricted to the Markovian regime, and we obtain several fully non-Markovian results. We show that a single 2LS in a semi-infinite waveguide can not be decoupled by placing it at the node of the photonic field, in contrast to recent results in the Markovian regime. Our results illustrate the complexities that ensue when several qubits are strongly coupled to a bus (the waveguide) as might happen in quantum information processing.

  16. Two-photon Photoemission of Organic Semiconductor Molecules on Ag(111)

    SciTech Connect (OSTI)

    Yang, Aram; Yang, Aram

    2008-05-15

    Angle- and time-resolved two-photon photoemission (2PPE) was used to study systems of organic semiconductors on Ag(111). The 2PPE studies focused on electronic behavior specific to interfaces and ultrathin films. Electron time dynamics and band dispersions were characterized for ultrathin films of a prototypical n-type planar aromatic hydrocarbon, PTCDA, and representatives from a family of p-type oligothiophenes.In PTCDA, electronic behavior was correlated with film morphology and growth modes. Within a fewmonolayers of the interface, image potential states and a LUMO+1 state were detected. The degree to which the LUMO+1 state exhibited a band mass less than a free electron mass depended on the crystallinity of the layer. Similarly, image potential states were measured to have free electron-like effective masses on ordered surfaces, and the effective masses increased with disorder within the thin film. Electron lifetimes were correlated with film growth modes, such that the lifetimes of electrons excited into systems created by layer-by-layer, amorphous film growth increased by orders of magnitude by only a few monolayers from the surface. Conversely, the decay dynamics of electrons in Stranski-Krastanov systems were limited by interaction with the exposed wetting layer, which limited the barrier to decay back into the metal.Oligothiophenes including monothiophene, quaterthiophene, and sexithiophene were deposited on Ag(111), and their electronic energy levels and effective masses were studied as a function of oligothiophene length. The energy gap between HOMO and LUMO decreased with increasing chain length, but effective mass was found to depend on domains from high- or low-temperature growth conditions rather than chain length. In addition, the geometry of the molecule on the surface, e.g., tilted or planar, substantially affected the electronic structure.

  17. Two-photon interference and coherent control of single InAs quantum dot emissions in an Ag-embedded structure

    SciTech Connect (OSTI)

    Liu, X., E-mail: iu.xiangming@nims.go.jp [Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0021 (Japan); National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan); Kumano, H.; Nakajima, H.; Odashima, S.; Asano, T.; Suemune, I. [Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0021 (Japan); Kuroda, T. [National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan)

    2014-07-28

    We have recently reported the successful fabrication of bright single-photon sources based on Ag-embedded nanocone structures that incorporate InAs quantum dots. The source had a photon collection efficiency as high as 24.6%. Here, we show the results of various types of photonic characterizations of the Ag-embedded nanocone structures that confirm their versatility as regards a broad range of quantum optical applications. We measure the first-order autocorrelation function to evaluate the coherence time of emitted photons, and the second-order correlation function, which reveals the strong suppression of multiple photon generation. The high indistinguishability of emitted photons is shown by the Hong-Ou-Mandel-type two-photon interference. With quasi-resonant excitation, coherent population flopping is demonstrated through Rabi oscillations. Extremely high single-photon purity with a g{sup (2)}(0) value of 0.008 is achieved with ?-pulse quasi-resonant excitation.

  18. Resonant two-photon ionization spectroscopy of NiC Dale J. Brugh and Michael D. Morse

    E-Print Network [OSTI]

    Morse, Michael D.

    Resonant two-photon ionization spectroscopy of NiC Dale J. Brugh and Michael D. Morse University investigation of jet-cooled diatomic NiC has revealed a complex pattern of vibronic levels in the wave number as far to the blue as 26 951 cm 1 indicates that D0 NiC 3.34 eV, and the ionization energy of NiC has

  19. Angular distributions from two-photon detachment of H- near ionization threshold: Laser-frequency and -intensity effects

    E-Print Network [OSTI]

    Chu, Shih-I; Telnov, Dmitry A.

    2002-12-18

    .80.Rm, 32.80.Gc lations @11,12#. Detailed Floquet studies of the frequency- and intensity-dependent multiphoton detachment of H2 @13# using this model potential were in good agreement with the Los Alamos experimental data @14#, as well as the two...-photon threshold @17#, again using this model poten- tial, is also in good harmony with the recent experimental work in Los Alamos @7# and Aarhus @6#, respectively. The angle-integrated multiphoton detachment rates, presented in the same work @16,17#, agree well...

  20. Dynamic characterization of hydrophobic and hydrophilic solutes in oleic-acid enhanced transdermal delivery using two-photon fluorescence microscopy

    SciTech Connect (OSTI)

    Tseng, Te-Yu; Yang, Chiu-Sheng; Chen, Yang-Fang [Department of Physics, National Taiwan University, Taipei, Taiwan (China); Tsai, Tsung-Hua [Department of Dermatology, Far Eastern Memorial Hospital, New Taipei City, Taiwan (China); Dong, Chen-Yuan, E-mail: cydong@phys.ntu.edu.tw [Department of Physics, National Taiwan University, Taipei, Taiwan (China); Center for Quantum Science and Engineering, National Taiwan University, Taipei, Taiwan (China); Center for Optoelectronic Biomedicine, National Taiwan University, Taipei, Taiwan (China)

    2014-10-20

    In this letter, we propose an efficient methodology of investigating dynamic properties of sulforhodamine B and rhodamine B hexyl ester molecules transporting across ex-vivo human stratum corneum with and without oleic acid enhancement. Three-dimensional, time-lapse fluorescence images of the stratum corneum can be obtained using two-photon fluorescence microscopy. Furthermore, temporal quantifications of transport enhancements in diffusion parameters can be achieved with the use of Fick's second law. Dynamic characterization of solutes transporting across the stratum corneum is an effective method for understanding transient phenomena in transdermal delivery of probe molecules, leading to improved delivery strategies of molecular species for therapeutic purposes.

  1. Time-resolved measurement of photon states using two-photon interference with photons from short-time reference pulses

    E-Print Network [OSTI]

    Changliang Ren; Holger F. Hofmann

    2011-06-01

    To fully utilize the energy-time degree of freedom of photons for optical quantum information processes, it is necessary to control and characterize the quantum states of the photons at extremely short time scales. For measurements beyond the time resolution of available detectors, two-photon interference with a photon in a short time reference pulse may be a viable alternative. In this paper, we derive the temporal measurement operators for the bunching statistics of a single photon input state with a reference photon. It is shown that the effects of the pulse shape of the reference pulse can be expressed in terms of a spectral filter selecting the bandwidth within which the measurement can be treated as an ideal projection on eigenstates of time. For full quantum tomography, temporal coherence can be determined by using superpositions of reference pulses at two different times. Moreover, energy-time entanglement can be evaluated based on the two-by-two entanglement observed in the coherences between pairs of detection times.

  2. First study of ?c(1S), ?(1760) and X(1835) production via ?'???? final states in two-photon collisions

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

    Zhang, C. C.; Aihara, H.; Asner, D. M.; Aushev, T.; Bakich, A. M.; Ban, Y.; Belous, K.; Bischofberger, M.; Browder, T. E.; Chen, A.; Cheon, B. G.; Chilikin, K.; Chistov, R.; Choi, Y.; Dalseno, J.; Danilov, M.; Eidelman, S.; Feindt, M.; Gaur, V.; Gabyshev, N.; Goh, Y. M.; Han, Y. L.; Hayashii, H.; Horii, Y.; Hou, W.-S.; Hyun, H. J.; Iijima, T.; Inami, K.; Ishikawa, A.; Iwabuchi, M.; Julius, T.; Kiesling, C.; Kim, H. O.; Kim, M. J.; Kim, Y. J.; Ko, B. R.; Kodyš, P.; Korpar, S.; Krokovny, P.; Kuzmin, A.; Li, J.; Libby, J.; Liu, Y.; Liu, Z. Q.; Louvot, R.; Matvienko, D.; McOnie, S.; Mizuk, R.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nishida, S.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Pakhlov, P.; Pakhlova, G.; Park, H.; Park, H. K.; Pestotnik, R.; Petri?, M.; Piilonen, L. E.; Röhrken, M.; Ryu, S.; Sahoo, H.; Sakai, Y.; Santel, D.; Sanuki, T.; Schneider, O.; Schwanda, C.; Sevior, M. E.; Shapkin, M.; Shebalin, V.; Shen, C. P.; Shibata, T.-A.; Shiu, J.-G.; Shwartz, B.; Smerkol, P.; Sohn, Y.-S.; Solovieva, E.; Stani?, S.; Stari?, M.; Sumihama, M.; Sumiyoshi, T.; Tikhomirov, I.; Uchida, M.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Varner, G.; Vinokurova, A.; Vorobyev, V.; Wang, P.; Wang, X. L.; Watanabe, Y.; Williams, K. M.; Yabsley, B. D.; Yamashita, Y.; Yuan, C. Z.; Zhang, Z. P.; Zhulanov, V.

    2012-09-01

    The invariant mass spectrum of the ?'???? final state produced in two-photon collisions is obtained using a 673 fb?¹ data sample collected in the vicinity of the ?(4S) resonance with the Belle detector at the KEKB asymmetric-energy e?e? collider. We observe a clear signal of the ?c(1S) and measure its mass and width to be M(?c(1S))=(2982.7±1.8(stat)±2.2(syst)±0.3(model)) MeV/c² and ?(?c(1S))=(37.8+5.8–5.3(stat)±2.8(syst)±1.4(model)) MeV/c². The third error is an uncertainty due to possible interference between the ?c(1S) and a nonresonant component. We also report the first evidence for ?(1760) decay to?'????; we find two solutions for its parameters, depending on the inclusion or not of the X(1835), whose existence is of marginal significance in our data. From a fit to the mass spectrum using coherent X(1835) and ?(1760) resonant amplitudes, we set a 90% confidence level upper limit on the product ???B(?'????) for the X(1835).

  3. First study of ?c(1S), ?(1760) and X(1835) production via ?'???? final states in two-photon collisions

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

    Zhang, C. C.; Aihara, H.; Asner, D. M.; Aushev, T.; Bakich, A. M.; Ban, Y.; Belous, K.; Bischofberger, M.; Browder, T. E.; Chen, A.; et al

    2012-09-01

    The invariant mass spectrum of the ?'???? final state produced in two-photon collisions is obtained using a 673 fb?¹ data sample collected in the vicinity of the ?(4S) resonance with the Belle detector at the KEKB asymmetric-energy e?e? collider. We observe a clear signal of the ?c(1S) and measure its mass and width to be M(?c(1S))=(2982.7±1.8(stat)±2.2(syst)±0.3(model)) MeV/c² and ?(?c(1S))=(37.8+5.8–5.3(stat)±2.8(syst)±1.4(model)) MeV/c². The third error is an uncertainty due to possible interference between the ?c(1S) and a nonresonant component. We also report the first evidence for ?(1760) decay to?'????; we find two solutions for its parameters, depending on the inclusion or notmore »of the X(1835), whose existence is of marginal significance in our data. From a fit to the mass spectrum using coherent X(1835) and ?(1760) resonant amplitudes, we set a 90% confidence level upper limit on the product ???B(?'????) for the X(1835).« less

  4. NEAR-IR TWO PHOTON MICROSCOPY IMAGING OF SILICA NANOPARTICLES FUNCTIONALIZED WITH ISOLATED SENSITIZED Yb(III) CENTERS

    SciTech Connect (OSTI)

    Lapadula, Giuseppe; Bourdolle, Adrien; Allouche, Florian; Conley, Matthew P.; Maron, Laurent; Lukens, Wayne W.; Guyot, Yannick; Andraud, Chantal; Brasselet, Sophie; Copé; ret, Christophe; Maury, Olivier; Andersen, Richard A.

    2013-01-12

    Bright nano objects emitting in the near infrared with a maximal cross section of 41.4 x 103 GM (Goppert Mayer), were prepared by implanting ca. 180 4,4 diethylaminostyryl 2,2 bipyridine (DEAS) Yb(III) complexes on the surface of 12 nm silica nanoparticles. The surface complexes ([DEAS Ln SiO2], Ln =Y,Yb) were characterized using IR, solid state NMR, UV Vis, EXAFS spectroscopies in combination with the preparation and characterization of similar molecular analogues by analytical techniques (IR, solution NMR, UV Vis, X ray crystallography) as well as DFT calculations. Starting from the partial dehydroxylation of the silica at 700 C on high vacuum having 0.8 OH.nm 2, the grafting of Ln(N(SiMe3)2)3 generate ?SiO Ln(N(SiMe3)2)2, which upon thermal step and coordination of the DEAS chromophore yields (?SiO)3Ln(DEAS). Surface and molecular analogues display similar properties, in terms of DEAS binding constants absorption maxima and luminescence properties (intense emission band assigned to a ligand centered CT fluorescence and life time) in the solid state, consistent with the molecular nature of the surface species. The densely functionalized nanoparticles can be dispersed via ultra-sonication in small ca. 15-20 nm aggregates (1 to 6 elementary particles) that were detected using two photon microscopy imaging at 720 nm excitation, making them promising nano objects for bio imaging.

  5. Search for a Higgs-like boson decaying to two photons in proton antiproton collisions at center of mass energy of 1.96 TeV

    E-Print Network [OSTI]

    Chen, Guo

    2013-05-31

    We present a search for the Standard Model (SM) Higgs boson decaying to two photons using the 9.6 fb-1 of proton antiproton collisions at center of mass energy of 1.96 TeV collected by the D0 detector at the Tevatron from ...

  6. Demonstration of a novel technique to measure two-photon exchange effects in elastic $e^\\pm p$ scattering

    E-Print Network [OSTI]

    M. Moteabbed; M. Niroula; B. A. Raue; L. B. Weinstein; D. Adikaram; J. Arrington; W. K. Brooks; J. Lachniet; Dipak Rimal; M. Ungaro; K. P. Adhikari; M. Aghasyan; M. J. Amaryan; S. Anefalos Pereira; H. Avakian; J. Ball; N. A. Baltzell; M. Battaglieri; V. Batourine; I. Bedlinskiy; R. P. Bennett; A. S. Biselli; J. Bono; S. Boiarinov; W. J. Briscoe; V. D. Burkert; D. S. Carman; A. Celentano; S. Chandavar; P. L. Cole; P. Collins; M. Contalbrigo; O. Cortes; V. Crede; A. D'Angelo; N. Dashyan; R. De Vita; E. De Sanctis; A. Deur; C. Djalali; D. Doughty; R. Dupre; H. Egiyan; L. El Fassi; P. Eugenio; G. Fedotov; S. Fegan; R. Fersch; J. A. Fleming; N. Gevorgyan; G. P. Gilfoyle; K. L. Giovanetti; F. X. Girod; J. T. Goetz; W. Gohn; E. Golovatch; R. W. Gothe; K. A. Griffioen; M. Guidal; N. Guler; L. Guo; K. Hafidi; H. Hakobyan; C. Hanretty; N. Harrison; D. Heddle; K. Hicks; D. Ho; M. Holtrop; C. E. Hyde; Y. Ilieva; D. G. Ireland; B. S. Ishkhanov; E. L. Isupov; H. S. Jo; K. Joo; D. Keller; M. Khandaker; A. Kim; F. J. Klein; S. Koirala; A. Kubarovsky; V. Kubarovsky; S. E. Kuhn; S. V. Kuleshov; S. Lewis; H. Y. Lu; M. MacCormick; I . J . D. MacGregor; D. Martinez; M. Mayer; B. McKinnon; T. Mineeva; M. Mirazita; V. Mokeev; R. A. Montgomery; K. Moriya; H. Moutarde; E. Munevar; C. Munoz Camacho; P. Nadel-Turonski; R. Nasseripour; S. Niccolai; G. Niculescu; I. Niculescu; M. Osipenko; A. I. Ostrovidov; L. L. Pappalardo; R. Paremuzyan; K. Park; S. Park; E. Phelps; J. J. Phillips; S. Pisano; O. Pogorelko; S. Pozdniakov; J. W. Price; S. Procureur; D. Protopopescu; A. J. R. Puckett; M. Ripani; G. Rosner; P. Rossi; F. Sabatié; M. S. Saini; C. Salgado; D. Schott; R. A. Schumacher; E. Seder; H. Seraydaryan; Y. G. Sharabian; E. S. Smith; G. D. Smith; D. I. Sober; D. Sokhan; S. Stepanyan; S. Strauch; W. Tang; C. E. Taylor; Ye Tian; S. Tkachenko; H. Voskanyan; E. Voutier; N. K. Walford; M. H. Wood; N. Zachariou; L. Zana; J. Zhang; Z. W. Zhao; I. Zonta

    2013-07-10

    The discrepancy between proton electromagnetic form factors extracted using unpolarized and polarized scattering data is believed to be a consequence of two-photon exchange (TPE) effects. However, the calculations of TPE corrections have significant model dependence, and there is limited direct experimental evidence for such corrections. We present the results of a new experimental technique for making direct $e^\\pm p$ comparisons, which has the potential to make precise measurements over a broad range in $Q^2$ and scattering angles. We use the Jefferson Lab electron beam and the Hall B photon tagger to generate a clean but untagged photon beam. The photon beam impinges on a converter foil to generate a mixed beam of electrons, positrons, and photons. A chicane is used to separate and recombine the electron and positron beams while the photon beam is stopped by a photon blocker. This provides a combined electron and positron beam, with energies from 0.5 to 3.2 GeV, which impinges on a liquid hydrogen target. The large acceptance CLAS detector is used to identify and reconstruct elastic scattering events, determining both the initial lepton energy and the sign of the scattered lepton. The data were collected in two days with a primary electron beam energy of only 3.3 GeV, limiting the data from this run to smaller values of $Q^2$ and scattering angle. Nonetheless, this measurement yields a data sample for $e^\\pm p$ with statistics comparable to those of the best previous measurements. We have shown that we can cleanly identify elastic scattering events and correct for the difference in acceptance for electron and positron scattering. The final ratio of positron to electron scattering: $R=1.027\\pm0.005\\pm0.05$ for $=0.206$ GeV$^2$ and $0.830\\leq \\epsilon\\leq 0.943$.

  7. Channel-capacity gain in entanglement-assisted communication protocols based exclusively on linear optics, single-photon inputs, and coincidence photon counting

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

    Lougovski, P.; Uskov, D. B.

    2015-08-04

    Entanglement can effectively increase communication channel capacity as evidenced by dense coding that predicts a capacity gain of 1 bit when compared to entanglement-free protocols. However, dense coding relies on Bell states and when implemented using photons the capacity gain is bounded by 0.585 bits due to one's inability to discriminate between the four optically encoded Bell states. In this research we study the following question: Are there alternative entanglement-assisted protocols that rely only on linear optics, coincidence photon counting, and separable single-photon input states and at the same time provide a greater capacity gain than 0.585 bits? In thismore »study, we show that besides the Bell states there is a class of bipartite four-mode two-photon entangled states that facilitate an increase in channel capacity. We also discuss how the proposed scheme can be generalized to the case of two-photon N-mode entangled states for N=6,8.« less

  8. Demonstration of a novel technique to measure two-photon exchange effects in elastic e±p scattering

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

    Moteabbed, Maryam [Florida Institute of Technology; Niroula, Megh [Old Dominion University; Raue, Brian [Florida International University; Weinstein, Lawrence [Old Dominion University

    2013-08-01

    The discrepancy between proton electromagnetic form factors extracted using unpolarized and polarized scattering data is believed to be a consequence of two-photon exchange (TPE) effects. However, the calculations of TPE corrections have significant model dependence, and there is limited direct experimental evidence for such corrections. The TPE contributions depend on the sign of the lepton charge in e±p scattering, but the luminosities of secondary positron beams limited past measurement at large scattering angles, where the TPE effects are believe to be most significant. We present the results of a new experimental technique for making direct e±p comparisons, which has the potential to make precise measurements over a broad range in Q2 and scattering angles. We use the Jefferson Laboratory electron beam and the Hall B photon tagger to generate a clean but untagged photon beam. The photon beam impinges on a converter foil to generate a mixed beam of electrons, positrons, and photons. A chicane is used to separate and recombine the electron and positron beams while the photon beam is stopped by a photon blocker. This provides a combined electron and positron beam, with energies from 0.5 to 3.2 GeV, which impinges on a liquid hydrogen target. The large acceptance CLAS detector is used to identify and reconstruct elastic scattering events, determining both the initial lepton energy and the sign of the scattered lepton. The data were collected in two days with a primary electron beam energy of only 3.3 GeV, limiting the data from this run to smaller values of Q2 and scattering angle. Nonetheless, this measurement yields a data sample for e±p with statistics comparable to those of the best previous measurements. We have shown that we can cleanly identify elastic scattering events and correct for the difference in acceptance for electron and positron scattering. Because we ran with only one polarity for the chicane, we are unable to study the difference between the incoming electron and positron beams. This systematic effect leads to the largest uncertainty in the final ratio of positron to electron scattering: R=1.027±0.005±0.05 for 2 >=0.206 GeV2 and 0.830 ? ? ? 0.943. We have demonstrated that the tertiary e± beam generated using this technique provides the opportunity for dramatically improved comparisons of e±p scattering, covering a significant range in both Q2 and scattering angle. Combining data with different chicane polarities will allow for detailed studies of the difference between the incoming e+ and e- beams.

  9. Demonstration of a novel technique to measure two-photon exchange effects in elastic e±p scattering

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

    Moteabbed, Maryam; Niroula, Megh; Raue, Brian A.; Weinstein, Lawrence B.

    2013-08-30

    The discrepancy between proton electromagnetic form factors extracted using unpolarized and polarized scattering data is believed to be a consequence of two-photon exchange (TPE) effects. However, the calculations of TPE corrections have significant model dependence, and there is limited direct experimental evidence for such corrections. The TPE contributions depend on the sign of the lepton charge in e±p scattering, but the luminosities of secondary positron beams limited past measurement at large scattering angles, where the TPE effects are believe to be most significant. We present the results of a new experimental technique for making direct e±p comparisons, which has themore »potential to make precise measurements over a broad range in Q2 and scattering angles. We use the Jefferson Laboratory electron beam and the Hall B photon tagger to generate a clean but untagged photon beam. The photon beam impinges on a converter foil to generate a mixed beam of electrons, positrons, and photons. A chicane is used to separate and recombine the electron and positron beams while the photon beam is stopped by a photon blocker. This provides a combined electron and positron beam, with energies from 0.5 to 3.2 GeV, which impinges on a liquid hydrogen target. The large acceptance CLAS detector is used to identify and reconstruct elastic scattering events, determining both the initial lepton energy and the sign of the scattered lepton. The data were collected in two days with a primary electron beam energy of only 3.3 GeV, limiting the data from this run to smaller values of Q2 and scattering angle. Nonetheless, this measurement yields a data sample for e±p with statistics comparable to those of the best previous measurements. We have shown that we can cleanly identify elastic scattering events and correct for the difference in acceptance for electron and positron scattering. Because we ran with only one polarity for the chicane, we are unable to study the difference between the incoming electron and positron beams. This systematic effect leads to the largest uncertainty in the final ratio of positron to electron scattering: R=1.027±0.005±0.05 for 2 >=0.206 GeV2 and 0.830 ? ? ? 0.943. We have demonstrated that the tertiary e± beam generated using this technique provides the opportunity for dramatically improved comparisons of e±p scattering, covering a significant range in both Q2 and scattering angle. Combining data with different chicane polarities will allow for detailed studies of the difference between the incoming e+ and e- beams.« less

  10. Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV

    SciTech Connect (OSTI)

    Chatrchyan, S.; et al.,

    2012-04-01

    A search for a Higgs boson decaying into two photons is described. The analysis is performed using a dataset recorded by the CMS experiment at the LHC from pp collisions at a centre-of-mass energy of 7 TeV, which corresponds to an integrated luminosity of 4.8 inverse femtobarns. Limits are set on the cross section of the standard model Higgs boson decaying to two photons. The expected exclusion limit at 95% confidence level is between 1.4 and 2.4 times the standard model cross section in the mass range between 110 and 150 GeV. The analysis of the data excludes, at 95% confidence level, the standard model Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The largest excess of events above the expected standard model background is observed for a Higgs boson mass hypothesis of 124 GeV with a local significance of 3.1 sigma. The global significance of observing an excess with a local significance greater than 3.1 sigma anywhere in the search range 110-150 GeV is estimated to be 1.8 sigma. More data are required to ascertain the origin of this excess.

  11. Demonstration of a novel technique to measure two-photon exchange effects in elastic e±p scattering

    SciTech Connect (OSTI)

    Moteabbed, Maryam [Florida Institute of Technology; Niroula, Megh [Old Dominion University; Raue, Brian [Florida International University; Weinstein, Lawrence [Old Dominion University

    2013-08-01

    The discrepancy between proton electromagnetic form factors extracted using unpolarized and polarized scattering data is believed to be a consequence of two-photon exchange (TPE) effects. However, the calculations of TPE corrections have significant model dependence, and there is limited direct experimental evidence for such corrections. The TPE contributions depend on the sign of the lepton charge in e±p scattering, but the luminosities of secondary positron beams limited past measurement at large scattering angles, where the TPE effects are believe to be most significant. We present the results of a new experimental technique for making direct e±p comparisons, which has the potential to make precise measurements over a broad range in Q2 and scattering angles. We use the Jefferson Laboratory electron beam and the Hall B photon tagger to generate a clean but untagged photon beam. The photon beam impinges on a converter foil to generate a mixed beam of electrons, positrons, and photons. A chicane is used to separate and recombine the electron and positron beams while the photon beam is stopped by a photon blocker. This provides a combined electron and positron beam, with energies from 0.5 to 3.2 GeV, which impinges on a liquid hydrogen target. The large acceptance CLAS detector is used to identify and reconstruct elastic scattering events, determining both the initial lepton energy and the sign of the scattered lepton. The data were collected in two days with a primary electron beam energy of only 3.3 GeV, limiting the data from this run to smaller values of Q2 and scattering angle. Nonetheless, this measurement yields a data sample for e±p with statistics comparable to those of the best previous measurements. We have shown that we can cleanly identify elastic scattering events and correct for the difference in acceptance for electron and positron scattering. Because we ran with only one polarity for the chicane, we are unable to study the difference between the incoming electron and positron beams. This systematic effect leads to the largest uncertainty in the final ratio of positron to electron scattering: R=1.027±0.005±0.05 for < Q2 >=0.206 GeV2 and 0.830 ? ? ? 0.943. We have demonstrated that the tertiary e± beam generated using this technique provides the opportunity for dramatically improved comparisons of e±p scattering, covering a significant range in both Q2 and scattering angle. Combining data with different chicane polarities will allow for detailed studies of the difference between the incoming e+ and e- beams.

  12. Two-photon induced fabrication of gold microstructures in polystyrene sulfonate thin films using a ruthenium(II) dye as photoinitiator

    SciTech Connect (OSTI)

    Vurth, Laeticia; Baldeck, Patrice; Stephan, Olivier [Laboratoire de Spectrometrie Physique, Universite Joseph Fourier, CNRS (UMR 5588), BP 87, 38402 Saint Martin d'heres Cedex (France); Vitrant, Guy [Institut Microelectronique Electromagnetisme et Photonique, ENSERG-INPG, CNRS (UMR 5130), BP 257, 38016 Grenoble Cedex 1 (France)

    2008-04-28

    Gold microstructures are produced with a femtosecond laser in thin films of a polystyrene sulfonate matrix containing gold ions. Two-photon induced metal reduction is obtained by addition of 0.1 wt % of ruthenium(II)tris(bipyridine) in the formulation. Laser power is reduced to 5 mW, thereby limiting thermal effects. Lines of typically 150 nm heights and 1 {mu}m widths are fabricated as well as freestanding bidimensional structures. An additional electroless plating step produces gold structures with conductivities only ten times smaller than the bulk metal.

  13. Intensive two-photon absorption induced decay pathway in a ZnO crystal: Impact of light-induced defect state

    SciTech Connect (OSTI)

    Li, Zhong-guo; Wei, Tai-Huei; Yang, Jun-yi; Song, Ying-lin; School of Physical Science and Technology, Soochow University, Suzhou 215006

    2013-12-16

    Using the pump-probe with phase object technique with 20 ps laser pulses at 532?nm, we investigated the carrier relaxation process subsequent to two-photon absorption (TPA) in ZnO. As a result, we found that an additional subnanosecond decay pathway is activated when the pump beam intensity surpasses 0.4?GW/cm{sup 2}. We attributed this intensity-dependent pathway to a TPA induced bulk defect state and our results demonstrate that this photo induced defect state has potential applications in ZnO based optoelectronic and spintronic devices.

  14. Producing Turkeys for Show 

    E-Print Network [OSTI]

    Thornberry, Fredrick D.

    2005-12-14

    This publication gives the turkey exhibitor complete instructions for purchasing, feeding, housing and caring for show turkeys. There are also helpful tips for transporting and handling birds....

  15. Post-Show Tips

    Broader source: Energy.gov [DOE]

    These guidelines are designed to help you with the post-show process. This page includes tips for tearing down your exhibit, shipping the exhibit, and collecting your bills.

  16. Analytically expanded and integrated results for massive fermion production in two-photon collisions and a high precision alpha_s determination

    E-Print Network [OSTI]

    B. Kamal; Z. Merebashvili

    1998-06-25

    The cross section for massive fermion production in two-photon collisions was examined at next-to-leading order in QCD/QED for general photon helicity. The delta function (virtual+soft) part of the differential cross section was analytically integrated over the final state phase space. Series expansions for the complete differential and total cross sections were given up to tenth order in the parameter beta. These were shown to be of practical use and revealed much structure. Accurate parametrizations of the total cross sections were given, valid up to higher energies. The above results were applied to top quark production in the region not too far above threshold. The cross section was shown to be quite sensitive to alpha_s in the appropriate energy region.

  17. Enhanced photoluminescence due to two-photon enhanced three-photon absorption in Mn{sup 2+}-doped ZnS quantum dots

    SciTech Connect (OSTI)

    Subha, Radhu [Department of Physics, Indian Institute of Technology, Madras, Chennai, 600036, India and Department of Physics, National University of Singapore (NUS), 2 Science Drive 3, Singapore, 117542 (Singapore); Nalla, Venkatram; Ji, Wei, E-mail: phyjiwei@nus.edu.sg [Department of Physics, National University of Singapore (NUS), 2 Science Drive 3, Singapore, 117542 (Singapore); Feng, Xiaobo [School of Physics and Electronic Information Technology, Yunnan Normal University (China); Vijayan, C. [Department of Physics, Indian Institute of Technology, Madras, Chennai, 600036 (India)

    2014-10-15

    In this work, we have investigated the multi-photon absorption induced photoluminescence in Mn{sup 2+}-doped ZnS quantum dots in the wavelength range 860 – 1050 nm (Near-Infrared Window I). The observed three-photon action cross-section has been compared with the theoretical prediction under four band approximation. An enhancement of four to five orders has been observed in the range from 970 to 1050 nm compared to the theoretical value, which is attributed to two-photon enhanced three-photon absorption. Transient lifetime measurements reveal a lifetime of 0.35 ± 0.3 ms, which is four to five orders higher than other conventional fluorescent probes.

  18. Hide / Show Animal Ethics

    E-Print Network [OSTI]

    New South Wales, University of

    . Administration B. Requested Modification C. Animal Use & Numbers D. Animal Housing E. Animal Location F. Administration B. Requested Modification C. Animal Use & Numbers D. Animal Housing E. Animal Location FHide / Show Animal Ethics Modification for Approved Application You are here: Animal Ethics

  19. Memory effects in quantum channel discrimination

    E-Print Network [OSTI]

    Giulio Chiribella; Giacomo M. D'Ariano; Paolo Perinotti

    2008-04-02

    We consider quantum-memory assisted protocols for discriminating quantum channels. We show that for optimal discrimination of memory channels, memory assisted protocols are needed. This leads to a new notion of distance for channels with memory. For optimal discrimination and estimation of sets of unitary channels memory-assisted protocols are not required.

