Now showing items 56-75 of 845

    • Bell's Inequality Tests and Quantum Communication with Entangled Photon Holes 

      Pittman, T.B.; Franson, J.D. (OSA Publishing, 2007-06)
      We report on experimental work towards the realization of quantum communication with entangled photon holes. These experiments involve two-photon interferometry and photon hole states generated through quantum interference ...
    • Benchmarking parallel implementations of cloud type clustering from satellite data 

      Barajas, Carlos A.; Mukherjee, Lipi; Guo, Pei; Hoban, Susan; Jin, Daeho; Gangopadhyay, Aryya; Wang, Jianwu
      The study of clouds, i.e., where they occur and what are their characteristics, plays a key role in the understanding of climate change. The aim of this project is to use machine learning in conjunction with parallel ...
    • Benchmarking Parallel K-Means Cloud Type Clustering from Satellite Data 

      Barajas, Carlos; Guo, Pei; Mukherjee, Lipi; Hoban, Susan; Wang, Jianwu; Jin, Daeho; Gangopadhyay, Aryya; Gobbert, Matthias K. (Springer, Cham, 2019-10-08)
      The study of clouds, i.e., where they occur and what are their characteristics, plays a key role in the understanding of climate change. Clustering is a common machine learning technique used in atmospheric science to ...
    • Blazar Sheath Illumination of the Outer Molecular Torus: A Resolution of the Seed Photon Problem for the Far-GeV Blazar Flares 

      Breiding, Peter; Georganopoulos, Markos; Meyer, Eileen T. (IOP, 2018-01-18)
      Recent multiwavelength work led by the Boston University blazar group (e.g., Marscher et al.) strongly suggests that a fraction of the blazar flares seen by the Fermi Large Area Telescope (LAT) take place a few to several ...
    • Bosons Outperform Fermions – The Thermodynamic Advantage of Symmetry 

      Myers, Nathan M.; Deffner, Sebastian (2019-10-11)
      We examine a quantum Otto engine with a harmonic working medium consisting of two particles to explore the use of wave function symmetry as an accessible resource. It is shown that the bosonic system displays enhanced ...
    • Breaking the Blazar Sequence: A New View of Radio Loud AGN Unification 

      Meyer, Eileen T.; Fossati, Giovanni; Georganopoulos, Markos; Lister, Matthew L. (2012-05-03)
      In recent work, we have identified two sub-populations of radio-loud AGN which appear to be distinguished by jet structure, where low-efficiency accreting systems produce `weak' jets which decelerate more rapidly than the ...
    • BrO and inferred Bry profiles over the western Pacific: relevance of inorganic bromine sources and a Bry minimum in the aged tropical tropopause layer 

      Koenig, Theodore K.; Volkamer, Rainer; Baidar, Sunil; Dix, Barbara; Wang, Siyuan; Anderson, Daniel C.; Salawitch, Ross J.; Wales, Pamela A.; Cuevas, Carlos A.; Fernandez, Rafael P.; Saiz‐Lopez, Alfonso; Evans, Matthew J.; Sherwen, Tomás; Jacob, Daniel J.; Schmidt, Johan; Kinnison, Douglas; Lamarque, Jean-François; Apel, Eric C.; Bresch, James C.; Campos, Teresa; Flocke, Frank M.; Hall, Samuel R.; Honomichl, Shawn B.; Hornbrook, Rebecca; Jensen, Jørgen B.; Lueb, Richard; Montzka, Denise D.; Pan, Laura L.; Reeves, J. Michael; Schauffler, Sue M.; Ullmann, Kirk; Weinheimer, Andrew J.; Atlas, Elliot L.; Donets, Valeria; Navarro, Maria A.; Riemer, Daniel; Blake, Nicola J.; Chen, Dexian; Huey, L. Gregory; Tanner, David J.; Hanisco, Thomas F.; Wolfe, Glenn M. (Copernicus Publications, 2017-12-22)
      We report measurements of bromine monoxide (BrO) and use an observationally constrained chemical box model to infer total gas-phase inorganic bromine (Bry) over the tropical western Pacific Ocean (tWPO) during the CONTRAST ...
    • A broad-band X-ray spectral study of the Seyfert 1 galaxy ESO 141–G055 with XMM–Newton and NuSTAR 

      Ghosh, Ritesh; Laha, Sibasish (Oxford Academic, 2020-08-06)
      We have extensively studied the broad--band X-ray spectra of the source ESO 141–G055 using all available XMM–Newton and NuSTAR observations. We detect a prominent soft excess below 2keV⁠, a narrow Fe line, and a Compton ...
    • C-phase gates in SiMOS and Si/SiGe double quantum dots 

      Güngördü, Utkan; Kestner, J. P.
      We theoretically analyze the errors in one- and two-qubit gates in SiMOS and Si/SiGe spin qubit experiments, and present a pulse sequence which can suppress the errors in exchange coupling due to charge noise using ideal ...
    • Calorimetric neutrino expectations from bright blazar flares 

      Kreter, Michael; Kadler, Matthias; Krauß, Felicia; Buson, Sara; Ojha, Roopesh; Mannheim, Karl; Wilms, Jörn; Böttcher, Markus; Fermi/LAT Collaboration (Proceedings of Science, 2019-07-24)
      Blazar jets are extreme environments, in which relativistic proton interactions with an ultraviolet photon field could give rise to photopion production. High-confidence associations of individual high-energy neutrinos ...
    • Can a simple instrument measure polarization in gamma-ray bursts? 

