Now showing items 383-402 of 841

    • K2 Ultracool Dwarfs Survey – VI. White light superflares observed on an L5 dwarf and flare rates of L dwarfs 

      Paudel, R. R.; Gizis, J. E.; Mullan, D. J.; Schmidt, S. J.; Burgasser, A. J.; Williams, P. K. G. (Oxford University Press, 2020-05-06)
      KeplerK2 long cadence data are used to study white light flares in a sample of 45 L dwarfs. We identified 11 flares on 9 L dwarfs with equivalent durations of (1.3–198) h and total (UV/optical/IR) energies of ≥0.9 × 10³² ...
    • kCARTA : A fast pseudo line-by-line radiative transfer algorithm with analytic Jacobians, fluxes, Non-Local Thermodynamic Equilibrium and scattering for the infrared 

      Machado, Sergio DeSouza; Strow, L. Larrabee; Motteler, Howard; Hannon, Scott (EGU, 2019-08-09)
      A fast pseudo-monochromatic radiative transfer package using a Singular Value Decomposition (SVD) compressed atmospheric optical depth database has been developed, primarily for use with hyperspectral sounding instruments. ...
    • Kibble-Zurek scaling in quantum speed limits for shortcuts to adiabaticity 

      Puebla, Ricardo; Deffner, Sebastian; Campbell, Steve (2020-06-08)
      Geometric quantum speed limits quantify the trade-off between the rate with which quantum states can change and the resources that are expended during the evolution. Counterdiabatic driving is a unique tool from shortcuts ...
    • Kibble-Zurek scaling of the irreversible entropy production 

      Deffner, Sebastian (American Physical Society (APS), 2017-11-16)
      If a system is driven at finite rate through a phase transition by varying an intensive parameter, the order parameter shatters into finite domains. The Kibble-Zurek mechanism predicts the typical size of these domains, ...
    • A Kiloparsec-scale Internal Shock Collision in the Jet of a Nearby Radio Galaxy 

      Meyer, Eileen T.; Georganopoulos, Markos; Sparks, William B.; Perlman, Eric; Marel, Roeland P. van der; Anderson, Jay; Sohn, Sangmo Tony; Biretta, John; Norman, Colin; Chiaberge, Marco (Nature Research, 2015-05-27)
      Jets of highly energized plasma with relativistic velocities are associated with black holes ranging in mass from a few times that of the Sun to the billion-solar-mass black holes at the centres of galaxies. A popular but ...
    • Kiloparsec-scale Jets: Physics, Emission Mechanisms, and Challenges 

      Perlman, Eric S.; Meyer, Eileen; Eilek, Jean; Tchekhovskoy, Sasha; Nyland, Kristina; Agudo, Ivan; Baum, Stefi; Hardcastle, Martin; Kadler, Matthias; Labiano, Alvaro; Marshall, Herman; O’Dea, Christopher; Worrall, Diana (2019-03-08)
      Jets are a ubiquitous part of the accretion process, created in AGN, by a coupling between the magnetic field near the central black hole and inflowing material. We point out what advances can be achieved by new technologies, ...
    • The Knotty Question of the Jet of PKS B1421–490 

      Gelbord, J. M.; Marshall, H. L.; Worrall, D. M.; Birkinshaw, M.; Lovell, J. E. J.; Ojha, R.; Godfrey, L.; Schwartz, D. A.; Perlman, E. S.; Georganopoulos, M.; Murphy, D. W.; Jauncey, D. L. (IOP, 2005-10-04)
      We report the discovery of unusually strong optical and X-ray emission associated with a knot in the radio jet of PKS B1421-490. The knot is the brightest feature observed beyond the radio band, with knot/core flux ratios ...
    • Ladder-type electromagnetically induced transparency using nanofiber-guided light in a warm atomic vapor 

      Jones, D.E; Franson, J.D.; Pittman, T.B. (American Physical Society (APS), 2015-10-05)
      We demonstrate ladder-type electromagnetically induced transparency (EIT) using an optical nanofiber suspended in a warm rubidium vapor. The signal and control fields are both guided along the nanofiber, which enables ...
    • LARES (LAser RElativity Satellite): Status Report 

      Boni, A.; Cantone, C.; Dell’Agnello, S.; Delle Monache, G. O.; Franceschi, M. A.; Garattini, M.; Intaglietta, N.; Lops, C.; Martini, M.; Maiello, M.; Prosperi, C.; Bellettini, G.; Tauraso, R.; March, R.; Ciufolini, I.; Berardi, S.; Cerruti, C.; Graziani, F.; Ialongo, P.; Lucantoni, A.; Paolozzi, A.; Peroni, I.; Paris, C.; Sindoni, G.; Vendittozzi, C.; Currie, D. G.; Arnold, D.; Rubincam, D. P.; Pavlis, E. C.; Matzner, R.; Slabinski, V. J. (Instituto Nazionale di Fisica Nucleare, 2008-05-21)
    • LARES mission operations 

      Sindoni, Giampiero; Pavlis, Erricos C. (IEEE, 2015-03-07)
      LAser RElativity Satellite (LARES) is an Italian Space Agency mission that started operations on February 2012 after a successful launch on ESA's VEGA qualification flight. The satellite is covered with retroreflectors ...
    • LARES Satellite Thermal Forces and a Test of General Relativity 

