Now showing items 6-25 of 2261

  • A Cellular Automata Approach to Estimate Incident-Related Travel Time on Interstate 66 in Near Real Time 

    Zhuojin Wang; Pamela M. Murray-Tuite (Virginia Center for Transportation Innovation and Research, 2010-03)
    Incidents account for a large portion of all congestion and a need clearly exists for tools to predict and estimate incident effects. This study examined (1) congestion back propagation to estimate the length of the queue ...
  • A closed-form method for calculating the angular distribution of multiply scattered photons through isotropic turbid slabs 

    Sun, X. Q.; Li, X. S.; Ma, L. (Optical Society of America, 2011-11)
    This paper develops a method for calculating the angular distribution (AD) of multiply scattered photons through isotropic turbid slabs. Extension to anisotropic scattering is also discussed. Previous studies have recognized ...
  • A comparison of SuperDARN ACF fitting methods 

    A. J. Ribeiro; J. M. Ruohoniemi; P. V. Ponomarenko; L. B. N. Clausen; J. B. H. Baker; R. A. Greenwald; K. Oksavik; S. de Larquier (American Geophysical Union, 2013-05)
    The Super Dual Auroral Radar Network (SuperDARN) is a worldwide chain of HF radars which monitor plasma dynamics in the ionosphere. Autocorrelation functions are routinely calculated from the radar returns and applied to ...
  • A computational study of nucleosomal DNA flexibility 

    Ruscio, J. Z.; Onufriev, A. (CELL PRESS, 2006-12)
    Molecular dynamics simulations of the nucleosome core particle and its isolated DNA free in solution are reported. The simulations are based on the implicit solvent methodology and provide insights into the nature of ...
  • A conceptual model of the sense of presence in virtual environments 

    Bystrom, K. E.; Barfield, W.; Hendrix, C. (MIT Press, 1999-04)
    This paper proposes a model of interaction in virtual environments which we term the immersion, presence, performance (IPP) model. This model is based on previous models of immersion and presence proposed by Barfield and ...
  • A correlation force spectrometer for single molecule measurements under tensile load 

    Radiom, Milad; Honig, Christopher D. F.; Walz, John Y.; Paul, Mark R.; Ducker, William A. (American Institute of Physics, 2013-01-07)
    The dynamical-mechanical properties of a small region of fluid can be measured using two closely spaced thermally stimulated micrometer-scale cantilevers. We call this technique correlation force spectroscopy (CFS). We ...
  • A diffusion-viscous analysis and experimental verification of defect formation in sintered silver bond-line 

    Xiao, K.; Ngo, K. D. T.; Lu, G. Q. (Cambridge University Press, 2014-04)
    The low-temperature joining technique (LTJT) by silver sintering is being implemented by major manufacturers of power electronic devices and modules for bonding power semiconductor chips. A common die-attach material used ...
  • A kinetic formulation of 3-dimensional quantum mechanical harmonic-oscillator under a random perturbation 

    Besieris, I. M.; Stasiak, W. B.; Tappert, F. D. (AIP Publishing, 1978-02)
    The behavior of a three_dimensional, nonrelativistic, quantum mechanical harmonic oscillator is investigated under the influence of three distinct types of randomly fluctuating potential fields. Specifically, kinetic (or ...
  • A longitudinal-longitudinal mode TERFENOL-D/Pb(Mg1/3Nb2/3)O-3-PbTiO3 laminate composite 

    Dong, S. X.; Li, J. F.; Viehland, D. (AIP Publishing, 2004-11)
    We have found that laminates of longitudinally magnetized magnetostrictive TERFENOL-D layersand a longitudinally poled piezoelectric Pb(Mg1/3Nb2/3)O-3-PbTiO3 crystal have a giant magnetoelectric voltage coefficient of >430 ...
  • A Markov process model of ocean sediments 

    Sockell, Michael; Besieris, Ioannis M.; Kohler, Werner E.; Freese, Herbert (Acoustical Society of America, 1985-01)
    Monochromatic plane-wave illumination of a randomly stratified, laterally homogeneous sediment layer is considered. The deposition process creating the stochastic layering is assumed to be a continuous parameter, finite ...
  • A new characterization method for delay and power dissipation of standard library cells 

