HUTNICTWO, GÓRNICTWO ›
INŻYNIERIA MATERIAŁOWA ›
2008-4 |
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3D segmentation and analysis of macroporous alumino-silicate
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MAXIME MOREAUD  BENOIT CELSE TIHAY FANNY
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We present a method for the segmentation and analysis of a macroporous
alumino-silicate. This catalytic material is used for instance in petroleum
industries for the conversion of heavy crude oil. The efficiency of such
catalysts is strongly linked to their texture. To analyze itsmorphology, we use
three-dimensional transmission electron microscopy (3D-TEM) images. These
images allow 3D infor[...]
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3D segmentation of metallic particles using nanotomography: a comparison approach
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The purpose of this study is to compare several images processing
techniques in order to characterize metallic particles analyzed by 3D nanotomography.
Particles can have several shapes (cubes, MTP, rods, ...). It is
well known that this kind of images is very noisy and with bad resolution
especially in the z axis (because rotation angle during tilt is only between -70°
and 70°).
A lot of te[...]
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A random Weaire-Phelan foam
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CLAUDIA LAUTENSACK TETYANA SYCH
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A representation of the Weaire-Phelan foam as a Laguerre (weighted
Voronoi) tessellation is presented. Using this representation, randomly
perturbed versions of the model are generated. Distributions of their cell
characteristics are studied and compared to values observed in real foams.
Keywords: foam model, Laguerre tessellation, random tessellation, Weaire-
Phelan foam.
STRESZCZENIE
Prze[...]
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Coating Zn formation during hot dip galvanizing
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DARIUSZ KOPYCIŃSKI EDWARD GUZIK WALDEMAR WOŁCZYŃSKI
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The studies aimed at an analysis of the formation and growth kinetics of
zinc coating on reactive silicon-killed steels in a zinc bath. The growth kinetics
of the produced zinc coatings was evaluated basing on the power-law growth
equation. As regards galvanizing of the surface of products, investigation was
done for various steel grades and ductile iron taking into account the quality
and th[...]
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Detecting surfaces of minimal cut - a graph theoretical approach
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ZBISŁAW TABOR
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In the study an algorithm localizing surfaces of minimal cuts within graylevel
volumetric images of porous structures is introduced. A two-stage
algorithm consists of identifying the typical intensity, corresponding to the
background (void) phase and then finding an optimal cut in a properly
constructed graph. It is conjectured that the minimal cut surface can provide
information about the re[...]
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Estimation of intrinsic volumes via parallel sets in plane and space
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TOMÁŠ MRKVIČKA
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A new method of estimation of intrinsic volumes densities for a stationary
random closed set Ξ in Rd with values in the extended convex ring is
introduced. The local Steiner formula is applied to the closure of the
complement of the parallel set to Ξ for n>d different radii and, by solving a
linear regression model, estimates of the intrinsic volume densities of the
parallel set are[...]
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Quantifying fabric from gray-level images
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ZBISŁAW TABOR
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In the study performance of binary-image-based and gray-image-based
methods of quantifying structural anisotropy of porous structures are
compared. High-resolution images of a porous structures (trabecular bone) are
obtained. Next simulation of CT scanning is performed to obtain noisy, lowresolution
representations of high-resolution structures. Structural anisotropy is
quantified with the us[...]
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Quantitative description of the "fish eyes" type hydrogen embrittlement in steels for power industry
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"Fish eyes" are special defect, which can be observed on fracture surface,
provoked by increased hydrogen content in steels. These defects represented
more or less circular areas of quasiclivage fracture initiated on non-metallic
inclusions (Fig. 2-7). The paper presents results of studies concerning the
mechanical (Tab. 2) and fractographical (Fig. 8-13) investigations of S500Q
and A516Gr.70[...]
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Scheil-Schwartz-Saltykov method in the matrix depiction
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EDYTA GŁOWACZ ANDRZEJ CZARSKI
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Stereological description of dispersed microstructure is not an easy problem
and is constantly a subject of research [1, 2]. From the practical point of view,
the stereological description of this type of microstructures is essential in
analyses of such processes as coarsening, spheroidization or in research of
relationship between microstructure and properties (e.g. bearing steel).
One of th[...]
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Stereological description of HAp + ZrO2 powders in ceramic composites
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AGATA DUDEK CEZARY KOLAN
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A variety of advantages of implants which are composed of hydroxyapatites
results, among other factors, from the level of their porosity. There are also
attempts made to improve poor mechanical properties of HAp coatings
through e.g. introduction of solid solution of Y2O3 in ZrO2 [1-12].
The investigations encompassed compositions of ceramic powders on the
basis of HAp+ZrO2 with addition of 8[...]
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Stereology of ultrafine-grained materials
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IVAN SAXL LUCIA ILUCOVÁ ANNA KALOUSOVÁ
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First a historical excursion calls attention to the fact that important
stereological relations were already proposed by J.-É. Barbier in the second
half of the XIXth century. Then the attractive metallographic electron
backscatter diffraction (EBSD) method is used to describe the effect of the
number N of passes on the subgrain and grain structure of pure aluminium
processed by equal channel[...]
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The influence of long-term annealing on the microstructure of Elektron 21 magnesium alloy
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Elektron 21 is a new magnesium based casting alloy for used to 200°C. The
microstructural changes after long-term annealing at 520°C (2÷48 h) and
350°C (500÷5000 h) have been presented. For the microstructure observation,
a OLYMPUS GX71 metallographic microscope and a HITACHI S-3400N
scanning electron microscope were used. Quantitative examination was
conducted using the Met-Ilo automatic ima[...]
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