Now showing items 645-664 of 1009

    • Pair contact process with diffusion: Failure of master equation field theory 

      Janssen, H. K.; van Wijland, F.; Deloubriere, O.; Tauber, U. C. (American Physical Society, 2004-11)
      We demonstrate that the "microscopic" field theory representation, directly derived from the corresponding master equation, fails to adequately capture the continuous nonequilibrium phase transition of the pair contact ...
    • Parallel Evolution of Tetrodotoxin Resistance in Three Voltage-Gated Sodium Channel Genes in the Garter Snake Thamnophis sirtalis 

      McGlothlin, Joel W.; Chuckalovcak, John P.; Janes, Daniel E.; Edwards, Scott V.; Feldman, Chris R.; Brodie, Edmund D.; Pfrender, Michael E.; Brodie, Edmund D. (Oxford University Press, 2014-08-18)
      Members of a gene family expressed in a single species often experience common selection pressures. Consequently, the molecular basis of complex adaptations may be expected to involve parallel evolutionary changes in ...
    • partnership for research & education in plants (prep): involving high school students in authentic research in collaboration with scientists 

      Brooks, E.; Dolan, E.; Tax, F. (University of California Press, 2011-03)
      A partnership between scientists, high school teachers, and their students provides authentic research experiences to help students understand the nature and processes of science. The Partnership for Research and Education ...
    • Passive range estimation using subarray parallax 

      Hinich, Melvin J. (Acoustical Society of America, 1979-05)
      Consider a large aperture linear array which is detecting coherent radiation from a source. Suppose that the array is processed as a string of subarrays consisting of adjacent sensors. Assume that the signal is a plane ...
    • Path-integral approach to the Hubbard model 

      Weng, Z. Y.; Ting, C. S.; Lee, T. K. (American Physical Society, 1991-02)
      A path-integral approach to the Hubbard model is developed for the whole range of the coupling strength U. At half filling, the strong-coupling results are readily reproduced within the simple Gaussian fluctuations. The ...
    • pattern-recognition with wavelength-multiplexed filters 

      Case, S. K. (Optical Society of America, 1979-08)
      Wavelength-multiplexed matched spatial filters are used in an incoherent optical pattern recognition system. The system produces color-coded correlation responses which allow the simultaneous recognition of several objects ...
    • patterns in soil fertility and root herbivory interact to influence fine-root dynamics 

      Stevens, G. N.; Jones, R. H. (Ecological Society of America, 2006-03)
      Fine-scale soil nutrient enrichment typically stimulates root growth, but it may also increase root herbivory, resulting in trade-offs for plant species and potentially influencing carbon cycling patterns. We used root ...
    • patterns of coexistence in synaptomys cooperi and microtus pennsylvanicus 

      Linzey, A. V. (Ecological Society of America, 1984)
      The microtine rodents Synaptomys cooperi and Microtus pennsylvanicus are sympatric, have a similar life styles, and occur in the same general habitats. The object of this study was to determine the importance of competition ...
    • Peace, Global Warming, Ecological Overshoot, and Resource Wars 

      Cairns, John (Virginia Tech, 2014-01-22)
      In addition to the usual threats to world peace, a number of other destabilizing factors affect human society: global warming, ecological overshoot, and resource wars. These factors are interactive and often have positive ...
    • Peptide-based hydrogen sulphide-releasing gels 

      Carter, Jennifer M.; Qian, Yun; Foster, Jeffrey C.; Matson, John B. (The Royal Society of Chemistry, 2015-07-20)
      An aromatic peptide amphiphile was designed for delivery of the signaling gas H2S. The peptide self-assembled in water into nanofibers that gelled upon charge screening. The non-toxic gel slowly released H2S over 15 hours, ...
    • Percolation-enhanced supersolids in the extended Bose-Hubbard model 

      Kemburi, B. M.; Scarola, V. W. (American Physical Society, 2012-01-04)
      We theoretically study the stability of lattice supersolid states in the extended Bose-Hubbard model with bounded spatial disorder. We construct a disorder mean-field theory and compare with quantum Monte Carlo calculations. ...
    • Performance of the Los Alamos National Laboratory spallation-driven solid-deuterium ultra-cold neutron source 

