Publications by authors named "N De Keyser"
, one of the most famous masterpieces by Rembrandt, is the subject of a large research and conservation project. For the conservation treatment, it is of great importance to understand its current condition. Correlated nano-tomography using x-ray fluorescence and ptychography revealed a-so far unknown-lead-containing "layer", which likely acts as a protective impregnation layer applied on the canvas before the quartz-clay ground was applied.
View Article and Find Full Text PDFArticle Synopsis
- Artist pigments can degrade over time, altering both the appearance of artworks and the artist's original intent.
- The article uses a still life painting by A. Mignon as a case study to explore the visual effects of degradation on a yellow rose.
- Advanced imaging techniques, like MA-XRPD and x-ray fluorescence, revealed how degradation products impacted the painting’s light-shadow modeling, highlighting changes caused by lead arsenates and fading pigments.
The use of noninvasive chemical imaging techniques is becoming more widespread for the study of cultural heritage artifacts. Recently a mobile instrument for macroscopic X-ray powder diffraction (MA-XRPD) scanning was developed, which is capable of visualizing the distribution of crystalline (pigment) phases in quasi-flat-painted artifacts. In this study, MA-XRPD is used in both transmission and reflection mode for the analysis of three 17th century still life paintings, two paintings by Jan Davidsz.
View Article and Find Full Text PDFObjective: To evaluate the effect of a weight-gain restriction programme for obese pregnant women on sickness absence days and pregnancy benefit days during pregnancy and postpartum.
Design: A prospective, controlled intervention study. The Swedish Social Security Agency's records were utilized to compile sickness absence and pregnancy benefit information.
Objective: To perform a cost comparison of a weight gain restriction programme for obese pregnant women with standard antenatal care, and to identify if there were differences in healthcare costs within the intervention group related to degree of gestational weight gain or degree of obesity at programme entry.
Study Design: A comparison of mean healthcare costs for participants of an intervention study at antenatal care clinics with controls in south-east Sweden.
Methods: In total, 155 women in an intervention group attempted to restrict their gestational weight gain to <7 kg.