Now showing items 87-106 of 911

  • 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 ...
  • 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 ...
  • 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 ...
  • Blood, Toil, Tears, and Sweat 

    Cairns, John (Asian Journal of Experimental Sciences, 2014-01-22)
    Some people alive in 1940 may remember a portion of the famous speech given on 13 May 1940 by Sir Winston Churchill to the British public. The speech was given during the dark days of World War II for the British when all ...
  • Blowing Sunshine #2: Transforming Inconvenient Truths to Convenient Truths 

    Cairns, John (Virginia Tech, 2014-01-22)
    Cairns has compiled a list of opportunities for Congress and other governmental entities to _blow sunshine at the efforts of scientists justifying global warming.
  • Blowing Sunshine #3: Transforming Inconvenient Truths to Convenient Truths 

    Cairns, John (Virginia Tech, 2014-01-22)
    The inconvenient truth of the matter is that an overwhelming majority of mainstream scientists accept the scientific evidence on global warming. Attempting to _blow sunshine on global warming is becoming increasingly ...