  20. Comparison of nanosecond and picosecond excitation for interference-free two-photon laser-induced fluorescence detection of atomic hydrogen in flames

    SciTech Connect (OSTI)

    Kulatilaka, Waruna D.; Patterson, Brian D.; Frank, Jonathan H.; Settersten, Thomas B

    2008-09-10

    Two-photon laser-induced fluorescence (TP-LIF) line imaging of atomic hydrogen was investigated in a series of premixed CH4/O2/N2, H2/O2, and H2/O2/N2 flames using excitation with either picosecond or nanosecond pulsed lasers operating at 205 nm. Radial TP-LIF profiles were measured for a range of pulse fluences to determine the maximum interference-free signal levels and the corresponding picosecond and nanosecond laser fluences in each of 12 flames. For an interference-free measurement, the shape of the TP-LIF profile is independent of laser fluence. For larger fluences, distortions in the profile are attributed to photodissociation of H2O, CH3, and/or other combustion intermediates, and stimulated emission. In comparison with the nanosecond laser, excitation with the picosecond laser can effectively reduce the photolytic interference and produces approximately an order of magnitude larger interference-free signal in CH4/O2/N2 flames with equivalence ratios in the range of 0.5{<=}{phi}{<=}1.4, and in H{sub 2}/O{sub 2} flames with 0.3{<=}{phi}{<=}1.2. Although photolytic interference limits the nanosecond laser fluence in all flames, stimulated emission, occurring between the laser-excited level, H(n=3), and H(n=2), is the limiting factor for picosecond excitation in the flames with the highest H atom concentration. Nanosecond excitation is advantageous in the richest ({phi}=1.64) CH4/O2/N2 flame and in H2/O2/N2 flames. The optimal excitation pulse width for interference-free H atom detection depends on the relative concentrations of hydrogen atoms and photolytic precursors, the flame temperature, and the laser path length within the flame.

  1. Chaos in quantum channels

    E-Print Network [OSTI]

    Hosur, Pavan; Roberts, Daniel A; Yoshida, Beni

    2015-01-01

    We study chaos and scrambling in unitary channels by considering their entanglement properties as states. Using out-of-time-order correlation functions to diagnose chaos, we characterize the ability of a channel to process quantum information. We show that the generic decay of such correlators implies that any input subsystem must have near vanishing mutual information with almost all partitions of the output. Additionally, we propose the negativity of the tripartite information of the channel as a general diagnostic of scrambling. This measures the delocalization of information and is closely related to the decay of out-of-time-order correlators. We back up our results with numerics in two non-integrable models and analytic results in a perfect tensor network model of chaotic time evolution. These results show that the butterfly effect in quantum systems implies the information-theoretic definition of scrambling.

  2. Geometric pumping in autophoretic channels

    E-Print Network [OSTI]

    Sebastien Michelin; Thomas D. Montenegro Johnson; Gabriele De Canio; Nicolas Lobato-Dauzier; Eric Lauga

    2015-05-07

    Many microfluidic devices use macroscopic pressure differentials to overcome viscous friction and generate flows in microchannels. In this work, we investigate how the chemical and geometric properties of the channel walls can drive a net flow by exploiting the autophoretic slip flows induced along active walls by local concentration gradients of a solute species. We show that chemical patterning of the wall is not required to generate and control a net flux within the channel, rather channel geometry alone is sufficient. Using numerical simulations, we determine how geometric characteristics of the wall influence channel flow rate, and confirm our results analytically in the asymptotic limit of lubrication theory.

  3. Discovery Channel

    E-Print Network [OSTI]

    Rogers, John A.

    , bendable surfaces -- think electronic ink on flexible displays. Stretchable electronics work like elasticDiscovery Channel :: News :: Electronics Stretch Out http://dsc.discovery.com/news/briefs/20051226/electronics_tec.html 1 of 3 12/27/2005 10:42 PM December 28, 2005 Favorite Fan SitesFavorite Fan Sites

  4. Ion transport through cell membrane channels

    E-Print Network [OSTI]

    Jan Gomulkiewicz; Jacek Miekisz; Stanislaw Miekisz

    2007-06-05

    We discuss various models of ion transport through cell membrane channels. Recent experimental data shows that sizes of ion channels are compared to those of ions and that only few ions may be simultaneously in any single channel. Theoretical description of ion transport in such channels should therefore take into account interactions between ions and between ions and channel proteins. This is not satisfied by macroscopic continuum models based on Poisson-Nernst-Planck equations. More realistic descriptions of ion transport are offered by microscopic Brownian and molecular dynamics. One should also take into account a dynamical character of the channel structure. This is not yet addressed in the literature

  5. PHENOMENOLOGY Wireless Channel Modeling

    E-Print Network [OSTI]

    Giridhar, K.

    PHENOMENOLOGY Wireless Channel Modeling Clarke's, Jakes' and modified Jakes' models Koyalkar Raman? What is channel modeling? Wireless channel modeling Modeling Fading ­ Rayleigh Clarke's, Jakes, they are short ranged, motion restricted. Channel Wired - Single Path - Motion Restricted Wireless - Multipath

  6. Process tomography for unitary quantum channels

    SciTech Connect (OSTI)

    Gutoski, Gus; Johnston, Nathaniel

    2014-03-15

    We study the number of measurements required for quantum process tomography under prior information, such as a promise that the unknown channel is unitary. We introduce the notion of an interactive observable and we show that any unitary channel acting on a d-level quantum system can be uniquely identified among all other channels (unitary or otherwise) with only O(d{sup 2}) interactive observables, as opposed to the O(d{sup 4}) required for tomography of arbitrary channels. This result generalizes to the problem of identifying channels with at most q Kraus operators, and slight improvements can be obtained if we wish to identify such a channel only among unital channels or among other channels with q Kraus operators. These results are proven via explicit construction of large subspaces of Hermitian matrices with various conditions on rank, eigenvalues, and partial trace. Our constructions are built upon various forms of totally nonsingular matrices.

  7. Texas Show Steer Breed Classification 

    E-Print Network [OSTI]

    Cleere, Jason; Mazurkiewicz, Jim; Hammack, Stephen P.

    2008-02-28

    With as many as 16 breeds and breed-cross classes in Texas shows, classifying the breed of a show steer is not always easy. Show steers are sorted into breed classes based on visual characteristics, which is often a matter of judgment...

  8. Excitation-energy dependence of the mechanism for two-photon ionization of liquid H2O and D2O from 8.3to12.4eV

    E-Print Network [OSTI]

    Elles, Christopher G.; Jailaubekov, Askat E.; Crowell, Robert A.; Bradforth, Stephen E.

    2006-07-28

    of hydrogen gas in radioactive waste storage tanks.1 Radiolysis and photolysis experiments pro- vide a window on the underlying chemistry in such systems by revealing information about the important reactions that occur following ionization in a controlled... environment. Each ionization event produces a hydroxyl radical, a hydronium ion, and a solvated electron within the first few picoseconds, as in the case of two-photon ionization. H2O?aq? + 2h?? OH?aq? + H3O ?aq? + + e ?aq? ? . ?1? Although the kinetics...

  9. Single-channel fits and K-matrix constraints

    E-Print Network [OSTI]

    R. L. Workman

    2006-01-10

    A K-matrix formalism is used to relate single-channel and multi-channel fits. We show how the single-channel formalism changes as new hadronic channels become accessible. These relations are compared to those commonly used to fit pseudoscalar meson photoproduction data.

  10. Construction of Channels (Indiana)

    Broader source: Energy.gov [DOE]

    Permission is required from the Natural Resources Commission is required for the construction or alteration of artificial channels or improved channels of natural watercourses that connect to any...

  11. Implications of Channelization and

    E-Print Network [OSTI]

    Gray, Matthew

    · Dams · Highways · Irrigation · Levees · Oilfield Canals · Channelization Reasons for Channelization rare Hatchie River burrowing crayfish · TNC "Last Great Place" list BLH Forests · Structurally diverse

  12. Diarrheal Disease in Show Swine 

    E-Print Network [OSTI]

    Lawhorn, D. Bruce

    2007-02-27

    from the feces of recovered car- rier pigs or from contaminated premises, trailers or scales. Pigs affected with this disease usually become very sick. This organism infects the cells lining the cecum and spiral colon (the same area as whipworms... disease in show pigs. Infection occurs after pigs ingest microscopic whipworm eggs while rooting or eating in a contaminat- ed environment. Whipworm eggs remain viable for as long as 6 years so contaminated premises are an impor- tant source of infection...

  13. Spin injection and spin dynamics at the CuPc/GaAs interface studied with ultraviolet photoemission spectroscopy and two-photon photoemission spectroscopy

    E-Print Network [OSTI]

    Aeschlimann, Martin

    injection via Schottky contacts. Only recently, direct electrical spin injec- tion with organicSpin injection and spin dynamics at the CuPc/GaAs interface studied with ultraviolet photoemission show a highly efficient spin injection of hot electrons from GaAs into CuPc, demonstrating that spin

  14. Entanglement Cost of Quantum Channels

    E-Print Network [OSTI]

    Mario Berta; Fernando Brandao; Matthias Christandl; Stephanie Wehner

    2012-03-23

    The entanglement cost of a quantum channel is the minimal rate at which entanglement (between sender and receiver) is needed in order to simulate many copies of a quantum channel in the presence of free classical communication. In this paper we show how to express this quantity as a regularized optimization of the entanglement formation over states that can be generated between sender and receiver. Our formula is the channel analog of a well-known formula for the entanglement cost of quantum states in terms of the entanglement of formation; and shares a similar relation to the recently shattered hope for additivity. The entanglement cost of a quantum channel can be seen as the analog of the quantum reverse Shannon theorem in the case where free classical communication is allowed. The techniques used in the proof of our result are then also inspired by a recent proof of the quantum reverse Shannon theorem and feature the one-shot formalism for quantum information theory, the post-selection technique for quantum channels as well as von Neumann's minimax theorem. We discuss two applications of our result. First, we are able to link the security in the noisy-storage model to a problem of sending quantum rather than classical information through the adversary's storage device. This not only improves the range of parameters where security can be shown, but also allows us to prove security for storage devices for which no results were known before. Second, our result has consequences for the study of the strong converse quantum capacity. Here, we show that any coding scheme that sends quantum information through a quantum channel at a rate larger than the entanglement cost of the channel has an exponentially small fidelity.

  15. Entanglement Cost of Quantum Channels

    E-Print Network [OSTI]

    Mario Berta; Fernando Brandao; Matthias Christandl; Stephanie Wehner

    2015-11-02

    The entanglement cost of a quantum channel is the minimal rate at which entanglement (between sender and receiver) is needed in order to simulate many copies of a quantum channel in the presence of free classical communication. In this paper we show how to express this quantity as a regularised optimisation of the entanglement formation over states that can be generated between sender and receiver. Our formula is the channel analog of a well-known formula for the entanglement cost of quantum states in terms of the entanglement of formation; and shares a similar relation to the recently shattered hope for additivity. The entanglement cost of a quantum channel can be seen as the analog of the quantum reverse Shannon theorem in the case where free classical communication is allowed. The techniques used in the proof of our result are then also inspired by a recent proof of the quantum reverse Shannon theorem and feature the one-shot formalism for quantum information theory, the post-selection technique for quantum channels as well as Sion's minimax theorem. We discuss two applications of our result. First, we are able to link the security in the noisy-storage model to a problem of sending quantum rather than classical information through the adversary's storage device. This not only improves the range of parameters where security can be shown, but also allows us to prove security for storage devices for which no results were known before. Second, our result has consequences for the study of the strong converse quantum capacity. Here, we show that any coding scheme that sends quantum information through a quantum channel at a rate larger than the entanglement cost of the channel has an exponentially small fidelity.

  16. Search for Dark Matter in Events with Missing Transverse Momentum and a Higgs Boson Decaying to Two Photons in pp Collisions at s?=8 TeV with the ATLAS Detector

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

    Aad, G.

    2015-09-22

    Results of a search for new phenomena in events with large missing transverse momentum and a Higgs boson decaying to two photons are reported. Data from proton-proton collisions at a center-of-mass energy of 8 TeV and corresponding to an integrated luminosity of 20.3 fb-1 have been collected with the ATLAS detector at the LHC. The observed data are well described by the expected standard model backgrounds. Upper limits on the cross section of events with large missing transverse momentum and a Higgs boson candidate are also placed. Exclusion limits are presented for models of physics beyond the standard model featuringmore »dark-matter candidates.« less

  17. Channeling collimation studies at the Fermilab Tevatron

    SciTech Connect (OSTI)

    Carrigan, Richard A.; Drozhdin, Alexandr I.; Fliller, Raymond P., III; Mokhov, Nikolai V.; Shiltsev, Vladimir D.; Still, Dean A.; /Fermilab

    2006-08-01

    Bent crystal channeling has promising advantages for accelerator beam collimation at high energy hadron facilities such as the LHC. This significance has been amplified by several surprising developments including multi-pass channeling and the observation of enhanced deflections over the entire arc of a bent crystal. The second effect has been observed both at RHIC and recently at the Tevatron. Results are reported showing channeling collimation of the circulating proton beam halo at the Tevatron. Parenthetically, this study is the highest energy proton channeling experiment ever carried out. The study is continuing.

  18. Hydrodynamics of vegetated channels

    E-Print Network [OSTI]

    Nepf, Heidi

    This paper highlights some recent trends in vegetation hydrodynamics, focusing on conditions within channels and spanning spatial scales from individual blades, to canopies or vegetation patches, to the channel reach. At ...

  19. Improved Capacity Bounds for the Binary Energy Harvesting Channel

    E-Print Network [OSTI]

    Yener, Aylin

    Improved Capacity Bounds for the Binary Energy Harvesting Channel Kaya Tutuncuoglu1 , Omur Ozel2 the encoder has unit energy storage capacity. We first show that an encoding scheme based on block indexing/channel use. The capacity of additive white Gaussian noise (AWGN) energy harvesting channel was studied in [2

  20. Two-Photon Correlations in Atomic Transitions 

    E-Print Network [OSTI]

    Fry, Edward

    1973-01-01

    .143 0.049 0.037 0.033 0.0 0.0 0.0 0.0 Transition Jg-J-Jy 1/4 5/32 27/400 1957/33 600 -1/5 -1/8 -27/500 -1957/42 000 & (0) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.600 0.405 0.190 0.165 -0.750 -0.429 -0.171 -0.147 1/8 0.333 1... can be easily determined when the states in the transitions have J values 0, 1, 2, 3, 4, l/2, 3/2, 5/2, 7/2, or 9/2, and when the nuclear spin is 0, l, 1/2, 3/2, 5/2, 7/2, or 9/2. Experiments to test hidden-variable theories which are possible...

  1. Channelization architecture for wide-band slow light in atomic vapors

    E-Print Network [OSTI]

    Zachary Dutton; Mark Bashkansky; Michael Steiner; John Reintjes

    2005-10-20

    We propose a ``channelization'' architecture to achieve wide-band electromagnetically induced transparency (EIT) and ultra-slow light propagation in atomic Rb-87 vapors. EIT and slow light are achieved by shining a strong, resonant ``pump'' laser on the atomic medium, which allows slow and unattenuated propagation of a weaker ``signal'' beam, but only when a two-photon resonance condition is satisfied. Our wideband architecture is accomplished by dispersing a wideband signal spatially, transverse to the propagation direction, prior to entering the atomic cell. When particular Zeeman sub-levels are used in the EIT system, then one can introduce a magnetic field with a linear gradient such that the two-photon resonance condition is satisfied for each individual frequency component. Because slow light is a group velocity effect, utilizing differential phase shifts across the spectrum of a light pulse, one must then introduce a slight mismatch from perfect resonance to induce a delay. We present a model which accounts for diffusion of the atoms in the varying magnetic field as well as interaction with levels outside the ideal three-level system on which EIT is based. We find the maximum delay-bandwidth product decreases with bandwidth, and that delay-bandwidth product ~1 should be achievable with bandwidth ~50 MHz (~5 ns delay). This is a large improvement over the ~1 MHz bandwidths in conventional slow light systems and could be of use in signal processing applications.

  2. Fractional channel multichannel analyzer

    DOE Patents [OSTI]

    Brackenbush, L.W.; Anderson, G.A.

    1994-08-23

    A multichannel analyzer incorporating the features of the present invention obtains the effect of fractional channels thus greatly reducing the number of actual channels necessary to record complex line spectra. This is accomplished by using an analog-to-digital converter in the asynchronous mode, i.e., the gate pulse from the pulse height-to-pulse width converter is not synchronized with the signal from a clock oscillator. This saves power and reduces the number of components required on the board to achieve the effect of radically expanding the number of channels without changing the circuit board. 9 figs.

  3. Mechanosensitive Channel Activation by Diffusio-Osmotic Force

    E-Print Network [OSTI]

    Bonthuis, Douwe Jan

    2014-01-01

    For ion channel gating, the appearance of two distinct conformational states and the discrete transitions between them is essential, and therefore of crucial importance to all living organisms. We show that the physical interplay between two structural elements that are commonly present in bacterial mechanosensitive channels, namely a charged vestibule and a hydrophobic constriction, creates two distinct conformational states, open and closed, as well as the gating between them. We solve the nonequilibrium Stokes-Poisson-Nernst-Planck equations, extended to include a molecular potential of mean force, and show that a first order transition between the closed and open states arises naturally from the diffusio-osmotic stress caused by the ions and water inside the channel and the elastic restoring force from the membrane. Our proposed gating mechanism is likely to be important for a broad range of ion channels, as well as for biomimetic channels and ion channel-targeting therapeutics.

  4. Channel plate for DNA sequencing

    DOE Patents [OSTI]

    Douthart, R.J.; Crowell, S.L.

    1998-01-13

    This invention is a channel plate that facilitates data compaction in DNA sequencing. The channel plate has a length, a width and a thickness, and further has a plurality of channels that are parallel. Each channel has a depth partially through the thickness of the channel plate. Additionally an interface edge permits electrical communication across an interface through a buffer to a deposition membrane surface. 15 figs.

  5. MEMS in microfluidic channels.

    SciTech Connect (OSTI)

    Ashby, Carol Iris Hill; Okandan, Murat; Michalske, Terry A.; Sounart, Thomas L.; Matzke, Carolyn M.

    2004-03-01

    Microelectromechanical systems (MEMS) comprise a new class of devices that include various forms of sensors and actuators. Recent studies have shown that microscale cantilever structures are able to detect a wide range of chemicals, biomolecules or even single bacterial cells. In this approach, cantilever deflection replaces optical fluorescence detection thereby eliminating complex chemical tagging steps that are difficult to achieve with chip-based architectures. A key challenge to utilizing this new detection scheme is the incorporation of functionalized MEMS structures within complex microfluidic channel architectures. The ability to accomplish this integration is currently limited by the processing approaches used to seal lids on pre-etched microfluidic channels. This report describes Sandia's first construction of MEMS instrumented microfluidic chips, which were fabricated by combining our leading capabilities in MEMS processing with our low-temperature photolithographic method for fabricating microfluidic channels. We have explored in-situ cantilevers and other similar passive MEMS devices as a new approach to directly sense fluid transport, and have successfully monitored local flow rates and viscosities within microfluidic channels. Actuated MEMS structures have also been incorporated into microfluidic channels, and the electrical requirements for actuation in liquids have been quantified with an elegant theory. Electrostatic actuation in water has been accomplished, and a novel technique for monitoring local electrical conductivities has been invented.

  6. Entanglement-Saving Channels

    E-Print Network [OSTI]

    Ludovico Lami; Vittorio Giovannetti

    2015-05-03

    The set of Entanglement Saving (ES) quantum channels is introduced and characterized. These are completely positive, trace preserving transformations which when acting locally on a bipartite quantum system initially prepared into a maximally entangled configuration, preserve its entanglement even when applied an arbitrary number of times. In other words, a quantum channel $\\psi$ is said to be ES if its powers $\\psi^n$ are not entanglement-breaking for all integers $n$. We also characterize the properties of the Asymptotic Entanglement Saving (AES) maps. These form a proper subset of the ES channels that is constituted by those maps which, not only preserve entanglement for all finite $n$, but which also sustain an explicitly not null level of entanglement in the asymptotic limit~$n\\rightarrow \\infty$. Structure theorems are provided for ES and for AES maps which yield an almost complete characterization of the former and a full characterization of the latter.

  7. Hybrid Zero-capacity Channels

    E-Print Network [OSTI]

    Sergii Strelchuk; Jonathan Oppenheim

    2012-07-04

    There are only two known kinds of zero-capacity channels. The first kind produces entangled states that have positive partial transpose, and the second one - states that are cloneable. We consider the family of 'hybrid' quantum channels, which lies in the intersection of the above classes of channels and investigate its properties. It gives rise to the first explicit examples of the channels, which create bound entangled states that have the property of being cloneable to the arbitrary finite number of parties. Hybrid channels provide the first example of highly cloneable binding entanglement channels, for which known superactivation protocols must fail - superactivation is the effect where two channels each with zero quantum capacity having positive capacity when used together. We give two methods to construct a hybrid channel from any binding entanglement channel. We also find the low-dimensional counterparts of hybrid states - bipartite qubit states which are extendible and possess two-way key.

  8. Analysis of realistic ultrawideband indoor communication channels by using an efficient ray-tracing based method

    E-Print Network [OSTI]

    Malik, Wasim Q.

    A fundamental step in ultrawideband (UWB) communication system design involves the characterization of the indoor propagation channel. In this paper, we show that the UWB propagation channel parameters can be accurately ...

  9. Combined performance of coding and equalization for data transmitted over a fading channel 

    E-Print Network [OSTI]

    Inayatullah, Azfar

    1997-01-01

    of a RF channel is an improvement over the software based simulation because the processes of modulation, demodulation and channel simulation are done in hardware instead of software. Moreover, the BER curves show that equalization carried out...

  10. Developments in relativistic channeling

    SciTech Connect (OSTI)

    Carrigan, R.A. Jr.

    1996-10-01

    The possibility of using channeling as a tool for high energy accelerator applications and particle physics has now been extensively investigated. Bent crystals have been used for accelerator extraction and for particle deflection. Applications as accelerating devices have been discussed but have not yet been tried. 61 refs., 1 fig.

  11. Developments in relativistic channeling

    SciTech Connect (OSTI)

    Carrigan, R.A. Jr.

    1997-03-01

    The possibility of using channeling as a tool for high energy accelerator applications and particle physics has now been extensively investigated. Bent crystals have been used for accelerator extraction and for particle deflection. Applications as accelerating devices have been discussed but have not yet been tried. {copyright} {ital 1997 American Institute of Physics.}

  12. Getting the Most Out of a Show

    Broader source: Energy.gov [DOE]

    These guidelines are designed to assist you during the event, in order to get the most out of the showing of your exhibit.

  13. ZEBRAlliance Research Project Shows Promising Results | ORNL

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

    Tennessee homes built with the goal of decreasing the cost of residential ground-source heat pump installation. The project's goal is to show consumers how affordable and...

  14. Conductive Channel for Energy Transmission

    SciTech Connect (OSTI)

    Apollonov, Victor V. [A.M. Prokhorov General Physics Institute, Vavilov Str. 38, Moscow, 119991 (Russian Federation)

    2011-11-10

    For many years the attempts to create conductive channels of big length were taken in order to study the upper atmosphere and to settle special tasks, related to energy transmission. There upon the program of creation of 'Impulsar' represents a great interest, as this program in a combination with high-voltage high repetition rate electrical source can be useful to solve the above mentioned problems (N. Tesla ideas for the days of high power lasers). The principle of conductive channel production can be shortly described as follows. The 'Impulsar' - laser jet engine vehicle - propulsion take place under the influence of powerful high repetition rate pulse-periodic laser radiation. In the experiments the CO{sub 2}-laser and solid state Nd:YAG laser systems had been used. Active impulse appears thanks to air breakdown (<30 km) or to the breakdown of ablated material on the board (>30 km), placed in the vicinity of the focusing mirror-acceptor of the breakdown waves. With each pulse of powerful laser the device rises up, leaving a bright and dense trace of products with high degree of ionization and metallization by conductive nano-particles due to ablation. Conductive dust plasma properties investigation in our experiments was produced by two very effective approaches: high power laser controlled ablation and by explosion of wire. Experimental and theoretical results of conductive canal modeling will be presented. The estimations show that with already experimentally demonstrated figures of specific thrust impulse the lower layers of the Ionosphere can be reached in several ten seconds that is enough to keep the high level of channel conductivity and stability with the help of high repetition rate high voltage generator. Some possible applications for new technology are highlighted.

  15. Radar channel balancing with commutation

    SciTech Connect (OSTI)

    Doerry, Armin Walter

    2014-02-01

    When multiple channels are employed in a pulse-Doppler radar, achieving and maintaining balance between the channels is problematic. In some circumstances the channels may be commutated to achieve adequate balance. Commutation is the switching, trading, toggling, or multiplexing of the channels between signal paths. Commutation allows modulating the imbalance energy away from the balanced energy in Doppler, where it can be mitigated with filtering.

  16. Micro-channel plate detector

    SciTech Connect (OSTI)

    Elam, Jeffrey W.; Lee, Seon W.; Wang, Hsien -Hau; Pellin, Michael J.; Byrum, Karen; Frisch, Henry J.

    2015-09-22

    A method and system for providing a micro-channel plate detector. An anodized aluminum oxide membrane is provided and includes a plurality of nanopores which have an Al coating and a thin layer of an emissive oxide material responsive to incident radiation, thereby providing a plurality of radiation sensitive channels for the micro-channel plate detector.

  17. Dangerous Bodies: Freak Shows, Expression, and Exploitation

    E-Print Network [OSTI]

    Fordham, Brigham A.

    2007-01-01

    Dangerous Bodies: Freak Shows, Expression, and ExploitationR.I. GEN. LAWS § 11-9-1. DANGEROUS BODIES Rhode Island does161 Id. Id. 165 id. 166 Id. DANGEROUS BODIES This argument

  18. Incident Response Planning for Selected Livestock Shows 

    E-Print Network [OSTI]

    Tomascik, Chelsea Roxanne

    2012-02-14

    Incidents affecting the livestock industry are unavoidable in today's society. These incidents can happen at livestock shows across the country putting thousands of exhibitors, visitors, employees and livestock in danger. The purpose of this study...

  19. Athermal channeled spectropolarimeter

    DOE Patents [OSTI]

    Jones, Julia Craven

    2015-12-08

    A temperature insensitive (athermal) channeled spectropolarimeter (CSP) is described. The athermal CSP includes a crystal retarder formed of a biaxial crystal. The crystal retarder has three crystal axes, wherein each axis has its own distinct index of refraction. The axes are oriented in a particular manner, causing an amplitude modulating carrier frequency induced by the crystal retarder to be thermally invariant. Accordingly, a calibration beam technique can be used over a relatively wide range of ambient temperatures, with a common calibration data set.

  20. Coding along hermite polynomials for gaussian noise channels

    E-Print Network [OSTI]

    Abbe, Emmanuel A.

    This paper shows that the capacity achieving input distribution for a fading Gaussian broadcast channel is not Gaussian in general. The construction of non-Gaussian distributions that strictly outperform Gaussian ones, for ...

  1. Multilevel trellis coded modulation for the fading channel 

    E-Print Network [OSTI]

    Tung, Chien-Cheng

    1993-01-01

    Trellis coded modulation (TCM) has been applied to the fading channel recently [11-[3]. Among these articles, Divsalar and Simon showed in their papers that the length of the shortest error path and the product of the ...

  2. Diversity and distribution of bacterial communities in dioxin-contaminated sediments from the Houston ship channel 

    E-Print Network [OSTI]

    Hieke, Anne-Sophie Charlotte

    2009-05-15

    ......................................................................................... 17 7 1% agarose gel image showing the PCR results of samples amplified with bacterium-specific primers ......................................................................... 31 8 1% agarose gel image showing the PCR results of samples... amplified with Dehalococcoides-specific primers ............................................................. 32 9 Map of Galveston Bay, TX, showing the Houston Ship Channel .............. 49 10 Map of Sabine Lake, TX, showing the ship channel...

  3. Static virtual channel allocation in oblivious routing

    E-Print Network [OSTI]

    Shim, Keun Sup

    Most virtual channel routers have multiple virtual channels to mitigate the effects of head-of-line blocking. When there are more flows than virtual channels at a link, packets or flows must compete for channels, either ...

  4. Martinkus docos show reality of Afghanistan war

    E-Print Network [OSTI]

    Wapstra, Erik

    Martinkus docos show reality of Afghanistan war By ShAron Webb Journalist John Martinkus reels off the date he was kidnapped in the Iraq war as if it's perma- nently scratched on his brain. "It happened. It was terrible. I thought: Here we go." It's experiences like this that gave credibility to the television war

  5. Capacity Theorems for Relay Channels with ISI Ninoslav Marina, Aleksandar Kavcic and N. Thomas Gaarder

    E-Print Network [OSTI]

    Kavcic, Aleksandar

    Capacity Theorems for Relay Channels with ISI Ninoslav Marina, Aleksandar Kavci´c and N. Thomas-length intersymbol interference (ISI). For such channels, we show that the decode-and-forward strategy achieves the destination node to the relay node is an instance of a degraded relay channel with ISI, and observe

  6. Sensitivity of Gaussian Channel Capacity and ate-Distortion Function to nonGaussian Contamination

    E-Print Network [OSTI]

    Verdú, Sergio

    Sensitivity of Gaussian Channel Capacity and ate-Distortion Function to nonGaussian Contamination-Gaussian contaminating noise. Although the ca- pacity of such channels cannot be evaluated in general, we analyze the decrease in capacity, or sensitivity of the channel capacity to the weak contaminating noise. We show

  7. Indexes for selected equipment show moderate increase

    SciTech Connect (OSTI)

    Farrar, G.

    1997-04-07

    Costs for six selected equipment items used in refining construction operations have been surveyed for the 3 years, 1994--1996. The accompanying table shows Nelson-Farrar equipment indexes for these items of equipment. The six categories of equipment tracked are bubble trays, fractionating towers, tube stills, valves and fittings, tanks and pressure vessels, and non-metallic building materials. Tables also present data on operating costs for materials, labor, and equipment.

  8. Channel | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmentalBowerbank,CammackFLIR Jump to:RAPIDCavalloCerionChannahon, Illinois: EnergyChannel

  9. Show Me Ethanol LLC | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmental Jump to:EA EIS ReportEurope GmbH Jump to: navigation,Show Me Ethanol LLC Jump to:

  10. Roderick MacKinnon and Ion Channels - Potassium Channels and...

    Office of Scientific and Technical Information (OSTI)

    in Its Natural Habitat Visualizing a Potassium Channel Top National Institutes of Health Grantees Win 2003 Nobel Prize for Chemistry Interview with Roderick MacKinnon, Lasker...

  11. Planar channeling and quasichanneling oscillations in a bent crystal

    E-Print Network [OSTI]

    Sytov, A I; Bandiera, L; Germogli, G; Guidi, V; Mazzolari, A; Tikhomirov, V V

    2015-01-01

    Particles passing through a crystal under planar channeling experience transverse oscillations in their motion. As channeled particles approach the atomic planes of a crystal, they are likely to be dechanneled. This effect was used in ion-beam analysis with MeV energy. We studied this effect in a bent crystal for positive and negative particles within a wide range of energies in sight of application of such crystals at accelerators. We found the conditions for the appearance or not of channeling oscillations. Indeed a new kind of oscillations, strictly related to the motion of over-barrier particles, i.e. quasichanneling particles, has been predicted. Such oscillations, named planar quasichanneling oscillations, possess a different nature than channeling oscillations. Through computer simulation, we studied this effect and provided a theoretical interpretation for them. We show that channeling oscillations can be observed only for positive particles while quasichanneling oscillations can exist for particles w...

  12. Premixed Flame Dynamics in Narrow 2D Channels

    E-Print Network [OSTI]

    Ayoobi, Mohsen

    2015-01-01

    Premixed flames propagating within small channels show complex combustion phenomena that differ from flame propagation at conventional scales. Available experimental and numerical studies have documented stationary/non-stationary and/or asymmetric modes that depend on properties of the incoming reactant flow as well as channel geometry and wall temperatures. The present work seeks to illuminate mechanisms leading to symmetry-breaking and limit cycle behavior that are fundamental to these combustion modes. Specifically, four cases of lean premixed methane/air combustion -- two equivalence ratios (0.53 and 0.7) and two channel widths (2 and 5mm) -- are investigated in a 2D configuration with constant channel length and bulk inlet velocity, where numerical simulations are performed using detailed chemistry. External wall heating is simulated by imposing a linear temperature gradient as a boundary condition on both walls. In the 2mm-channel, both equivalence ratios produce flames that stabilize with symmetric fla...