      Curioni, A.; Mirabal, N. (2004-02-25)
      The recent claim of a high degree of linear polarization in the prompt gamma-ray burst (GRB) emission of GRB 021206 might have important implications for the underlying mechanism ultimately responsible for the GRB radiation. ...
    • Can Two-Photon Interference be Considered the Interference of Two Photons? 

      Pittman, T. B.; Strekalov, D. V.; Migdall, A.; Rubin, M. H.; Sergienko, A. V.; Shih, Y. H. (American Physical Society (APS), 1996-09-02)
      We report on a “postponed compensation” experiment in which the observed two-photon entangled state interference cannot be pictured in terms of the overlap of the two individual photon wave packets of a parametric ...
    • Carrier Dynamics, Optical Gain, and Lasing with Colloidal Quantum Wells 

      Yang, Zhili; Pelton, Matthew; Fedin, Igor; Talapin, Dmitri V.; Waks, Edo (ACS Publicaions, 2018)
      The most recent class of semiconductor nanocrystal to be synthesized colloidally is the quantum well, in which carriers are confined quantum mechanically in only one dimension. Electrons and holes in colloidal quantum wells ...
    • Causality Analysis of ENSO’s Global Impacts on Climate Variables based on Data-driven Analytics and Climate Model Simulation 

      Song, Hua; Tian, Jing; Huang, Jingfeng; Wang, Jianwu; Zhang, Zhibo
      Numerous studies have indicated that El Niño and the Southern Oscillation (ENSO) could have determinant impacts on remote weather and climate using the conventional correlation-based methods, which however cannot identify ...
    • A Cavity-Enhanced UV Absorption Instrument for High Precision, Fast Time Response Ozone Measurements 

      Hannun, Reem A.; Swanson, Andrew K.; Bailey, Steven A.; Hanisco, Thomas F.; Bui, T. Paul; Bourgeois, Ilann; Peischl, Jeff; Ryerson, Thomas B. (EGU Publications, 2020-07-22)
      The NASA Rapid Ozone Experiment (ROZE) is a broadband cavity-enhanced UV absorption instrument for the detection of in situ ozone (O₃). ROZE uses an incoherent LED light source coupled to a high-finesse optical cavity to ...
    • Chandra Observation of Luminous and Ultraluminous X-ray Binaries in MIOI 

      Mukai, K.; Pence, W. D.; Snowden, S. L.; Kuntz, K. D.
      X-ray binaries in the Milky Way axe among the brightest objects on the Xray sky. With the increasing sensitivity of recent missions, it is now possible to study X-ray binaries in nearby galaxies. We present data on six ...
    • Characteristics of DSD Bulk Parameters: Implication for Radar Rain Retrieval 

      Liao, Liang; Meneghini, Robert; Iguchi, Toshio; Tokay, Ali (MDPI, 2020-06-25)
      With the use of 213,456 one-minute measured data of droplet-size distribution (DSD) of rain collected during several National Aeronautics and Space Administration (NASA)-sponsored field campaigns, the relationships between ...
    • Characterization of Aerosol Type Over East Asia by 4.4 km MISR Product: First Insight and General Performance 

      Tao, Minghui; Wang, Jun; Li, Rong; Chen, Liangfu; Xu, Xiaoguang; Wang, Lunche; Tao, Jinhua; Wang, Zifeng; Xiang, Juan (American Geophysical Union, 2020-06-01)
      The lack of aerosol type information has largely hindered satellite products from further applications such as constraining model simulations and quantifying aerosol climate effects. The recent Version (V) 23 Multi‐angle ...
    • Characterization of long baseline calibrators at 2.3 GHz 

      Hungwe, F.; Ojha, R.; Booth, R. S.; Bietenholz, M. F.; Collioud, A.; Charlot, P.; Boboltz, D.; Fey, A. L. (Oxford University Press, 2011-12-08)
      We present a detailed multi-epoch analysis of 31 potential Southern hemisphere radio calibrators that were originally observed as part of a programme to maintain the International Celestial Reference Frame. At radio ...
    • Characterizing the population of pulsars in the inner Galaxy with the Fermi Large Area Telescope 

      MIRABAL, N.; et al. (2017-04-28)
      An excess of γ-ray emission from the Galactic Center (GC) region with respect to predictions based on a variety of interstellar emission models and γ-ray source catalogs has been found by many groups using data from the ...