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Author: jack douglas

Displaying records 51 to 60 of 222 records.
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51. Does Equilibrium Polymerization Describe the Dynamic Heterogeneity of Glass-Forming Liquids?
Published: 10/13/2006
Authors: Jack F Douglas, J Dudowicz, Karl Freed
Abstract: We examine whether the `dynamic heterogeneities' of glass-forming liquids can be described by equilibrium polymerization. This correspondence is first checked by demonstrating a resemblance between the T dependence of the configurational entropy s in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852631

52. Characterization of Atomic Motions Governing Grain Boundary Migration
Published: 9/24/2006
Authors: Hao Zhang, David J Srolovitz, Jack F Douglas, James A Warren
Abstract: Molecular dynamics simulations were employed to study atomic motion within stationary and migrating asymmetric tilt grain boundaries. We employ several measures of the complexity of the atomic trajectories, including the van Hove correlation funct ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853448

53. A Hybrid Finite Element-Analytical Method For Determining the Intrinsic Elastic Moduli of Particles Having Moderately Extended Shapes and a Wide Rande of Elastic Properties
Published: 8/1/2006
Authors: Edward Joseph Garboczi, Jack F Douglas, Howard Hung
Abstract: The presence of a low (dilute) concentration of paniculate inclusions having any shape and any property mismatch with the matrix in which they are placed, influences the elasticity of the resulting composite material. This influence is via the intrin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906700

54. Polycrystalline Patterns in Far-From-Equilibrium Freezing: A Phase Field Study
Published: 8/1/2006
Authors: L Granasy, T Pusztai, T Borzsonyi, G Toth, G - Tegze, James A Warren, Jack F Douglas
Abstract: We discuss the formation of polycrystalline microstructures with the framework of phase field theory. First, the model is tested for crystal nucleation in a hard sphere system. It is shown that, when evaluating the model parameters from molecular d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853376

55. Influence of Confinement on the Fragility of Antiplasticized and Pure Polymer Films
Published: 7/27/2006
Authors: Robert A Riggleman, K Yoshimoto, Jack F Douglas, J J de Pablo
Abstract: We investigate by molecular dynamics simulation how thin film confinementmodifies the fragility of a model glass-forming liquid characterized previously in the bulk. Film confinement is found to reduce the relative fragility of the polymer fluid, le ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852594

56. Nature of the Breakdown in the Stokes-Einstein Relationship in a Hard Sphere Fluid
Published: 6/1/2006
Authors: S K Kumar, Grzegorz Szamel, Jack F Douglas
Abstract: Molecular Dynamics simulations of high density hard sphere fluids clearly show a breakdown of the Stokes-Einstein equation (SE). This result has been conjectured to be due to the presence of mobile particles, i.e., ones which have the propensity to ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852555

57. Lattice Model of Equilibrium Polymerization: V. Scattering Properties and the Width of the Critical Regime for Phase Separation
Published: 4/1/2006
Authors: Kyunil Rah, Karl Freed, J Dudowicz, Jack F Douglas
Abstract: Dynamic clustering associated with self-assembly in many complex fluids can qualitatively alter the shape of their phase boundaries and produce large changes in the scale of critical fluctuations that are difficult to comprehend within the existing c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852576

58. Symmetry, Equivalence and Molecular Self-Organization
Published: 3/1/2006
Authors: K Van Workum, Jack F Douglas
Abstract: Abstract: Self-organization is central to the formation of numerous biological structures and the emulation of this process through the creation of synthetic counterparts offers great promise for nanofabrication. Our approach to understanding the pri ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852484

59. Entropy Theory of Polymer Glass-Formation Revisited. II. Influence of Mass, Pressure, and Size of Side Groups and Similarities to Equilibrium Polymerization
Published: 2/8/2006
Authors: J Dudowicz, Karl Freed, Jack F Douglas
Abstract: Recent measurements reveal striking trends in the variation of fragility (the strength of the temperature dependence of the fluid viscosity) of glass-forming polymer liquids with monomer structure and pressure. The elucidation of the physical origin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852487

60. Dielectric Study of the Anti-Plasticization of Trehalose by Glycerol
Published: 1/1/2006
Authors: A Anopchenko, Tatiana Psurek, David Lloyd VanderHart, Jack F Douglas, Jan Obrzut
Abstract: Recent measurements have suggested that the antiplasticizing effect of glycerol on trehalose can significantly increase the preservation times of proteins stored in this type of preservative formulation. In order to better understand the physical ori ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852572



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