  13. Powerline Communications Channel Modelling Methodology Based on Statistical Features

    E-Print Network [OSTI]

    Tan, Bo

    2012-01-01

    This paper proposes a new channel modelling method for powerline communications networks based on the multipath profile in the time domain. The new channel model is developed to be applied in a range of Powerline Communications (PLC) research topics such as impulse noise modelling, deployment and coverage studies, and communications theory analysis. To develop the methodology, channels are categorised according to their propagation distance and power delay profile. The statistical multipath parameters such as path arrival time, magnitude and interval for each category are analyzed to build the model. Each generated channel based on the proposed statistical model represents a different realisation of a PLC network. Simulation results in similar the time and frequency domains show that the proposed statistical modelling method, which integrates the impact of network topology presents the PLC channel features as the underlying transmission line theory model. Furthermore, two potential application scenarios are d...

  14. Control power in perfect controlled teleportation via partially entangled channels

    E-Print Network [OSTI]

    Xi-Han Li; Shohini Ghose

    2014-10-05

    We analyze and evaluate perfect controlled teleportation via three-qubit entangled channels from the point of view of the controller. The key idea in controlled teleportation is that the teleportation is performed only with the participation of the controller. We calculate a quantitative measure of the controller's power and establish a lower bound on the control power required for controlled teleportation. We show that the maximally entangled GHZ state is a suitable channel for controlled teleportation of arbitrary single qubits - the controller's power meets the bound and the teleportation fidelity without the controller's permission is no better than the fidelity of a classical channel. We also construct partially entangled channels that exceed the bound for controlled teleportation of a restricted set of states called the equatorial states. We calculate the minimum entanglement required in these channels to exceed the bound. Moreover, we find that in these restricted controlled teleportation schemes, the partially entangled channels can outperform maximally entangled channels with respect to the controller's power. Our results provide a new perspective on controlled teleportation schemes and are of practical interest since we propose useful partially entangled channels.

  15. Mirrored serpentine flow channels for fuel cell

    DOE Patents [OSTI]

    Rock, Jeffrey Allan (Rochester, NY)

    2000-08-08

    A PEM fuel cell having serpentine flow field channels wherein the input/inlet legs of each channel border the input/inlet legs of the next adjacent channels in the same flow field, and the output/exit legs of each channel border the output/exit legs of the next adjacent channels in the same flow field. The serpentine fuel flow channels may be longer, and may contain more medial legs, than the serpentine oxidant flow channels.

  16. Negative particle planar and axial channeling and channeling collimation

    SciTech Connect (OSTI)

    Carrigan, Richard A., Jr.; /Fermilab

    2009-12-01

    While information exists on high energy negative particle channeling there has been little study of the challenges of negative particle bending and channeling collimation. Partly this is because negative dechanneling lengths are relatively much shorter. Electrons are not particularly useful for investigating negative particle channeling effects because their material interactions are dominated by channeling radiation. Another important factor is that the current central challenge in channeling collimation is the proton-proton Large Hadron Collider (LHC) where both beams are positive. On the other hand in the future the collimation question might reemerge for electon-positron or muon colliders. Dechanneling lengths increase at higher energies so that part of the negative particle experimental challenge diminishes. In the article different approaches to determining negative dechanneling lengths are reviewed. The more complicated case for axial channeling is also discussed. Muon channeling as a tool to investigate dechanneling is also discussed. While it is now possible to study muon channeling it will probably not illuminate the study of negative dechanneling.

  17. Gating-by-tilt of mechanosensitive membrane channels

    E-Print Network [OSTI]

    Matthew S. Turner; Pierre Sens

    2003-11-25

    We propose an alternative mechanism for the gating of biological membrane channels in response to membrane tension that involves a change in the slope of the membrane near the channel. Under biological membrane tensions we show that the energy difference between the closed (tilted) and open (untilted) states can far exceed kBT and is comparable to what is available under simple ilational gating. Recent experiments demonstrate that membrane leaflet asymmetries (spontaneous curvature) can strong effect the gating of some channels. Such a phenomenon would be more easy to explain under gating-by-tilt, given its novel intrinsic sensitivity to such asymmetry.

  18. Controlled remote state preparation via partially entangled quantum channel

    E-Print Network [OSTI]

    Chun Wang; Zhi Zeng; Xi-Han Li

    2014-12-30

    We propose two controlled remote state preparation protocols via partially entangled channels. One prepares a single-qubit state and the other prepares a two-qubit state. Different from other controlled remote state preparation schemes which also utilize partially entangled channels, neither auxiliary qubits nor two-qubit unitary transformations are required in our schemes and the success probabilities are independent of the coefficients of the quantum channel. The success probabilities are 50% and 25% for arbitrary single-qubit states and two-qubit states, respectively. We also show that the success probabilities can reach 100% for restricted classes of states.

  19. Channeling of intense laser beams in underdense plasmas

    SciTech Connect (OSTI)

    Feit, M.D.; Garrison, J.C.; Rubenchik, A.M.

    1997-09-01

    A hydrodynamic simulation is used to show that intense laser pulses propagating in underdense plasmas create stable, long-lived, and completely evacuated channels. At low intensities, I=10{sup 17} W/cm{sup 2}, self focusing seriously distorts the temporal envelope of the pulse, but channeling still occurs. At high intensities, I=10{sup 19} W/cm{sup 2}, channeling can proceed over many diffraction lengths with significant distortion restricted to the leading edge of the pulse. {copyright} {ital 1997} {ital The American Physical Society}

  20. Muon Cooling Channels Eberhard Keil

    E-Print Network [OSTI]

    Keil, Eberhard

    Muon Cooling Channels Eberhard Keil Katharinenstr. 17, DE-10711 Berlin, Germany Abstract Parameters of muon cooling channels are discussed that achieve cooling of a muon beam from initial to final emittances in all three degrees of freedom in a given length. Published theories of ionisation cooling yield

  1. Information geometry of Gaussian channels

    SciTech Connect (OSTI)

    Monras, Alex; Illuminati, Fabrizio

    2010-06-15

    We define a local Riemannian metric tensor in the manifold of Gaussian channels and the distance that it induces. We adopt an information-geometric approach and define a metric derived from the Bures-Fisher metric for quantum states. The resulting metric inherits several desirable properties from the Bures-Fisher metric and is operationally motivated by distinguishability considerations: It serves as an upper bound to the attainable quantum Fisher information for the channel parameters using Gaussian states, under generic constraints on the physically available resources. Our approach naturally includes the use of entangled Gaussian probe states. We prove that the metric enjoys some desirable properties like stability and covariance. As a by-product, we also obtain some general results in Gaussian channel estimation that are the continuous-variable analogs of previously known results in finite dimensions. We prove that optimal probe states are always pure and bounded in the number of ancillary modes, even in the presence of constraints on the reduced state input in the channel. This has experimental and computational implications. It limits the complexity of optimal experimental setups for channel estimation and reduces the computational requirements for the evaluation of the metric: Indeed, we construct a converging algorithm for its computation. We provide explicit formulas for computing the multiparametric quantum Fisher information for dissipative channels probed with arbitrary Gaussian states and provide the optimal observables for the estimation of the channel parameters (e.g., bath couplings, squeezing, and temperature).

  2. Superconducting solenoids for the MICE channel

    E-Print Network [OSTI]

    2003-01-01

    IEEE Transactions on Applied Superconductivity 13, No. 2 S.SUPERCONDUCTING SOLENOIDS FOR THE MICE CHANNEL* M. A. Green,describes the channel of superconducting solenoids for the

  3. PARTICLE ACCELERATORS; ACCELERATORS; BEAM DUMPS; BENDING; CHANNELING...

    Office of Scientific and Technical Information (OSTI)

    Channeling through Bent Crystals Mack, Stephanie; Ottawa U. SLAC 43 PARTICLE ACCELERATORS; ACCELERATORS; BEAM DUMPS; BENDING; CHANNELING; CRYSTAL LATTICES; DETECTION; FORTRAN;...

  4. Interference Channel with State Information 

    E-Print Network [OSTI]

    Zhang, Lili

    2012-10-19

    In this dissertation, we study the state-dependent two-user interference channel, where the state information is non-causally known at both transmitters but unknown to either of the receivers. We first propose two coding ...

  5. The "Z" Channel Sriram Vishwanath

    E-Print Network [OSTI]

    Minnesota, University of

    The "Z" Channel Sriram Vishwanath Dept. of Elec. and Computer Engg. Univ. of Texas at Austin, Austin, TX E-mail : sriram@ece.utexas.edu Nihar Jindal Department of Electrical Engineering Stanford

  6. On sounding in wideband channels

    E-Print Network [OSTI]

    Jing, Sheng, Ph. D. Massachusetts Institute of Technology

    2006-01-01

    (cont.) This approach provides us with a cohesive framework to consider the relative costs and benefits of allotting energy for sounding versus transmission, and for repeated sounding of a single channel versus sounding ...

  7. TRANSIENT BRIGHTENINGS ASSOCIATED WITH FLUX CANCELLATION ALONG A FILAMENT CHANNEL

    SciTech Connect (OSTI)

    Wang, Y.-M.; Muglach, K. E-mail: karin.muglach@nasa.gov

    2013-02-15

    Filament channels coincide with large-scale polarity inversion lines of the photospheric magnetic field, where flux cancellation continually takes place. High-cadence Solar Dynamics Observatory (SDO) images recorded in He II 30.4 nm and Fe IX 17.1 nm during 2010 August 22 reveal numerous transient brightenings occurring along the edge of a filament channel within a decaying active region, where SDO line-of-sight magnetograms show strong opposite-polarity flux in close contact. The brightenings are elongated along the direction of the filament channel, with linear extents of several arcseconds, and typically last a few minutes; they sometimes have the form of multiple two-sided ejections with speeds on the order of 100 km s{sup -1}. Remarkably, some of the brightenings rapidly develop into larger scale events, forming sheetlike structures that are eventually torn apart by the diverging flows in the filament channel and ejected in opposite directions. We interpret the brightenings as resulting from reconnections among filament-channel field lines having one footpoint located in the region of canceling flux. In some cases, the flow patterns that develop in the channel may bring successive horizontal loops together and cause a cascade to larger scales.

  8. Wiretap Channel II with a Noisy Main Channel Mohamed Nafea and Aylin Yener

    E-Print Network [OSTI]

    Yener, Aylin

    Wiretap Channel II with a Noisy Main Channel Mohamed Nafea and Aylin Yener Wireless Communications increases. This generalizes the wiretap II model to one with a noisy main channel. I. INTRODUCTION Wyner a discrete memoryless channel (DMC), referred to as the main channel, and an external eavesdropper (Eve

  9. Ceramic membranes having macroscopic channels

    DOE Patents [OSTI]

    Anderson, Marc A. (Madison, WI); Peterson, Reid A. (Madison, WI)

    1996-01-01

    Methods have been developed to make porous ceramic membranes having macroscopic channels therethrough. The novel membranes are formed by temporarily supporting the sol-gel membrane precursor on an organic support which is ultimately removed from the interior of the membrane, preferably by pyrolysis or by chemical destruction. The organic support may also include an inorganic metal portion that remains on destruction of the organic portion, providing structural support and/or chemical reactivity to the membrane. The channels formed when the organic support is destroyed provide the ability to withdraw small catalytic products or size-separated molecules from the metal oxide membrane. In addition, the channel-containing membranes retain all of the advantages of existing porous ceramic membranes.

  10. Two-Photon-Coincidence Fluorescence Spectra of Cavity Multipolaritons: Novel

    E-Print Network [OSTI]

    Mukamel, Shaul

    - tiexcitons) upon absorption of a single photon and can thus enhance the efficiency of solar cells's may reduce the QY. In contrast, some recent TF spectroscopy experiments performed on CdSe and Cd

  11. Discovery of the Higgs Boson Decaying to Two Photons /

    E-Print Network [OSTI]

    Palmer, Christopher Allan

    2014-01-01

    2 Standard Model and the Higgs Boson . . . . . . . . . . .Second Higgs Boson Search . . . . . . . . . . . . . . . .CMS combined SM Higgs boson search exclusion limits with

  12. Two-photon production of charged pion and kaon pairs

    E-Print Network [OSTI]

    Baringer, Philip S.

    1994-09-01

    I calorimeter in conjunction with the muon chamber system. The reported cross section is compared with leading order QCD models as well as previous experiments. Although the functional dependence of the measured cross section disagrees with leading order QCD...

  13. Techniques in two-photon microscopy for neuroscience

    E-Print Network [OSTI]

    Driscoll, Jonathan Daniel

    2011-01-01

    flow in that vessel. Laminar fluid flow in a pipe, which isIn laminar flow, the velocity v(r) of the fluid through the

  14. Supporting Information Characterization of Microstructures Fabricated by Two-Photon

    E-Print Network [OSTI]

    Potma, Eric Olaf

    92697 *Corresponding author. Email:tommaso.baldacchini@newport.com #12;2 S1. CARS microscopy are contaminants deposited during the sputtering process required to coat the sample with a thin film of gold sample was investigated by CARS microscopy. The Stokes and pump beams were set at 1064 nm and 813 nm

  15. TwoPhoton Absorption (TPA) Liquid Crystal Institute

    E-Print Network [OSTI]

    Palffy-Muhoray, Peter

    written structures with a complicated material recipe. a A 3D spiral structure within silver-doped sol demonstrated twophoton photopolymerization to make 3D spiral structures #12; Introduction TPA microscopy Pinhole All dye along laser path are excited UV light Optical sectioning, 3D imaging, laser

  16. Tunable structures comprising two photonic crystal slabs optical study in

    E-Print Network [OSTI]

    Peter, Yves-Alain

    Department, Ecole Polytechnique de Montr´eal, Montr´eal (QC) H3C 3A7, Canada yves peak. Finally, we investigate the electromagnetic energy distributions at the wavelength

  17. 3D two-photon lithographic microfabrication system

    SciTech Connect (OSTI)

    Kim, Daekeun (Cambridge, MA); So, Peter T. C. (Boston, MA)

    2011-03-08

    An imaging system is provided that includes a optical pulse generator for providing an optical pulse having a spectral bandwidth and includes monochromatic waves having different wavelengths. A dispersive element receives a second optical pulse associated with the optical pulse and disperses the second optical pulse at different angles on the surface of the dispersive element depending on wavelength. One or more focal elements receives the dispersed second optical pulse produced on the dispersive element. The one or more focal element recombine the dispersed second optical pulse at a focal plane on a specimen where the width of the optical pulse is restored at the focal plane.

  18. EMERGING TECHNOLOGIES Two-photon excitation chlorophyll fluorescence lifetime imaging

    E-Print Network [OSTI]

    Qu, Jianan

    at higher Cd concentration was clearly identified. The decay of chlorophyll fluorescence extracted from) toxicity Abbreviations Cd Cadmium PS Photosystem LHCII Light-harvesting complex II PAM Pulse and Computer Engineering, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon

  19. Diffraction in Two-Photon Collisions at TESLA

    E-Print Network [OSTI]

    A. De Roeck; R. Engel; A. Rostovtsev

    1997-10-15

    In this article we discuss the possibility to measure diffraction dissociation in collisions of real and weakly virtual photons at a 500 GeV e+e- linear collider.

  20. Size Dependence of Two-Photon Absorption in Semiconductor Quantum...

    Office of Scientific and Technical Information (OSTI)

    absorption spectroscopy by probing the pump-induced bleaching at the first exciton transition energy. was also calculated using a model based on the multiband...

  1. 6 Equalization of Channels with ISI Many practical channels are bandlimited and linearly distort the

    E-Print Network [OSTI]

    Pulfrey, David L.

    244 6 Equalization of Channels with ISI Many practical channels are bandlimited and linearly distort the transmit signal. In this case, the resulting ISI channel has to be equalized for reliable

  2. Conductance of ion channels and nanopores with charged walls: a toy model

    E-Print Network [OSTI]

    J. Zhang; A. Kamenev; B. I. Shklovskii

    2005-06-14

    We consider ion transport through protein ion channels in lipid membranes and water-filled nanopores in silicon films. It is known that, due to the large ratio of dielectric constants of water and the surrounding material, an ion placed inside the channel faces a large electrostatic self-energy barrier. The barrier leads to an exponentially large resistance of the channel. We study reduction of the electrostatic barrier by immobile charges located on the internal walls of the channel. We show that the barrier practically vanishes already at relatively small concentration of wall charges.

  3. Restoration of Abandoned ChannelsRestoration of Abandoned Channels Prepared for KICT, South Korea

    E-Print Network [OSTI]

    Julien, Pierre Y.

    lake Adding Water from Power Plant Increase flow depth Riparian Buffer Prevent channel migration BMPs. · Neck cutoffs ­ Lateral migration increases sinuosity of the channel until two bends connect

  4. EIGHT CHANNEL PROGRAMMABLE PULSE GENERATOR

    E-Print Network [OSTI]

    Kleinfeld, David

    Master-8 EIGHT CHANNEL PROGRAMMABLE PULSE GENERATOR Operation Manual A.M.P.I. A.M.P.I. 123Uzlel St and the programming simple and easy to learn. Master-8 is an attractive unit and you will enjoy working with its eight -- Modes of operation 11 -- Setting the parameters 13 -- Triggering 14 -- Eight stored paradigms 14

  5. Gating Currents from Kv7 Channels Carrying Neuronal Hyperexcitability Mutations in the Voltage-Sensing Domain

    E-Print Network [OSTI]

    Bezanilla, Francisco

    unable to provide a detailed assessment of the structural rearrangements underlying channel gating.2 channels both functionally and structurally, were used for these experiments. The data obtained showed activation of gating-pore currents at depolarized potentials. These results reveal that distinct molecular

  6. Outage Capacity of the Fading Relay Channel in the Low SNR Regime

    E-Print Network [OSTI]

    Tse, David

    Outage Capacity of the Fading Relay Channel in the Low SNR Regime A. Salman Avestimehr and David N at the outage capacity of the fading relay channel with half-duplex constraint in the low SNR regime. First we. In this case we show that a Bursty Amplify-Forward (BAF) protocol is optimal and achieves the outage capacity

  7. Capacity of the Energy Harvesting Channel with Energy Arrival Information at the Receiver

    E-Print Network [OSTI]

    Yener, Aylin

    Capacity of the Energy Harvesting Channel with Energy Arrival Information at the Receiver Omur Ozel- pacity is invariant to the non-causal knowledge of energy arrivals. Finally, we show that the capacity the battery energy at the transmitter is independent of the message. The capacity of this channel with only

  8. Shear Stress in Smooth Rectangular Open-Channel Flows and Pierre Y. Julien2

    E-Print Network [OSTI]

    Julien, Pierre Y.

    Shear Stress in Smooth Rectangular Open-Channel Flows Junke Guo1 and Pierre Y. Julien2 Abstract: The average bed and sidewall shear stresses in smooth rectangular open-channel flows are determined after solving the continuity and momentum equations. The analysis shows that the shear stresses are function

  9. Study Shows Significant Economic Impact from Recovery Act | Department...

    Office of Environmental Management (EM)

    Study Shows Significant Economic Impact from Recovery Act Study Shows Significant Economic Impact from Recovery Act A study recently released shows the 1.6 billion the Savannah...

  10. Notes on Deterministic Programming of Quantum Observables and Channels

    E-Print Network [OSTI]

    Teiko Heinosaari; Mikko Tukiainen

    2015-05-13

    We study the limitations of deterministic programmability of quantum circuits, e.g., quantum computer. More precisely, we analyse the programming of quantum observables and channels via quantum multimeters. We show that the programming vectors for any two different sharp observables are necessarily orthogonal, whenever post-processing is not allowed. This result then directly implies that also any two different unitary channels require orthogonal programming vectors. This approach generalizes the well-known orthogonality result first proven by Nielsen and Chuang. In addition, we give size-bounds for a multimeter to be efficient in quantum programming.

  11. Volume III, Chapter 9 Channel Catfish

    E-Print Network [OSTI]

    Volume III, Chapter 9 Channel Catfish #12;TABLE OF CONTENTS 9.0 Channel Catfish (Ictalurus................................................................................................... 9-6 9.4.3 Water Development.............................................................................................. 9-6 9.4.4 Water Quality

  12. Analysis of Crystal Lattice Deformation by Ion Channeling

    SciTech Connect (OSTI)

    Jozwik, Przemyslaw A.; Sathish, N.; Nowicki, L.; Jagielski, Jacek; Turos, Andrzej W.; Kovarik, Libor; Arey, Bruce W.; Shutthanandan, V.; Jiang, Weilin; Dyczewski, J.; Barcz, A.

    2013-05-01

    A model of dislocations has been developed for the use in Monte Carlo simulations of ion channeling spectra obtained for defected crystals. High resolution transmission electron microscopy micrographs show that the dominant type of defects in the majority of ion irradiated crystals are dislocations. The RBS/channeling spectrum is then composed of two components: one is due to direct scattering on randomly displaced atoms and the second one is related to beam defocussing on dislocations, which produce predominantly crystal lattice distortions, i.e. bent channels. In order to provide a correct analysis of backscattering spectra for the crystals containing dislocations we have modified the existing Monte Carlo simulation code "McChasy". A new version of the code has been developed by implementing dislocations on the basis of the Peierls-Nabarro model. Parameters of the model have been determined from the high resolution transmission electron microscopy data. The newly developed method has been used to study the Ar-ion bombarded SrTiO3 samples. The best fit to the Rutherford backscattering/channeling spectra has been obtained by optimizing the linear combination of two kinds of defects: displaced atoms and bent channels. The great virtue of the Monte Carlo simulation is that unlike a traditional dechanneling analysis it allows quantitative analysis of crystals containing a mixture of different types of defects.

  13. End region effects upon the performance of a magnetohydrodynamic channel

    SciTech Connect (OSTI)

    Wang, S.Y.; Smith, J.M.

    1982-11-01

    Results presented in this paper apply only to plants of the size of 200 MW /SUB e/ and to MHD channels whose design requirements specify cooling with low-pressure, low-temperature boiler feedwater. The sensitivity of various channel parameters (maximum B-field, diffuser recovery coefficient, generator load parameter, Mach number, and combustor pressure) are examined under the constraints of a maximum axial electric field of 2.5kV/m, a maximum transverse current of 10 kA/m/sup 2/, and a maximum transverse electric field of 4 kV/m. In addition to voltage drop calculations, the channel code utilizes tabulated chemical equilibrium properties which are computed separately. Tables give operating conditions, electric stress constraints, and performance of the 16-m channel with end regions. Graphs show axial profiles of B-field, electric field, transverse current, load coefficient, and combustion pressure; and thermodynamic efficiency vs. Mach number for maximum B-field. Study of the MHD channel for a 540 MW /SUB th/ plant suggests that best performance is obtained in the supersonic mode; lowering B /SUB max/ to 5T does not severely lower performance and could result in a reduction of the magnet size of up to 40%; and overall performance is not too sensitive to diffuser pressure recovery coefficient.

  14. Dynamical Coupled-Channels Effects on Pion Photoproduction

    E-Print Network [OSTI]

    B. Julia-Diaz; T. -S. H. Lee; A. Matsuyama; T. Sato; L. C. Smith

    2008-01-07

    The electromagnetic pion production reactions are investigated within the dynamical coupled-channels model developed in {\\bf Physics Reports, 439, 193 (2007)}. The meson-baryon channels included in this study are $\\gamma N$, $\\pi N$, $\\eta N$, and the $\\pi\\Delta$, $\\rho N$ and $\\sigma N$ resonant components of the $\\pi\\pi N$ channel. With the hadronic parameters of the model determined in a recent study of $\\pi N$ scattering, we show that the pion photoproduction data up to the second resonance region can be described to a very large extent by only adjusting the bare $\\gamma N \\to N^*$ helicity amplitudes, while the non-resonant electromagnetic couplings are taken from previous works. It is found that the coupled-channels effects can contribute about 10 - 20 % of the production cross sections in the $\\Delta$ (1232) resonance region, and can drastically change the magnitude and shape of the cross sections in the second resonance region. The importance of the off-shell effects in a dynamical approach is also demonstrated. The meson cloud effects as well as the coupled-channels contributions to the $\\gamma N \\to N^*$ form factors are found to be mainly in the low $Q^2$ region. For the magnetic M1 $\\gamma N \\to \\Delta$ (1232) form factor, the results are close to that of the Sato-Lee Model. Necessary improvements to the model and future developments are discussed.

  15. Outage Probability Under Channel Distribution Uncertainty

    E-Print Network [OSTI]

    Loyka, Sergey

    Outage Probability Under Channel Distribution Uncertainty Ioanna Ioannou, Charalambos D. Charalambous and Sergey Loyka Abstract--Outage probability of a class of block-fading (MIMO) channels outage probability defined as min (over the input distribution) -max (over the channel distribution class

  16. Introduction Final Cooling Channel -High Frequency RF

    E-Print Network [OSTI]

    McDonald, Kirk

    Outline Introduction Final Cooling Channel - High Frequency RF Muon Collider Final Cooling Hisham Sayed February 27, 2014 1 / 10 #12;Outline Introduction Final Cooling Channel - High Frequency RF Table of Contents 1 Introduction 2 Final Cooling Channel - High Frequency RF 2 / 10 #12;Outline Introduction Final

  17. Multiple channel data acquisition system

    DOE Patents [OSTI]

    Crawley, H.B.; Rosenberg, E.I.; Meyer, W.T.; Gorbics, M.S.; Thomas, W.D.; McKay, R.L.; Homer, J.F. Jr.

    1990-05-22

    A multiple channel data acquisition system for the transfer of large amounts of data from a multiplicity of data channels has a plurality of modules which operate in parallel to convert analog signals to digital data and transfer that data to a communications host via a FASTBUS. Each module has a plurality of submodules which include a front end buffer (FEB) connected to input circuitry having an analog to digital converter with cache memory for each of a plurality of channels. The submodules are interfaced with the FASTBUS via a FASTBUS coupler which controls a module bus and a module memory. The system is triggered to effect rapid parallel data samplings which are stored to the cache memories. The cache memories are uploaded to the FEBs during which zero suppression occurs. The data in the FEBs is reformatted and compressed by a local processor during transfer to the module memory. The FASTBUS coupler is used by the communications host to upload the compressed and formatted data from the module memory. The local processor executes programs which are downloaded to the module memory through the FASTBUS coupler. 25 figs.

  18. Secretary Chu Tours the 2013 Washington Auto Show | Department...

    Energy Savers [EERE]

    Tours the 2013 Washington Auto Show Secretary Chu Tours the 2013 Washington Auto Show January 31, 2013 - 5:04pm Addthis 1 of 10 While at the Washington Auto Show, Energy Secretary...

  19. Effects of all-terrain vehicle trails on stream channel characteristics, Ouachita National Forest, Arkansas 

    E-Print Network [OSTI]

    Rohrer, Deven Michelle

    2001-01-01

    Research shows that road and trail crossings have negative impacts on forest streams, and that off-road vehicles are detrimental to the environment. However, little information is available concerning the effects of such vehicles on stream channels...

  20. Channel noise induced stochastic facilitation in an auditory brainstem neuron model

    E-Print Network [OSTI]

    Brett A. Schmerl; Mark D. McDonnell

    2013-12-05

    Neuronal membrane potentials fluctuate stochastically due to conductance changes caused by random transitions between the open and close states of ion channels. Although it has previously been shown that channel noise can nontrivially affect neuronal dynamics, it is unknown whether ion-channel noise is strong enough to act as a noise source for hypothesised noise-enhanced information processing in real neuronal systems, i.e. 'stochastic facilitation.' Here, we demonstrate that biophysical models of channel noise can give rise to two kinds of recently discovered stochastic facilitation effects in a Hodgkin-Huxley-like model of auditory brainstem neurons. The first, known as slope-based stochastic resonance (SBSR), enables phasic neurons to emit action potentials that can encode the slope of inputs that vary slowly relative to key time-constants in the model. The second, known as inverse stochastic resonance (ISR), occurs in tonically firing neurons when small levels of noise inhibit tonic firing and replace it with burst-like dynamics. Consistent with previous work, we conclude that channel noise can provide significant variability in firing dynamics, even for large numbers of channels. Moreover, our results show that possible associated computational benefits may occur due to channel noise in neurons of the auditory brainstem. This holds whether the firing dynamics in the model are phasic (SBSR can occur due to channel noise) or tonic (ISR can occur due to channel noise).

  1. Channeling

    Office of Scientific and Technical Information (OSTI)

    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 Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding accessby a contractorEnergy, science, and7451SciTechLoS

  2. Smart Surface and Lubrication Engineering show Promise for Gearbox...

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

    Smart Surface and Lubrication Engineering show Promise for Gearbox Reliability Smart Surface and Lubrication Engineering show Promise for Gearbox Reliability May 20, 2011 - 1:10pm...

  3. Energy Innovation Hub Report Shows Philadelphia-area Building...

    Office of Environmental Management (EM)

    Innovation Hub Report Shows Philadelphia-area Building Retrofits Could Support 23,500 Jobs Energy Innovation Hub Report Shows Philadelphia-area Building Retrofits Could Support...

  4. Federal Energy Management Trade Show | Department of Energy

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

    Federal Energy Management Trade Show Federal Energy Management Trade Show Addthis 1 of 4 Timothy Unruh, Program Manager for the Office of Energy Efficiency and Renewable Energy...

  5. Fundamental channeling questions at ultra relativistic energies

    SciTech Connect (OSTI)

    Carrigan, Richard A., Jr.; /Fermilab

    2006-08-01

    TeV-range bent crystal channeling has interesting advantages for several applications at high energy accelerators. Observations of enhanced deflection over the whole arc of a bent crystal at RHIC and recently at the Tevatron may be due to a process called ''volume reflection''. More investigations of volume reflection and of the complimentary process, volume capture, are needed. So-called quasimosaic bending processes also deserve additional study. Negative particle channeling may be relevant to channeling collimation for electron machines. Electron and positron channeling and channeling radiation are interwoven so that the impact of channeling radiation on applications needs to be better understood. Beams in the 0.1 to 1 GeV range may be useful for some of these investigations. Finally there has been little or no study of positive and negative muon channeling. The current understanding of these topics and the desirability of further work is reviewed.

  6. Thermal transpiration through single walled carbon nanotubes and graphene channels

    SciTech Connect (OSTI)

    Thekkethala, Joe Francis; Sathian, Sarith P., E-mail: sarith@nitc.ac.in [Computational Nanotechnology Laboratory, School of Nano Science and Technology, National Institute of Technology Calicut, Kozhikode, Kerala - 673601 (India)

    2013-11-07

    Thermal transpiration through carbon nanotubes (CNTs) and graphene channels is studied using molecular dynamics (MD) simulations. The system consists of two reservoirs connected by a CNT. It is observed that a flow is developed inside the CNT from the low temperature reservoir to the high temperature reservoir when the two reservoirs are maintained at different temperatures. The influence of channel size and temperature gradient on the mean velocity is analysed by varying the CNT diameter and the temperature of one of the reservoirs. Larger flow rate is observed in the smaller diameter CNTs showing an increase in the mean velocity with increase in the temperature gradient. For the flow developed inside the CNTs, slip boundaries occur and the slip length is calculated using the velocity profile. We examine the effect of fluid-wall interaction strength (?{sub fw}), diffusivity (D), and viscosity of the fluid (?) on the temperature induced fluid transport through the CNTs. Similar investigations are also carried out by replacing the CNT with a graphene channel. Results show that the mean velocity of the fluid atoms in the graphene channel is lower than that through the CNTs. This can be attributed to the higher degree of confinement observed in the CNTs.

  7. New Report Shows Trend Toward Larger Offshore Wind Systems, with...

    Office of Environmental Management (EM)

    New Report Shows Trend Toward Larger Offshore Wind Systems, with 11 Advanced Stage Projects Proposed in U.S. Waters New Report Shows Trend Toward Larger Offshore Wind Systems, with...

  8. Geothermal Energy Featured on NBC's Today Show | Department of...

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

    Featured on NBC's Today Show Geothermal Energy Featured on NBC's Today Show November 18, 2008 - 2:49pm Addthis In Iceland, there are five major geothermal power plants which...

