Now showing items 807-826 of 911

  • t-J model studied by the power Lanczos method 

    Chen, Y. C.; Lee, T. K. (American Physical Society, 1995-03)
    The initial trial wave function used in a simple ground-state projection method, the power method, is systematically improved by using Lanczos algorithm. Much faster convergence to the ground state achieved by using these ...
  • Taboos and Denials: Major Obstacles to Sustainable Use of the Planet 

    Cairns, John (Science and Society, 2014-01-22)
    A taboo is a (1) prohibition excluding something from use, approach, or mention because of its sacred and inviolable nature and (2) an object, work, or act protected by such a prohibition. Denial is a refusal to believe ...
  • Targeting folded RNA: A branched peptide boronic acid that binds to large surface area of HIV-1 RRE RNA 

    Zhang, Wenyu; Bryson, David I.; Crumpton, Jason B.; Wynn, Jessica; Santos, Webster L. (The Royal Society of Chemistry, 2013-08-02)
    On-bead high-throughput screening of a medium-sized (1000_2000 Da) branched peptideboronic acid (BPBA) library consisting of 46 656 unique sequences against HIV-1 RRE RNA generated peptides with binding affinities in the ...
  • Terrorist Attacks vs Cultural Suicide: Which Most Threatens Human Survival 

    Cairns, John (Asian Journal of Experimental Sciences, 2014-01-22)
    On September 11, 2001, terrorists commandeered four commercial airliners and crashed two into the Twin Towers of the World Trade Center in New York City; the third crashed into the Pentagon near Washington, DC; and, in the ...
  • testing a spatially explicit, individual-based model of red-cockaded woodpecker population dynamics 

    Schiegg, K.; Walters, J. R.; Priddy, J. A. (Ecological Society of America, 2005-10)
    Stochastic population models are widely used to assess extinction risk under various management scenarios, but due to the lack of independent data, such models are tested only rarely. Here we evaluate the predictive accuracy ...
  • Texture and structural refinement using neutron diffraction data from molybdite (MoO3) and calcite (CaCO3) powders and a Ni-rich Ni50.7Ti49.30 alloy 

    Sitepu, H. (Cambridge University Press, 2009-12)
    Preferred orientation or texture is a common feature of experimental powder patterns. The mathematics of two commonly used models for preferred orientation-the March-Dollase and the generalized spherical-harmonic models-is ...
  • the complex physics of dusty star-forming galaxies at high redshifts as revealed by herschel and spitzer 

    Lo Faro, B.; Franceschini, A.; Vaccari, M.; Silva, L.; Rodighiero, G.; Berta, S.; Bock, J.; Burgarella, D.; Buat, V.; Cava, A.; Clements, D. L.; Cooray, A.; Farrah, D.; Feltre, A.; Solares, E. A. G.; Hurley, P.; Lutz, D.; Magdis, G.; Magnelli, B.; Marchetti, L.; Oliver, S. J.; Page, M. J.; Popesso, P.; Pozzi, F.; Rigopoulou, D.; Rowan-Robinson, M.; Roseboom, I. G.; Scott, D.; Smith, A. J.; Symeonidis, M.; Wang, L.; Wuyts, S. (IOP Publishing Ltd., 2013-01)
    We combine far-infrared photometry from Herschel (PEP/HerMES) with deep mid-infrared spectroscopy from Spitzer to investigate the nature and the mass assembly history of a sample of 31 luminous and ultraluminous infrared ...
  • The Contribution Of Galactic Free-Free Emission to Anisotropies in the Cosmic Microwave Background Found by the Saskatoon Experiment 

    Simonetti, J. H.; Dennison, B.; Topasna, G. A. (IOP PUBLISHING LTD, 1996-02)
    We made a sensitive, wide-field Ha image of the north celestial polar region. Using this image, we constrain the contribution of irregularities in interstellar free-free emission to the degree-scale anisotropies in the ...
  • The dual role of floral traits: Pollinator attraction and plant defense 

    Irwin, R. E.; Adler, L. S.; Brody, A. K. (Ecological Society of America, 2004-06)
    Plants are under siege from a diversity of enemies that consume both leaf and floral parts. Plants resist damage to leaves in a variety of ways, and we now have a rich literature documenting how plants defend themselves ...
  • the ecophysiological significance of leaf movements in rhododendron-maximum 

    Bao, Y. J.; Nilsen, E. T. (Ecological Society of America, 1988-10)
    The patterns of leaf movements and their environmental stimuli have been documented for over a century. Although there have been several studies on the physiological significance of heliotropisms, thermotropic movements ...
  • The effect of insoluble surfactant at dilute concentration on drop breakup under shear with inertia 

