Now showing items 112-131 of 845

    • Daily Precipitation Generation using a Hidden Markov Model with Correlated Emissions for the Potomac River Basin 

      Kroiz, Gerson C.; Majumder, Reetam; Gobbert, Matthias K.; Neerchal, Nagaraj K.; Markert, Kel; Mehta, Amita (UMBC, 2020-06-30)
      A daily precipitation generator based on a hidden Markov model with Gaussian copulas (HMM-GC) is constructed using remote sensing data from GPM-IMERG for the Potomac river basin on the East Coast of the USA. Daily ...
    • The dark knight falters 

      Mirabal, N. (Oxford University Press, 2013-02-11)
      Tentative line emission at 111 and 129 GeV from 16 unassociated Fermi-LAT point sources has been reported recently by Su and Finkbeiner. Together with similar features seen by Fermi in a region near the Galactic Centre, ...
    • Dark matter and fundamental physics with the Cherenkov Telescope Array 

      Doro, M.; Conrad, J.; Emmanoulopoulos, D.; Sànchez-Conde, M.A.; Barrio, J.A.; Birsin, E.; Bolmont, J.; Brun, P.; Colafrancesco, S.; Connell, S.H.; Contreras, J.L.; Daniel, M.K.; Fornasa, M.; Gaug, M.; Glicenstein, J.F.; González-Muñoz, A.; Hassan, T.; Horns, D.; Jacholkowska, A.; Jahn, C.; Mazini, R.; Mirabal, N.; Moralejo, A.; Moulin, E.; Nieto, D.; Ripken, J.; Sandaker, H.; Schwanke, U.; Spengler, G.; Stamerra, A.; Viana, A.; Zechlin, H.-S.; Zimmer, S. (Elsevier, 2012-08-25)
      The Cherenkov Telescope Array (CTA) is a project for a next-generation observatory for very high energy (GeV–TeV) ground-based gamma-ray astronomy, currently in its design phase, and foreseen to be operative a few years ...
    • Dark matter versus pulsars: catching the impostor 

      Mirabal, N. (Oxford Academic, 2013-10-08)
      Evidence of excess GeV emission nearly coinciding with the Galactic Centre has been interpreted as a possible signature of annihilating dark matter. In this paper, we argue that it seems too early to discard pulsars as a ...
    • DATA YIELD OF THE ILRS GLOBAL NETWORK OVER THE PAST DECADE 

      Pavlis, E. C. (NASA, 2004-06)
      We present an analysis of the data yield history of the ILRS Global Network. Variations due to seasonal, weekly and anthropogenic effects will be evaluated and quantified. The data from only the two LAGEOS satellites are ...
    • Decadal changes in summertime reactive oxidized nitrogen and surface ozone over the Southeast United States 

      Li, Jingyi; Mao, Jingqiu; Fiore, Arlene M.; Cohen, Ronald C.; Crounse, John D.; Teng, Alex P.; Wennberg, Paul O.; Lee, Ben H.; Lopez-Hilfiker, Felipe D.; Thornton, Joel A.; Peischl, Jeff; Pollack, Ilana B.; Ryerson, Thomas B.; Veres, Patrick; Roberts, James M.; Neuman, J. Andrew; Nowak, John B.; Wolfe, Glenn M.; Hanisco, Thomas F.; Fried, Alan; Singh, Hanwant B.; Dibb, Jack; Paulot, Fabien; Horowitz, Larry W. (Copernicus Publications, 2018-02-16)
      Widespread efforts to abate ozone (O₃) smog have significantly reduced emissions of nitrogen oxides (NOx) over the past 2 decades in the Southeast US, a place heavily influenced by both anthropogenic and biogenic emissions. ...
    • A Decade of Gamma-Ray Bursts Observed by Fermi-LAT: The Second GRB Catalog 