  9. New Report Shows Trend Toward Larger Offshore Wind Systems, with...

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

    Report Shows Trend Toward Larger Offshore Wind Systems, with 11 Advanced Stage Projects Proposed in U.S. Waters New Report Shows Trend Toward Larger Offshore Wind Systems, with 11...

  10. Latest Report Shows Cost of Going Solar has Dropped Significantly...

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

    Latest Report Shows Cost of Going Solar has Dropped Significantly for 5 Years Latest Report Shows Cost of Going Solar has Dropped Significantly for 5 Years August 12, 2015 - 2:28pm...

  11. New Report Shows Downward Trend in LCOE for Wind | Department...

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

    Report Shows Downward Trend in LCOE for Wind New Report Shows Downward Trend in LCOE for Wind May 18, 2015 - 2:48pm Addthis A new report recently published by the U.S. Department...

  12. New Report Shows Domestic Offshore Wind Industry Potential, 21...

    Office of Environmental Management (EM)

    Report Shows Domestic Offshore Wind Industry Potential, 21 Projects Planned in U.S. Waters New Report Shows Domestic Offshore Wind Industry Potential, 21 Projects Planned in U.S....

  13. Structure of the Transmembrane Regions of a Bacterial Cyclic Nucleotide-Regulated Channel

    SciTech Connect (OSTI)

    Clayton,G.; Latieri, S.; Heginbotham, L.; Unger, V.; Morais-Cabral, J.

    2008-01-01

    The six-transmembrane helix (6 TM) tetrameric cation channels form the largest ion channel family, some members of which are voltage-gated and others are not. There are no reported channel structures to match the wealth of functional data on the non-voltage-gated members. We determined the structure of the transmembrane regions of the bacterial cyclic nucleotide-regulated channel MlotiK1, a non-voltage-gated 6 TM channel. The structure showed how the S1-S4 domain and its associated linker can serve as a clamp to constrain the gate of the pore and possibly function in concert with ligand-binding domains to regulate the opening of the pore. The structure also led us to hypothesize a new mechanism by which motions of the S6 inner helices can gate the ion conduction pathway at a position along the pore closer to the selectivity filter than the canonical helix bundle crossing.

  14. Structure of conducting channel of lightning

    SciTech Connect (OSTI)

    Alanakyan, Yu. R.

    2013-08-15

    The spatial distribution of the plasma density in a lightning channel is studied theoretically. It is shown that the electric-field double layer is formed at the channel boundary. In this case, the electron temperature changes abruptly and ions are accelerated by the electric field of the double layer. The ion momentum flux density is close to the surrounding gas pressure. Cleaning of the channel from heavy particles occurs in particle-exchange processes between the plasma channel and the surrounding air. Hydrogen ions are accumulated inside the expanding channel from the surrounding air, which is enriched by hydrogen-contained molecules. In this case, the plasma channel is unstable and splits to a chain of equidistant bunches of plasma. The hydrogen-enrich bunches burn diffusely after recombination exhibiting the bead lightning behavior.

  15. Web-based multi-channel analyzer

    DOE Patents [OSTI]

    Gritzo, Russ E.

    2003-12-23

    The present invention provides an improved multi-channel analyzer designed to conveniently gather, process, and distribute spectrographic pulse data. The multi-channel analyzer may operate on a computer system having memory, a processor, and the capability to connect to a network and to receive digitized spectrographic pulses. The multi-channel analyzer may have a software module integrated with a general-purpose operating system that may receive digitized spectrographic pulses for at least 10,000 pulses per second. The multi-channel analyzer may further have a user-level software module that may receive user-specified controls dictating the operation of the multi-channel analyzer, making the multi-channel analyzer customizable by the end-user. The user-level software may further categorize and conveniently distribute spectrographic pulse data employing non-proprietary, standard communication protocols and formats.

  16. Entanglement Transmission Capacity of Compound Channels

    E-Print Network [OSTI]

    Igor Bjelakovic; Holger Boche; Janis Noetzel

    2009-04-20

    We determine the optimal achievable rate at which entanglement can be reliably transmitted when the memoryless channel used during transmission is unknown both to sender and receiver. To be more precise, we assume that both of them only know that the channel belongs to a given set of channels. Thus, they have to use encoding and decoding schemes that work well for the whole set.

  17. Strong converse exponents for a quantum channel discrimination problem and quantum-feedback-assisted communication

    E-Print Network [OSTI]

    Tom Cooney; Milán Mosonyi; Mark M. Wilde

    2015-02-26

    This paper studies the difficulty of discriminating between an arbitrary quantum channel and a "replacer" channel that discards its input and replaces it with a fixed state. The results obtained here generalize those known in the theory of quantum hypothesis testing for binary state discrimination. We show that, in this particular setting, the most general adaptive discrimination strategies provide no asymptotic advantage over non-adaptive tensor-power strategies. This conclusion follows by proving a quantum Stein's lemma for this channel discrimination setting, showing that a constant bound on the Type I error leads to the Type II error decreasing to zero exponentially quickly at a rate determined by the maximum relative entropy registered between the channels. The strong converse part of the lemma states that any attempt to make the Type II error decay to zero at a rate faster than the channel relative entropy implies that the Type I error necessarily converges to one. We then refine this latter result by identifying the optimal strong converse exponent for this task. As a consequence of these results, we can establish a strong converse theorem for the quantum-feedback-assisted capacity of a channel, sharpening a result due to Bowen. Furthermore, our channel discrimination result demonstrates the asymptotic optimality of a non-adaptive tensor-power strategy in the setting of quantum illumination, as was used in prior work on the topic. The sandwiched Renyi relative entropy is a key tool in our analysis. Finally, by combining our results with recent results of Hayashi and Tomamichel, we find a novel operational of the mutual information of a quantum channel N as the optimal type II error exponent when discriminating between a large number of independent instances of N and an arbitrary "worst-case" replacer channel chosen from the set of all replacer channels.

  18. Transfer information remotely via noise entangled coherent channels

    E-Print Network [OSTI]

    A. El Allati; N. Metwally; Y. Hassouni

    2010-02-11

    In this contribution, a generalized protocol of quantum teleportation is suggested to investigate the possibility of remotely transfer unknown multiparities entangled coherent state. A theoretical technique is introduced to generate maximum entangled coherent states which are used as quantum channels. We show that the mean photon number plays a central role on the fidelity of the transferred information. The noise parameter can be considered as a control parameter only for small values of the mean photon number.

  19. Spontaneous Formation of Biomimetic, Nanoporous Membrane Channels...

    Office of Science (SC) Website

    of porins (protein-based biological channels), such as selective transport of protons, water, ions, and small molecules. The Impact The predictive design and creation of robust...

  20. Coding and detection for 2-dimensional channels

    E-Print Network [OSTI]

    Demirkan, ?smail

    2006-01-01

    Systems Two-dimensional Storage Systems Channel Modeling andOF FIGURES A typical storage system. Acronym MC stands forfor holographic storage systems. . . . . . . Discrete-time

  1. Southern California Channel Islands Bibliography, through 1992

    E-Print Network [OSTI]

    Channel Islands National Marine Sanctuary

    1992-01-01

    Channel/Santa Maria Basin/Elk Hills/San Joaquin Basin/Chicosiliceous composition/Elk Hills/San Joaquin Basin/Chico

  2. Morphology of rain water channelization in systematically varied model sandy soils

    E-Print Network [OSTI]

    Y. Wei; C. M. Cejas; R. Barrois; R. Dreyfus; D. J. Durian

    2014-03-13

    We visualize the formation of fingered flow in dry model sandy soils under different raining conditions using a quasi-2d experimental set-up, and systematically determine the impact of soil grain diameter and surface wetting property on water channelization phenomenon. The model sandy soils we use are random closely-packed glass beads with varied diameters and surface treatments. For hydrophilic sandy soils, our experiments show that rain water infiltrates into a shallow top layer of soil and creates a horizontal water wetting front that grows downward homogeneously until instabilities occur to form fingered flows. For hydrophobic sandy soils, in contrast, we observe that rain water ponds on the top of soil surface until the hydraulic pressure is strong enough to overcome the capillary repellency of soil and create narrow water channels that penetrate the soil packing. Varying the raindrop impinging speed has little influence on water channel formation. However, varying the rain rate causes significant changes in water infiltration depth, water channel width, and water channel separation. At a fixed raining condition, we combine the effects of grain diameter and surface hydrophobicity into a single parameter and determine its influence on water infiltration depth, water channel width, and water channel separation. We also demonstrate the efficiency of several soil water improvement methods that relate to rain water channelization phenomenon, including pre-wetting sandy soils at different level before rainfall, modifying soil surface flatness, and applying superabsorbent hydrogel particles as soil modifiers.

  3. Statistical Hot Channel Analysis for the NBSR

    SciTech Connect (OSTI)

    Cuadra A.; Baek J.

    2014-05-27

    A statistical analysis of thermal limits has been carried out for the research reactor (NBSR) at the National Institute of Standards and Technology (NIST). The objective of this analysis was to update the uncertainties of the hot channel factors with respect to previous analysis for both high-enriched uranium (HEU) and low-enriched uranium (LEU) fuels. Although uncertainties in key parameters which enter into the analysis are not yet known for the LEU core, the current analysis uses reasonable approximations instead of conservative estimates based on HEU values. Cumulative distribution functions (CDFs) were obtained for critical heat flux ratio (CHFR), and onset of flow instability ratio (OFIR). As was done previously, the Sudo-Kaminaga correlation was used for CHF and the Saha-Zuber correlation was used for OFI. Results were obtained for probability levels of 90%, 95%, and 99.9%. As an example of the analysis, the results for both the existing reactor with HEU fuel and the LEU core show that CHFR would have to be above 1.39 to assure with 95% probability that there is no CHF. For the OFIR, the results show that the ratio should be above 1.40 to assure with a 95% probability that OFI is not reached.

  4. Geometric pumping in autophoretic channels

    E-Print Network [OSTI]

    Michelin, Sébastien; Montenegro-Johnson, Thomas D.; De Canio, Gabriele; Lobato- Dauzier, Nicolas; Lauga, Eric

    2015-05-07

    ’s function for Laplace’s equation, Eq. (4), is given by ?(x,y;? ,?) = 1 4pi ? ? n=?? ln [ (x?? +2npi)2+(y??)2 ] = 1 4pi ln[2(cosh(y??)? cos(x?? ))]. (7) Assuming that the channel walls are smooth, the concentration at a point (x,y) on one of the walls can... of the top wall, ? , in the cases a/H = 1/2, L/H = 2pi and 0 ? ? ? pi . The four red dots correspond to the different panels illustrated in Figure 3. for K = 12 ln [2cosh(yˆ)?2cos(xˆ)]. The computational pro- cedure for discretizing the domain boundary...

  5. Sandia Energy - New Material Tests Show Biaxial Laminate Creep...

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

    Material Tests Show Biaxial Laminate Creep Is Important for Large Wind-Turbine Blades Home Renewable Energy Energy Partnership News Wind Energy News & Events New Material Tests...

  6. ORISE: Report shows nuclear engineering graduation rates leveling...

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

    ORISE report shows nuclear engineering graduation rates leveling off in 2014 after five years of increase Decline seen in undergraduate and master degrees, while number of doctoral...

  7. ORISE: Report shows nuclear engineering graduation rates on the...

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

    ORISE report shows nuclear engineering graduation rates on the rise in 2013 Number of graduate degrees expected to remain consistent, but undergraduate degrees could see decrease...

  8. SLIDESHOW: Secretary Moniz Tours 2014 Washington Auto Show

    Broader source: Energy.gov [DOE]

    A slideshow featuring highlights from Secretary Moniz's tour of the 2014 Washington Auto Show is currently posted on the Energy Department's blog.

  9. NREL: Technology Transfer - New Video Shows How NREL Is Redefining...

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

    New Video Shows How NREL Is Redefining What's Possible for Renewable Energy Through Grid Integration January 23, 2015 NREL is spearheading engineering innovations that will help...

  10. Sandia Energy - Biofuels Blend Right In: Researchers Show Ionic...

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

    Biofuels Blend Right In: Researchers Show Ionic Liquids Effective for Pretreating Mixed Blends of Biofuel Feedstocks Home Renewable Energy Energy Transportation Energy Biofuels...

  11. Partially Overlapped Channel Assignment for Multi-Channel Wireless Mesh Networks

    E-Print Network [OSTI]

    Wong, Vincent

    -WMN) consists of a number of stationary wireless routers, forming a multi-hop wireless backbone. Each router channel in the IEEE 802.11a/b/g bands. The wireless mesh routers serve as access points for wirelessPartially Overlapped Channel Assignment for Multi-Channel Wireless Mesh Networks A. Hamed Mohsenian

  12. Ancient bacteria show evidence of DNA repair Sarah Stewart Johnson*

    E-Print Network [OSTI]

    Nielsen, Rasmus

    Ancient bacteria show evidence of DNA repair Sarah Stewart Johnson* , Martin B. Hebsgaard , Torben for review June 14, 2007) Recent claims of cultivable ancient bacteria within sealed environ- ments highlight-term survival of bacteria sealed in frozen conditions for up to one million years. Our results show evidence

  13. (25) 1. Show that for all sets A and B,

    E-Print Network [OSTI]

    (15) 2 . (a) Show that for all sets A and B,. (A; u @(B) 5- @(AvB). (15) (b) Show b constru tin a counter exam 1e that it is not. Y 6% g P the case that (AU B) c @(A) ...

  14. Sodium channel activation mechanisms. Insights from deuterium oxide substitution

    SciTech Connect (OSTI)

    Alicata, D.A.; Rayner, M.D.; Starkus, J.G. )

    1990-04-01

    Schauf and Bullock, using Myxicola giant axons, demonstrated that solvent substitution with deuterium oxide (D2O) significantly affects both sodium channel activation and inactivation kinetics without corresponding changes in gating current or tail current rates. They concluded that (a) no significant component of gating current derives from the final channel opening step, and (b) channels must deactivate (during tail currents) by a different pathway from that used in channel opening. By contrast, Oxford found in squid axons that when a depolarizing pulse is interrupted by a brief (approximately 100 microseconds) return to holding potential, subsequent reactivation (secondary activation) is very rapid and shows almost monoexponential kinetics. Increasing the interpulse interval resulted in secondary activation rate returning towards control, sigmoid (primary activation) kinetics. He concluded that channels open and close (deactivate) via the same pathway. We have repeated both sets of observations in crayfish axons, confirming the results obtained in both previous studies, despite the apparently contradictory conclusions reached by these authors. On the other hand, we find that secondary activation after a brief interpulse interval (50 microseconds) is insensitive to D2O, although reactivation after longer interpulse intervals (approximately 400 microseconds) returns towards a D2O sensitivity similar to that of primary activation. We conclude that D2O-sensitive primary activation and D2O-insensitive tail current deactivation involve separate pathways. However, D2O-insensitive secondary activation involves reversal of the D2O-insensitive deactivation step. These conclusions are consistent with parallel gate models, provided that one gating particle has a substantially reduced effective valence.

  15. Fourier transform channeled spectropolarimetry in the MWIR

    E-Print Network [OSTI]

    Dereniak, Eustace L.

    Fourier transform channeled spectropolarimetry in the MWIR Michael W. Kudenov,1 Nathan A. Hagen, 1 Abstract: A complete Fourier Transform Spectropolarimeter in the MWIR is demonstrated. The channeled and links 1. P. Griffiths and J. D. Haseth, "Fourier Transform Infrared Spectrometry," (John Wiley & Sons

  16. Energy Harvesting Diamond Channel with Energy Cooperation

    E-Print Network [OSTI]

    Ulukus, Sennur

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

  17. Lithographically Patterned Channels Spatially Segregate Kinesin Motor

    E-Print Network [OSTI]

    Hancock, William O.

    Lithographically Patterned Channels Spatially Segregate Kinesin Motor Activity and Effectively Received March 25, 2003 ABSTRACT To extract useful work from biological motor proteins, it is necessary microfabrication to construct 1.5-µm-deep channels in SU-8 photoresist patterned on glass. Although motor proteins

  18. 5G Millimeter Wave Channel Model Alliance

    E-Print Network [OSTI]

    5G Millimeter Wave Channel Model Alliance There is an industry and research community need Alliance of companies, academia, and government organizations to support the development of more accurate, consis- tent, and predictive channel models. To facilitate the formation of this Alliance, NIST plans

  19. Single Sub-20 nm Wide, Centimeter-Long Nanofluidic Channel

    E-Print Network [OSTI]

    Single Sub-20 nm Wide, Centimeter-Long Nanofluidic Channel Fabricated by Novel Nanoimprint Mold an imprint mold of a channel pattern and nanoimprint to duplicate such channel. The centimeter-long channel without additional size shrinking.17 Single channels have been fabricated by using edge patterning18 (note

  20. Biological Monitoring at Amchitka Appears to Show Impacts from...

    Office of Environmental Management (EM)

    of the monitoring showed that Dolly Varden (a type of freshwater char, a trout-like fish), rockweed (littoral-zone algae), and to a lesser extent, Irish Lord (a small...

  1. Dynein Motor Domain Shows Ring-Shaped Motor, Buttress

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

    Dynein Motor Domain Shows Ring-Shaped Motor, Buttress Print Movement is fundamental to life. It takes place even at the cellular level where cargo is continually being transported...

  2. New Report Shows Trend Toward Larger Offshore Wind Systems

    Broader source: Energy.gov [DOE]

    The Energy Department released a new report showing progress for the U.S. offshore wind energy market in 2012, including 11 commercial-scale U.S. projects reaching an advanced stage of development.

  3. Appointment Scheduling under Patient Preference and No-Show Behavior

    E-Print Network [OSTI]

    Topaloglu, Huseyin

    and managing per capita cost of care; see Berwick et al. (2008) and Institute for Healthcare Improvement (2012. The service provider collects a "revenue" from each patient who shows up and incurs a "service cost

  4. Does Roush show that evidence should be probable?

    E-Print Network [OSTI]

    Fennell, Damien; Cartwright, Nancy

    2010-01-01

    DOI 10.1007/s11229-009-9510-3 Does Roush show that evidencecondition. However, he does not adopt a condition similar toprovide leverage. She does not want P(h) to be presupposed

  5. Secretary Chu Speaks at the 2010 Washington Auto Show

    Broader source: Energy.gov [DOE]

    at the 2010 Washington Auto Show, Secretary Chu lays out a roadmap for how the U.S. can lead the world in making the clean vehicles we need. He also announced that the Department of Energy had...

  6. Global Climate Change Assessment Report Shows Nations Not Doing...

    Open Energy Info (EERE)

    Global Climate Change Assessment Report Shows Nations Not Doing Enough Home > Blogs > Dc's blog Dc's picture Submitted by Dc(266) Contributor 5 November, 2014 - 15:49 The latest...

  7. Boron-Nitride Nanotubes Show Potential in Cancer Treatment |...

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

    Boron-Nitride Nanotubes Show Potential in Cancer Treatment NEWPORT NEWS, VA, April 26 - A new study has shown that adding boron-nitride nanotubes to the surface of cancer cells can...

  8. The Chemistry Magic Show Captivates Kids | GE Global Research

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

    Chemistry Magic Show Captivates Kids Click to email this to a friend (Opens in new window) Share on Facebook (Opens in new window) Click to share (Opens in new window) Click to...

  9. ORISE: Report shows number of health physics degrees for 2010

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

    report shows number of health physics degrees increased for graduates, decreased for undergraduates in 2010 Decreased number of B.S. degrees remains higher than levels in the early...

  10. Comparative effects of sodium channel blockers in short term rat whole embryo culture

    SciTech Connect (OSTI)

    Nilsson, Mats F, E-mail: Mats.Nilsson@farmbio.uu.se [Department of Pharmaceutical Biosciences, Uppsala University (Sweden); Sköld, Anna-Carin; Ericson, Ann-Christin; Annas, Anita; Villar, Rodrigo Palma [AstraZeneca R and D Södertälje (Sweden); Cebers, Gvido [AstraZeneca R and D, iMed, 141 Portland Street, Cambridge, MA 02139 (United States); Hellmold, Heike; Gustafson, Anne-Lee [AstraZeneca R and D Södertälje (Sweden); Webster, William S [Department of Anatomy and Histology, University of Sydney (Australia)

    2013-10-15

    This study was undertaken to examine the effect on the rat embryonic heart of two experimental drugs (AZA and AZB) which are known to block the sodium channel Nav1.5, the hERG potassium channel and the L-type calcium channel. The sodium channel blockers bupivacaine, lidocaine, and the L-type calcium channel blocker nifedipine were used as reference substances. The experimental model was the gestational day (GD) 13 rat embryo cultured in vitro. In this model the embryonic heart activity can be directly observed, recorded and analyzed using computer assisted image analysis as it responds to the addition of test drugs. The effect on the heart was studied for a range of concentrations and for a duration up to 3 h. The results showed that AZA and AZB caused a concentration-dependent bradycardia of the embryonic heart and at high concentrations heart block. These effects were reversible on washout. In terms of potency to cause bradycardia the compounds were ranked AZB > bupivacaine > AZA > lidocaine > nifedipine. Comparison with results from previous studies with more specific ion channel blockers suggests that the primary effect of AZA and AZB was sodium channel blockage. The study shows that the short-term rat whole embryo culture (WEC) is a suitable system to detect substances hazardous to the embryonic heart. - Highlights: • Study of the effect of sodium channel blocking drugs on embryonic heart function • We used a modified method rat whole embryo culture with image analysis. • The drugs tested caused a concentration dependent bradycardia and heart block. • The effect of drugs acting on multiple ion channels is difficult to predict. • This method may be used to detect cardiotoxicity in prenatal development.

  11. Electrically tunable localized tunneling channels in silicene nanoribbons

    SciTech Connect (OSTI)

    Saari, Timo; Huang, Cheng-Yi; Tsai, Wei-Feng; Nieminen, Jouko; Lin, Hsin; Bansil, Arun

    2014-04-28

    The topological phase of a silicene nanoribbon holding edge states in the bulk energy gap can be easily broken by an external electric field. Here, we show through low-energy Green's function calculations that it is possible to localize conducting channels anywhere in a silicene nanoribbon by applying an inhomogeneous electric field. The spin degeneracy of these channels can also be broken in the same manner, allowing conduction of spin as well as charge. On this basis, we suggest design of a ternary logic device, which could be used in low-power circuits. Our study demonstrates that silicene and related group IV elements with honeycomb structure could provide a platform for efficient manipulation of spin currents via external electric fields, without the need to switch magnetic fields for spintronics applications.

  12. Optimal Encoding Capacity of a Linear Optical Quantum Channel

    E-Print Network [OSTI]

    Jake A. Smith; Dmitry B. Uskov; Lev Kaplan

    2015-08-10

    Here, we study the capacity of a quantum channel, assuming linear optical encoding, as a function of available photons and optical modes. First, we observe that substantial improvement is made possible by not restricting ourselves to a rail-encoded qubit basis. Then, we derive an analytic formula for general channel capacity and show that this capacity is achieved without requiring the use of entangling operations typically required for scalable universal quantum computation, e.g. KLM measurement-assisted transformations. As an example, we provide an explicit encoding scheme using the resources required of standard dense coding using two dual-rail qubits (2 photons in 4 modes). In this case, our protocol encodes one additional bit of information. Greater gains are expected for larger systems.

  13. Chirality separation of mixed chiral microswimmers in a periodic channel

    E-Print Network [OSTI]

    Bao-quan Ai; Ya-feng He; Wei-rong Zhong

    2015-05-10

    Dynamics and separation of mixed chiral microswimmers are numerically investigated in a channel with regular arrays of rigid half-circle obstacles. For zero shear flow, transport behaviors are the same for different chiral particles: the average velocity decreases with increase of the rotational diffusion coefficient, the direction of the transport can be reversed by tuning the angular velocity, and there exists an optimal value of the packing fraction at which the average velocity takes its maximal value. However, when the shear flow is considered, different chiral particles show different behaviors. By suitably tailoring parameters, particles with different chiralities can move in different directions and be separated. In addition, we also proposed a space separation method by introducing a constant load, where counterclockwise and clockwise particles stay in different regions of the channel.

  14. Wireless Fading Channel Models: From Classical to Stochastic Differential Equations

    SciTech Connect (OSTI)

    Olama, Mohammed M [ORNL; Djouadi, Seddik M [ORNL; Charalambous, Prof. Charalambos [University of Cyprus

    2010-01-01

    The wireless communications channel constitutes the basic physical link between the transmitter and the receiver antennas. Its modeling has been and continues to be a tantalizing issue, while being one of the most fundamental components based on which transmitters and receivers are designed and optimized. The ultimate performance limits of any communication system are determined by the channel it operates in. Realistic channel models are thus of utmost importance for system design and testing. In addition to exponential power path-loss, wireless channels suffer from stochastic short term fading (STF) due to multipath, and stochastic long term fading (LTF) due to shadowing depending on the geographical area. STF corresponds to severe signal envelope fluctuations, and occurs in densely built-up areas filled with lots of objects like buildings, vehicles, etc. On the other hand, LTF corresponds to less severe mean signal envelope fluctuations, and occurs in sparsely populated or suburban areas. In general, LTF and STF are considered as superimposed and may be treated separately. Ossanna was the pioneer to characterize the statistical properties of the signal received by a mobile user, in terms of interference of incident and reflected waves. His model was better suited for describing fading occurring mainly in suburban areas (LTF environments). It is described by the average power loss due to distance and power loss due to reflection of signals from surfaces, which when measured in dB's give rise to normal distributions, and this implies that the channel attenuation coefficient is log-normally distributed. Furthermore, in mobile communications, the LTF channel models are also characterized by their special correlation characteristics which have been reported. Clarke introduced the first comprehensive scattering model describing STF occurring mainly in urban areas. An easy way to simulate Clarke's model using a computer simulation is described. This model was later expanded to three-dimensions (3D) by Aulin. An indoor STF was introduced. Most of these STF models provide information on the frequency response of the channel, described by the Doppler power spectral density (DPSD). Aulin presented a methodology to find the Doppler power spectrum by computing the Fourier transform of the autocorrelation function of the channel impulse response with respect to time. A different approach, leading to the same Doppler power spectrum relation was presented by Gans. These STF models suggest various distributions for the received signal amplitude such as Rayleigh, Rician, or Nakagami. Models based on autoregressive and moving averages (AR) are proposed. However, these models assume that the channel state is completely observable, which in reality is not the case due to additive noise, and requires long observation intervals. First order Markov models for Raleigh fading have been proposed, and the usefulness of a finite-state Markov channel model is argued. Mobile-to-mobile (or ad hoc) wireless networks comprise nodes that freely and dynamically self-organize into arbitrary and/or temporary network topology without any fixed infrastructure support. They require direct communication between a mobile transmitter and a mobile receiver over a wireless medium. Such mobile-to-mobile communication systems differ from the conventional cellular systems, where one terminal, the base station, is stationary, and only the mobile station is moving. As a consequence, the statistical properties of mobile-to-mobile links are different from cellular ones. Copious ad hoc networking research exists on layers in the open system interconnection (OSI) model above the physical layer. However, neglecting the physical layer while modeling wireless environment is error prone and should be considered more carefully. The experimental results show that the factors at the physical layer not only affect the absolute performance of a protocol, but because their impact on different protocols is nonuniform, it can even change the relative ranking among protocols for the sa

  15. Thoughts on Incorporating HPRF in a Linear Cooling Channel

    E-Print Network [OSTI]

    Gallardo, Juan C.

    2010-01-01

    International Muon Ionization Cooling Experiment (MICE), in.of using HPRF in a linear cooling channel. A hybrid channelHPRF In A Linear Cooling Channel Juan C. Gallardo a and

  16. DECODING LDPC CODES OVER BINARY CHANNELS WITH ADDITIVE MARKOV NOISE

    E-Print Network [OSTI]

    Alajaji, Fady

    ) for the case of memoryless channels and is similar to the one developed for the Gilbert­ Elliot channel [2, 3 the Gilbert­Elliot Channel (GEC) [5]. These chan­ nel models are simple and widely used, but they have

  17. Hydraulic and slurry flows through a channel contraction

    E-Print Network [OSTI]

    Al Hanbali, Ahmad

    Hydraulic and slurry flows through a channel contraction Onno Bokhove o, Twente #12;Hydraulic flow through channel contraction Outline · 1. Introduction · 2. Experiments · 3. Conclusions · References ISSF 2008 University of Twente Page 2 #12;Hydraulic flow through channel contraction

  18. Solution to time-energy costs of quantum channels

    E-Print Network [OSTI]

    Chi-Hang Fred Fung; H. F. Chau; Chi-Kwong Li; Nung-Sing Sze

    2014-12-16

    We derive a formula for the time-energy costs of general quantum channels proposed in [Phys. Rev. A 88, 012307 (2013)]. This formula allows us to numerically find the time-energy cost of any quantum channel using positive semidefinite programming. We also derive a lower bound to the time-energy cost for any channels and the exact the time-energy cost for a class of channels which includes the qudit depolarizing channels and projector channels as special cases.

  19. Coupled-channel scattering on a torus

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

    Guo, Peng; Dudek, Jozef Jon; Edwards, Robert G.; Szczepaniak, Adam Pawel

    2013-07-01

    Based on the Hamiltonian formalism approach, a generalized Luscher's formula for two particle scattering in both the elastic and coupled-channel cases in moving frames is derived from a relativistic Lippmann-Schwinger equation. Some strategies for extracting scattering amplitudes for a coupled-channel system from the discrete finite-volume spectrum are discussed and illustrated with a toy model of two-channel resonant scattering. This formalism will, in the near future, be used to extract information about hadron scattering from lattice QCD computations.

  20. Multi-channel polarized thermal emitter

    DOE Patents [OSTI]

    Lee, Jae-Hwang; Ho, Kai-Ming; Constant, Kristen P

    2013-07-16

    A multi-channel polarized thermal emitter (PTE) is presented. The multi-channel PTE can emit polarized thermal radiation without using a polarizer at normal emergence. The multi-channel PTE consists of two layers of metallic gratings on a monolithic and homogeneous metallic plate. It can be fabricated by a low-cost soft lithography technique called two-polymer microtransfer molding. The spectral positions of the mid-infrared (MIR) radiation peaks can be tuned by changing the periodicity of the gratings and the spectral separation between peaks are tuned by changing the mutual angle between the orientations of the two gratings.

  1. Channels and jokers in continuous systems

    SciTech Connect (OSTI)

    Butkovskii, O. Ya., E-mail: olegb@vlsu.ru; Logunov, M. Yu. [Vladimir State University (Russian Federation)

    2007-06-15

    The Roessler system is used as an example to demonstrate that the reconstruction of a model nonlinear dynamical system from an observed time series reveals phase-space regions called channels and jokers [3]. The proposed method for finding such regions is shown to be robust to noise and inaccuracy (redundancy) of the models used in the reconstruction procedure. The evolution of local Lyapunov exponents of attractors is examined for the model systems, and its relation to channels and jokers is exposed. It is shown that channels and jokers can be used in predictive modeling. The quality of such models is analyzed by invoking the concept of degree of predictability.

  2. TWO-CHANNEL DIELECTRIC WAKE FIELD ACCELERATOR

    SciTech Connect (OSTI)

    Jay L. Hirshfield

    2012-05-30

    Experimental results are reported for test beam acceleration and deflection in a two-channel, cm-scale, rectangular dielectric-lined wakefield accelerator structure energized by a 14-MeV drive beam. The dominant waveguide mode of the structure is at {approx}30 GHz, and the structure is configured to exhibit a high transformer ratio ({approx}12:1). Accelerated bunches in the narrow secondary channel of the structure are continuously energized via Cherenkov radiation that is emitted by a drive bunch moving in the wider primary channel. Observed energy gains and losses, transverse deflections, and changes in the test bunch charge distribution compare favorably with predictions of theory.

