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POLYMER MODEL [3 records]

Record 1 2011-02-08

English

Subject field(s)
  • Rheology
DEF

A fluid described by the two-parameter rheological model of a pseudoplastic fluid, or a fluid whose viscosity decreases as shear rate increases.

OBS

Water-base polymer muds, especially those made with XC polymer, fit the power-law mathematical equation better than the Bingham plastic or any other two-parameter model.

French

Domaine(s)
  • Rhéologie
CONT

[...] considérons que la pâte se déforme comme un fluide en loi de puissance [...]

CONT

Étendue au cas du fluide loi de puissance isotherme, la modélisation permet en outre de considérer l'effet du caractère rhéofluidifiant (shear thinning) et d'appréhender les raisons profondes de l'intérêt de cette technique pour la fabrication de composites à base de caoutchouc.

Spanish

Save record 1

Record 2 2009-09-18

English

Subject field(s)
  • Computer Mathematics
  • Atomic Physics
CONT

We present a new Monte Carlo lattice model to study the folding of two-dimensional heteropolymer chains. Previous lattice model studies of two-dimensional chains have been performed on square grids using predefined "move sets" of allowed moves. The motion of the polymer chain in these models is thus highly constrained. To add greater flexibility, we use a triangular lattice and allow the chain to choose its own moves. Physically unrealistic moves are prevented by including kinetic energy effects in the Metropolis algorithm. From the results, we can characterize all of the possible one-and two-monomer moves and sort them according to relative importance. Greater flexibility in the lattice model produces several significant and interesting physical consequences.

French

Domaine(s)
  • Mathématiques informatiques
  • Physique atomique
CONT

Aperçu sur les méthodes de modélisation [...] Monte Carlo sur réseau : la diffusion des atomes par mécanisme lacunaire est décrite par des sauts atomiques discrets plutôt que par des trajectoires continues comme dans le cas de la dynamique moléculaire. Les fréquences des sauts des atomes sont déterminées par des calculs ab initio ou par la dynamique moléculaire. Cette simulation est relativement lente et ne prend pas en compte les déplacements collectifs.

Spanish

Save record 2

Record 3 1988-06-02

English

Subject field(s)
  • Metallurgy - General
  • Mining Operations
OBS

Subject-test CANMET-METALLURGY

French

Domaine(s)
  • Métallurgie générale
  • Exploitation minière

Spanish

Save record 3

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