      Ajello, M.; Arimoto, M.; Axelsson, M.; Baldini, L.; Barbiellini, G.; Bastieri, D.; Bellazzini, R.; Bhat, P. N.; Bissaldi, E.; Blandford, R. D.; Bonino, R.; Bonnell, J.; Bottacini, E.; Bregeon, J.; Bruel, P.; Buehler, R.; Cameron, R. A.; Caputo, R.; Caraveo, P. A.; Cavazzuti, E.; Chen, S.; Cheung, C. C.; Chiaro, G.; Ciprini, S.; Costantin, D.; Crnogorcevic, M.; Cutini, S.; Dainotti, M.; D’Ammando, F.; Luque, P. de la Torre; Palma, F. de; Desai, A.; Desiante, R.; Lalla, N. Di; Venere, L. Di; Dirirsa, F. Fana; Fegan, S. J.; Franckowiak, A.; Fukazawa, Y.; Funk, S.; Fusco, P.; Gargano, F.; Gasparrini, D.; Giglietto, N.; Giordano, F.; Giroletti, M.; Green, D.; Grenier, I. A.; Grove, J. E.; Guiriec, S.; Hays, E.; Hewitt, J. W.; Horan, D.; Jóhannesson, G.; Kocevski, D.; Kuss, M.; Latronico, L.; Li, J.; Longo, F.; Loparco, F.; Lovellette, M. N.; Lubrano, P.; Maldera, S.; Manfreda, A.; Martí-Devesa, G.; Mazziotta, M. N.; Mereu, I.; Meyer, M.; Michelson, P. F.; Mirabal, N.; Mitthumsiri, W.; Mizuno, T.; Monzani, M. E.; Moretti, E.; Morselli, A.; Moskalenko, I. V.; Negro, M.; Nuss, E.; Ohno, M.; Omodei, N.; Orienti, M.; Orlando, E.; Palatiello, M.; Paliya, V. S.; Paneque, D.; Persic, M.; Pesce-Rollins, M.; Petrosian, V.; Piron, F.; Poolakkil, S.; Poon, H.; Porter, T. A.; Principe, G.; Racusin, J. L.; Rainò, S.; Rando, R.; Razzano, M.; Razzaque, S.; Reimer, A.; Reimer, O.; Reposeur, T.; Ryde, F.; Serini, D.; Sgrò, C.; Siskind, E. J.; Sonbas, E.; Spandre, G.; Spinelli, P.; Suson, D. J.; Tajima, H.; Takahashi, M.; Tak, D.; Thayer, J. B.; Torres, D. F.; Troja, E.; Valverde, J.; Veres, P.; Vianello, G.; Kienlin, A. von; Wood, K.; Yassine, M.; Zhu, S.; Zimmer, S. (The American Astronomical Society, 2019-06-10)
      The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission from gamma-ray bursts (GRBs). Here we present the second catalog of LAT-detected GRBs, covering the first 10 yr of operations, ...
    • Demonstration of entanglement assisted invariance on IBM’s quantum experience 

      Deffner, Sebastian (Cell Press, 2017-11-03)
      Quantum entanglement is among the most fundamental, yet from classical intuition also most surprising properties of the fully quantum nature of physical reality. We report several experiments performed on IBM's Quantum ...
    • Demonstration of feed-forward control for linear optics quantum computation 

      Pittman, T.B.; Jacobs, B. C.; Franson, J.D. (American Physical Society (APS), 2002-11-14)
      One of the main requirements in linear optics quantum computing is the ability to perform single-qubit operations that are controlled by classical information fed forward from the output of single-photon detectors. These ...
    • Demonstration of Fine-Pitch High-Resolution X-ray Transition-Edge Sensor Microcalorimeters Optimized for Energies below 1 keV 

      Sakai, K.; Adams, J. S.; Bandler, S. R.; Beaumont, S.; Chervenak, J. A.; Datesman, A. M.; Finkbeiner, F. M.; Kelley, R. L.; Kilbourne, C. A.; Miniussi, A. R.; Porter, F. S.; Sadleir, J. E.; Smith, S. J.; Wakeham, N. A.; Wassell, E. J.; Jaeckel, F. T.; McCammon, D.; Eckart, M. E.; Ryu, K. (Springer Nature Switzerland AG., 2020-03-07)
      In this paper, we report on X-ray transition-edge sensor (TES) microcalorimeters optimized to have the best possible energy resolution for a limited energy range for the incoming X-rays, such as an energy resolution of 0.3 ...
    • Demonstration of Nondeterministic Quantum Logic Operations Using Linear Optical Elements 

      Pittman, T. P.; Jacobs, B. C.; Franson, J.D. (American Physical Society (APS), 2002-06-06)
      Knill, Laflamme, and Milburn [Nature (London) 409, 46 (2001)] recently showed that nondeterministic quantum logic operations could be performed using linear optical elements, additional photons (ancilla), and postselection ...
    • Demonstration of quantum error correction using linear optics 

