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Topic Area: Physics

Displaying records 81 to 90 of 705 records.
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81. GPS Carrier-Phase Time Transfer Boundary Discontinuity Investigation
Topic: Physics
Published: 11/26/2012
Authors: Jian Yao, Judah Levine
Abstract: We report on a study of the carrier-phase time transfer boundary discontinuity by the use of the precise point positioning (PPP) technique. Carrier-phase time transfer is first compared with two-way satellite time and frequency transfer (TWSTFT) bet ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912772

82. In Search of a New Primary GPS Receiver for NIST
Topic: Physics
Published: 11/26/2012
Author: Marc A 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912972

83. Measurement of the velocity of the neutrino with MINOS
Topic: Physics
Published: 11/26/2012
Authors: Stefania Romisch, P Adamson, Neil Ashby, G. Barr, M. Bishal, A. Blake, G. J. Bock, D. Bogert, Russell Bumgarner, S. V. Cao, S. Childress, M. Christensen, J. Coelho, L. Corwin, D. CroninHennessy, J. K. de Jong, N. E. Devenish, M. V. Diwan, C. O. Escobar, J. J. Evans, E. Falk, G. J. Feldman, C. Flores, B. Fonville, M. V. Frohne, H. R. Gallager, A. Gavrilenko, R. A. Gomes, P. Gouffon, N. Graf, R. Gran, K. Grzelak, A. Habig, J. Hartnell, R. Hatcher, Jonathan Hirschauer, A. Holin, J. Hylen, G M. Irwin, Z. isvan, C. James, Steven R Jefferts, D. Jensen, T. Kafka, S. Kasahara, G. Koizumi, M. Kordosky, A. Kreymer, K. Lang, J. Ling, P. J. Litchfield, P. Lucas, W. A. Mann, M. L. Marshak, M. Mathis, Demetrios Matsakis, N. Mayer, Angela Mckinley, M. M. Medeiros, R. Mehdiyev, J. R. Meier, B. Mercurio, M. D. Messier, W. H. Miller, S. R. Mishra, S. Moed Sher, C. D. Moore, L. Mualem, J. A. Musser, J. K. Nelson, H. Newman, R. J. Nichol, J. A. Nowak, J. C. O'Conner, W. P. Oliver, M. Orchanian, R. B. Pahlka, J. Paley, Thomas Edward Parker, R. B. Patterson, G. Pawloski, S. PhanBudd, R. K. Plunkett, N. Poonthattatil, Ed Powers, X. Qiu, A. Radovic, B. Rebel, C. Rosenfeld, H. A. Rubin, M. C. Sanchez, J. Schneps, P Schireiner, A. Schreckenberger, R. Sharma, A, Sousa, N. Tagg, R, L. Talaga, J. Thomas, M. A. Thomson, X. Tian, S. C. Tognini, R. Toner, D. Torretta, G. Tzanakos, J. Urheim, P. Vahel, A. Webber, R. C. Webb, C. White, L. H. Whitehead, L. Whitehead, K. P. Wilson, S. G. Wojcicki, J. Wright, Victor Shufang Zhang, R. Zwaska
Abstract: The MINOS experiment uses a beam of predominantly muon-type neutrinos generated using protons from the Main Injector at Fermilab in Batavia, IL and travelling 735 km through the Earth to a disused iron mine in Soudan, MN. The 10 us-long beam pulse co ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913274

84. Recent Calibrations of UTC(NIST) and UTC(USNO)
Topic: Physics
Published: 11/26/2012
Authors: Victor Shufang Zhang, Thomas Edward Parker, Russell Bumgarner, Jonathan Hirschauer, Angela Mckinley, Stephen Mitchell, Ed Powers, Jim Skinner, Demetrios Matsakis
Abstract: The National Institute of Standards and Technology (NIST) and the United States Naval Observatory (USNO) use GPS common-view, carrier-phase time transfer and Two Way Satellite Time and Frequency Transfer (TWSTFT, also known as TWSTT) techniques in ou ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912837

85. Replicating UTC(NIST) at Remote Sites
Topic: Physics
Published: 11/26/2012
Authors: Michael A Lombardi, Andrew N Novick, J. Mauricio Lopez-Romero, Rodrigo Ramos
Abstract: The National Institute of Standards and Technology (NIST) is deploying disciplined oscillators that are referenced to the UTC(NIST) time scale through common-view observations of Global Positioning System (GPS) satellites. We present measurement res ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912711

86. Synchronization between remote sites for the MINOS experiment
Topic: Physics
Published: 11/26/2012
Authors: Stefania Romisch, Steven R Jefferts, Victor Shufang Zhang, Thomas Edward Parker, Neil Ashby, P Adamson, G. Barr, A. Habig, J Meier, C. James, R. Nicol, R. Plunkett, C. Rosenfeld, Russell Bumgarner, M. Christensen, Jonathan Hirschauer, B. Fonville, Demetrios Matsakis, Ed Powers, J. Wright, Angela Mckinley
Abstract: In the context of time-of-flight measurements, the timing at the departure and arrival locations is obviously critical to the outcome of the experiment. In the case of neutrino time-of-flight experiments, the locations are many hundreds of kilometer ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913108

87. Ultra-low noise regenerative frequency divider
Topic: Physics
Published: 11/11/2012
Authors: Archita Hati, Craig W Nelson, Corey Andrew Barnes, Danielle Grace Lirette, Jason A. (Jason) DeSalvo, David Allan Howe
Abstract: We designed ultra-low noise regenerative divider-by-2 circuits that operate at input frequencies of 20 MHz and 10 MHz. We achieved residual output-referred single-sideband phase noise below -162 dBc/Hz at 10 Hz offset for a single divider at these f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910794

88. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910058

89. Broadband mid-infrared frequency upconversion with a aperiodically-poled LiNbO3 waveguide
Topic: Physics
Published: 10/15/2012
Authors: Tyler W. Neely, Lora L Nugent-Glandorf, Florian B. (Florian) Adler, Scott A Diddams
Abstract: We convert a mid-infrared frequency comb to near-infrared wavelengths through sum-frequency generation in an aperiodically poled ZnO:LiNBO3 waveguide. Conversion across a bandwidth of 2.5 {mu}m - 4.5 {mu}m is demonstrated in a single device, with inc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911472

90. Absolute absorption and dispersion of a rubidium vapour in the hyperfine Paschen-Back regime
Topic: Physics
Published: 10/4/2012
Authors: Svenja A Knappe, L. Weller, K.S. Kleinbach, M.A. Zentile, C.S. Adams, I.G. Hughes
Abstract: Here we report on measurements of the absolute absorption and dispersion properties of an isotopically pure 87Rb vapour for magnetic fields up to and including 0.6 T. We discuss the various regimes which arise when the hyperfine and Zeeman interactio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911987



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