    M. A. Drumright-Clarke; Y. Renardy (American Institute of Physics, 2004-01)
    Direct numerical simulations are conducted with a volume-of-fluid continuous surface stress algorithm. The linear equation of state is used to characterize the effects of an insoluble surfactant at low concentration on a ...
  • The effect of negative feedback loops on the dynamics of Boolean networks 

    Sontag, E.; Veliz-Cuba, A.; Laubenbacher, R.; Jarrahy, A. S. (CELL PRESS, 2008-07)
    Feedback loops play an important role in determining the dynamics of biological networks. To study the role of negative feedback loops, this article introduces the notion of distance-to-positive-feedback which, in essence, ...
  • The evolution of the dust and gas content in galaxies 

    Santini, P.; Maiolino, R.; Magnelli, B.; Lutz, D.; Lamastra, A.; Causi, G. L.; Eales, S.; Andreani, P.; Berta, S.; Buat, V.; Cooray, A.; Cresci, G.; Daddi, E.; Farrah, D.; Fontana, A.; Franceschini, A.; Genzel, R.; Granato, G.; Grazian, A.; Le Floc'h, E.; Magdis, G.; Magliocchetti, M.; Mannucci, F.; Menci, N.; Nordon, R.; Oliver, S.; Popesso, P.; Pozzi, F.; Riguccini, L.; Rodighiero, G.; Rosario, D. J.; Salvato, M.; Scott, D.; Silva, L.; Tacconi, L.; Viero, M.; Wang, L.; Wuyts, S.; Xu, K. (EDP SCIENCES, 2014-02)
    We use deep Herschel observations taken with both PACS and SPIRE imaging cameras to estimate the dust mass of a sample of galaxies extracted from the GOODS-S, GOODS-N and the COSMOS fields. We divide the redshift-stellar ...
  • The Extreme Scattering Event toward PKS 1741-038: VLBI Images 

    Lazio, T. J. W.; Fey, A. L.; Dennison, B.; Mantovani, F.; Simonetti, J. H.; Alberdi, A.; Foley, A. R.; Fiedler, R.; Garrett, M. A.; Hirabayashi, H.; Jauncey, D. L.; Johnston, K. J.; Marcaide, J.; Migenes, V.; Nicolson, G. D.; Venturi, T. (IOP PUBLISHING LTD, 2000-05)
    We report multiepoch VLBI observations of the source PKS 1741-038 (OT 068) as it underwent an extreme scattering event (ESE). Observations at four epochs were obtained, and images were produced at three of these. One of ...
  • The field high-amplitude SX Phe variable BL Cam: results from a multisite photometric campaign 

    Fauvaud, S.; Sareyan, J. P.; Ribas, I.; Rodriguez, E.; Lampens, P.; Klingenberg, G.; Farrell, J. A.; Fumagalli, F.; Simonetti, J. H.; Wolf, M.; Santacana, G.; Zhou, A. Y.; Michel, R.; Fox-Machado, L.; Alvarez, M.; Nava-Vega, A.; Lopez-Gonzalez, M. J.; Casanova, V. M.; Aceituno, F. J.; Scheggia, I.; Rives, J. J.; Hintz, E. G.; Van Cauteren, P.; Helvaci, M.; Yesilyaprak, C.; Graham, K. A.; Kral, L.; Kocian, R.; Kucakova, H.; Fauvaud, M.; Granslo, B. H.; Michelet, J.; Nicholson, M. P.; Vugnon, J. M.; Kotkova, L.; Truparova, K.; Ulusoy, C.; Yasarsoy, B.; Avdibegovic, A.; Blazek, M.; Kliner, J.; Zasche, P.; Bartosikova, S.; Vilasek, M.; Trondal, O.; Van Den Abbeel, F.; Behrend, R.; Wucher, H. (EDP SCIENCES, 2010-06)
    Context. Short-period high-amplitude pulsating stars of Population I (delta Sct stars) and II (SX Phe variables) exist in the lower part of the classical (Cepheid) instability strip. Most of them have very simple pulsational ...
  • The field high-amplitude SX Phoenicis variable BL Camelopardalis: results from a multisite photometric campaign 

