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Now showing items 33-52 of 123

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    Dust Climatology of the NASA Dryden Flight Research Center (DFRC) in Lancaster, California, USA 

    Pokharel, Ashok K.; Kaplan, Michael L. (2017)
    A 15-year (1997-2011) climatology of dust events at the NASA DFRC in Lancaster, California, USA, was performed to evaluate how the extratropical systems were associated with dust storms over this region. For this study, ...
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    Dynamic induced softening in frictional granular materials investigated by discrete-element-method simulation 

    Lemrich, Laure; Carmeliet, Jan; Johnson, Paul A.; Guyer, Robert A.; Jia, Xiaoping (2017)
    A granular system composed of frictional glass beads is simulated using the discrete element method. The intergrain forces are based on the Hertz contact law in the normal direction with frictional tangential force. The ...
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    Dynamics and structure of self-generated magnetics fields on solids following high contrast, high intensity laser irradiation 

    Albertazzi, B.; Chen, S. N.; Antici, P.; Boeker, J.; Borghesi, M.; Breil, J.; Dervieux, V.; Feugeas, J. L.; Lancia, L.; Nakatsutsumi, M.; Nicolai, Ph; Romagnagni, L.; Shepherd, R.; Sentoku, Y.; Starodubtsev, M.; Swantusch, M.; Tikhonchuk, V. T.; Willi, O.; d'Humieres, E.; Pepin, H.; Fuchs, J. (2015)
    The dynamics of self-generated magnetic B-fields produced following the interaction of a high contrast, high intensity (I > 1019 W cm−2) laser beam with thin (3 μm thick) solid (Al or Au) targets is investigated experimentally ...
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    Effects of molecular resonances on Rydberg blockade 

    Derevianko, Andrei; Kómár, Péter; Topcu, Turker; Kroeze, Ronen M.; Lukin, Mikhail D. (2015)
    We study the effect of resonances associated with complex molecular interaction of Rydberg atoms on Rydberg blockade. We show that densely spaced molecular potentials between doubly excited atomic pairs become unavoidably ...
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    Efficient repumping of a Ca magneto-optical trap 

    Mills, Michael; Puri, Prateek; Yu, Yanmei; Derevianko, Andrei; Schneider, Christian; Hudson, Eric R. (2017)
    We investigate the limiting factors in the standard implementation of the Ca magneto-optical trap. We find that intercombination transitions from the 4s5p(1)P(1) state used to repump the electronic population from the 3d4s ...
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    Electron beam guiding by external magnetic fields in imploded fuel plasma 

    Johzaki, Tomoyuki; Sentoku, Y.; Nagatomo, Hideo; Sunahara, A.; Sakagami, H.; Fujioka, Shinsuke; Nagatomo, Hideo; Endo, T. (2016)
    For enhancing the core heating efficiency in fast ignition laser fusion, we proposed the fast electron beam by externally-applied the kilo-tesla (kT) class longitudinal magnetic field. We evaluated the imploded core and ...
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    Erratum: “Angular truncation errors in integrating nephelometry” [Rev. Sci. Instrum. 74, 3492 (2003)] 

    Moosmuller, Hans; Arnott, W. Patrick (2019)
    Correction of typographic errors
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    Evaluation of Near Real-Time Preliminary Tornado Damage Paths 

    Karstens, Christopher D.; Shourd, Kacie N.; Speheger, Doug; Anderson, Aaron; Smith, Richard; Andra, David; Smith, Travis M.; Lakshmanan, Valliappa; Erickson, Somer A. (2016)
    The ability to preliminarily diagnose areas damaged by a tornado is examined using both a manual and an automated approach. The manual method consists of using Weather Surveillance Radar-1988 Doppler base data to track ...
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    Evaluation of Surface Fluxes in the WRF Model: Case Study for Farmland in Rolling Terrain 

    Sun, Xia; Holmes, Heather A.; Osibanjo, Olabosipo O.; Sun, Yun; Ivey, Cesunica E. (2017)
    The partitioning of available energy into surface sensible and latent heat fluxes impacts the accuracy of simulated near surface temperature and humidity in numerical weather prediction models. This case study evaluates ...
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    Evolution of Multispectral Aerosol Absorption Properties in a Biogenically-Influenced Urban Environment during the CARES Campaign 

    Gyawali, Madhu S.; Arnott, W. Patrick; Zaveri, Rahul A.; Song, Chen; Flowers, Bradley; Dubey, Manvendra K.; Setyan, Ari; Zhang, Qi; China, Swarup; Mazzoleni, Claudio; Gorkowski, Kyle; Subramanian, R.; Moosmuller, Hans (2017)
    We present the evolution of multispectral optical properties through urban aerosols that have aged and interacted with biogenic emissions, resulting in stronger short wavelength absorption and the formation of moderately ...
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    Experimental platform for investigations of high-intensity laser plasma interactions in the magnetic field of a pulsed power generator 

