Browsing FAS Scholarly Articles by Title

Now showing items 11586-11605 of 18292

    • Optical Spectra of Type 1a Supernovae at z = 0.46 and z = 1.2 

      Coil, Alison L.; Matheson, Thomas; Filippenko, Alexei V.; Leonard, Douglas C.; Tonry, John; Riess, Adam G.; Challis, Peter; Clocchiatti, Alejandro; Garnavich, Peter M.; Hogan, Craig J.; Jha, Saurabh; Kirshner, Robert P.; Leibundgut, B.; Phillips, M. M.; Schmidt, Brian P.; Schommer, Robert A.; Smith, R. Chris; Soderberg, Alicia M.; Spyromilio, J.; Stubbs, Christopher; Suntzeff, Nicholas B.; Woudt, Patrick (American Astronomical Society, 2000)
      We present optical spectra, obtained with the Keck 10 m telescope, of two high-redshift Type Ia supernovae (SNe Ia) discovered by the High-z Supernova Search Team: SN 1999ff at z = 0.455 and SN 1999fv at z similar to 1.2, ...

    • Optical spectroscopic observations of gamma-ray blazars candidates I: preliminary results 

      Paggi, A.; Milisavljevic, Danny; Masetti, N.; Jiménez-Bailón, E.; Chavushyan, V.; Massaro, F.; Giroletti, M.; Smith, Howard A.; Margutti, R.; Tosti, G.; Martínez-Galarza, J. R.; Otí-Floranes, H.; Landoni, M.; Grindlay, Jonathan E.; Funk, S. (IOP Publishing, 2014)
      A significant fraction (~30%) of the γ-ray sources listed in the second Fermi/LAT (2FGL) catalog is still of unknown origin, being not yet associated with counterparts at lower energies. Using the available information at ...

    • Optical Spectroscopy of Type Ia Supernovae 

      Matheson, T.; Kirshner, Robert P.; Challis, Peter M.; Jha, S.; Garnavich, P. M.; Berlind, Perry; Calkins, Michael Lee; Blondin, S.; Balog, Z.; Bragg, A. E.; Caldwell, Nelson; Concannon, K. Dendy; Falco, E. E.; Graves, G. J. M.; Huchra, J. P.; Kuraszkiewicz, Joanna; Mader, J. A.; Mahdavi, A.; Phelps, Matthew William; Rines, K.; Song, I.; Wilkes, Belinda Jane (IOP Publishing, 2008)
      We present 432 low-dispersion optical spectra of 32 Type Ia supernovae (SNe Ia) that also have well-calibrated light curves. The coverage ranges from 6 epochs to 36 epochs of spectroscopy. Most of the data were obtained ...

    • Optical Splitting Trees for High-Precision Monocular Imaging 

      McGuire, Morgan; Matusik, Wojciech; Pfister, Hanspeter; Chen, Billy; Hughes, John F.; Nayar, Shree K. (Institute of Electrical and Electronics Engineers, 2007)
      This paper introduces a framework to design optical splitting tree to perform computational photography tasks that require many sensors with a common optical axis. As the number of sensors increases, designing a good optical ...

    • Optical Superradiance from Nuclear Spin Environment of Single-Photon Emitters 

      Kessler, Eric; Yelin, Susanne; Lukin, Mikhail D.; Cirac, J. I.; Giedke, G. (American Physical Society (APS), 2010)
      We show that superradiant optical emission can be observed from the polarized nuclear spin ensemble surrounding a single-photon emitter such as a single quantum dot or nitrogen-vacancy center. The superradiant light is ...

    • Optically Controlled Oscillators in an Engineered Bioelectric Tissue 

      McNamara, Harold Michael; Zhang, Hongkang; Werley, Christopher; Cohen, Adam Ezra (American Physical Society (APS), 2016)
      Complex electrical dynamics in excitable tissues occur throughout biology, but the roles of individual ion channels can be difficult to determine due to the complex nonlinear interactions in native tissue. Here, we ask ...

    • Optically pumped 1.3  μm room-temperature InAs quantum-dot micro-disk lasers directly grown on (001) silicon 

      Wan, Yating; Li, Qiang; Liu, Alan Y.; Gossard, Arthur C.; Bowers, John E.; Hu, Evelyn; Lau, Kei May (The Optical Society, 2016)
      Direct integration of high-performance laser diodes on silicon will dramatically transform the world of photonics, expediting the progress toward low-cost and compact photonic integrated circuits (PICs) on the mainstream ...