    Rodriguez, E.; Fauvaud, S.; Farrell, J. A.; Zhou, A. Y.; Sareyan, J. P.; Lopez-Gonzalez, M. J.; Dupret, M. A.; Grigahcene, A.; de Ridder, J.; Klingenberg, G.; Wolf, M.; Van Cauteren, P.; Lampens, P.; Martinez, D.; Casanova, V. M.; Aceituno, F. J.; Helvaci, M.; Hintz, E. G.; Kral, L.; Fumagalli, F.; Simonetti, J. H.; Granslo, B. H.; Kotkova, L.; Santacana, G.; Michelet, J.; Fauvaud, M.; Vugnon, J. M.; Sadsaoud, H.; Aliouane, A.; Grigahcene, Z. C.; Martin-Ruiz, S.; Amado, P. J.; Suarez, J. C.; Moya, A.; Kucakova, H.; Kocian, R.; Truparova, B.; Avdibegtovic, A.; Blazek, M.; Kliner, J.; Zasche, P.; Vilasek, M.; Bartosikova, S.; Yasarsoy, B.; Ulusoy, C.; Graham, K. A.; Nicholson, M. P.; Trondal, O.; Yesilyaprak, C.; Coker, D. (EDP SCIENCES, 2007-08)
    Context. BL Cam is an extreme metal-deficient field high-amplitude SX Phe-type variable where a very complex frequency spectrum is detected, with a number of independent nonradial modes excited, unusual among the high-amplitude ...
  • the half-Hartley and the half-Hilbert transform 

    Paverifontana, S. L.; Zweifel, P. F. (AIP Publishing, 1994-05)
    Inversion formulas are obtained for the restrictions of the Hartley and Hilbert transforms to R+. Regularity results are derived, and an illustrative example presented.
  • The influence of self-absorption on the photoluminescence of thin film CdS demonstrated by two-photon absorption 

    Ullrich, B.; Schroeder, R.; Graupner, W.; Sakai, H. (Optical Society of America, 2001-07)
    By means of two-photon excited photoluminescence, we demonstrate the influence of self-absorption on the emission properties of thin (1.5 mum) film CdS formed by laser ablation. The excitation of the sample is performed ...
  • The land-cover cascade: Relationships coupling land and water 

    Burcher, C. L.; Valett, H. M.; Benfield, E. F. (Ecological Society of America, 2007-01)
    We introduce the land-cover cascade ( LCC) as a conceptual framework to quantify the transfer of land-cover-disturbance effects to stream biota. We hypothesize that disturbance is propagated through multivariate systems ...
  • the nuclear spectroscopic telescope array (nuSTAR) high-energy x-ray mission 

    Harrison, F. A.; Craig, W. W.; Christensen, F. E.; Hailey, C. J.; Zhang, W. W.; Boggs, S. E.; Stern, D.; Cook, W. R.; Forster, K.; Giommi, P.; Grefenstette, B. W.; Kim, Y.; Kitaguchi, T.; Koglin, J. E.; Madsen, K. K.; Mao, P. H.; Miyasaka, H.; Mori, K.; Perri, M.; Pivovaroff, M. J.; Puccetti, S.; Rana, V. R.; Westergaard, N. J.; Willis, J.; Zoglauer, A.; An, H. J.; Bachetti, M.; Barriere, N. M.; Bellm, E. C.; Bhalerao, V.; Brejnholt, N. F.; Fuerst, F.; Liebe, C. C.; Markwardt, C. B.; Nynka, M.; Vogel, J. K.; Walton, D. J.; Wik, D. R.; Alexander, D. M.; Cominsky, L. R.; Hornschemeier, A. E.; Hornstrup, A.; Kaspi, V. M.; Madejski, G. M.; Matt, G.; Molendi, S.; Smith, D. M.; Tomsick, J. A.; Ajello, M.; Ballantyne, D. R.; Balokovic, M.; Barret, D.; Bauer, F. E.; Blandford, R. D.; Brandt, W. N.; Brenneman, L. W.; Chiang, J.; Chakrabarty, D.; Chenevez, J.; Comastri, A.; Dufour, F.; Elvis, M.; Fabian, A. C.; Farrah, D.; Fryer, C. L.; Gotthelf, E. V.; Grindlay, J. E.; Helfand, D. J.; Krivonos, R.; Meier, D. L.; Miller, J. M.; Natalucci, L.; Ogle, P.; Ofek, E. O.; Ptak, A.; Reynolds, S. P.; Rigby, J. R.; Tagliaferri, G.; Thorsett, S. E.; Treister, E.; Urry, C. M. (IOP Publishing Ltd., 2013-06)
    The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates in the band from 3 to 79 keV, extending the sensitivity of ...