    Sulistyo, J. B.; Ha, D. S. (Hindawi Publishing Corporation, 2002-11)
    A simplified method for characterization of standard library cells based on the linear delay model is presented in this paper. The linear model is chosen as it allows rapid characterization with a modest number of simulations, ...
  • A note on the energy of relative equilibria of point vortices 

    H. Aref (American Institute of Physics, 2007-10)
    Analytical formulas are derived for the energy of simple relative equilibria of identical point vortices such as the regular polygons, both open and centered, and the various known configurations consisting of nested regular ...
  • A piezoelectric bistable plate for nonlinear broadband energy harvesting 

    Arrieta, A. F.; Hagedorn, P.; Erturk, A.; Inman, D. J. (AIP Publishing, 2010-09)
    Recently, the idea of using nonlinearity to enhance the performance of vibration-based energy harvesters has been investigated. Nonlinear energy harvesting devices have been shown to be capable of operating over wider ...
  • A piezoelectric single crystal traveling wave step motor for low-temperature application 

    Dong, S. X.; Yan, L.; Viehland, D.; Jiang, X. N.; Hackenberger, W. S. (AIP Publishing, 2008-04)
    A piezoelectric Pb(Mg(1/3)Nb(2/3))O(3)-PbTiO(3) single crystal traveling wave rotary motor operated in a stepping motion for cryogenic actuations was developed and characterized. This single crystal stepping motor had a ...
  • A piezomagnetoelastic structure for broadband vibration energy harvesting 

    Erturk, A.; Hoffmann, J.; Inman, D. J. (AIP Publishing, 2009-06)
    This letter introduces a piezomagnetoelastic device for substantial enhancement of piezoelectric power generation in vibration energy harvesting. Electromechanical equations describing the nonlinear system are given along ...
  • A pressure gauge based on gas density measurement from analysis of the thermal noise of an atomic force microscope cantilever 

    Seo, Dongjin; Paul, Mark R.; Ducker, William A. (AIP Publishing, 2012-05)
    We describe a gas-density gauge based on the analysis of the thermally-driven fluctuations of an atomic force microscope (AFM) cantilever. The fluctuations are modeled as a ring-down of a simple harmonic oscillator, which ...
  • A purge and trap integrated microGC platform for chemical identification in aqueous samples 

    Akbar, Muhammad; Narayanan, Shree; Restaino, Michael; Agah, Masoud (The Royal Society of Chemistry, 2014-05-19)
    The majority of current micro-scale gas chromatography (_GC) systems focus on air sampling to detect volatile organic compounds (VOCs). However, purging the VOCs from a water sample using microsystems is an unchartered ...
  • A realistic radar data simulator for the Super Dual Auroral Radar Network 

    A. J. Ribeiro; P. V. Ponomarenko; J. M. Ruohoniemi; J. B. H. Baker; L. B. N. Clausen; R. A. Greenwald; S. de larquier (American Geophysical Union, 2013-05)
    The Super Dual Auroral Radar Network (SuperDARN) is a chain of HF radars for monitoring plasma flows in the high and middle latitude E and F regions of the ionosphere. The targets of SuperDARN radars are plasma irregularities ...
  • a simple model for the average local entrainment rate 

    Dancey, C. L. (AIP Publishing, 1986-07)
    A new expression for the mean local entrainment rate in a turbulent intermittent flow is obtained. This expression is used to obtain a simple model for the entrainment rate assuming that an indicator function can be defined ...
  • A small, linear, piezoelectric ultrasonic cryomotor 

    Dong, S. X.; Yan, L.; Wang, N. G.; Viehland, D.; Jiang, X. N.; Rehrig, P.; Hackenberger, W. (AIP Publishing, 2005-01)
    A small, linear-type, piezoelectric ultrasonic cryomotor has been developed for precision positioning at extremely low temperatures (greater than or equal to-200 degreesC). This cryornotor consists of a pair of ...