      Saunders, A.; Makela, M.; Bagdasarova, Y.; Back, H. O.; Boissevain, J.; Broussard, L. J.; Bowles, T. J.; Carr, R.; Currie, S. A.; Filippone, B.; Garcia, A.; Geltenbort, P.; Hickerson, K. P.; Hill, R. E.; Hoagland, J.; Hoedl, S.; Holley, A. T.; Hogan, G.; Ito, T. M.; Lamoreaux, Steve; Liu, Chen-Yu; Liu, J.; Mammei, R. R.; Martin, J.; Melconian, D.; Mendenhall, M. P.; Morris, C. L.; Mortensen, R. N.; Pattie, R. W., Jr.; Pitt, M.; Plaster, B.; Ramsey, J.; Rios, R.; Sallaska, A.; Seestrom, S. J.; Sharapov, E. I.; Sjue, S.; Sondheim, W. E.; Teasdale, W.; Young, A. R.; VornDick, B.; Vogelaar, R. B.; Wang, Z.; Xu, Yanping (AIP Publishing, 2013-01)
      In this paper, we describe the performance of the Los Alamos spallation-driven solid-deuterium ultra-cold neutron (UCN) source. Measurements of the cold neutron flux, the very low energy neutron production rate, and the ...
    • Phantom Land and Ghost Slave: Humankind's Addiction to Fossil Energy 

      Cairns, John (Asian Journal of Experimental Sciences, 2014-01-22)
      Humankind uses vast amounts of fossil energy accumulated millions of years ago. The rate of use is many orders of magnitude greater than the replacement rate. Peak oil is the most immediate problem, and replacing this rate ...
    • Phase-locked loops, demodulation, and averaging approximation time-scale extensions 

      Chicone, C.; Heitzman, M. T. (Siam Publications, 2013)
      Among the many applications of the phase-locked loop (PLL), a device used extensively in telecommunications and electronics, is the demodulation of modulated carrier signals. The PLL contains a voltage controlled oscillator ...
    • Phenomenology of aging in the Kardar-Parisi-Zhang equation 

      Henkel, M.; Noh, J. D.; Pleimling, M. (American Physical Society, 2012-03-27)
      We study aging during surface growth processes described by the one-dimensional Kardar-Parisi-Zhang equation. Starting from a flat initial state, the systems undergo simple aging in both correlators and linear responses, ...
    • Phosphonium-containing diblock copolymers from living anionic polymerization of 4-diphenylphosphino styrene 

      Schultz, Alison R.; Fahs, Gregory B.; Jangu, Chainika; Chen, Mingtao; Moore, Robert B.; Long, Timothy E. (The Royal Society of Chemistry, 2015-11-20)
      Living anionic polymerization of 4-diphenylphosphino styrene (DPPS) achieved well-defined homopolymers, poly(DPPS-b-S) styrenic block copolymers, and poly(I-b-DPPS) diene-based diblock copolymers with predictable molecular ...
    • phosphorus spiraling in a woodland stream: seasonal-variations 

      Mulholland, P. J.; Newbold, J. D.; Elwood, J. W.; Ferren, L. A.; Webster, J. R. (Ecological Society of America, 1985)
      Four radiotracer releases were performed over an annual period in 1981-1982 to determine seasonal variation in indices and pathways of phosphorus spiralling in Walker Branch, a small woodland stream in eastern Tennessee, ...
    • Phosphorylation of PPARγ Affects the Collective Motions of the PPARγ-RXRα-DNA Complex 

      Lemkul, Justin A.; Lewis, Stephanie N.; Bassaganya-Riera, Josep; Bevan, David R. (Public Library of Science, 2015-05-08)
      Peroxisome-proliferator activated receptor-γ (PPARγ) is a nuclear hormone receptor that forms a heterodimeric complex with retinoid X receptor-α (RXRα) to regulate transcription of genes involved in fatty acid storage and ...
    • Photogeneration action spectroscopy of neutral and charged excitations in films of a ladder-type poly(para-phenylene) 

      Wohlgenannt, M.; Graupner, W.; Leising, G.; Vardeny, Z. V. (American Physical Society, 1999-04-19)
      The photogeneration quantum efficiency action spectra of long-lived neutral and charged excitations in films of a ladder-type poly(para-phenylene) were measured. We found that both tripler and polaron action spectra show, ...
    • Photogeneration and recombination processes of neutral and charged excitations in films of a ladder-type poly(para-phenylene) 

      Wohlgenannt, M.; Graupner, W.; Leising, G.; Vardeny, Z. V. (American Physical Society, 1999-08-15)
      We introduce a version of the cw photomodulation technique, measured far from the steady state, for obtaining the quantum efficiency, eta, of long-lived photoexcitations in pi-conjugated polymers. We apply this technique ...