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Related Concept Videos

Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
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Design Example: Aggregate Gradation01:24

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The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Published on: November 22, 2021

Effective force coarse-graining.

Yanting Wang1, W G Noid, Pu Liu

  • 1Center for Biophysical Modeling and Simulation and Department of Chemistry, University of Utah, 315 S. 1400 E., Rm. 2020, Salt Lake City, Utah 84112-0850, USA.

Physical Chemistry Chemical Physics : PCCP
|March 13, 2009
PubMed
Summary
This summary is machine-generated.

A new effective force coarse-graining (EF-CG) method offers improved transferability for force fields by averaging atomistic forces. This method is ideal for large, symmetric molecules and complex systems across various conditions.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Molecular Dynamics

Background:

  • Multiscale coarse-graining (MS-CG) is a powerful technique for simulating large systems.
  • Developing accurate and transferable coarse-grained (CG) force fields remains a challenge.
  • Existing methods may struggle with reproducing structural properties accurately.

Purpose of the Study:

  • To introduce and validate the effective force coarse-graining (EF-CG) method.
  • To provide an alternative to MS-CG for CG force field development.
  • To explore the trade-offs between transferability and structural accuracy in CG methods.

Main Methods:

  • Developed the EF-CG method by averaging atomistic forces from equilibrium simulations.
  • Compared EF-CG with the general MS-CG methodology.
  • Applied the EF-CG method to neopentane, methanol, and ionic liquid systems.

Main Results:

  • EF-CG successfully extracts transferable components of the MS-CG force field.
  • The method demonstrates improved transferability at the expense of reduced structural accuracy.
  • Numerical examples show the utility of EF-CG for specific molecular systems.

Conclusions:

  • EF-CG is a valuable alternative for developing CG force fields, particularly for large, symmetric molecules.
  • The method offers enhanced transferability across different thermodynamic conditions.
  • Understanding the limitations and connections to MS-CG is crucial for its application.