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A New Rock Hardness Classification System Based on Portable Dynamic Testing [PDF]
Bulletin of Engineering Geology and the Environment, 2022 Hardness is one of the critical physical characteristics of minerals and rocks, which indicates the resistance of the rock to penetration, scratch, or permanent deformation.
Ebrahim Ghasemi +2 more
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Dynamic Hardness of Wood – Measurements With an Automated Portable Hardness Tester
Holzforschung, 2017 A research group on forest products from School of Agriculture - Sao Paulo State University. Brazil developed a portable hardness tester for wood, which is based on a displacement transducer and an embedded electronic processor for dynamic evaluation of ...
Adriano W Ballarin +2 more
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Dynamic Indentation Hardness and Rate Sensitivity in Metals
Journal of Engineering Materials and Technology, Transactions of the ASME, 1999 An experimental technique for determining the dynamic indentation hardness of materials is described. Unlike the traditional static hardness measurements, the dynamic hardness measurements can capture the inherent rate dependent material response that is
Abhijit Chandra, Ghatu Subhash
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Dynamics of hard-sphere suspensions
Physical Review E, 1994A systematic theory for the dynamics of concentrated hard-sphere suspensions of interacting Brownian particles with both hydrodynamic and direct interactions is presented. An alternative equation for the number density of particles is derived. The volume-fraction dependence of the short- and long-time self-diffusion coefficients is thus explored from a
, Tokuyama, , Oppenheim
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Metapopulation Dynamics of Hard Corals
2006This chapter describes a prototypic, spatially structured model for hard corals and their main competitor, macroalgae. Hard corals certainly form spatially structured populations, but whether they form true metapopulations is less clear. A classic metapopulation envisages a large array of habitat patches that are either occupied by a population or not.
Mumby, Peter J., Dytham, Calvin
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Brownian dynamics of hard spherocylinders
Physical Review E, 1994A model of hard spherocylinders exhibiting Brownian dynamics in a solvent is investigated by Brownian dynamics simulations. Long-time translational and rotational self-diffusion coefficients are calculated in the disordered phase over the whole range of densities and a ratio p of total length to width ranging from 1 to 6. A simple analytical formula is
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Dynamical correlations in Brownian hard rods
The Journal of Chemical Physics, 2006We analyze the time decay of small amplitude density perturbations in systems of highly packed Brownian hard rods, relaxing towards a uniform density distribution. The results of Brownian dynamics simulations and those of the deterministic dynamic density functional (DDF) theory, are contrasted with a new theoretical approach beyond the DDF assumptions.
F, Penna, P, Tarazona
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Dynamical properties of hard-sphere suspensions
Physical Review A, 1992We present an alternative approach to the calculation of long-time diffusion coefficients of dense suspensions. The main idea is to approximate friction coefficients rather than the diffusion coefficients. Within this scheme we derive a very simple yet accurate theory of dynamic properties of a hard-sphere suspension: to calculate friction coefficients
, Leegwater, , Szamel
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Dynamic equivalences in the hard-sphere dynamic universality class
Physical Review E, 2013We perform systematic simulation experiments on model systems with soft-sphere repulsive interactions to test the predicted dynamic equivalence between soft-sphere liquids with similar static structure. For this we compare the simulated dynamics (mean squared displacement, intermediate scattering function, α-relaxation time, etc.) of different soft ...
Leticia, López-Flores +3 more
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