Results 241 to 250 of about 586,659 (284)
Some of the next articles are maybe not open access.
The shape of grains in a polycrystal
Metallography, 1969The distribution of the shape of grains in a fully annealed polycrystal is found to resemble that of their size, and to be governed by similar laws.
D.A. Aboav, T.G. Langdon
openaire +1 more source
On the shapes of natural sand grains
Journal of Geophysical Research: Solid Earth, 2009Digitized outlines of sand grains from a dozen locations, including deserts, beaches, and seabeds, have been acquired using an optical microscope linked to a desktop computer. Fourier analysis of the outlines returns the normalized power spectrum of each sample, averaged over several hundred grains.
David R. Barclay, Michael J. Buckingham
openaire +1 more source
Synthesizing the shape of sand grains.
The Journal of the Acoustical Society of America, 2009Digitized outlines of sand grains from a dozen locations have been acquired using an optical microscope. A Fourier decomposition of the outline is calculated providing a spectral description of the grain’s shape. By averaging over several hundred grains, the normalized power spectrum of each sand sample is returned.
David R. Barclay, Michael J. Buckingham
openaire +1 more source
Grain shape, grain boundary mobility and the Herring relation
Acta Materialia, 2004Abstract Motivated by recent experiments on grain boundary migration in Al, we examine the question: does interface mobility depend on the nature of the driving force? We investigate this question in the Ising model and conclude that the answer is “no.” This conclusion highlights the importance of including the second derivative of the interface ...
A.E Lobkovsky +4 more
openaire +1 more source
Effects of film growth kinetics on grain coarsening and grain shape
Physical Review E, 2017We study models of grain nucleation and coarsening during the deposition of a thin film using numerical simulations and scaling approaches. The incorporation of new particles in the film is determined by lattice growth models in three different universality classes, with no effect of the grain structure.
openaire +2 more sources
Automated grain shape analysis
Journal of Structural Geology, 1986Abstract A computer programme is used to identify grain boundaries from an image digitized using a transmitted light, X—Y recording microdensitometer. For each grain the following parameters are computed: area, length of the long dimension and the width at right angles to it, the location of the center of gravity, perimeter length and the orientation
Sandra Simigian, John Starkey
openaire +1 more source
A Hydrodynamic Classification of Grain Shapes
Journal of Sedimentary Research, 2004ABSTRACT The relationship between the fall velocity and orthogonal axis ratios of differently shaped grains with stable settling patterns is examined. Contrary to what is generally supposed, the ratio of the intermediate to the long diameter Di/Dl, which is related to the maximum projection area normal to the direction of settling, appears to have the ...
openaire +1 more source
Grain shapes in quenched uranium
Journal of Nuclear Materials, 1961Abstract Details are given of some experiments on the grain shapes and sizes produced in two grades of uranium, one with and one without small solute additions, after quenching from temperatures in the range of the β and γ phases. A tentative theory of the grain shapes produced by β-quenching these materials is put forward.
B.R. Butcher +3 more
openaire +1 more source
Shape of grain size distributions during crystal grain nucleation in a-Si
Thin Solid Films, 1999The solid phase crystallization of chemical vapor deposited amorphous silicon films onto oxidized silicon wafers, induced by rapid thermal annealing has been extensively investigated. The morphological evolution of the amorphous towards the polycrystalline phase is investigated by transmission electron microscopy and it is interpreted in terms of a ...
C Spinella, S Lombardo, F Priolo
openaire +2 more sources
Maize grain shape approaches for DEM modelling
Computers and Electronics in Agriculture, 2015Display Omitted The shape of a grain of maize was approached using the multi-sphere method.Models with single-spherical particles and with rolling friction were also used.Results from two DEM software codes were compared.Recommendations on the shape approach for DEM modelling were provided.
Darius Markauskas +3 more
openaire +1 more source