    Ivanov, Vladimir V.; Maximov, A. V.; Swanson, K. J.; Wong, N. L.; Sarkisov, G. S.; Wiewior, P. P.; Astanovitskiy, A. L.; Covington, A. M. (2018)
    An experimental platform for the studying of high-intensity laser plasma interactions in strong magnetic fields has been developed based on the 1 MA Zebra pulsed power generator coupled with the 50-TW Leopard laser. The ...
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    Feasibility of an optical fiber clock 

    Ilinova, Ekaterina; Babb, James F.; Derevianko, Andrei (2017)
    We explore the feasibility of a fiber clock, i.e., a compact, high-precision, optical lattice atomic clock based on atoms trapped inside a hollow-core optical fiber. Such a setup offers an intriguing potential both for a ...
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    Forbidden M1 and E2 transitions in monovalent atoms and ions 

    Safronova, U. I.; Safronova, M. S.; Johnson, W. R. (2017)
    We carried out a systematic high-precision relativistic study of the forbidden magnetic dipole and electric quadrupole transitions in Ca+, Rb, Sr+, Cs, Ba+, Fr, Ra+, Ac2+, and Th3+. This work is motivated by the importance ...
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    Geometry and kinematics of the Grant Range brittle detachment system, eastern Nevada, USA: An end-member style of upper crustal extension 

    Long, Sean P.; Walker, Jerome P. (2015)
    Documenting the range of styles of normal faulting is fundamental to understanding crustal extension. Here geologic mapping, field relationships, and deformed and restored cross sections illustrate the geometry and kinematic ...
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    GIA Model Statistics for GRACE Hydrology, Cryosphere, and Ocean Science 

    Caron, L.; Ivins, E. R.; Larour, E.; Adhikari, S.; Nilsson, J.; Blewitt, G. (2018)
    We provide a new analysis of glacial isostatic adjustment (GIA) with the goal of assembling the model uncertainty statistics required for rigorously extracting trends in surface mass from the Gravity Recovery and Climate ...
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    Growth of ice particle mass and projected area during riming 

    Erfani, Ehsan; Mitchell, David L. (2017)
    There is a long-standing challenge in cloud and climate models to simulate the process of ice particle riming realistically, partly due to the unrealistic parameterization of the growth of ice particle mass (m) and projected ...
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    High-contrast laser acceleration of relativistic electrons in solid cone-wire targets 

    Higginson, D. P.; Link, A.; Sawada, H.; Wilks, S. C.; Bartal, T.; Chawla, S.; Chen, C. D.; Flippo, K. A.; Jarrott, L. C.; Key, M. H.; McLean, H. S.; Patel, P. K.; Perez, F.; Wei, M. S.; Beg, F. N. (2015)
    The consequences of small scale-length precursor plasmas on high-intensity laser-driven relativistic electrons are studied via experiments and simulations. Longer scale-length plasmas are shown to dramatically increase the ...
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    Hyperfine-induced quadrupole moments of alkali-metal-atom ground states and their implications for atomic clocks 

    Derevianko, Andrei (2016)
    Spherically symmetric ground states of alkali-metal atoms do not posses electric quadrupole moments. However, the hyperfine interaction between nuclear moments and atomic electrons distorts the spherical symmetry of ...
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    Imaging the He-2 quantum halo state using a free electron laser 

    Zeller, Stefan; Kunitski, Maksim; Voigtsberger, Joerg; Kalinin, Anton; Schottelius, Alexander; Schober, Carl; Waitz, Markus; Sann, Hendrik; Hartung, Alexander; Bauer, Tobias; Pitzer, Martin; Trinter, Florian; Goihl, Christoph; Janke, Christian; Richter, Martin; Kastirke, Gregor; Weller, Miriam; Czasch, Achim; Kitzler, Markus; Braune, Markus; Grisenti, Robert E.; Schoellkopf, Wieland; Schmidt, Lothar Ph H.; Schoefflera, Markus S.; Williams, Joshua B.; Jahnke, Till; Doerner, Reinhard (2016)
    Quantum tunneling is a ubiquitous phenomenon in nature and crucial for many technological applications. It allows quantum particles to reach regions in space which are energetically not accessible according to classical ...
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    Imaging the square of the correlated two-electron wave function of a hydrogen molecule 

    Waitz, M.; Bello, R. Y.; Metz, D.; Lower, J.; Trinter, F.; Schober, C.; Keiling, M.; Lenz, U.; Pitzer, Martin; Mertens, K.; Martins, M.; Viefhaus, J.; Klumpp, S.; Weber, T.; Schmidt, L. Ph H.; Williams, J. B.; Schoeffler, M. S.; Serov, V. V.; Kheifets, A. S.; Argenti, L.; Palacios, A.; Martin, F.; Jahnke, Till; Doerner, Reinhard (2017)
    The toolbox for imaging molecules is well-equipped today. Some techniques visualize the geometrical structure, others the electron density or electron orbitals. Molecules are many-body systems for which the correlation ...