  3. Show No Weakness: Sequentially Consistent Specifications of TSO Libraries

    E-Print Network [OSTI]

    Gotsman, Alexey

    Show No Weakness: Sequentially Consistent Specifications of TSO Libraries Alexey Gotsman1.g., for those that are data-race free (DRF). However, performance-critical libraries often violate, it is important for these libraries to protect their otherwise well-behaved clients from the weaker memory model

  4. New World cattle show ancestry from multiple independent domestication events

    E-Print Network [OSTI]

    Hillis, David

    New World cattle show ancestry from multiple independent domestication events Emily Jane Mc December 17, 2012) Previous archeological and genetic research has shown that modern cattle breeds in taurine and indicine lines of cattle, respectively. American descendants of cattle brought by European

  5. ORIGINAL ARTICLE Isolation of Enterobacter cowanii from Eucalyptus showing

    E-Print Network [OSTI]

    ORIGINAL ARTICLE Isolation of Enterobacter cowanii from Eucalyptus showing symptoms of bacterial Eucalyptus grandis trees in Uruguay commonly exhibit symptoms of leaf blight and dieback disease. The cause ananatis, the causal agent of bacterial blight and dieback on Eucalyptus in South Africa (Coutin- ho et al

  6. Schematic structure of nitrogen-doped graphene showing carbon

    E-Print Network [OSTI]

    Gong, Jian Ru

    method for graphene doping, and is compatible with current complementary metal oxide semiconductor (CMOSSchematic structure of nitrogen- doped graphene showing carbon (gray) and nitrogen (blue) NPG Asia Materials research highlight | doi:10.1038/asiamat.2010.204 Published online 13 December 2010 Graphene

  7. Modeling Feat Sheds Light on Protein Channel's Function

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

    translocon channel (green), which is embedded in the cell membrane (yellow, white). Proteins that are inserted via the ribosome into the channel can either be laterally...

  8. USING CORONAL CELLS TO INFER THE MAGNETIC FIELD STRUCTURE AND CHIRALITY OF FILAMENT CHANNELS

    SciTech Connect (OSTI)

    Sheeley, N. R. Jr.; Warren, H. P.; Martin, S. F.; Panasenco, O.

    2013-08-01

    Coronal cells are visible at temperatures of {approx}1.2 MK in Fe XII coronal images obtained from the Solar Dynamics Observatory and Solar Terrestrial Relations Observatory spacecraft. We show that near a filament channel, the plumelike tails of these cells bend horizontally in opposite directions on the two sides of the channel like fibrils in the chromosphere. Because the cells are rooted in magnetic flux concentrations of majority polarity, these observations can be used with photospheric magnetograms to infer the direction of the horizontal field in filament channels and the chirality of the associated magnetic field. This method is similar to the procedure for inferring the direction of the magnetic field and the chirality of the fibril pattern in filament channels from H{alpha} observations. However, the coronal cell observations are easier to use and provide clear inferences of the horizontal field direction for heights up to {approx}50 Mm into the corona.

  9. Modeling, Real-Time Estimation, and Identification of UWB Indoor Wireless Channels

    SciTech Connect (OSTI)

    Olama, Mohammed M [ORNL] [ORNL; Djouadi, Seddik M [ORNL] [ORNL; Li, Yanyan [ORNL] [ORNL; Fathy, Aly [University of Tennessee (UT)] [University of Tennessee (UT)

    2013-01-01

    In this paper, stochastic differential equations (SDEs) are used to model ultrawideband (UWB) indoor wireless channels. We show that the impulse responses for time-varying indoor wireless channels can be approximated in a mean square sense as close as desired by impulse responses that can be realized by SDEs. The state variables represent the inphase and quadrature components of the UWB channel. The expected maximization and extended Kalman filter are employed to recursively identify and estimate the channel parameters and states, respectively, from online received signal strength measured data. Both resolvable and non-resolvable multipath received signals are considered and represented as small-scaled Nakagami fading. The proposed models together with the estimation algorithm are tested using UWB indoor measurement data demonstrating the method s viability and the results are presented.

  10. Along channel distance [km] Salinity [psu

    E-Print Network [OSTI]

    at estuaries that have already seen the effects of tectonically induced sea level rise, scientists have been -- that is the upper intertidal mudflats and salt marsh edge -- while the decreased drag on the channel bed leads

  11. Scripps Channel 2 | Open Energy Information

    Open Energy Info (EERE)

    Co-located facilities 10.5m Salt Water Deep TankFlume2nd Wave ChannelPressure Test VesselsTemperature-Pressure Calibration Facility Specializations, Capabilities, and Key...

  12. Message passing with queues and channels

    SciTech Connect (OSTI)

    Dozsa, Gabor J; Heidelberger, Philip; Kumar, Sameer; Ratterman, Joseph D; Steinmacher-Burow, Burkhard; Wisniewski, Robert W

    2013-09-24

    In an embodiment, a send thread receives an identifier that identifies a destination node and a pointer to data. The send thread creates a first send request in response to the receipt of the identifier and the data pointer. The send thread selects a selected channel from among a plurality of channels. The selected channel comprises a selected hand-off queue and an identification of a selected message unit. Each of the channels identifies a different message unit. The selected hand-off queue is randomly accessible. If the selected hand-off queue contains an available entry, the send thread adds the first send request to the selected hand-off queue. If the selected hand-off queue does not contain an available entry, the send thread removes a second send request from the selected hand-off queue and sends the second send request to the selected message unit.

  13. On the capacity of bosonic channels

    E-Print Network [OSTI]

    Blake, Christopher Graham

    2011-01-01

    The capacity of the bosonic channel with additive Gaussian noise is unknown, but there is a known lower bound that is conjectured to be the capacity. We have quantified the gap that exists between this known achievable ...

  14. Fair resource allocation in multiple access channels

    E-Print Network [OSTI]

    ParandehGheibi, Ali

    2008-01-01

    We consider the problem of resource allocation in a multiple access channel. Our objective is to obtain rate and power allocation policies that maximize a general concave utility function of average transmission rates over ...

  15. Optimal bandwidth allocation in a delay channel

    E-Print Network [OSTI]

    Ehsan, Navid; Liu, Mingyan

    2006-01-01

    following cost function: latest allocation will not make anyslot allocation problem, if the cost , then: function 1) forALLOCATION IN A DELAY CHANNEL If represents the value function

  16. Multi-channel coded-aperture photography

    E-Print Network [OSTI]

    Baek, Jongmin

    2008-01-01

    This thesis describes the multi-channel coded-aperture photography, a modified camera system that can extract an all-focus image of the scene along with a depth estimate over the scene. The modification consists of inserting ...

  17. Automatic Quantification of Cache Side-Channels

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Automatic Quantification of Cache Side-Channels Boris K¨opf1 , Laurent Mauborgne1 , and Mart. In this paper we propose a novel method for automatically deriving upper bounds on the amount of information

  18. Optimal Distributed Beamforming for MISO Interference Channels 

    E-Print Network [OSTI]

    Qiu, Jiaming

    2012-07-16

    In this thesis, the problem of quantifying the Pareto optimal boundary of the achievable rate region is considered over multiple-input single-output(MISO)interference channels, where the problem boils down to solving a sequence of convex feasibility...

  19. Secretary Chu Speaks at the 2010 Washington Auto Show

    SciTech Connect (OSTI)

    Secretary Chu

    2010-02-03

    Secretary Chu lays out a roadmap for how the U.S. can lead the world in making the clean vehicles we need at the 2010 Washington Auto Show. He also announced that the Department of Energy had closed on a $1.4 billion loan to Nissan to build the all-electric LEAF in Tennessee and create up to 1,300 American jobs.

  20. Secretary Chu Speaks at the 2010 Washington Auto Show

    ScienceCinema (OSTI)

    Secretary Chu

    2010-09-01

    Secretary Chu lays out a roadmap for how the U.S. can lead the world in making the clean vehicles we need at the 2010 Washington Auto Show. He also announced that the Department of Energy had closed on a $1.4 billion loan to Nissan to build the all-electric LEAF in Tennessee and create up to 1,300 American jobs.

  1. Interactive Map Shows Geothermal Resources | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankADVANCED MANUFACTURING OFFICE INDUSTRIAL TECHNICAL8-02Department ofInversionsInteractive Map Shows

  2. Extracting Effective Higgs Couplings in the Golden Channel

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

    Chen, Yi; Vega-Morales, Roberto

    2014-04-08

    Kinematic distributions in Higgs decays to four charged leptons, the so called ‘golden channel, are a powerful probe of the tensor structure of its couplings to neutral electroweak gauge bosons. In this study we construct the first part of a comprehensive analysis framework designed to maximize the information contained in this channel in order to perform direct extraction of the various possible Higgs couplings. We first complete an earlier analytic calculation of the leading order fully differential cross sections for the golden channel signal and background to include the 4e and 4? final states with interference between identical final states.more »We also examine the relative fractions of the different possible combinations of scalar-tensor couplings by integrating the fully differential cross section over all kinematic variables as well as show various doubly differential spectra for both the signal and background. From these analytic expressions we then construct a ‘generator level’ analysis framework based on the maximum likelihood method. Then, we demonstrate the ability of our framework to perform multi-parameter extractions of all the possible effective couplings of a spin-0 scalar to pairs of neutral electroweak gauge bosons including any correlations. Furthermore, this framework provides a powerful method for study of these couplings and can be readily adapted to include the relevant detector and systematic effects which we demonstrate in an accompanying study to follow.« less

  3. JSON shows incomplete info | OpenEI Community

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX E LISTStar2-0057-EAInvervar Hydro Jump to: navigation,Jump to:Corp JumpJSON shows

  4. Dynein Motor Domain Shows Ring-Shaped Motor, Buttress

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit theCovalentLaboratory |Sectorfor $1.14Dynein Motor Domain Shows

  5. Dynein Motor Domain Shows Ring-Shaped Motor, Buttress

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit theCovalentLaboratory |Sectorfor $1.14Dynein Motor Domain ShowsDynein

  6. Can p-channel tunnel field-effect transistors perform as good as n-channel?

    SciTech Connect (OSTI)

    Verhulst, A. S. Pourghaderi, M. A.; Collaert, N.; Thean, A. V.-Y.; Verreck, D.; Van de Put, M.; Groeseneken, G.; Sorée, B.

    2014-07-28

    We show that bulk semiconductor materials do not allow perfectly complementary p- and n-channel tunnel field-effect transistors (TFETs), due to the presence of a heavy-hole band. When tunneling in p-TFETs is oriented towards the gate-dielectric, field-induced quantum confinement results in a highest-energy subband which is heavy-hole like. In direct-bandgap IIIV materials, the most promising TFET materials, phonon-assisted tunneling to this subband degrades the subthreshold swing and leads to at least 10× smaller on-current than the desired ballistic on-current. This is demonstrated with quantum-mechanical predictions for p-TFETs with tunneling orthogonal to the gate, made out of InP, In{sub 0.53}Ga{sub 0.47}As, InAs, and a modified version of In{sub 0.53}Ga{sub 0.47}As with an artificially increased conduction-band density-of-states. We further show that even if the phonon-assisted current would be negligible, the build-up of a heavy-hole-based inversion layer prevents efficient ballistic tunneling, especially at low supply voltages. For p-TFET, a strongly confined n-i-p or n-p-i-p configuration is therefore recommended, as well as a tensily strained line-tunneling configuration.

  7. Passive states optimize the output of bosonic Gaussian quantum channels

    E-Print Network [OSTI]

    Giacomo De Palma; Dario Trevisan; Vittorio Giovannetti

    2015-11-01

    An ordering between the quantum states emerging from a single mode gauge-covariant bosonic Gaussian channel is proven. Specifically, we show that within the set of input density matrices with the same given spectrum, the element passive with respect to the Fock basis (i.e. diagonal with decreasing eigenvalues) produces an output which majorizes all the other outputs emerging from the same set. When applied to pure input states, our finding includes as a special case the result of A. Mari, et al., Nat. Comm. 5, 3826 (2014) which implies that the output associated to the vacuum majorizes the others.

  8. Quatum Thermodynamics and the coherence in Ion channels

    E-Print Network [OSTI]

    Samyadeb Bhattacharya; Sisir Roy

    2013-05-02

    We showed that quantum mechanical superposition can sustain in the process of ion transfer in protein membrane for a substantial period, in spite of the presence of the interactions with environmental modes of molecular vibration. The spectral temperature, as defined in quantum thermodynamical framework plays a significant role in maintaining the coherence. The ratio of decoherence time and dwell time has been calculated, which can be directly related to the degree of coherence. The results shead new light to build quantum information system of entangled ionic states in the voltage gated biological channels.

  9. Multi-Keyhole MIMO Channels: Asymptotic Analysis of Outage Capacity

    E-Print Network [OSTI]

    Loyka, Sergey

    Multi-Keyhole MIMO Channels: Asymptotic Analysis of Outage Capacity George Levin and Sergey Loyka single-keyhole channels. The outage capacity distribution of both full-rank and rank-deficient multi channel, outage capacity, correlation. I. INTRODUCTION Multiple-Input-Multiple-Output (MIMO) channels have

  10. FLUID: Improving Throughputs in Enterprise Wireless LANs through Flexible Channelization

    E-Print Network [OSTI]

    Liblit, Ben

    the usefulness of flexible channels in the context of 802.11-based networks. Current 802.11 hardware can provideFLUID: Improving Throughputs in Enterprise Wireless LANs through Flexible Channelization Shravan for designing 802.11 wireless LANs (WLANs) using flexible channelization -- the choice of an appropriate channel

  11. Multiple description source coding for mobile radio channels 

    E-Print Network [OSTI]

    Pegnyemb, Telesphore Bertrand

    1999-01-01

    The topic of this thesis is the transmission of a memoryless source over a slow fading channel. It should be noted that when a channel is specified as a slow fading channel, it does not specify whether the channel is flat ...

  12. Measuring Political Polarization: Twitter shows the two sides of Venezuela

    E-Print Network [OSTI]

    Morales, A J; Losada, J C; Benito, R M

    2015-01-01

    We say that a population is perfectly polarized when divided in two groups of the same size and opposite opinions. In this paper, we propose a methodology to study and measure the emergence of polarization from social interactions. We begin by proposing a model to estimate opinions in which a minority of influential individuals propagate their opinions through a social network. The result of the model is an opinion probability density function. Next, we propose an index to quantify the extent to which the resulting distribution is polarized. Finally, we apply the proposed methodology to a Twitter conversation about the late Venezuelan president, Hugo Ch\\'avez, finding a good agreement between our results and offline data. Hence, we show that our methodology can detect different degrees of polarization, depending on the structure of the network.

  13. Outage Analysis for MIMO Rician Channels and Channels with Partial CSI

    E-Print Network [OSTI]

    Lee, Yong Hoon

    Outage Analysis for MIMO Rician Channels and Channels with Partial CSI Won-Yong Shin, Sae the outage performance and diversity- multiplexing tradeoff (DMT), originally introduced by Zheng and Tse (CSIT). The asymptotic behaviors of the outage are analyzed in the limit of high signal-to-noise ratio

  14. Optimal Skewed Data Allocation on Multiple Channels with Flat Broadcast per Channel

    E-Print Network [OSTI]

    Pinotti, Maria Cristina

    to a large number of clients. Consider data services on cellular networks, such as stock quotes, weather info. In this scenario, a server at the base-station repeatedly transmits data items from a given set over a wirelessOptimal Skewed Data Allocation on Multiple Channels with Flat Broadcast per Channel Elia Ardizzoni

  15. Source-channel Coding for Gaussian Sources Over a Gaussian Multiple Access Channel

    E-Print Network [OSTI]

    Sharma, Vinod

    extended in [19] to the system with side information and distortion. The distributed Gaussian source codingSource-channel Coding for Gaussian Sources Over a Gaussian Multiple Access Channel R Rajesh and Vinod Sharma Dept. of Electrical Communication Engg. Indian Institute of Science Bangalore, India Email

  16. Combining EMD with ICA for Extracting Independent Sources from Single Channel and Two-Channel Data

    E-Print Network [OSTI]

    Separation (BSS) techniques are frequently needed in the processing of biomedical signals. This need comes-channel biosignal processing. I. INTRODUCTION In the field of biomedical signal processing, independent sources is very prominent in this case. An example of processing 2-channel signals is EEG signal processing

  17. History dependent dynamics in a generic model of ion channels - an analytic study

    E-Print Network [OSTI]

    Daniel Soudry; Ron Meir

    2010-04-28

    Recent experiments have demonstrated that the timescale of adaptation of single neurons and ion channel populations to stimuli slows down as the length of stimulation increases; in fact, no upper bound on temporal time-scales seems to exist in such systems. Furthermore, patch clamp experiments on single ion channels have hinted at the existence of large, mostly unobservable, inactivation state spaces within a single ion channel. This raises the question of the relation between this multitude of inactivation states and the observed behavior. In this work we propose a minimal model for ion channel dynamics which does not assume any specific structure of the inactivation state space. The model is simple enough to render an analytical study possible. This leads to a clear and concise explanation of the experimentally observed exponential history-dependent relaxation in sodium channels in a voltage clamp setting, and shows that their recovery rate from slow inactivation must be voltage dependent. Furthermore, we predict that history-dependent relaxation cannot be created by overly sparse spiking activity. While the model was created with ion channel populations in mind, its simplicity and genericalness render it a good starting point for modeling similar effects in other systems, and for scaling up to higher levels such as single neurons which are also known to exhibit multiple time scales.

  18. Single- and coupled-channel radial inverse scattering with supersymmetric transformations

    E-Print Network [OSTI]

    Daniel Baye; Jean-Marc Sparenberg; Andrey M Pupasov-Maksimov; Boris F Samsonov

    2014-06-13

    The present status of the coupled-channel inverse-scattering method with supersymmetric transformations is reviewed. We first revisit in a pedagogical way the single-channel case, where the supersymmetric approach is shown to provide a complete solution to the inverse-scattering problem. A special emphasis is put on the differences between conservative and non-conservative transformations. In particular, we show that for the zero initial potential, a non-conservative transformation is always equivalent to a pair of conservative transformations. These single-channel results are illustrated on the inversion of the neutron-proton triplet eigenphase shifts for the S and D waves. We then summarize and extend our previous works on the coupled-channel case and stress remaining difficulties and open questions. We mostly concentrate on two-channel examples to illustrate general principles while keeping mathematics as simple as possible. In particular, we discuss the difference between the equal-threshold and different-threshold problems. For equal thresholds, conservative transformations can provide non-diagonal Jost and scattering matrices. Iterations of such transformations are shown to lead to practical algorithms for inversion. A convenient technique where the mixing parameter is fitted independently of the eigenphases is developed with iterations of pairs of conjugate transformations and applied to the neutron-proton triplet S-D scattering matrix, for which exactly-solvable matrix potential models are constructed. For different thresholds, conservative transformations do not seem to be able to provide a non-trivial coupling between channels. In contrast, a single non-conservative transformation can generate coupled-channel potentials starting from the zero potential and is a promising first step towards a full solution to the coupled-channel inverse problem with threshold differences.

  19. Pair creation in heavy ion channeling

    E-Print Network [OSTI]

    Nikolay A. Belov; Zoltán Harman

    2014-11-20

    Heavy ions channeling through crystals with multi-GeV kinetic energies can create electron-positron pairs. In the framework of the ion, the energy of virtual photons arising from the periodic crystal potential may exceed the threshold $2mc^2$. The repeated periodic collisions with the crystal ions yield high pair production rates. When the virtual photon frequency matches a nuclear transition in the ion, the production rate can be resonantly increased. In this two-step excitation-pair conversion scheme, the excitation rates are coherently enhanced, and they scale approximately quadratically with the number of crystal sites along the channel.

  20. Digitally Assisted Multi-Channel Receivers 

    E-Print Network [OSTI]

    Pentakota, Krishna Anand Santosh Spikanth

    2011-10-21

    and it is shown that the sinc filter banks have very low computational complexity in data estimation Nextly, analytical tools for the design of clock-jitter tolerant multi-channel filter- bank receivers have been developed. Clock-jitter is one of the most... fundamental obstacles for the future generation of wideband receivers. Additionally all the trade-offs and specifications of a design example for a multi-channel receiver that can process a 5 GHz baseband signal with 40 dB of signal-to-noise-ratio (SNR...

  1. Constructing monotones for quantum phase references in totally dephasing channels

    SciTech Connect (OSTI)

    Toloui, Borzu; Sanders, Barry C. [Institute for Quantum Information Science, University of Calgary, Alberta T2N 1N4 (Canada); Gour, Gilad [Institute for Quantum Information Science, University of Calgary, Alberta T2N 1N4 (Canada); Department of Mathematics and Statistics, University of Calgary, Alberta T2N 1N4 (Canada)

    2011-08-15

    Restrictions on quantum operations give rise to resource theories. Total lack of a shared reference frame for transformations associated with a group G between two parties is equivalent to having, in effect, an invariant channel between the parties and a corresponding superselection rule. The resource associated with the absence of the reference frame is known as ''frameness'' or ''asymmetry.'' We show that any entanglement monotone for pure bipartite states can be adapted as a pure-state frameness monotone for phase-invariant channels [equivalently U(1) superselection rules] and extended to the case of mixed states via the convex-roof extension. As an application, we construct a family of concurrence monotones for U(1) frameness for general finite-dimensional Hilbert spaces. Furthermore, we study ''frameness of formation'' for mixed states analogous to entanglement of formation. In the case of a qubit, we show that it can be expressed as an analytical function of the concurrence analogously to the Wootters formula for entanglement of formation. Our results highlight deep links between entanglement and frameness resource theories.

  2. Plasma channel and Z-pinch dynamics for heavy ion transport

    SciTech Connect (OSTI)

    Ponce-Marquez, David

    2002-07-09

    A self stabilized, free standing, z-pinch plasma channel has been proposed to deliver the high intensity heavy ion beam from the end of a driver to the fuel target in a heavy ion inertial fusion power plant. The z-pinch relaxes emittance and energy spread requirements requiring a lower cost driver. A z-pinch transport would reduce the number of beam entry port holes to the target chamber from over a hundred to four as compared to neutralized ballistic focusing thus reducing the driver hardware exposure to neutron flux. Experiments where a double pulse discharge technique is used, z-pinch plasma channels with enhanced stability are achieved. Typical parameters are 7 kV pre-pulse discharge and 30 kV main bank discharge with 50 kA of channel current in a 7 torr background gas atmosphere. This work is an experimental study of these plasma channels examining the relevant physics necessary to understand and model such plasmas. Laser diagnostics measured the dynamical properties of neutrals and plasma. Schlieren and phase contrast techniques probe the pre-pulse gas dynamics and infrared interferometry and faraday effect polarimetry are used on the z-pinch to study its electron density and current distribution. Stability and repeatability of the z-pinch depend on the initial conditions set by the pre-pulse. Results show that the z-pinch channel is wall stabilized by an on-axis gas density depression created by the pre-pulse through hydrodynamic expansion where the ratio of the initial gas density to the final gas density is > 10/1. The low on-axis density favors avalanching along the desired path for the main bank discharge. Pinch time is around 2 s from the main bank discharge initiation with a FWHM of {approx} 2 cm. Results also show that typical main bank discharge plasma densities reach 10{sup 17} cm{sup -3} peak on axis for a 30 kV, 7 torr gas nitrogen discharge. Current rise time is limited by the circuit-channel inductance with the highest contribution to the impedance due to the plasma. There is no direct evidence of surface currents due to high frequency skin effects and magnetic field experiments indicate that > 70% of the current carried by the channel is enclosed within FWHM of the channel. Code-experiment benchmark comparisons show that simulations capture the main mechanisms of the channel evolution, but complete atomic models need to be incorporated.

  3. Analysis of an LMS Linear Equalizer for Fading Channels in Decision Directed mode

    E-Print Network [OSTI]

    Sharma, Vinod

    Analysis of an LMS Linear Equalizer for Fading Channels in Decision Directed mode Veeraruna Kavitha varying wireless fading chan- nel, equalized by an LMS linear equalizer in decision directed mode (DD-LMS using an ODE (Ordinary Differential Equation) approximating the DD-LMS-LE. We also show, via examples

  4. Outage Probability for Free-Space Optical Systems Over Slow Fading Channels With Pointing Errors

    E-Print Network [OSTI]

    Hranilovic, Steve

    Outage Probability for Free-Space Optical Systems Over Slow Fading Channels With Pointing Errors, Canada. Email: farid@grads.ece.mcmaster.ca, hranilovic@mcmaster.ca Abstract-- We investigate the outage errors. An expression for the outage probability is derived and we show that optimizing the transmit- ted

  5. On Secrecy Outage Capacity of Fading Channels Under Relaxed Delay Constraints

    E-Print Network [OSTI]

    Koksal, Can Emre

    On Secrecy Outage Capacity of Fading Channels Under Relaxed Delay Constraints Onur Gungor, Can Emre delay constraints. More specif- ically, we extend the definition of outage secrecy capacity for single, we provide bounds on secrecy outage capacity with k + 1 block delay constraint. We show

  6. Joint Power Control and Beamforming Codebook Design for MISO Channels under the Outage

    E-Print Network [OSTI]

    Yu, Wei

    Joint Power Control and Beamforming Codebook Design for MISO Channels under the Outage Criterion is formulated as the minimization of the outage probability subject to the transmit power constraint beamforming and power codebook sizes. We show that as the outage probability decreases, optimal joint design

  7. Remote control of ion channels and neurons through magnetic-field heating of nanoparticles

    E-Print Network [OSTI]

    Ferkey, Denise

    Remote control of ion channels and neurons through magnetic-field heating of nanoparticles Heng stimulation1­3 has begun to unravel the neur- onal processing that controls certain animal behaviours4. Here, we show an approach based on radio-frequency magnetic-field heating of nanoparticles to remotely

  8. Heat transfer characteristics of a two-pass trapezoidal channel and a novel heat pipe 

    E-Print Network [OSTI]

    Lee, Sang Won

    2009-06-02

    and roughened two-pass trapezoidal channels with a 180° turn over a range of Reynolds numbers between about 10,000 and 60,000. The naphthalene sublimation technique and the heat and mass transfer analogy were applied. The results showed that there was a very...

  9. Performance Analysis of UDP with Energy Efficient Link Layer on Markov Fading Channels

    E-Print Network [OSTI]

    Chockalingam, A.

    Performance Analysis of UDP with Energy Efficient Link Layer on Markov Fading Channels P. M. Soni Communication Engineering Indian Institute of Science, Bangalore 560012, INDIA Abstract--- Backoff algorithms in wireless user terminals. We an­ alyzed the energy efficiency performance and showed that, on slowly fad

  10. Fuel cell collector plates with improved mass transfer channels

    DOE Patents [OSTI]

    Gurau, Vladimir (Miami, FL); Barbir, Frano (Palm Beach Gardens, FL); Neutzler, Jay K. (Palm Beach Gardens, FL)

    2003-04-22

    A fuel cell collector plate can be provided with one or more various channel constructions for the transport of reactants to the gas diffusion layer and the removal of water therefrom. The outlet channel can be arranged to have a reduced volume compared to the inlet channel, in both interdigitated and discontinuous spiral applications. The land width between an inlet channel and outlet channel can be reduced to improved mass flow rate in regions of deleted reactant concentrations. Additionally or alternatively, the depth of the inlet channel can be reduced in the direction of flow to reduce the diffusion path as the concentration of reactant is reduced.

  11. On Cryptographic Primitives Based on Noisy Channels

    E-Print Network [OSTI]

    Morozov, Kirill

    based on BSC is also analysed in the non- asymptotic case. We derive relations for the failure- cation is valid hereby preparing a ground for our results concerning OT based on Unfair Noisy Channels (UNC). In contrast to the noise models mentioned above, a corrupted party is given a partial control

  12. On Cryptographic Primitives Based on Noisy Channels

    E-Print Network [OSTI]

    Morozov, Kirill

    based on BSC is also analysed in the non­ asymptotic case. We derive relations for the failure­ cation is valid hereby preparing a ground for our results concerning OT based on Unfair Noisy Channels (UNC). In contrast to the noise models mentioned above, a corrupted party is given a partial control

  13. Channel Routing for Integrated Optics Christopher Condrat

    E-Print Network [OSTI]

    Kalla, Priyank

    Channel Routing for Integrated Optics Christopher Condrat (chris@g6net.com) Priyank Kalla (kalla, Salt Lake City, UT, USA Abstract--Increasing scope and applications of integrated optics necessitates the development of automated techniques for physical design of optical systems. This paper presents an automated

  14. Variational Bayesian Blind and Semiblind Channel Estimation

    E-Print Network [OSTI]

    Gesbert, David

    elaborate the details for the case of MIMO OFDM systems. I. INTRODUCTION Blind and semiblind channel, SFR , Orange, STEricsson, Cisco, BMW Group , SAP, Monaco Telecom and Symantec. The research reported herein has also been partially supported by the European FP7 NoE NewCom++ and FET project CROWN

  15. Transformer Recharging with Alpha Channeling in Tokamaks

    SciTech Connect (OSTI)

    N.J. Fisch

    2009-12-21

    Transformer recharging with lower hybrid waves in tokamaks can give low average auxiliary power if the resistivity is kept high enough during the radio frequency (rf) recharging stage. At the same time, operation in the hot ion mode via alpha channeling increases the effective fusion reactivity. This paper will address the extent to which these two large cost saving steps are compatible. __________________________________________________

  16. Study of transport properties in rippled channels

    E-Print Network [OSTI]

    Ivan Herrera; Alberto Mendoza; Eduardo S. Tututi

    2005-10-16

    We study dynamical properties of bouncing particles inside of channels with sinusoidal walls. Taking as parameters the amplitude and the phases between the walls we study the transmitivity and its dependence on these parameters. We find an analytical approximation for transmitivity for small amplitudes, which is corroborated by numerical calculation.

  17. 4882 IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 62, NO. 18, SEPTEMBER 15, 2014 Low-Sampling-Rate Ultra-Wideband Channel

    E-Print Network [OSTI]

    Al-Naffouri, Tareq Y.

    -Naffouri, Member, IEEE Abstract--In this paper, a low-sampling-rate scheme for ultra-wideband channel estimation. The results show that high reduction in sampling rate can be achieved. The proposed estimator outper- forms estimator. In addition to channel estimation, a synchronization method is also proposed that utilizes

  18. Influence of vertical channel change associated with wood accumulations on delineating channel migration zones,

    E-Print Network [OSTI]

    Montgomery, David R.

    debris (LWD); Logjam; Channel avulsion 1. Introduction The interaction of large woody debris (LWD., 2001). Larger, unconfined river systems are capable of organizing LWD into stable structures that can

  19. A 128-channel picoammeter system and its application on charged particle beam current distribution measurements

    E-Print Network [OSTI]

    Yu, Deyang; Xue, Yingli; Zhang, Mingwu; Cai, Xiaohong; Hu, Jianjun; Dong, Jinmei; Li, Xin

    2015-01-01

    A 128-channel picoammeter system is constructed based on instrumentation amplifiers. Taking the advantages of high electric potential and narrow bandwidth in DC energetic charged beam measurements, current resolution better than 5 fA can be achieved. Two 128-channel Faraday cup arrays are built, and are employed for ion and electron beam current distribution measurements. Tests with 60 keV O3+ ions and 2 keV electrons show that it can provide exact boundaries when a positive charged particle beam current distribution is measured.

  20. Hog Show 

    E-Print Network [OSTI]

    2009-01-01

    STATION . AGRICULTURAL AND MECHANICAL COLLEGE OF TEXAS W. B. BIZZELL. Preefdent BULLETIN NO. 286 JANUARY, 1922 DIVISION OF ANIMAL INDUSTRY RICE BRAN FOR FATTENING HOGS I - B. YOUNGBLOOD, DIRECTOR, 30LLEOE STATION, BRAZOS COUNTY, TEXAS STATION... of Veterinary Medicine, A. and M. College of Texas. **In cooperation with United States Department of Agriculture. RICE BRAN FOR FATTENING HOGS. PART I Feeding Value of Rice Bran When Fed in Various Com- binations with Corn Chops and Tankage. PART 11...

  1. Hog Show 

    E-Print Network [OSTI]

    2009-01-01

    STATION AGRICULTU~AL AND MECHANICAL COLLEGE OF TEXAS W. B. BIZZELL, President - BULLETIN NO. 242 MARCH, 1919 DIVISION OF ANIMAL INDUSTRY Hardening Peanut-Fed Hogs B. YOUNGBLOOD, DIRECTOR College Station, Brazos County, Texas / I STATION STAFF... of Agriculture. Objec Plan - - CONTENTS PAGE :ts .................................................... 5 of experiment .......................................... 5 Feeding results . . . . . . . . . . . . . . . . . . . . ... 6 Hogs sold guaranteed...

