Now showing items 101-120 of 1077

    • Background independent quantum mechanics and gravity 

      Minic, D.; Tze, C. H. (American Physical Society, 2003-09-15)
      We argue that the demand of background independence in a quantum theory of gravity calls for an extension of standard geometric quantum mechanics. We discuss a possible kinematical and dynamical generalization of the latter ...
    • BAL outflow contribution to AGN feedback: frequency of S IV outflows in the SDSS 

      Dunn, J. P.; Arav, N.; Aoki, K.; Wilkins, A.; Laughlin, C.; Edmonds, D.; Bautista, M. (IOP Publishing Ltd., 2012-05)
      We present a study of broad absorption line (BAL) quasar outflows that show S IV lambda 1063 and S IV* lambda 1073 troughs. The fractional abundances of S IV and C IV peak at similar value of the ionization parameter, ...
    • BAL phosphorus abundance and evidence for immense ionic column densities in quasar outflows: vlt/x-shooter observations of quasar SDSS J1512+1119 

      Borguet, B. C. J.; Edmonds, D.; Arav, N.; Benn, C.; Chamberlain, C. (IOP Publishing Ltd., 2012-10)
      We present spectroscopic analysis of the broad absorption line (BAL) outflow in quasar SDSS J1512+1119. In particular, we focus our attention on a kinematic component in which we identify P V and S IV/S IV* absorption ...
    • Bayesian estimation of genetic parameters for multivariate threshold and continuous phenotypes and molecular genetic data in simulated horse populations using Gibbs sampling 

      Stock, Kathrin F; Distl, Ottmar; Hoeschele, Ina (2007-05-09)
      Abstract Background Requirements for successful implementation of multivariate animal threshold models including phenotypic and genotypic information are not known yet. Here simulated horse data were used to investigate ...
    • Bayesian QTL mapping using skewed Student-tdistributions 

      von Rohr, Peter; Hoeschele, Ina (2002-01-15)
      Abstract In most QTL mapping studies, phenotypes are assumed to follow normal distributions. Deviations from this assumption may lead to detection of false positive QTL. To improve the robustness of Bayesian QTL mapping ...
    • Beamforming when the sound velocity is not precisely known 

      Hinich, Melvin J. (Acoustical Society of America, 1980-08)
      Beamforming is an integral part of most signal processingsystems in active or passive sonars. The delays used to generate a beam are functions of the sound velocity, which depends on temperature, salinity, and pressure. ...
    • Bearing estimation using a large towed array 

      Hinich, Melvin J.; Rule, William (Acoustical Society of America, 1975)
      When a towed array of hydrophones is significantly nonlinear due to bending, ordinary linear array beamforming gives a biased estimate of the true source bearing. By processing the array as a sequence of smaller aperture ...
    • Bearing estimation using a perturbed linear array 

      Hinich, Melvin J. (Acoustical Society of America, 1977-06)
      A linear hydrophone array which is towed in the ocean is subject to snakelike bending. If the array is processed as if it was truly linear, the author has shown that the bending causes a deflection of the measured bearing ...
    • Bell's Inequalities, Superquantum Correlations, and String Theory 

      Chang, L. N.; Lewis, Z.; Minic, D.; Takeuchi, T.; Tze, C. H. (Hindawi Publishing Corporation, 2011)
      We offer an interpretation of superquantum correlations in terms of a "doubly" quantum theory. We argue that string theory, viewed as a quantum theory with two deformation parameters, the string tension alpha', and the ...
    • between-year breeding dispersal in red-cockaded woodpeckers: multiple causes and estimated cost 

      Daniels, S. J.; Walters, J. R. (Ecological Society of America, 2000-09)
      We studied between-year dispersal of adult females within a population of cooperatively breeding Red-cockaded Woodpeckers (Picoides borealis) in the Sandhills of North Carolina, using data collected between 1980 and 1995. ...
    • Beyond Ecocentrism 

      Cairns, John (EcoRes Forum, 2014-01-22)
      In order to avoid further damage to the ecosystems, we must promote ecological health as the primary goal, which will require at least two steps beyond ecocentrism. First, one must regard the relationship between humankind ...
    • bifurcation analysis of a model of the budding yeast cell cycle 

      Battogtokh, D.; Tyson, J. J. (AIP Publishing, 2004-09)
      We study the bifurcations of a set of nine nonlinear ordinary differential equations that describe regulation of the cyclin-dependent kinase that triggers DNA synthesis and mitosis in the budding yeast, Saccharomyces ...
    • Biochemical Characterization of a Dihydroneopterin Aldolase Used for Methanopterin Biosynthesis in Methanogens 

      Wang, Yu; Xu, Huimin; Grochowski, Laura L.; White, Robert H. (American Society for Microbiology, 2014-06-30)
      The gene encoding 7,8-dihydroneopterin aldolase (DHNA) was recently identified in archaea through comparative genomics as being involved in methanopterin biosynthesis (V. Crecy-Lagard, G. Phillips, L. L. Grochowski, B. El ...
    • biological integrity: a long-neglected aspect of water resource management 

      Karr, J. R. (Ecological Society of America, 1991-02)
      Water of sufficient quality and quantity is critical to all life. Increasing human population and growth of technology require human society to devote more and more attention to protection of adequate supplies of water. ...
    • The Biosphere Life Support System: A Unifying Concept for Ecotoxicologists and Ecologists 

      Cairns, John (Society of Environmental Toxicology and Chemistry, 2014-01-22)
      The biospheric life support system, consisting of natural capital and the ecosystem services it provides, has maintained favorable condition for humankind. Therefore, maintaining the health and integrity of the biospheric ...
    • Biospheric Changes are Threat Multipliers 

      Cairns, John (National Academy of Sciences, 2014-01-22)
      A threat multiplier is defined as another agent that impacts a current situation, creating an additional set of problems while also making existing problems worse. Sometimes a seemingly innocent change in the biosphere ...
    • Biospheric Feedback Loops and Rapid Global Climate Change 

      Cairns, John (National Academy of Sciences, 2014-01-22)
      A positive feedback loop makes an existing process speed up while a negative feedback loop decreases the impact of an existing process. A source emits carbon dioxide and other greenhouse gases while a sink retain and stores. ...
    • Biospheric Health and Integrity: The Top Priority for Humankind 

      Cairns, John (National Academy of Sciences, 2014-01-22)
      All life on Earth depends on the biospheric life support system to provide both natural capital, or resources, and ecosystem services. Why, then, is the human economy, a subset of the biosphere, given the highest priority ...
    • Bis[bis(pentamethylcyclopentadienyl)cobalt(III)] tetrachloridocobaltate(II) dichloromethane disolvate 

      Merola, Joseph S.; Ngo, Mai; Karpin, George W. (International Union of Crystallography, 2013-08-17)
      The title compound, [Co(C10H15)2]2[CoCl4]·2CH2Cl2, was isolated as a dichloromethane solvate and was formed in the reaction between lithium pentamethylcyclopentadienide and anyhydrous cobalt(II) chloride in tetrahydrofuran. ...
    • Bistability in an Ising model with non-Hamiltonian dynamics 

      Heringa, J. R.; Shinkai, H.; Blote, H. W. J.; Hoogland, A.; Zia, R. K. P. (American Physical Society, 1992-03)
      We investigate the phenomenon of magnetization bistability in a two-dimensional Ising model with a non-Hamiltonian Glauber dynamics by means of Monte Carlo simulations. This effect has previously been observed in the Toom ...