spatstat.data (version 1.4-0)

bronzefilter: Bronze gradient filter data

Description

These data represent a spatially inhomogeneous pattern of circular section profiles of particles, observed in a longitudinal plane section through a gradient sinter filter made from bronze powder, prepared by Ricardo Bernhardt, Dresden.

The material was produced by sedimentation of bronze powder with varying grain diameter and subsequent sintering, as described in Bernhardt et al. (1997).

The data are supplied as a marked point pattern of circle centres marked by circle radii. The coordinates of the centres and the radii are recorded in mm. The field of view is an \(18 \times 7\) mm rectangle.

The data were first analysed by Hahn et al. (1999).

Usage

data(bronzefilter)

Format

An object of class "ppp" representing the point pattern of cell locations. Entries include

x	Cartesian \(x\)-coordinate of bronze grain profile centre
y	Cartesian \(y\)-coordinate of bronze grain profile centre

See ppp.object for details of the format. All coordinates are recorded in mm.

References

Bernhardt, R., Meyer-Olbersleben, F. and Kieback, B. (1997) Fundamental investigation on the preparation of gradient structures by sedimentation of different powder fractions under gravity. Proc. of the 4th Int. Conf. On Composite Engineering, July 6--12 1997, ICCE/4, Hawaii, Ed. David Hui, 147--148.

Hahn U., Micheletti, A., Pohlink, R., Stoyan D. and Wendrock, H.(1999) Stereological analysis and modelling of gradient structures. Journal of Microscopy, 195, 113--124.

Examples

# NOT RUN {
  data(bronzefilter)
  if(require(spatstat)) {
  plot(bronzefilter, markscale=2)
  }
# }