  2. Light Show

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverseIMPACTThousand CubicResourcelogo and-E C H N13, 2009LienertProducts,

  3. Transmission Policies for Asymmetric Interference Channels with Energy Harvesting Nodes

    E-Print Network [OSTI]

    Yener, Aylin

    Transmission Policies for Asymmetric Interference Channels with Energy Harvesting Nodes Kaya power policies to maximize sum capacity in an energy harvesting setting. It is shown derive optimal power allocation policies for interference channels comprised of energy harvesting

  4. Evaluating demand planning strategy in the retail channel

    E-Print Network [OSTI]

    Zehavi, Limor (Limor Hadas)

    2012-01-01

    In 2007 Dell began selling through the retail channel. Five years later, the retail channel is still in the early stages relative to competitors and is growing rapidly. Short product lifecycles, long lead times and a high ...

  5. Bedrock channel response to tetonic, climatic and eustatic forcings

    E-Print Network [OSTI]

    Snyder, Noah P

    2001-01-01

    The response of bedrock channels to external forcings is investigated in this thesis. The approach is to test and constrain a theoretical model for bedrock-channel incision based on shear stress using field data. The primary ...

  6. Defending against side-channel attacks : DynamoREA

    E-Print Network [OSTI]

    Wen, David, M. Eng. (David Y.). Massachusetts Institute of Technology

    2011-01-01

    Modern computer architectures are prone to leak information about their applications through side-channels caused by micro-architectural side-effects. Through these side-channels, attackers can launch timing attacks by ...

  7. Queueing Behavior over a Gilbert-Elliott Packet Erasure Channel 

    E-Print Network [OSTI]

    Cai, Yi

    2012-02-14

    This thesis explores the queueing performance of a wireless communication system that transmits packets over a correlated erasure channel using the IEEE 802.11 protocol suit. The channel states and the queue length together form a Markov chain...

  8. Adaptive versus nonadaptive strategies for quantum channel discrimination

    E-Print Network [OSTI]

    Harrow, Aram W.

    We provide a simple example that illustrates the advantage of adaptive over nonadaptive strategies for quantum channel discrimination. In particular, we give a pair of entanglement-breaking channels that can be perfectly ...

  9. Fabrication of 10 nm enclosed nanofluidic channels and Zhaoning Yu

    E-Print Network [OSTI]

    - tively large planar surfaces and provide an effective seal. Wafer bonding requires an absolutely defect-density arrays of nanofluidic channels were first fabricated using NIL. The NIL mold was generated channels on the mold generated

  10. Gallager's exponent for MIMO channels: A reliability-rate tradeoff

    E-Print Network [OSTI]

    Shin, Hyundong

    In this paper, we derive Gallager's random coding error exponent for multiple-input multiple-output (MIMO) Rayleigh block-fading channels, assuming no channel-state information (CSI) at the transmitter and perfect CSI at ...

  11. Analysis of global channel costs for the pharmaceutical industry

    E-Print Network [OSTI]

    Rimling, Eric C. (Eric Christopher)

    2009-01-01

    The pharmaceutical industry creates products which often have more than one supply chain channel, defined as a route through the supply chain network from sourcing to the end market. Each channel's specific cost characteristics ...

  12. Channel Meander Migration in Large-Scale Physical Model Study 

    E-Print Network [OSTI]

    Yeh, Po Hung

    2010-10-12

    A set of large-scale laboratory experiments were conducted to study channel meander migration. Factors affecting the migration of banklines, including the ratio of curvature to channel width, bend angle, and the Froude number were tested...

  13. Variations on the Gaussian Multiple-Access Channel Alfonso Martinez

    E-Print Network [OSTI]

    energy channel (AE-Q). The alternative models we study are non-coherent, in the sense that information channel, including a multiple-access sce- nario, was studied by Verd´u [1]. We establish a correspondence

  14. Mathematical approach to channel codes with a diagonal matrix structure 

    E-Print Network [OSTI]

    Mitchell, David G. M.

    2009-01-01

    Digital communications have now become a fundamental part of modern society. In communications, channel coding is an effective way to reduce the information rate down to channel capacity so that the information can be ...

  15. Opposing Shear-Induced Forces Dominate Inertial Focusing in Curved Channels and High Reynolds Numbers

    E-Print Network [OSTI]

    Keinan, Eliezer; Nahmias, Yaakov

    2015-01-01

    Inertial focusing is the migration of particles in fluid toward equilibrium, where current theory predicts that shear-induced and wall-induced lift forces are balanced. First reported in 1961, this Segre-Silberberg effect is particularly useful for microfluidic isolation of cells and particles. Interestingly, recent work demonstrated particle focusing at high Reynolds numbers that cannot be explained by current theory. In this work, we show that non-monotonous velocity profiles, such as those developed in curved channels, create peripheral velocity maxima around which opposing shear-induced forces dominate over wall effects. Similarly, entry effects amplified in high Reynolds flow produce an equivalent trapping mechanism in short, straight channels. This new focusing mechanism in the developing flow regime enables a 10-fold miniaturization of inertial focusing devices, while our model corrects long-standing misconceptions about the nature of mechanical forces governing inertial focusing in curved channels.

  16. Quantum phase communication channels in the presence of static and dynamical phase diffusion

    E-Print Network [OSTI]

    Jacopo Trapani; Berihu Teklu; Stefano Olivares; Matteo G. A. Paris

    2015-05-12

    We address quantum communication channels based on phase modulation of coherent states and analyze in details the effects of static and dynamical (stochastic) phase diffusion. We evaluate mutual information for an ideal phase receiver and for a covariant phase-space-based receiver, and compare their performances by varying the number of symbols in the alphabet and/or the overall energy of the channel. Our results show that phase communication channels are generally robust against phase noise, especially for large alphabets in the low energy regime. In the presence of dynamical (non-Markovian) noise the mutual information is preserved by the time correlation of the environment, and when the noise spectra is detuned with respect to the information carrier, revivals of mutual information appears.

  17. Energetics of ion competition in the DEKA selectivity filter of neuronal sodium channels

    E-Print Network [OSTI]

    D. Boda; G. Leaf; J. Fonseca; B. Eisenberg

    2015-04-03

    The energetics of ionic selectivity in the neuronal sodium channels is studied. A simple model constructed for the selectivity filter of the channel is used. The selectivity filter of this channel type contains aspartate (D), glutamate (E), lysine (K), and alanine (A) residues (the DEKA locus). We use Grand Canonical Monte Carlo simulations to compute equilibrium binding selectivity in the selectivity filter and to obtain various terms of the excess chemical potential from a particle insertion procedure based on Widom's method. We show that K$^{+}$ ions in competition with Na$^{+}$ are efficiently excluded from the selectivity filter due to entropic hard sphere exclusion. The dielectric constant of protein has no effect on this selectivity. Ca$^{2+}$ ions, on the other hand, are excluded from the filter due to a free energetic penalty which is enhanced by the low dielectric constant of protein.

  18. Resonant behaviour of an oscillating wave energy converter in a channel

    E-Print Network [OSTI]

    E. Renzi; F. Dias

    2012-04-10

    A mathematical model is developed to study the behaviour of an oscillating wave energy converter in a channel. During recent laboratory tests in a wave tank, peaks in the hydrodynamic actions on the converter occurred at certain frequencies of the incident waves. This resonant mechanism is known to be generated by the transverse sloshing modes of the channel. Here the influence of the channel sloshing modes on the performance of the device is further investigated. Within the framework of a linear inviscid potential-flow theory, application of the Green theorem yields a hypersingular integral equation for the velocity potential in the fluid domain. The solution is found in terms of a fast-converging series of Chebyshev polynomials of the second kind. The physical behaviour of the system is then analysed, showing sensitivity of the resonant sloshing modes to the geometry of the device, that concurs in increasing the maximum efficiency. Analytical results are validated with available numerical and experimental data.

  19. Resonant behaviour of an oscillating wave energy converter in a channel

    E-Print Network [OSTI]

    Renzi, E

    2012-01-01

    A mathematical model is developed to study the behaviour of an oscillating wave energy converter in a channel. During recent laboratory tests in a wave tank, peaks in the hydrodynamic actions on the converter occurred at certain frequencies of the incident waves. This resonant mechanism is known to be generated by the transverse sloshing modes of the channel. Here the influence of the channel sloshing modes on the performance of the device is further investigated. Within the framework of a linear inviscid potential-flow theory, application of the Green theorem yields a hypersingular integral equation for the velocity potential in the fluid domain. The solution is found in terms of a fast-converging series of Chebyshev polynomials of the second kind. The physical behaviour of the system is then analysed, showing sensitivity of the resonant sloshing modes to the geometry of the device, that concurs in increasing the maximum efficiency. Analytical results are validated with available numerical and experimental d...

  20. Adaptive versus non-adaptive strategies for quantum channel discrimination

    E-Print Network [OSTI]

    Aram W. Harrow; Avinatan Hassidim; Debbie W. Leung; John Watrous

    2009-09-01

    We provide a simple example that illustrates the advantage of adaptive over non-adaptive strategies for quantum channel discrimination. In particular, we give a pair of entanglement-breaking channels that can be perfectly discriminated by means of an adaptive strategy that requires just two channel evaluations, but for which no non-adaptive strategy can give a perfect discrimination using any finite number of channel evaluations.

  1. Free Online Training on the DVU Learning Channel!

    Broader source: Energy.gov [DOE]

    Free online courses are now available through the DOE Virtual University (DVU) website on the new DVU Learning Channel

  2. Stochastic Wireless Channel Modeling, Estimation and Identification from Measurements

    SciTech Connect (OSTI)

    Olama, Mohammed M [ORNL; Djouadi, Seddik M [ORNL; Li, Yanyan [ORNL

    2008-07-01

    This paper is concerned with stochastic modeling of wireless fading channels, parameter estimation, and system identification from measurement data. Wireless channels are represented by stochastic state-space form, whose parameters and state variables are estimated using the expectation maximization algorithm and Kalman filtering, respectively. The latter are carried out solely from received signal measurements. These algorithms estimate the channel inphase and quadrature components and identify the channel parameters recursively. The proposed algorithm is tested using measurement data, and the results are presented.

  3. TRP channels as cellular sensors David E. Clapham

    E-Print Network [OSTI]

    Gunawardena, Jeremy

    of a battery. Small conformational changes cause channels to open, allowing over ten million ions to flow per

  4. Charged Higgs boson in the $W^\\pm$ Higgs channel at the Large Hadron Collider

    E-Print Network [OSTI]

    Rikard Enberg; William Klemm; Stefano Moretti; Shoaib Munir; Glenn Wouda

    2015-02-14

    In light of the recent discovery of a neutral Higgs boson, $H_{\\rm obs}$, with a mass near 125 GeV, we reassess the LHC discovery potential of a charged Higgs boson, $H^\\pm$, in the $W^\\pm H_{\\rm obs}$ decay channel. This decay channel can be particularly important for a $H^\\pm$ heavier than the top quark, when it is produced through the $pp \\rightarrow tH^\\pm$ process. The knowledge of the mass of $H_{\\rm obs}$ provides an additional handle in the kinematic selection when reconstructing a Breit-Wigner resonance in the $H_{\\rm obs} \\rightarrow b\\bar{b}$ decay channel. We consider some extensions of the Standard Model Higgs sector, with and without supersymmetry, and perform a dedicated signal-to-background analysis to test the scope of this channel for the LHC running at the design energy (14 TeV), for 300/fb (standard) and 3000/fb (high) integrated luminosities. We find that, while this channel does not show much promise for a supersymmetric $H^\\pm$ state, significant portions of the parameter spaces of several two-Higgs doublet models are testable.

  5. Structural Analyses of the Ankyrin Repeat Domain of TRPV6 and Related TRPV Ion Channels

    SciTech Connect (OSTI)

    Phelps, C.B.; Huang, R.J.; Lishko, P.V.; Wang, R.R.; Gaudet, R. (Harvard)

    2008-06-03

    Transient receptor potential (TRP) proteins are cation channels composed of a transmembrane domain flanked by large N- and C-terminal cytoplasmic domains. All members of the vanilloid family of TRP channels (TRPV) possess an N-terminal ankyrin repeat domain (ARD). The ARD of mammalian TRPV6, an important regulator of calcium uptake and homeostasis, is essential for channel assembly and regulation. The 1.7 A crystal structure of the TRPV6-ARD reveals conserved structural elements unique to the ARDs of TRPV proteins. First, a large twist between the fourth and fifth repeats is induced by residues conserved in all TRPV ARDs. Second, the third finger loop is the most variable region in sequence, length and conformation. In TRPV6, a number of putative regulatory phosphorylation sites map to the base of this third finger. Size exclusion chromatography and crystal packing indicate that the TRPV6-ARD does not assemble as a tetramer and is monomeric in solution. Adenosine triphosphate-agarose and calmodulin-agarose pull-down assays show that the TRPV6-ARD does not interact with either ligand, indicating a different functional role for the TRPV6-ARD than in the paralogous thermosensitive TRPV1 channel. Similar biochemical findings are also presented for the highly homologous mammalian TRPV5-ARD. The implications of the structural and biochemical data on the role of the ankyrin repeats in different TRPV channels are discussed.

  6. On The Outage Capacity Distribution of Correlated Keyhole MIMO Channels

    E-Print Network [OSTI]

    Loyka, Sergey

    On The Outage Capacity Distribution of Correlated Keyhole MIMO Channels G. Levin and S. Loyka for the instantaneous SNR and outage capacity distributions of a spatially correlated keyhole MIMO channel are given diversity channel with a single Tx (Rx) and multiple Rx (Tx) antennas. The outage capacity at low outage

  7. Multipath channels Path timing critical (versus amplitude information)

    E-Print Network [OSTI]

    Southern California, University of

    1 · Multipath channels · Path timing critical (versus amplitude information) ­ Certain modulations: PPM ­ Location/Ranging · Model ­ Delay spread ­ L paths (M choose L possible profiles) ­ Independent path amplitudes ­ Block constant channel ­ AW GN 0 100 200 300 400 500 600 -0.02 0 0.02 The Channel

  8. Concurrent signal combining and channel estimation in digital communications

    DOE Patents [OSTI]

    Ormesher, Richard C. (Albuquerque, NM); Mason, John J. (Albuquerque, NM)

    2011-08-30

    In the reception of digital information transmitted on a communication channel, a characteristic exhibited by the communication channel during transmission of the digital information is estimated based on a communication signal that represents the digital information and has been received via the communication channel. Concurrently with the estimating, the communication signal is used to decide what digital information was transmitted.

  9. COOPERATIVE SOURCE AND CHANNEL CODING FOR WIRELESS VIDEO TRANSMISSION

    E-Print Network [OSTI]

    Erkip, Elza

    COOPERATIVE SOURCE AND CHANNEL CODING FOR WIRELESS VIDEO TRANSMISSION Hoi Yin Shutoy, Yao Wang substantial improvement in channel reliability through cooperative transmission strategies. To exploit this benefit for video transmission, we propose to jointly allocate bits among video coding, channel coding

  10. Transmission Strategies for Correlated MIMO Links with Imperfect Channel Estimates

    E-Print Network [OSTI]

    Yener, Aylin

    Transmission Strategies for Correlated MIMO Links with Imperfect Channel Estimates Semih Serbetli for channel estimation versus data transmission. The optimum power allocation problem between the training sequences for channel estimation and data transmission for the correlated MIMO link is shown to have

  11. Adaptive versus non-adaptive strategies for quantum channel discrimination

    E-Print Network [OSTI]

    Watrous, John

    Adaptive versus non-adaptive strategies for quantum channel discrimination Aram W. Harrow Avinatan-adaptive strategies for quantum channel discrimination. In particular, we give a pair of entanglement- breaking channels that can be perfectly discriminated by means of an adaptive strategy that re- quires just two

  12. Microwave Radiometer – 3 Channel (MWR3C) Handbook

    SciTech Connect (OSTI)

    Cadeddu, MP

    2012-05-04

    The microwave radiometer 3-channel (MWR3C) provides time-series measurements of brightness temperatures from three channels centered at 23.834, 30, and 89 GHz. These three channels are sensitive to the presence of liquid water and precipitable water vapor.

  13. Adaptive Modulation and Scheduling of IP traffic over Fading Channels

    E-Print Network [OSTI]

    the traf- fic load. An obstacle in this context is the time-variability of the channel. To achieve a high to the traffic situation. 1 INTRODUCTION Fading channels confront us with the problem of lost packets. For a predicted value of the Signal to Noise and Interfer- ence Ratio (SNIR) of each channel, the modulation level

  14. Adaptive Modulation and Scheduling of IP traffic over Fading Channels

    E-Print Network [OSTI]

    the traf­ fic load. An obstacle in this context is the time­variability of the channel. To achieve a high to the traffic situation. 1 INTRODUCTION Fading channels confront us with the problem of lost packets. For a predicted value of the Signal to Noise and Interfer­ ence Ratio (SNIR) of each channel, the modulation level

  15. Renewable Energy Scheduling for Fading Channels with Maximum Power Constraint

    E-Print Network [OSTI]

    Greenberg, Albert

    Renewable Energy Scheduling for Fading Channels with Maximum Power Constraint Zhe Wang Electrical--In this paper, we develop efficient algorithm to obtain the optimal energy schedule for fading channel with energy harvesting. We assume that the side information of both the channel states and energy harvesting

  16. Turbulent heat transfer and friction in a segmental channel that simulates leading-edge cooling channels of modern turbine blades 

    E-Print Network [OSTI]

    Spence, Rodney Brian

    1995-01-01

    Experiments are conducted to study the effects of channel geometry and asymmetric heating on the heat transfer and friction characteristics of turbulent flows in leading edge cooling channels in stator blades of gas turbines. The leading edge...

  17. Demand based State Aware Channel Reconfiguration Algorithm for Multi-Channel Multi-Radio Wireless Mesh Networks 

    E-Print Network [OSTI]

    Balachandran, Athula; Franklin, A A; Siva Ram Murthy, C.; Marina, Mahesh

    Efficient utilization of Multi Channel - Multi Radio (MC-MR) Wireless Mesh Networks (WMNs) can be achieved only by intelligent Channel Assignment (CA) and Link Scheduling (LS). Due to the dynamic nature of traffic demand ...

  18. Generalized models and benchmarks for channel coordination 

    E-Print Network [OSTI]

    Toptal, Aysegul

    2004-09-30

    Models and Benchmarks for Channel Coordination. (August 2003) Ay¸ ¨ Toptal, B.S., Bilkent University, Turkey; M.S., Bilkent University, Turkey Chair of Advisory Committee: Dr. Sõla Cetinkaya This dissertation takes into account the latest industrial... of the Idea Behind Algorithm 3 . . . . . . . . . . . 58 12 Illustration of the Cost and Material Flows . . . . . . . . . . . . . 89 13 Illustration of Piv(Q) when (c -p)Pv > Rv . . . . . . . . . . . . . . 121 14 Different illustrations of Piv...

  19. Computational optimization of synthetic water channels.

    SciTech Connect (OSTI)

    Rogers, David Michael; Rempe, Susan L. B.

    2012-12-01

    Membranes for liquid and gas separations and ion transport are critical to water purification, osmotic energy generation, fuel cells, batteries, supercapacitors, and catalysis. Often these membranes lack pore uniformity and robustness under operating conditions, which can lead to a decrease in performance. The lack of uniformity means that many pores are non-functional. Traditional membranes overcome these limitations by using thick membrane materials that impede transport and selectivity, which results in decreased performance and increased operating costs. For example, limitations in membrane performance demand high applied pressures to deionize water using reverse osmosis. In contrast, cellular membranes combine high flux and selective transport using membrane-bound protein channels operating at small pressure differences. Pore size and chemistry in the cellular channels is defined uniformly and with sub-nanometer precision through protein folding. The thickness of these cellular membranes is limited to that of the cellular membrane bilayer, about 4 nm thick, which enhances transport. Pores in the cellular membranes are robust under operating conditions in the body. Recent efforts to mimic cellular water channels for efficient water deionization produced a significant advance in membrane function. The novel biomimetic design achieved a 10-fold increase in membrane permeability to water flow compared to commercial membranes and still maintained high salt rejection. Despite this success, there is a lack of understanding about why this membrane performs so well. To address this lack of knowledge, we used highperformance computing to interrogate the structural and chemical environments experienced by water and electrolytes in the newly created biomimetic membranes. We also compared the solvation environments between the biomimetic membrane and cellular water channels. These results will help inform future efforts to optimize and tune the performance of synthetic biomimetic membranes for applications in water purification, energy, and catalysis.

  20. Scripps Channel 1 | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onRAPID/Geothermal/Exploration/ColoradoRemsenburg-Speonk,SageScheuco InternationalScottScripps Channel 1 Jump to:

  1. Energy conversion device with support member having pore channels

    DOE Patents [OSTI]

    Routkevitch, Dmitri [Longmont, CO; Wind, Rikard A [Johnstown, CO

    2014-01-07

    Energy devices such as energy conversion devices and energy storage devices and methods for the manufacture of such devices. The devices include a support member having an array of pore channels having a small average pore channel diameter and having a pore channel length. Material layers that may include energy conversion materials and conductive materials are coaxially disposed within the pore channels to form material rods having a relatively small cross-section and a relatively long length. By varying the structure of the materials in the pore channels, various energy devices can be fabricated, such as photovoltaic (PV) devices, radiation detectors, capacitors, batteries and the like.

  2. CHANNEL MORPHOLOGY TOOL (CMT): A GIS-BASED AUTOMATED EXTRACTION MODEL FOR CHANNEL GEOMETRY

    SciTech Connect (OSTI)

    JUDI, DAVID; KALYANAPU, ALFRED; MCPHERSON, TIMOTHY; BERSCHEID, ALAN

    2007-01-17

    This paper describes an automated Channel Morphology Tool (CMT) developed in ArcGIS 9.1 environment. The CMT creates cross-sections along a stream centerline and uses a digital elevation model (DEM) to create station points with elevations along each of the cross-sections. The generated cross-sections may then be exported into a hydraulic model. Along with the rapid cross-section generation the CMT also eliminates any cross-section overlaps that might occur due to the sinuosity of the channels using the Cross-section Overlap Correction Algorithm (COCoA). The CMT was tested by extracting cross-sections from a 5-m DEM for a 50-km channel length in Houston, Texas. The extracted cross-sections were compared directly with surveyed cross-sections in terms of the cross-section area. Results indicated that the CMT-generated cross-sections satisfactorily matched the surveyed data.

  3. Fe XII STALKS AND THE ORIGIN OF THE AXIAL FIELD IN FILAMENT CHANNELS

    SciTech Connect (OSTI)

    Wang, Y.-M.; Sheeley, N. R. Jr.; Stenborg, G. E-mail: neil.sheeley@nrl.navy.mil

    2013-06-10

    Employing Fe XII images and line-of-sight magnetograms, we deduce the direction of the axial field in high-latitude filament channels from the orientation of the adjacent stalklike structures. Throughout the rising phase of the current solar cycle 24, filament channels poleward of latitude 30 Degree-Sign overwhelmingly obeyed the hemispheric chirality rule, being dextral (sinistral) in the northern (southern) hemisphere, corresponding to negative (positive) helicity. During the deep minimum of 2007-2009, the orientation of the Fe XII stalks was often difficult to determine, but no obvious violations of the rule were found. Although the hemispheric trend was still present during the maximum and early declining phase of cycle 23 (2000-2003), several high-latitude exceptions were identified at that time. From the observation that dextral (sinistral) filament channels form through the decay of active regions whose Fe XII features show a counterclockwise (clockwise) whorl, we conclude that the axial field direction is determined by the intrinsic helicity of the active regions. In contrast, generation of the axial field component by the photospheric differential rotation is difficult to reconcile with the observed chirality of polar crown and circular filament channels, and with the presence of filament channels along the equator. The main role of differential rotation in filament channel formation is to expedite the cancellation of flux and thus the removal of the transverse field component. We propose further that, rather than being ejected into the heliosphere, the axial field is eventually resubmerged by flux cancellation as the adjacent unipolar regions become increasingly mixed.

  4. Channeling and dechanneling at high energy

    SciTech Connect (OSTI)

    Carrigan, R.A. Jr.

    1987-09-30

    The possibility of using channeling as a tool for high energy particle physics has now been extensively investigated. Bent crystals have been used as an accelerator extraction element and for particle deflection. Applications as accelerating devices have been discussed but appear remote. The major advantage in using a bent crystal rather than a magnet is the large deflection that can be achieved in a short length. The major disadvantage is the low transmission. A good understanding of dechanneling is important for applications. 43 refs., 1 fig., 3 tabs.

  5. A 64 channel VME transient recorder module

    SciTech Connect (OSTI)

    Rodrigues, A.M.P.; Batista, A.J.N.; Sousa, J.; Varandas, C.A.F. [Centro de Fusao Nuclear, Lisboa (Portugal)] [Centro de Fusao Nuclear, Lisboa (Portugal); Basilio Simoes, J.; Correia, C.M.B.A. [Univ. de Coimbra (Portugal). Dept. de Fisica] [Univ. de Coimbra (Portugal). Dept. de Fisica

    1996-02-01

    This paper describes an inexpensive and innovative VME transient recorder module, with 64 multiplexed analog input channels, 12-bit resolution, sampling rate up to 666 kSPS and 2 MWords of local memory providing standalone operation capability. This module was developed for the operation control of the tokamak ISTTOK. Its architecture takes advantage of the large scale integration and improved dynamic performance of recently developed devices. The main operational features are described and methods for assessing the performance are discussed. The experimental results already obtained as well as the philosophy of operation and programmability of this module suggest its adequacy to the monitoring of a large and complex nuclear physics experiment.

  6. Carderock Circulating Water Channel | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX ECoopButte County,Camilla, Georgia: Energy ResourcesRanchCirculating Water Channel Jump

  7. Distributed Channel Probing for Efficient Transmission Scheduling Over Wireless Fading Channels

    E-Print Network [OSTI]

    Eryilmaz, Atilla

    a natural tradeoff between exploring the multi-user diversity and energy consumption for channel acquisition develop a similar MWS-type algorithm that minimizes the energy consumption. However, the resulting Li and Atilla Eryilmaz Abstract--It is energy-consuming and operationally cumber- some for all users

  8. Reinvestigating Channel Orthogonality -Adjacent Channel Interference in IEEE 802.11n Networks

    E-Print Network [OSTI]

    .11 with a focus on new 802.11n standard. ACI is causing problems that are related to the carrier sensing mechanism,sombrutz}@informatik.hu-berlin.de Abstract--In this paper we analyze the adverse effects of Adjacent Channel Interference (ACI) on 802 effect of ACI can be reduced in two ways. First, by increasing the spatial separation between the radios

  9. Magnets for Muon 6D Cooling Channels

    SciTech Connect (OSTI)

    Johnson, Rolland; Flanagan, Gene

    2014-09-10

    The Helical Cooling Channel (HCC), an innovative technique for six-dimensional (6D) cooling of muon beams using a continuous absorber inside superconducting magnets, has shown considerable promise based on analytic and simulation studies. The implementation of this revolutionary method of muon cooling requires high field superconducting magnets that provide superimposed solenoid, helical dipole, and helical quadrupole fields. Novel magnet design concepts are required to provide HCC magnet systems with the desired fields for 6D muon beam cooling. New designs feature simple coil configurations that produce these complex fields with the required characteristics, where new high field conductor materials are particularly advantageous. The object of the program was to develop designs and construction methods for HCC magnets and design a magnet system for a 6D muon beam cooling channel. If successful the program would develop the magnet technologies needed to create bright muon beams for many applications ranging from scientific accelerators and storage rings to beams to study material properties and new sources of energy. Examples of these applications include energy frontier muon colliders, Higgs and neutrino factories, stopping muon beams for studies of rare fundamental interactions and muon catalyzed fusion, and muon sources for cargo screening for homeland security.

  10. A seismic approach to testing different formation channels of subdwarf B stars

    E-Print Network [OSTI]

    Haili Hu; M. -A. Dupret; C. Aerts; G. Nelemans; S. D. Kawaler; A. Miglio; J. Montalban; R. Scuflaire

    2008-08-22

    There are many unknowns in the formation of subdwarf B stars. Different formation channels are considered to be possible and to lead to a variety of helium-burning subdwarfs. All seismic models to date, however, assume that a subdwarf B star is a post-helium-flash-core surrounded by a thin inert layer of hydrogen. We examine an alternative formation channel, in which the subdwarf B star originates from a massive (>~2 Msun) red giant with a non-degenerate helium-core. Although these subdwarfs may evolve through the same region of the log g-Teff diagram as the canonical post-flash subdwarfs, their interior structure is rather different. We examine how this difference affects their pulsation modes and whether it can be observed. Using detailed stellar evolution calculations we construct subdwarf B models from both formation channels. The iron accumulation in the driving region due to diffusion, which causes the excitation of the modes, is approximated by a Gaussian function. The pulsation modes and frequencies are calculated with a non-adiabatic pulsation code. A detailed comparison of two subdwarf B models from different channels, but with the same log g and Teff, shows that their mode excitation is different. The excited frequencies are lower for the post-flash than for the post-non-degenerate subdwarf B star. This is mainly due to the differing chemical composition of the stellar envelope. A more general comparison between two grids of models shows that the excited frequencies of most post-non-degenerate subdwarfs cannot be well-matched with the frequencies of post-flash subdwarfs. In the rare event that an acceptable seismic match is found, additional information, such as mode identification and log g and Teff determinations, allows us to distinguish between the two formation channels.

  11. The potassium ion channel opener NS1619 inhibits proliferation and induces apoptosis in A2780 ovarian cancer cells

    SciTech Connect (OSTI)

    Han Xiaobing; Xi Ling; Wang Hui; Huang Xiaoyuan; Ma Xiangyi; Han Zhiqiang; Wu Peng; Ma Xiaoli; Lu Yunping; Wang, Gang Zhou Jianfeng; Ma Ding

    2008-10-17

    Diverse types of voltage-gated potassium (K{sup +}) channels have been shown to be involved in regulation of cell proliferation. The maxi-conductance Ca{sup 2+}-activated K{sup +} channels (BK channels) may play an important role in the progression of human cancer. To explore the role of BK channels in regulation of apoptosis in human ovarian cancer cells, the effects of the specific BK channel activator NS1619 on induction of apoptosis in A2780 cells were observed. Following treatment with NS1619, cell proliferation was measured by MTT assay. Apoptosis of A2780 cells pretreated with NS1619 was detected by agarose gel electrophoresis of cellular DNA and flow cytometry. Our data demonstrate that NS1619 inhibits the proliferation of A2780 cells in a dosage and time dependent manner IC{sub 50} = 31.1 {mu}M, for 48 h pretreatment and induces apoptosis. Western blot analyses showed that the anti-proliferation effect of NS1619 was associated with increased expression of p53, p21, and Bax. These results indicate that BK channels play an important role in regulating proliferation of human ovarian cancer cells and may induce apoptosis through induction of p21{sup Cip1} expression in a p53-dependent manner.

  12. Juvenile Chinook salmon (Oncorhynchus tshawytscha) growth in off-channel and main-channel habitats on the Sacramento River, CA using otolith increment widths

    E-Print Network [OSTI]

    Limm, Michael P.; Marchetti, Michael P.

    2009-01-01

    in both off- channel ponds and non- natal seasonalet al. 2001), off-channel ponds (e.g. Peterson 1982), natalriverine areas, off-channel ponds, and non-natal seasonal

  13. Communication channel of fermionic system in accelerated frame

    E-Print Network [OSTI]

    Jinho Chang; Younghun Kwon

    2012-08-23

    In this article, we investigate the communication channel of fermionic system in an accelerated frame. We observe that at the infinite acceleration, the mutual information of single rail quantum channel coincides with that of double rail quantum channel, but those of classical ones reach different values. Furthermore, we find that at the infinite acceleration, the conditional entropy of single(or double) rail quantum channel vanishes, but those of classical ones may have finite values. In addition, we see that even when considering a method beyond the single mode approximation, the dual rail entangled state seems to provide better channel capacity than the single rail entangled state, unlike the bosonic case. Moreover, we find that the single-mode approximation is not sufficient to analyze the communication channel of fermionic system in an accelerated frame.