      Matzner, Richard; Nguyen, Phuc; Brooks, Jason; Ciufolini, Ignazio; Antonio, Paolozzi; Pavlis, Erricos C.; Koenig, Rolf; Ries, John; Gurzadyan, Vahe; Penrose, Roger; Sindoni, Giampiero; Paris, Claudia; Khachatryan, Harutyun; Mirzoyan, Sergey (IEEE, 2016-09-22)
      We summarize a laser-ranged satellite test of frame dragging, a prediction of General Relativity, and then concentrate on the estimate of thermal thrust, an important perturbation affecting the accuracy of the test. The ...
    • LARES: A NEW ASI MISSION TO IMPROVE THE MEASUREMENT OF LENSE-THIRRING EFFECT WITH SATELLITE LASER RANGING 

      Pavlis, E.C.; Ciufolini, I.; Paolozzi, A.
      LARES, Laser Relativity Satellite, is a spherical laser-ranged satellite, passive and covered with retroreflectors. It will be launched with ESA’s new launch vehicle VEGA (ESA-ELV-ASI-AVIO) in early 2012. Its orbital ...
    • A large atomic chlorine source inferred from mid-continental reactive nitrogen chemistry 

      Thornton, Joel A.; Kercher, James P.; Riedel, Theran P.; Wagner, Nicholas L.; Cozic, Julie; Holloway, John S.; Dubé, William P.; Wolfe, Glenn M.; Quinn, Patricia K.; Middlebrook, Ann M.; Alexander, Becky; Brown, Steven S. (Nature Research, 2010-03-11)
      Halogen atoms and oxides are highly reactive and can profoundly affect atmospheric composition. Chlorine atoms can decrease the lifetimes of gaseous elemental mercury1 and hydrocarbons such as the greenhouse gas methane2. ...
    • Large Third-Order Nonlinearities in Atomic Layer Deposition Grown Nitrogen-Enriched TiO₂ Nanoscale Films 

      Kuis, Robinson; Gougousi, Theodosia; Basaldua, Isaac; Burkins, Paul; Kropp, Jaron A.; Johnson, Anthony M. (IEEE, 2020-08)
      Nonlinear refractive index, n₂, values as high as 1±.1x10⁻⁹ cm² /W were measured in atomic layer deposition (ALD) grown TiO₂ nanoscale films, using femtosecond thermally managed Z-scan. The several order of magnitude ...
    • Large-scale H I in nearby radio galaxies – II. The nature of classical low-power radio sources 

      Emonts, B. H. C.; Morganti, R.; Struve, C.; Oosterloo, T. A.; Moorsel, G. van; Tadhunter, C. N.; Hulst, J. M. van der; Brogt, E.; Holt, J.; Mirabal, N. (Oxford University Press, 2010-07-19)
      An important aspect of solving the long-standing question as to what triggers various types of active galactic nuclei (AGN) involves a thorough understanding of the overall properties and formation history of their host ...
    • LIDAR PROFILING IN THE LOWER TROPOSPHERE: EXPERIENCE FROM PECAN 

      Demoz, Belay; Delgado, Ruben; Caroll, Brian; Vermeesch, Kevin; Whiteman, David N.; Sakia, Ricardo; Tesfay, Sium; Cooper, Lorenzo (EPJ, 2018)
      Results from the PECAN (Plains Elevated Convection at Night) campaign are discussed. In particular, the utility of simple backscatter lidars/ceilometers in quantifying atmospheric dynamics parameters and variables as well ...
    • Lifetime Discrimination Burden, Racial Discrimination, and Subclinical Cerebrovascular Disease among African Americans 

      Moody, Danielle L. Beatty; Taylor, Antione D.; Leibel, Daniel K.; Al-Najjar, Elias; Katzel, Leslie I.; Davatzikos, Christos; Gullapalli, Rao P.; Seliger, Stephen L.; Kouo, Theresa; Erus, Guray; Rosenberger, William F.; Evans, Michele K.; Zonderman, Zonderman; Waldstein, Shari R. (American Physiological Association, 2018-11-26)
      Explore interactive relations of lifetime discrimination burden and racial discrimination – chronic stressors among African Americans (AA) – and age with magnetic resonance imaging (MRI)-assessed white matter lesion volume ...
    • The lively accretion disk in NGC 2992. I. Transient iron K emission lines in the high flux state 

      Marinucci, A.; Bianchi, S.; Braito, V.; De Marco, B.; Matt, G.; Middei, R.; Nardini, E.; Reeves, J. N. (2020-06-09)
      We report on one of the brightest flux levels of the Seyfert 2 galaxy NGC 2992 ever observed in X-rays, on May 2019. The source has been monitored every few days from March 26, 2019 to December 14, 2019 by Swift-XRT, and ...
    • Local gradient optimization of leakage-suppressing entangling sequences 

      Setser, Arman A.; Kestner, Jason P. (2020-07-17)
      We use a gradient-based optimization scheme to find single-qubit rotations to be interwoven between timesteps of a noisy logical two-qubit entangling gate in order to suppress arbitrary logical and leakage errors in the ...
    • Local Group and Star Cluster Dynamics from HSTPROMO (The Hubble Space Telescope Proper Motion Collaboration) 

      Marel, Roeland P. van der; Anderson, Jay; Bellini, Andrea; Besla, Gurtina; Bianchini, Paolo; Boylan-Kolchin, Mike; Chaname, Julio; Deason, Alis; Do, Tuan; Guhathakurta, Puragra; Kallivayalil, Nitya; Lennon, Danny; Massari, Davide; Meyer, Eileen; Platais, Imants; Sabbi, Elena; Sohn, Sangmo Tony; Soto, Mario; Trenti, Michele; Watkins, Laura (2013-09-08)
      The Hubble Space Telescope (HST) has proven to be uniquely suited for the measurement of proper motions (PMs) of stars and galaxies in the nearby Universe. Here we summarize the main results and ongoing studies of the ...