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Displaying records 51 to 60 of 231 records.
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51. In Search of a New Primary GPS Receiver for NIST
Topic: Physics
Published: 11/26/2012
Author: Marc Abbott Weiss
Abstract: A previous publication showed problems with the current NIST Time and Frequency Division primary GPS receiver [1] when used for Precise Point Positioning (PPP)-based carrier phase time transfer. We confirm that, for this receiver, boundary discontinu ...

52. Infrared hemispherical reflectance of carbon nanotube mats and arrays in the 5 µm to 50 µm wavelength region
Topic: Physics
Published: 11/1/2012
Authors: Chris Chunnilall, Aric Warner Sanders, John H Lehman, Evangelos Theocharous
Abstract: We present the absolute infrared (5 {u}m to 50 {u}m) hemispherical reflectance of films produced from commercially available carbon nanotubes. Data were obtained using the upgraded NPL directional- hemispherical reflectance measurement facility. A b ...

53. Interstellar Carbodiimide (HNCNH) - A New Astronomical Detection from the GBT PRIMOS Survey via Maser Emission Features
Topic: Physics
Published: 10/1/2012
Authors: Brett A. McGuire, Ryan A. Loomis, Cameron M. Charness, Geoffery A. Blake, Jan M. Hollis, Francis John Lovas, Philip R. Jewell, Anthony J. Remijan
Abstract: Historically, searches for new astronomical molecules resulted in the detection of favorable, high line strength transitions based on a thermal approximation to the excitation of these species in interstellar environments. Given the temperatures of ...

54. Multiexciton dynamics in infrared-emitting colloidal nanostructures probed by a superconducting nanowire single-photon detector
Topic: Physics
Published: 9/30/2012
Authors: Richard L Sandberg, Lazaro A. Padilha, Mumtaz Qazilbash, Wan Ki Bae, Richard D. Schaller, Jeffrey M. Pietryga, Martin J Stevens, Burm Baek, Sae Woo Nam, Victor I. Klimov
Abstract: Carrier multiplication (CM) is the process in which absorption of a single photon produces multiple electron-hole pairs. Here, we evaluate the effect of particle shape on CM efficiency by conducting a comparative study of spherical nanocrystal qu ...

55. Performance of the NIST goniometer with a broad-band source and multichannel CCD based spectrometer
Topic: Physics
Published: 9/20/2012
Authors: Vyacheslav B Podobedov, Maria E Nadal, Carl C Miller

56. Ultrafast manetization enhancement in metallic multilayers driven by superdiffusive spin current
Topic: Physics
Published: 9/4/2012
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Dennis Rudolf, Chan La-O-Vorakiat, Marco Battiato, Roman Adam, Emrah Turgut, Stefan Mathias, Margaret M. Murnane, Henry C. Kapteyn, Claus M. Schneider
Abstract: Uncovering the physical mechanisms that govern ultrafast charge and spin dynamics is crucial for understanding correlated matter as well as the fundamental limits of ultrafast spin-based electronics. Spin dynamics in magnetic materials can be driven ...

57. Determination of graphene work function and graphene-insulator-semiconductor band alignment by internal photoemission spectroscopy
Topic: Physics
Published: 7/11/2012
Authors: Rusen Yan, Qin Q. Zhang, Wei Li, Irene G. Calizo, Tian T. Shen, Curt A Richter, Angela R Hight Walker, Xuelei X. Liang, David J Gundlach, Nhan V Nguyen, Huili Grace Xing, Alan Seabaugh
Abstract: We determined the band alignment of a graphene-oxide-silicon structure using internal photoemission spectroscopy. From the flatband voltage and Dirac voltage we infer a 4.3  10e11 cm-2 negative extrinsic charge present on the graphene surface. Als ...

58. Propagation of Vortex Electron Wave Functions in a Magnetic Field
Topic: Physics
Published: 7/5/2012
Authors: Gregg M. Gallatin, Ben McMorran
Abstract: The physics of coherent beams of photons carrying axial orbital angular momentum (OAM) is well understood and such beams, sometimes known as vortex beams, have found applications in optics and microscopy. Recently electron beams carrying very large ...

59. In-situ Polarized 3He system for the Magnetism Reflectometer at the Spallation Neutron Source
Topic: Physics
Published: 7/2/2012
Authors: Thomas R Gentile, X Tong, C Y Jiang, V Lauter, H. Ambaye, D. Brown, L Crow, R J Goyette, W-T Lee, A. Parizzi
Abstract: We report on the in-situ polarized 3He neutron polarization analyzer developed for the time-of-flight Magnetism Reflectometer (MAGICS) at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). Using the spin exchange optical ...

60. Ancilla assisted calibration of a measuring apparatus
Topic: Physics
Published: 6/19/2012
Authors: Alan L Migdall, Giorgio Brida, L. Ciavarella, Ivo Pietro Degiovanni, Marco Genovese, M. G. Mingolla, M. G. A. Paris, Fabrizio Piacentini, S. V. Polyakov
Abstract: The rapid development of quantum systems has enabled a wide range of novel and innovative technologies, from quantum information processing to quantum etrology and imaging [1{13], mainly based on optical systems. Precise characterization techniques o ...

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