  14. Massively parallel processor networks with optical express channels

    DOE Patents [OSTI]

    Deri, R.J.; Brooks, E.D. III; Haigh, R.E.; DeGroot, A.J.

    1999-08-24

    An optical method for separating and routing local and express channel data comprises interconnecting the nodes in a network with fiber optic cables. A single fiber optic cable carries both express channel traffic and local channel traffic, e.g., in a massively parallel processor (MPP) network. Express channel traffic is placed on, or filtered from, the fiber optic cable at a light frequency or a color different from that of the local channel traffic. The express channel traffic is thus placed on a light carrier that skips over the local intermediate nodes one-by-one by reflecting off of selective mirrors placed at each local node. The local-channel-traffic light carriers pass through the selective mirrors and are not reflected. A single fiber optic cable can thus be threaded throughout a three-dimensional matrix of nodes with the x,y,z directions of propagation encoded by the color of the respective light carriers for both local and express channel traffic. Thus frequency division multiple access is used to hierarchically separate the local and express channels to eliminate the bucket brigade latencies that would otherwise result if the express traffic had to hop between every local node to reach its ultimate destination. 3 figs.

  15. Coupled-channel scattering in 1 + 1 dimensional lattice model

    SciTech Connect (OSTI)

    Guo, Peng [JLAB

    2013-07-01

    Based on the Lippmann-Schwinger equation approach, a generalized Lüscher’s formula in 1+1 dimensions for two particles scattering in both the elastic and coupled-channel cases in moving frames is derived. A two-dimensional coupled-channel scattering lattice model is presented, which represents a two-coupled-channel resonant scattering scalars system. The Monte Carlo simulation is performed on finite lattices and in various moving frames. The two-dimensional generalized Lüscher’s formula is used to extract the scattering amplitudes for the coupled-channel system from the discrete finite-volume spectrum.

  16. Plasma Channel Diagnostic Based on Laser Centroid Oscillations

    SciTech Connect (OSTI)

    Gonsalves, A.J.; Nakamura, K.; Lin, C.; Osterhoff, J.; Shiraishi, S.; Schroeder, C.B.; Geddes, C.G.R.; Toth, Cs.; Esarey, E.; Leemans, W.P.

    2010-02-12

    A technique has been developed for measuring the properties of discharge-based plasma channels by monitoring the centroid location of a laser beam exiting the channel as a function of input alignment offset between the laser and the channel. Experiments were performed using low-intensity (< 1014 Wcm-2) laser pulses focused onto the entrance of a hydrogen-filled capillary discharge waveguide. Scanning the laser centroid position at the input of the channel and recording the exit position allows determination of the channel depth with an accuracy of a few percent, measurement of the transverse channel shape, and inference of the matched spot size. In addition, accurate alignment of the laser beam through the plasma channel is provided by minimizing laser centroid motion at the channel exit as the channel depth is scanned either by scanning the plasma density or the discharge timing. The improvement in alignment accuracy provided by this technique will be crucial for minimizing electron beam pointing errors in laser plasma accelerators.

  17. A Channel Estimation Technique in OFDM Systems Using No Pilots

    E-Print Network [OSTI]

    Louisville, University of

    Abdelrehim ECE Department University of Louisville Louisville, KY, United States Said Elnoubi Electrical Engineering Department Alexandria University Alexandria, Egypt Abstract--This paper proposes a channel

  18. Massively parallel processor networks with optical express channels

    DOE Patents [OSTI]

    Deri, Robert J. (Pleasanton, CA); Brooks, III, Eugene D. (Livermore, CA); Haigh, Ronald E. (Tracy, CA); DeGroot, Anthony J. (Castro Valley, CA)

    1999-01-01

    An optical method for separating and routing local and express channel data comprises interconnecting the nodes in a network with fiber optic cables. A single fiber optic cable carries both express channel traffic and local channel traffic, e.g., in a massively parallel processor (MPP) network. Express channel traffic is placed on, or filtered from, the fiber optic cable at a light frequency or a color different from that of the local channel traffic. The express channel traffic is thus placed on a light carrier that skips over the local intermediate nodes one-by-one by reflecting off of selective mirrors placed at each local node. The local-channel-traffic light carriers pass through the selective mirrors and are not reflected. A single fiber optic cable can thus be threaded throughout a three-dimensional matrix of nodes with the x,y,z directions of propagation encoded by the color of the respective light carriers for both local and express channel traffic. Thus frequency division multiple access is used to hierarchically separate the local and express channels to eliminate the bucket brigade latencies that would otherwise result if the express traffic had to hop between every local node to reach its ultimate destination.

  19. Code design for erasure channels with limited or noisy feedback 

    E-Print Network [OSTI]

    Nagasubramanian, Karthik

    2009-05-15

    The availability of feedback in communication channels can significantly increase the reliability of transmission while decreasing the encoding and decoding complexity. Most of the applications like cellular telephony, ...

  20. Joint source channel coding for non-ergodic channels: the distortion signal-to-noise ratio (SNR) exponent perspective 

    E-Print Network [OSTI]

    Bhattad, Kapil

    2008-10-10

    the probability of outage is low. 28 However, the corresponding quantization error is large. When the multiplexing rate is increased quantization error decreases but outage probability increases. For these schemes, the optimal multiplexing rate is chosen... and channel coding is optimal. In this work we study this problem for non-ergodic channels. Although not much can be said about the general problem of transmitting any analog sources over any non-ergodic channels with any distortion metric, for many practical...

  1. Multi-channel medical imaging system

    DOE Patents [OSTI]

    Frangioni, John V

    2013-12-31

    A medical imaging system provides simultaneous rendering of visible light and fluorescent images. The system may employ dyes in a small-molecule form that remain in the subject's blood stream for several minutes, allowing real-time imaging of the subject's circulatory system superimposed upon a conventional, visible light image of the subject. The system may provide an excitation light source to excite the fluorescent substance and a visible light source for general illumination within the same optical guide used to capture images. The system may be configured for use in open surgical procedures by providing an operating area that is closed to ambient light. The systems described herein provide two or more diagnostic imaging channels for capture of multiple, concurrent diagnostic images and may be used where a visible light image may be usefully supplemented by two or more images that are independently marked for functional interest.

  2. Multiple channel optical data acquisition system

    DOE Patents [OSTI]

    Fasching, G.E.; Goff, D.R.

    1985-02-22

    A multiple channel optical data acquisition system is provided in which a plurality of remote sensors monitoring specific process variable are interrogated by means of a single optical fiber connecting the remote station/sensors to a base station. The remote station/sensors derive all power from light transmitted through the fiber from the base station. Each station/sensor is individually accessed by means of a light modulated address code sent over the fiber. The remote station/sensors use a single light emitting diode to both send and receive light signals to communicate with the base station and provide power for the remote station. The system described can power at least 100 remote station/sensors over an optical fiber one mile in length.

  3. Power module assemblies with staggered coolant channels

    SciTech Connect (OSTI)

    Herron, Nicholas Hayden; Mann, Brooks S; Korich, Mark D

    2013-07-16

    A manifold is provided for supporting a power module assembly with a plurality of power modules. The manifold includes a first manifold section. The first face of the first manifold section is configured to receive the first power module, and the second face of the first manifold section defines a first cavity with a first baseplate thermally coupled to the first power module. The first face of the second manifold section is configured to receive the second power module, and the second face of the second manifold section defines a second cavity with a second baseplate thermally coupled to the second power module. The second face of the first manifold section and the second face of the second manifold section are coupled together such that the first cavity and the second cavity form a coolant channel. The first cavity is at least partially staggered with respect to second cavity.

  4. Mathematical Modeling on Open Limestone Channel

    E-Print Network [OSTI]

    Bandstra, Joel; Wu, Naiyi

    2014-01-01

    Acid mine drainage (AMD) is the outflow of acidic water from metal mines or coal mines. When exposed to air and water, metal sulfides from the deposits of the mines are oxidized and produce acid, metal ions and sulfate, which lower the pH value of the water. An open limestone channel (OLC) is a passive and low cost way to neutralize AMD. The dissolution of calcium into the water increases the pH value of the solution. A differential equation model is numerically solved to predict the variation of concentration of each species in the OLC solution. The diffusion of Calcium due to iron precipitates is modeled by a linear equation. The results give the variation of pH value and the concentration of Calcium.

  5. Entropy of quantum channel in the theory of quantum information

    E-Print Network [OSTI]

    Wojciech Roga

    2011-10-03

    Quantum channels, also called quantum operations, are linear, trace preserving and completely positive transformations in the space of quantum states. Such operations describe discrete time evolution of an open quantum system interacting with an environment. The thesis contains an analysis of properties of quantum channels and different entropies used to quantify the decoherence introduced into the system by a given operation. Part I of the thesis provides a general introduction to the subject. In Part II, the action of a quantum channel is treated as a process of preparation of a quantum ensemble. The Holevo information associated with this ensemble is shown to be bounded by the entropy exchanged during the preparation process between the initial state and the environment. A relation between the Holevo information and the entropy of an auxiliary matrix consisting of square root fidelities between the elements of the ensemble is proved in some special cases. Weaker bounds on the Holevo information are also established. The entropy of a channel, also called the map entropy, is defined as the entropy of the state corresponding to the channel by the Jamiolkowski isomorphism. In Part III of the thesis, the additivity of the entropy of a channel is proved. The minimal output entropy, which is difficult to compute, is estimated by an entropy of a channel which is much easier to obtain. A class of quantum channels is specified, for which additivity of channel capacity is conjectured. The last part of the thesis contains characterization of Davies channels, which correspond to an interaction of a state with a thermal reservoir in the week coupling limit, under the condition of quantum detailed balance and independence of rotational and dissipative evolutions. The Davies channels are characterized for one-qubit and one-qutrit systems.

  6. Quantum Mechanical Calculations of Charge Effects on gating the KcsA channel

    SciTech Connect (OSTI)

    Kariev, Alisher M.; Znamenskiy, Vasiliy S.; Green, Michael E.

    2007-02-06

    The research described in this product was performed in part in the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the Department of Energy's Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory. A series of ab initio (density functional) calculations were carried out on side chains of a set of amino acids, plus water, from the (intracellular) gating region of the KcsA K+ channel. Their atomic coordinates, except hydrogen, are known from X-ray structures [D.A. Doyle, J.M. Cabral, R.A. Pfuetzner, A. Kuo, J.M. Gulbis, S.L. Cohen, B.T. Chait, R. MacKinnon, The structure of the potassium channel: molecular basis of K+ conduction and selectivity, Science 280 (1998) 69–77; R. MacKinnon, S.L. Cohen, A. Kuo, A. Lee, B.T. Chait, Structural conservation in prokaryotic and eukaryotic potassium channels, Science 280 (1998) 106–109; Y. Jiang, A. Lee, J. Chen, M. Cadene, B.T. Chait, R. MacKinnon, The open pore conformation of potassium channels. Nature 417 (2001) 523–526], as are the coordinates of some water oxygen atoms. The 1k4c structure is used for the starting coordinates. Quantum mechanical optimization, in spite of the starting configuration, places the atoms in positions much closer to the 1j95, more tightly closed, configuration. This state shows four water molecules forming a “basket” under the Q119 side chains, blocking the channel. When a hydrated K+ approaches this “basket”, the optimized system shows a strong set of hydrogen bonds with the K+ at defined positions, preventing further approach of the K+ to the basket. This optimized structure with hydrated K+ added shows an ice-like 12 molecule nanocrystal of water. If the water molecules exchange, unless they do it as a group, the channel will remain blocked. The “basket” itself appears to be very stable, although it is possible that the K+ with its hydrating water molecules may be more mobile, capable of withdrawing from the gate. It is also not surprising that water essentially freezes, or forms a kind of glue, in a nanometer space; this agrees with experimental results on a rather different, but similarly sized (nm dimensions) system [K.B. Jinesh, J.W.M. Frenken, Capillary condensation in atomic scale friction: how water acts like a glue, Phys. Rev. Lett. 96 (2006) 166103/1–4].

  7. 6340 IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 58, NO. 12, DECEMBER 2010 Binary Consensus Over Fading Channels

    E-Print Network [OSTI]

    Mostofi, Yasamin

    in fading en- vironments. We show the impact of channel unreliability and net- work topology on consensus such as environmental mon- itoring, surveillance and security, smart homes and factories, target tracking and military are with the Electrical and Computer Engineering Depart- ment, University of New Mexico, Albuquerque, NM 87131 USA (e

  8. IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 55, NO. 12, DECEMBER 2009 5353 Wiretap Channel With Secure Rate-Limited Feedback

    E-Print Network [OSTI]

    Franceschetti, Massimo

    as a secret key on top of Wyner's coding scheme for wiretap channels without feedback. Hence, when a feedback secret from Eve. If Eve has complete access to what Bob receives, Shannon showed that in order to achieve perfect secrecy, a secret key of entropy has to be shared between Alice and Bob. This fundamental yet

  9. Abrupt termination of a quantum channel and exactly solvable position-dependent mass models in three dimensions

    E-Print Network [OSTI]

    C. Quesne

    2007-03-04

    We consider a particle with a position-dependent mass, moving in a three-dimensional semi-infinite parallelepipedal or cylindrical channel under the influence of some hyperbolic potential. We show that the lack of uniformity in the environment generates an infinite number of bound states.

  10. Numerical investigation of interfacial transport resistance due to water droplets in proton exchange membrane fuel cell air channels

    E-Print Network [OSTI]

    Kandlikar, Satish

    (GDL) interface is needed in modelling the performance of a proton exchange membrane fuel cell (PEMFC representative case of a PEMFC air flow channel. The results show that the droplets significantly increase Sh of a proton exchange membrane fuel cell (PEMFC) is an active area of research. The O2 transport loss becomes

  11. Effective charge and free energy of DNA inside an ion channel

    E-Print Network [OSTI]

    Jingshan Zhang; B. I. Shklovskii

    2008-03-03

    Translocation of a single stranded DNA (ssDNA) through an alpha-hemolysin channel in a lipid membrane driven by applied transmembrane voltage V was extensively studied recently. While the bare charge of the ssDNA piece inside the channel is approximately 12 (in units of electron charge) measurements of different effective charges resulted in values between one and two. We explain these challenging observations by a large self-energy of a charge in the narrow water filled gap between ssDNA and channel walls, related to large difference between dielectric constants of water and lipid, and calculate effective charges of ssDNA. We start from the most fundamental stall charge $q_s$, which determines the force $F_s= q_s V/L$ stalling DNA against the voltage V (L is the length of the channel). We show that the stall charge $q_s$ is proportional to the ion current blocked by DNA, which is small due to the self-energy barrier. Large voltage V reduces the capture barrier which DNA molecule should overcome in order to enter the channel by $|q_c|V$, where $q_c$ is the effective capture charge. We expressed it through the stall charge $q_s$. We also relate the stall charge $q_s$ to two other effective charges measured for ssDNA with a hairpin in the back end: the charge $q_u$ responsible for reduction of the barrier for unzipping of the hairpin and the charge $q_e$ responsible for DNA escape in the direction of hairpin against the voltage. At small V we explain reduction of the capture barrier with the salt concentration.

  12. Iterative Water-filling for Gaussian Vector Multiple Access Channels

    E-Print Network [OSTI]

    Li, Tiffany Jing

    Iterative Water-filling for Gaussian Vector Multiple Access Channels W. Yu, W. Rhee, S. Boyd, and J. Cioffi Zhenlei Shen Lehigh University March 29, 2005 Zhenlei Shen (Lehigh) Iterative Water-filling for Gaussian Vector Multiple Access ChannelsMarch 29, 2005 1 / 13 #12;1 Quick Review 2 Iterative Water

  13. The Energy Harvesting Multiple Access Channel with Energy Storage Losses

    E-Print Network [OSTI]

    Yener, Aylin

    The Energy Harvesting Multiple Access Channel with Energy Storage Losses Kaya Tutuncuoglu and Aylin considers a Gaussian multiple access channel with two energy harvesting transmitters with lossy energy storage. The power allocation policy maximizing the average weighted sum rate given the energy harvesting

  14. Electromagnetic Side Channels of an FPGA Implementation of AES

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Electromagnetic Side Channels of an FPGA Implementation of AES Vincent Carlier, Hervâ??e Chabanne processed. Another side channel is the one that exploits the Electromagnetic (EM) emanations. Indeed references. In [QS01, GMO01], Simple Electromagnetic Analysis (SEMA) and Di#erential Electromagnetic Analysis

  15. Electromagnetic Side Channels of an FPGA Implementation of AES

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Electromagnetic Side Channels of an FPGA Implementation of AES Vincent Carlier, Herv´e Chabanne processed. Another side channel is the one that exploits the Electromagnetic (EM) emanations. Indeed references. In [QS01, GMO01], Simple Electromagnetic Analysis (SEMA) and Differential Electromagnetic

  16. Water Transport in Hydrophilic Channels of Nafion (DMR 0819860)

    E-Print Network [OSTI]

    Petta, Jason

    (RH) that open up the ion channels for optimal proton transport. Nafion, a polymer used for fuel cells Benziger, Princeton University Sr Fuel cells convert chemical energy to electrical energy by transporting protons through ion conducting channels in polymer membranes. Improving proton conduction will make fuel

  17. SERVICE OUTAGE BASED ADAPTIVE TRANSMISSION IN FADING CHANNELS

    E-Print Network [OSTI]

    Yates, Roy

    SERVICE OUTAGE BASED ADAPTIVE TRANSMISSION IN FADING CHANNELS BY JIANGHONG LUO A dissertation OF THE DISSERTATION Service Outage Based Adaptive Transmission in Fading Channels by Jianghong Luo Dissertation Director: Prof. Roy Yates, Prof. Predrag Spasojevi´c The service outage based allocation problem explores

  18. On Asymptotic Outage Capacity Distribution of Correlated MIMO Channels

    E-Print Network [OSTI]

    Loyka, Sergey

    On Asymptotic Outage Capacity Distribution of Correlated MIMO Channels Georgy Levin* and Sergey condition for the asymptotic normality of MIMO channel outage capacity is considered. Some physical aspects, asymptotic capacity, correlation. I. INTRODUCTION Outage capacity is one of the major characteristics

  19. Wood in rivers: interactions with channel morphology and processes

    E-Print Network [OSTI]

    Montgomery, David R.

    Editorial Wood in rivers: interactions with channel morphology and processes No doubt about it, wood complicates fluvial geo- morphology. It messes up nice tidy streams, compli- cates quantitative through the study of channels lacking a substantial load of wood debris (Leopold et al., 1964

  20. Ion-Channeling in Direct Dark Matter Crystalline Detectors

    E-Print Network [OSTI]

    Graciela B. Gelmini

    2010-12-17

    The channeling of the recoiling nucleus in crystalline detectors after a WIMP collision would produce a larger scintillation or ionization signal in direct detection experiments than otherwise expected. I present estimates of the importance of this effect in NaI, Si and Ge crystals, using analytic models developed from the 1960's onwards to describe channeling and blocking effects.

  1. Radiation Emission by Electrons Channeling in Bent Silicon Crystals

    E-Print Network [OSTI]

    Polozkov, R G; Sushko, G B; Korol, Andrey V; Solov'yov, Andrey V

    2014-01-01

    Results of numerical simulations of electron channeling and emission spectra are reported for straight and uniformly bent silicon crystal. The projectile trajectories are computed using the newly developed module [1] of the MBN Explorer package [2,3]. The electron channeling along Si(110) crystallographic planes is studied for the projectile energy 855 MeV.

  2. Wind Noise Reduction in Single Channel Speech Signals

    E-Print Network [OSTI]

    Wind Noise Reduction in Single Channel Speech Signals Kristian Timm Andersen Kongens Lyngby 2008;Abstract In this thesis a number of wind noise reduction techniques have been reviewed, implemented and evaluated. The focus is on reducing wind noise from speech in single channel signals. More specically

  3. All entangled states are useful for channel discrimination

    E-Print Network [OSTI]

    M. Piani; J. Watrous

    2009-07-16

    We prove that every entangled state is useful as a resource for the problem of minimum-error channel discrimination. More specifically, given a single copy of an arbitrary bipartite entangled state, it holds that there is an instance of a quantum channel discrimination task for which this state allows for a correct discrimination with strictly higher probability than every separable state.

  4. Clustering of cyclic-nucleotide-gated channels in olfactory cilia

    E-Print Network [OSTI]

    French, Donald A.

    Cincinnati, OH 45267-0667, USA 513-558-6099 513-558-2727 FAX steve@syrano.acb.uc.edu Running title: CNG of olfactory signal transduction, including a high density of cyclic-nucleotide-gated (CNG) channels. CNG the locations of CNG channels along the length may be important in determining the sensitivity of odor detection

  5. Streams and Drainage Systems Stream Channel: natural passageway

    E-Print Network [OSTI]

    Gung, Yuancheng

    ;Base Level The stream's potential energy decreases as it flows downslope, and falls to zeroStreams and Drainage Systems #12; - / - - #12; - - - - #12; (Stream) #12;Stream Channel: natural passageway A stream's discharge may vary along the channel and through the time because

  6. Sparse Channel Estimation for Multicarrier Underwater Acoustic Communication: From

    E-Print Network [OSTI]

    Zhou, Shengli

    channel energy is concentrated on a few delay and/or Doppler values [5], [6]. Sparse channel estimation], or Monte Carlo Markov Chain methods [10]. More recently, advances in the new field of compressive sensing data was recorded as part of the SPACE'08 experiment off the coast of Martha's Vineyard, MA, from Oct

  7. Distributed Channel Probing for Efficient Transmission Scheduling in Wireless Networks

    E-Print Network [OSTI]

    Srikant, Rayadurgam

    to continuously estimate the channel quality before each transmission decision in opportunistic scheduling over statistics and rates, and note its tightness in the symmetric and independent ON- OFF fading scenario. We transmission decision. However, in the presence of many contending users that utilize the time-varying channel

  8. Secular Sediment Waves, Channel Bed Waves, and Legacy Sediment

    E-Print Network [OSTI]

    James, L. Allan

    Secular Sediment Waves, Channel Bed Waves, and Legacy Sediment L. Allan James* Geography Department, University South Carolina Abstract The concept of sediment waves is reviewed and clarifications are proposed for nomenclature con- cerning vertical channel responses to large fluvial sediment fluxes over a period of a decade

  9. Adaptive Modulation for Fading Channels Nilo Casimiro Ericsson

    E-Print Network [OSTI]

    communication systems, transmission in the downlink will often dominate the traf­ fic load. High bit. INTRODUCTION Fading channels confront us with the problem of lost packets and the need for frequent the signalling overhead. For a predicted value of the signal to noise ratio (SNR) of the channel, the modulation

  10. Adaptive Modulation for Fading Channels Nilo Casimiro Ericsson

    E-Print Network [OSTI]

    communication systems, transmission in the downlink will often dominate the traf- fic load. High bit. INTRODUCTION Fading channels confront us with the problem of lost packets and the need for frequent the signalling overhead. For a predicted value of the signal to noise ratio (SNR) of the channel, the modulation

  11. Optimal Training Signals for MIMO OFDM Channel Estimation

    E-Print Network [OSTI]

    Minn, Hlaing

    Optimal Training Signals for MIMO OFDM Channel Estimation Hlaing Minn*, Member, IEEE and Naofal Al.minn@utdallas.edu, aldhahir@utdallas.edu Abstract--This paper presents general classes of optimal train- ing signals transform are used to derive the optimal training signals which minimize the channel estimation mean square

  12. channels enable burst output in rat cerebellar Purkinje cells

    E-Print Network [OSTI]

    Turner, Ray

    to generate an appropriate spike output depends on a balance between membrane depolarizationsKv3 K+ channels enable burst output in rat cerebellar Purkinje cells B. E. McKay and R. W. Turner and the repolarizing actions of K+ currents. The high-voltage-activated Kv3 class of K+ channels repolarizes Na+ spikes

  13. In-vehicle mm-Wave Channel Model and Measurement

    E-Print Network [OSTI]

    Zemen, Thomas

    . I. INTRODUCTION The ever increasing vehicle efficiency goes hand in hand with weight savings. OneIn-vehicle mm-Wave Channel Model and Measurement Jiri Blumenstein, Tomas Mikulasek, Roman Marsalek measurements carried out in the intra­ vehicle environment. Channels in the millimeter-wave (MMW) frequency

  14. Channel bed evolution and sediment transport under declining sand inputs

    E-Print Network [OSTI]

    Montgomery, David R.

    Channel bed evolution and sediment transport under declining sand inputs Karen B. Gran,1,2 David R structure development and sediment transport as sand inputs decline. On the Pasig-Potrero River, we investigated channel recovery following emplacement of sand-rich pyroclastic deposits in the 1991 eruption

  15. Performance Analysis of Multi-Channel Wireless Infrastructure Networks

    E-Print Network [OSTI]

    Ramasubramanian, Srinivasan

    between channels with some tuning delay. A node is a stationary wireless router which is mounted usuallyPerformance Analysis of Multi-Channel Wireless Infrastructure Networks Sangman Cho, Srinivasan, Washington, DC 20052 Abstract--Wireless infrastructure networks that provide ubiq- uitous connectivity

  16. Analysis of Seepage from Polygon Channels Bhagu R. Chahar1

    E-Print Network [OSTI]

    Chahar, B. R.

    Analysis of Seepage from Polygon Channels Bhagu R. Chahar1 Abstract: An exact analytical solution conformal mapping and Green- Neumann functions. Chahar 2001 analyzed seepage from slit and strip channels by a drainage layer. Chahar 2000 and Swamee et al. 2001 obtained an analytical solution for seepage from

  17. Analyzing video compression for transporting over wireless fading channels 

    E-Print Network [OSTI]

    Kannan, Karthik

    2006-10-30

    to analyze the effect of a wireless channel on a video transmission. The aim of this research is to analyze the video transmission over Rayleigh fading channels for various bit error rates (BER), signal to noise ratios (Eb/N0) and Doppler rates...

  18. Columbia River Channel Improvement Project Rock Removal Blasting: Monitoring Plan

    SciTech Connect (OSTI)

    Carlson, Thomas J.; Johnson, Gary E.

    2010-01-29

    This document provides a monitoring plan to evaluate take as outlined in the National Marine Fisheries Service 2002 Biological Opinion for underwater blasting to remove rock from the navigation channel for the Columbia River Channel Improvement Project. The plan was prepared by the Pacific Northwest National Laboratory (PNNL) for the U.S. Army Corps of Engineers (USACE), Portland District.

  19. On Sufficient Conditions for Testing Optimality of Codewords in ISI Channels

    E-Print Network [OSTI]

    Kavcic, Aleksandar

    On Sufficient Conditions for Testing Optimality of Codewords in ISI Channels Fabian Lim1 if a codeword is optimal, for intersymbol interference (ISI) channels. I. INTRODUCTION The maximum interference (ISI) channels, where (channel) memory is present. The techniques for the memoryless channels

  20. Queuing Network Models for Multi-Channel P2P Live Streaming Systems

    E-Print Network [OSTI]

    Liu, Yong

    , including peer channel switching, peer churn, peer bandwidth heterogeneity, and Zipf-like channel popularity if not millions of live channels. In P2P live video streaming systems, churn occurs on two different time scales-channel or more simply as ISO P2P streaming systems. Unfortunately, this channel churn brings enormous instability

  1. Designer proton-channel transgenic algae for photobiological hydrogen production

    DOE Patents [OSTI]

    Lee, James Weifu (Knoxville, TN)

    2011-04-26

    A designer proton-channel transgenic alga for photobiological hydrogen production that is specifically designed for production of molecular hydrogen (H.sub.2) through photosynthetic water splitting. The designer transgenic alga includes proton-conductive channels that are expressed to produce such uncoupler proteins in an amount sufficient to increase the algal H.sub.2 productivity. In one embodiment the designer proton-channel transgene is a nucleic acid construct (300) including a PCR forward primer (302), an externally inducible promoter (304), a transit targeting sequence (306), a designer proton-channel encoding sequence (308), a transcription and translation terminator (310), and a PCR reverse primer (312). In various embodiments, the designer proton-channel transgenic algae are used with a gas-separation system (500) and a gas-products-separation and utilization system (600) for photobiological H.sub.2 production.

  2. Component having cooling channel with hourglass cross section

    DOE Patents [OSTI]

    Campbell, Christian X; Lee, Ching-Pang

    2015-04-28

    A cooling channel (36, 36B, 63-66) cools inner surfaces (48, 50) of exterior walls (41, 43) of a component (20, 60). Interior side surfaces (52, 54) of the channel converge to a waist (W2), forming an hourglass shaped transverse profile (46). The inner surfaces (48, 50) may have fins (44) aligned with the coolant flow (22). The fins may have a transverse profile (56A, 56B) highest at mid-width of the inner surfaces (48, 50). Turbulators (92) may be provided on the side surfaces (52, 54) of the channel, and may urge the coolant flow toward the inner surfaces (48, 50). Each turbulator (92) may have a peak (97) that defines the waist of the cooling channel. Each turbulator may have a convex upstream side (93). These elements increase coolant flow in the corners (C) of the channel to more uniformly and efficiently cool the exterior walls (41, 43).

  3. Characterization of coherent power of concatenation of quantum channels

    E-Print Network [OSTI]

    Kaifeng Bu; Lin Zhang; Junde Wu

    2015-10-27

    Quantum coherence, existing in quantum states, is a very important resource for design and implementation of quantum technologies. Quantum channels that can generate coherence is also an interesting topic and less known results about it. In this paper, we focus mainly on the coherent power of quantum channels and give a operational meaning to the coherent power. Then we characterize the coherent power of concatenation of quantum channels via that of individual channels. In addition, we also propose a new proper coherence measures which is subadditive. Thus coherence measure can be superadditive, additive, or subadditive, up to the specific problems investigated. At the end of this paper, we compare two different definitions of the coherent powers of quantum channels and find that they are not equivalent in general.

  4. IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 60, NO. 8, AUGUST 2012 4403 Joint Source-Channel Coding and Channelization

    E-Print Network [OSTI]

    Zhang, Tong

    -Channel Coding and Channelization for Embedded Video Processing With Flash Memory Storage Yiran Li, Guiqiang Dong and hence higher data storage/retrieval energy consumption. This clearly demands a system optimizationIEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 60, NO. 8, AUGUST 2012 4403 Joint Source

  5. Electron-electron scattering-induced channel hot electron injection in nanoscale n-channel metal-oxide-semiconductor field-effect-transistors with high-k/metal gate stacks

    SciTech Connect (OSTI)

    Tsai, Jyun-Yu; Liu, Kuan-Ju; Lu, Ying-Hsin; Liu, Xi-Wen [Department of Physics, National Sun Yat-Sen University, Kaohsiung, Taiwan (China); Chang, Ting-Chang [Department of Physics, National Sun Yat-Sen University, Kaohsiung, Taiwan (China); Advanced Optoelectronics Technology Center, National Cheng Kung University, Tainan, Taiwan (China); Chen, Ching-En; Ho, Szu-Han; Tseng, Tseung-Yuen [Department of Electronics Engineering, National Chiao Tung University, Hsinchu, Taiwan (China); Cheng, Osbert; Huang, Cheng-Tung; Lu, Ching-Sen [Device Department, United Microelectronics Corporation, Tainan Science Park, Tainan, Taiwan (China)

    2014-10-06

    This work investigates electron-electron scattering (EES)-induced channel hot electron (CHE) injection in nanoscale n-channel metal-oxide-semiconductor field-effect-transistors (n-MOSFETs) with high-k/metal gate stacks. Many groups have proposed new models (i.e., single-particle and multiple-particle process) to well explain the hot carrier degradation in nanoscale devices and all mechanisms focused on Si-H bond dissociation at the Si/SiO{sub 2} interface. However, for high-k dielectric devices, experiment results show that the channel hot carrier trapping in the pre-existing high-k bulk defects is the main degradation mechanism. Therefore, we propose a model of EES-induced CHE injection to illustrate the trapping-dominant mechanism in nanoscale n-MOSFETs with high-k/metal gate stacks.

  6. Figure 11 shows the reference irradiance spectrum proposed by Thuillier et al Figure 12 shows the Kitt Peak absolute irradiance spectrum smoothed using a 0.5

    E-Print Network [OSTI]

    Kurucz, Robert L.

