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Author |
Cabal Rodríguez, A.E.; Leyva Pernia, D.; Schalm, O.; van Espen, P.J.M. |
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Title |
Possibilities of energy-resolved X-ray radiography for the investigation of paintings |
Type |
A1 Journal article |
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Year  |
2012 |
Publication |
Analytical and bioanalytical chemistry |
Abbreviated Journal |
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Volume |
402 |
Issue |
4 |
Pages |
1471-1480 |
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Keywords |
A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
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Abstract |
X-ray radiographic images of paintings often show little or no contrast. In order to increase the contrast in radiographic images we measured the X-ray spectrum of a low power X-ray tube, after passing through the painting, with a high energy-resolution SDD detector. To obtain images, the detector is collimated with a 400 mu m diameter pinhole and the painting was moved through the beam in the x and y-direction using a dwell time of a few seconds per pixel. The data obtained consists of a data cube of, typically, 200 x 200 pixels and a 512-channel X-ray spectrum for each pixel, spanning the energy range from 0 to 40 keV. Having the absorbance spectrum available for each pixel, we are able, a posteriori, to produce images by edge subtraction for any given element. In this way high contrast, element-specific, images can be obtained. Because of the high energy-resolution a much simpler edge subtraction algorithm can be applied. We also used principal-component imaging to obtain, in a more automated way, images with high contrast. Some of these images can easily be attributed to specific elements. It turns out that preprocessing of the spectral data is crucial for the success of the multivariate image processing. |
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Wos |
000299842000008 |
Publication Date |
2011-07-14 |
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Edition |
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ISSN |
1618-2642; 1618-2650 |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
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no |
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Call Number |
UA @ admin @ c:irua:96200 |
Serial |
8394 |
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Author |
Serneels, S.; Faber, K.; Verdonck, T.; van Espen, P.J. |
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Title |
Case specific prediction intervals for tri-PLS1 : the full local linearisation |
Type |
A1 Journal article |
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Year |
2011 |
Publication |
Chemometrics and intelligent laboratory systems |
Abbreviated Journal |
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Volume |
108 |
Issue |
2 |
Pages |
93-99 |
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Keywords |
A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
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Abstract |
A new method to estimate case specific prediction uncertainty for univariate trilinear partial least squares (tri-PLS1) regression is introduced. This method is, from a theoretical point of view, the most exact finite sample approximation to true prediction uncertainty that has been reported up till now. Using the new method, different error sources can be propagated, which is an advantage that cannot be offered by data driven approaches such as the bootstrap. In a concise example, it is illustrated how the method can be applied. In the Appendix, efficient algorithms are presented to compute the estimates required. |
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Wos |
000295310000002 |
Publication Date |
2011-05-12 |
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Series Issue |
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Edition |
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ISSN |
0169-7439; 1873-3239 |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
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no |
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Call Number |
UA @ admin @ c:irua:92788 |
Serial |
7580 |
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Author |
Gregory, C.L.; Nullens, H.A.; Gijbels, R.H.; van Espen, P.J.; Geuens, I.; de Keyzer, R. |
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Title |
Automated particle analysis of populations of silver halide microcrystals by electron probe microanalysis under cryogenic conditions |
Type |
A1 Journal article |
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Year |
1998 |
Publication |
Analytical chemistry |
Abbreviated Journal |
Anal Chem |
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Volume |
70 |
Issue |
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Pages |
2551-2559 |
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Keywords |
A1 Journal article; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT); Chemometrics (Mitac 3) |
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Washington, D.C. |
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Wos |
000074584700047 |
Publication Date |
2002-07-26 |
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ISSN |
0003-2700;1520-6882; |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
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Impact Factor |
6.32 |
Times cited |
12 |
Open Access |
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Notes |
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Approved |
Most recent IF: 6.32; 1998 IF: 4.580 |
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Call Number |
UA @ lucian @ c:irua:21308 |
Serial |
210 |
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Author |
Kindratenko, V.V.; van Espen, P.J.M.; Treiger, B.A.; Van Grieken, R.E. |
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Title |
Fractal dimensional classification of aerosol particles by computer-controlled scanning electron microscopy |
Type |
A1 Journal article |
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Year |
1994 |
Publication |
Environmental science and technology |
Abbreviated Journal |
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Volume |
28 |
Issue |
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Pages |
2197-2202 |
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Keywords |
A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation); Chemometrics (Mitac 3) |
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Wos |
A1994PP82900033 |
Publication Date |
2007-05-30 |
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ISSN |
0013-936x; 1520-5851 |
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UA library record; WoS full record; WoS citing articles |
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Notes |
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no |
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Call Number |
UA @ admin @ c:irua:9497 |
Serial |
7983 |
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Author |
Eltayeb, M.A.H.; van Espen, P.J.; Cafmeyer, J.; Van Grieken, R.E.; Maenhaut, W. |
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Title |
Size-differentiated composition of aerosols in Khartoum, Sudan |
Type |
A1 Journal article |
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Year |
1992 |
Publication |
The science of the total environment |
Abbreviated Journal |
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Volume |
120 |
Issue |
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Pages |
281-299 |
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Keywords |
A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation); Chemometrics (Mitac 3) |
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Abstract |
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Wos |
A1992JA65200008 |
Publication Date |
2003-09-12 |
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Abbreviated Series Title |
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ISSN |
0048-9697; 1879-1026 |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
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Open Access |
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Notes |
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no |
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Call Number |
UA @ admin @ c:irua:2834 |
Serial |
8543 |
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