      Pittman, T.B.; Jacobs, B. C.; Franson, J.D. (American Physical Society (APS), 2005-05-31)
      We describe a laboratory demonstration of a quantum error correction procedure that can correct intrinsic measurement errors in linear-optics quantum gates. The procedure involves a two-qubit encoding and fast feed-forwa ...
    • Design concepts for the Cherenkov Telescope Array CTA: an advanced facility for ground-based high-energy gamma-ray astronomy 

      Mirabal, N.; et al. (Springer Nature, 2011-11-23)
      Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. Ground-based gamma-ray astronomy has a huge potential in ...
    • Designing the Next Generation Global Geodetic Networks to support GGOS 

      Pavlis, Erricos C.; Ries, J. C.; MacMillan, D. S.; Kuzmicz-Cieslak, M.; Ma, C.; Rowlands, D. D. (International Association of Geodesy, 2007-11-05)
    • The Detailed Optical Light Curve of GRB 030329 

      Lipkin, Y. M.; Ofek, E. O.; Gal-Yam, A.; Leibowitz, E. M.; Poznanski, D.; Kaspi, S.; Polishook, D.; Kulkarni, S. R.; Fox, D. W.; Berger, E.; Mirabal, N.; Halpern, J.; Bureau, M.; Fathi, K.; Price, P. A.; Peterson, B. A.; Frebel, A.; Schmidt, B.; Orosz, J. A.; Fitzgerald, J. B.; Bloom, J. S.; Dokkum, P. G. van; Bailyn, C. D.; Buxton, M. M.; Barsony, M. (IOP, 2004-01-19)
      We present densely sampled BVRI light curves of the optical transient associated with the gamma-ray burst (GRB) 030329, the result of a coordinated observing campaign conducted at five observatories. Augmented with published ...
    • Detection of a Gamma-Ray Flare from the High-redshift Blazar DA 193 

      Paliya, Vaidehi S.; Ajello, M.; Ojha, R.; Angioni, R.; Cheung, C. C.; Tanada, K.; Pursimo, T.; Galindo, P.; Losada, I. R.; Siltala, L.; Djupvik, A. A.; Marcotulli, L.; Hartmann, D. (IOP, 2019-02-01)
      High-redshift (z > 2) blazars are the most powerful members of the blazar family. Yet, only a handful of them have both X-ray and γ-ray detection, thereby making it difficult to characterize the energetics of the most ...
    • Detection of an Optical/UV Jet/Counterjet and Multiple Spectral Components in M84 

      Meyer, Eileen T.; Petropoulou, Maria; Georganopoulos, Markos; Chiaberge, Marco; Breiding, Peter; Sparks, William B. (IOP, 2018-06-06)
      We report an optical/UV jet and counterjet in M84, previously unreported in archival Hubble Space Telescope imaging. With archival VLA, ALMA, and Chandra imaging, we examine the first well-sampled spectral energy distribution ...
    • Detection of Superluminal Motion in the X-Ray Jet of M87 

      Snios, Bradford; Nulsen, Paul. E. J.; Kraft, Ralph P.; Cheung, C. C.; Meyer, Eileen T.; Forman, William R.; Jones, Christine; Murray, Stephen S. (The American Astronomical Society, 2019-06-26)
      Chandra HRC observations are investigated for evidence of proper motion and brightness changes in the X-ray jet of the nearby radio galaxy M87. Using images spanning 5 yr, proper motion is measured in the X-ray knot ...
    • Detection of the blazar S4 0954+65 at very-high-energy with the MAGIC telescopes during an exceptionally high optical state 

      González, J. Becerra; Ojha, R. (EDP sciences, 2018-09-13)
      Aims. The very high energy (VHE ≳100 GeV) γ-ray MAGIC observations of the blazar S4 0954+65, were triggered by an exceptionally high flux state of emission in the optical. This blazar has a disputed redshift of z = 0.368 ...
    • Development of a parametric down-conversion source for two-photon absorption experiments 

      Pittman, T.B. (SPIE, 2007-09-25)
      We describe a fiber-coupled parametric down-conversion (PDC) source designed for entanglement-enhanced twophoton absorption experiments. The key feature of the source is a narrowband (~1 MHz) UV diode pumping laser which ...