Results 261 to 270 of about 31,845 (302)

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 ...
Rogerio Pinto Alexandre, Adriano Wagner Ballarin   +1 more
exaly   +2 more sources

Application of Leeb Hardness Test in Prediction of Dynamic Elastic Constants of Sedimentary and Igneous Rocks

Geotechnical and Geological Engineering, 2022
The Leeb hardness test is a non-destructive and portable technique that can be used both in the laboratory and in-field applications. The main purpose of this study is to predict the dynamic elastic constants of the igneous and sedimentary rocks using ...
Sasan Ghorbani, Seyed Hadi Hoseinie, Ebrahim Ghasemi   +2 more
exaly   +3 more sources

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
Ghatu Subhash, Abhijit Chandra, Subhash G   +2 more
exaly   +2 more sources

Dynamic Hardness Evolution in Metals from Impact Induced Gradient Dislocation Density

Acta Materialia, 2023
A clear understanding of the dynamic behavior of metals is critical for developing superior structural materials as well as for improving material processing techniques such as cold spray and shot peening.
Jizhe Cai, Claire Grießbach, Ramathasan Thevamaran   +2 more
exaly   +2 more sources

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Dynamics of hard-sphere suspensions

Physical Review E, 1994
A 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
openaire   +2 more sources

Metapopulation Dynamics of Hard Corals

2006
This 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
openaire   +3 more sources

Brownian dynamics of hard spherocylinders

Physical Review E, 1994
A 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
openaire   +2 more sources

Dynamical correlations in Brownian hard rods

The Journal of Chemical Physics, 2006
We 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
openaire   +2 more sources

Dynamical properties of hard-sphere suspensions

Physical Review A, 1992
We 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
openaire   +2 more sources

Dynamic equivalences in the hard-sphere dynamic universality class

Physical Review E, 2013
We 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, Honorina, Ruíz-Estrada, Martín, Chávez-Páez, Magdaleno, Medina-Noyola   +3 more
openaire   +2 more sources