    • Optically pumped nanowire lasers: invited review 

      Zimmler, Mariano A; Capasso, Federico; Müller, Sven; Ronning, Carsten (IOP Publishing, 2010)
      This paper reviews several topics related to optically pumped ZnO nanowire lasers. A systematic study of the various properties of a device as it evolves from the regime of amplified spontaneous emission to laser oscillation ...

    • Optical–infrared flares and radio afterglows by Jovian planets inspiraling into their host stars 

      Yamazaki, Ryo; Hayasaki, Kimitake; Loeb, Abraham (Oxford University Press (OUP), 2016)
      When a planet inspirals into its host star, it releases gravitational energy which is converted into an expanding bubble of hot plasma. We study the radiation from the bubble and show that it includes prompt optical-infrared ...

    • An Optimal Algorithm for the Distinct Elements Problem 

      Kane, Daniel M.; Nelson, Jelani; Woodruff, David P. (ACM, 2010)
      We give the first optimal algorithm for estimating the number of distinct elements in a data stream, closing a long line of theoretical research on this problem begun by Flajolet and Martin in their seminal paper in FOCS ...

    • Optimal approach to quantum communication using dynamic programming 

      Jiang, Liang; Taylor, Jacob; Khaneja, Navin; Lukin, Mikhail (National Academy of Sciences, 2007)
      Reliable preparation of entanglement between distant systems is an outstanding problem in quantum information science and quantum communication. In practice, this has to be accomplished by noisy channels (such as optical ...

    • Optimal Approximate Matrix Product in Terms of Stable Rank 

      Cohen, Michael B.; Nelson, Jelani; Woodruff, David P. (2015)
      We prove, using the subspace embedding guarantee in a black box way, that one can achieve the spectral norm guarantee for approximate matrix multiplication with a dimensionality-reducing map having m=O(r̃ /ε2) rows. Here ...

    • Optimal Approximations by Piecewise Smooth Functions and Associated Variational Problems 

      Mumford, David Bryant; Shah, Jayant (Wiley-Blackwell, 1989)

    • Optimal architectures for long distance quantum communication 

      Muralidharan, Sreraman; Li, Linshu; Kim, Jungsang; Lütkenhaus, Norbert; Lukin, Mikhail D.; Jiang, Liang (Nature Publishing Group, 2016)
      Despite the tremendous progress of quantum cryptography, efficient quantum communication over long distances (≥1000 km) remains an outstanding challenge due to fiber attenuation and operation errors accumulated over the ...

    • Optimal Auction Design for Agents with Hard Valuation Problems 

      Parkes, David C. (Springer-Verlag, 2000)
      As traditional commerce moves on-line more business transactions will be mediated by software agents, and the ability of agent-mediated electronic marketplaces to efficiently allocate resources will be highly dependent on ...

    • Optimal Capital Accumulation and Corporate Investment Behavior 

      Jorgenson, Dale W.; Siebert, Calvin D. (University of Chicago Press, 1968)
      No abstract provided.

    • Optimal Capital Versus Labor Taxation with Innovation-Led Growth 

      Aghion, Philippe; Akcigit, Ufuk; Fernández-Villaverde, Jesús (National Bureau of Economic Research Inc, 2012)
      Chamley (1986) and Judd (1985) showed that, in a standard neoclassical growth model with capital accumulation and infinitely lived agents, either taxing or subsidizing capital cannot be optimal in the steady state. In this ...

    • Optimal Capital-Gains Taxation Under Limited Information 

      Green, Jerry; Sheshinski, Eytan (University of Chicago Press, 1978)
      Taxation of capital gains at realization may distort individuals' decisions regarding holding or selling during an asset's lifetime. This creates the problem of designing a tax structure for capital gains so as to induce ...

    • Optimal Constants in the Rosenthal Inequality for Random Variables with Zero Odd Moments. 

      Ibragimov, Rustam; Ibragimov, Marat (Elsevier Science B.V., Amsterdam, 2008)
      We obtain estimates for the best constant in the Rosenthal inequality View the MathML source for independent random variables ξ1,…,ξn with l zero first odd moments, lgreater-or-equal, slanted1. The estimates are sharp in ...

    • Optimal Control of Light Pulse Storage and Retrieval 

      Novikova, Irina; Gorshkov, Alexey V.; Phillips, David F.; Sørensen, Anders S.; Lukin, Mikhail D.; Walsworth, Ronald L. (American Physical Society, 2007)
      We demonstrate experimentally a procedure to obtain the maximum efficiency for the storage and retrieval of light pulses in atomic media. The procedure uses time-reversal to obtain optimal input signal pulse shapes. ...