Now showing items 568-587 of 977

    • Nanostructure and velocity of field-driven solid-on-solid interfaces moving under a phonon-assisted dynamic 

      Buendia, G. M.; Rikvold, P. A.; Kolesik, M.; Park, K.; Novotny, M. A. (American Physical Society, 2007-07)
      The nanoscopic structure and the stationary propagation velocity of (1+1)-dimensional solid-on-solid interfaces in an Ising lattice-gas model, which are driven far from equilibrium by an applied force, such as a magnetic ...
    • Nanotechnology: Nature's Gift or Scientists' Brainchild? 

      Hochella, Michael F., Jr.; Spencer, Michael G.; Jones, Kimberly L. (The Royal Society of Chemistry, 2014-12-02)
      In the field of environmental nanotechnology, opinions on the novelty of engineered nanomaterials vary; some scientists believe that many engineered nanomaterials are indeed unique, while others are convinced that we are ...
    • Natural history note - A novel terrestrial fish habitat inside emergent logs 

      Taylor, D. S.; Turner, B. J.; Davis, W. P.; Chapman, B. B. (University of Chicago Press, 2008-02)
      Reports of new habitats for a major group of organisms are rare. Fishes display diverse adaptations for temporary (amphibious) existence on land, but to our knowledge, none have ever been reported regularly living inside ...
    • Natural Law/ Human Law 

      Cairns, John (Virginia Tech, 2014-01-22)
      This commentary is a response to Cormac Cullinan s 2008 article in Orion. In the article, Cullinan writes, _In the eyes of American law today, most of the community of life on Earth remains mere property, natural «resources ...
    • Nature of the condensate in mass transport models 

      Majumdar, S. N.; Evans, M. R.; Zia, R. K. P. (American Physical Society, 2005-05-13)
      We study the phenomenon of real space condensation in the steady state of a class of one-dimensional mass transport models. We derive the criterion for the occurrence of a condensation transition and analyze the precise ...
    • Nature's Way: Quantity First, Quality Next 

      Cairns, John (Virginia Tech, 2014-01-22)
      In nature, each species produces a larger quantity of offspring than needed for replacement. From this larger quantity, nature selects quality, or the fittest individuals for the specific ecologic niche the species holds. ...
    • Neel temperature and thermodynamics of the half-filled three-dimensional Hubbard model by diagrammatic determinant Monte Carlo 

      Kozik, E.; Burovski, E.; Scarola, V. W.; Troyer, M. (American Physical Society, 2013-05-03)
      We study the thermodynamics of the three-dimensional Hubbard model at half filling on approach to the Neel transition by means of large-scale unbiased diagrammatic determinant Monte Carlo simulations. We obtain the transition ...
    • Network Topologies and Dynamics Leading to Endotoxin Tolerance and Priming in Innate Immune Cells 

      Fu, Yan; Glaros, Trevor; Zhu, Meng; Wang, Ping; Wu, Zhanghan; Tyson, John J.; Li, Liwu; Xing, Jianhua (Public Library of Science, 2012-05-05)
      The innate immune system, acting as the first line of host defense, senses and adapts to foreign challenges through complex intracellular and intercellular signaling networks. Endotoxin tolerance and priming elicited by ...
    • New Ediacara fossils preserved in marine limestone and their ecological implications 

      Chen, Z.; Zhou, C. M.; Xiao, S. H.; Wang, W.; Guan, C. G.; Hua, H.; Yuan, X. L. (Nature Publishing Group, 2014-02)
      Ediacara fossils are central to our understanding of animal evolution on the eve of the Cambrian explosion, because some of them likely represent stem-group marine animals. However, some of the iconic Ediacara fossils have ...
    • New phase in the one-dimensional t-J model 

      Chen, Y. C.; Lee, T. K. (American Physical Society, 1993-05)
      A new phase of a gas of pairs of electrons bounded in a singlet state is found in the one-dimensional t -J model for J > 2t and the density of electrons less than 0.2. This phase was conjectured in the study of the ...
    • New results in the theory of wetting transitions (invited) 

      Kroll, D. M. (American Institute of Physics, 1987-04-15)
      The aim of this contribution is to draw attention to some recent developments in the theory of wettingtransitions which may be of interest to the magnetism community. After presenting a qualitative discussion of wetting ...
    • nitrogen cycling in a forest stream determined by a n-15 tracer addition 

      Mulholland, P. J.; Tank, J. L.; Sanzone, D. M.; Wollheim, W. M.; Peterson, B. J.; Webster, J. R.; Meyer, J. L. (Ecological Society of America, 2000-08)
      Nitrogen uptake and cycling was examined using a six-week tracer addition of N-15-labeled ammonium in early spring in Walker Branch, a first-order deciduous forest stream in eastern Tennessee. Prior to the N-15 addition, ...
    • Nitrogen K-Shell Photoabsorption 

      Garcia, J.; Kallman, T. R.; Witthoeft, M.; Behar, E.; Mendoza, C.; Palmeri, P.; Quinet, P.; Bautista, M. A.; Klapisch, M. (IOP PUBLISHING LTD, 2009-12)
      Reliable atomic data have been computed for the spectral modeling of the nitrogen K lines, which may lead to useful astrophysical diagnostics. Data sets comprise valence and K-vacancy level energies, wavelengths, Einstein ...
    • nitrogen saturation in stream ecosystems 

      Earl, S. R.; Valett, H. M.; Webster, J. R. (Ecological Society of America, 2006-12)
      The concept of nitrogen (N) saturation has organized the assessment of N loading in terrestrial ecosystems. Here we extend the concept to lotic ecosystems by coupling Michaelis-Menten kinetics and nutrient spiraling. We ...
    • The Non-Pesticide Silent Spring 

      Cairns, John (Virginia Tech, 2014-01-22)
      This commentary was a result of John Cairns, Jr. witnessing the blocking of the US Senate resolution to honor Rachel Carson on what would have been her 100th birthday in 2007. When Carson s controversial book Silent Spring, ...
    • Noncanonical Reactions of Flavoenzymes 

      Sobrado, Pablo (MDPI, 2012-11-05)
      Enzymes containing flavin cofactors are predominantly involved in redox reactions in numerous cellular processes where the protein environment modulates the chemical reactivity of the flavin to either transfer one or two ...
    • Nonequilibrium Relaxation and Critical Aging for Driven Ising Lattice Gases 

      Daquila, G. L.; Tauber, U. C. (American Physical Society, 2012-03-13)
      We employ Monte Carlo simulations to study the nonequilibrium relaxation of driven Ising lattice gases in two dimensions. Whereas the temporal scaling of the density autocorrelation function in the nonequilibrium steady ...
    • Nonlinear current-induced forces in Si atomic wires 

      Yang, Z. Q.; Di Ventra, M. (American Physical Society, 2003-04)
      We report first-principles calculations of current-induced forces in Si atomic wires as a function of bias and wire length. We find that these forces are strongly nonlinear as a function of bias due to the competition ...
    • Nonlinear integral inequalities in two independent variables and their applications 

      Zheng, K.; Wu, Y.; Deng, S. F. (Hindawi Publishing Corporation, 2007)
      This paper generalizes results of Cheung and Ma (2005) to more general inequalities with more than one distinct nonlinear term. From our results, some results of Cheung and Ma ( 2005) can be deduced as some special cases. ...
    • Nonuniversal exponents in interface growth - Newman and Swift reply 

      Newman, T. J.; Swift, M. R. (American Physical Society, 1998-12-14)