2,258 research outputs found
Magic numbers in the discrete tomography of cyclotomic model sets
We report recent progress in the problem of distinguishing convex subsets of
cyclotomic model sets by (discrete parallel) X-rays in prescribed
-directions. It turns out that for any of these model sets
there exists a `magic number' such that any two
convex subsets of can be distinguished by their X-rays in any set
of prescribed -directions. In particular, for
pentagonal, octagonal, decagonal and dodecagonal model sets, the least possible
numbers are in that very order 11, 9, 11 and 13.Comment: 6 pages, 1 figure; based on the results of arXiv:1101.4149 [math.MG];
presented at Aperiodic 2012 (Cairns, Australia
Discrete Tomography of Penrose Model Sets
Various theoretical and algorithmic aspects of inverse problems in discrete
tomography of planar Penrose model sets are discussed. These are motivated by
the demand of materials science for the reconstruction of quasicrystalline
structures from a small number of images produced by quantitative high
resolution transmission electron microscopy.Comment: 7 pages, 1 figure; paper presented at Aperiodic 2006 (Zao, Japan
Silvia Curtis Mayorga, Plaintiff, v. Alorica, Inc., d/b/a P.R.C. LLC a/k/a Precision Response Corp., Defendant.
Handbook for Computerized Reliability Analysis Method /CRAM/
Method for analyzing reliability by use of computer
Performance and evaluation of the Viking lander camera performance prediction program
A computer program is described for predicting the performance of the Viking lander cameras. The predictions are primarily concerned with two objectives: (1) the picture quality of a reference test chart (of which there are three on each lander) to aid in diagnosing camera performance; and (2) the picture quality of cones with surface properties of a natural terrain to aid in predicting favorable illumination and viewing geometries and operational camera commands. Predictions made with this program are verified by experimental data obtained with a Viking-like laboratory facsimile camera
An analysis of the facsimile-camera response to radiant point sources
In addition to imaging the surrounding terrain, planetary lander cameras may also be used to survey the stars to aid in locating the lander site. The response of the facsimile camera, which was selected for the Viking lander missions to Mars, to a radiant point source is formulated and shown to result in a statistical rather than deterministic signal. The signal statistics are derived and magnitudes are evaluated for the brighter visual and red stars. The probability of detecting the resultant statistical signals in photosensor and preamplifier noise and the associated probability of false alarms are also determined
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