    Figure 11 shows the reference irradiance spectrum proposed by Thuillier et al (2004). Figure 12 shows the Kitt Peak absolute irradiance spectrum smoothed using a 0.5 nm triangular bandpass irradiance spectrum subjectively normalized to the Thuillier et al irradiance spectrum. I recommend

  7. Two-Photon Luminescence Imaging of Bacillus Spores Using Peptide-Functionalized Gold Nanorods

    E-Print Network [OSTI]

    Cheng, Ji-Xin

    for detecting pathogenic microorganisms should be sufficiently sensitive to enable the rapid and accurate Bionanotechnology, nanorods, nonlinear optics, pathogen detection, peptides Introduction Optical modalities. These attributes give TPL and related imaging modalities the potential to detect individual pathogens in complex

  8. Watching Electrons Transfer from Metals to Insulators using Two Photon Photoemission

    E-Print Network [OSTI]

    Johns, James E.

    2010-01-01

    principles calculations of hot-electron lifetimes in metals.Harris, Femtosecond studies of electron tunneling at metal-M. , Electronic structure and electron dynamics at Si(100).

  9. Enhanced Background Rejection in Thick Tissue with Differential-Aberration Two-Photon Microscopy

    E-Print Network [OSTI]

    to superficial tissue damage, then the power density of the ballistic light near the surface can be so high and the ballistic light so weak that the power density of the ballistic light cannot compete at the beam focus can lead to significant power densities near the tissue surface. If the tissue

  10. Experimenting Liver Fibrosis Diagnostic by Two Photon Excitation Microscopy and Bag-of-Features Image Classification

    E-Print Network [OSTI]

    Stanciu, Stefan G.

    The accurate staging of liver fibrosis is of paramount importance to determine the state of disease progression, therapy responses, and to optimize disease treatment strategies. Non-linear optical microscopy techniques ...

  11. Excited state dynamics of liquid water: Insight from the dissociation reaction following two-photon excitation

    E-Print Network [OSTI]

    Elles, Christopher G.; Shkrob, Ilya A.; Crowell, Robert A.; Bradforth, Stephen E.

    2007-04-25

    of liquid water.30,31 The energy for verti- cal ionization of the liquid is about 11 eV, and the discrep- ancy implies that nuclear motion must play a role in the ionization mechanism at low energies.26 The precise relation- ship of dissociation... and probe pulses come from fre- quency conversion of the 800 nm light from an amplified Ti:sapphire laser consisting of an oscillator #1;Spectra Physics, Tsunami#2; and two consecutive multipass amplifiers. The la- ser system produces 1.6 mJ pulses with a 1...

  12. Non-local geometric phase in two-photon interferometry , O. Alibart1

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    in Hanbury Brown-Twiss polarized intensity interferometry. The experiment involves two independent, polar Brown and Twiss (HB-T), who performed inten- sity interferometry experiments using incoherent thermal

  13. Nonclassical effects in two-photon interference experiments: event-by-event simulations

    E-Print Network [OSTI]

    -photon interference experiments with two independent sources, like the Hanbury Brown-Twiss experiment: Interference, Hanbury Brown-Twiss experiment, Ghosh-Mandel experiment, quantum theory, discrete

  14. Three-Dimensional Nanostructures Formed by Single Step, Two-Photon

    E-Print Network [OSTI]

    Rogers, John A.

    patterning of 3D structures is possible, with simple setups in which all of the optics can be contained describe the fabrication of unusual classes of three-dimensional (3D) nanostructures using single step, two. Confocal imaging, computational studies, and 3D reconstructions reveal the essential aspects of the flow

  15. DOI: 10.1002/adfm.200800206 Lattice-Registered Two-Photon Polymerized Features within

    E-Print Network [OSTI]

    Braun, Paul

    . For certain 3D structures of sufficiently high dielectric contrast, a photonic bandgap (PBG) may result of controllably positioned predesigned defects (e.g., optical cavities) in these PBG materials[4] is in anology) allows for the controlled addition of high resolution defects into a 3D self-assembled colloidal crystal

  16. Optimization of Two-photon Excited Fluorescence Enhancement between Tunable and Broadband Femtosecond Laser Pulse Excitations 

    E-Print Network [OSTI]

    Wang, Chao

    2012-02-14

    . v ACKNOWLEDGEMENTS I would like to thank my committee chair, Dr. Alvin T. Yeh, and my committee members, Dr. George W. Kattawar, Dr. Kenith Meissner, and Dr. Mike McShane, for their guidance and support throughout the course of this research...

  17. Electron Dynamics and Symmetries at the Metal-Molecule Interface Probed by Two Photon Photoemission

    E-Print Network [OSTI]

    Muller, Eric Anton

    2012-01-01

    Future energy needs require the development of new, carbon neutral, and renewableenergy production in a future economy, because solar irradiation is one of the only renewable

  18. Higgs decay to two photons at one-loop in the SMEFT

    E-Print Network [OSTI]

    Christine Hartmann; Michael Trott

    2015-10-29

    We present the calculation of the $\\rm CP$ conserving contributions to $\\Gamma(h \\rightarrow \\gamma \\gamma)$, from dimension six operators at one-loop order, in the linear Standard Model Effective Field Theory. We discuss the impact of these corrections on interpreting current and future experimental bounds on this decay.

  19. Probing carrier lifetimes in photovoltaic materials using subsurface two-photon microscopy

    E-Print Network [OSTI]

    Barnard, Edward S.

    2014-01-01

    photoconductance, a new method for solar cell material andphotoluminescence studies of CdTe solar cells. J. Appl.high-efficiency Cu(In,Ga)Se? solar cells. Appl. Phys. Lett.

  20. Europium-Doped TiO2 Hollow Nanoshells: Two-Photon Imaging of Cell Binding

    E-Print Network [OSTI]

    Kummel, Andrew C.

    free for functionalization and the core free for payload encapsulation. Amine and holes are produced. These electrons and holes can react with hydroxyl ions or water to produce reactive hydroxyl radicals ·OH and perhydroxyl radicals HO2·. These oxygen species are also highly reactive

  1. Non-linear QCD dynamics in two-photon interactions at high energies

    SciTech Connect (OSTI)

    Carvalho, F.; Navarra, F. S.; Cazaroto, E.; Goncalves, V. P.

    2013-03-25

    Assuming that the dipole - dipole cross section can be related with the dipole - proton cross section, we calculate the total {gamma}{gamma}, {gamma}*{gamma}* cross-sections and the real photon structure function F{sup {gamma}}{sub 2}(x,Q{sup 2}) using the recent solution of the BK equation with running coupling constant.

  2. New method for measuring low NO concentrations using laser induced two photon ionization

    E-Print Network [OSTI]

    Lee, Shan-Hu

    and Technology, The University of Tokyo, Komaba 4-6-1, Meguro, Tokyo 153, Japan Received 28 January 1997 resulting from the D 2 X 2 transition was de- tected. Since the fluorescence occurs near 190 nm, a wave- length region free from laser generated background noise, signal-limited SL measurement conditions

  3. Two photon luminescence from quantum dots using broad and narrowband ultrafast laser pulses 

    E-Print Network [OSTI]

    Balasubramanian, Haribhaskar

    2009-05-15

    semiconductor nanocrystals or quantum dots (QD’s) both theoretically and experimentally. Compared to standard organic dyes, QD’s possess a relatively broad, uniform spectral response that enables better use of the full bandwidth from the broadband laser...

  4. Higgs decay to two photons at one-loop in the SMEFT

    E-Print Network [OSTI]

    Hartmann, Christine

    2015-01-01

    We present the calculation of the $\\rm CP$ conserving contributions to $\\Gamma(h \\rightarrow \\gamma \\gamma)$, from dimension six operators at one-loop order, in the linear Standard Model Effective Field Theory. We discuss the impact of these corrections on interpreting current and future experimental bounds on this decay.

  5. Watching Electrons Transfer from Metals to Insulators using Two Photon Photoemission

    E-Print Network [OSTI]

    Johns, James

    2010-01-01

    charges out of an organic solar cell or injecting them intothe P3HT/PCBM class of organic solar cells 55-59 . Previousmolecules used in many organic solar cells 60 and because

  6. Role of noise operators on two-photon correlations in an extended coherent Raman medium 

    E-Print Network [OSTI]

    Ooi, C. H. Raymond; Zubairy, M. Suhail.

    2007-01-01

    An extended medium driven in a double Raman configuration generates Stokes and anti-Stokes fields that are described by coupled parametric oscillator equations with solutions that depend on input boundary operators and quantum noise operators. We...

  7. QCD and Two-Photon Physics Editors: L. Orr, B. Schumm

    E-Print Network [OSTI]

    California at Santa Cruz, University of

    , is expected to provide a significant contribution to the physics program at a high energy e+ e- colliding beam nuclear interaction. Highlights unique to the e+ e- QCD program include the discovery of the gluon gauge error on s(M2 Z) below 0.5% would be achieved. At energies far above the Z0 pole, the electron

  8. Reconstruction of a multimode entangled state using a two-photon phase-sensitive linear amplifier 

    E-Print Network [OSTI]

    Ahmad, M.; Qamar, S.; Zubairy, M. Suhail

    2003-01-01

    inverse Radon transformation. This scheme is insensitive to the noise associated with the nonunit efficiency of the detector in the homodyne detection measurement scheme....

  9. Microphotonic parabolic light directors fabricated by two-photon lithography J. H. Atwater,1,a)

    E-Print Network [OSTI]

    Polman, Albert

    in the form of compound parabolic concentrators via direct laser write li- thography. Microphotonic parabolic light directors for producing collimated beams for applications in advanced solar cell and light light directors employ the well-known focusing properties of compound parabolic con- centrators, which

  10. Electron Dynamics and Symmetries at the Metal-Molecule Interface Probed by Two Photon Photoemission

    E-Print Network [OSTI]

    Muller, Eric Anton

    2012-01-01

    Left: Simulated LEED spectrum for CuPc/Ag(111) produced bydots. Right: Experimental LEED spectrum obtained for CuPc/symmetry directions. C) Predicted LEED for FePc/Ag(111). D)

  11. Two-photon Photoemission of Organic Semiconductor Molecules on Ag(111)

    E-Print Network [OSTI]

    Yang, Aram

    2008-01-01

    LEED . . . . . . . . . . .properties . . . 4.3.2 LEED . . . . . . . . . . . . .4.3.34.4.1 Dosing survey . . . . . 4.4.2 LEED . . . . . . . . .

  12. Electronic structure of liquid water from polarization-dependent two-photon absorption spectroscopy

    E-Print Network [OSTI]

    Elles, Christopher G.; Rivera, Christopher A.; Zhang, Yuyuan; Pieniazek, Piotr A.; Bradforth, Stephen E.

    2009-02-26

    and connects the 2PA spectrum with previous one-photon absorption, photoelectron, and x-ray absorptionspectroscopy measurements of liquid water. Previously unresolved, overlapping transitions are assigned for the first time. Finally, the electronic character...

  13. Self-standing aligned fiber scaffold fabrication by two photon photopolymerization

    E-Print Network [OSTI]

    Hidai, Hirofumi; Jeon, Hojeong; Hwang, David J.; Grigoropoulos, Costas P.

    2009-01-01

    008-9274-4 Self-standing aligned fiber scaffold fabricationa method for fabricating self-standing fiber scaf- folds bylargely due to lack of self-standing, position controllable

  14. Resonant Two-Photon Ionization Mass Spectrometry of Jet-Cooled Phenolic Acids and

    E-Print Network [OSTI]

    de Vries, Mattanjah S.

    , protocatechuic acid, syringic acid, vanillic acid, and trans-resveratrol are vibronically resolved and distinct of antioxidants and secondary metabolites.1 trans-Resveratrol, a polyphenol, is produced by a variety of plants in trans-resveratrol in recent years due to its anticancer4 and antiaging5,6 effects as well as its

  15. Birth of colliding beams in Europe, two photon studies at Adone

    E-Print Network [OSTI]

    Bonolis, Luisa

    2015-01-01

    This article recalls the birth of the first electron-positron storage ring AdA, and the construction of the higher energy collider ADONE, where early photon-photon collisions were observed. The events which led the Austrian physicist Bruno Touschek to propose and construct AdA will be recalled, starting with early work on the Wideroe's betatron during World War II, up to the construction of ADONE, and the theoretical contribution to radiative corrections to electron-positron collisions.

  16. Birth of colliding beams in Europe, two photon studies at Adone

    E-Print Network [OSTI]

    Luisa Bonolis; Giulia Pancheri

    2015-11-02

    This article recalls the birth of the first electron-positron storage ring AdA, and the construction of the higher energy collider ADONE, where early photon-photon collisions were observed. The events which led the Austrian physicist Bruno Touschek to propose and construct AdA will be recalled, starting with early work on the Wideroe's betatron during World War II, up to the construction of ADONE, and the theoretical contribution to radiative corrections to electron-positron collisions.

  17. Two-Photon Study on the Electronic Interactions between the First Excited

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservationBio-Inspired SolarAbout /Two Electron Holes in Hematite FacilitateTwoEnergySinglet

  18. Size Dependence of Two-Photon Absorption in Semiconductor Quantum Dots

    Office of Scientific and Technical Information (OSTI)

    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 Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail. (Conference)Feedback System in the CERN SPS(Journal Article) | SciTech Connect

  19. Multi-channel conduction in redox-based resistive switch modelled using quantum point contact theory

    SciTech Connect (OSTI)

    Miranda, E., E-mail: enrique.miranda@uab.cat; Suñé, J. [Departament d'Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallés, Barcelona (Spain)] [Departament d'Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallés, Barcelona (Spain); Mehonic, A.; Kenyon, A. J. [Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE (United Kingdom)] [Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE (United Kingdom)

    2013-11-25

    A simple analytic model for the electron transport through filamentary-type structures in Si-rich silica (SiO{sub x})-based resistive switches is proposed. The model is based on a mesoscopic description and is able to account for the linear and nonlinear components of conductance that arise from both fully and partially formed conductive channels spanning the dielectric film. Channels are represented by arrays of identical scatterers whose number and quantum transmission properties determine the current magnitude in the low and high resistance states. We show that the proposed model not only reproduces the experimental current-voltage (I-V) characteristics but also the normalized differential conductance (dln(I)/dln(V)-V) curves of devices under test.

  20. Microfluidic pumping through miniaturized channels driven by ultra-high frequency surface acoustic waves

    SciTech Connect (OSTI)

    Shilton, Richie J.; Travagliati, Marco; Beltram, Fabio; Cecchini, Marco

    2014-08-18

    Surface acoustic waves (SAWs) are an effective means to pump fluids through microchannel arrays within fully portable systems. The SAW-driven acoustic counterflow pumping process relies on a cascade phenomenon consisting of SAW transmission through the microchannel, SAW-driven fluid atomization, and subsequent coalescence. Here, we investigate miniaturization of device design, and study both SAW transmission through microchannels and the onset of SAW-driven atomization up to the ultra-high-frequency regime. Within the frequency range from 47.8 MHz to 754?MHz, we show that the acoustic power required to initiate SAW atomization remains constant, while transmission through microchannels is most effective when the channel widths w???10??, where ? is the SAW wavelength. By exploiting the enhanced SAW transmission through narrower channels at ultra-high frequencies, we discuss the relevant frequency-dependent length scales and demonstrate the scaling down of internal flow patterns and discuss their impact on device miniaturization strategies.

  1. Methods for consistent forewarning of critical events across multiple data channels

    DOE Patents [OSTI]

    Hively, Lee M.

    2006-11-21

    This invention teaches further method improvements to forewarn of critical events via phase-space dissimilarity analysis of data from biomedical equipment, mechanical devices, and other physical processes. One improvement involves conversion of time-serial data into equiprobable symbols. A second improvement is a method to maximize the channel-consistent total-true rate of forewarning from a plurality of data channels over multiple data sets from the same patient or process. This total-true rate requires resolution of the forewarning indications into true positives, true negatives, false positives and false negatives. A third improvement is the use of various objective functions, as derived from the phase-space dissimilarity measures, to give the best forewarning indication. A fourth improvement uses various search strategies over the phase-space analysis parameters to maximize said objective functions. A fifth improvement shows the usefulness of the method for various biomedical and machine applications.

  2. World's Thinnest Proton Channel | ornl.gov

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

    show that experimental observations of unimpeded proton transfer throughsingle-layer graphene occur via a classic "bucket-line" mechanism first proposed in 1806. Graphene is a...

  3. Coupled cluster channels in the homogeneous electron gas

    SciTech Connect (OSTI)

    Shepherd, James J. E-mail: jamesjshepherd@gmail.com; Henderson, Thomas M.; Scuseria, Gustavo E.

    2014-03-28

    We discuss diagrammatic modifications to the coupled cluster doubles (CCD) equations, wherein different groups of terms out of rings, ladders, crossed-rings, and mosaics can be removed to form approximations to the coupled cluster method, of interest due to their similarity with various types of random phase approximations. The finite uniform electron gas (UEG) is benchmarked for 14- and 54-electron systems at the complete basis set limit over a wide density range and performance of different flavours of CCD is determined. These results confirm that rings generally overcorrelate and ladders generally undercorrelate; mosaics-only CCD yields a result surprisingly close to CCD. We use a recently developed numerical analysis [J. J. Shepherd and A. Grüneis, Phys. Rev. Lett. 110, 226401 (2013)] to study the behaviours of these methods in the thermodynamic limit. We determine that the mosaics, on forming the Brueckner one-body Hamiltonian, open a gap in the effective one-particle eigenvalues at the Fermi energy. Numerical evidence is presented which shows that methods based on this renormalisation have convergent energies in the thermodynamic limit including mosaic-only CCD, which is just a renormalised MP2. All other methods including only a single channel, namely, ladder-only CCD, ring-only CCD, and crossed-ring-only CCD, appear to yield divergent energies; incorporation of mosaic terms prevents this from happening.

  4. Relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal

    E-Print Network [OSTI]

    L. Bandiera; A. Mazzolari; E. Bagli; G. Germogli; V. Guidi; A. Sytov; I. V. Kirillin; N. F. Shul'ga; A. Berra; D. Lietti; M. Prest; D. De Salvador; E. Vallazza

    2015-11-10

    An investigation on the mechanism of relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal was carried out at the extracted line H8 from CERN Super Proton Synchrotron. The experimental results were critically compared to computer simulations, showing a good agreement. We firmly individuated a necessary condition for the exploitation of axial confinement or its relaxation for particle beam manipulation in high-energy accelerators. We demonstrated that with a short bent crystal, aligned with one of its main axis to the beam direction, it is possible to realize either a total beam steerer or a beam splitter with adjustable intensity. In particular, in the latter case, a complete relaxation from axial confinement to planar channeling takes place, resulting in beam splitting into the two strongest skew planar channels.

  5. Relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal

    E-Print Network [OSTI]

    Bandiera, L; Bagli, E; Germogli, G; Guidi, V; Sytov, A; Kirillin, I V; Shul'ga, N F; Berra, A; Lietti, D; Prest, M; De Salvador, D; Vallazza, E

    2015-01-01

    An investigation on the mechanism of relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal was carried out at the extracted line H8 from CERN Super Proton Synchrotron. The experimental results were critically compared to computer simulations, showing a good agreement. We firmly individuated a necessary condition for the exploitation of axial confinement or its relaxation for particle beam manipulation in high-energy accelerators. We demonstrated that with a short bent crystal, aligned with one of its main axis to the beam direction, it is possible to realize either a total beam steerer or a beam splitter with adjustable intensity. In particular, in the latter case, a complete relaxation from axial confinement to planar channeling takes place, resulting in beam splitting into the two strongest skew planar channels.

  6. Quantum channel for the transmission of information

    DOE Patents [OSTI]

    Dress, William B.; Kisner, Roger A.; Richards, Roger K.

    2004-01-13

    Systems and methods are described for a quantum channel for the transmission of information. A method includes: down converting a beam of coherent energy to provide a beam of multi-color entangled photons; converging two spatially resolved portions of the beam of multi-color entangled photons into a converged multi-color entangled photon beam; changing a phase of at least a portion of the converged multi-color entangled photon beam to generate a first interferometric multi-color entangled photon beam; combining the first interferometric multi-color entangled photon beam with a second interferometric multi-color entangled photon beam within a single beam splitter; wherein combining includes erasing energy and momentum characteristics from both the first interferometric multi-color entangled photon beam and the second interferometric multi-color entangled photon beam; splitting the first interferometric multi-color entangled photon beam and the second interferometric multi-color entangled photon beam within the single beam splitter, wherein splitting yields a first output beam of multi-color entangled photons and a second output beam of multi-color entangled photons; and modulating the first output beam of multi-color entangled photons.

  7. Muon Beam Helical Cooling Channel Design

    SciTech Connect (OSTI)

    Johnson, Rolland; Ankenbrandt, Charles; Flanagan, G.; Kazakevich, G.M.; Marhauser, Frank; Neubauer, Michael; Roberts, T.; Yoshikawa, C.; Derbenev, Yaroslav; Morozov, Vasiliy; Kashikhin, V.S.; Lopes, Mattlock; Tollestrup, A.; Yonehara, Katsuya; Zloblin, A.

    2013-06-01

    The Helical Cooling Channel (HCC) achieves effective ionization cooling of the six-dimensional (6d) phase space of a muon beam by means of a series of 21st century inventions. In the HCC, hydrogen-pressurized RF cavities enable high RF gradients in strong external magnetic fields. The theory of the HCC, which requires a magnetic field with solenoid, helical dipole, and helical quadrupole components, demonstrates that dispersion in the gaseous hydrogen energy absorber provides effective emittance exchange to enable longitudinal ionization cooling. The 10-year development of a practical implementation of a muon-beam cooling device has involved a series of technical innovations and experiments that imply that an HCC of less than 300 m length can cool the 6d emittance of a muon beam by six orders of magnitude. We describe the design and construction plans for a prototype HCC module based on oxygen-doped hydrogen-pressurized RF cavities that are loaded with dielectric, fed by magnetrons, and operate in a superconducting helical solenoid magnet.

  8. The Bulk Channel in Thermal Gauge Theories

    E-Print Network [OSTI]

    Harvey B. Meyer

    2010-02-17

    We investigate the thermal correlator of the trace of the energy-momentum tensor in the SU(3) Yang-Mills theory. Our goal is to constrain the spectral function in that channel, whose low-frequency part determines the bulk viscosity. We focus on the thermal modification of the spectral function, $\\rho(\\omega,T)-\\rho(\\omega,0)$. Using the operator-product expansion we give the high-frequency behavior of this difference in terms of thermodynamic potentials. We take into account the presence of an exact delta function located at the origin, which had been missed in previous analyses. We then combine the bulk sum rule and a Monte-Carlo evaluation of the Euclidean correlator to determine the intervals of frequency where the spectral density is enhanced or depleted by thermal effects. We find evidence that the thermal spectral density is non-zero for frequencies below the scalar glueball mass $m$ and is significantly depleted for $m\\lesssim\\omega\\lesssim 3m$.

  9. Classical capacity of Gaussian communication under a single noisy channel

    E-Print Network [OSTI]

    Jaehak Lee; Se-Wan Ji; Jiyong Park; Hyunchul Nha

    2015-05-06

    A long-standing problem on the classical capacity of bosonic Gaussian channels has recently been resolved by proving the minimum output entropy conjecture. It is also known that the ultimate capacity quantified by the Holevo bound can be achieved asymptotically by using an infinite number of channels. However, it is less understood to what extent the communication capacity can be reached if one uses a finite number of channels, which is a topic of practical importance. In this paper, we study the capacity of Gaussian communication, i.e., employing Gaussian states and Gaussian measurements to encode and decode information under a single-channel use. We prove that the optimal capacity of single-channel Gaussian communication is achieved by one of two well-known protocols, i.e., coherent-state communication or squeezed-state communication, depending on the energy (number of photons) as well as the characteristics of the channel. Our result suggests that the coherent-state scheme known to achieve the ultimate information-theoretic capacity is not a practically optimal scheme for the case of using a finite number of channels. We find that overall the squeezed-state communication is optimal in a small-photon-number regime whereas the coherent-state communication performs better in a large-photon-number regime.

  10. Progress on Superconducting Magnets for the MICE Cooling Channel

    SciTech Connect (OSTI)

    Green, Michael A; Virostek, Steve P.; Li, Derun; Zisman, Michael S.; Wang, Li; Pan, Heng; Wu, Hong; Guo, XingLong; Xu, FengYu; Liu, X. K.; Zheng, S. X.; Bradshaw, Thomas; Baynham, Elwyn; Cobb, John; Lau, Wing; Lau, Peter; Yang, Stephanie Q.

    2009-09-09

    The muon ionization cooling experiment (MICE) consists of a target, a beam line, a pion decay channel, the MICE cooling channel. Superconducting magnets are used in the pion decay channel and the MICE cooling channel. This report describes the MICE cooling channel magnets and the progress in the design and fabrication of these magnets. The MICE cooling channel consists of three types of superconducting solenoids; the spectrometer solenoids, the coupling solenoids and the focusing solenoids. The three types of magnets are being fabricated in he United States, China, and the United Kingdom respectively. The spectrometer magnets are used to analyze the muon beam before and after muon cooling. The coupling magnets couple the focusing sections and keep the muon beam contained within the iris of the RF cavities that re used to recover the muon momentum lost during ionization cooling. The focusing magnets focus the muon beam in the center of a liquid hydrogen absorber. The first of the cooling channel magnets will be operational in MICE in the spring of 2010.

  11. Demodulation of a positron beam in a bent crystal channel

    E-Print Network [OSTI]

    Kostyuk, A; Solov'yov, A V; Greiner, W

    2011-01-01

    The evolution of a modulated positron beam in a planar crystal channel is investigated within the diffusion approach. A detailed description of the formalism is given. A new parameter, the demodulation length, is introduced, representing the quantitative measure of the depth at which the channelling beam preserves its modulation in the crystal. It is demonstrated that there exist crystal channels with the demodulation length sufficiently large for using the crystalline undulator as a coherent source of hard X rays. This finding is a crucial milestone in developing a new type of lasers radiating in the hard X ray and gamma ray range.

  12. Information-Theoretically Secure Communication Under Channel Uncertainty 

    E-Print Network [OSTI]

    Ly, Hung Dinh

    2012-07-16

    for the legitimate receiver and the eavesdropper channel respectively, and N1 and N2 are additive white Gaussian noise with zero means and unit variances. The secrecy capacity of the channel was characterized in [5] and can be written as Cs(P, a, b) = [ 1 2... log(1 + aP )? 1 2 log(1 + bP ) ]+ (1.6) where [x]+ := max(0, x). Note from (1.6) that Cs(P, a, b) > 0 if and only if a > b. That is, for the Gaussian wiretap channel (1.4), asymptotic perfect secrecy commu- nication is possible if and only...

  13. Cold plate with combined inclined impingement and ribbed channels

    DOE Patents [OSTI]

    Parida, Pritish R.

    2015-12-22

    Heat transfer devices and methods for making the same that include a first enclosure having at least one inlet port; a second enclosure having a bottom plate and one or more dividing walls to establish channels, at least one internal surface of each channel having rib structures to create turbulence in a fluid flow; and a jet plate connecting the first enclosure and the second enclosure having impinging jets that convey fluid from the first enclosure to the channels, said impinging jets being set at an angular deviation from normal to cause local acceleration of fluid and to increase a local heat transfer rate.

  14. Turbine component cooling channel mesh with intersection chambers

    DOE Patents [OSTI]

    Lee, Ching-Pang; Marra, John J

    2014-05-06

    A mesh (35) of cooling channels (35A, 35B) with an array of cooling channel intersections (42) in a wall (21, 22) of a turbine component. A mixing chamber (42A-C) at each intersection is wider (W1, W2)) than a width (W) of each of the cooling channels connected to the mixing chamber. The mixing chamber promotes swirl, and slows the coolant for more efficient and uniform cooling. A series of cooling meshes (M1, M2) may be separated by mixing manifolds (44), which may have film cooling holes (46) and/or coolant refresher holes (48).

  15. Roderick MacKinnon and Ion Channels - Potassium Channels and Sodium

    Office of Scientific and Technical Information (OSTI)

    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 Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding access toSmall ReactorRaymond Davis,Robert Curl, Jr.Channels

  16. Aperture-Tolerant, Chemical-Based Methods to Reduce Channeling

    SciTech Connect (OSTI)

    Randall S. Seright

    2007-09-30

    This final technical progress report describes work performed from October 1, 2004, through May 16, 2007, for the project, 'Aperture-Tolerant, Chemical-Based Methods to Reduce Channeling'. We explored the potential of pore-filling gels for reducing excess water production from both fractured and unfractured production wells. Several gel formulations were identified that met the requirements--i.e., providing water residual resistance factors greater than 2,000 and ultimate oil residual resistance factors (F{sub rro}) of 2 or less. Significant oil throughput was required to achieve low F{sub rro} values, suggesting that gelant penetration into porous rock must be small (a few feet or less) for existing pore-filling gels to provide effective disproportionate permeability reduction. Compared with adsorbed polymers and weak gels, strong pore-filling gels can provide greater reliability and behavior that is insensitive to the initial rock permeability. Guidance is provided on where relative-permeability-modification/disproportionate-permeability-reduction treatments can be successfully applied for use in either oil or gas production wells. When properly designed and executed, these treatments can be successfully applied to a limited range of oilfield excessive-water-production problems. We examined whether gel rheology can explain behavior during extrusion through fractures. The rheology behavior of the gels tested showed a strong parallel to the results obtained from previous gel extrusion experiments. However, for a given aperture (fracture width or plate-plate separation), the pressure gradients measured during the gel extrusion experiments were much higher than anticipated from rheology measurements. Extensive experiments established that wall slip and first normal stress difference were not responsible for the pressure gradient discrepancy. To explain the discrepancy, we noted that the aperture for gel flow (for mobile gel wormholing through concentrated immobile gel within the fracture) was much narrower than the width of the fracture. The potential of various approaches were investigated for improving sweep in parts of the Daqing Oil Field that have been EOR targets. Possibilities included (1) gel treatments that are directed at channeling through fractures, (2) colloidal dispersion gels, (3) reduced polymer degradation, (4) more viscous polymer solutions, and (5) foams and other methods. Fractures were present in a number of Daqing wells (both injectors and producers). Because the fractures were narrow far from the wellbore, severe channeling did not occur. On the contrary, fractures near the wellbore aided reservoir sweep. In the February 2006 issue of the Journal of Petroleum Technology, a 'Distinguished-Author-Series' paper claimed that a process using aqueous colloidal dispersion gels (CDG gels) performed superior to polymer flooding. Unfortunately, this claim is misleading and generally incorrect. Colloidal dispersion gels, in their present state of technological development, should not be advocated as an improvement to, or substitute for, polymer flooding.

  17. Feedback between erosional morphology, sediment transport and abrasion in the transient adjustment of fluvial bedrock channels

    E-Print Network [OSTI]

    Johnson, Joel Peterson

    2007-01-01

    This thesis explores the dependence of bedrock channel incision on coarse sediment supply through laboratory flume experiments and quantitative field observations of evolving channel morphology. Predictions of the ...

  18. REVIEW OF PROGRESS Advice Sheet for Students asked to `Show Cause'

    E-Print Network [OSTI]

    Fleming, Andrew J.

    REVIEW OF PROGRESS Advice Sheet for Students asked to `Show Cause' December 2013 Page 1 of 2 CRICOS process is called `Show Cause'. Please note, if a fail grade changes and you are no longer `Show Cause' you will revert back to an `At Risk' status What does `Show Cause' mean for you? You are required

  19. Analysis of powder compaction process through equal channel angular extrusion 

    E-Print Network [OSTI]

    Kaushik, Anshul

    2009-05-15

    A thermodynamic framework was presented for the development of powderconstitutive models. The process of powder compaction through Equal ChannelAngular Extrusion (ECAE) at room temperature was modeled using the finiteelement ...

  20. Dynamic channel allocation in satellite and wireless networks

    E-Print Network [OSTI]

    Sun, Jun, 1975-

    2007-01-01

    The objective of this thesis is to understand how to utilize wireless channels in a fair and efficient manner within a multi-users communication environment. We start by exploring the allocation of a single wireless downlink ...